firehol/sbin/firehol.in

#!/bin/bash
#
# FireHOL - A firewall for humans...
#
#   Copyright
#
#       Copyright (C) 2003-2014 Costa Tsaousis <costa@tsaousis.gr>
#       Copyright (C) 2012-2014 Phil Whineray <phil@sanewall.org>
#
#   License
#
#       This program is free software; you can redistribute it and/or modify
#       it under the terms of the GNU General Public License as published by
#       the Free Software Foundation; either version 2 of the License, or
#       (at your option) any later version.
#
#       This program is distributed in the hope that it will be useful,
#       but WITHOUT ANY WARRANTY; without even the implied warranty of
#       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
#       GNU General Public License for more details.
#
#       You should have received a copy of the GNU General Public License
#       along with this program. If not, see <http://www.gnu.org/licenses/>.
#
#       See the file COPYING for details.
#

get_version() {
	GIT_REF='$Format:%d,commit-%h$'
	local IFS=":(), "
	set -- "$GIT_REF"
	ver='$Id$'
	for i in $@
	do
		case "$i" in
			*[0-9].[0.9]*)
				echo "$i" | sed -e 's/^v//'
				return 0
			;;
			commit-[0-9a-zA-Z]*)
				ver="$i"
			;;
		esac
	done
	echo "$ver"
	return 0
}
VERSION=$(get_version)

if [ "$FIREHOL_DEBUGGING" ]; then set -v; set -x; fi

emit_version() {
	${CAT_CMD} <<EOF

FireHOL $VERSION
(C) Copyright 2003-2014 Costa Tsaousis <costa@tsaousis.gr>
(C) Copyright 2012-2014 Phil Whineray <phil@firehol.org>
FireHOL is distributed under the GPL v2+.
Home Page: http://firehol.org

-------------------------------------------------------------------------
Get notified of new FireHOL releases by subscribing to the mailing list:
    http://lists.firehol.org/mailman/listinfo/firehol-support/
-------------------------------------------------------------------------

EOF
}

# Make sure only root can run us.
if [ ! "${UID}" = 0 ]
then
	echo >&2
	echo >&2
	echo >&2 "Only user root can run FireHOL."
	echo >&2
	exit 1
fi

# Remember who you are.
FIREHOL_FILE="${0}"
declare -a FIREHOL_ORIGINAL_ARGS=("${@}")
FIREHOL_DEFAULT_WORKING_DIRECTORY="${PWD}"

# Make sure we don't get localized results
export LC_ALL=C

# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# GLOBAL DEFAULTS
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

# --- BEGIN OF FIREHOL DEFAULTS ---

# These are the defaults for FireHOL.
# You can set everything system-wide here, or set any or all
# of these to your firewall config file.
# The options set in the firewall config file have the highest
# priority (will overwrite these one).

# FireHOL config directory.
# EVEN IF YOU CHANGE THIS, THE firehol-defaults.conf FILE
# SHOULD STILL EXIST IN /etc/firehol
FIREHOL_CONFIG_DIR="/etc/firehol"

# FireHOL services directory.
# FireHOL will look into this directory for service
# definition files (*.conf).
# Package maintainers may install their service definitions
# in this directory.
# Default: /etc/firehol/services
FIREHOL_SERVICES_DIR="${FIREHOL_CONFIG_DIR}/services"

# Where to permanently save state information?
# Default: /var/spool/firehol
FIREHOL_SPOOL_DIR="/var/spool/firehol"

# Where temporary files should go?
# /var/run is usualy a ram drive, so we prefer to use
# this for temporary files.
# Default: /var/run/firehol
FIREHOL_RUN_DIR="/var/run/firehol"

# Restore instead of Start when possible.
# If set to 1, FireHOL will actually do a 'restore' when a
# 'start' is requested.
# If enabled and the config files have not changed since
# the last successful activation, the last successfuly
# activated firewall will be restored.
# THIS OPTION SHOULD NOT BE ENABLED IF THE FIREWALL CONFIG
# IS USING DYNAMIC DETECTION OF SERVER PORTS OR OTHER DATA
# THAT MAY INFLUENCE THE GENERATED RULES.
# At the other hand, if the firewall is always static
# this option provides fast startup of the firewall.
# Default: 0
FIREHOL_RESTORE_INSTEAD_OF_START="0"

# Enable IPv4 firewall
# Default: 1
ENABLE_IPV4="1"

# Enable IPv6 firewall
# Default: 1
ENABLE_IPV6="1"

# Syslog facility to use when logging FireHOL events.
# This is only used by FireHOL, not the iptables packet
# logging mechanism.
# Default: daemon
FIREHOL_SYSLOG_FACILITY="daemon"

# FireHOL can wait for an interface to come up.
# Set the interface name to wait for, here.
# Default: check the environment variable, if any
WAIT_FOR_IFACE="${WAIT_FOR_IFACE}"

# External program to call on 'start' (successfull or
# failed), 'stop' and 'panic'
# It will be run like this:
# "${FIREHOL_NOTIFICATION_PROGRAM}" "${FIREHOL_CONFIG}" "${result}" "${restored}" "${work_error}" "${work_runtime_error}"
# where
#    FIREHOL_CONFIG is the filename of the config
#    result is either empty, OK or FAILED
#    restored is either NO, OK or FAILED
#    work_error is the count of pre-processing errors encountered
#    work_runtime_error is the count of post-processing errors encountered
# Default: check the environment variable, if any
FIREHOL_NOTIFICATION_PROGRAM="${FIREHOL_NOTIFICATION_PROGRAM}"


# ----------------------------------------------------------------------
# RUNTIME CONTROL VARIABLES

# These do not affect the final firewall output. They just control how
# FireHOL behaves.
# They can also be set as environment variables of the same name.

# If set to 1, FireHOL will attempt to activate the firewall with
# iptables-restore. This is a lot faster firewall activation.
# The only drawback of this, is that in case of error, FireHOL may be
# unable to identify the exact statement in the firewall config that
# caused the error.
# Default: 1
FIREHOL_FAST_ACTIVATION="${FIREHOL_FAST_ACTIVATION-1}"

# If set to 0, firehol will not try to load the required kernel modules
# Generally, FireHOL is able to detect if a module is compiled in the
# kernel, even if this is set to 1.
# Default: 1
FIREHOL_LOAD_KERNEL_MODULES="${FIREHOL_LOAD_KERNEL_MODULES-1}"

# Firewall Policy during firewall activation
# Default: ACCEPT
# Possible values: ACCEPT, REJECT, DROP
FIREHOL_INPUT_ACTIVATION_POLICY="${FIREHOL_INPUT_ACTIVATION_POLICY-ACCEPT}"
FIREHOL_OUTPUT_ACTIVATION_POLICY="${FIREHOL_OUTPUT_ACTIVATION_POLICY-ACCEPT}"
FIREHOL_FORWARD_ACTIVATION_POLICY="${FIREHOL_FORWARD_ACTIVATION_POLICY-ACCEPT}"

# Do we allow pre-existing connections to continue during activation?
# If this is set to 0 and FIREHOL_FAST_ACTIVATION is also set to 0, then
# every time the firewall is activated, existing connections will be disrupted.
# Default: 1
FIREHOL_ESTABLISHED_ACTIVATION_ACCEPT="${FIREHOL_ESTABLISHED_ACTIVATION_ACCEPT-1}"

# Set this to 1 have firehol load NAT kernel modules
# It will be enabled automatically if nat commands are given in the firewall
# Default: 0
FIREHOL_NAT="${FIREHOL_NAT-0}"

# Set this to 1 to enable rooting of packets in the kernel
# It will be enabled automatically if routers are defined in the firewall
# Default: 0
FIREHOL_ROUTING="${FIREHOL_ROUTING-0}"

# If you want to restore the firewall using the iptables init script of
# your distribution, set here the paths where it expects the rules.
# These settings are only saved when 'save' is requested at the command line.
# Default: unset for automatic detection.
FIREHOL_AUTOSAVE=
FIREHOL_AUTOSAVE6=

# Ready to use values for various distributions:
#
# Gentoo
# Check: /etc/conf.d/iptables and ip6tables
#FIREHOL_AUTOSAVE="/var/lib/iptables/rules-save"
#FIREHOL_AUTOSAVE6="/var/lib/ip6tables/rules-save"
#
# Arch
# Check: /usr/lib/systemd/system/iptables.service and ip6tables.service
#FIREHOL_AUTOSAVE=/etc/iptables/iptables.rules
#FIREHOL_AUTOSAVE6=/etc/iptables/ip6tables.rules


# ----------------------------------------------------------------------
# FIREWALL CONFIGURATION VARIABLES

# These affect the final output firewall.
# They can also be set in the firewall config file.

# The default policy for the interfaces of the firewall.
# This can be controlled on a per interface basis using the
# policy interface subcommand. 
# Default: DROP
# Possible Values: DROP REJECT RETURN
DEFAULT_INTERFACE_POLICY="DROP"

# The default policy for the router commands of the firewall.
# This can be controlled on a per interface basis using the
# policy interface subscommand.
# Default: RETURN
# Possible Values: DROP REJECT RETURN
DEFAULT_ROUTER_POLICY="RETURN"

# Should we drop all INVALID packets always?
# INVALID packets as seen by the connection tracker.
# Default: 0
FIREHOL_DROP_INVALID=0

# At the end of the firewall, there may be packets not matched
# anywhere. What to do with them?
# Default: DROP
# Possible Values: DROP REJECT
UNMATCHED_INPUT_POLICY="DROP"
UNMATCHED_OUTPUT_POLICY="DROP"
UNMATCHED_ROUTER_POLICY="DROP"

# The client ports to be used for "default" client ports when the
# client specified is a foreign host.
# Note that FireHOL will ask the kernel for default client ports of
# the local host. This setting only applies to client ports of remote hosts.
# Default: 1024:65535
DEFAULT_CLIENT_PORTS="1024:65535"

# If set to 0, FireHOL will NOT trust interface lo for all traffic, thus
# a firewall could be set up on lo.
# Default: 1
FIREHOL_TRUST_LOOPBACK=1


# ----------------------------------------------------------------------
# IPTABLES PACKETS LOGGING

# LOG mode for iptables
# Default: LOG
# Possible Values: LOG, ULOG, NFLOG
# LOG = syslog
# We recommend to install ulogd and use NFLOG.
FIREHOL_LOG_MODE="LOG"

# Accepts anything iptables accepts for each mode.
# Check: iptables -j LOG --help
#        iptables -j ULOG --help
#        iptables -j NFLOG --help
# Default: empty
FIREHOL_LOG_OPTIONS=""

# FireHOL can prefix each log with a keyword.
# Default: empty
FIREHOL_LOG_PREFIX=""

# Used only for FIREHOL_LOG_MODE="LOG"
# The syslog level to be used when logging packets.
FIREHOL_LOG_LEVEL="warning"

# For loglimit, these are the frequency and the burst
# of logging. They are applied per logging rule, not across
# the firewall.
FIREHOL_LOG_FREQUENCY="1/second"
FIREHOL_LOG_BURST="5"

# If set to 1, FireHOL will silently drop orphan TCP packets with ACK,FIN set.
# In modern kernels, the connection tracker detects closed sockets
# and removes them from memory before receiving the FIN,ACK from the remote
# party. This makes FireHOL log these packets when they will be received.
# To silently drop these packets, enable this option.
# Default: 1
FIREHOL_DROP_ORPHAN_TCP_ACK_FIN=1


# ----------------------------------------------------------------------
# DEFAULT IP SETS

# FireHOL will overwite these settings with the contents of the files with
# the same names in ${FIREHOL_CONFIG_DIR}.
#
# For example, RESERVED_IPV4 will be set from /etc/firehol/RESERVED_IPV4

# IANA reserved address space that should never appear
RESERVED_IPV4="0.0.0.0/8 127.0.0.0/8 240.0.0.0/4 "
RESERVED_IPV6="::/8 0100::/8 0200::/7 0400::/6 0800::/5 1000::/4 4000::/3 6000::/3 8000::/3 A000::/3 C000::/3 E000::/4 F000::/5 F800::/6 FE00::/9 FEC0::/10"

# Private IPv4 address space
# 10.0.0.0/8       => RFC 1918: IANA Private Use
# 169.254.0.0/16   => Link Local
# 192.0.2.0/24     => Test Net
# 192.88.99.0/24   => RFC 3068: 6to4 anycast & RFC 2544: Benchmarking addresses
# 192.168.0.0/16   => RFC 1918: Private use
PRIVATE_IPV4="10.0.0.0/8 169.254.0.0/16 172.16.0.0/12 192.0.2.0/24 192.88.99.0/24 192.168.0.0/16"

# Private IPv6 address space
# FC00::/7         => Unique Local Unicast
# FE80::/10        => Link Local Unicast
PRIVATE_IPV6="FC00::/7 FE80::/10"

# The multicast address space
MULTICAST_IPV4="224.0.0.0/4"
MULTICAST_IPV6="FF00::/16"

# --- END OF FIREHOL DEFAULTS ---

if [ -f "${FIREHOL_CONFIG_DIR}/firehol-defaults.conf" ]
then
	source "${FIREHOL_CONFIG_DIR}/firehol-defaults.conf" || exit 1
fi

# config file
FIREHOL_CONFIG="${FIREHOL_CONFIG_DIR}/firehol.conf"

# Concurrent run control
FIREHOL_LOCK_FILE="${FIREHOL_RUN_DIR}/firehol.lck"



# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# EXTERNAL/SYSTEM COMMANDS MANAGEMENT
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

export PATH="${PATH}:/bin:/usr/bin:/sbin:/usr/sbin"

# External commands FireHOL will need.
# If one of those is not found, FireHOL will refuse to run.

which_cmd() {
	local block=1
	if [ "a${1}" = "a-n" ]
	then
		local block=0
		shift
	fi
	
	unalias $2 >/dev/null 2>&1
	local cmd=`which $2 2>/dev/null | head -n 1`
	if [ $? -gt 0 -o ! -x "${cmd}" ]
	then
		if [ ${block} -eq 1 ]
		then
			echo >&2
			echo >&2 "ERROR:	Command '$2' not found in the system path."
			echo >&2 "	FireHOL requires this command for its operation."
			echo >&2 "	Please install the required package and retry."
			echo >&2
			echo >&2 "	Note that you need an operational 'which' command"
			echo >&2 "	for FireHOL to find all the external programs it"
			echo >&2 "	needs. Check it yourself. Run:"
			echo >&2
			echo >&2 "	which $2"
			exit 1
		fi
		return 1
	fi
	
	eval $1=${cmd}
	return 0
}

# command on demand support.
require_cmd() {
	local block=1
	if [ "a$1" = "a-n" ]
	then
		local block=0
		shift
	fi
	
	# if one is found, return success
	for x in "${@}"
	do
		eval var=`echo ${x} | tr 'a-z-' 'A-Z_'`_CMD
		eval val=\$\{${var}\}
		if [ -z "${val}" ]
		then
			which_cmd -n "${var}" "${x}"
			test $? -eq 0 && return 0
		fi
	done
	
	if [ $block -eq 1 ]
	then
		echo >&2
		echo >&2 "ERROR:	FIREHOL REQUIRES THESE COMMANDS:"
		echo >&2
		echo >&2 "	${@}"
		echo >&2
		echo >&2 "	You have requested the use of an optional FireHOL"
		echo >&2 "	feature that requires certain external programs"
		echo >&2 "	to be installed in the running system."
		echo >&2
		echo >&2 "	Please consult your Linux distribution manual to"
		echo >&2 "	install the package(s) that provide these external"
		echo >&2 "	programs and retry."
		echo >&2
		echo >&2 "	Note that you need an operational 'which' command"
		echo >&2 "	for FireHOL to find all the external programs it"
		echo >&2 "	needs. Check it yourself. Run:"
		echo >&2
		for x in "${@}"
		do
			echo >&2 "	which $x"
		done
		
		exit 1
	fi
	
	return 1
}

# Currently the following commands are required only when needed.
# (i.e. Command on Demand)
#
# zcat or gzcat or gzip (either or none is fine)
# less or more (either or none is fine)
# ip
# ss
# date
# hostname
# modprobe or insmod
# gawk or awk
# nice (none is fine)

# Commands that are mandatory for FireHOL operation:
which_cmd CAT_CMD cat
which_cmd CUT_CMD cut
which_cmd CHOWN_CMD chown
which_cmd CHMOD_CMD chmod
which_cmd EGREP_CMD egrep
which_cmd EXPR_CMD expr
which_cmd FIND_CMD find
which_cmd FOLD_CMD fold
which_cmd GREP_CMD grep
which_cmd HEAD_CMD head
which_cmd TAIL_CMD tail
which_cmd LSMOD_CMD lsmod
which_cmd MKDIR_CMD mkdir
which_cmd MKTEMP_CMD mktemp
which_cmd MV_CMD mv
which_cmd RM_CMD rm
which_cmd SED_CMD sed
which_cmd SORT_CMD sort
which_cmd SYSCTL_CMD sysctl
which_cmd TOUCH_CMD touch
which_cmd TR_CMD tr
which_cmd UNAME_CMD uname
which_cmd UNIQ_CMD uniq
which_cmd LOGGER_CMD logger
which_cmd FLOCK_CMD flock

if [ ! -f "${FIREHOL_CONFIG_DIR}/firehol-defaults.conf" ]
then
	"${EGREP_CMD}" "^# --- BEGIN OF FIREHOL DEFAULTS ---" -A 600 "${FIREHOL_FILE}" |\
		"${EGREP_CMD}" "^# --- END OF FIREHOL DEFAULTS ---" -B 600 >"${FIREHOL_CONFIG_DIR}/firehol-defaults.conf" || exit 1
	"${CHOWN_CMD}" root:root "${FIREHOL_CONFIG_DIR}/firehol-defaults.conf"	|| exit 1
	"${CHMOD_CMD}" 600 "${FIREHOL_CONFIG_DIR}/firehol-defaults.conf"	|| exit 1
fi

ENABLE_ACCOUNTING=1
ACCOUNTING_WARNING=0
require_cmd -n nfacct
if [ -z "${NFACCT_CMD}" ]
then
	# silently disable accounting here,
	# the user will get a warning when the first
	# accounting rule is evaluated
	ENABLE_ACCOUNTING=0
	ACCOUNTING_WARNING=1
fi

if [ ${ENABLE_IPV4} -eq 1 ]
	then
	require_cmd -n iptables
	require_cmd -n iptables-save
	require_cmd -n iptables-restore
	if [ -z "${IPTABLES_CMD}" ]
	then
		echo >&2 " WARNING: no iptables command: IPv4 disabled"
		ENABLE_IPV4=0
	elif [ -z "${IPTABLES_SAVE_CMD}" ]
	then
		echo >&2 " WARNING: no iptables-save command: IPv4 disabled"
		ENABLE_IPV4=0
	elif [ -z "${IPTABLES_RESTORE_CMD}" ]
	then
		echo >&2 " WARNING: no iptables-restore command: IPv4 disabled"
		ENABLE_IPV4=0
	fi
fi

if [ ${ENABLE_IPV6} -eq 1 ]
	then
	require_cmd -n ip6tables
	require_cmd -n ip6tables-save
	require_cmd -n ip6tables-restore
	if [ ! -f /proc/net/if_inet6 ]
	then
		# IPv6 not in use on this system, silently ignore
		ENABLE_IPV6=0
	elif [ -z "${IP6TABLES_CMD}" ]
	then
		echo >&2 " WARNING: no ip6tables command: IPv6 disabled"
		ENABLE_IPV6=0
	elif [ -z "${IP6TABLES_SAVE_CMD}" ]
	then
		echo >&2 " WARNING: no ip6tables-save command: IPv6 disabled"
		ENABLE_IPV6=0
	elif [ -z "${IP6TABLES_RESTORE_CMD}" ]
	then
		echo >&2 " WARNING: no ip6tables-restore command: IPv6 disabled"
		ENABLE_IPV6=0
	fi
fi

# Special commands
pager_cmd() {
	if [ -z "${LESS_CMD}" ]
	then
		require_cmd -n less more
		test -z "${LESS_CMD}" && LESS_CMD="${MORE_CMD}"
		test -z "${LESS_CMD}" && LESS_CMD="${CAT_CMD}"
	fi
	
	"${LESS_CMD}" "${@}"
}

zcat_cmd() {
	require_cmd -n zcat gzcat gzip
	test -z "${ZCAT_CMD}" && ZCAT_CMD="${GZCAT_CMD}"
	
	if [ ! -z "${ZCAT_CMD}" ]
	then
		"${ZCAT_CMD}" "${@}"
		return $?
	elif [ ! -z "${GZIP_CMD}" ]
	then
		"${CAT_CMD}" "${@}" | "${GZIP_CMD}" -dc
		return $?
	fi
	
	echo >&2 " "
	echo >&2 " IMPORTANT WARNING:"
	echo >&2 " ------------------"
	echo >&2 " FireHOL cannot find any of the commands: zcat, gzcat, gzip."
	echo >&2 " Make sure you have one of these available in the system path."
	echo >&2 " "
	
	return 1
}

gawk_cmd() {
	require_cmd -n gawk awk
	test -z "${GAWK_CMD}" && GAWK_CMD="${AWK_CMD}"
	
	if [ ! -z "${GAWK_CMD}" ]
	then
		"${GAWK_CMD}" "${@}"
		return $?
	fi
	
	echo >&2 " "
	echo >&2 " IMPORTANT WARNING:"
	echo >&2 " ------------------"
	echo >&2 " FireHOL cannot find any of the commands: gawk, awk."
	echo >&2 " Make sure you have one of these available in the system path."
	echo >&2 " "
	
	return 1
}

modprobe_cmd() {
	require_cmd -n modprobe insmod
	test -z "${MODPROBE_CMD}" && MODPROBE_CMD="${INSMOD_CMD}"
	
	if [ ! -z "${MODPROBE_CMD}" ]
	then
		save_for_restore none "${MODPROBE_CMD}" "${@}"
		"${MODPROBE_CMD}" "${@}"
		status=$?
		if [ $status -eq 17 ]
		then
			# insmod: module already loaded - not a problem
			return 0
		else
			return $status
		fi
	fi
	
	echo >&2 " "
	echo >&2 " IMPORTANT WARNING:"
	echo >&2 " ------------------"
	echo >&2 " FireHOL cannot find any of the commands: modprobe, insmod."
	echo >&2 " Make sure you have one of these available in the system path."
	echo >&2 " "
	
	return 1
}

renice_cmd() {
	if [ -z "${RENICE_CMD}" ]
	then
		require_cmd -n renice
		test -z "${RENICE_CMD}" && RENICE_CMD=":"
	fi
	
	"${RENICE_CMD}" "${@}"
}

firehol_concurrent_run_lock() {
	exec 200>"${FIREHOL_LOCK_FILE}"
	if [ $? -ne 0 ]; then exit; fi
	${FLOCK_CMD} -n 200
	if [ $? -ne 0 ]
	then
		echo >&2 "FireHOL is already running. Exiting..."
		exit 1
	fi
	return 0
}

# Make sure our generated files cannot be accessed by anyone else.
umask 077

# Be nice on production environments
renice_cmd 10 $$ >/dev/null 2>/dev/null

# Initialize iptables
if [ $ENABLE_IPV4 -eq 1 ]
then
	${IPTABLES_CMD} -nxvL >/dev/null 2>&1
	if [ $? -ne 0 ]
	then
		echo >&2 " WARNING: error initializing iptables: IPv4 disabled"
		ENABLE_IPV4=0
	fi
fi

if [ $ENABLE_IPV6 -eq 1 ]
then
	${IP6TABLES_CMD} -nxvL >/dev/null 2>&1
	if [ $? -ne 0 ]
	then
		echo >&2 " WARNING: error initializing ip6tables: IPv6 disabled"
		ENABLE_IPV6=0
	fi
fi

if [ $ENABLE_IPV4 -eq 0 -a $ENABLE_IPV6 -eq 0 ]
then
	echo >&2 " ERROR: Neither IPv4 nor IPv6 is available - exiting"
	exit 1
fi


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# GLOBAL PREPARATIONS
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

# ----------------------------------------------------------------------
# Directories and files

if [ ! -d "${FIREHOL_RUN_DIR}" ]
then
	${MKDIR_CMD} -p "${FIREHOL_RUN_DIR}" 		|| exit 1
	"${CHOWN_CMD}" root:root "${FIREHOL_RUN_DIR}"	|| exit 1
	"${CHMOD_CMD}" 700 "${FIREHOL_RUN_DIR}"		|| exit 1
fi

if [ ! -d "${FIREHOL_SPOOL_DIR}" ]
then
	${MKDIR_CMD} -p "${FIREHOL_SPOOL_DIR}" 		|| exit 1
	"${CHOWN_CMD}" root:root "${FIREHOL_SPOOL_DIR}"	|| exit 1
	"${CHMOD_CMD}" 700 "${FIREHOL_SPOOL_DIR}"	|| exit 1
fi

# Create an empty temporary directory we need for this run.
if ! FIREHOL_DIR="`${MKTEMP_CMD} -d "${FIREHOL_RUN_DIR}/firehol-XXXXXXXXXX"`"
then
	echo >&2
	echo >&2
	echo >&2 "Cannot create temporary directory."
	echo >&2
	exit 1
fi
#FIREHOL_CHAINS_DIR="${FIREHOL_DIR}/chains"
FIREHOL_OUTPUT="${FIREHOL_DIR}/firehol-out.sh"
FIREHOL_SAVED="${FIREHOL_DIR}/firehol-save.sh"
FIREHOL_SAVED6="${FIREHOL_DIR}/firehol-save6.sh"
FIREHOL_TMP="${FIREHOL_DIR}/firehol-tmp.sh"


# ------------------------------------------------------------------------------
# Make sure we automatically cleanup when we exit.
# WHY:
# Even a CTRL-C will call this and we will not leave temp files.
# Also, if a configuration file breaks, we will detect this too.
FIREHOL_CLEAN_TMP=1
FIREHOL_ACTIVATED_SUCCESSFULLY=0

syslog() {
	local p="$1"; shift
	
	"${LOGGER_CMD}" -p ${FIREHOL_SYSLOG_FACILITY}.$p -t "FireHOL[$$]" "${@}"
	return 0
}

firehol_exit() {
	local restored="NO"
	if [ \( -f "${FIREHOL_SAVED}" -o -f "${FIREHOL_SAVED6}" \) -a "${FIREHOL_MODE}" = "START" ]
	then
		echo
		echo -n $"FireHOL: Restoring old firewall:"
		local status4=0
		local status6=0
		if [ $ENABLE_IPV4 -eq 1 ]
		then
			${IPTABLES_RESTORE_CMD} <"${FIREHOL_SAVED}"
			status4=$?
		fi
		if [ $ENABLE_IPV6 -eq 1 ]
		then
			${IP6TABLES_RESTORE_CMD} <"${FIREHOL_SAVED6}"
			status6=$?
		fi
		if [ $status4 -eq 0 -a $status6 -eq 0 ]
		then
			local restored="OK"
			success $"FireHOL: Restoring old firewall:"
		else
			local restored="FAILED"
			failure $"FireHOL: Restoring old firewall:"
		fi
		echo
	fi
	
	# remove the temporary directory created for this session
	if [ ${FIREHOL_ACTIVATED_SUCCESSFULLY} -eq 0 -a ${FIREHOL_CLEAN_TMP} -eq 0 ]
	then
		echo "FireHOL: temporary files left in ${FIREHOL_DIR}"
	else
		test -d "${FIREHOL_DIR}" && ${RM_CMD} -rf "${FIREHOL_DIR}"
	fi
	
	# syslog
	local result=
	local notify=0
	case "${FIREHOL_MODE}" in
		START)	if [ ${FIREHOL_ACTIVATED_SUCCESSFULLY} -eq 0 ]
			then
				syslog emerg "FAILED to activate the firewall from ${FIREHOL_CONFIG}. Last good firewall restoration: ${restored}."
				local result="FAILED"
			else
				syslog info "Successfully activated new firewall from ${FIREHOL_CONFIG}."
				local result="OK"
			fi
			local notify=1
			;;
		
		STOP)	syslog emerg "Firewall has been stopped. Policy is ACCEPT EVERYTHING!"
			local notify=1
			;;
			
		PANIC)	syslog emerg "PANIC! Machine has been locked. Policy is DROP EVERYTHING!"
			local notify=1
			;;
		
		*)	# do nothing for the rest
			local notify=0
			;;
	esac
	
	# do we have to run a program?
	if [ ${notify} -eq 1 ]
	then
		if [ ! -z "${FIREHOL_NOTIFICATION_PROGRAM}" -a -x "${FIREHOL_NOTIFICATION_PROGRAM}" ]
		then
			# we just fork it, so that it will not depend on terminal conditions
			"${FIREHOL_NOTIFICATION_PROGRAM}" "${FIREHOL_CONFIG}" "${result}" "${restored}" "${work_error}" "${work_runtime_error}" >/dev/null 2>&1 </dev/null &
		fi
	fi
	
	enable trap
	enable exit
	trap exit EXIT
	if [ ${FIREHOL_ACTIVATED_SUCCESSFULLY} -eq 0 ]
	then
		exit 1
	fi

	exit 0
}

# Run our exit even if we don't call exit.
trap firehol_exit EXIT
trap firehol_exit SIGHUP
trap firehol_exit INT


# ------------------------------------------------------------------------------
# Create the directories we need.

if [ ! -d "${FIREHOL_CONFIG_DIR}" ]
then
	"${MKDIR_CMD}" "${FIREHOL_CONFIG_DIR}"			|| exit 1
	"${CHOWN_CMD}" root:root "${FIREHOL_CONFIG_DIR}"	|| exit 1
	"${CHMOD_CMD}" 700 "${FIREHOL_CONFIG_DIR}"		|| exit 1
	
	if [ -f /etc/firehol.conf ]
	then
		"${MV_CMD}" /etc/firehol.conf "${FIREHOL_CONFIG}"	|| exit 1
		
		echo >&2
		echo >&2
		echo >&2 "NOTICE: Your config file /etc/firehol.conf has been moved to ${FIREHOL_CONFIG}"
		echo >&2
		sleep 5
	fi
fi

# Externally defined services can be placed in "${FIREHOL_SERVICES_DIR}"
if [ ! -d "${FIREHOL_SERVICES_DIR}" ]
then
	"${MKDIR_CMD}" -p "${FIREHOL_SERVICES_DIR}"
	if [ $? -ne 0 ]
	then
		echo >&2
		echo >&2
		echo >&2 "FireHOL needs to create the directory '${FIREHOL_SERVICES_DIR}', but it cannot."
		echo >&2 "Possibly you have a file with this name, or something else is happening."
		echo >&2 "Please solve this issue and retry".
		echo >&2
		exit 1
	fi
	"${CHOWN_CMD}" root:root "${FIREHOL_SERVICES_DIR}"
	"${CHMOD_CMD}" 700 "${FIREHOL_SERVICES_DIR}"
fi

#"${MKDIR_CMD}" "${FIREHOL_CHAINS_DIR}" || exit 1
"${MKDIR_CMD}" "${FIREHOL_DIR}/fast" || exit 1
"${MKDIR_CMD}" "${FIREHOL_DIR}/fast/tables"	|| exit 1
"${MKDIR_CMD}" "${FIREHOL_DIR}/fast/table6s" || exit 1

# prepare the file that will hold all modules to be loaded.
# this is needed only when we are going to save the firewall
# with iptables-save.
cat >"${FIREHOL_DIR}/firewall_restore_commands.sh" <<EOFMTL
#!/bin/sh
# Generated by FireHOL to execute additional actions
# to restore the generated firewall.
#

EOFMTL


# Make sure we have a directory for our data.
if [ ! -d "${FIREHOL_SPOOL_DIR}" ]
then
	"${MKDIR_CMD}" "${FIREHOL_SPOOL_DIR}"		|| exit 1
	"${CHOWN_CMD}" root:root "${FIREHOL_SPOOL_DIR}"	|| exit 1
	"${CHMOD_CMD}" 700 "${FIREHOL_SPOOL_DIR}"	|| exit 1
fi

load_ips() {
	local v="${1}" # the variable
	local f="${2}" # the old file-name
	local d="${3}" # the default value
	local dt="${4}" # days old
	local m="${5}" # additional info for file generation
	local c="${6}" # if set, complain if file is missing

	# We load from a file with the variable name if found but will use
	# the old file name for compatibility
	if [ "${f}" != ${v} \
             -a -f "${FIREHOL_CONFIG_DIR}/${f}" \
             -a -f "${FIREHOL_CONFIG_DIR}/${v}" ]
	then
		echo >&2 "WARNING "
		echo >&2 "Found ${f} and ${v} in '${FIREHOL_CONFIG_DIR}'"
		echo >&2 "Using ${v}"
		f=${v}
	elif [ -f "${FIREHOL_CONFIG_DIR}/${v}" ]
	then
		f=${v}
	else
		: # Using the 'old' name
	fi

	if [ ! -f "${FIREHOL_CONFIG_DIR}/${f}" ]
	then
		if [ ! -z "${c}" ]
		then
			echo >&2
			echo >&2
			echo >&2 "WARNING "
			echo >&2 "Cannot find file '${FIREHOL_CONFIG_DIR}/${v}'."
			echo >&2 "Using internal default values for variable '${v}' and all inherited ones."
			echo >&2
			
			if [ ! -z "${m}" ]
			then
				echo >&2 "${m}"
				echo >&2
			fi
		fi
		
		eval "export ${v}=\"${d}\""
		return 0
	fi
	
	if [ ${dt} -gt 0 ]
	then
		local t=`${FIND_CMD} "${FIREHOL_CONFIG_DIR}/${f}" -mtime +${dt}`
		if [ ! -z "${t}" ]
		then
			echo >&2
			echo >&2
			echo >&2 "WARNING"
			echo >&2 "File '${FIREHOL_CONFIG_DIR}/${f}' is more than ${dt} days old."
			echo >&2 "You should update it to ensure proper operation of your firewall."
			echo >&2
			
			if [ ! -z "${m}" ]
			then
				echo >&2 "${m}"
				echo >&2
			fi
		fi
	fi
	
	local t=`${CAT_CMD} "${FIREHOL_CONFIG_DIR}/${f}" | ${EGREP_CMD} "^ *[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/[0-9]+ *$"`
	local t2=
	local i=0
	for x in ${t}
	do
		i=$[i + 1]
		t2="${t2} ${x}"
	done
	
	local t6=`${CAT_CMD} "${FIREHOL_CONFIG_DIR}/${f}" | ${EGREP_CMD} "^ *((([0-9A-Fa-f]{1,4}:){7}(([0-9A-Fa-f]{1,4})|:))|(([0-9A-Fa-f]{1,4}:){6}(:|((25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})|(:[0-9A-Fa-f]{1,4})))|(([0-9A-Fa-f]{1,4}:){5}((:((25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|(([0-9A-Fa-f]{1,4}:){4}(:[0-9A-Fa-f]{1,4}){0,1}((:((25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|(([0-9A-Fa-f]{1,4}:){3}(:[0-9A-Fa-f]{1,4}){0,2}((:((25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|(([0-9A-Fa-f]{1,4}:){2}(:[0-9A-Fa-f]{1,4}){0,3}((:((25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|(([0-9A-Fa-f]{1,4}:)(:[0-9A-Fa-f]{1,4}){0,4}((:((25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|(:(:[0-9A-Fa-f]{1,4}){0,5}((:((25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|(((25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})))(%.+)?/[0-9]+ *$"`
	for x in ${t6}
	do
		i=$[i + 1]
		t2="${t2} ${x}"
	done
	
	if [ ${i} -eq 0 -o -z "${t2}" ]
	then
		echo >&2
		echo >&2
		echo >&2 "WARNING "
		echo >&2 "The file '${FIREHOL_CONFIG_DIR}/${f}' contains zero IP definitions."
		echo >&2 "Using internal default values for variable '${v}' and all inherited ones."
		echo >&2
		
		if [ ! -z "${m}" ]
		then
			echo >&2 "${m}"
			echo >&2
		fi
		
		eval "export ${v}=\"${d}\""
		return 0
	fi
	
	eval "export ${v}=\"${t2}\""
	return 0
}

# ------------------------------------------------------------------------------
# IP definitions

# IANA Reserved IPv4 address space.
load_ips RESERVED_IPV4 RESERVED_IPS "${RESERVED_IPV4}" 0
load_ips RESERVED_IPV6 RESERVED_IPV6 "${RESERVED_IPV6}" 0

# Make the original name a context-dependent function
RESERVED_IPS="reserved_ips()"
reserved_ips() {
	if running_both; then
		error "Cannot be called in 'both' mode"
		return 1
	fi
	if running_ipv6; then
		echo "${RESERVED_IPV6}"
	else
		echo "${RESERVED_IPV4}"
	fi
	return 0
}

# private IP address space
load_ips PRIVATE_IPV4 PRIVATE_IPS "${PRIVATE_IPV4}" 0
load_ips PRIVATE_IPV6 PRIVATE_IPV6 "${PRIVATE_IPV6}" 0

PRIVATE_IPS="private_ips()"
private_ips() {
	if running_both; then
		error "Cannot be called in 'both' mode"
		return 1
	fi
	if running_ipv6; then
		echo "${PRIVATE_IPV6}"
	else
		echo "${PRIVATE_IPV4}"
	fi
	return 0
}

# The multicast address space
load_ips MULTICAST_IPV4 MULTICAST_IPS "${MULTICAST_IPV4}" 0
load_ips MULTICAST_IPV6 MULTICAST_IPV6 "${MULTICAST_IPV6}" 0

MULTICAST_IPS="multicast_ips()"
multicast_ips() {
	if running_both; then
		error "Cannot be called in 'both' mode"
		return 1
	fi
	if running_ipv6; then
		echo "${MULTICAST_IPV6}"
	else
		echo "${MULTICAST_IPV4}"
	fi
	return 0
}

# A shortcut to have all the Internet unroutable addresses in one
# variable
UNROUTABLE_IPV4="${RESERVED_IPV4} ${PRIVATE_IPV4}"
load_ips UNROUTABLE_IPV4 UNROUTABLE_IPS "${UNROUTABLE_IPV4}" 0

UNROUTABLE_IPV6="${RESERVED_IPV6} ${PRIVATE_IPV6}"
load_ips UNROUTABLE_IPV6 UNROUTABLE_IPV6 "${UNROUTABLE_IPV6}" 0

UNROUTABLE_IPS="unroutable_ips()"
unroutable_ips() {
	if running_both; then
		error "Cannot be called in 'both' mode"
		return 1
	fi
	if running_ipv6; then
		echo "${UNROUTABLE_IPV6}"
	else
		echo "${UNROUTABLE_IPV4}"
	fi
	return 0
}


if [ $ENABLE_IPV4 -eq 1 -a $ENABLE_IPV6 -eq 1 ]
then
	FIREHOL_DEFAULT_NAMESPACE=both
elif [ $ENABLE_IPV4 -eq 1 ]
then
	FIREHOL_DEFAULT_NAMESPACE=ipv4
else
	FIREHOL_DEFAULT_NAMESPACE=ipv6
fi

# Get the default client ports from the kernel configuration.
# This is formed to a range of ports to be used for all "default"
# client ports when the client specified is the localhost.
#
# According to http://tldp.org/HOWTO/Linux+IPv6-HOWTO/proc-sys-net-ipv4..html
# the ipv4 values are also used for ipv6, so no needed change here
LOCAL_CLIENT_PORTS_LOW=`${SYSCTL_CMD} net.ipv4.ip_local_port_range | ${CUT_CMD} -d '=' -f 2 | ${CUT_CMD} -f 1`
LOCAL_CLIENT_PORTS_HIGH=`${SYSCTL_CMD} net.ipv4.ip_local_port_range | ${CUT_CMD} -d '=' -f 2 | ${CUT_CMD} -f 2`
LOCAL_CLIENT_PORTS="${LOCAL_CLIENT_PORTS_LOW}:${LOCAL_CLIENT_PORTS_HIGH}"


# ----------------------------------------------------------------------
# This is our version number. It is increased when the configuration
# file commands and arguments change their meaning and usage, so that
# the user will have to review it more precisely.
FIREHOL_VERSION=6


# ----------------------------------------------------------------------
# The initial line number of the configuration file.
FIREHOL_LINEID="INIT"

# Variable kernel module requirements.
# Suggested by Fco.Felix Belmonte <ffelix@gescosoft.com>
# Note that each of the complex services
# may add to this variable the kernel modules it requires.
FIREHOL_KERNEL_MODULES=
#
# In the configuration file you can write:
#
#                     require_kernel_module <module_name>
# 
# to have FireHOL require a specific module for the configurarion.

# Services may add themeselves to this variable so that the service "all" will
# also call them.
# By default it is empty - only rules programmers should change this.
ALL_SHOULD_ALSO_RUN=


# ------------------------------------------------------------------------------
# Various Defaults

# Valid modes:
# START, DEBUG, EXPLAIN, WIZARD, STOP, PANIC
FIREHOL_MODE="NONE"

# If set to 1, the firewall will be saved for normal iptables processing.
# Valid only for FIREHOL_MODE="START"
FIREHOL_SAVE=0

# If set to 1, the firewall will be restored if you don't commit it.
# Valid only for FIREHOL_MODE="START"
FIREHOL_TRY=0

# If set to 1, firehol will output the commands of the configuration file
# with variables expanded.
FIREHOL_CONF_SHOW=1

# ------------------------------------------------------------------------------
# Keep information about the current namespace: ipv4, ipv6 or both
FIREHOL_NS_STACK=
FIREHOL_NS_CURR=$FIREHOL_DEFAULT_NAMESPACE
FIREHOL_NS_PREP=

peek_namespace() {
	local ns=$(echo $FIREHOL_NS_STACK | cut -f1 -d:)
	if [ "$ns" = "" ]
	then
		echo $FIREHOL_DEFAULT_NAMESPACE
	else
		echo $ns
	fi
}

push_namespace() {
	if [ "$1" != "ipv4" -a "$1" != "ipv6" -a "$1" != "both" ]
	then
		error "Bad namespace: $1 (must be ipv4/ipv6/both)"
		return 1
	fi
	if [ "${FIREHOL_NS_CURR}" != "both" -a "$1" != "${FIREHOL_NS_CURR}" ]
	then
		error "Cannot use namespace $1 within ${FIREHOL_NS_CURR}"
		return 1
	fi
	FIREHOL_NS_STACK="$1:$FIREHOL_NS_STACK"
	FIREHOL_NS_CURR=$(peek_namespace)
	return 0
}

pop_namespace() {
	FIREHOL_NS_STACK=$(echo $FIREHOL_NS_STACK | cut -f2- -d:)
	FIREHOL_NS_CURR=$(peek_namespace)
	return 0
}

running_ipv4() {
	if [ "${FIREHOL_NS_CURR}" = "ipv4" -o "${FIREHOL_NS_CURR}" = "both" ]
	then
		return 0;
	fi
	return 1
}

running_ipv6() {
	if [ "${FIREHOL_NS_CURR}" = "ipv6" -o "${FIREHOL_NS_CURR}" = "both" ]
	then
		return 0;
	fi
	return 1
}

running_both() {
	if [ "${FIREHOL_NS_CURR}" = "both" ]
	then
		return 0;
	fi
	return 1
}

ipv4() {
	local command="$1"
	shift

	if [ "${command}" = "interface" -o  "${command}" = "router" ]
	then
		# Old rules must be closed before these apply
		FIREHOL_NS_PREP=ipv4
		$command "$@"
		status=$?
	else
		if ! push_namespace ipv4; then return 1; fi
		$command "$@"
		status=$?
		pop_namespace
	fi
	return $status
}

ipv6() {
	local command="$1"
	shift

	if [ "${command}" = "interface" -o  "${command}" = "router" ]
	then
		# Old rules must be closed before these apply
		FIREHOL_NS_PREP=ipv6
		$command "$@"
		status=$?
	else
		if ! push_namespace ipv6; then return 1; fi
		$command "$@"
		status=$?
		pop_namespace
	fi
	return $status
}

both() {
	local command="$1"
	shift

	if [ "${command}" = "interface" -o  "${command}" = "router" ]
	then
		# Old rules must be closed before these apply
		FIREHOL_NS_PREP=$FIREHOL_DEFAULT_NAMESPACE
		$command "$@"
		status=$?
	else
		if ! push_namespace both; then return 1; fi
		$command "$@"
		status=$?
		pop_namespace
	fi
	return $status
}

expression_list() {
	# Clean up a complex expression expressions, such that e.g.
	# fun0 ( x ) word  word2 fun1(a b) ...
	# Becomes:
	#  fun0(x)
	#  word
	#  word2
	#  fun(a,b)
	#  ....
	# 1st sed: remove excess space, insert newlines at end of functions
	# 2nd sed: insert newlines before functions that are preceded by words
	# 3nd sed: function? no: split words to lines. yes: comma parameters.
	echo "$@" | tr '\t' ' ' | \
		sed -e 's/   */ /g' \
			-e 's/ *\([()]\) */\1/g' \
			-e 's/)/)\
/g' | \
		sed -e 's/ \([^ ][^ ]*\)(/\
\1(/' | \
		sed -e '/[()]/bfun' -e 's/ /\n/g' -e ':fun' -e 's/ /,/g'
}

eval_param() {
	expression_list "$@" | \
	while read exp
	do
		case "$exp" in
			*"("*)
				$(echo "$exp" | tr '(),' '   ')
			;;
			*)
				echo "$exp"
			;;
		esac
	done
}

# ------------------------------------------------------------------------------
# Keep information about the current primary command
# Primary commands are: interface, router

work_counter4=0
work_counter6=0
work_cmd=
work_realcmd=("(unset)")
work_name=
work_inface=
work_outface=
work_policy=
work_error=0
work_function="Initializing"

get_next_work_counter() {
	local var="$1"
	if running_both
	then
		if [ $work_counter4 -gt $work_counter6 ]
		then
			work_counter4=$[work_counter4 + 1]
			work_counter6=$[work_counter4]
		else
			work_counter6=$[work_counter6 + 1]
			work_counter4=$[work_counter6]
		fi
		eval ${var}=${work_counter4}
	elif running_ipv6
	then
		work_counter6=$[work_counter6 + 1]
		eval ${var}=${work_counter6}
	else
		work_counter4=$[work_counter4 + 1]
		eval ${var}=${work_counter4}
	fi
}


# ------------------------------------------------------------------------------
# Keep status information

# 0 = no errors, >0 = there were errors in the script
work_runtime_error=0

# This function is used for generating dynamic chains when needed for
# combined negative statements (AND) implied by the "not" parameter
# to many FireHOL directives.
# What FireHOL is doing to accomplish this, is to produce dynamically
# a linked list of iptables chains with just one condition each, making
# the packets to traverse from chain to chain when matched, to reach
# their final destination.
dynamic_counter4=0
dynamic_counter6=0

get_next_dynamic_counter() {
	local var="$1"
	if running_both
	then
		if [ $dynamic_counter4 -gt $dynamic_counter6 ]
		then
			dynamic_counter4=$[dynamic_counter4 + 1]
			dynamic_counter6=$[dynamic_counter4]
		else
			dynamic_counter6=$[dynamic_counter6 + 1]
			dynamic_counter4=$[dynamic_counter6]
		fi
		eval ${var}=${dynamic_counter4}
	elif running_ipv6
	then
		dynamic_counter6=$[dynamic_counter6 + 1]
		eval ${var}=${dynamic_counter6}
	else
		dynamic_counter4=$[dynamic_counter4 + 1]
		eval ${var}=${dynamic_counter4}
	fi
}

# Services API version
FIREHOL_SERVICES_API="1"


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# SIMPLE SERVICES DEFINITIONS
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
# The following are definitions for simple services.
# We define as "simple" the services that are implemented using a single socket,
# initiated by the client and used by the server.
#
# The following list is sorted by service name.

server_AH_ports="51/any"
client_AH_ports="any"

server_amanda_ports="udp/10080"
client_amanda_ports="default"
helper_amanda="amanda"

server_aptproxy_ports="tcp/9999"
client_aptproxy_ports="default"

server_apcupsd_ports="tcp/6544"
client_apcupsd_ports="default"

server_apcupsdnis_ports="tcp/3551"
client_apcupsdnis_ports="default"

server_asterisk_ports="tcp/5038"
client_asterisk_ports="default"

server_cups_ports="tcp/631 udp/631"
client_cups_ports="any"

server_cvspserver_ports="tcp/2401"
client_cvspserver_ports="default"

server_darkstat_ports="tcp/666"
client_darkstat_ports="default"

server_daytime_ports="tcp/13"
client_daytime_ports="default"

server_dcc_ports="udp/6277"
client_dcc_ports="default"

server_dcpp_ports="tcp/1412 udp/1412"
client_dcpp_ports="default"

server_dns_ports="udp/53 tcp/53"
client_dns_ports="any"

server_dhcprelay_ports="udp/67"
client_dhcprelay_ports="67"

server_dict_ports="tcp/2628"
client_dict_ports="default"

server_distcc_ports="tcp/3632"
client_distcc_ports="default"

server_eserver_ports="tcp/4661 udp/4661 udp/4665"
client_eserver_ports="any"

server_ESP_ports="50/any"
client_ESP_ports="any"

server_echo_ports="tcp/7"
client_echo_ports="default"

server_finger_ports="tcp/79"
client_finger_ports="default"

server_ftp_ports="tcp/21"
client_ftp_ports="default"
helper_ftp="ftp"
ALL_SHOULD_ALSO_RUN="${ALL_SHOULD_ALSO_RUN} ftp"

server_gift_ports="tcp/4302 tcp/1214 tcp/2182 tcp/2472"
client_gift_ports="any"

server_giftui_ports="tcp/1213"
client_giftui_ports="default"

server_gkrellmd_ports="tcp/19150"
client_gkrellmd_ports="default"

server_GRE_ports="47/any"
client_GRE_ports="any"
helper_GRE="proto_gre"

server_h323_ports="tcp/1720"
client_h323_ports="default"
helper_h323="h323"

server_heartbeat_ports="udp/690:699"
client_heartbeat_ports="default"

server_http_ports="tcp/80"
client_http_ports="default"

server_https_ports="tcp/443"
client_https_ports="default"

server_httpalt_ports="tcp/8080"
client_httpalt_ports="default"

server_iax_ports="udp/5036"
client_iax_ports="default"

server_iax2_ports="udp/5469 udp/4569"
client_iax2_ports="default"

server_ICMP_ports="icmp/any"
client_ICMP_ports="any"

server_icmp_ports="${server_ICMP_ports}"
client_icmp_ports="${client_ICMP_ports}"
# ALL_SHOULD_ALSO_RUN="${ALL_SHOULD_ALSO_RUN} icmp"

server_ICMPV6_ports="icmpv6/any"
client_ICMPV6_ports="any"

server_icmpv6_ports="${server_ICMPV6_ports}"
client_icmpv6_ports="${client_ICMPV6_ports}"

server_icp_ports="udp/3130"
client_icp_ports="3130"

server_ident_ports="tcp/113"
client_ident_ports="default"

server_imap_ports="tcp/143"
client_imap_ports="default"

server_imaps_ports="tcp/993"
client_imaps_ports="default"

server_irc_ports="tcp/6667"
client_irc_ports="default"
helper_irc="irc"
ALL_SHOULD_ALSO_RUN="${ALL_SHOULD_ALSO_RUN} irc"

server_isakmp_ports="udp/500"
client_isakmp_ports="any"

server_ipsecnatt_ports="udp/4500"
client_ipsecnatt_ports="any" 

server_jabber_ports="tcp/5222 tcp/5223"
client_jabber_ports="default"

server_jabberd_ports="tcp/5222 tcp/5223 tcp/5269"
client_jabberd_ports="default"

server_l2tp_ports="udp/1701"
client_l2tp_ports="any"

server_ldap_ports="tcp/389"
client_ldap_ports="default"

server_ldaps_ports="tcp/636"
client_ldaps_ports="default"

server_lpd_ports="tcp/515"
client_lpd_ports="any"

server_microsoft_ds_ports="tcp/445"
client_microsoft_ds_ports="default"

server_mms_ports="tcp/1755 udp/1755"
client_mms_ports="default"
helper_mms="mms"
# this will produce warnings on most distribution
# because the mms module is not there:
# ALL_SHOULD_ALSO_RUN="${ALL_SHOULD_ALSO_RUN} mms"

server_ms_ds_ports="${server_microsoft_ds_ports}"
client_ms_ds_ports="${client_microsoft_ds_ports}"

server_msnp_ports="tcp/6891"
client_msnp_ports="default"

server_msn_ports="tcp/1863 udp/1863"
client_msn_ports="default"

server_mysql_ports="tcp/3306"
client_mysql_ports="default"

server_netbackup_ports="tcp/13701 tcp/13711 tcp/13720 tcp/13721 tcp/13724 tcp/13782 tcp/13783"
client_netbackup_ports="any"

server_netbios_ns_ports="udp/137"
client_netbios_ns_ports="any"

server_netbios_dgm_ports="udp/138"
client_netbios_dgm_ports="any"

server_netbios_ssn_ports="tcp/139"
client_netbios_ssn_ports="default"

server_nntp_ports="tcp/119"
client_nntp_ports="default"

server_nntps_ports="tcp/563"
client_nntps_ports="default"

server_ntp_ports="udp/123 tcp/123"
client_ntp_ports="any"

server_nut_ports="tcp/3493 udp/3493"
client_nut_ports="default"

server_nxserver_ports="tcp/5000:5200"
client_nxserver_ports="default"

server_openvpn_ports="tcp/1194 udp/1194"
client_openvpn_ports="default"

server_oracle_ports="tcp/1521"
client_oracle_ports="default"

server_OSPF_ports="89/any"
client_OSPF_ports="any"

server_pop3_ports="tcp/110"
client_pop3_ports="default"

server_pop3s_ports="tcp/995"
client_pop3s_ports="default"

# Portmap clients appear to use ports bellow 1024
server_portmap_ports="udp/111 tcp/111"
client_portmap_ports="any"

server_postgres_ports="tcp/5432"
client_postgres_ports="default"

server_pptp_ports="tcp/1723"
client_pptp_ports="default"
helper_pptp="pptp proto_gre"
# ALL_SHOULD_ALSO_RUN="${ALL_SHOULD_ALSO_RUN} pptp"

server_privoxy_ports="tcp/8118"
client_privoxy_ports="default"

server_radius_ports="udp/1812 udp/1813"
client_radius_ports="default"

server_radiusproxy_ports="udp/1814"
client_radiusproxy_ports="default"

server_radiusold_ports="udp/1645 udp/1646"
client_radiusold_ports="default"

server_radiusoldproxy_ports="udp/1647"
client_radiusoldproxy_ports="default"

server_rdp_ports="tcp/3389"
client_rdp_ports="default"

server_rndc_ports="tcp/953"
client_rndc_ports="default"

server_rsync_ports="tcp/873 udp/873"
client_rsync_ports="default"

server_rtp_ports="udp/10000:20000"
client_rtp_ports="any"

server_sane_ports="tcp/6566"
client_sane_ports="default"
helper_sane="sane"

server_sip_ports="udp/5060"
client_sip_ports="5060 default"
helper_sip="sip"

server_socks_ports="tcp/1080 udp/1080"
client_socks_ports="default"

server_squid_ports="tcp/3128"
client_squid_ports="default"

server_smtp_ports="tcp/25"
client_smtp_ports="default"

server_smtps_ports="tcp/465"
client_smtps_ports="default"

server_snmp_ports="udp/161"
client_snmp_ports="default"

server_snmptrap_ports="udp/162"
client_snmptrap_ports="any"

server_nrpe_ports="tcp/5666"
client_nrpe_ports="default"

server_ssh_ports="tcp/22"
client_ssh_ports="default"

server_stun_ports="udp/3478 udp/3479"
client_stun_ports="any"

server_submission_ports="tcp/587"
client_submission_ports="default"

server_sunrpc_ports="${server_portmap_ports}"
client_sunrpc_ports="${client_portmap_ports}"

server_swat_ports="tcp/901"
client_swat_ports="default"

server_syslog_ports="udp/514"
client_syslog_ports="syslog default"

server_telnet_ports="tcp/23"
client_telnet_ports="default"

server_tftp_ports="udp/69"
client_tftp_ports="default"
helper_tftp="tftp"

server_tomcat_ports="${server_httpalt_ports}"
client_tomcat_ports="${client_httpalt_ports}"

server_time_ports="tcp/37 udp/37"
client_time_ports="default"

server_upnp_ports="udp/1900 tcp/2869"
client_upnp_ports="default"

server_uucp_ports="tcp/540"
client_uucp_ports="default"

server_whois_ports="tcp/43"
client_whois_ports="default"

server_vmware_ports="tcp/902"
client_vmware_ports="default"

server_vmwareauth_ports="tcp/903"
client_vmwareauth_ports="default"

server_vmwareweb_ports="tcp/8222 tcp/8333"
client_vmwareweb_ports="default"

server_vnc_ports="tcp/5900:5903"
client_vnc_ports="default"

server_webcache_ports="${server_httpalt_ports}"
client_webcache_ports="${client_httpalt_ports}"

server_webmin_ports="tcp/10000"
client_webmin_ports="default"

server_xdmcp_ports="udp/177"
client_xdmcp_ports="default"


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# COMPLEX SERVICES DEFINITIONS
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
# The following are definitions for complex services.
# We define as "complex" the services that are implemented using multiple sockets.

# Each function bellow is organized in three parts:
# 1) A Header, common to each and every function
# 2) The rules required for the INPUT of the server
# 3) The rules required for the OUTPUT of the server
#
# The Header part, together with the "reverse" keyword can reverse the rules so
# that if we are implementing a client the INPUT will become OUTPUT and vice versa.
#
# In most the cases the input and output rules are the same with the following
# differences:
#
# a) The output rules begin with the "reverse" keyword, which reverses:
#    inface/outface, src/dst, sport/dport
# b) The output rules use ${out}_${mychain} instead of ${in}_${mychain}
# c) The state rules match the client operation, not the server.

# --- ICMP (v4/v6) helper functions --------------------------------------------

add_icmp_rule_pair() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	local request="${1}"; shift
	local response="${1}"; shift

	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi

	# allow incoming new and established packets
	rule ${in} action "$@" chain "${in}_${mychain}" proto icmp custom "--icmp-type $request" state NEW,ESTABLISHED || return 1

	# allow outgoing established packets
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto icmp custom "--icmp-type $response" state ESTABLISHED || return 1

	return 0
}

add_icmpv6_rule_pair() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	local request="${1}"; shift
	local response="${1}"; shift

	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi

	# allow incoming new and established packets
	rule ${in} action "$@" chain "${in}_${mychain}" proto icmpv6 custom "--icmpv6-type $request" state NEW,ESTABLISHED || return 1

	# allow outgoing established packets
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto icmpv6 custom "--icmpv6-type $response" state ESTABLISHED || return 1

	return 0
}

add_icmpv6_rule_pair_stateless() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	local icmpv6in="${1}"; shift
	local icmpv6out="${1}"; shift

	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi

	rule ${in} action "$@" chain "${in}_${mychain}" proto icmpv6 custom "--icmpv6-type $icmpv6in" || return 1

	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto icmpv6 custom "--icmpv6-type $icmpv6out" || return 1

	return 0
}

add_icmpv6_rule_error() {
	# Unlike stateful and stateless icmpv6 packets, for a server
        # or client we do the same thing:
	#   ingress error packets allowed if we think we have a connection
	#   egress error packets allowed whatever
        #  Possibly we could restrict the whatever to be related also?
        local mychain="${1}"; shift
	local type="${1}"; shift
	local icmpv6error="${1}"; shift

	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi

	rule ${in} reverse action "$@" chain "${in}_${mychain}" proto icmpv6 custom "--icmpv6-type $icmpv6error" state ESTABLISHED,RELATED || return 1
	rule ${out} action "$@" chain "${out}_${mychain}" proto icmpv6 custom "--icmpv6-type $icmpv6error" || return 1

	return 0
}

# --- XBOX ---------------------------------------------------------------------

# Contributed by andrex@alumni.utexas.net
# Following is the (complex) service definition function for xbox, the Xbox live
# service.  With this definition our Xbox connects and plays from behind a NAT
# firewall with no trouble.  Andrew.

rules_xbox() {
	local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	set_work_function "Setting up rules for Xbox live"
	
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto udp dport "88 3074" sport "${client_ports}" state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto udp dport "88 3074" sport "${client_ports}" state     ESTABLISHED || return 1
	
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto tcp dport 3074 sport "${client_ports}" state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto tcp dport 3074 sport "${client_ports}" state     ESTABLISHED || return 1
	
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto udp sport 3074 dport "${client_ports}" state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto udp sport 3074 dport "${client_ports}" state     ESTABLISHED || return 1
	
	return 0
}


# --- DHCP --------------------------------------------------------------------

rules_dhcp() {
        local mychain="${1}"; shift
	local type="${1}"; shift

	if ! push_namespace ipv4; then return 1; fi
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	set_work_function "Setting up rules for DHCP (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "udp" sport "68" dport "67" || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "udp" sport "68" dport "67" || return 1
	
	pop_namespace
	return 0
}

rules_dhcpv6() {
        local mychain="${1}"; shift
	local type="${1}"; shift

	if ! push_namespace ipv6; then return 1; fi

	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi

	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi

	# ----------------------------------------------------------------------

	set_work_function "Setting up rules for DHCPv6 (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "udp" dport "547" || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "udp" sport "546" || return 1

	pop_namespace
	return 0
}


# --- EMULE --------------------------------------------------------------------

rules_emule() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	# allow incomming to server tcp/4662
	set_work_function "Setting up rules for EMULE/client-to-server tcp/4662 (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "tcp" sport any dport 4662 state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "tcp" sport any dport 4662 state ESTABLISHED     || return 1
	
	# allow outgoing to client tcp/4662
	set_work_function "Setting up rules for EMULE/server-to-client tcp/4662 (${type})"
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "tcp" dport any sport 4662 state NEW,ESTABLISHED || return 1
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "tcp" dport any sport 4662 state ESTABLISHED     || return 1
	
	# allow incomming to server udp/4672
	set_work_function "Setting up rules for EMULE/client-to-server udp/4672 (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "udp" sport any dport 4672 state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "udp" sport any dport 4672 state ESTABLISHED     || return 1
	
	# allow outgoing to client udp/4672
	set_work_function "Setting up rules for EMULE/server-to-client udp/4672 (${type})"
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "udp" dport any sport 4672 state NEW,ESTABLISHED || return 1
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "udp" dport any sport 4672 state ESTABLISHED     || return 1
	
	# allow incomming to server tcp/4661
	set_work_function "Setting up rules for EMULE/client-to-server tcp/4661 (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "tcp" sport any dport 4661 state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "tcp" sport any dport 4661 state ESTABLISHED     || return 1
	
	# allow incomming to server udp/4665
	set_work_function "Setting up rules for EMULE/client-to-server udp/4665 (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "udp" sport any dport 4665 state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "udp" sport any dport 4665 state ESTABLISHED     || return 1
	
	return 0
}


# --- HYLAFAX ------------------------------------------------------------------
# Written by: Franscisco Javier Felix <ffelix@gescosoft.com>

rules_hylafax() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	# allow incomming to server tcp/4559
	set_work_function "Setting up rules for HYLAFAX/client-to-server tcp/4559 (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "tcp" sport any dport 4559 state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "tcp" sport any dport 4559 state ESTABLISHED     || return 1
	
	# allow outgoing to client from server tcp/4558
	set_work_function "Setting up rules for HYLAFAX/server-to-client from server tcp/4558 (${type})"
	rule ${out}        action "$@" chain "${out}_${mychain}" proto "tcp" sport 4558 dport any state NEW,ESTABLISHED || return 1
        rule ${in} reverse action "$@" chain "${in}_${mychain}"  proto "tcp" sport 4558 dport any state ESTABLISHED     || return 1
	
	return 0
}


# --- SAMBA --------------------------------------------------------------------

rules_samba() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	set_work_function "Setting up rules for SAMBA/NETBIOS-NS (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "udp" sport "137 ${client_ports}"  dport 137 state NEW,ESTABLISHED || return 1
	
	# NETBIOS initiates based on the broadcast address of an interface
	# (request goes to broadcast address) but the server responds from
	# its own IP address. This makes the server samba accept statement
	# drop the server reply.
	# Bellow is a hack, that allows a linux samba server to respond
	# correctly, as it allows new outgoing connections from the well
	# known netbios-ns port to the clients high ports.
	# For clients and routers this hack is not applied because it
	# would be a huge security hole.
	if [ "${type}" = "server" -a "${work_cmd}" = "interface" ]
	then
		rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "udp" sport "137 ${client_ports}"  dport 137 state NEW,ESTABLISHED || return 1
	else
		rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "udp" sport "137 ${client_ports}"  dport 137 state ESTABLISHED     || return 1
	fi
	
	set_work_function "Setting up rules for SAMBA/NETBIOS-DGM (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "udp" sport "138 ${client_ports}" dport 138 state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "udp" sport "138 ${client_ports}" dport 138 state ESTABLISHED     || return 1
	
	set_work_function "Setting up rules for SAMBA/NETBIOS-SSN (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "tcp" sport "${client_ports}" dport 139 state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "tcp" sport "${client_ports}" dport 139 state ESTABLISHED     || return 1
	
	set_work_function "Setting up rules for SAMBA/MICROSOFT_DS (${type})"
	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "tcp" sport "${client_ports}" dport 445 state NEW,ESTABLISHED || return 1
	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "tcp" sport "${client_ports}" dport 445 state ESTABLISHED     || return 1
	
	return 0
}


# --- PPTP --------------------------------------------------------------------
# THIS IS OLD
# THE NEW ONE USES THE KERNEL HELPER TO DO IT, AND THEREFORE IS A SIMPLE SERVICE
#
#rules_pptp() {
#        local mychain="${1}"; shift
#	local type="${1}"; shift
#	
#	local in=in
#	local out=out
#	if [ "${type}" = "client" ]
#	then
#		in=out
#		out=in
#	fi
#	
#	local client_ports="${DEFAULT_CLIENT_PORTS}"
#	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
#	then
#		client_ports="${LOCAL_CLIENT_PORTS}"
#	fi
#	
#	# ----------------------------------------------------------------------
#	
#	set_work_function "Setting up rules for PPTP/initial connection (${type})"
#	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "tcp" sport "${client_ports}" dport "1723" state NEW,ESTABLISHED || return 1
#	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "tcp" sport "${client_ports}" dport "1723" state ESTABLISHED     || return 1
#	
#	set_work_function "Setting up rules for PPTP/tunnel GRE traffic (${type})"
#	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "47"	|| return 1
#	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "47"	|| return 1
#	
#	return 0
#}


# --- NFS ----------------------------------------------------------------------

rules_nfs() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	# This command requires in the client or route subcommands,
	# the first argument after the policy/action is a dst.
	
	local action="${1}"; shift
	local servers="localhost"
	
	if [ "${type}" = "client" -o ! "${work_cmd}" = "interface" ]
	then
		case "${1}" in
			dst|DST|destination|DESTINATION)
				shift
				local servers="${1}"
				shift
				;;
				
			*)
				error "Please re-phrase to: ${type} nfs ${action} dst <NFS_SERVER> [other rules]"
				return 1
				;;
		esac
	fi
	
	local x=
	for x in ${servers}
	do
		local tmp="`${MKTEMP_CMD} ${FIREHOL_DIR}/firehol-rpcinfo-XXXXXXXXXX`"
		
		set_work_function "Getting RPC information from server '${x}'"
		
		rpcinfo -p ${x} >"${tmp}"
		if [ $? -gt 0 -o ! -s "${tmp}" ]
		then
			error "Cannot get rpcinfo from host '${x}' (using the previous firewall rules)"
			${RM_CMD} -f "${tmp}"
			return 1
		fi
		
		local server_rquotad_ports="`${CAT_CMD} "${tmp}" | ${GREP_CMD} " rquotad$"  | ( while read a b proto port s; do echo "$proto/$port"; done ) | ${SORT_CMD} | ${UNIQ_CMD}`"
		local server_mountd_ports="`${CAT_CMD} "${tmp}" | ${GREP_CMD} " mountd$"  | ( while read a b proto port s; do echo "$proto/$port"; done ) | ${SORT_CMD} | ${UNIQ_CMD}`"
		local server_lockd_ports="`${CAT_CMD} "${tmp}" | ${GREP_CMD} " nlockmgr$" | ( while read a b proto port s; do echo "$proto/$port"; done ) | ${SORT_CMD} | ${UNIQ_CMD}`"
		local server_statd_ports="`${CAT_CMD} "${tmp}" | ${GREP_CMD} " status$" | ( while read a b proto port s; do echo "$proto/$port"; done ) | ${SORT_CMD} | ${UNIQ_CMD}`"
		local server_nfsd_ports="`${CAT_CMD} "${tmp}" | ${GREP_CMD} " nfs$"       | ( while read a b proto port s; do echo "$proto/$port"; done ) | ${SORT_CMD} | ${UNIQ_CMD}`"
		
		test -z "${server_mountd_ports}" && error "Cannot find mountd ports for nfs server '${x}'" && return 1
		test -z "${server_lockd_ports}"  && error "Cannot find lockd ports for nfs server '${x}'" && return 1
		test -z "${server_statd_ports}"  && error "Cannot find statd ports for nfs server '${x}'" && return 1
		test -z "${server_nfsd_ports}"   && error "Cannot find nfsd ports for nfs server '${x}'" && return 1
		
		local dst=
		if [ ! "${x}" = "localhost" ]
		then
			dst="dst ${x}"
		fi
		
		if [ ! -z "${server_rquotad_ports}" ]
		then
			set_work_function "Processing rquotad rules for server '${x}'"
			rules_custom "${mychain}" "${type}" nfs-rquotad "${server_rquotad_ports}" "500:65535" "${action}" $dst "$@"
		fi
		
		set_work_function "Processing mountd rules for server '${x}'"
		rules_custom "${mychain}" "${type}" nfs-mountd "${server_mountd_ports}" "500:65535" "${action}" $dst "$@"
		
		set_work_function "Processing lockd rules for server '${x}'"
		rules_custom "${mychain}" "${type}" nfs-lockd "${server_lockd_ports}" "500:65535" "${action}" $dst "$@"

		set_work_function "Processing statd rules for server '${x}'"
		rules_custom "${mychain}" "${type}" nfs-statd "${server_statd_ports}" "500:65535" "${action}" $dst "$@"
		
		set_work_function "Processing nfsd rules for server '${x}'"
		rules_custom "${mychain}" "${type}" nfs-nfsd   "${server_nfsd_ports}"   "500:65535" "${action}" $dst "$@"
		
		${RM_CMD} -f "${tmp}"
		
		echo >&2 ""
		echo >&2 "WARNING:"
		echo >&2 "This firewall must be restarted if NFS server ${x} is restarted!"
		echo >&2 ""
	done
	
	return 0
}


# --- NIS ----------------------------------------------------------------------
# These rules work for client access only!
#
# Pushing changes to slave servers won't work if these rules are active
# somewhere between the master and its slaves, because it is impossible to
# predict the ports where "yppush" will be listening on each push.
#
# Pulling changes directly on the slaves will work, and could be improved
# performance-wise if these rules are modified to open "fypxfrd". This wasn't
# done because it doesn't make that much sense since pushing changes on the
# master server is the most common, and recommended, way to replicate maps.
#
# Created by Carlos Rodrigues <crlf@users.sourceforge.net>
# Feature Requests item #1050951 <https://sourceforge.net/tracker/?func=detail&atid=487695&aid=1050951&group_id=58425>

rules_nis() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	# This command requires in the client or route subcommands,
	# the first argument after the policy/action is a dst.
	
	local action="${1}"; shift
	local servers="localhost"
	
	if [ "${type}" = "client" -o ! "${work_cmd}" = "interface" ]
	then
		case "${1}" in
			dst|DST|destination|DESTINATION)
				shift
				local servers="${1}"
				shift
				;;
				
			*)
				error "Please re-phrase to: ${type} nis ${action} dst <NIS_SERVER> [other rules]"
				return 1
				;;
		esac
	fi
	
	local x=
	for x in ${servers}
	do
		local tmp="`${MKTEMP_CMD} ${FIREHOL_DIR}/firehol-rpcinfo-XXXXXXXXXX)`"
		
		set_work_function "Getting RPC information from server '${x}'"
		
		rpcinfo -p ${x} >"${tmp}"
		if [ $? -gt 0 -o ! -s "${tmp}" ]
		then
			error "Cannot get rpcinfo from host '${x}' (using the previous firewall rules)"
			${RM_CMD} -f "${tmp}"
			return 1
		fi
		
		local server_ypserv_ports="`${CAT_CMD} "${tmp}" | ${GREP_CMD} " ypserv$"  | ( while read a b proto port s; do echo "$proto/$port"; done ) | ${SORT_CMD} | ${UNIQ_CMD}`"
		local server_yppasswdd_ports="`${CAT_CMD} "${tmp}" | ${GREP_CMD} " yppasswdd$"  | ( while read a b proto port s; do echo "$proto/$port"; done ) | ${SORT_CMD} | ${UNIQ_CMD}`"
		
		test -z "${server_ypserv_ports}" && error "Cannot find ypserv ports for nis server '${x}'" && return 1
		
		local dst=
		if [ ! "${x}" = "localhost" ]
		then
			dst="dst ${x}"
		fi
		
		if [ ! -z "${server_yppasswdd_ports}" ]
		then
			set_work_function "Processing yppasswd rules for server '${x}'"
			rules_custom "${mychain}" "${type}" nis-yppasswd "${server_yppasswdd_ports}" "500:65535" "${action}" $dst "$@"
		fi
		
		set_work_function "Processing ypserv rules for server '${x}'"
		rules_custom "${mychain}" "${type}" nis-ypserv "${server_ypserv_ports}" "500:65535" "${action}" $dst "$@"
		
		${RM_CMD} -f "${tmp}"
		
		echo >&2 ""
		echo >&2 "WARNING:"
		echo >&2 "This firewall must be restarted if NIS server ${x} is restarted!"
		echo >&2 ""
	done
	
	return 0
}


# --- AMANDA -------------------------------------------------------------------
# THIS IS OLD
# THE NEW ONE USES THE KERNEL HELPER TO DO IT, AND THEREFORE IS A SIMPLE SERVICE
#
#FIREHOL_AMANDA_PORTS="850:859"
#
#rules_amanda() {
#	local mychain="${1}"; shift
#	local type="${1}"; shift
#	
#	local in=in
#	local out=out
#	if [ "${type}" = "client" ]
#	then
#		in=out
#		out=in
#	fi
#	
#	local client_ports="${DEFAULT_CLIENT_PORTS}"
#	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
#	then
#		client_ports="${LOCAL_CLIENT_PORTS}"
#	fi
#	
#	# ----------------------------------------------------------------------
#	
#	set_work_function "*** AMANDA: See http://amanda.sourceforge.net/fom-serve/cache/139.html"
#	
#	
#	set_work_function "Setting up rules for initial amanda server-to-client connection"
#	rule ${out}        action "$@" chain "${out}_${mychain}" proto "udp" dport 10080 state NEW,ESTABLISHED || return 1
#	rule ${in} reverse action "$@" chain "${in}_${mychain}"  proto "udp" dport 10080 state ESTABLISHED     || return 1
#	
#	
#	set_work_function "Setting up rules for amanda data exchange client-to-server"
#	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "tcp udp" dport "${FIREHOL_AMANDA_PORTS}" state NEW,ESTABLISHED || return 1
#	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "tcp udp" dport "${FIREHOL_AMANDA_PORTS}" state ESTABLISHED     || return 1
#	
#	return 0
#}

# --- FTP ----------------------------------------------------------------------
# THIS IS OLD
# THE NEW ONE USES THE KERNEL HELPER TO DO IT, AND THEREFORE IS A SIMPLE SERVICE
#
#ALL_SHOULD_ALSO_RUN="${ALL_SHOULD_ALSO_RUN} ftp"
#
#rules_ftp() {
#        local mychain="${1}"; shift
#	local type="${1}"; shift
#	
#	local in=in
#	local out=out
#	if [ "${type}" = "client" ]
#	then
#		in=out
#		out=in
#	fi
#	
#	local client_ports="${DEFAULT_CLIENT_PORTS}"
#	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
#	then
#		client_ports="${LOCAL_CLIENT_PORTS}"
#	fi
#	
#	# For an explanation of how FTP connections work, see
#	# http://slacksite.com/other/ftp.html
#	
#	# ----------------------------------------------------------------------
#	
#	# allow new and established incoming, and established outgoing
#	# accept port ftp new connections
#	set_work_function "Setting up rules for initial FTP connection ${type}"
#	rule ${in}          action "$@" chain "${in}_${mychain}"  proto tcp sport "${client_ports}" dport ftp state NEW,ESTABLISHED || return 1
#	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto tcp sport "${client_ports}" dport ftp state ESTABLISHED     || return 1
#	
#	set_work_function "Match anything related to the kernel ftp helper"
#	rule ${in}          action "$@" chain "${in}_${mychain}"  custom "-m helper --helper ftp" state ESTABLISHED,RELATED || return 1
#	rule ${out} reverse action "$@" chain "${out}_${mychain}" custom "-m helper --helper ftp" state ESTABLISHED,RELATED || return 1
#	
# this is old code - replaced by the two helper statements above
#	# Active FTP
#	# send port ftp-data related connections
#	set_work_function "Setting up rules for Active FTP ${type}"
#	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto tcp sport "${client_ports}" dport ftp-data state ESTABLISHED,RELATED || return 1
#	rule ${in}          action "$@" chain "${in}_${mychain}"  proto tcp sport "${client_ports}" dport ftp-data state ESTABLISHED         || return 1
#	
#	# ----------------------------------------------------------------------
#	
#	# A hack for Passive FTP only
#	local s_client_ports="${DEFAULT_CLIENT_PORTS}"
#	local c_client_ports="${DEFAULT_CLIENT_PORTS}"
#	
#	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
#	then
#		c_client_ports="${LOCAL_CLIENT_PORTS}"
#	elif [ "${type}" = "server" -a "${work_cmd}" = "interface" ]
#	then
#		s_client_ports="${LOCAL_CLIENT_PORTS}"
#	fi
#	
#	# Passive FTP
#	# accept high-ports related connections
#	set_work_function "Setting up rules for Passive FTP ${type}"
#	rule ${in}          action "$@" chain "${in}_${mychain}"  proto tcp sport "${c_client_ports}" dport "${s_client_ports}" state ESTABLISHED,RELATED || return 1
#	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto tcp sport "${c_client_ports}" dport "${s_client_ports}" state ESTABLISHED         || return 1
#	
#	require_kernel_module nf_conntrack_ftp
#	test ${FIREHOL_NAT} -eq 1 && require_kernel_module nf_nat_ftp
#	
#	return 0
#}


# --- TFTP ---------------------------------------------------------------------
# THIS IS OLD
# THE NEW ONE USES THE KERNEL HELPER TO DO IT, AND THEREFORE IS A SIMPLE SERVICE
#
# Written by: Goetz Bock <bock@blacknet.de>
#
#rules_tftp() {
#	local mychain="${1}"; shift
#	local type="${1}"; shift
#	
#	local in=in
#	local out=out
#	if [ "${type}" = "client" ]
#	then
#		in=out
#		out=in
#	fi
#	
#	local client_ports="${DEFAULT_CLIENT_PORTS}"
#	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
#	then
#		client_ports="${LOCAL_CLIENT_PORTS}"
#	fi
#	
#	# ---------------------------------------------------------------------
#	# TFTP is a broken protokol. It works like this:
#	#
#	# 1. The client sends from a high port (a) to the server's tftp port an
#	#    udp packet with "give me file 'bla'".
#	#
#	# 2. The server replies from a high port (b) to the highport the client
#	#    used (a) with "this is part 0 if your file"
#	#
#	# 3. The client now has to send a reply (from his highport a) to the
#	#    servers high port (b): "got part 0, send next part 1".
#	#
#	# 4. repeat 2. and 3. till file transmitted
#	
#	# allow the initial TFTP connection
#	set_work_function "Setting up rules for initial TFTP connection (${type})"
#	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "udp" sport "${client_ports}" dport tftp state NEW,ESTABLISHED || return 1
##	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "udp" sport "${client_ports}" dport tftp state ESTABLISHED     || return 1
#	
#	# We now need both server and client port ranges
#	local s_client_ports="${DEFAULT_CLIENT_PORTS}"
#	local c_client_ports="${DEFAULT_CLIENT_PORTS}"
#	
#	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
#	then
#		c_client_ports="${LOCAL_CLIENT_PORTS}"
#	elif [ "${type}" = "server" -a "${work_cmd}" = "interface" ]
#	then
#		s_client_ports="${LOCAL_CLIENT_PORTS}"
#	fi
#	
#	# allow the TFTP server to establish a new connection to the client
#	set_work_function "Setting up rules for server-to-client TFTP connection (${type})"
#	rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "udp" sport "${c_client_ports}" dport "${s_client_ports}" state RELATED,ESTABLISHED || return 1
#	rule ${in}          action "$@" chain "${in}_${mychain}"  proto "udp" sport "${c_client_ports}" dport "${s_client_ports}" state ESTABLISHED         || return 1
#	
#	require_kernel_module nf_conntrack_tftp
#	test ${FIREHOL_NAT} -eq 1 && require_kernel_module nf_nat_tftp
#	
#	return 0
#}


# --- PING ---------------------------------------------------------------------

rules_ping() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	if running_ipv4; then
		ipv4 add_icmp_rule_pair $mychain $type echo-request echo-reply "$@" || return 1
	fi
	if running_ipv6; then
		ipv6 add_icmpv6_rule_pair $mychain $type echo-request echo-reply "$@" || return 1
	fi
	
	return 0
}

# --- TIMESTAMP ----------------------------------------------------------------

rules_timestamp() {
        local mychain="${1}"; shift
	local type="${1}"; shift

	if ! push_namespace ipv4; then return 1; fi
	local status=0

	add_icmp_rule_pair $mychain $type timestamp-request timestamp-reply "$@"|| status=1
	
	pop_namespace
	return $status
}

# --- IVP6NEIGH ----------------------------------------------------------------

rules_ipv6neigh() {
        local mychain="${1}"; shift
	local type="${1}"; shift

	if ! push_namespace ipv6; then return 1; fi
	local status=0

	add_icmpv6_rule_pair_stateless $mychain $type neighbour-solicitation neighbour-advertisement "$@" || status=1

	pop_namespace
	return $status
}

# --- IVP6ROUTER ---------------------------------------------------------------

rules_ipv6router() {
        local mychain="${1}"; shift
	local type="${1}"; shift

	if ! push_namespace ipv6; then return 1; fi
	local status=0

	add_icmpv6_rule_pair_stateless $mychain $type router-solicitation router-advertisement "$@" || status=1

	pop_namespace
	return $status
}

# --- IVP6ERROR ----------------------------------------------------------------

rules_ipv6error() {
        local mychain="${1}"; shift
	local type="${1}"; shift

	if ! push_namespace ipv6; then return 1; fi

	for icmptype in destination-unreachable \
			packet-too-big \
			ttl-zero-during-transit \
			ttl-zero-during-reassembly \
			unknown-header-type \
			unknown-option
	do
		add_icmpv6_rule_error $mychain $type $icmptype "$@"
		if [ $? -ne 0 ]
		then
			pop_namespace
			return 1
		fi
	done

	pop_namespace
	return 0
}

# --- ALL ----------------------------------------------------------------------

rules_all() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	# allow new and established incoming packets
	rule ${in} action "$@" chain "${in}_${mychain}" state NEW,ESTABLISHED || return 1
	
	# allow outgoing established packets
	rule ${out} reverse action "$@" chain "${out}_${mychain}" state ESTABLISHED || return 1
	
	local ser=
	for ser in ${ALL_SHOULD_ALSO_RUN}
	do
		"${type}" ${ser} "$@" || return 1
	done
	
	return 0
}


# --- ANY ----------------------------------------------------------------------

rules_any() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	local name="${1}"; shift # a special case: service any gets a name
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	# allow new and established incoming packets
	rule ${in} action "$@" chain "${in}_${mychain}" state NEW,ESTABLISHED || return 1
	
	# allow outgoing established packets
	rule ${out} reverse action "$@" chain "${out}_${mychain}" state ESTABLISHED || return 1
	
	return 0
}


# --- ANYSTATELESS -------------------------------------------------------------

rules_anystateless() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	local name="${1}"; shift # a special case: service any gets a name
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	# allow new and established incoming packets
	rule ${in} action "$@" chain "${in}_${mychain}" || return 1
	
	# allow outgoing established packets
	rule ${out} reverse action "$@" chain "${out}_${mychain}" || return 1
	
	return 0
}


# --- MULTICAST ----------------------------------------------------------------

rules_multicast() {
        local mychain="${1}"; shift
	local type="${1}"; shift
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	# match multicast packets in both directions
	rule ${out} action "$@" chain "${out}_${mychain}" dst "${MULTICAST_IPS}" proto 2 || return 1
	rule ${in} reverse action "$@" chain "${in}_${mychain}" src "${MULTICAST_IPS}" proto 2 || return 1
	
	rule ${out} action "$@" chain "${out}_${mychain}" dst "${MULTICAST_IPS}" proto udp || return 1
	rule ${in} reverse action "$@" chain "${in}_${mychain}" src "${MULTICAST_IPS}" proto udp || return 1
	
	return 0
}


# --- CUSTOM -------------------------------------------------------------------

rules_custom() {
	local mychain="${1}"; shift
	local type="${1}"; shift
	
	local server="${1}"; shift
	local my_server_ports="${1}"; shift
	local my_client_ports="${1}"; shift
	
	local helpers=
	if [ "$1" = "helpers" ]
	then
		local helpers="$2"
		shift 2
	fi
	
	local in=in
	local out=out
	if [ "${type}" = "client" ]
	then
		in=out
		out=in
	fi
	
	local client_ports="${DEFAULT_CLIENT_PORTS}"
	if [ "${type}" = "client" -a "${work_cmd}" = "interface" ]
	then
		client_ports="${LOCAL_CLIENT_PORTS}"
	fi
	
	# ----------------------------------------------------------------------
	
	local sp=
	for sp in ${my_server_ports}
	do
		local proto=
		local sport=
		
		IFS="/" read proto sport <<EOF
$sp
EOF
		
		local cp=
		for cp in ${my_client_ports}
		do
			local cport=
			case ${cp} in
				default)
					cport="${client_ports}"
					;;
					
				*)	cport="${cp}"
					;;
			esac
			
			set_work_function "Rules for ${server} ${type}, with server port(s) '${sp}' and client port(s) '${cp}'"
			
			# allow new and established incoming packets
			rule ${in} action "$@" chain "${in}_${mychain}" proto "${proto}" sport "${cport}" dport "${sport}" state NEW,ESTABLISHED || return 1
			
			# allow outgoing established packets
			rule ${out} reverse action "$@" chain "${out}_${mychain}" proto "${proto}" sport "${cport}" dport "${sport}" state ESTABLISHED || return 1
		done
	done
	
	local x=
	for x in ${helpers}
	do
		set_work_function "Rules for ${server} ${type}, with helper '${x}'"
		
		rule ${in}          action "$@" chain "${in}_${mychain}"  custom "-m helper --helper ${x}" state ESTABLISHED,RELATED || return 1
		rule ${out} reverse action "$@" chain "${out}_${mychain}" custom "-m helper --helper ${x}" state ESTABLISHED,RELATED || return 1
	done
	
	return 0
}


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# SUPPORT FOR EXTERNAL DEFINITIONS OF SERVICES
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

# Load all the services.
# All these files should start with: #FHVER: 1
cd "${FIREHOL_SERVICES_DIR}" || exit 1
for f in `ls *.conf 2>/dev/null`
do
	cd "${FIREHOL_SERVICES_DIR}" || exit 1
	
	if [ ! -O "${f}" ]
	then
		echo >&2 " >>> Ignoring service in '${FIREHOL_SERVICES_DIR}/${f}' because it is not owned by root."
		continue
	fi
	
	n=`"${HEAD_CMD}" -n 1 "${f}" | "${CUT_CMD}" -d ':' -f 2`
	"${EXPR_CMD}" ${n} + 0 >/dev/null 2>&1
	if [ $? -ne 0 ]
	then
		echo >&2 " >>> Ignoring service in '${FIREHOL_SERVICES_DIR}/${f}' due to malformed header."
	elif [ ${n} -ne ${FIREHOL_SERVICES_API} ]
	then
		echo >&2 " >>> Ignoring service '${FIREHOL_SERVICES_DIR}/${f}' due to incompatible API version."
	else
		n=`"${HEAD_CMD}" -n 1 "${f}" | "${CUT_CMD}" -d ':' -f 3`
		"${EXPR_CMD}" ${n} + 0 >/dev/null 2>&1
		if [ $? -ne 0 ]
		then
			echo >&2 " >>> Ignoring service in '${FIREHOL_SERVICES_DIR}/${f}' due to malformed API minor number."
		else
			source ${f}
			ret=$?
			if [ ${ret} -ne 0 ]
			then
				echo >&2 " >>> Service in '${FIREHOL_SERVICES_DIR}/${f}' returned code ${ret}."
				continue
			fi
		fi
	fi
done
cd "${FIREHOL_DEFAULT_WORKING_DIRECTORY}" || exit 1

# ------------------------------------------------------------------------------

# The caller may need just our services definitions
if [ "$1" = "gimme-the-services-defs" ]
then
	return 0
	exit 1
fi



# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# HELPER FUNCTIONS BELLOW THIS POINT
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

ecn_shame() {
	softwarning "ECN_SHAME IP list no longer available, helper is ignored."
	return 0
}

# define custom actions
action() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "$FUNCNAME cannot be used in '${work_cmd}'. Put it before any '${work_cmd}' definition."; return 1 )
	
	while [ ! -z "${1}" ]
	do
		local what="${1}"; shift
		
		case "${what}" in
			chain)	local name="${1}"; shift
				local act="${1}"; shift
				
				if [ -z "${name}" ]
				then
					error "Cannot create an action chain without a name."
					return 1
				fi
				
				if [ -z "${act}" ]
				then
					error "Cannot create the action chain(s) '$name' without a default action."
					return 1
				fi
				
				local nm=
				for nm in $name
				do
					create_chain filter ${nm}
					rule table filter chain ${nm} action "${act}"
				done
				;;
				
			*)	error "Cannot understand $FUNCNAME '${what}'."
				return 1
				;;
		esac
	done
	
	return 0
}

masquerade() {
	work_realcmd_helper ${FUNCNAME} "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	local f="${work_outface}"
	test "${1}" = "reverse" && f="${work_inface}" && shift
	
	test -z "${f}" && local f="${1}" && shift
	
	test -z "${f}" && error "masquerade requires an interface set or as argument" && return 1
	
	set_work_function "Initializing masquerade on interface '${f}'"
	
	rule noowner table nat chain POSTROUTING "$@" inface any outface "${f}" action MASQUERADE || return 1
	
	FIREHOL_NAT=1
	FIREHOL_ROUTING=1
	
	return 0
}

transparent_proxy_count=0
transparent_proxy() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "$FUNCNAME cannot be used in '${work_cmd}'. Put it before any '${work_cmd}' definition."; return 1 )
	
	local ports="${1}"; shift
	local redirect="${1}"; shift
	local user="${1}"; shift
	
	test -z "${redirect}" && error "Proxy listening port is empty" && return 1
	
	transparent_proxy_count=$[transparent_proxy_count + 1]
	
	set_work_function "Setting up rules for catching routed tcp/${ports} traffic"
	
	create_chain nat "in_trproxy.${transparent_proxy_count}" PREROUTING noowner "$@" outface any proto tcp sport "${DEFAULT_CLIENT_PORTS}" dport "${ports}" || return 1
#	rule table nat chain "in_trproxy.${transparent_proxy_count}" proto tcp dport "${ports}" action REDIRECT to-port ${redirect} || return 1
	rule table nat chain "in_trproxy.${transparent_proxy_count}" proto tcp action REDIRECT to-port ${redirect} || return 1
	
	if [ ! -z "${user}" ]
	then
		set_work_function "Setting up rules for catching outgoing tcp/${ports} traffic"
		create_chain nat "out_trproxy.${transparent_proxy_count}" OUTPUT "$@" uid not "${user}" nosoftwarnings inface any outface any src any proto tcp sport "${LOCAL_CLIENT_PORTS}" dport "${ports}" || return 1
		
		# do not catch traffic for localhost servers
		rule table nat chain "out_trproxy.${transparent_proxy_count}" dst "127.0.0.1" action RETURN || return 1
		
#		rule table nat chain "out_trproxy.${transparent_proxy_count}" proto tcp dport "${ports}" action REDIRECT to-port ${redirect} || return 1
		rule table nat chain "out_trproxy.${transparent_proxy_count}" proto tcp action REDIRECT to-port ${redirect} || return 1
	fi
	
	FIREHOL_NAT=1
	FIREHOL_ROUTING=1
	
	return 0
}

transparent_squid() {
	transparent_proxy 80 "$@"
}

FIREHOL_TPROXY_MARK="0xffff/0xffff"
FIREHOL_TPROXY_IP_ROUTE_TABLE="999"
FIREHOL_TPROXY_ROUTE_DEVICE="lo"

tproxy_setup_ip_route() {
	local x=
	for x in inet inet6
	do
		# remove the existing ip rules for this mark
		postprocess -ne ${IP_CMD} -f $x rule del from all fwmark $FIREHOL_TPROXY_MARK

		# remove the existing rules from the ip route table
		postprocess -ne ${IP_CMD} -f $x route flush table $FIREHOL_TPROXY_IP_ROUTE_TABLE

		# add the ip rule to match the mask and forward it to the proper ip route table for tproxy
		postprocess -warn ${IP_CMD} -f $x rule add from all fwmark $FIREHOL_TPROXY_MARK lookup $FIREHOL_TPROXY_IP_ROUTE_TABLE

		# add the route to forward all traffic to lo, on the ip route table for tproxy
		postprocess -warn ${IP_CMD} -f $x route add local default dev $FIREHOL_TPROXY_ROUTE_DEVICE table $FIREHOL_TPROXY_IP_ROUTE_TABLE
	done

	# disable the reverse path discovery for lo
	postprocess -warn ${SYSCTL_CMD} -w net.ipv4.conf.default.rp_filter=0
	postprocess -warn ${SYSCTL_CMD} -w net.ipv4.conf.all.rp_filter=0
	postprocess -warn ${SYSCTL_CMD} -w net.ipv4.conf.$FIREHOL_TPROXY_ROUTE_DEVICE.rp_filter=0
}

tproxy_count=0
tproxy() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "$FUNCNAME cannot be used in '${work_cmd}'. Put it before any '${work_cmd}' definition."; return 1 )
	
	local ports="${1}"; shift
	
	local tproxy_action_options="tproxy-mark $FIREHOL_TPROXY_MARK"
	local tport=
	local tip=

	if [ "$1" = "port" ]
	then
		local tproxy_action_options="$tproxy_action_options on-port ${2}"
		local tport="${2}"
		shift 2
	else
		error "TPROXY needs at least the port the proxy is listening at."
		return 1
	fi

	if [ "$1" = "ip" ]
	then
		local tproxy_action_options="$tproxy_action_options on-ip ${2}"
		local tip="${2}"
		shift 2
	fi
	
	tproxy_count=$[tproxy_count + 1]
	
	set_work_function "Setting up rules for catching routed tcp/${ports} traffic"
	
	create_chain mangle "in_tproxy.${tproxy_count}" PREROUTING "$@" outface any proto tcp dport "${ports}" || return 1

	create_chain mangle "in_tproxy.${tproxy_count}.divert" "in_tproxy.${tproxy_count}" proto tcp custom '-m socket' || return 1
	rule table mangle chain "in_tproxy.${tproxy_count}.divert" action MARK to $FIREHOL_TPROXY_MARK
	rule table mangle chain "in_tproxy.${tproxy_count}.divert" action ACCEPT

	rule table mangle chain "in_tproxy.${tproxy_count}" proto tcp action TPROXY ${tproxy_action_options} || return 1
	
	FIREHOL_NAT=1
	FIREHOL_ROUTING=1
	
	if [ $tproxy_count -eq 1 ]
	then
		tproxy_setup_ip_route
	fi

	return 0
}


nat_count=0
nat_helper() {
#	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "NAT cannot be used in '${work_cmd}'. Put all NAT related commands before any '${work_cmd}' definition."; return 1 )
	
	local type="${1}"; shift
	local to="${1}";   shift
	
	nat_count=$[nat_count + 1]
	
	set_work_function -ne "Setting up rules for NAT type: '${type}'"
	
	case ${type} in
		to-source)
			create_chain nat "nat.${nat_count}" POSTROUTING nolog "$@" inface any || return 1
			local action=snat
			;;
		
		to-destination)
			create_chain nat "nat.${nat_count}" PREROUTING noowner nolog "$@" outface any || return 1
			local action=dnat
			;;
			
		redirect-to)
			create_chain nat "nat.${nat_count}" PREROUTING noowner nolog "$@" outface any || return 1
			local action=redirect
			;;
			
		*)
			error "$FUNCNAME requires a type (i.e. to-source, to-destination, redirect-to, etc) as its first argument. '${type}' is not understood."
			return 1
			;;
	esac
	
	
	set_work_function "Taking the NAT action: '${action}'"
	
	# we now need to keep the protocol
	rule table nat chain "nat.${nat_count}" noowner "$@" action "${action}" to "${to}" nosoftwarnings src any dst any inface any outface any sport any dport any || return 1
	
	FIREHOL_NAT=1
	FIREHOL_ROUTING=1
	
	return 0
}

nat() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	nat_helper "$@"
}

snat() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	local to="${1}"; shift
	test "${to}" = "to" && local to="${1}" && shift
	
	nat_helper "to-source" "${to}" "$@"
}

dnat() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	local to="${1}"; shift
	test "${to}" = "to" && local to="${1}" && shift
	
	nat_helper "to-destination" "${to}" "$@"
}

redirect() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	local to="${1}"; shift
	test "${to}" = "to" -o "${to}" = "to-port" && local to="${1}" && shift
	
	nat_helper "redirect-to" "${to}" "$@"
}

wrongmac_chain=0
wrongmac6_chain=0
mac() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "$FUNCNAME cannot be used in '${work_cmd}'. Put it before any '${work_cmd}' definition."; return 1 )
	
	if running_ipv4; then
		if [ ${wrongmac_chain} -eq 0 ]
		then
			set_work_function "Creating the MAC-MISSMATCH chain (only once)"
		
			iptables -t filter -N WRONGMAC
			rule table filter chain WRONGMAC loglimit "MAC MISSMATCH" action DROP || return 1
		
			wrongmac_chain=1
		fi
	fi

	if running_ipv6; then
		if [ ${wrongmac6_chain} -eq 0 ]
		then
			set_work_function "Creating the MAC-MISSMATCH chain (only once)"

			ip6tables -t filter -N WRONGMAC
			rule table filter chain WRONGMAC loglimit "MAC MISSMATCH" action DROP || return 1

			wrongmac6_chain=1
		fi
	fi

	set_work_function "If the source IP ${1} does not match MAC ${2}, drop the packet"

	iptables_both -t filter -A INPUT   -s "${1}" -m mac ! --mac-source "${2}" -j WRONGMAC
	iptables_both -t filter -A FORWARD -s "${1}" -m mac ! --mac-source "${2}" -j WRONGMAC

	return 0
}

# blacklist creates two types of blacklists: unidirectional or bidirectional
blacklist_chain=0
blacklist() {
	work_realcmd_helper ${FUNCNAME} "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "$FUNCNAME cannot be used in '${work_cmd}'. Put it before any '${work_cmd}' definition."; return 1 )
	
	local full=1
	if [ "${1}" = "them" -o "${1}" = "him" -o "${1}" = "her" -o "${1}" = "it" -o "${1}" = "this" -o "${1}" = "these"  -o "${1}" = "input" ]
	then
		shift
		full=0
	elif [ "${1}" = "all" -o "${1}" = "full" ]
	then
		shift
		full=1
	fi
	
	if [ ${blacklist_chain} -eq 0 ]
	then
		set_work_function "Generating blacklist chains"
		
		# Blacklist INPUT unidirectional
		iptables_both -t filter -N BL_IN_UNI	# INPUT
		iptables_both -A BL_IN_UNI -m conntrack --ctstate NEW -j DROP
		iptables_both -A BL_IN_UNI -j DROP
		
		# No need for OUTPUT/FORWARD unidirectional
		
		# Blacklist INPUT bidirectional
		iptables_both -t filter -N BL_IN_BI	# INPUT
		iptables_both -A BL_IN_BI -m conntrack --ctstate NEW -j DROP
		iptables_both -A BL_IN_BI -j DROP
		
		# Blacklist OUTPUT/FORWARD bidirectional
		iptables_both -t filter -N BL_OUT_BI	# OUTPUT and FORWARD
		iptables_both -A BL_OUT_BI -m conntrack --ctstate NEW -p tcp -j REJECT #--reject-with tcp-reset
		if running_ipv4; then
			iptables -A BL_OUT_BI -m conntrack --ctstate NEW -j REJECT --reject-with icmp-host-unreachable
		fi
		if running_ipv6; then
			iptables -A BL_OUT_BI -m conntrack --ctstate NEW -j REJECT --reject-with icmp6-addr-unreachable
		fi

		iptables_both -A BL_OUT_BI -j REJECT
		
		blacklist_chain=1
	fi
	
	set_work_function "Generating blacklist rules"
	
	local z=
	for z in $@
	do
		local x=
		for x in ${z}
		do
			set_work_function "Blacklisting '${x}'"
			
			if [ ${full} -eq 1 ]
			then
				iptables_both -I INPUT   -s ${x} -j BL_IN_BI
				iptables_both -I FORWARD -s ${x} -j BL_IN_BI
				
				iptables_both -I OUTPUT  -d ${x} -j BL_OUT_BI
				iptables_both -I FORWARD -d ${x} -j BL_OUT_BI  
			else
				iptables_both -I INPUT   -s ${x} -j BL_IN_UNI
				iptables_both -I FORWARD -s ${x} -j BL_IN_UNI
			fi
		done
	done
	
	return 0
}

classify_count=0
classify() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "$FUNCNAME cannot be used in '${work_cmd}'. Put it before any '${work_cmd}' definition."; return 1 )
	
	local class="${1}"; shift
	classify_count=$[classify_count + 1]
	
	set_work_function "Setting up rules for CLASSIFY"
	
	create_chain mangle "classify.${classify_count}" POSTROUTING "$@" || return 1
	iptables_both -t mangle -A "classify.${classify_count}" -j CLASSIFY --set-class ${class}
	
	return 0
}

connmark_count=0
connmark() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "$FUNCNAME cannot be used in '${work_cmd}'. Put it before any '${work_cmd}' definition."; return 1 )
	
	local num="${1}"; shift
	local where="${1}"; shift
	test -z "${where}" && where="OUTPUT POSTROUTING"
	
	if [ $mark_count -gt 0 -a $connmark_count -eq 0 ]
	then
		softwarning "MARK and CONNMARK can interfere with each other. Check https://github.com/ktsaou/firehol/issues/23#issuecomment-37599754"
	fi
	
	connmark_count=$[connmark_count + 1]
	
	if [ "${num}" = "save" ]
	then
		# save MARK to CONNMARK
		shift 1
		rule table mangle chain INPUT       custom '-m conntrack --ctstate NEW' "$@" action CONNMARK save
		rule table mangle chain POSTROUTING custom '-m conntrack --ctstate NEW' "$@" action CONNMARK save
		return 0
	fi

	if [ "${num}" = "restore" ]
	then
		# backward compatibility - nothing to be done here
		return 0
	fi

	set_work_function "Setting up rules for CONNMARK rule No $connmark_count"
	
	local chain=
	for chain in ${where}
	do
		case "${chain}" in
			interface)
				create_chain mangle "connmark.inface.${connmark_count}" "PREROUTING" custom '-m conntrack --ctstate NEW' inface "$@" || return 1
				rule table mangle chain "connmark.inface.${connmark_count}" action CONNMARK to ${num}
				rule table mangle chain "connmark.inface.${connmark_count}" action CONNMARK restore

				create_chain mangle "connmark.outface.${connmark_count}" "POSTROUTING" custom '-m conntrack --ctstate NEW' outface "$@" || return 1
				rule table mangle chain "connmark.outface.${connmark_count}" action CONNMARK to ${num}
				rule table mangle chain "connmark.outface.${connmark_count}" action CONNMARK restore
				;;

			*)
				create_chain mangle "connmark.${chain}.${connmark_count}" "${chain}" custom '-m conntrack --ctstate NEW' "$@" || return 1
				rule table mangle chain "connmark.${chain}.${connmark_count}" action CONNMARK to ${num}
				rule table mangle chain "connmark.${chain}.${connmark_count}" action CONNMARK restore
				;;
		esac
	done

	return 0
}

mark_count=0
mark() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "$FUNCNAME cannot be used in '${work_cmd}'. Put it before any '${work_cmd}' definition."; return 1 )
	
	local num="${1}"; shift
	local where="${1}"; shift
	test -z "${where}" && where=OUTPUT
	
	if [ $mark_count -eq 0 -a $connmark_count -gt 0 ]
	then
		softwarning "MARK and CONNMARK can interfere with each other. Check https://github.com/ktsaou/firehol/issues/23#issuecomment-37599754"
	fi

	mark_count=$[mark_count + 1]
	
	set_work_function "Setting up rules for MARK"
	
	create_chain mangle "mark.${mark_count}" "${where}" "$@" || return 1
	iptables_both -t mangle -A "mark.${mark_count}" -j MARK --set-mark ${num}
	
	return 0
}

tos_count=0
tos() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "$FUNCNAME cannot be used in '${work_cmd}'. Put it before any '${work_cmd}' definition."; return 1 )
	
	local num="${1}"; shift
	local where="${1}"; shift
	test -z "${where}" && where=OUTPUT
	
	tos_count=$[tos_count + 1]
	
	set_work_function "Setting up rules for TOS"
	
	create_chain mangle "tos.${tos_count}" "${where}" "$@" || return 1
	iptables_both -t mangle -A "tos.${tos_count}" -j TOS --set-tos ${num}
	
	return 0
}

# from http://blog.edseek.com/~jasonb/articles/traffic_shaping/scenarios.html
tosfix() {
	work_realcmd=($FUNCNAME "$@")
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "$FUNCNAME cannot be used in '${work_cmd}'. Put it before any '${work_cmd}' definition."; return 1 )
	
	set_work_function "Fixing TOS for TCP ACK packets"
	
	iptables_both -t mangle -N ackfix
	iptables_both -t mangle -A ackfix -m tos ! --tos Normal-Service -j RETURN
	iptables_both -t mangle -A ackfix -p tcp -m length --length 0:128 -j TOS --set-tos Minimize-Delay
	iptables_both -t mangle -A ackfix -p tcp -m length --length 128: -j TOS --set-tos Maximize-Throughput
	iptables_both -t mangle -A ackfix -j RETURN
	iptables_both -t mangle -I POSTROUTING -p tcp -m tcp --tcp-flags SYN,RST,ACK ACK -j ackfix
	
	set_work_function "Fixing TOS for Minimize-Delay packets"
	
	iptables_both -t mangle -N tosfix
	iptables_both -t mangle -A tosfix -p tcp -m length --length 0:512 -j RETURN
	iptables_both -t mangle -A tosfix -m limit --limit 2/s --limit-burst 10 -j RETURN
	iptables_both -t mangle -A tosfix -j TOS --set-tos Maximize-Throughput
	iptables_both -t mangle -A tosfix -j RETURN
	iptables_both -t mangle -I POSTROUTING -p tcp -m tos --tos Minimize-Delay -j tosfix
	
	return 0
}

dscp_count=0
dscp() {
	work_realcmd=($FUNCNAME "$@")
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	require_work clear || ( error "$FUNCNAME cannot be used in '${work_cmd}'. Put it before any '${work_cmd}' definition."; return 1 )
	
	local value="${1}"; shift
	local class=""
	
	if [ "${value}" = "class" ]
	then
		local value=""
		local class="${1}"; shift
	fi
	
	local where="${1}"; shift
	test -z "${where}" && where=OUTPUT
	
	dscp_count=$[dscp_count + 1]
	
	set_work_function "Setting up rules for setting DSCP"
	
	create_chain mangle "dscp.${dscp_count}" "${where}" "$@" || return 1
	
	if [ ! -z "${class}" ]
	then
		iptables_both -t mangle -A "dscp.${dscp_count}" -j DSCP --set-dscp-class ${class}
	else
		iptables_both -t mangle -A "dscp.${dscp_count}" -j DSCP --set-dscp ${value}
	fi
	
	return 0
}

tcpmss() {
	work_realcmd_helper $FUNCNAME "$@"
	
	set_work_function -ne "Initializing $FUNCNAME"
	
	local value="$1"
	local iface="$2"
	
	if [ -z "$iface" ]
	then
		if [ ! -z "${work_cmd}" ]
		then
			local iface="${work_outface}"
			if [ -z "$iface" ]
			then
				error "$FUNCNAME cannot find the interfaces to setup. Did you set an outface?"
				return 1
			fi
			
		else
			local iface="all"
		fi
	fi
	
	local target=
	case "$value" in
		auto)
			local target="-j TCPMSS --clamp-mss-to-pmtu"
			;;
		
		[0-9]*)
			local target="-j TCPMSS --set-mss $value"
			;;
	
		*)
			;;
	esac
	
	if [ -z "$target" ]
	then
		error "$FUNCNAME requires either the word 'auto' or a numeric argument for mss."
		return 1
	fi
	
	if [ "$iface" = "all" ]
	then
		set_work_function "Initializing tcpmss for all interfaces"
		
		iptables_both -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN $target
	else
		local f=
		for f in $iface
		do
			set_work_function "Initializing tcpmss for interface '${f}'"
			iptables_both -t mangle -A POSTROUTING -o ${f} -p tcp --tcp-flags SYN,RST SYN $target
		done
	fi
	
	return 0
}


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# INTERNAL FUNCTIONS BELLOW THIS POINT - Primary commands
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------


# ------------------------------------------------------------------------------
# Check the version required by the configuration file
# WHY:
# We have to make sure the configuration file has been written for this version
# of FireHOL. Note that the version command does not actually check the version
# of firehol.sh. It checks only its config version number.

version() {
        work_realcmd_helper ${FUNCNAME} "$@"
	
	if [ ${1} -gt ${FIREHOL_VERSION} ]
	then
		error "Wrong version. FireHOL is v${FIREHOL_VERSION}, your script requires v${1}. See http://firehol.org/upgrade/#config-version-${FIREHOL_VERSION}"
	fi

	if [ ${1} -eq 5 ]
	then
		ENABLE_IPV6=0
		FIREHOL_DEFAULT_NAMESPACE=ipv4
		FIREHOL_NS_CURR=$FIREHOL_DEFAULT_NAMESPACE
		FIREHOL_NS_STACK=
		FIREHOL_NS_PREP=
		warning "Running version 5 config. Update configuration to version 6 for IPv6 support. See http://firehol.org/upgrade/#config-version-${FIREHOL_VERSION}"
	fi
}


# ------------------------------------------------------------------------------
# PRIMARY COMMAND: interface
# Setup rules specific to an interface (physical or logical)

interface() {
        work_realcmd_primary ${FUNCNAME} "$@"
	
	# --- close any open command ---
	
	close_cmd || return 1

	# --- reset namespace
	if [ "${FIREHOL_NS_PREP}" != "" ]
	then
		FIREHOL_NS_STACK=${FIREHOL_NS_PREP}
		FIREHOL_NS_CURR=${FIREHOL_NS_PREP}
	else
		FIREHOL_NS_STACK=${FIREHOL_DEFAULT_NAMESPACE}
		FIREHOL_NS_CURR=${FIREHOL_DEFAULT_NAMESPACE}
	fi
	FIREHOL_NS_PREP=

	# --- test prerequisites ---
	
	require_work clear || return 1
	set_work_function -ne "Initializing $FUNCNAME"
	
	
	# --- get paramaters and validate them ---
	
	# Get the interface
	local inface="${1}"; shift
	test -z "${inface}" && error "real interface is not set" && return 1
	
	# Get the name for this interface
	local name="${1}"; shift
	test -z "${name}" && error "$FUNCNAME name is not set" && return 1
	
	
	# --- do the job ---
	
	work_cmd="${FUNCNAME}"
	work_name="${name}"
	work_realcmd=("(unset)")
	
	set_work_function -ne "Initializing $FUNCNAME '${work_name}'"
	
	create_chain filter "in_${work_name}" INPUT in set_work_inface "$@" inface "${inface}" outface any || return 1
	create_chain filter "out_${work_name}" OUTPUT out set_work_outface reverse "$@" inface "${inface}" outface any || return 1
	
	return 0
}

interface4() {
	ipv4 interface "$@"
}

interface6() {
	ipv6 interface "$@"
}

interface46() {
	both interface "$@"
}


router() {
        work_realcmd_helper ${FUNCNAME} "$@"
	
	# --- close any open command ---
	
	close_cmd || return 1
	
	# --- reset namespace
	if [ "${FIREHOL_NS_PREP}" != "" ]
	then
		FIREHOL_NS_STACK=${FIREHOL_NS_PREP}
		FIREHOL_NS_CURR=${FIREHOL_NS_PREP}
	else
		FIREHOL_NS_STACK=${FIREHOL_DEFAULT_NAMESPACE}
		FIREHOL_NS_CURR=${FIREHOL_DEFAULT_NAMESPACE}
	fi
	FIREHOL_NS_PREP=

	# --- test prerequisites ---
	
	require_work clear || return 1
	set_work_function -ne "Initializing $FUNCNAME"
	
	
	# --- get paramaters and validate them ---
	
	# Get the name for this router
	local name="${1}"; shift
	test -z "${name}" && error "$FUNCNAME name is not set" && return 1
	
	
	# --- do the job ---
	
	work_cmd="${FUNCNAME}"
	work_name="${name}"
	work_realcmd=("(unset)")
	
	set_work_function -ne "Initializing $FUNCNAME '${work_name}'"
	
	create_chain filter "in_${work_name}" FORWARD in set_work_inface set_work_outface "$@" || return 1
	create_chain filter "out_${work_name}" FORWARD out reverse "$@" || return 1
	
	FIREHOL_ROUTING=1
	
	return 0
}

router4() {
	ipv4 router "$@"
}

router6() {
	ipv6 router "$@"
}

router46() {
	both router "$@"
}

save_for_restore() {
	local check="$1"; shift

	printf "%q " "$@" >>"${FIREHOL_DIR}/firewall_restore_commands.sh"

	if [ "${check}" = "none" -o "${check}" = "warn" ]
	then
		printf " || echo >/dev/null\n" >>"${FIREHOL_DIR}/firewall_restore_commands.sh"
	else
		printf " || exit 1\n" >>"${FIREHOL_DIR}/firewall_restore_commands.sh"
	fi
}

postprocess() {
#       work_realcmd_helper ${FUNCNAME} "$@"
	
	local check="error"
	local save=1
	while [ ! "A${1}" = "A" ]
	do
		case "A${1}" in
			A-ne) shift; local check="none";;
			A-warn) shift; local check="warn";;
			A-ns) shift; local save=0;;
			*) break;;
		esac
	done

	test "${FIREHOL_MODE}" = "DEBUG"   && local check="none"
	test "${FIREHOL_MODE}" = "EXPLAIN" && local check="none"
	
	if [ ! ${check} = "none" ]
	then
		printf "runcmd '${check}' '${FIREHOL_LINEID}' " >>${FIREHOL_OUTPUT}
	fi
	
	printf "%q " "$@" >>${FIREHOL_OUTPUT}
	if [ ${check} = "none" ]
	then
		printf " >/dev/null 2>&1 || echo >/dev/null\n" >>${FIREHOL_OUTPUT}
	else
		printf "\n" >>${FIREHOL_OUTPUT}
	fi

	if [ "${FIREHOL_MODE}" = "EXPLAIN" ]
	then
		${CAT_CMD} ${FIREHOL_OUTPUT}
		${RM_CMD} -f ${FIREHOL_OUTPUT}
	fi
	
	test $save -eq 1 && save_for_restore ${check} "${@}"

	return 0
}

runcmd() {
	local check="${1}"; shift
	local line="${1}"; shift
	local cmd="${1}"; shift

	"${cmd}" "$@" >${FIREHOL_OUTPUT}.log 2>&1
	local r=$?
	if [ "$FIREHOL_DEBUGGING" ]
	then
		"${CAT_CMD}" ${FIREHOL_OUTPUT}.log 1>&2
	fi
	test ${r} -gt 0 && runtime_error ${check} ${r} ${line} "${cmd}" "$@"
	
	return 0
}

# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# fast activation
# in fast activation mode we catch all /sbin/iptables commands and instead of
# executing them, we generate an iptables-restore compatible file.

run_fast() {
	local t=filter
	local cmd="$1"
	shift

	if [ "${cmd}" = "ip6tables" ]
	then
		n=table6
	else
		n=table
	fi
	
	if [ "z$1" = "z-t" ]
	then
		local t="$2"
		shift 2
	fi
	
	case "$1" in
		-P)	echo ":$2 $3 [0:0]" >>$FIREHOL_DIR/fast/${n}.${t}.policy
			;;
		
		-N)	echo ":$2 - [0:0]" >>$FIREHOL_DIR/fast/${n}.${t}.chains
			;;
		
		-A)	${CAT_CMD} <<EOFA >>$FIREHOL_DIR/fast/${n}.${t}.rules
${@}
EOFA
			;;
			
		-I)	${CAT_CMD} <<EOFI >>$FIREHOL_DIR/fast/${n}.${t}.rules
${@}
EOFI
			;;
		
		# if it is none of the above, we execute it normally.
		*)	echo "Ignoring command '${cmd} -t ${t} ${@}'"
			;;
	esac
	
	test ! -f $FIREHOL_DIR/fast/${n}s/${t} && ${TOUCH_CMD} $FIREHOL_DIR/fast/${n}s/${t}
	return 0
}

FIREHOL_COMMAND_COUNTER=0
iptables() {
	[ $firewall_policy_applied -eq 0 ] && firewall_policy
	
	if [ $FIREHOL_FAST_ACTIVATION -eq 1 ]
	then
		run_fast iptables "${@}"
	else
		postprocess -ns "${IPTABLES_CMD}" "$@"
		FIREHOL_COMMAND_COUNTER=$[FIREHOL_COMMAND_COUNTER + 1]
	fi
	
	return 0
}

FIREHOL_COMMAND6_COUNTER=0
ip6tables() {
	[ $firewall_policy6_applied -eq 0 ] && firewall_policy6
	
	if [ $FIREHOL_FAST_ACTIVATION -eq 1 ]
	then
		run_fast ip6tables "${@}"
	else
		postprocess -ns "${IP6TABLES_CMD}" "$@"
		FIREHOL_COMMAND6_COUNTER=$[FIREHOL_COMMAND6_COUNTER + 1]
	fi
	
	return 0
}

iptables_both() {
	if running_ipv4; then iptables "${@}" || return; fi
	if running_ipv6; then ip6tables "${@}" || return; fi
	return 0
}


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# INTERNAL FUNCTIONS BELLOW THIS POINT - Sub-commands
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------


# ------------------------------------------------------------------------------
# Change the policy of an interface
# WHY:
# Not all interfaces have the same policy. The admin must have control over it.
# Here we just set what the admin wants. At the interface finalization we
# produce the iptables rules.

policy() {
        work_realcmd_secondary ${FUNCNAME} "$@"
	
	require_work set any || return 1
	
	set_work_function "Setting policy of ${work_name} to ${1}"
	work_policy="$*"
	
	return 0
}

server() {
	work_realcmd_secondary ${FUNCNAME} "$@"
	
	require_work set any || return 1
	smart_function server "$@"
	return $?
}

server4() {
	ipv4 server "$@"
}

server6() {
	ipv6 server "$@"
}

server46() {
	both server "$@"
}

client() {
        work_realcmd_secondary ${FUNCNAME} "$@"
	
	require_work set any || return 1
	smart_function client "$@"
	return $?
}

client4() {
	ipv4 client "$@"
}

client6() {
	ipv6 client "$@"
}

client46() {
	both client "$@"
}

route() {
        work_realcmd_secondary ${FUNCNAME} "$@"
	
	require_work set router || return 1
	smart_function server "$@"
	return $?
}

route4() {
	ipv4 route "$@"
}

route6() {
	ipv6 route "$@"
}

route46() {
	both route "$@"
}


# --- protection ---------------------------------------------------------------

protection() {
        work_realcmd_secondary ${FUNCNAME} "$@"
	
	require_work set any || return 1
	
	local in="in"
	local prface="${work_inface}"
	
	local pre="pr"
	local reverse=
	if [ "${1}" = "reverse" ]
	then
		local reverse="reverse"	# needed to recursion
		local pre="prr"		# in case a router has protections
					# both ways, the second needs to
					# have different chain names
					
		local in="out"		# reverse the interface
		
		prface="${work_outface}"
		shift
	fi
	
	local type="${1}"
	local rate="${2}"
	local burst="${3}"
	
	test -z "${rate}"  && rate="100/s"
	test -z "${burst}" && burst="50"
	
	set_work_function -ne "Generating protections on '${prface}' for ${work_cmd} '${work_name}'"
	
	local x=
	for x in ${type}
	do
		case "${x}" in
			none|NONE)
				return 0
				;;
			
			bad-packets|BAD-PACKETS)
				protection ${reverse} "fragments new-tcp-w/o-syn malformed-xmas malformed-null malformed-bad invalid" "${rate}" "${burst}"
				return $?
				;;
			
			strong|STRONG|full|FULL|all|ALL)
				protection ${reverse} "fragments new-tcp-w/o-syn icmp-floods syn-floods malformed-xmas malformed-null malformed-bad invalid" "${rate}" "${burst}"
				return $?
				;;
				
			invalid|INVALID)
				iptables_both -A "${in}_${work_name}" -m conntrack --ctstate INVALID -j DROP				|| return 1
				;;
				
			fragments|FRAGMENTS)
				if running_ipv4; then
					push_namespace ipv4
					local frag_status=0
					local mychain="${pre}_${work_name}_fragments"
					create_chain filter "${mychain}" "${in}_${work_name}" in custom "-f" || frag_status=$[frag_status+1]

					set_work_function "Generating rules to be protected from packet fragments on '${prface}' for ${work_cmd} '${work_name}'"

					rule in chain "${mychain}" loglimit "PACKET FRAGMENTS" action drop || frag_status=$[frag_status+1]
					pop_namespace
					if [ $frag_status -gt 0 ]
					then
						return 1
					fi
				fi
				# IPv6 packet fragments can be used to
				# evade stateless firewalls. FireHOL
				# creates a stateful firewall with connection
				# tracking, so fragments will be reassembled
				# before checking.
				;;
				
			new-tcp-w/o-syn|NEW-TCP-W/O-SYN)
				local mychain="${pre}_${work_name}_nosyn"
				create_chain filter "${mychain}" "${in}_${work_name}" in proto tcp state NEW custom "! --syn"	|| return 1
				
				set_work_function "Generating rules to be protected from new TCP connections without the SYN flag set on '${prface}' for ${work_cmd} '${work_name}'"
				
				rule in chain "${mychain}" loglimit "NEW TCP w/o SYN" action drop				|| return 1
				;;
				
			icmp-floods|ICMP-FLOODS)
				local mychain="${pre}_${work_name}_icmpflood"

				if running_ipv4; then
					ipv4 create_chain filter "${mychain}" "${in}_${work_name}" in proto icmp custom "--icmp-type echo-request"	|| return 1
				fi
				if running_ipv6; then
					ipv6 create_chain filter "${mychain}" "${in}_${work_name}" in proto icmpv6 custom "--icmpv6-type echo-request"	|| return 1
				fi
				
				set_work_function "Generating rules to be protected from ICMP floods on '${prface}' for ${work_cmd} '${work_name}'"
				
				rule in chain "${mychain}" limit "${rate}" "${burst}" action return				|| return 1
				rule in chain "${mychain}" loglimit "ICMP FLOOD" action drop					|| return 1
				;;
				
			syn-floods|SYN-FLOODS)
				local mychain="${pre}_${work_name}_synflood"
				create_chain filter "${mychain}" "${in}_${work_name}" in proto tcp custom "--syn"		|| return 1
				
				set_work_function "Generating rules to be protected from TCP SYN floods on '${prface}' for ${work_cmd} '${work_name}'"
				
				rule in chain "${mychain}" limit "${rate}" "${burst}" action return				|| return 1
				rule in chain "${mychain}" loglimit "SYN FLOOD" action drop					|| return 1
				;;
				
			all-floods|ALL-FLOODS)
				local mychain="${pre}_${work_name}_allflood"
				create_chain filter "${mychain}" "${in}_${work_name}" in state NEW		|| return 1
				
				set_work_function "Generating rules to be protected from ALL floods on '${prface}' for ${work_cmd} '${work_name}'"
				
				rule in chain "${mychain}" limit "${rate}" "${burst}" action return				|| return 1
				rule in chain "${mychain}" loglimit "ALL FLOOD" action drop					|| return 1
				;;
				
			malformed-xmas|MALFORMED-XMAS)
				local mychain="${pre}_${work_name}_malxmas"
				create_chain filter "${mychain}" "${in}_${work_name}" in proto tcp custom "--tcp-flags ALL ALL"	|| return 1
				
				set_work_function "Generating rules to be protected from packets with all TCP flags set on '${prface}' for ${work_cmd} '${work_name}'"
				
				rule in chain "${mychain}" loglimit "MALFORMED XMAS" action drop				|| return 1
				;;
				
			malformed-null|MALFORMED-NULL)
				local mychain="${pre}_${work_name}_malnull"
				create_chain filter "${mychain}" "${in}_${work_name}" in proto tcp custom "--tcp-flags ALL NONE" || return 1
				
				set_work_function "Generating rules to be protected from packets with all TCP flags unset on '${prface}' for ${work_cmd} '${work_name}'"
				
				rule in chain "${mychain}" loglimit "MALFORMED NULL" action drop				|| return 1
				;;
				
			malformed-bad|MALFORMED-BAD)
				local mychain="${pre}_${work_name}_malbad"
				create_chain filter "${mychain}" "${in}_${work_name}" in proto tcp custom "--tcp-flags SYN,FIN SYN,FIN"			|| return 1
				
				set_work_function "Generating rules to be protected from packets with illegal TCP flags on '${prface}' for ${work_cmd} '${work_name}'"
				
				rule in chain "${in}_${work_name}" action "${mychain}"   proto tcp custom "--tcp-flags SYN,RST SYN,RST"			|| return 1
				rule in chain "${in}_${work_name}" action "${mychain}"   proto tcp custom "--tcp-flags ALL     SYN,RST,ACK,FIN,URG"	|| return 1
				rule in chain "${in}_${work_name}" action "${mychain}"   proto tcp custom "--tcp-flags ALL     FIN,URG,PSH"		|| return 1
				
				rule in chain "${mychain}" loglimit "MALFORMED BAD" action drop								|| return 1
				;;
				
			*)
				error "Protection '${x}' does not exists."
				return 1
				;;
		esac
	done
	
	return 0
}


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# KERNEL MODULE MANAGEMENT
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

# ------------------------------------------------------------------------------
# Manage kernel modules
# WHY:
# We need to load a set of kernel modules during postprocessing, and after the
# new firewall has been activated.
# The whole point of the following code, is not to attempt loading modules when
# they are compiled into the kernel.

# Try to find the current kernel configuration
KERNEL_CONFIG=
if [ -f "/proc/config" ]
then
	KERNEL_CONFIG="/proc/config"
	${CAT_CMD} /proc/config >"${FIREHOL_DIR}/kcfg" || KERNEL_CONFIG=
fi

if [ -z "${KERNEL_CONFIG}" -a -f "/proc/config.gz" ]
then
	KERNEL_CONFIG="/proc/config.gz"
	zcat_cmd /proc/config.gz >"${FIREHOL_DIR}/kcfg" || KERNEL_CONFIG=
fi

if [ -z "${KERNEL_CONFIG}" -a -f "/lib/modules/`${UNAME_CMD} -r`/build/.config" ]
then
	KERNEL_CONFIG="/lib/modules/`${UNAME_CMD} -r`/build/.config"
	"${CAT_CMD}" "${KERNEL_CONFIG}" >"${FIREHOL_DIR}/kcfg" || KERNEL_CONFIG=
fi

if [ -z "${KERNEL_CONFIG}" -a -f "/boot/config-`${UNAME_CMD} -r`" ]
then
	KERNEL_CONFIG="/boot/config-`${UNAME_CMD} -r`"
	"${CAT_CMD}" "${KERNEL_CONFIG}" >"${FIREHOL_DIR}/kcfg" || KERNEL_CONFIG=
fi

if [ -z "${KERNEL_CONFIG}" -a -f "/usr/src/linux/.config" ]
then
	KERNEL_CONFIG="/usr/src/linux/.config"
	"${CAT_CMD}" "${KERNEL_CONFIG}" >"${FIREHOL_DIR}/kcfg" || KERNEL_CONFIG=
fi

# Did we managed to find the kernel configuration?
if [ ! -z "{$KERNEL_CONFIG}" -a -s "${FIREHOL_DIR}/kcfg" ]
then
	# We found a kernel configuration
	
	# Load all the definitions for CONFIG_*_NF_* variables
	# We grep what we care for, to make sure there is no garbage or malicious code
	# in the file we will run.
	"${CAT_CMD}" "${FIREHOL_DIR}/kcfg" | ${GREP_CMD} -e "^CONFIG_[A-Z0-9_]\+_NF_[A-Z0-9_]\+=[ynm]$" >"${FIREHOL_DIR}/kcfg.nf"
	
	# run it to get the variables
	source "${FIREHOL_DIR}/kcfg.nf"
else
	# We could not find a kernel configuration
	
	KERNEL_CONFIG=

	if [ ! ${FIREHOL_LOAD_KERNEL_MODULES} -eq 0 ]
	then
		echo >&2 " "
		echo >&2 " IMPORTANT WARNING:"
		echo >&2 " ------------------"
		echo >&2 " FireHOL cannot find your current kernel configuration."
		echo >&2 " Please, either compile your kernel with /proc/config,"
		echo >&2 " or make sure there is a valid kernel config in:"
		echo >&2 " /usr/src/linux/.config"
		echo >&2 " "
		echo >&2 " Because of this, FireHOL will simply attempt to load"
		echo >&2 " all kernel modules for the services used, without"
		echo >&2 " being able to detect failures."
		echo >&2 " "
		sleep 2
	fi

fi

# activation-phase command to check for the existance of
# a kernel configuration directive. It returns:
# 0 = module is already in the kernel
# 1 = module can be loaded with modprobe
# 2 = no info about this module in the kernel
check_kernel_config() {
	# In kernels 2.6.20+ _IP_ was removed from kernel iptables config names.
	# A few kernels have _CONNTRACT_ replaced with _CT_ for certain modules.
	# Try all versions.
	
	# the original way
	eval local kcfg1="\$${1}"
	
	# without _IP_
	local t=`echo ${1} | ${SED_CMD} "s/_IP_//g"`
	eval local kcfg2="\$${t}"
	
	# _CONNTRACK_ as _CT_
	local t=`echo ${1} | ${SED_CMD} "s/_CONNTRACK_/_CT_/g"`
	eval local kcfg3="\$${t}"
	
	# prefer the kernel 2.6.20+ way
	if [ ! -z "${kcfg2}" ]
	then
		kcfg="${kcfg2}"
	
	elif [ ! -z "${kcfg3}" ]
	then
		kcfg="${kcfg3}"
	else
		kcfg="${kcfg1}"
	fi
	
	case ${kcfg} in
		y)	return 0
			;;
		
		m)	return 1
			;;
		
		*)	return 2
			;;
	esac
	
	return 2
}

# activation-phase command to check for the existance of
# a kernel module. It returns:
# 0 = module is already in the kernel
# 1 = module can be loaded with modprobe
# 2 = no info about this module in the kernel
check_kernel_module() {
	local mod="${1}"
	
	case ${mod} in
		ip_tables)
			test -f /proc/net/ip_tables_names && return 0
			check_kernel_config CONFIG_IP_NF_IPTABLES
			test $? -ne 0 && check_kernel_config CONFIG_NF_TABLES_IPV4
			return $?
			;;

		ip6_tables)
			test -f /proc/net/ip6_tables_names && return 0
			check_kernel_config CONFIG_NF_TABLES_IPV6
			return $?
			;;
		
		ip_conntrack|nf_conntrack)
			test -f /proc/net/ip_conntrack -o -f /proc/net/nf_conntrack && return 0
			check_kernel_config CONFIG_IP_NF_CONNTRACK
			test $? -ne 0 && check_kernel_config CONFIG_NF_CONNTRACK_IPV4
			return $?
			;;
			
		ip_conntrack_*|nf_conntrack_*)
			local mnam="CONFIG_IP_NF_`echo ${mod} | ${CUT_CMD} -d '_' -f 3- | ${TR_CMD} a-z A-Z`"
			check_kernel_config ${mnam}
			return $?
			;;
			
		ip_nat_*|nf_nat_*)
			local mnam="CONFIG_IP_NF_NAT_`echo ${mod} | ${CUT_CMD} -d '_' -f 3- | ${TR_CMD} a-z A-Z`"
			check_kernel_config ${mnam}
			return $?
			;;
			
		*)
			return 2
			;;
	esac
	
	return 2
}

# activation-phase command to load a kernel module.
LOADED_KERNEL_MODULES=
load_kernel_module() {
	local mod="${1}"
	
	if [ ! ${FIREHOL_LOAD_KERNEL_MODULES} -eq 0 ]
	then
		local m=
		for m in ${LOADED_KERNEL_MODULES}
		do
			test "${m}" = "${mod}" && return 0
		done
		LOADED_KERNEL_MODULES="${LOADED_KERNEL_MODULES} ${mod}"

		modprobe_cmd ${mod} -q
		if [ $? -gt 0 ]
		then
			check_kernel_module ${mod} || runtime_error warn 1 ${FIREHOL_LINEID} "${MODPROBE_CMD}" ${mod} -q
		fi
	fi
	return 0
}

# Processing-phase command to tell FireHOL to find one or more
# kernel modules to load, during activation-phase.
require_kernel_module() {
	local new="${1}"
	
	local m=
	for m in ${FIREHOL_KERNEL_MODULES}
	do
		test "${m}" = "${new}" && return 0
	done
	
	set_work_function "Adding kernel module '${new}' in the list of kernel modules to load"
	FIREHOL_KERNEL_MODULES="${FIREHOL_KERNEL_MODULES} ${new}"
	
	return 0
}


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# INTERNAL FUNCTIONS BELLOW THIS POINT - FireHOL internals
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------


set_work_function() {
	local show_explain=1
	test "$1" = "-ne" && shift && local show_explain=0
	
	work_function="$*"
	
	if [ "${FIREHOL_MODE}" = "EXPLAIN" ]
	then
		test ${show_explain} -eq 1 && printf "\n# %s\n" "$*"
	elif [ ${FIREHOL_CONF_SHOW} -eq 1 ]
	then
		test ${show_explain} -eq 1 && printf "\n# INFO>>> %s\n" "$*" >>${FIREHOL_OUTPUT}
	fi
}


# ------------------------------------------------------------------------------
# Check the status of the current primary command.
# WHY:
# Some sanity check for the order of commands in the configuration file.
# Each function has a "require_work type command" in order to check that it is
# placed in a valid point. This means that if you place a "route" command in an
# interface section (and many other combinations) it will fail.

require_work() {
	local type="${1}"
	local cmd="${2}"
	
	case "${type}" in
		clear)
			test ! -z "${work_cmd}" && error "Previous work was not applied." && return 1
			;;
		
		set)
			test -z "${work_cmd}" && error "The command used requires that a primary command is set." && return 1
			test ! "${work_cmd}" = "${cmd}" -a ! "${cmd}" = "any"  && error "Primary command is '${work_cmd}' but '${cmd}' is required." && return 1
			;;
			
		*)
			error "Unknown work status '${type}'."
			return 1
			;;
	esac
	
	return 0
}


# ------------------------------------------------------------------------------
# Finalizes the rules of the last primary command.
# WHY:
# At the end of an interface or router we need to add some code to apply its
# policy, accept all related packets, etc.
# Finalization occures automatically when a new primary command is executed and
# when the configuration file finishes.

close_cmd() {
	set_work_function -ne "Closing last open primary command (${work_cmd}/${work_name})"
	
	case "${work_cmd}" in
		interface)
			close_interface || return 1
			;;
		
		router)
			close_router || return 1
			;;
		
		'')
			;;
		
		*)
			error "Unknown work '${work_cmd}'."
			return 1
			;;
	esac
	
	# Reset the current status variables to empty/default
	work_counter4=0
	work_counter6=0
	work_cmd=
	work_realcmd=("(unset)")
	work_name=
	work_inface=
	work_outface=
	work_policy=
	
	return 0
}


# ------------------------------------------------------------------------------
# close_interface
# WHY:
# Finalizes the rules for the last interface().

close_interface() {
	require_work set interface || return 1
	
	close_all_groups
	
	set_work_function "Finilizing interface '${work_name}'"
	
	# Accept all related traffic to the established connections
	rule chain "in_${work_name}" state RELATED action ACCEPT || return 1
	rule chain "out_${work_name}" state RELATED action ACCEPT || return 1
	
	# make sure we have a policy
	test -z "${work_policy}" && work_policy="${DEFAULT_INTERFACE_POLICY}"
	case "${work_policy}" in
		return|RETURN)
			return 0
			;;
			
		accept|ACCEPT)
			;;
		
		*)	
			if [ "${FIREHOL_DROP_ORPHAN_TCP_ACK_FIN}" = "1" ]
			then
				# Silently drop orphan TCP/ACK FIN packets
				rule chain "in_${work_name}" proto tcp custom "--tcp-flags ALL ACK,FIN" action DROP || return 1
				rule reverse chain "out_${work_name}" proto tcp custom "--tcp-flags ALL ACK,FIN" action DROP || return 1
			fi
			
			local -a inlog=(loglimit "IN-${work_name}")
			local -a outlog=(loglimit "OUT-${work_name}")
			;;
	esac
	
	rule chain "in_${work_name}" "${inlog[@]}" action ${work_policy} || return 1
	rule reverse chain "out_${work_name}" "${outlog[@]}" action ${work_policy} || return 1
	
	return 0
}


# ------------------------------------------------------------------------------
# close_router
# WHY:
# Finalizes the rules for the last router().

close_router() {	
	require_work set router || return 1
	
	close_all_groups
	
	set_work_function "Finilizing router '${work_name}'"
	
	# Accept all related traffic to the established connections
	rule chain "in_${work_name}" state RELATED action ACCEPT || return 1
	rule chain "out_${work_name}" state RELATED action ACCEPT || return 1
	
	# make sure we have a policy
	test -z "${work_policy}" && work_policy="${DEFAULT_ROUTER_POLICY}"
	case "${work_policy}" in
		return|RETURN)
			return 0
			;;
			
		accept|ACCEPT)
			;;
		
		*)	
			if [ "${FIREHOL_DROP_ORPHAN_TCP_ACK_FIN}" = "1" ]
			then
				# Silently drop orphan TCP/ACK FIN packets
				rule chain "in_${work_name}" proto tcp custom "--tcp-flags ALL ACK,FIN" action DROP || return 1
				rule reverse chain "out_${work_name}" proto tcp custom "--tcp-flags ALL ACK,FIN" action DROP || return 1
			fi
			
			local -a inlog=(loglimit "PASS-${work_name}")
			local -a outlog=(loglimit "PASS-${work_name}")
			;;
	esac
	
	rule chain "in_${work_name}" "${inlog[@]}" action ${work_policy} || return 1
	rule reverse chain "out_${work_name}" "${outlog[@]}" action ${work_policy} || return 1
	
	return 0
}


# ------------------------------------------------------------------------------
# close_master
# WHY:
# Finalizes the rules for the whole firewall.
# It assummes there is not primary command open.

close_master() {
	set_work_function "Finilizing firewall policies"
	
	if [ $connmark_count -gt 0 ]
	then
		# if connmark has been used, add MARK restoration from CONNMARK, at the top of mangle
		# copy CONNMARK to MARK
		iptables_both -t mangle -I OUTPUT     1 -m conntrack --ctstate ESTABLISHED,RELATED -j CONNMARK --restore-mark
		iptables_both -t mangle -I PREROUTING 1 -m conntrack --ctstate ESTABLISHED,RELATED -j CONNMARK --restore-mark
	fi

	# Accept all related traffic to the established connections
	rule chain INPUT state RELATED action ACCEPT || return 1
	rule chain OUTPUT state RELATED action ACCEPT || return 1
	rule chain FORWARD state RELATED action ACCEPT || return 1
	
	if [ "${FIREHOL_DROP_ORPHAN_TCP_ACK_FIN}" = "1" ]
	then
		# Silently drop orphan TCP/ACK FIN packets
		rule chain INPUT proto tcp custom "--tcp-flags ALL ACK,FIN" action DROP || return 1
		rule chain OUTPUT proto tcp custom "--tcp-flags ALL ACK,FIN" action DROP || return 1
		rule chain FORWARD proto tcp custom "--tcp-flags ALL ACK,FIN" action DROP || return 1
	fi
	
	rule chain INPUT loglimit "IN-unknown" action ${UNMATCHED_INPUT_POLICY} || return 1
	rule chain OUTPUT loglimit "OUT-unknown" action ${UNMATCHED_OUTPUT_POLICY} || return 1
	rule chain FORWARD loglimit "PASS-unknown" action ${UNMATCHED_ROUTER_POLICY} || return 1
	return 0
}


FIREHOL_GROUP_COUNTER=0
FIREHOL_GROUP_DEPTH=0
FIREHOL_GROUP_STACK=()
group() {
        work_realcmd_primary ${FUNCNAME} "$@"
	
	require_work set any || return 1
	
	local type="${1}"; shift
	
	case $type in
		with|start|begin)
			push_namespace "${FIREHOL_NS_CURR}"
			# increase the counter
			FIREHOL_GROUP_COUNTER=$[FIREHOL_GROUP_COUNTER + 1]
			
			set_work_function "Starting new group No ${FIREHOL_GROUP_COUNTER}, under '${work_name}'"
			
			# put the current name in the stack
			FIREHOL_GROUP_STACK[$FIREHOL_GROUP_DEPTH]=${work_name}
			FIREHOL_GROUP_DEPTH=$[FIREHOL_GROUP_DEPTH + 1]
			
			# name for the new chain
			mychain="group${FIREHOL_GROUP_COUNTER}"
			
			# create the new chain
			create_chain filter "in_${mychain}" "in_${work_name}" in "$@" || return 1
			create_chain filter "out_${mychain}" "out_${work_name}" out reverse "$@" || return 1
			
			# set a new name for new rules
			work_name=${mychain}
			;;
		
		end|stop|close)
			if [ ${FIREHOL_GROUP_DEPTH} -eq 0 ]
			then
				error "There is no group open to close."
				return 1
			fi
			
			# pop one name from the stack
			FIREHOL_GROUP_DEPTH=$[FIREHOL_GROUP_DEPTH - 1]
			
			set_work_function "Closing group '${work_name}'. Now working under '${FIREHOL_GROUP_STACK[$FIREHOL_GROUP_DEPTH]}'"
			
			work_name=${FIREHOL_GROUP_STACK[$FIREHOL_GROUP_DEPTH]}
			pop_namespace
			;;
		
		*)
			error "Statement 'group' requires the first argument to be one of with, start, begin, end, stop, close."
			return 1
			;;
	esac
	
	return 0
}

group4() {
	ipv4 group "$@"
}

group6() {
	ipv6 group "$@"
}

group46() {
	both group "$@"
}

close_all_groups() {
	while [ ${FIREHOL_GROUP_DEPTH} -gt 0 ]
	do
		group close || return 1
	done
	
	return 0
}



# ------------------------------------------------------------------------------
# rule - the heart of FireHOL - iptables commands generation
# WHY:
# This is the function that gives all the magic to FireHOL. Actually it is a
# wrapper for iptables, producing multiple iptables commands based on its
# arguments. The rest of FireHOL is simply a "driver" for this function.


# rule_action_param() is a function - part of rule() - to create the final iptables cmd
# taking into account the "action_param" parameter of the action.

# rule_action_param() should only be used within rule() - no other place

FIREHOL_ACCEPT_CHAIN_COUNT=0
rule_action_param() {
	local iptables_cmd="${1}"; shift
	local action="${1}"; shift
	local protocol="${1}"; shift
	local statenot="${1}"; shift
	local state="${1}"; shift
	local table="${1}"; shift
	local -a action_param=()
	
	# All arguments until the separator are the parameters of the action
	local count=0
	while [ ! -z "${1}" -a ! "A${1}" = "A--" ]
	do
		local -a action_param[$count]="${1}"
		shift
		
		local count=$[count + 1]
	done
	
	# If we don't have a seperator, generate an error
	local sep="${1}"; shift
	if [ ! "A${sep}" = "A--" ]
	then
		error "Internal Error, in parsing action_param parameters ($FUNCNAME '${action}' '${protocol}' '${statenot}' '${state}' '${table}' '${action_param[@]}' ${sep} '$@')."
		return 1
	fi
	
	# Do the rule
	case "${action}" in
		NONE)
			return 0
			;;
			
		ACCEPT)
			# do we have any options for this accept?
			if [ ! -z "${action_param[0]}" ]
			then
				# find the options we have
				case "${action_param[0]}" in
					"limit")
						# limit NEW connections to the specified rate
						local freq="${action_param[1]}"
						local burst="${action_param[2]}"
						local overflow="REJECT"
						
						# if we have a custom overflow action, parse it.
						test "${action_param[3]}" = "overflow" && local overflow="`echo "${action_param[4]}" | tr "a-z" "A-Z"`"
						
						# unset the action_param, so that if this rule does not include NEW connections,
						# we will not append anything to the generated iptables statements.
						local -a action_param=()
						
						# find is this rule matches NEW connections
						local has_new=`echo "${state}" | grep -i NEW`
						local do_accept_limit=0
						if [ -z "${statenot}" ]
						then
							test ! -z "${has_new}" && local do_accept_limit=1
						else
							test -z "${has_new}" && local do_accept_limit=1
						fi
						
						# we have a match for NEW connections.
						# redirect the traffic to a new chain, which will control
						# the NEW connections while allowing all the other traffic
						# to pass.
						if [ "${do_accept_limit}" = "1" ]
						then
							local accept_limit_chain="`echo "ACC LIM ${freq} ${burst} ${overflow}" | tr " /." "___"`"
							
							# does the chain we need already exist?
							#if [ ! -f "${FIREHOL_CHAINS_DIR}/${accept_limit_chain}.${iptables_cmd}" ]
							if [ -z "${FIREHOL_CHAINS[${accept_limit_chain}.${iptables_cmd}]}" ]
							then
								# the chain does not exist. create it.
								$iptables_cmd ${table} -N "${accept_limit_chain}"
								FIREHOL_CHAINS[${accept_limit_chain}.${iptables_cmd}]="1"
								#touch "${FIREHOL_CHAINS_DIR}/${accept_limit_chain}.${iptables_cmd}"
								
								# first, if the traffic is not a NEW connection, allow it.
								# doing this first will speed up normal traffic.
								$iptables_cmd ${table} -A "${accept_limit_chain}" -m conntrack ! --ctstate NEW -j ACCEPT
								
								# accept NEW connections within the given limits.
								$iptables_cmd ${table} -A "${accept_limit_chain}" -m limit --limit "${freq}" --limit-burst "${burst}" -j ACCEPT
								
								# log the overflow NEW connections reaching this step within the new chain
								local -a logopts_arg=()
								if [ "${FIREHOL_LOG_MODE}" = "ULOG" ]
								then
									local -a logopts_arg=("--ulog-prefix=${FIREHOL_LOG_PREFIX}LIMIT_OVERFLOW:")
								elif [ "${FIREHOL_LOG_MODE}" = "NFLOG" ]
								then
									local -a logopts_arg=("--nflog-prefix=${FIREHOL_LOG_PREFIX}LIMIT_OVERFLOW:")
								else
									local -a logopts_arg=("--log-level" "${FIREHOL_LOG_LEVEL}" "--log-prefix=${FIREHOL_LOG_PREFIX}LIMIT_OVERFLOW:")
								fi
								$iptables_cmd ${table} -A "${accept_limit_chain}" -m limit --limit "${FIREHOL_LOG_FREQUENCY}" --limit-burst "${FIREHOL_LOG_BURST}" -j ${FIREHOL_LOG_MODE} ${FIREHOL_LOG_OPTIONS} "${logopts_arg[@]}"
								
								# if the overflow is to be rejected is tcp, reject it with TCP-RESET
								if [ "${overflow}" = "REJECT" ]
								then
									$iptables_cmd ${table} -A "${accept_limit_chain}" -p tcp -j REJECT --reject-with tcp-reset
								fi
								
								# do the specified action on the overflow
								$iptables_cmd ${table} -A "${accept_limit_chain}" -j ${overflow}
							fi
							
							# send the rule to be generated to this chain
							local action=${accept_limit_chain}
						fi
						;;
						
					"recent")
						# limit NEW connections to the specified rate
						local name="${action_param[1]}"
						local seconds="${action_param[2]}"
						local hits="${action_param[3]}"
						
						# unset the action_param, so that if this rule does not include NEW connections,
						# we will not append anything to the generated iptables statements.
						local -a action_param=()
						
						# find is this rule matches NEW connections
						local has_new=`echo "${state}" | grep -i NEW`
						local do_accept_recent=0
						if [ -z "${statenot}" ]
						then
							test ! -z "${has_new}" && local do_accept_recent=1
						else
							test -z "${has_new}" && local do_accept_recent=1
						fi
						
						# we have a match for NEW connections.
						# redirect the traffic to a new chain, which will control
						# the NEW connections while allowing all the other traffic
						# to pass.
						if [ "${do_accept_recent}" = "1" ]
						then
							local accept_recent_chain="`echo "ACC REC $name $seconds $hits" | tr " /." "___"`"
							
							# does the chain we need already exist?
							#if [ ! -f "${FIREHOL_CHAINS_DIR}/${accept_recent_chain}.${iptables_cmd}" ]
							if [ -z "${FIREHOL_CHAINS[${accept_recent_chain}.${iptables_cmd}]}" ]
							then
								# the chain does not exist. create it.
								$iptables_cmd ${table} -N "${accept_recent_chain}"
								FIREHOL_CHAINS[${accept_recent_chain}.${iptables_cmd}]="1"
								#touch "${FIREHOL_CHAINS_DIR}/${accept_recent_chain}.${iptables_cmd}"
								
								# first, if the traffic is not a NEW connection, allow it.
								# doing this first will speed up normal traffic.
								$iptables_cmd ${table} -A "${accept_recent_chain}" -m conntrack ! --ctstate NEW -j ACCEPT
								
								# accept NEW connections within the given limits.
								$iptables_cmd ${table} -A "${accept_recent_chain}" -m recent --set --name "${name}"
								
								local t1=
								test ! -z $seconds && local t1="--seconds ${seconds}"
								local t2=
								test ! -z $hits && local t2="--hitcount ${hits}"
								
								$iptables_cmd ${table} -A "${accept_recent_chain}" -m recent --update ${t1} ${t2} --name "${name}" -j RETURN
								$iptables_cmd ${table} -A "${accept_recent_chain}" -j ACCEPT
							fi
							
							# send the rule to be generated to this chain
							local action=${accept_recent_chain}
						fi
						;;
						
					'knock')
						# the name of the knock
						local name="knock_${action_param[1]}"
						
						# unset the action_param, so that if this rule does not include NEW connections,
						# we will not append anything to the generated iptables statements.
						local -a action_param=()
						
						# does the knock chain exists?
						#if [ ! -f "${FIREHOL_CHAINS_DIR}/${name}.${iptables_cmd}" ]
						if [ -z "${FIREHOL_CHAINS[${name}.${iptables_cmd}]}" ]
						then
							# the chain does not exist. create it.
							$iptables_cmd ${table} -N "${name}"
							FIREHOL_CHAINS[${name}.${iptables_cmd}]="1"
							#touch "${FIREHOL_CHAINS_DIR}/${name}.${iptables_cmd}"
							
							$iptables_cmd -A "${name}" -m conntrack --ctstate ESTABLISHED -j ACCEPT
							
							# knockd (http://www.zeroflux.org/knock/)
							# will create more rules inside this chain to match NEW packets.
						fi
						
						# send the rule to be generated to this knock chain
						local action=${name}
						;;
						
					*)
						error "Internal error. Cannot understand action ${action} with parameter '${action_param[0]}'."
						return 1
						;;
				esac
			fi
			;;
			
		REJECT)
			if [ "${action_param[1]}" = "auto" ]
			then
				if [ "${protocol}" = "tcp" -o "${protocol}" = "TCP" ]
				then
					local -a action_param=("--reject-with" "tcp-reset")
				else
					local -a action_param=()
				fi
			fi
			;;
	esac
	
	$iptables_cmd "$@" -j "${action}" "${action_param[@]}"
}

rule() {
	local table=
	local chain=
	
	local inface=any
	local infacenot=
	
	local outface=any
	local outfacenot=
	
	local physin=any
	local physinnot=
	
	local physout=any
	local physoutnot=
	
	local mac=any
	local macnot=
	
	local src4=default
	local src4not=

	local dst4=default
	local dst4not=

	local src6=default
	local src6not=

	local dst6=default
	local dst6not=
	
	local srctype=
	local srctypenot=
	
	local dsttype=
	local dsttypenot=
	
	local sport=any
	local sportnot=
	
	local dport=any
	local dportnot=
	
	local proto=any
	local protonot=
	
	local uid=any
	local uidnot=
	
	local gid=any
	local gidnot=
	
	local pid=any
	local pidnot=
	
	local sid=any
	local sidnot=
	
	local cmd=any
	local cmdnot=
	
	local mark=any
	local marknot=
	
	local dscp=any
	local dscptype=
	local despnot=
	
	local tos=any
	local tosnot=
	
	local log=
	local logtxt=
	local loglevel=
	
	local limit=
	local burst=
	
	local iplimit=
	local iplimit_mask=
	
	local action=
	
	local state=
	local statenot=
	
	local failed=0
	local reverse=0
	
	local swi=0
	local swo=0
	
	local custom=
	
	# if set to 1, all owner module options will be ignored
	local noowner=0
	
	# if set to 1, all mac options will be ignored
	local nomac=0
	
	# if set to 1, MIRROR will be converted to REJECT
	local nomirror=0
	
	# if set to 1, log and loglimit are ignored.
	local nolog=0
	
	# if set to 1, detection algorithm about overwritting optional rule
	# parameters will take place.
	local softwarnings=1
	
	# set it, in order to be local
	local -a action_param=()
	
	# accounting
	local accounting=

	while [ ! -z "${1}" ]
	do
		case "${1}" in
			reverse|REVERSE)
				local reverse=1
				shift
				;;
				
			table|TABLE)
				test ${softwarnings} -eq 1 -a ! -z "${table}" && softwarning "Overwritting param: ${1} '${chain}' becomes '${2}'"
				local table="-t ${2}"
				shift 2
				;;
				
			chain|CHAIN)
				test ${softwarnings} -eq 1 -a ! -z "${chain}" && softwarning "Overwritting param: ${1} '${chain}' becomes '${2}'"
				local chain="${2}"
				shift 2
				;;
				
			inface|INFACE)
				shift
				if [ ${reverse} -eq 0 ]
				then
					local infacenot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						local infacenot="!"
					else
						if [ ${swi} -eq 1 ]
						then
							work_inface="${1}"
						fi
					fi
					test ${softwarnings} -eq 1 -a ! "${inface}" = "any" && softwarning "Overwritting param: inface '${inface}' becomes '${1}'"
					local inface="${1}"
				else
					local outfacenot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						local outfacenot="!"
					else
						if [ ${swo} -eq 1 ]
						then
							work_outface="$1"
						fi
					fi
					test ${softwarnings} -eq 1 -a ! "${outface}" = "any" && softwarning "Overwritting param: outface '${outface}' becomes '${1}'"
					local outface="${1}"
				fi
				shift
				;;
				
			outface|OUTFACE)
				shift
				if [ ${reverse} -eq 0 ]
				then
					local outfacenot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						local outfacenot="!"
					else
						if [ ${swo} -eq 1 ]
						then
							work_outface="${1}"
						fi
					fi
					test ${softwarnings} -eq 1 -a ! "${outface}" = "any" && softwarning "Overwritting param: outface '${outface}' becomes '${1}'"
					local outface="${1}"
				else
					local infacenot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						local infacenot="!"
					else
						if [ ${swi} -eq 1 ]
						then
							work_inface="${1}"
						fi
					fi
					test ${softwarnings} -eq 1 -a ! "${inface}" = "any" && softwarning "Overwritting param: inface '${inface}' becomes '${1}'"
					local inface="${1}"
				fi
				shift
				;;
				
			physin|PHYSIN)
				shift
				if [ ${reverse} -eq 0 ]
				then
					local physinnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						local physinnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${physin}" = "any" && softwarning "Overwritting param: physin '${physin}' becomes '${1}'"
					local physin="${1}"
				else
					local physoutnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						local physoutnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${physout}" = "any" && softwarning "Overwritting param: physout '${physout}' becomes '${1}'"
					local physout="${1}"
				fi
				shift
				;;
				
			physout|PHYSOUT)
				shift
				if [ ${reverse} -eq 0 ]
				then
					local physoutnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						local physoutnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${physout}" = "any" && softwarning "Overwritting param: physout '${physout}' becomes '${1}'"
					local physout="${1}"
				else
					local physinnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						local physinnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${physin}" = "any" && softwarning "Overwritting param: physin '${physin}' becomes '${1}'"
					local physin="${1}"
				fi
				shift
				;;
				
			mac|MAC)
				shift
				local macnot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					test ${nomac} -eq 0 && local macnot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${mac}" = "any" && softwarning "Overwritting param: mac '${mac}' becomes '${1}'"
				test ${nomac} -eq 0 && local mac="${1}"
				shift
				;;
				
			src|SRC|source|SOURCE|src4|src6)
				if [ "${1}" = "src4" ]
				then
					if ! push_namespace ipv4; then return 1; fi
				elif [ "${1}" = "src6" ]
				then
					if ! push_namespace ipv6; then return 1; fi
				else
					push_namespace "${FIREHOL_NS_CURR}"
				fi
				shift
				if [ ${reverse} -eq 0 ]
				then
					if running_ipv4; then
						local src4not=
					fi
					if running_ipv6; then
						local src6not=
					fi
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						if running_ipv4; then
							local src4not="!"
						fi
						if running_ipv6; then
							local src6not="!"
						fi
					fi
					if running_ipv4; then
						test ${softwarnings} -eq 1 -a ! "${src4}" = "default" && softwarning "Overwritting param: src4 '${src4}' becomes '${1}'"
						local src4=$(ipv4 eval_param "${1}")
					fi
					if running_ipv6; then
						test ${softwarnings} -eq 1 -a ! "${src6}" = "default" && softwarning "Overwritting param: src6 '${src6}' becomes '${1}'"
						local src6=$(ipv6 eval_param "${1}")
					fi
				else
					if running_ipv4; then
						local dst4not=
					fi
					if running_ipv6; then
						local dst6not=
					fi
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						if running_ipv4; then
							local dst4not="!"
						fi
						if running_ipv6; then
							local dst6not="!"
						fi
					fi
					if running_ipv4; then
						test ${softwarnings} -eq 1 -a ! "${dst4}" = "default" && softwarning "Overwritting param: dst4 '${dst4}' becomes '${1}'"
						local dst4=$(ipv4 eval_param "${1}")
					fi
					if running_ipv6; then
						test ${softwarnings} -eq 1 -a ! "${dst6}" = "default" && softwarning "Overwritting param: dst6 '${dst6}' becomes '${1}'"
						local dst6=$(ipv6 eval_param "${1}")
					fi
				fi
				pop_namespace
				shift
				;;
				
			dst|DST|destination|DESTINATION|dst4|dst6)
				if [ "${1}" = "dst4" ]
				then
					if ! push_namespace ipv4; then return 1; fi
				elif [ "${1}" = "dst6" ]
				then
					if ! push_namespace ipv6; then return 1; fi
				else
					push_namespace "${FIREHOL_NS_CURR}"
				fi
				shift
				if [ ${reverse} -eq 0 ]
				then
					if running_ipv4; then
						local dst4not=
					fi
					if running_ipv6; then
						local dst6not=
					fi
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						if running_ipv4; then
							local dst4not="!"
						fi
						if running_ipv6; then
							local dst6not="!"
						fi
					fi
					if running_ipv4; then
						test ${softwarnings} -eq 1 -a ! "${dst4}" = "default" && softwarning "Overwritting param: dst4 '${dst4}' becomes '${1}'"
						local dst4=$(ipv4 eval_param "${1}")
					fi
					if running_ipv6; then
						test ${softwarnings} -eq 1 -a ! "${dst6}" = "default" && softwarning "Overwritting param: dst6 '${dst6}' becomes '${1}'"
						local dst6=$(ipv6 eval_param "${1}")
					fi
				else
					if running_ipv4; then
						local src4not=
					fi
					if running_ipv6; then
						local src6not=
					fi
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						if running_ipv4; then
							local src4not="!"
						fi
						if running_ipv6; then
							local src6not="!"
						fi
					fi
					if running_ipv4; then
						test ${softwarnings} -eq 1 -a ! "${src4}" = "default" && softwarning "Overwritting param: src6 '${src4}' becomes '${1}'"
						local src4=$(ipv4 eval_param "${1}")
					fi
					if running_ipv6; then
						test ${softwarnings} -eq 1 -a ! "${src6}" = "default" && softwarning "Overwritting param: src6 '${src6}' becomes '${1}'"
						local src6=$(ipv6 eval_param "${1}")
					fi
				fi
				pop_namespace
				shift
				;;
				
			srctype|SRCTYPE|sourcetype|SOURCETYPE)
				shift
				if [ ${reverse} -eq 0 ]
				then
					local srctypenot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						local srctypenot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${srctype}" = "" && softwarning "Overwritting param: srctype '${srctype}' becomes '${1}'"
					local srctype="`echo ${1} | ${SED_CMD} -e "s|^ \+||" -e "s| \+\$||" -e "s| \+|,|g" | ${TR_CMD} a-z A-Z`"
				else
					local dsttypenot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						local dsttypenot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${dsttype}" = "" && softwarning "Overwritting param: dsttype '${dsttype}' becomes '${1}'"
					local dsttype="`echo ${1} | ${SED_CMD} -e "s|^ \+||" -e "s| \+\$||" -e "s| \+|,|g" | ${TR_CMD} a-z A-Z`"
				fi
				shift
				;;
				
			dsttype|DSTTYPE|destinationtype|DESTINATIONTYPE)
				shift
				if [ ${reverse} -eq 0 ]
				then
					local dsttypenot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						local dsttypenot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${dsttype}" = "" && softwarning "Overwritting param: dsttype '${dsttype}' becomes '${1}'"
					local dsttype="`echo ${1} | ${SED_CMD} -e "s|^ \+||" -e "s| \+\$||" -e "s| \+|,|g" | ${TR_CMD} a-z A-Z`"
				else
					local srctypenot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						local srctypenot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${srctype}" = "" && softwarning "Overwritting param: srctype '${srctype}' becomes '${1}'"
					local srctype="`echo ${1} | ${SED_CMD} -e "s|^ \+||" -e "s| \+\$||" -e "s| \+|,|g" | ${TR_CMD} a-z A-Z`"
				fi
				shift
				;;
				
			sport|SPORT|sourceport|SOURCEPORT)
				shift
				if [ ${reverse} -eq 0 ]
				then
					local sportnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						local sportnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${sport}" = "any" && softwarning "Overwritting param: sport '${sport}' becomes '${1}'"
					local sport="${1}"
				else
					local dportnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						local dportnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${dport}" = "any" && softwarning "Overwritting param: dport '${dport}' becomes '${1}'"
					local dport="${1}"
				fi
				shift
				;;
				
			dport|DPORT|destinationport|DESTINATIONPORT)
				shift
				if [ ${reverse} -eq 0 ]
				then
					local dportnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						local dportnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${dport}" = "any" && softwarning "Overwritting param: dport '${dport}' becomes '${1}'"
					local dport="${1}"
				else
					local sportnot=
					if [ "${1}" = "not" -o "${1}" = "NOT" ]
					then
						shift
						local sportnot="!"
					fi
					test ${softwarnings} -eq 1 -a ! "${sport}" = "any" && softwarning "Overwritting param: sport '${sport}' becomes '${1}'"
					local sport="${1}"
				fi
				shift
				;;
				
			proto|PROTO|protocol|PROTOCOL)
				shift
				local protonot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					local protonot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${proto}" = "any" && softwarning "Overwritting param: proto '${proto}' becomes '${1}'"
				local proto="${1}"
				shift
				;;
				
			mark|MARK)
				shift
				local marknot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					local marknot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${mark}" = "any" && softwarning "Overwritting param: mark '${mark}' becomes '${1}'"
				local mark="${1}"
				shift
				;;
				
			tos|TOS)
				shift
				local tosnot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					local tosnot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${tos}" = "any" && softwarning "Overwritting param: tos '${tos}' becomes '${1}'"
				local tos="${1}"
				shift
				;;
				
			dscp|DSCP)
				shift
				local dscpnot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					local dscpnot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${dscp}" = "any" && softwarning "Overwritting param: dscp '${dscp}' becomes '${1}'"
				local dscp="${1}"
				shift
				
				if [ "${dscp}" = "class" ]
				then
					local dscptype="-class"
					local dscp="${1}"
					shift
				fi
				;;
				
			action|ACTION)
				test ${softwarnings} -eq 1 -a ! -z "${action}" && softwarning "Overwritting param: action '${action}' becomes '${2}'"
				local action="${2}"
				shift 2
				
				local -a action_param=()
				local action_is_chain=0
				case "${action}" in
					accept|ACCEPT)
						local action="ACCEPT"
						
						if [ "${1}" = "with" ]
						then
							shift
							
							case "${1}" in
								limit|LIMIT)
									local -a action_param=("limit" "${2}" "${3}")
									shift 3
									
									if [ "${1}" = "overflow" ]
									then
										local -a action_param[3]="overflow"
										local -a action_param[4]="${2}"
										shift 2
									fi
									;;
								
								recent|RECENT)
									local -a action_param=("recent" "${2}" "${3}" "${4}")
									shift 4
									;;
								
								knock|KNOCK)
									local -a action_param=("knock" "${2}")
									shift 2
									;;
								
								*)
									error "Cannot understand action's '${action}' directive '${1}'"
									return 1
									;;
							esac
						fi
						;;
						
					deny|DENY|drop|DROP)
						local action="DROP"
						;;
						
					reject|REJECT)
						local action="REJECT"
						if [ "${1}" = "with" ]
						then
							local -a action_param=("--reject-with" "${2}")
							shift 2
						else
							local -a action_param=("--reject-with" "auto")
						fi
						;;
						
					return|RETURN)
						local action="RETURN"
						;;
						
					mirror|MIRROR)
						local action="MIRROR"
						test $nomirror -eq 1 && action="REJECT"
						;;
						
					none|NONE)
						local action="NONE"
						;;
						
					snat|SNAT)
						local action="SNAT"
						if [ "${1}" = "to" ]
						then
							local -a action_param=()
							local x=
							for x in ${2}
							do
								local -a action_param=("${action_param[@]}" "--to-source" "${x}")
							done
							shift 2
						else
							error "${action} requires a 'to' argument."
							return 1
						fi
						if [ ! "A${table}" = "A-t nat" ]
						then
							error "${action} must on a the 'nat' table."
							return 1
						fi
						;;
						
					dnat|DNAT)
						local action="DNAT"
						if [ "${1}" = "to" ]
						then
							local -a action_param=()
							local x=
							for x in ${2}
							do
								local -a action_param=("${action_param[@]}" "--to-destination" "${x}")
							done
							shift 2
						else
							error "${action} requires a 'to' argument"
							return 1
						fi
						if [ ! "A${table}" = "A-t nat" ]
						then
							error "${action} must on a the 'nat' table."
							return 1
						fi
						;;
						
					redirect|REDIRECT)
						local action="REDIRECT"
						if [ "${1}" = "on-port" -o "${1}" = "to-port" -o "${1}" = "to" ]
						then
							local -a action_param=("--to-ports" "${2}")
							shift 2
						else
							error "${action} requires a 'to-port' or 'to' argument."
							return 1
						fi
						if [ ! "A${table}" = "A-t nat" ]
						then
							error "${action} must on a the 'nat' table."
							return 1
						fi
						;;
						
					tproxy|TPROXY)
						local action="TPROXY"
						local -a action_param=()
						if [ "${1}" = "mark" -o "${1}" = "tproxy-mark" ]
						then
							local -a action_param=("--tproxy-mark" "${2}")
							shift 2
						fi

						if [ "${1}" = "on-port" -o "${1}" = "to-port" -o "${1}" = "to" ]
						then
							local -a action_param=("${action_param[@]}" "--on-port" "${2}")
							shift 2
						else
							error "${action} requires a 'on-port' or 'on-ip' argument."
							return 1
						fi

						if [ "${1}" = "on-ip" -o "${1}" = "to-ip" ]
						then
							local -a action_param=("${action_param[@]}" "--on-ip" "${2}")
							shift 2
						fi

						if [ ! "A${table}" = "A-t mangle" ]
						then
							error "${action} cannot be on '$table', only on a the 'mangle' table."
							return 1
						fi
						;;
						
					tos|TOS)
						local action="TOS"
						if [ "${1}" = "to" ]
						then
							local -a action_param=("--set-tos" "${2}")
							shift 2
						else
							error "${action} requires a 'to' argument"
							return 1
						fi
						if [ ! "A${table}" = "A-t mangle" ]
						then
							error "${action} must on a the 'mangle' table."
							return 1
						fi
						;;
						
					mark|MARK)
						local action="MARK"
						if [ "${1}" = "to" ]
						then
							local -a action_param=("--set-mark" "${2}")
							shift 2
						else
							error "${action} requires a 'to' argument"
							return 1
						fi
						if [ ! "A${table}" = "A-t mangle" ]
						then
							error "${action} must on a the 'mangle' table."
							return 1
						fi
						;;
						
					connmark|CONNMARK)
						local action="CONNMARK"
						case "${1}" in
							to)
								local -a action_param=("--set-mark" "${2}")
								shift 2
								;;
							save)
								if [ "${2}" = "mask" ]
								then
									local -a action_param=("--save-mark" "--mask" "${3}")
									shift 3
								else
									local -a action_param=("--save-mark")
									shift 1
								fi
								;;
							restore)
								if [ "${2}" = "mask" ]
								then
									local -a action_param=("--restore-mark" "--mask" "${3}")
									shift 3
								else
									local -a action_param=("--restore-mark")
									shift 1
								fi
								;;
							*)
								error "${action} requires a either 'to', 'save' or 'restore' argument"
								return 1
								;;
						esac
						if [ ! "A${table}" = "A-t mangle" ]
						then
							error "${action} must on a the 'mangle' table."
							return 1
						fi
						;;
						
					dscp|DSCP)
						local action="DSCP"
						if [ "${1}" = "to" ]
						then
							if [ "${2}" = "class" ]
							then
								local -a action_param=("--set-dscp-class" "${2}")
								shift
							else
								local -a action_param=("--set-dscp" "${2}")
							fi
							shift 2
						else
							error "${action} requires a 'to' argument"
							return 1
						fi
						if [ ! "A${table}" = "A-t mangle" ]
						then
							error "${action} must on a the 'mangle' table."
							return 1
						fi
						;;
						
					tarpit|TARPIT)
						local action="TARPIT"
						;;
						
					*)
						chain_exists "${action}"
						local action_is_chain=$?
						;;
				esac
				;;
			
			state|STATE)
				shift
				local statenot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					local statenot="!"
				fi
				test ${softwarnings} -eq 1 -a ! -z "${state}" && softwarning "Overwritting param: state '${state}' becomes '${1}'"
				local state="${1}"
				shift
				;;
				
			user|USER|uid|UID)
				shift
				local uidnot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					test ${noowner} -eq 0 && local uidnot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${uid}" = "any" && softwarning "Overwritting param: uid '${uid}' becomes '${1}'"
				test ${noowner} -eq 0 && local uid="${1}"
				shift
				;;
				
			group|GROUP|gid|GID)
				shift
				local gidnot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					test ${noowner} -eq 0 && local gidnot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${gid}" = "any" && softwarning "Overwritting param: gid '${gid}' becomes '${1}'"
				test ${noowner} -eq 0 && local gid="${1}"
				shift
				;;
				
			process|PROCESS|pid|PID)
				shift
				local pidnot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					test ${noowner} -eq 0 && local pidnot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${pid}" = "any" && softwarning "Overwritting param: pid '${pid}' becomes '${1}'"
				test ${noowner} -eq 0 && local pid="${1}"
				shift
				;;
				
			session|SESSION|sid|SID)
				shift
				local sidnot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					test ${noowner} -eq 0 && local sidnot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${sid}" = "any" && softwarning "Overwritting param: sid '${sid}' becomes '${1}'"
				test ${noowner} -eq 0 && local sid="${1}"
				shift
				;;
				
			command|COMMAND|cmd|CMD)
				shift
				local cmdnot=
				if [ "${1}" = "not" -o "${1}" = "NOT" ]
				then
					shift
					test ${noowner} -eq 0 && local cmdnot="!"
				fi
				test ${softwarnings} -eq 1 -a ! "${cmd}" = "any" && softwarning "Overwritting param: cmd '${cmd}' becomes '${1}'"
				test ${noowner} -eq 0 && local cmd="${1}"
				shift
				;;
				
			custom|CUSTOM)
				test ${softwarnings} -eq 1 -a ! -z "${custom}" && softwarning "Overwritting param: custom '${custom}' becomes '${2}'"
				local custom="${2}"
				shift 2
				;;
				
			log|LOG)
				if [ ${nolog} -eq 0 ]
				then
					test ${softwarnings} -eq 1 -a ! -z "${log}" && softwarning "Overwritting param: log '${log}/${logtxt}' becomes 'normal/${2}'"
					local log=normal
					local logtxt="`echo ${2} | ${TR_CMD} " " "_"`"
				fi
				shift 2
				if [ "${1}" = "level" ]
				then
					local loglevel="${2}"
					shift 2
				else
					local loglevel="${FIREHOL_LOG_LEVEL}"
				fi
				;;
				
			loglimit|LOGLIMIT)
				if [ ${nolog} -eq 0 ]
				then
					test ${softwarnings} -eq 1 -a ! -z "${log}" && softwarning "Overwritting param: log '${log}/${logtxt}' becomes 'limit/${2}'"
					local log=limit
					local logtxt="`echo ${2} | ${TR_CMD} " " "_"`"
				fi
				shift 2
				if [ "${1}" = "level" ]
				then
					local loglevel="${2}"
					shift 2
				else
					local loglevel="${FIREHOL_LOG_LEVEL}"
				fi
				;;
				
			limit|LIMIT)
				test ${softwarnings} -eq 1 -a ! -z "${limit}" && softwarning "Overwritting param: limit '${limit}' becomes '${2}'"
				local limit="${2}"
				local burst="${3}"
				shift 3
				;;
				
			iplimit|IPLIMIT)
				test ${softwarnings} -eq 1 -a ! -z "${iplimit}" && softwarning "Overwritting param: iplimit '${iplimit}' becomes '${2}'"
				local iplimit="${2}"
				local iplimit_mask="${3}"
				shift 3
				;;
				
			in)	# this is incoming traffic - ignore packet ownership
				local noowner=1
				local nomirror=0
				local nomac=0
				shift
				;;
				
			out)	# this is outgoing traffic - ignore packet ownership if not in an interface
				if [ ! "${work_cmd}" = "interface" ]
				then
					local noowner=1
				else
					local nomirror=1
				fi
				local nomac=1
				shift
				;;
				
			nolog)
				local nolog=1
				shift
				;;
				
			noowner)
				local noowner=1
				shift
				;;
				
			softwarnings)
				local softwarnings=1
				shift
				;;
				
			nosoftwarnings)
				local softwarnings=0
				shift
				;;
				
			set_work_inface|SET_WORK_INFACE)
				local swi=1
				shift
				;;
				
			set_work_outface|SET_WORK_OUTFACE)
				local swo=1
				shift
				;;

			acct|accounting)
				if [ ${ENABLE_ACCOUNTING} -eq 1 ]
				then
					local accounting="$2"
					FIREHOL_NFACCT[$accounting]="1"
				elif [ ${ACCOUNTING_WARNING} -eq 1 ]
				then
					softwarning "Accounting is requested, but accounting is disabled. Is nfacct installed?"
					ACCOUNTING_WARNING=0
				fi
				shift 2
				;;
				
			*)
				error "Cannot understand directive '${1}'."
				return 1
				;;
		esac
	done
	
	test -z "${table}" && local table="-t filter"
	
	# If the user did not specified a rejection message,
	# we have to be smart and produce a tcp-reset if the protocol
	# is TCP and an ICMP port unreachable in all other cases.
	# The special case here is the protocol "any".
	# To accomplish the differentiation based on protocol we have
	# to change the protocol "any" to "tcp any"
	
	test "${action}" = "REJECT" -a "${action_param[1]}" = "auto" -a "${proto}" = "any" && local proto="tcp any"
	
	
	# we cannot accept empty strings to a few parameters, since this
	# will prevent us from generating a rule (due to nested BASH loops).
	test -z "${inface}"	&& error "Cannot accept an empty 'inface'."	&& return 1
	test -z "${outface}"	&& error "Cannot accept an empty 'outface'."	&& return 1
	test -z "${physin}"	&& error "Cannot accept an empty 'physin'."	&& return 1
	test -z "${physout}"	&& error "Cannot accept an empty 'physout'."	&& return 1
	test -z "${mac}"	&& error "Cannot accept an empty 'mac'."	&& return 1
	test -z "${src4}"	&& error "Cannot accept an empty 'src4'."	&& return 1
	test -z "${dst4}"	&& error "Cannot accept an empty 'dst4'."	&& return 1
	test -z "${src6}"	&& error "Cannot accept an empty 'src6'."	&& return 1
	test -z "${dst6}"	&& error "Cannot accept an empty 'dst6'."	&& return 1
	test -z "${sport}"	&& error "Cannot accept an empty 'sport'."	&& return 1
	test -z "${dport}"	&& error "Cannot accept an empty 'dport'."	&& return 1
	test -z "${proto}"	&& error "Cannot accept an empty 'proto'."	&& return 1
	test -z "${uid}"	&& error "Cannot accept an empty 'uid'."	&& return 1
	test -z "${gid}"	&& error "Cannot accept an empty 'gid'."	&& return 1
	test -z "${pid}"	&& error "Cannot accept an empty 'pid'."	&& return 1
	test -z "${sid}"	&& error "Cannot accept an empty 'sid'."	&& return 1
	test -z "${cmd}"	&& error "Cannot accept an empty 'cmd'."	&& return 1

	local physbridge="--physdev-is-bridged"
	if [ ! "${work_cmd}" = "router" -a ! "${physin}${physout}" = "anyany" ]
	then
		if [ ! "${physin}" = "any" -a "${physout}" = "any" ]
		then
			local physbridge="--physdev-is-in"
		elif [ "${physin}" = "any" -a ! "${physout}" = "any" ]
		then
			local physbridge="--physdev-is-out"
		fi
	fi

	local srcnot=
	local dstnot=
	if running_both; then
		if [ "${src4not}" != "${src6not}" ]
		then
			error "Mixed use of 'not' with src4 and src6."	&& return 1
		else
			local srcnot="${src4not}"
		fi
		if [ "${dst4not}" != "${dst6not}" ]
		then
			error "Mixed use of 'not' with dst4 and dst6."	&& return 1
		else
			local dstnot="${dst4not}"
		fi
		if [ "${src4}" = "default" -a "${src6}" != "default" ]
		then
			error "Must specify src4 when specifying src6"	&& return 1
		fi

		if [ "${dst4}" = "default" -a "${dst6}" != "default" ]
		then
			error "Must specify dst4 when specifying dst6"	&& return 1
		fi

		if [ "${src6}" = "default" -a "${src4}" != "default" ]
		then
			error "Must specify src6 when specifying src4"	&& return 1
		fi

		if [ "${dst6}" = "default" -a "${dst4}" != "default" ]
		then
			error "Must specify dst6 when specifying dst4"	&& return 1
		fi
	elif running_ipv6; then
		local srcnot="${src6not}"
		local dstnot="${dst6not}"
	else
		local srcnot="${src4not}"
		local dstnot="${dst4not}"
	fi

	test "${src4}" = "default" && local src4="any"
	test "${dst4}" = "default" && local dst4="any"
	test "${src6}" = "default" && local src6="any"
	test "${dst6}" = "default" && local dst6="any"

	# ----------------------------------------------------------------------------------
	# Do we have negative contitions?
	# If yes, we have to:
	#
	# case 1: If the action is a chain.
	#         Add to this chain positive RETURN statements matching all the negatives.
	#         The positive rules will be added bellow to the same chain and will be
	#         matched only if all RETURNs have not been matched.
	#
	# case 2: If the action is not a chain.
	#         Create a temporary chain, then add to this chain positive RETURN rules
	#         matching the negatives, and append at its end the final action (which is
	#         not a chain), then change the action of the positive rules to jump to
	#         this temporary chain.
	
	
	# ignore 'statenot', 'srctypenot', 'dsttypenot' since it is negated in the positive rules
	if [ ! -z "${infacenot}${outfacenot}${physinnot}${physoutnot}${macnot}${srcnot}${dstnot}${sportnot}${dportnot}${protonot}${uidnot}${gidnot}${pidnot}${sidnot}${cmdnot}${marknot}${tosnot}${dscpnot}" ]
	then
		if [ ${action_is_chain} -eq 1 ]
		then
			# if the action is a chain name, then just add the negative
			# expressions to this chain. Nothing more.
			
			local negative_chain="${action}"
			local negative_action=
		else
			# if the action is a native iptables action, then create
			# an intermidiate chain to store the negative expression,
			# and change the action of the rule to point to this action.
			
			# In this case, bellow we add after all negatives, the original
			# action of the rule.
			local DYNAMIC_CHAIN_COUNTER
			get_next_dynamic_counter DYNAMIC_CHAIN_COUNTER
			local negative_chain="${chain}.${DYNAMIC_CHAIN_COUNTER}"
			
			iptables_both ${table} -N "${negative_chain}"
			local negative_action="${action}"
			local action="${negative_chain}"
		fi
		
		
		if [ ! -z "${infacenot}" ]
		then
			local inf=
			for inf in ${inface}
			do
				iptables_both ${table} -A "${negative_chain}" -i "${inf}" -j RETURN
			done
			local infacenot=
			local inface=any
		fi
	
		if [ ! -z "${outfacenot}" ]
		then
			local outf=
			for outf in ${outface}
			do
				iptables_both ${table} -A "${negative_chain}" -o "${outf}" -j RETURN
			done
			local outfacenot=
			local outface=any
		fi
		
		if [ ! -z "${physinnot}" ]
		then
			local inph=
			for inph in ${physin}
			do
				iptables_both ${table} -A "${negative_chain}" -m physdev ${physbridge} --physdev-in "${inph}" -j RETURN
			done
			local physinnot=
			local physin=any
		fi
	
		if [ ! -z "${physoutnot}" ]
		then
			local outph=
			for outph in ${physout}
			do
				iptables_both ${table} -A "${negative_chain}" -m physdev ${physbridge} --physdev-out "${outph}" -j RETURN
			done
			local physoutnot=
			local physout=any
		fi
		
		if [ ! -z "${macnot}" ]
		then
			local m=
			for m in ${mac}
			do
				iptables_both ${table} -A "${negative_chain}" -m mac --mac-source "${m}" -j RETURN
			done
			local macnot=
			local mac=any
		fi
		
		if [ ! -z "${srcnot}" ]
		then
			local s=
			if running_ipv4; then
				for s in ${src4}
				do
					iptables ${table} -A "${negative_chain}" -s "${s}" -j RETURN
				done
			fi
			if running_ipv6; then
				for s in ${src6}
				do
					ip6tables ${table} -A "${negative_chain}" -s "${s}" -j RETURN
				done
			fi
			local srcnot=
			local src4=any
			local src6=any
		fi
		
		if [ ! -z "${dstnot}" ]
		then
			local d=
			if running_ipv4; then
				for d in ${dst4}
				do
					iptables ${table} -A "${negative_chain}" -d "${d}" -j RETURN
				done
			fi
			if running_ipv6; then
				for d in ${dst6}
				do
					ip6tables ${table} -A "${negative_chain}" -d "${d}" -j RETURN
				done
			fi
			local dstnot=
			local dst4=any
			local dst6=any
		fi
		
		if [ ! -z "${protonot}" ]
		then
			if [ ! -z "${sportnot}" -o ! -z "${dportnot}" ]
			then
				error "Cannot have negative protocol(s) and source/destination port(s)."
				return 1
			fi
			
			local pr=
			for pr in ${proto}
			do
				iptables_both ${table} -A "${negative_chain}" -p "${pr}" -j RETURN
			done
			local protonot=
			local proto=any
		fi
		
		if [ ! -z "${sportnot}" ]
		then
			if [ "${proto}" = "any" ]
			then
				error "Cannot have negative source port specification without protocol."
				return 1
			fi
			
			local sp=
			for sp in ${sport}
			do
				local pr=
				for pr in ${proto}
				do
					iptables_both ${table} -A "${negative_chain}" -p "${pr}" --sport "${sp}" -j RETURN
				done
			done
			local sportnot=
			local sport=any
		fi
		
		if [ ! -z "${dportnot}" ]
		then
			if [ "${proto}" = "any" ]
			then
				error "Cannot have negative destination port specification without protocol."
				return 1
			fi
			
			local dp=
			for dp in ${dport}
			do
				local pr=
				for pr in ${proto}
				do
					iptables_both ${table} -A "${negative_chain}" -p "${pr}" --dport "${dp}" -j RETURN
				done
			done
			local dportnot=
			local dport=any
		fi
		
		if [ ! -z "${uidnot}" ]
		then
			local tuid=
			for tuid in ${uid}
			do
				iptables_both ${table} -A "${negative_chain}" -m owner --uid-owner "${tuid}" -j RETURN
			done
			local uidnot=
			local uid=any
		fi
		
		if [ ! -z "${gidnot}" ]
		then
			local tgid=
			for tgid in ${gid}
			do
				iptables_both ${table} -A "${negative_chain}" -m owner --gid-owner "${tgid}" -j RETURN
			done
			local gidnot=
			local gid=any
		fi
		
		if [ ! -z "${pidnot}" ]
		then
			local tpid=
			for tpid in ${pid}
			do
				iptables_both ${table} -A "${negative_chain}" -m owner --pid-owner "${tpid}" -j RETURN
			done
			local pidnot=
			local pid=any
		fi
		
		if [ ! -z "${sidnot}" ]
		then
			local tsid=
			for tsid in ${sid}
			do
				iptables_both ${table} -A "${negative_chain}" -m owner --sid-owner "${tsid}" -j RETURN
			done
			local sidnot=
			local sid=any
		fi
		
		if [ ! -z "${cmdnot}" ]
		then
			local tcmd=
			for tcmd in ${cmd}
			do
				iptables_both ${table} -A "${negative_chain}" -m owner --cmd-owner "${tcmd}" -j RETURN
			done
			local cmdnot=
			local cmd=any
		fi
		
		if [ ! -z "${marknot}" ]
		then
			local tmark=
			for tmark in ${mark}
			do
				iptables_both ${table} -A "${negative_chain}" -m mark --mark "${tmark}" -j RETURN
			done
			local marknot=
			local mark=any
		fi
		
		if [ ! -z "${tosnot}" ]
		then
			local ttos=
			for ttos in ${tos}
			do
				iptables_both ${table} -A "${negative_chain}" -m tos --tos "${ttos}" -j RETURN
			done
			local tosnot=
			local tos=any
		fi
		
		if [ ! -z "${dscpnot}" ]
		then
			local tdscp=
			for tdscp in ${dscp}
			do
				iptables_both ${table} -A "${negative_chain}" -m dscp --dscp${dscptype} "${tdscp}" -j RETURN
			done
			local dscp=any
			local dscpnot=
		fi
		
		
		# in case this is temporary chain we created for the negative expression,
		# just make it have the final action of the rule.
		if [ ! -z "${negative_action}" ]
		then
			local pr=
			for pr in ${proto}
			do
				local -a proto_arg=()
				
				case ${pr} in
					any|ANY)
						;;
					
					*)
						local -a proto_arg=("-p" "${pr}")
						;;
				esac
				
				if running_ipv4; then
					rule_action_param iptables "${negative_action}" "${pr}" "" "" "${table}" "${action_param[@]}" -- ${table} -A "${negative_chain}" "${proto_arg[@]}" || local failed=$[failed + 1]
				fi
				if running_ipv6; then
					rule_action_param ip6tables "${negative_action}" "${pr}" "" "" "${table}" "${action_param[@]}" -- ${table} -A "${negative_chain}" "${proto_arg[@]}" || local failed=$[failed + 1]
				fi
				local -a action_param=()
			done
		fi
	fi
	
	
	# ----------------------------------------------------------------------------------
	# Process the positive rules

	# addrtype (srctype, dsttype)
	local -a addrtype_arg=()
	local -a stp_arg=()
	local -a dtp_arg=()
	if [ ! -z "${srctype}${dsttype}" ]
	then
		local -a addrtype_arg=("-m" "addrtype")

		if [ ! -z "${srctype}" ]
		then
			local -a stp_arg=(${srctypenot} "--src-type" "${srctype}")
		fi

		if [ ! -z "${dsttype}" ]
		then
			local -a dtp_arg=(${dsttypenot} "--dst-type" "${dsttype}")
		fi
	fi

	# state
	local -a state_arg=()
	if [ ! -z "${state}" ]
	then
		# local -a state_arg=("-m" "state" ${statenot} "--state" "${state}")
		local -a state_arg=("-m" "conntrack" ${statenot} "--ctstate" "${state}")
	fi

	# limit
	local -a limit_arg=()
	if [ ! -z "${limit}" ]
	then
		local -a limit_arg=("-m" "limit" "--limit" "${limit}" "--limit-burst" "${burst}")
	fi

	# iplimit
	local -a iplimit_arg=()
	if [ ! -z "${iplimit}" ]
	then
		local -a iplimit_arg=("-m" "iplimit" "--iplimit-above" "${iplimit}" "--iplimit-mask" "${iplimit_mask}")
	fi

	# log mode selection
	local -a logopts_arg=()
	if [ "${FIREHOL_LOG_MODE}" = "ULOG" ]
	then
		local -a logopts_arg=("--ulog-prefix=${FIREHOL_LOG_PREFIX}${logtxt}:")
	elif [ "${FIREHOL_LOG_MODE}" = "NFLOG" ]
	then
		local -a logopts_arg=("--nflog-prefix=${FIREHOL_LOG_PREFIX}${logtxt}:")
	else
		local -a logopts_arg=("--log-level" "${loglevel}" "--log-prefix=${FIREHOL_LOG_PREFIX}${logtxt}:")
	fi

	# log / loglimit
	local logrule=
	case "${log}" in
		'')
			local logrule=none
			;;

		limit)
			local logrule=limit
			;;

		normal)
			local logrule=normal
			;;

		*)
			error "Unknown log value '${log}'."
			;;
	esac
	
	# uid
	local tuid=
	for tuid in ${uid}
	do
		local -a uid_arg=()
		local -a owner_arg=()
		
		case ${tuid} in
			any|ANY)
				;;
			
			*)
				local -a owner_arg=("-m" "owner")
				local -a uid_arg=("--uid-owner" "${tuid}")
				;;
		esac
	
	# gid
	local tgid=
	for tgid in ${gid}
	do
		local -a gid_arg=()
		
		case ${tgid} in
			any|ANY)
				;;
			
			*)
				local -a owner_arg=("-m" "owner")
				local -a gid_arg=("--gid-owner" "${tgid}")
				;;
		esac
	
	# pid
	local tpid=
	for tpid in ${pid}
	do
		local -a pid_arg=()
		
		case ${tpid} in
			any|ANY)
				;;
			
			*)
				local -a owner_arg=("-m" "owner")
				local -a pid_arg=("--pid-owner" "${tpid}")
				;;
		esac
	
	# sid
	local tsid=
	for tsid in ${sid}
	do
		local -a sid_arg=()
		
		case ${tsid} in
			any|ANY)
				;;
			
			*)
				local -a owner_arg=("-m" "owner")
				local -a sid_arg=("--sid-owner" "${tsid}")
				;;
		esac
	
	# cmd
	local tcmd=
	for tcmd in ${cmd}
	do
		local -a cmd_arg=()
		
		case ${tcmd} in
			any|ANY)
				;;
			
			*)
				local -a owner_arg=("-m" "owner")
				local -a cmd_arg=("--cmd-owner" "${tcmd}")
				;;
		esac
	
	# mark
	local tmark=
	for tmark in ${mark}
	do
		local -a mark_arg=()
		
		case ${tmark} in
			any|ANY)
				;;
			
			*)
				local -a mark_arg=("-m" "mark" "--mark" "${tmark}")
				;;
		esac
	
	# tos
	local ttos=
	for ttos in ${tos}
	do
		local -a tos_arg=()
		
		case ${ttos} in
			any|ANY)
				;;
			
			*)
				local -a tos_arg=("-m" "tos" "--tos" "${ttos}")
				;;
		esac
	
	# dscp
	local tdscp=
	for tdscp in ${dscp}
	do
		local -a dscp_arg=()
		
		case ${tdscp} in
			any|ANY)
				;;
			
			*)
				local -a dscp_arg=("-m" "dscp" "--dscp${dscptype}" "${tdscp}")
				;;
		esac
	
	# proto
	local pr=
	for pr in ${proto}
	do
		local -a proto_arg=()
		
		case ${pr} in
			any|ANY)
				;;
			
			*)
				local -a proto_arg=("-p" "${pr}")
				;;
		esac
	
	# inface
	local inf=
	for inf in ${inface}
	do
		local -a inf_arg=()
		case ${inf} in
			any|ANY)
				;;
			
			*)
				local -a inf_arg=("-i" "${inf}")
				;;
		esac
	
	# outface
	local outf=
	for outf in ${outface}
	do
		local -a outf_arg=()
		case ${outf} in
			any|ANY)
				;;
			
			*)
				local -a outf_arg=("-o" "${outf}")
				;;
		esac
	
	# physin
	local inph=
	for inph in ${physin}
	do
		local -a inph_arg=()
		case ${inph} in
			any|ANY)
				;;
			
			*)
				local -a physdev_arg=("-m" "physdev" ${physbridge})
				local -a inph_arg=("--physdev-in" "${inph}")
				;;
		esac
	
	# physout
	local outph=
	for outph in ${physout}
	do
		local -a outph_arg=()
		case ${outph} in
			any|ANY)
				;;
			
			*)
				local -a physdev_arg=("-m" "physdev" ${physbridge})
				local -a outph_arg=("--physdev-out" "${outph}")
				;;
		esac
	
	# sport
	local sp=
	for sp in ${sport}
	do
		local -a sp_arg=()
		case ${sp} in
			any|ANY)
				;;
			
			*)
				local -a sp_arg=("--sport" "${sp}")
				;;
		esac
	
	# dport
	local dp=
	for dp in ${dport}
	do
		local -a dp_arg=()
		case ${dp} in
			any|ANY)
				;;
			
			*)
				local -a dp_arg=("--dport" "${dp}")
				;;
		esac
	
	# mac
	local mc=
	for mc in ${mac}
	do
		local -a mc_arg=()
		case ${mc} in
			any|ANY)
				;;
			
			*)
				local -a mc_arg=("-m" "mac" "--mac-source" "${mc}")
				;;
		esac
	
	if running_ipv4; then
		# src4
		local s=
		for s in ${src4}
		do
			local -a s_arg=()
			case ${s} in
				any|ANY)
					;;

				*)
					local -a s_arg=("-s" "${s}")
					;;
			esac

		# dst4
		local d=
		for d in ${dst4}
		do
			local -a d_arg=()
			case ${d} in
				any|ANY)
					;;

				*)
					local -a d_arg=("-d" "${d}")
					;;
			esac

		# build the command
		declare -a basecmd=("${inf_arg[@]}" "${outf_arg[@]}" "${physdev_arg[@]}" "${inph_arg[@]}" "${outph_arg[@]}" "${limit_arg[@]}" "${iplimit_arg[@]}" "${proto_arg[@]}" "${s_arg[@]}" "${sp_arg[@]}" "${d_arg[@]}" "${dp_arg[@]}" "${owner_arg[@]}" "${uid_arg[@]}" "${gid_arg[@]}" "${pid_arg[@]}" "${sid_arg[@]}" "${cmd_arg[@]}" "${addrtype_arg[@]}" "${stp_arg[@]}" "${dtp_arg[@]}" "${state_arg[@]}" "${mc_arg[@]}" "${mark_arg[@]}" "${tos_arg[@]}" "${dscp_arg[@]}")

		if [ "$logrule" = "limit" ]
		then
			iptables ${table} -A "${chain}" "${basecmd[@]}" ${custom} -m limit --limit "${FIREHOL_LOG_FREQUENCY}" --limit-burst "${FIREHOL_LOG_BURST}" -j ${FIREHOL_LOG_MODE} ${FIREHOL_LOG_OPTIONS} "${logopts_arg[@]}"
		elif [ "$logrule" = "normal" ]
		then
			iptables ${table} -A "${chain}" "${basecmd[@]}" ${custom} -j ${FIREHOL_LOG_MODE} ${FIREHOL_LOG_OPTIONS} "${logopts_arg[@]}"
		fi

		if [ ! -z "${accounting}" ]
		then
			iptables ${table} -A "${chain}" "${basecmd[@]}" ${custom} -m nfacct --nfacct-name "${accounting}"
		fi

		# do it!
		rule_action_param iptables "${action}" "${pr}" "${statenot}" "${state}" "${table}" "${action_param[@]}" -- ${table} -A "${chain}" "${basecmd[@]}" ${custom} || local failed=$[failed + 1]

		done # dst4
		done # src4
	fi

	if running_ipv6; then
		# src6
		local s=
		for s in ${src6}
		do
			local -a s_arg=()
			case ${s} in
				any|ANY)
					;;

				*)
					local -a s_arg=("-s" "${s}")
					;;
			esac

		# dst6
		local d=
		for d in ${dst6}
		do
			local -a d_arg=()
			case ${d} in
				any|ANY)
					;;

				*)
					local -a d_arg=("-d" "${d}")
					;;
			esac

		# build the command
		declare -a basecmd=("${inf_arg[@]}" "${outf_arg[@]}" "${physdev_arg[@]}" "${inph_arg[@]}" "${outph_arg[@]}" "${limit_arg[@]}" "${iplimit_arg[@]}" "${proto_arg[@]}" "${s_arg[@]}" "${sp_arg[@]}" "${d_arg[@]}" "${dp_arg[@]}" "${owner_arg[@]}" "${uid_arg[@]}" "${gid_arg[@]}" "${pid_arg[@]}" "${sid_arg[@]}" "${cmd_arg[@]}" "${addrtype_arg[@]}" "${stp_arg[@]}" "${dtp_arg[@]}" "${state_arg[@]}" "${mc_arg[@]}" "${mark_arg[@]}" "${tos_arg[@]}" "${dscp_arg[@]}")

		if [ "$logrule" = "limit" ]
		then
			ip6tables ${table} -A "${chain}" "${basecmd[@]}" ${custom} -m limit --limit "${FIREHOL_LOG_FREQUENCY}" --limit-burst "${FIREHOL_LOG_BURST}" -j ${FIREHOL_LOG_MODE} ${FIREHOL_LOG_OPTIONS} "${logopts_arg[@]}"
		elif [ "$logrule" = "normal" ]
		then
			ip6tables ${table} -A "${chain}" "${basecmd[@]}" ${custom}  -j ${FIREHOL_LOG_MODE} ${FIREHOL_LOG_OPTIONS} "${logopts_arg[@]}"
		fi

		if [ ! -z "${accounting}" ]
		then
			iptables ${table} -A "${chain}" "${basecmd[@]}" ${custom} -m nfacct --nfacct-name "${accounting}"
		fi

		# do it!
		rule_action_param ip6tables "${action}" "${pr}" "${statenot}" "${state}" "${table}" "${action_param[@]}" -- ${table} -A "${chain}" "${basecmd[@]}" ${custom} || local failed=$[failed + 1]

		done # dst6
		done # src6
	fi

	done # mac
	done # dport
	done # sport
	done # physout
	done # physin
	done # outface
	done # inface
	done # proto
	done # dscp
	done # tos
	done # mark
	done # cmd
	done # sid
	done # pid
	done # gid
	done # uid
	
	test ${failed} -gt 0 && error "There are ${failed} failed commands." && return 1
	return 0
}

warning() {
	echo >&2
	echo >&2 "WARNING: " "$@"
	echo >&2
	
	return 0
}

softwarning() {
	echo >&2
	echo >&2 "--------------------------------------------------------------------------------"
	echo >&2 "WARNING"
	echo >&2 "WHAT   : ${work_function}"
	echo >&2 "WHY    :" "$@"
	printf >&2 "COMMAND: "; printf >&2 "%q " "${work_realcmd[@]}"; echo >&2
	echo >&2 "MODE   :" "${FIREHOL_NS_CURR}"
	echo >&2 "SOURCE : line ${FIREHOL_LINEID} of ${FIREHOL_CONFIG}"
	echo >&2
	
	return 0
}

# ------------------------------------------------------------------------------
# error - error reporting while still parsing the configuration file
# WHY:
# This is the error handler that presents to the user detected errors during
# processing FireHOL's configuration file.
# This command is directly called by other functions of FireHOL.

error() {
	test "${FIREHOL_MODE}" = "START" && syslog err "Error '${@}' when '${work_function}' at ${FIREHOL_CONFIG} line ${FIREHOL_LINEID}"
	
	work_error=$[work_error + 1]
	echo >&2
	echo >&2 "--------------------------------------------------------------------------------"
	echo >&2 "ERROR #: ${work_error}"
	echo >&2 "WHAT   : ${work_function}"
	echo >&2 "WHY    :" "$@"
	printf >&2 "COMMAND: "; printf >&2 "%q " "${work_realcmd[@]}"; echo >&2
	echo >&2 "MODE   :" "${FIREHOL_NS_CURR}"
	echo >&2 "SOURCE : line ${FIREHOL_LINEID} of ${FIREHOL_CONFIG}"
	echo >&2
	
	return 0
}


# ------------------------------------------------------------------------------
# runtime_error - postprocessing evaluation of commands run
# WHY:
# The generated iptables commands must be checked for errors in case they fail.
# This command is executed after every postprocessing command to find out
# if it has been successfull or failed.

runtime_error() {
	local type="ERROR"
	local id=
	
	case "${1}" in
		error)
			local type="ERROR  "
			work_runtime_error=$[work_runtime_error + 1]
			local id="# ${work_runtime_error}."
			;;
			
		warn)
			local type="WARNING"
			local id="This might or might not affect the operation of your firewall."
			;;
		
		*)
			work_runtime_error=$[work_runtime_error + 1]
			local id="# ${work_runtime_error}."
			
			echo >&2
			echo >&2
			echo >&2 "*** unsupported final status type '${1}'. Assuming it is 'ERROR'"
			echo >&2
			echo >&2
			;;
	esac
	shift
	
	local ret="${1}"; shift
	local line="${1}"; shift
	
	syslog err "Runtime ${type} '${id}'. Source ${FIREHOL_CONFIG} line ${line}"
	
	echo >&2
	echo >&2
	echo >&2 "--------------------------------------------------------------------------------"
	echo >&2 "${type} : ${id}"
	echo >&2 "WHAT    : A runtime command failed to execute (returned error ${ret})."
	echo >&2 "SOURCE  : line ${line} of ${FIREHOL_CONFIG}"
	printf >&2 "COMMAND : "
	printf >&2 "%q " "$@"
	printf >&2 "\n"
	echo >&2 "OUTPUT  : "
	echo >&2
	${CAT_CMD} ${FIREHOL_OUTPUT}.log >&2
	echo >&2
	
	return 0
}


# ------------------------------------------------------------------------------
# chain_exists - find if chain name has already being specified
# WHY:
# We have to make sure each service gets its own chain.
# Although FireHOL chain naming makes chains with unique names, this is just
# an extra sanity check.

declare -A FIREHOL_NFACCT=()
declare -A FIREHOL_CHAINS=()
chain_exists() {
	local chain="${1}"

	if running_ipv4; then
		test ! -z "${FIREHOL_CHAINS[${chain}.4]}" && return 1
		# test -f "${FIREHOL_CHAINS_DIR}/${chain}.4" && return 1
	fi
	if running_ipv6; then
		test ! -z "${FIREHOL_CHAINS[${chain}.6]}" && return 1
		# test -f "${FIREHOL_CHAINS_DIR}/${chain}.6" && return 1
	fi
	
	return 0
}


# ------------------------------------------------------------------------------
# create_chain - create a chain and link it to the firewall
# WHY:
# When a chain is created it must somehow to be linked to the rest of the
# firewall apropriately. This function first creates the chain and then
# it links it to its final position within the generated firewall.

create_chain() {
	local table="${1}"
	local newchain="${2}"
	local oldchain="${3}"
	shift 3
	
	set_work_function "Creating chain '${newchain}' under '${oldchain}' in table '${table}'"
	
	chain_exists "${newchain}"
	test $? -eq 1 && error "Chain '${newchain}' already exists." && return 1
	
	iptables_both -t ${table} -N "${newchain}" || return 1
	if running_ipv4; then
		FIREHOL_CHAINS[${newchain}.4]="1"
		#${TOUCH_CMD} "${FIREHOL_CHAINS_DIR}/${newchain}.4"
	fi
	if running_ipv6; then
		FIREHOL_CHAINS[${newchain}.6]="1"
		#${TOUCH_CMD} "${FIREHOL_CHAINS_DIR}/${newchain}.6"
	fi
	
	if [ ! -z "${oldchain}" ]
	then
		rule table ${table} chain "${oldchain}" action "${newchain}" "$@" || return 1
	fi
	
	return 0
}


# ------------------------------------------------------------------------------
# smart_function - find the valid service definition for a service
# WHY:
# FireHOL supports simple and complex services. This function first tries to
# detect if there are the proper variables set for a simple service, and if
# they do not exist, it then tries to find the complex function definition for
# the service.
#
# Additionally, it creates a chain for the subcommand.

smart_function() {
	local type="${1}"	# The current subcommand: server/client/route
	local services="${2}"	# The services to implement
	shift 2
	
	local service=
	for service in $services
	do
		local servname="${service}"
		test "${service}" = "custom" && local servname="${1}"
		
		set_work_function "Preparing for service '${service}' of type '${type}' under interface '${work_name}'"
		
		# Increase the command counter, to make all chains within a primary
		# command, unique.
		local work_counter
		get_next_work_counter work_counter
		
		local suffix="u${work_counter}"
		case "${type}" in
			client)
				suffix="c${work_counter}"
				;;
			
			server)
				suffix="s${work_counter}"
				;;
			
			route)
				suffix="r${work_counter}"
				;;
			
			*)	error "Cannot understand type '${type}'."
				return 1
				;;
		esac
		
		local mychain="${work_name}_${servname}_${suffix}"
		
		create_chain filter "in_${mychain}" "in_${work_name}" || return 1
		create_chain filter "out_${mychain}" "out_${work_name}" || return 1
		
		# Try the simple services first
		simple_service "${mychain}" "${type}" "${service}" "$@"
		local ret=$?
		
		# simple service completed succesfully.
		test $ret -eq 0 && continue
		
		# simple service exists but failed.
		if [ $ret -ne 127 ]
		then
			error "Simple service '${service}' returned an error ($ret)."
			return 1
		fi
		
		
		# Try the custom services
		local fn="rules_${service}"
		
		set_work_function "Running complex rules function ${fn}() for ${type} '${service}'"
		
		"${fn}" "${mychain}" "${type}" "$@"
		local ret=$?
		test $ret -eq 0 && continue
		
		if [ $ret -eq 127 ]
		then
			error "There is no service '${service}' defined."
		else
			error "Complex service '${service}' returned an error ($ret)."
		fi
		return 1
	done
	
	return 0
}

# ------------------------------------------------------------------------------
# simple_service - convert a service definition to an inline service definition
# WHY:
# When a simple service is detected, there must be someone to call
# rules_custom() with the appropriate service definition parameters.

simple_service() {
	local mychain="${1}"; shift
	local type="${1}"; shift
	local server="${1}"; shift
	
	local server_varname="server_${server}_ports"
	eval local server_ports="\$${server_varname}"
	
	local client_varname="client_${server}_ports"
	eval local client_ports="\$${client_varname}"
	
	if [ ! -z "${server_ports}" -a -z "${client_ports}" ]
	then
		error "Simple service '${service}' has server ports, but no client ports defined."
		return 1
	elif [ -z "${server_ports}" -a ! -z "${client_ports}" ]
	then
		error "Simple service '${service}' has client ports, but no server ports defined."
		return 1
	elif [ -z "${server_ports}" -a -z "${client_ports}" ]
	then
		# this will make the caller attempt to find a complex service
		return 127
	fi
	
	local varname="helper_${server}"
	eval local helpers="\$${varname}"
	
	local x=
	local varname="require_${server}_modules"
	eval local value="\$${varname}"
	for x in ${value}
	do
		require_kernel_module $x || return 1
	done
	
	if [ ${FIREHOL_NAT} -eq 1 ]
	then
		local varname="require_${server}_nat_modules"
		eval local value="\$${varname}"
		for x in ${value}
		do
			require_kernel_module $x || return 1
		done
	fi
	
	# load the helper modules
	for x in ${helpers}
	do
		case "${x}" in
			snmp_basic)	# this does not exist in conntrack
					;;
					
			*)		require_kernel_module nf_conntrack_$x
					;;
		esac
		
		if [ ${FIREHOL_NAT} -eq 1 ]
		then
			case "${x}" in
				netbios_ns|netlink|sane)
					# these do not exist in nat
					;;
					
				*)	require_kernel_module nf_nat_$x
					;;
			esac
		fi
	done
	
	set_work_function "Running simple rules for  ${type} '${service}'"
	rules_custom "${mychain}" "${type}" "${server}" "${server_ports}" "${client_ports}" helpers "${helpers}" "$@"
	
	return $?
}

show_work_realcmd() {
	test "${FIREHOL_MODE}" = "EXPLAIN" && return 0
	
	(
		printf "\n\n"
		printf "# === CONFIGURATION STATEMENT =================================================\n"
		printf "# CONF:%3s>>>	" ${FIREHOL_LINEID}
		
		case $1 in
			2)	printf "	"
				;;
			*)	;;
		esac
		
		printf "%q " "${work_realcmd[@]}"
		printf "\n\n"
	) >>${FIREHOL_OUTPUT}
}

work_realcmd_primary() {
	work_realcmd=("$@")
	test ${FIREHOL_CONF_SHOW} -eq 1 && show_work_realcmd 1
}

work_realcmd_secondary() {
	work_realcmd=("$@")
	test ${FIREHOL_CONF_SHOW} -eq 1 && show_work_realcmd 2
}

work_realcmd_helper() {	
	work_realcmd=("$@")
	test ${FIREHOL_CONF_SHOW} -eq 1 && show_work_realcmd 3
}

wait_for_interface() {
	local iface=$1; shift
	local timeout=60

	if [ -n "$1" ]; then
		timeout=$1
	fi

	local start=`date +%s`
	local found=0

	while [ "`date +%s`" -lt $(($start+$timeout)) -a $found -eq 0 ]
	do
		local addr=`ip addr show $iface 2> /dev/null | awk '$1 ~ /^inet$/ {print $2}'`
		if [ -n "$addr" ]
		then
			found=1
		fi
		if [ $found -eq 0 ]
		then
			sleep 0.5
		fi
	done

	if [ $found -eq 1 ]
	then
		# the interface is up
		return 0
	else
		return 1
	fi
}


# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# keep a copy of the running firewall on disk for fast restoration

fixed_save() {
	local command="$1"
	local tmp="${FIREHOL_DIR}/iptables-save-$$"
	local err=
	
	load_kernel_module ip_tables
	${command} -c >$tmp
	err=$?
	if [ ! $err -eq 0 ]
	then
		${RM_CMD} -f $tmp >/dev/null 2>&1
		return $err
	fi
	
	${CAT_CMD} ${tmp} |\
		${SED_CMD} \
			-e "s/--uid-owner !/! --uid-owner /g"	\
			-e "s/--gid-owner !/! --gid-owner /g"	\
			-e "s/--pid-owner !/! --pid-owner /g"	\
			-e "s/--sid-owner !/! --sid-owner /g"	\
			-e "s/--cmd-owner !/! --cmd-owner /g"
	err=$?
	
	${RM_CMD} -f $tmp >/dev/null 2>&1
	return $err
}

FIREHOL_LAST_SUCCESSFUL_COMMAND="${FIREHOL_SPOOL_DIR}/firehol-last-ok-command"
firehol_save_activated_firewall() {
	echo -n $"FireHOL: Saving activated firewall to ${FIREHOL_SPOOL_DIR}:"
	
	if [ -f "${FIREHOL_SPOOL_DIR}/ipv4.enable" ]
	then
		fixed_save ${IPTABLES_SAVE_CMD} >"${FIREHOL_SPOOL_DIR}/ipv4.rules"
		if [ ! $? -eq 0 ]
		then
			failure $"FireHOL: Saving activated firewall to ${FIREHOL_SPOOL_DIR}:"
			echo
			return 1
		fi
		
		"${CHOWN_CMD}" root:root "${FIREHOL_SPOOL_DIR}/ipv4.rules"
		"${CHMOD_CMD}" 600 "${FIREHOL_SPOOL_DIR}/ipv4.rules"
	else
		test -f "${FIREHOL_SPOOL_DIR}/ipv4.rules" && rm "${FIREHOL_SPOOL_DIR}/ipv4.rules"
	fi
	
	if [ -f "${FIREHOL_SPOOL_DIR}/ipv6.enable" ]
	then
		fixed_save ${IP6TABLES_SAVE_CMD} >"${FIREHOL_SPOOL_DIR}/ipv6.rules"
		if [ ! $? -eq 0 ]
		then
			failure $"FireHOL: Saving activated firewall to ${FIREHOL_SPOOL_DIR}:"
			echo
			return 1
		fi
		
		"${CHOWN_CMD}" root:root "${FIREHOL_SPOOL_DIR}/ipv6.rules"
		"${CHMOD_CMD}" 600 "${FIREHOL_SPOOL_DIR}/ipv6.rules"
	else
		test -f "${FIREHOL_SPOOL_DIR}/ipv6.rules" && rm "${FIREHOL_SPOOL_DIR}/ipv6.rules"
	fi

	printf "%q " "${FIREHOL_ARGS[@]}" >"${FIREHOL_LAST_SUCCESSFUL_COMMAND}"
	printf "\n" >>"${FIREHOL_LAST_SUCCESSFUL_COMMAND}"

	success $"FireHOL: Saving activated firewall to ${FIREHOL_SPOOL_DIR}:"
	echo
	
	return 0
}

firehol_can_restore_saved_firewall() {
	test ! -f "${FIREHOL_LAST_SUCCESSFUL_COMMAND}" \
		&& warning "No saved firewall found to restore." \
		&& return 1

	local args="`printf "%q " "${FIREHOL_ARGS[@]}"`"
	local old_args="`cat "${FIREHOL_LAST_SUCCESSFUL_COMMAND}"`"
	test ! "${args}" = "${old_args}" \
		&& warning "Saved firewall cannot be restored because it was run with different parameters." \
		&& return 2

	local do_ipv4=0
	local do_ipv6=0
	test -f "${FIREHOL_SPOOL_DIR}/ipv4.enable" -a -f "${FIREHOL_SPOOL_DIR}/ipv4.rules" && local do_ipv4=1
	test -f "${FIREHOL_SPOOL_DIR}/ipv6.enable" -a -f "${FIREHOL_SPOOL_DIR}/ipv6.rules" && local do_ipv6=1
	test "${do_ipv4}${do_ipv6}" = "00" \
		&& warning "Saved firewall includes neither IPv4 nor IPv6 rules to restore." \
		&& return 1

	test "${FIREHOL_CONFIG}" -nt "${FIREHOL_LAST_SUCCESSFUL_COMMAND}" \
		&& warning "${FIREHOL_CONFIG} is newer than saved firewall. Cannot restore saved firewall." \
		&& return 3

	test ! -z "`${FIND_CMD} "${FIREHOL_CONFIG_DIR}" -newer "${FIREHOL_LAST_SUCCESSFUL_COMMAND}"`" \
		&& warning "${FIREHOL_CONFIG_DIR} has updated files. Cannot restore saved firewall." \
		&& return 4

	test ! -z "`${FIND_CMD} "${FIREHOL_SERVICES_DIR}" -newer "${FIREHOL_LAST_SUCCESSFUL_COMMAND}"`" \
		&& warning "${FIREHOL_SERVICES_DIR} has updated files. Cannot restore saved firewall." \
		&& return 5

	return 0
}

firehol_restore_last_activated_firewall() {
	firehol_can_restore_saved_firewall || return 2

	echo -n $"FireHOL: Restoring last activated firewall from ${FIREHOL_SPOOL_DIR}:"

	if [ -x "${FIREHOL_SPOOL_DIR}/firewall_restore_commands.sh" ]
	then
		"${FIREHOL_SPOOL_DIR}/firewall_restore_commands.sh" >/dev/null
		if [ $? -ne 0 ]
			then
			warning "Failed to execute restoration script."
			failure $"FireHOL: Restoring last activated firewall from ${FIREHOL_SPOOL_DIR}:"
			return 3
		fi
	fi

	if [ -f "${FIREHOL_SPOOL_DIR}/ipv4.enable" -a -f "${FIREHOL_SPOOL_DIR}/ipv4.rules" ]
		then
		${IPTABLES_RESTORE_CMD} <"${FIREHOL_SPOOL_DIR}/ipv4.rules"
		if [ $? -ne 0 ]
			then
			warning "Failed to restore IPv4 rules."
			failure $"FireHOL: Restoring last activated firewall from ${FIREHOL_SPOOL_DIR}:"
			return 3
		fi
	fi

	if [ -f "${FIREHOL_SPOOL_DIR}/ipv6.enable" -a -f "${FIREHOL_SPOOL_DIR}/ipv6.rules" ]
		then
		${IP6TABLES_RESTORE_CMD} <"${FIREHOL_SPOOL_DIR}/ipv6.rules"
		if [ $? -ne 0 ]
			then
			warning "Failed to restore IPv6 rules."
			failure $"FireHOL: Restoring last activated firewall from ${FIREHOL_SPOOL_DIR}:"
			return 3
		fi
	fi

	success $"FireHOL: Saving activated firewall to ${FIREHOL_SPOOL_DIR}:"
	echo
	return 0
}

# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# START UP SCRIPT PROCESSING
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

# ------------------------------------------------------------------------------
# On non RedHat machines we need success() and failure()
success() {
	printf " OK"
}
failure() {
	echo " FAILED"
}

# ------------------------------------------------------------------------------
# A small part bellow is copied from /etc/init.d/iptables

# On RedHat systems this will define success() and failure()
test -f /etc/init.d/functions && . /etc/init.d/functions

kernel_maj_min() {
	local kmaj kmin IFS=.-

	kmaj=$1
	kmin=$2

	set -- $(uname -r)
	eval $kmaj=\$1 $kmin=\$2
}
kernel_maj_min KERNELMAJ KERNELMIN

if [ "$KERNELMAJ" -lt 2 ] ; then
	echo >&2 "FireHOL requires a kernel version higher than 2.3."
	exit 0
fi
if [ "$KERNELMAJ" -eq 2 -a "$KERNELMIN" -lt 3 ] ; then
	echo >&2 "FireHOL requires a kernel version higher than 2.3."
	exit 0
fi

if  ${LSMOD_CMD} 2>/dev/null | ${GREP_CMD} -q ipchains ; then
	# Don't do both
	echo >&2 "ipchains is loaded in the kernel. Please remove ipchains to run iptables."
	exit 0
fi

# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# COMMAND LINE ARGUMENTS PROCESSING
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

arg="${1}"
shift

if [ "${arg}" = "nofast" ]
then
	FIREHOL_FAST_ACTIVATION=0
	arg="${1}"
	shift
fi

case "${arg}" in
	explain)
		test ! -z "${1}" && warning "Arguments after parameter '${arg}' are ignored."
		firewall_policy_applied=1
		firewall_policy6_applied=1
		FIREHOL_FAST_ACTIVATION=0
		FIREHOL_MODE="EXPLAIN"
		;;
	
	helpme|wizard)
		test ! -z "${1}" && warning "Arguments after parameter '${arg}' are ignored."
		FIREHOL_MODE="WIZARD"
		;;
	
	try)
		FIREHOL_MODE="START"
		FIREHOL_TRY=1
		;;
	
	start)
		FIREHOL_MODE="START"
		FIREHOL_TRY=0
		;;
	
	stop)
		FIREHOL_MODE="STOP"
		test ! -z "${1}" && warning "Arguments after parameter '${arg}' are ignored."

		echo -n $"FireHOL: Clearing Firewall:"
		if [ $ENABLE_IPV4 -eq 1 ]; then
			load_kernel_module ip_tables
			tables=`${CAT_CMD} /proc/net/ip_tables_names`
			for t in ${tables}
			do
				${IPTABLES_CMD} -t "${t}" -F
				${IPTABLES_CMD} -t "${t}" -X
				${IPTABLES_CMD} -t "${t}" -Z

				# Find all default chains in this table.
				chains=`${IPTABLES_CMD} -t "${t}" -nL | ${GREP_CMD} "^Chain " | ${CUT_CMD} -d ' ' -f 2`
				for c in ${chains}
				do
					${IPTABLES_CMD} -t "${t}" -P "${c}" ACCEPT
				done
			done
		fi
		if [ $ENABLE_IPV6 -eq 1 ]; then
			load_kernel_module ip6_tables
			tables6=`${CAT_CMD} /proc/net/ip6_tables_names`
			for t in ${tables6}
			do
				${IP6TABLES_CMD} -t "${t}" -F
				${IP6TABLES_CMD} -t "${t}" -X
				${IP6TABLES_CMD} -t "${t}" -Z

				# Find all default chains in this table.
				chains=`${IP6TABLES_CMD} -t "${t}" -nL | ${GREP_CMD} "^Chain " | ${CUT_CMD} -d ' ' -f 2`
				for c in ${chains}
				do
					${IP6TABLES_CMD} -t "${t}" -P "${c}" ACCEPT
				done
			done
		fi
		success $"FireHOL: Clearing Firewall:"
		echo
		
		exit 0
		;;
	
	restore|condrestart)
		FIREHOL_RESTORE_INSTEAD_OF_START=1
		FIREHOL_MODE="START"
		FIREHOL_TRY=0
		;;

	restart|force-reload)
		FIREHOL_MODE="START"
		FIREHOL_TRY=0
		;;
	
	status)
		test ! -z "${1}" && warning "Arguments after parameter '${arg}' are ignored."
		(
		if [ $ENABLE_IPV4 -eq 1 ]; then
			echo
			echo
			echo "--- MANGLE IPv4 ----------------------------------------------------------------"
			echo
			${IPTABLES_CMD} -t mangle -nxvL
		fi

		if [ $ENABLE_IPV6 -eq 1 ]; then
			echo
			echo
			echo "--- MANGLE IPv6 ----------------------------------------------------------------"
			echo
			${IP6TABLES_CMD} -t mangle -nxvL
		fi

		if [ $ENABLE_IPV4 -eq 1 ]; then
			echo
			echo
			echo "--- NAT IPv4 -------------------------------------------------------------------"
			echo
			${IPTABLES_CMD} -t nat -nxvL
		fi

		if [ $ENABLE_IPV6 -eq 1 ]; then
			echo
			echo
			echo "--- NAT IPv6 -------------------------------------------------------------------"
			echo
			if grep -q '^nat$' /proc/net/ip6_tables_names
			then
				${IP6TABLES_CMD} -t nat -nxvL
			else
				echo "IPv6 NAT not available"
			fi
		fi

		if [ $ENABLE_IPV4 -eq 1 ]; then
			echo
			echo
			echo "--- FILTER IPv4 ----------------------------------------------------------------"
			echo
			${IPTABLES_CMD} -nxvL
		fi

		if [ $ENABLE_IPV6 -eq 1 ]; then
			echo
			echo
			echo "--- FILTER IPv6 ----------------------------------------------------------------"
			echo
			${IP6TABLES_CMD} -nxvL
		fi
		) | pager_cmd
		exit $?
		;;
	
	panic)
		FIREHOL_MODE="PANIC"
		ssh_src=
		ssh_sport="0:65535"
		ssh_dport="0:65535"
		if [ ! -z "${SSH_CLIENT}" ]
		then
			set -- ${SSH_CLIENT}
			ssh_src="${1}"
			ssh_sport="${2}"
			ssh_dport="${3}"
		elif [ ! -z "${1}" ]
		then
			ssh_src="${1}"
		fi
		
		syslog info "Starting PANIC mode (SSH SOURCE_IP=${ssh_src} SOURCE_PORTS=${ssh_sport} DESTINATION_PORTS=${ssh_dport})"
		echo -n $"FireHOL: Blocking all communications:"
		if [ $ENABLE_IPV4 -eq 1 ]; then
			load_kernel_module ip_tables
			tables=`${CAT_CMD} /proc/net/ip_tables_names`
			for t in ${tables}
			do
				${IPTABLES_CMD} -t "${t}" -F
				${IPTABLES_CMD} -t "${t}" -X
				${IPTABLES_CMD} -t "${t}" -Z

				# Find all default chains in this table.
				chains=`${IPTABLES_CMD} -t "${t}" -nL | ${GREP_CMD} "^Chain " | ${CUT_CMD} -d ' ' -f 2`
				for c in ${chains}
				do
					${IPTABLES_CMD} -t "${t}" -P "${c}" ACCEPT

					if [ ! -z "${ssh_src}" ]
					then
						${IPTABLES_CMD} -t "${t}" -A "${c}" -p tcp -s "${ssh_src}" --sport "${ssh_sport}" --dport "${ssh_dport}" -m conntrack --ctstate ESTABLISHED -j ACCEPT
						${IPTABLES_CMD} -t "${t}" -A "${c}" -p tcp -d "${ssh_src}" --dport "${ssh_sport}" --sport "${ssh_dport}" -m conntrack --ctstate ESTABLISHED -j ACCEPT
					fi
					if [ "${t}" != "nat" ] ; then
						${IPTABLES_CMD} -t "${t}" -A "${c}" -j DROP
					fi
				done
			done
		fi
		if [ $ENABLE_IPV6 -eq 1 ]; then
			load_kernel_module ip6_tables
			tables6=`${CAT_CMD} /proc/net/ip6_tables_names`
			for t in ${tables6}
			do
				${IP6TABLES_CMD} -t "${t}" -F
				${IP6TABLES_CMD} -t "${t}" -X
				${IP6TABLES_CMD} -t "${t}" -Z

				# Find all default chains in this table.
				chains=`${IP6TABLES_CMD} -t "${t}" -nL | ${GREP_CMD} "^Chain " | ${CUT_CMD} -d ' ' -f 2`
				for c in ${chains}
				do
					${IP6TABLES_CMD} -t "${t}" -P "${c}" ACCEPT

					if [ ! -z "${ssh_src}" ]
					then
						${IP6TABLES_CMD} -t "${t}" -A "${c}" -p tcp -s "${ssh_src}" --sport "${ssh_sport}" --dport "${ssh_dport}" -m conntrack --ctstate ESTABLISHED -j ACCEPT
						${IP6TABLES_CMD} -t "${t}" -A "${c}" -p tcp -d "${ssh_src}" --dport "${ssh_sport}" --sport "${ssh_dport}" -m conntrack --ctstate ESTABLISHED -j ACCEPT
					fi
					if [ "${t}" != "nat" ] ; then
						${IP6TABLES_CMD} -t "${t}" -A "${c}" -j DROP
					fi
				done
			done
		fi
		success $"FireHOL: Blocking all communications:"
		echo
		
		exit 0
		;;
	
	save)
		test ! -z "${1}" && test ${1} != "--" && softwarning "Arguments after parameter '${arg}' are ignored."
		FIREHOL_MODE="START"
		FIREHOL_SAVE=1
		;;
		
	debug)
		test ! -z "${1}" && test ${1} != "--" && softwarning "Arguments after parameter '${arg}' are ignored."
		FIREHOL_MODE="DEBUG"
		;;
	
	*)	if [ ! -z "${arg}" -a -f "${arg}" ]
		then
			FIREHOL_MODE="START"
			FIREHOL_TRY=1
			FIREHOL_CONFIG="${arg}"
			arg="${1}"
			test -z "${arg}" && arg="try"

			case "${arg}" in
				start)
					FIREHOL_TRY=0
					shift
					;;
					
				try)
					FIREHOL_TRY=1
					shift
					;;
					
				debug)
					FIREHOL_MODE="DEBUG"
					FIREHOL_TRY=0
					shift
					;;

				--)
					FIREHOL_TRY=1
					;;

				*)
					echo "Cannot accept command line argument '${1}' here."
					exit 1
					;;
			esac
		else

		emit_version

		${CAT_CMD} <<EOF
FireHOL supports the following command line arguments (only one of them):

	start		to activate the firewall configuration.
			The configuration is expected to be found in
			${FIREHOL_CONFIG_DIR}/firehol.conf
			
	try		to activate the firewall, but wait until
			the user types the word "commit". If this word
			is not typed within 30 seconds, the previous
			firewall is restored.
			
	stop		to stop a running iptables firewall.
			This will allow all traffic to pass unchecked.
		
	restart		this is an alias for start and is given for
			compatibility with /etc/init.d/iptables.
			
	status		will show the running firewall, as in:
				${IPTABLES_CMD} -nxvL
			and
				${IP6TABLES_CMD} -nxvL
			
	panic		will block all IP communication.
	
	restore		will restore the last activated firewall.
			Useful for quickly restoring at boot the last
			successfully activated FireHOL firewall.

	save		to start the firewall and then save it to the
			place where /etc/init.d/iptables looks for it.
			
			Note that not all firewalls will work if
			restored with:
			/etc/init.d/iptables start
			
			The fastest way to restore a FireHOL firewall
			at boot is the 'restore' feature.

	debug		to parse the configuration file but instead of
			activating it, to show the generated iptables
			statements.
	
	explain		to enter interactive mode and accept configuration
			directives. It also gives the iptables commands
			for each directive together with reasoning.
			
	helpme	or	to enter a wizard mode where FireHOL will try
	wizard		to figure out the configuration you need.
			You can redirect the standard output of FireHOL to
			a file to get the config to this file.
			
	<a filename>	a different configuration file.
			If not other argument is given, the configuration
			will be "tried" (default = try).
			Otherwise the argument next to the filename can
			be one of 'start', 'debug' and 'try'.


-------------------------------------------------------------------------

FireHOL supports the following services (sorted by name):
EOF


		(
			# The simple services
			${CAT_CMD} "${FIREHOL_FILE}"				|\
				${GREP_CMD} -e "^server_.*_ports="	|\
				${CUT_CMD} -d '=' -f 1			|\
				${SED_CMD} "s/^server_//"		|\
				${SED_CMD} "s/_ports\$//"
			
			# The complex services
			${CAT_CMD} "${FIREHOL_FILE}"				|\
				${GREP_CMD} -e "^rules_.*()"		|\
				${CUT_CMD} -d '(' -f 1			|\
				${SED_CMD} "s/^rules_/(*) /"
		) | ${SORT_CMD} | ${UNIQ_CMD} |\
		(
			x=0
			while read
			do
				x=$[x + 1]
				if [ $x -gt 4 ]
				then
					printf "\n"
					x=1
				fi
				printf "% 16s |" "$REPLY"
			done
			printf "\n\n"
		)
		
		${CAT_CMD} <<EOF

Services marked with (*) are "smart" or complex services.
All the others are simple single socket services.

Please note that the service:
	
	all	matches all packets and all protocols, while ensuring that
		required kernel modules are loaded. Packets "untracked" by
		iptables (e.g. ICMPv6 neighbour discovery packets) are not
		included in "all" and must be handled separately.
	
	any	allows the matching of packets with unusual rules, like
		only protocol but no ports. If service any is used
		without other parameters, it does what service all does
		but it does not handle kernel modules.
		For example, to match GRE traffic use:
		
		server any mygre accept proto 47
		
		Service any does not handle kernel modules.
		
	custom	allows the definition of a custom service.
		The template is:
		
		server custom name protocol/sport cport accept
		
		where name is just a name, protocol is the protocol the
		service uses (tcp, udp, etc), sport is server port,
		cport is the client port. For example, IMAP4 is:
		
		server custom imap tcp/143 default accept

YOU DO NOT KNOW WHAT TO DO? FireHOL can help you! Just run it with the
argument 'helpme' and it will generate its configuration file for this
machine. Your running firewall will not be altered or stopped, and no
systems settings will be modified. Just run:

${FIREHOL_FILE} helpme >/tmp/firehol.conf

and you will get the configuration written to /tmp/firehol.conf

EOF
		exit 1
		
		fi
		;;
esac

# Remove all parameters until --
while [ ! -z "${1}" ]
do
	if [ "${1}" = "--" ]
	then
		shift
		break
	fi

	warning "Parameter '${1}' is ignored."
	shift
done

if [ "${FIREHOL_MODE}" = "START" -o "${FIREHOL_MODE}" = "DEBUG" ]
then
	if [ ! -f "${FIREHOL_CONFIG}" ]
	then
		echo -n $"FireHOL config ${FIREHOL_CONFIG} not found:"
		failure $"FireHOL config ${FIREHOL_CONFIG} not found:"
		echo
		exit 1
	fi
fi


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# MAIN PROCESSING - Interactive mode
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

if [ "${FIREHOL_MODE}" = "EXPLAIN" ]
then
	FIREHOL_CONFIG="Interactive User Input"
	FIREHOL_LINEID="1"

	FIREHOL_TEMP_CONFIG="${FIREHOL_DIR}/firehol.conf"

	echo "version ${FIREHOL_VERSION}" >"${FIREHOL_TEMP_CONFIG}"
	version ${FIREHOL_VERSION}

	emit_version

	${CAT_CMD} <<EOF
You can now start typing firehol configuration directives.
Special interactive commands: help, show, quit

EOF
	
	while [ 1 = 1 ]
	do
		read -p "# FireHOL [${work_cmd}:${work_name}] > " -e -r
		test -z "${REPLY}" && continue
		
		set_work_function -ne "Executing user input"
		
		while [ 1 = 1 ]
		do
		
		set -- ${REPLY}
		
		case "${1}" in
			help)
				${CAT_CMD} <<EOF
You can use anything a FireHOL configuration file accepts, including variables,
loops, etc. Take only care to write loops in one row.

Additionaly, you can use the following commands:
	
	help	to print this text on your screen.
	
	show	to show all the successfull commands so far.
	
	quit	to show the interactively given configuration file
		and quit.
	
	in	same as typing: interface eth0 internet
		This is used as a shortcut to get into the server/client
		mode in which you can test the rules for certain
		services.

EOF
				break
				;;
				
			show)
				echo
				${CAT_CMD} "${FIREHOL_TEMP_CONFIG}"
				echo
				break
				;;
				
			quit)
				echo
				${CAT_CMD} "${FIREHOL_TEMP_CONFIG}"
				echo
				exit 1
				;;
				
			in)
				REPLY="interface eth0 internet"
				continue
				;;
				
			*)
				${CAT_CMD} <<EOF

# \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
# Cmd Line : ${FIREHOL_LINEID}
# Command  : ${REPLY}
EOF
				eval "$@"
				if [ $? -gt 0 ]
				then
					printf "\n# > FAILED <\n"
				else
					if [ "${1}" = "interface" -o "${1}" = "router" ]
					then
						echo >>"${FIREHOL_TEMP_CONFIG}"
					else
						printf "	" >>"${FIREHOL_TEMP_CONFIG}"
					fi
					
					printf "%s\n" "${REPLY}" >>"${FIREHOL_TEMP_CONFIG}"
					
					FIREHOL_LINEID=$[FIREHOL_LINEID + 1]
					
					printf "\n# > OK <\n"
				fi
				break
				;;
		esac
		
		break
		done
	done
	
	exit 0
fi


# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# MAIN PROCESSING - help wizard
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

if [ "${FIREHOL_MODE}" = "WIZARD" ]
then
	# require commands for wizard mode
	require_cmd ip
	require_cmd ss
	require_cmd date
	require_cmd hostname
	
	wizard_ask() {
		local prompt="${1}"; shift
		local def="${1}"; shift

		echo >&2

		while [ 1 = 1 ]
		do
			printf >&2 "%s [%s] > " "${prompt}" "${def}"
			read
			
			local ans="${REPLY}"
			
			test -z "${ans}" && ans="${def}"
			
			local c=0
			while [ $c -le $# ]
			do
				eval local t="\${${c}}"
				
				test "${ans}" = "${t}" && break
				c=$[c + 1]
			done
			
			test $c -le $# && return $c
			
			printf >&2 "*** '${ans}' is not a valid answer. Pick one of "
			printf >&2 "%s " "$@"
			echo >&2 
			echo >&2 
		done
		
		return 0
	}
	
	ip_in_net() {
		local ip="${1}"; shift
		local net="${1}"; shift
		
		if [ -z "${ip}" -o -z "${net}" ]
		then
			return 1
		fi
		
		test "${net}" = "default" && net="0.0.0.0/0"
		
		set -- `echo ${ip} | ${TR_CMD} './' '  '`
		local i1=${1}
		local i2=${2}
		local i3=${3}
		local i4=${4}
		
		set -- `echo ${net} | ${TR_CMD} './' '  '`
		local n1=${1}
		local n2=${2}
		local n3=${3}
		local n4=${4}
		local n5=${5:-32}
		
		local i=$[i1*256*256*256 + i2*256*256 + i3*256 + i4]
		local n=$[n1*256*256*256 + n2*256*256 + n3*256 + n4]
		
#		echo "IP : '${i1}' . '${i2}' . '${i3}' . '${i4}'"
#		echo "NET: '${n1}' . '${n2}' . '${n3}' . '${n4}' / '${n5}'"
		
		local d=1
		local c=${n5}
		while [ $c -lt 32 ]
		do
			c=$[c + 1]
			d=$[d * 2]
		done
		
		local nm=$[n + d - 1]
		
		printf "# INFO: Is ${ip} part of network ${net}? "
		
		if [ ${i} -ge ${n} -a ${i} -le ${nm} ]
		then
			echo "yes"
			return 0
		else
			echo "no"
			return 1
		fi
	}
	
	ip_is_net() {
		local ip="${1}"; shift
		local net="${1}"; shift
		
		if [ -z "${ip}" -o -z "${net}" ]
		then
			return 1
		fi
		
		test "${net}" = "default" && net="0.0.0.0/0"
		
		set -- `echo ${ip} | ${TR_CMD} './' '  '`
		local i1=${1}
		local i2=${2}
		local i3=${3}
		local i4=${4}
		local i5=${5:-32}
		
		set -- `echo ${net} | ${TR_CMD} './' '  '`
		local n1=${1}
		local n2=${2}
		local n3=${3}
		local n4=${4}
		local n5=${5:-32}
		
		local i=$[i1*256*256*256 + i2*256*256 + i3*256 + i4]
		local n=$[n1*256*256*256 + n2*256*256 + n3*256 + n4]
		
		if [ ${i} -eq ${n} -a ${i5} -eq ${n5} ]
		then
			return 0
		else
			return 1
		fi
	}
	
	ip2net() {
		local ip="${1}"; shift
		
		if [ -z "${ip}" ]
		then
			return 0
		fi
		
		if [ "${ip}" = "default" ]
		then
			echo "default"
			return 0
		fi
		
		set -- `echo ${ip} | ${TR_CMD} './' '  '`
		local i1=${1}
		local i2=${2}
		local i3=${3}
		local i4=${4}
		local i5=${5:-32}
		
		if [ "${i5}" = "32" ]
		then
			echo ${i1}.${i2}.${i3}.${i4}
		else
			echo ${i1}.${i2}.${i3}.${i4}/${i5}
		fi
	}
	
	ips2net() {
		
		(
			if [ "A${1}" = "A-" ]
			then
				while read ip
				do
					ip2net ${ip}
				done
			else
				while [ ! -z "${1}" ]
				do
					ip2net ${1}
					shift 
				done
			fi
		) | ${SORT_CMD} | ${UNIQ_CMD} | ${TR_CMD} "\n" " "
	}
	
	cd "${FIREHOL_DIR}"
	"${MKDIR_CMD}" ports
	"${MKDIR_CMD}" keys
	cd ports
	"${MKDIR_CMD}" tcp
	"${MKDIR_CMD}" udp

	emit_version >&2

	"${CAT_CMD}" >&2 <<EOF
FireHOL will now try to figure out its configuration file on this system.
Please have all the services and network interfaces on this system running.

Your running firewall will not be stopped or altered.

You can re-run the same command with output redirection to get the config
to a file. Example:

EOF
	echo >&2 "${FIREHOL_FILE} helpme >/tmp/firehol.conf"
	echo >&2 
	echo >&2 
		
	echo >&2 
	echo >&2 "Building list of known services."
	echo >&2 "Please wait..."
	
	${CAT_CMD} /etc/services	|\
		${TR_CMD} '\t' ' '	|\
		${SED_CMD} "s/ \+/ /g"	>services
	
	for c in `echo ${!server_*} | ${TR_CMD} ' ' '\n' | ${GREP_CMD} "_ports$"`
	do
		serv=`echo $c | ${SED_CMD} "s/server_//" | ${SED_CMD} "s/_ports//"`
		
		eval "ret=\${$c}"
		for x in ${ret}
		do
			proto=`echo $x | ${CUT_CMD} -d '/' -f 1`
			port=`echo $x | ${CUT_CMD} -d '/' -f 2`
			
			test ! -d "${proto}" && continue
			
			nport=`${EGREP_CMD} "^${port}[[:space:]][0-9]+/${proto}" services | ${CUT_CMD} -d ' ' -f 2 | ${CUT_CMD} -d '/' -f 1`
			test -z "${nport}" && nport="${port}"
			
			echo "server ${serv}" >"${proto}/${nport}"
		done
	done
	
	echo "server ftp" >tcp/21
	echo "server nfs" >udp/2049
	
	echo "client amanda" >udp/10080
	
	echo "server dhcp" >udp/67
	echo "server dhcp" >tcp/67
	
	echo "client dhcp" >udp/68
	echo "client dhcp" >tcp/68
	
	echo "server emule" >tcp/4662
	
	echo "server pptp" >tcp/1723
	
	echo "server samba" >udp/137
	echo "server samba" >udp/138
	echo "server samba" >tcp/139
	
	
	wizard_ask "Press RETURN to start." "continue" "continue"
	
	echo >&2 
	echo >&2 "--- snip --- snip --- snip --- snip ---"
	echo >&2 
	
	${CAT_CMD} <<EOF
#
# FireHOL configuration (autogenerated)
#
# This config will have the same effect as NO PROTECTION!
# Everything that found to be running, is allowed.
# YOU SHOULD NEVER USE THIS CONFIG AS-IS.
# 
# Date: `${DATE_CMD}` on host `${HOSTNAME_CMD}`
# 
# IMPORTANT:
# The TODOs bellow, are *YOUR* to-dos!
#

EOF
	
	# globals for routing
	set -a found_interfaces=
	set -a found_ips=
	set -a found_nets=
	set -a found_excludes=
	
	helpme_iface() {
		local route="${1}"; shift
		local i="${1}"; shift
		local iface="${1}"; shift
		local ifip="${1}"; shift
		local ifnets="${1}"; shift
		local ifreason="${1}"; shift
		
		# one argument left: ifnets_excluded
		
		if [ "${route}" = "route" ]
		then
			found_interfaces[$i]="${iface}"
			found_ips[$i]="${ifip}"
			found_nets[$i]="${ifnets}"
			found_excludes[$i]="${1}"
		fi
		
		if [ "${ifnets}" = "default" ]
		then
			ifnets="not \"\${UNROUTABLE_IPS} ${1}\""
		else
			ifnets="\"${ifnets}\""
		fi
		
		# output the interface
		echo
		echo "# Interface No $i."
		echo "# The purpose of this interface is to control the traffic"
		if [ ! -z "${ifreason}" ]
		then
			echo "# ${ifreason}."
		else
			echo "# on the ${iface} interface with IP ${ifip} (net: ${ifnets})."
		fi
		
		echo "# TODO: Change \"if${i}\" to something with meaning to you."
		echo "# TODO: Check the optional rule parameters (src/dst)."
		echo "#       Remove 'dst ${ifip}' if this is dynamically assigned."
		echo "#       To add IPv6, read http://firehol.org/upgrade/#config-version-6"
		echo "interface4 ${iface} if${i} src ${ifnets} dst ${ifip}"
		echo
		echo "	# The default policy is DROP. You can be more polite with REJECT."
		echo "	# Prefer to be polite on your own clients to prevent timeouts."
		echo "	policy drop"
		echo
		echo "	# If you don't trust the clients behind ${iface} (net ${ifnets}),"
		echo "	# add something like this."
		echo "	# > protection strong"
		echo
		echo "	# Here are the services listening on ${iface}."
		echo "	# TODO: Normally, you will have to remove those not needed."
		
		(
			local x=
			local ports=
			for x in `${SS_CMD} -tln | ${SED_CMD} "s|:::|\*:|g" | ${SED_CMD} "s|::ffff:||g" | ${EGREP_CMD} " (${ifip}|\*):[0-9]+" | ${CUT_CMD} -d ':' -f 2 | ${CUT_CMD} -d ' ' -f 1 | ${SORT_CMD} -n | ${UNIQ_CMD}`
			do
				if [ -f "tcp/${x}" ]
				then
					echo "	`${CAT_CMD} tcp/${x}` accept"
				else
					ports="${ports} tcp/${x}"
				fi
			done
			
			for x in `${SS_CMD} -uln | ${SED_CMD} "s|:::|\*:|g" | ${SED_CMD} "s|::ffff:||g" | ${EGREP_CMD} " (${ifip}|\*):[0-9]+" | ${CUT_CMD} -d ':' -f 2 | ${CUT_CMD} -d ' ' -f 1 | ${SORT_CMD} -n | ${UNIQ_CMD}`
			do
				if [ -f "udp/${x}" ]
				then
					echo "	`${CAT_CMD} udp/${x}` accept"
				else
					ports="${ports} udp/${x}"
				fi
			done
			
			echo "	server ICMP accept"
			
			echo "${ports}" | ${TR_CMD} " " "\n" | ${SORT_CMD} -n | ${UNIQ_CMD} | ${TR_CMD} "\n" " " >unknown.ports
		) | ${SORT_CMD} | ${UNIQ_CMD}
		
		echo
		echo "	# The following ${iface} services are not known by FireHOL:"
		${CAT_CMD} unknown.ports | ${FOLD_CMD} -s -w 65 | ${SED_CMD} "s|^ *|\t# |"
		echo
		
		echo
		echo "	# Custom service definitions for the above unknown services."
		local ts=
		local tscount=0
		for ts in `${CAT_CMD} unknown.ports`
		do
			local tscount=$[tscount + 1]
			echo "	server custom if${i}_${tscount} ${ts} any accept"
		done
		
		echo
		echo "	# The following means that this machine can REQUEST anything via ${iface}."
		echo "	# TODO: On production servers, avoid this and allow only the"
		echo "	#       client services you really need."
		echo "	client all accept"
		echo
	}
	
	interfaces=`${IP_CMD} link show | ${EGREP_CMD} "^[0-9A-Za-z]+:" | ${CUT_CMD} -d ':' -f 2 | ${SED_CMD} "s/^ //" | ${SED_CMD} "s/@[a-z0-9]*//" | ${GREP_CMD} -v "^lo$" | ${SORT_CMD} | ${UNIQ_CMD} | ${TR_CMD} "\n" " "`
	gw_if=`${IP_CMD} route show | ${GREP_CMD} "^default" | ${SED_CMD} "s/dev /dev:/g" | ${TR_CMD} " " "\n" | ${GREP_CMD} "^dev:" | ${CUT_CMD} -d ':' -f 2`
	gw_ip=`${IP_CMD} route show | ${GREP_CMD} "^default" | ${SED_CMD} "s/via /via:/g" | ${TR_CMD} " " "\n" | ${GREP_CMD} "^via:" | ${CUT_CMD} -d ':' -f 2 | ips2net -`
	
	i=0
	for iface in ${interfaces}
	do
		echo "# INFO: Processing interface '${iface}'"
		ips=`${IP_CMD} addr show dev ${iface} | ${SED_CMD} "s/ \+/ /g" | ${GREP_CMD} "^ inet " | ${CUT_CMD} -d ' ' -f 3 | ${CUT_CMD} -d '/' -f 1 | ips2net -`
		peer=`${IP_CMD} addr show dev ${iface} | ${SED_CMD} "s/ \+/ /g" | ${SED_CMD} "s/peer /peer:/g" | ${TR_CMD} " " "\n" | ${GREP_CMD} "^peer:" | ${CUT_CMD} -d ':' -f 2 | ips2net -`
		nets=`${IP_CMD} route show dev ${iface} | ${CUT_CMD} -d ' ' -f 1 | ips2net -`
		
		if [ -z "${ips}" -o -z "${nets}" ]
		then
			echo
			echo "# IMPORTANT: "
			echo "# Ignoring interface '${iface}' because does not have an IP or route."
			echo
			continue
		fi
		
		for ip in ${ips}
		do
			echo "# INFO: Processing IP ${ip} of interface '${iface}'"
			
			ifreason=""
			
			# find all the networks this IP can access directly
			# or through its peer
			netcount=0
			ifnets=
			ofnets=
			for net in ${nets}
			do
				test "${net}" = "default" && continue
				
				found=1
				ip_in_net ${ip} ${net}
				found=$?
				
				if [ ${found} -gt 0 -a ! -z "${peer}" ]
				then
					ip_in_net ${peer} ${net}
					found=$?
				fi
				
				if [ ${found} -eq 0 ]
				then
					# Add it to ifnets
					f=0; ff=0
					while [ $f -lt $netcount ]
					do
						if ip_in_net ${net} ${ifnets[$f]}
						then
							# Already satisfied
							ff=1
						elif ip_in_net ${ifnets[$f]} ${net}
						then
							# New one is superset of old
							ff=1
							ifnets[$f]=${net}
						fi
						
						f=$[f + 1]
					done
					
					if [ $ff -eq 0 ]
					then
						# Add it
						netcount=$[netcount + 1]
						ifnets=(${net} "${ifnets[@]}")
					fi
				else
					ofnets=(${net} "${ofnets[@]}")
				fi
			done
			
			# find all the networks this IP can access through gateways
			if [ ! -z "${ofnets[*]}" ]
			then
				for net in "${ofnets[@]}"
				do
					test "${net}" = "default" && continue
					
					nn=`echo "${net}" | ${CUT_CMD} -d "/" -f 1`
					gw=`${IP_CMD} route show ${nn} dev ${iface} | ${EGREP_CMD} "^${nn}[[:space:]]+via[[:space:]][0-9\.]+" | ${CUT_CMD} -d ' ' -f 3 | ips2net -`
					test -z "${gw}" && continue
					
					for nn in "${ifnets[@]}"
					do
						test "${nn}" = "default" && continue
						
						if ip_in_net ${gw} ${nn}
						then
							echo "# INFO: Route ${net} is accessed through ${gw}"
							
							# Add it to ifnets
							f=0; ff=0
							while [ $f -lt $netcount ]
							do
								if ip_in_net ${net} ${ifnets[$f]}
								then
									# Already satisfied
									ff=1
								elif ip_in_net ${ifnets[$f]} ${net}
								then
									# New one is superset of old
									ff=1
									ifnets[$f]=${net}
								fi
								
								f=$[f + 1]
							done
							
							if [ $ff -eq 0 ]
							then
								# Add it
								netcount=$[netcount + 1]
								ifnets=(${net} "${ifnets[@]}")
							fi
							break
						fi
					done
				done
			fi
			
			# Don't produce an interface if this is just a peer that is also the default gw
			def_ignore_ifnets=0
			if (test ${netcount} -eq 1 -a "${gw_if}" = "${iface}" && ip_is_net "${peer}" "${ifnets[*]}" && ip_is_net "${gw_ip}" "${peer}")
			then
				echo "# INFO: Skipping ${iface} peer ${ifnets[*]} only interface (default gateway)."
				echo
				def_ignore_ifnets=1
			else
				i=$[i + 1]
				helpme_iface route $i "${iface}" "${ip}" "${ifnets[*]}" "${ifreason}"
			fi
			
			# Is this interface the default gateway too?
			if [ "${gw_if}" = "${iface}" ]
			then
				for nn in "${ifnets[@]}"
				do
					if ip_in_net "${gw_ip}" ${nn}
					then
						echo "# INFO: Default gateway ${gw_ip} is part of network ${nn}"
						
						i=$[i + 1]
						helpme_iface route $i "${iface}" "${ip}" "default" "from/to unknown networks behind the default gateway ${gw_ip}" "`test ${def_ignore_ifnets} -eq 0 && echo "${ifnets[*]}"`"
						
						break
					fi
				done
			fi
		done
	done
	
	echo
	echo "# The above $i interfaces were found active at this moment."
	echo "# Add more interfaces that can potentially be activated in the future."
	echo "# FireHOL will not complain if you setup a firewall on an interface that is"
	echo "# not active when you activate the firewall."
	echo "# If you don't setup an interface, FireHOL will drop all traffic from or to"
	echo "# this interface, if and when it becomes available."
	echo "# Also, if an interface name dynamically changes (i.e. ppp0 may become ppp1)"
	echo "# you can use the plus (+) character to match all of them (i.e. ppp+)."
	echo
	
	if [ "1" = "`${CAT_CMD} /proc/sys/net/ipv4/ip_forward`" ]
	then
		x=0
		i=0
		while [ $i -lt ${#found_interfaces[*]} ]
		do
			i=$[i + 1]
			
			inface="${found_interfaces[$i]}"
			src="${found_nets[$i]}"
			
			case "${src}" in
				"default")
					src="not \"\${UNROUTABLE_IPS} ${found_excludes[$i]}\""
					;;
					
					*)
					src="\"${src}\""
					;;
			esac
			
			j=0
			while [ $j -lt ${#found_interfaces[*]} ]
			do
				j=$[j + 1]
				
				test $j -eq $i && continue
				
				outface="${found_interfaces[$j]}"
				dst="${found_nets[$j]}"
				dst_ip="${found_ips[$j]}"
				
				case "${dst}" in
					"default")
						dst="not \"\${UNROUTABLE_IPS} ${found_excludes[$j]}\""
						;;
						
						*)
						dst="\"${dst}\""
						;;
				esac
				
				# Make sure we are not routing to the same subnet
				test "${inface}" = "${outface}" -a "${src}" = "${dst}" && continue
				
				# Make sure this is not a duplicate router
				key="`echo ${inface}/${src}-${outface}/${dst} | ${TR_CMD} "/ \\\$\\\"{}" "______"`"
				test -f "${FIREHOL_DIR}/keys/${key}" && continue
				${TOUCH_CMD} "${FIREHOL_DIR}/keys/${key}"
				
				x=$[x + 1]
				if [ $x -lt 10 ]
				then
					lx="0$x"
				else
					lx="$x"
				fi
				
				echo
				echo "# Router No ${x}."
				echo "# Clients on ${inface} (from ${src}) accessing servers on ${outface} (to ${dst})."
				echo "# TODO: Change \"router${lx}\" to something with meaning to you."
				echo "# TODO: Check the optional rule parameters (src/dst)."
				echo "#       To add IPv6, read http://firehol.org/upgrade/#config-version-6"
				echo "router4 router${lx} inface ${inface} outface ${outface} src ${src} dst ${dst}"
				echo 
				echo "	# If you don't trust the clients on ${inface} (from ${src}), or"
				echo "	# if you want to protect the servers on ${outface} (to ${dst}),"
				echo "	# uncomment the following line."
				echo "	# > protection strong"
				echo
				echo "	# To NAT client requests on the output of ${outface}, add this."
				echo "	# > masquerade"
				
				echo "	# Alternatively, you can SNAT them by placing this at the top of this config:"
				echo "	# > snat to ${dst_ip} outface ${outface} src ${src} dst ${dst}"
				echo "	# SNAT commands can be enhanced using 'proto', 'sport', 'dport', etc in order to"
				echo "	# NAT only some specific traffic."
				echo
				echo "	# TODO: This will allow all traffic to pass."
				echo "	# If you remove it, no REQUEST will pass matching this traffic."
				echo "	route all accept"
				echo
			done
		done
		
		if [ ${x} -eq 0 ]
		then
			echo
			echo
			echo "# No router statements have been produced, because your server"
			echo "# does not seem to need any."
			echo
		fi
	else
		echo
		echo
		echo "# No router statements have been produced, because your server"
		echo "# is not configured for forwarding traffic."
		echo
	fi
	
	exit 0
fi

# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------
#
# MAIN PROCESSING
#
# ------------------------------------------------------------------------------
# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# ------------------------------------------------------------------------------

# make sure we are alone
firehol_concurrent_run_lock


# --- Initialization -----------------------------------------------------------

echo -n $"FireHOL: Saving your running firewall to a temporary file:"
if [ $ENABLE_IPV4 -eq 1 ]
then
	fixed_save ${IPTABLES_SAVE_CMD} >${FIREHOL_SAVED}.new
	status4=$?
else
	status4=0
fi

if [ $ENABLE_IPV6 -eq 1 ]
then
	fixed_save ${IP6TABLES_SAVE_CMD} >${FIREHOL_SAVED6}.new
	status6=$?
else
	status6=0
fi

if [ $status4 -eq 0 -a $status6 -eq 0 ]
then
	test -f ${FIREHOL_SAVED}.new && mv ${FIREHOL_SAVED}.new ${FIREHOL_SAVED}
	test -f ${FIREHOL_SAVED6}.new && mv ${FIREHOL_SAVED6}.new ${FIREHOL_SAVED6}

	success $"FireHOL: Saving your running firewall to a temporary file:"
	echo
else
	${RM_CMD} -f "${FIREHOL_SAVED}" "${FIREHOL_SAVED6}"
	failure $"FireHOL: Saving your running firewall to a temporary file:"
	echo
	exit 1
fi

declare -a FIREHOL_ARGS=("${FIREHOL_CONFIG}" "${FIREHOL_CONFIG_DIR}" "${FIREHOL_SERVICES_DIR}" "${@}")
if [ "${FIREHOL_MODE}" = "START" -a ${FIREHOL_RESTORE_INSTEAD_OF_START} -eq 1 ]
then
	firehol_restore_last_activated_firewall
	if [ $? -eq 0 ]
	then
		${RM_CMD} -f "${FIREHOL_SAVED}" "${FIREHOL_SAVED6}" >/dev/null 2>&1
		FIREHOL_ACTIVATED_SUCCESSFULLY=1
		exit 0
	fi
	warning "Starting the firewall normally..."
fi


# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

# clear all chains
firehol_filter_chains=
firehol_filter6_chains=
initialize_firewall() {
	load_kernel_module ip_tables
	load_kernel_module nf_conntrack
	if [ $ENABLE_IPV6 -eq 1 ]
	then
		load_kernel_module ip6_tables
	fi
	
	for m in ${FIREHOL_KERNEL_MODULES}
	do
		postprocess -ne -ns load_kernel_module $m
	done
	
	test $FIREHOL_ROUTING -eq 1 && postprocess -warn ${SYSCTL_CMD} -w "net.ipv4.ip_forward=1"
	
	for m in "${!FIREHOL_NFACCT[@]}"
	do
		# -ne here because nfacct will generate an error
		# if the object already exists.
		postprocess -ne "${NFACCT_CMD}" add "${m}"
	done

	# Find all tables supported
	local t=
	if [ $ENABLE_IPV4 -eq 1 ]; then
		local tables=`${CAT_CMD} /proc/net/ip_tables_names`
		for t in ${tables}
		do
			# Reset/empty this table.
			${IPTABLES_CMD} -t "${t}" -F || exit 1
			${IPTABLES_CMD} -t "${t}" -X || exit 1
			${IPTABLES_CMD} -t "${t}" -Z || exit 1
		
			# Find all default chains in this table.
			local chains=`${IPTABLES_CMD} -t "${t}" -nL | ${GREP_CMD} "^Chain " | ${CUT_CMD} -d ' ' -f 2`
		
			# If this is the 'filter' table, remember the default chains.
			# This will be used at the end to make it DROP all packets.
			test "${t}" = "filter" && firehol_filter_chains="${chains}"
		
			# Set the policy to ACCEPT on all default chains.
			local c=
			for c in ${chains}
			do
				local policy=ACCEPT
				if [ "${t}" = "filter" ]
				then
					eval "policy=\${FIREHOL_${c}_ACTIVATION_POLICY}"
				fi
				${IPTABLES_CMD} -t "${t}" -P "${c}" $policy || exit 1
			done
		done

		# Allow existing traffic to continue:
		#   insert as the first rule in each chain, making it easy to
		#   undo once the firewall is completely established
		if [ ${FIREHOL_FAST_ACTIVATION} -ne 1 -a \
			"${FIREHOL_ESTABLISHED_ACTIVATION_ACCEPT}" = "1" ]
		then
			${IPTABLES_CMD} -I INPUT 1 \
				-m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
			${IPTABLES_CMD} -I OUTPUT 1 \
				-m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
			${IPTABLES_CMD} -I FORWARD 1 \
				-m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
		fi
	fi

	if [ $ENABLE_IPV6 -eq 1 ]; then
		local tables6=`${CAT_CMD} /proc/net/ip6_tables_names`
		for t in ${tables6}
		do
			# Reset/empty this table.
			${IP6TABLES_CMD} -t "${t}" -F || exit 1
			${IP6TABLES_CMD} -t "${t}" -X || exit 1
			${IP6TABLES_CMD} -t "${t}" -Z || exit 1

			# Find all default chains in this table.
			local chains=`${IP6TABLES_CMD} -t "${t}" -nL | ${GREP_CMD} "^Chain " | ${CUT_CMD} -d ' ' -f 2`

			# If this is the 'filter' table, remember the default chains.
			# This will be used at the end to make it DROP all packets.
			test "${t}" = "filter" && firehol_filter6_chains="${chains}"

			# Set the policy to ACCEPT on all default chains.
			local c=
			for c in ${chains}
			do
				local policy=ACCEPT
				if [ "${t}" = "filter" ]
				then
					eval "policy=\${FIREHOL_${c}_ACTIVATION_POLICY}"
				fi
				${IP6TABLES_CMD} -t "${t}" -P "${c}" $policy || exit 1
			done
		done

		# Allow existing traffic to continue
		if [ ${FIREHOL_FAST_ACTIVATION} -ne 1 -a \
			"${FIREHOL_ESTABLISHED_ACTIVATION_ACCEPT}" = "1" ]
		then
			${IP6TABLES_CMD} -I INPUT 1 \
				-m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
			${IP6TABLES_CMD} -I OUTPUT 1 \
				-m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
			${IP6TABLES_CMD} -I FORWARD 1 \
				-m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
		fi
	fi
}

# drop everything
finalize_firewall() {
	# Make it drop everything on table 'filter'.
	local c=
	if [ $ENABLE_IPV4 -eq 1 ]; then
		for c in ${firehol_filter_chains}
		do
			${IPTABLES_CMD} -t filter -P "${c}" DROP || exit 1
		done

		# Remove rules inserted which were to keep existing traffic
		# alive during activation
		if [ ${FIREHOL_FAST_ACTIVATION} -ne 1 -a \
			"${FIREHOL_ESTABLISHED_ACTIVATION_ACCEPT}" = "1" ]
		then
			${IPTABLES_CMD} -D INPUT \
				-m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
			${IPTABLES_CMD} -D OUTPUT \
				-m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
			${IPTABLES_CMD} -D FORWARD \
				-m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
		fi
	fi

	if [ $ENABLE_IPV6 -eq 1 ]; then
		for c in ${firehol_filter6_chains}
		do
			${IP6TABLES_CMD} -t filter -P "${c}" DROP || exit 1
		done

		if [ ${FIREHOL_FAST_ACTIVATION} -ne 1 -a \
			"${FIREHOL_ESTABLISHED_ACTIVATION_ACCEPT}" = "1" ]
		then
			${IP6TABLES_CMD} -D INPUT \
				-m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
			${IP6TABLES_CMD} -D OUTPUT \
				-m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
			${IP6TABLES_CMD} -D FORWARD \
				-m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
		fi
	fi
}

# this will be run when the first iptables command get executed in pre-process mode.
# so that its commands are prepended to the other iptables commands of the firewall
firewall_policy_applied=0
firewall_policy() {
	firewall_policy_applied=1
	
	iptables -t filter -P INPUT "${FIREHOL_INPUT_ACTIVATION_POLICY}"
	iptables -t filter -P OUTPUT "${FIREHOL_OUTPUT_ACTIVATION_POLICY}"
	iptables -t filter -P FORWARD "${FIREHOL_FORWARD_ACTIVATION_POLICY}"

	# Accept everything in/out the loopback device.
	if [ "${FIREHOL_TRUST_LOOPBACK}" = "1" ]
	then
		iptables -A INPUT -i lo -j ACCEPT
		iptables -A OUTPUT -o lo -j ACCEPT
	fi

	# Drop all invalid packets.
	# Netfilter HOWTO suggests to DROP all INVALID packets.
	if [ "${FIREHOL_DROP_INVALID}" = "1" ]
	then
		iptables -A INPUT -m conntrack --ctstate INVALID -j DROP
		iptables -A OUTPUT -m conntrack --ctstate INVALID -j DROP
		iptables -A FORWARD -m conntrack --ctstate INVALID -j DROP
	fi
}

firewall_policy6_applied=0
firewall_policy6() {
	firewall_policy6_applied=1
	
	ip6tables -t filter -P INPUT "${FIREHOL_INPUT_ACTIVATION_POLICY}"
	ip6tables -t filter -P OUTPUT "${FIREHOL_OUTPUT_ACTIVATION_POLICY}"
	ip6tables -t filter -P FORWARD "${FIREHOL_FORWARD_ACTIVATION_POLICY}"

	# Accept everything in/out the loopback device.
	if [ "${FIREHOL_TRUST_LOOPBACK}" = "1" ]
	then
		ip6tables -A INPUT -i lo -j ACCEPT
		ip6tables -A OUTPUT -o lo -j ACCEPT
	fi

	# Drop all invalid packets.
	# Netfilter HOWTO suggests to DROP all INVALID packets.
	if [ "${FIREHOL_DROP_INVALID}" = "1" ]
	then
		ip6tables -A INPUT -m conntrack --ctstate INVALID -j DROP
		ip6tables -A OUTPUT -m conntrack --ctstate INVALID -j DROP
		ip6tables -A FORWARD -m conntrack --ctstate INVALID -j DROP
	fi
}


# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

echo -n $"FireHOL: Processing file ${FIREHOL_CONFIG}:"
ret=0

# ------------------------------------------------------------------------------
# Create a small awk script that inserts line numbers in the configuration file
# just before each known directive.
# These line numbers will be used for debugging the configuration script.

${CAT_CMD} >"${FIREHOL_TMP}.awk" <<'EOF'
$1 == "action" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "blacklist" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "classify" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "client" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "connmark" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "dnat" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "dscp" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "ecn_shame" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "group" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "group4" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "group6" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "group46" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "interface" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "interface4" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "interface6" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "interface46" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "iptables" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "ip6tables" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "ipv4" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "ipv6" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "mac" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "mark" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "masquerade" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "nat" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "policy" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "postprocess" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "protection" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "redirect" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "require_kernel_module" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "router" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "router4" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "router6" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "router46" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "route" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "route4" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "route6" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "route46" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "server" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "server4" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "server6" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "server46" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "snat" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "tcpmss" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "tos" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "transparent_squid" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "transparent_proxy" { printf "FIREHOL_LINEID=${LINENO} " }
$1 == "version" { printf "FIREHOL_LINEID=${LINENO} " }
{ print }
EOF

# at the same time, replace all ${IPTABLES_CMD} references with just
# the word 'iptables' to protect the currently running firewall
SED_RULES=
if [ $ENABLE_IPV4 -eq 1 ]; then
	SED_RULES="${SED_RULES} -e s|${IPTABLES_CMD}|iptables|g"
fi
if [ $ENABLE_IPV6 -eq 1 ]; then
	SED_RULES="${SED_RULES} -e s|${IP6TABLES_CMD}|ip6tables|g"
fi
${CAT_CMD} ${FIREHOL_CONFIG} | ${SED_CMD} ${SED_RULES} | gawk_cmd -f "${FIREHOL_TMP}.awk" >${FIREHOL_TMP}
${RM_CMD} -f "${FIREHOL_TMP}.awk"

# ------------------------------------------------------------------------------
# Run the configuration file.

if [ -n "$WAIT_FOR_IFACE" ]
then
	for i in "$WAIT_FOR_IFACE"
	do
		wait_for_interface $i
	done
fi

enable -n trap			# Disable the trap buildin shell command.
enable -n exit			# Disable the exit buildin shell command.
{ source ${FIREHOL_TMP} "$@"; }	# Run the configuration as a normal script.
source_status=$?
[ $source_status -ne 0 ] && ret=$[ret + 1]
[ $source_status -ne 0 ] && FIREHOL_CLEAN_TMP=0
FIREHOL_LINEID="FIN"
enable trap			# Enable the trap buildin shell command.
enable exit			# Enable the exit buildin shell command.

close_cmd	|| ret=$[ret + 1]
close_master	|| ret=$[ret + 1]

if [ ${work_error} -gt 0 -o $ret -gt 0 ]
then
	echo >&2
	echo >&2 "NOTICE: No changes made to your firewall."
	failure $"FireHOL: Processing file ${FIREHOL_CONFIG}:"
	echo
	exit 1
fi

success $"FireHOL: Processing file ${FIREHOL_CONFIG}:"
echo

# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX


if [ ${FIREHOL_FAST_ACTIVATION} -eq 1 ]
then
	# construct the iptables-restore file from the splitted ones.
	cd $FIREHOL_DIR/fast/tables || exit 1
	for firehol_table in `ls`
	do
		(
			echo "*${firehol_table}"
			test -f $FIREHOL_DIR/fast/table.${firehol_table}.policy && ${CAT_CMD} $FIREHOL_DIR/fast/table.${firehol_table}.policy
			test -f $FIREHOL_DIR/fast/table.${firehol_table}.chains && ${CAT_CMD} $FIREHOL_DIR/fast/table.${firehol_table}.chains
			test -f $FIREHOL_DIR/fast/table.${firehol_table}.rules  && ${CAT_CMD} $FIREHOL_DIR/fast/table.${firehol_table}.rules
			echo "COMMIT"
		) >>${FIREHOL_OUTPUT}.fast
	done

	cd $FIREHOL_DIR/fast/table6s || exit 1
	for firehol_table in `ls`
	do
		(
			echo "*${firehol_table}"
			test -f $FIREHOL_DIR/fast/table6.${firehol_table}.policy && ${CAT_CMD} $FIREHOL_DIR/fast/table6.${firehol_table}.policy
			test -f $FIREHOL_DIR/fast/table6.${firehol_table}.chains && ${CAT_CMD} $FIREHOL_DIR/fast/table6.${firehol_table}.chains
			test -f $FIREHOL_DIR/fast/table6.${firehol_table}.rules  && ${CAT_CMD} $FIREHOL_DIR/fast/table6.${firehol_table}.rules
			echo "COMMIT"
		) >>${FIREHOL_OUTPUT}.fast6
	done
	
	if [ "${FIREHOL_MODE}" = "DEBUG" ]
	then
		test $ENABLE_IPV4 -eq 1 && ${CAT_CMD} ${FIREHOL_OUTPUT}.fast
		test $ENABLE_IPV6 -eq 1 && ${CAT_CMD} ${FIREHOL_OUTPUT}.fast6
		exit 1
	fi
	
	syslog info "Activating new firewall from ${FIREHOL_CONFIG} (translated to ${FIREHOL_COMMAND_COUNTER} iptables rules)."
	echo -n $"FireHOL: Fast activating new firewall:"
	
	initialize_firewall
	
	# execute any postprocessing commands
	# in FAST_ACTIVATION the output file does not have any iptables commands
	# it might have kernel modules management, activation of routing, etc.
	source ${FIREHOL_OUTPUT} "${@}"
	if [ $? -ne 0 ]
	then
		work_runtime_error=$[work_runtime_error+1]
	else
		# attempt to restore this firewall from the generated commands
		if [ $ENABLE_IPV4 -eq 1 ]
		then
			${IPTABLES_RESTORE_CMD} <${FIREHOL_OUTPUT}.fast >${FIREHOL_OUTPUT}.log 2>&1
			status4=$?
		else
			status4=0
		fi

		if [ $status4 -ne 0 ]
		then
			# it failed
			runtime_error error "CANNOT APPLY IN FAST MODE" FIN "${IPTABLES_RESTORE_CMD}" "<${FIREHOL_OUTPUT}.fast"

			work_runtime_error=$[work_runtime_error+1]
			
			# find the line
			echo >&2 "Offending line:"
			line=`cat "${FIREHOL_OUTPUT}.log" | grep "Error occurred at line: " | cut -d ':' -f 2`
			test -z "$line" && line=`cat "${FIREHOL_OUTPUT}.log" | grep "iptables-restore: line " | grep failed | cut -d ' ' -f 3`
			${CAT_CMD} "${FIREHOL_OUTPUT}.fast" | ${HEAD_CMD} -n $line | ${TAIL_CMD} -n 1 >&2
			echo >&2

			# the rest of the script will restore the original firewall
		else
			if [ $ENABLE_IPV6 -eq 1 ]
			then
				${IP6TABLES_RESTORE_CMD} <${FIREHOL_OUTPUT}.fast6 >>${FIREHOL_OUTPUT}.log 2>&1
				status6=$?
			else
				status6=0
			fi
			if [ $status6 -ne 0 ]
			then
				# it failed
				runtime_error error "CANNOT APPLY IN FAST MODE" FIN "${IP6TABLES_RESTORE_CMD}" "<${FIREHOL_OUTPUT}.fast6"

				work_runtime_error=$[work_runtime_error+1]

				# find the line
				echo >&2 "Offending line:"
				line=`cat "${FIREHOL_OUTPUT}.log" | grep "Error occurred at line: " | cut -d ':' -f 2`
				test -z "$line" && line=`cat "${FIREHOL_OUTPUT}.log" | grep "ip6tables-restore: line " | grep failed | cut -d ' ' -f 3`
				${CAT_CMD} "${FIREHOL_OUTPUT}.fast6" | ${HEAD_CMD} -n $line | ${TAIL_CMD} -n 1 >&2
				echo >&2

				# the rest of the script will restore the original firewall
			else
				finalize_firewall
			fi
		fi
	fi
else
	
	if [ "${FIREHOL_MODE}" = "DEBUG" ]
	then
		${CAT_CMD} ${FIREHOL_OUTPUT}
		exit 1
	fi
	
	syslog info "Activating new firewall from ${FIREHOL_CONFIG} (translated to ${FIREHOL_COMMAND_COUNTER} iptables rules)."
	echo -n $"FireHOL: Activating new firewall (${FIREHOL_COMMAND_COUNTER} rules):"
	
	initialize_firewall
	
	source ${FIREHOL_OUTPUT} "$@"
	if [ $? -ne 0 ]
	then
		work_runtime_error=$[work_runtime_error+1]
	else
		finalize_firewall
	fi
fi


if [ ${work_runtime_error} -gt 0 ]
then
	failure $"FireHOL: Activating new firewall:"
	echo
	
	syslog err "Activation of new firewall failed."
	# The trap will restore the firewall we saved above.
	
	if [ ${FIREHOL_FAST_ACTIVATION} -eq 1 ]
	then
		echo >&2
		echo >&2 "To get a more detailed report of the offending command,"
		echo >&2 "you can quickly re-apply the same firewall with fast"
		echo >&2 "activation disabled, like this:"
		echo >&2
		printf >&2 "${FIREHOL_FILE} nofast "
		printf >&2 "%q " "${FIREHOL_ORIGINAL_ARGS[@]}"
		printf >&2 "\n"
	fi

	exit 1
fi
success $"FireHOL: Activating new firewall (${FIREHOL_COMMAND_COUNTER} rules):"
echo
syslog info "Activation of new firewall succeeded."

if [ ${FIREHOL_TRY} -eq 1 ]
then
	syslog info "Waiting user to commit the new firewall."
	read -p "Keep the firewall? (type 'commit' to accept - 30 seconds timeout) : " -t 30 -e
	ret=$?
	echo
	if [ ! $ret -eq 0 -o ! "${REPLY}" = "commit" ]
	then
		syslog err "User did not confirm the new firewall."
		# The trap will restore the firewall.
		
		exit 1
	else
		echo "Successfull activation of FireHOL firewall."
		syslog info "User committed new firewall."
	fi
fi

# Remove the saved firewall, so that the trap will not restore it.
${RM_CMD} -f "${FIREHOL_SAVED}" "${FIREHOL_SAVED6}" >/dev/null 2>&1
FIREHOL_ACTIVATED_SUCCESSFULLY=1


# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# last, keep a copy of the firewall we activated, on disk

mv "${FIREHOL_DIR}/firewall_restore_commands.sh" "${FIREHOL_SPOOL_DIR}/firewall_restore_commands.sh"
chown root:root "${FIREHOL_SPOOL_DIR}/firewall_restore_commands.sh"
chmod 700 "${FIREHOL_SPOOL_DIR}/firewall_restore_commands.sh"

# keep track if we do ipv4
if [ $ENABLE_IPV4 -eq 1 ]
then
	touch "${FIREHOL_SPOOL_DIR}/ipv4.enable"
	chown root:root "${FIREHOL_SPOOL_DIR}/ipv4.enable"
	chmod 600 "${FIREHOL_SPOOL_DIR}/ipv4.enable"
else
	test -f "${FIREHOL_SPOOL_DIR}/ipv4.enable" && rm "${FIREHOL_SPOOL_DIR}/ipv4.enable"
fi

# keep track if we do ipv6
if [ $ENABLE_IPV6 -eq 1 ]
then
	touch "${FIREHOL_SPOOL_DIR}/ipv6.enable"
	chown root:root "${FIREHOL_SPOOL_DIR}/ipv6.enable"
	chmod 600 "${FIREHOL_SPOOL_DIR}/ipv6.enable"
else
	test -f "${FIREHOL_SPOOL_DIR}/ipv6.enable" && rm "${FIREHOL_SPOOL_DIR}/ipv6.enable"
fi

# save the rules to ${FIREHOL_SPOOL_DIR}
firehol_save_activated_firewall


# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

if [ ${FIREHOL_SAVE} -eq 1 ]
then
	if [ $ENABLE_IPV4 -eq 1 -a -z "${FIREHOL_AUTOSAVE}" ]
	then
		if [ -d "/etc/sysconfig" ]
		then
			# RedHat
			FIREHOL_AUTOSAVE="/etc/sysconfig/iptables"
		elif [ -d "/var/lib/iptables" ]
		then
			if [ -f /etc/conf.d/iptables ]
			then
				# Gentoo
				IPTABLES_SAVE=
				
				. /etc/conf.d/iptables
				FIREHOL_AUTOSAVE="${IPTABLES_SAVE}"
			fi
			
			if [ -z "${FIREHOL_AUTOSAVE}" ]
			then
				# Debian
				FIREHOL_AUTOSAVE="/var/lib/iptables/autosave"
			fi
		else
			error "Cannot find where to save iptables file. Please set FIREHOL_AUTOSAVE."
			echo
			exit 1
		fi
	fi
	if [ $ENABLE_IPV6 -eq 1 -a -z "${FIREHOL_AUTOSAVE6}" ]
	then
		error "Cannot find where to save ip6tables file. Please set FIREHOL_AUTOSAVE6."
		echo
		exit 1
	fi
	
	if [ $ENABLE_IPV4 -eq 1 ]
	then
		echo -n $"FireHOL: Saving firewall to ${FIREHOL_AUTOSAVE}:"
	
		cat "${FIREHOL_SPOOL_DIR}/ipv4.rules" >${FIREHOL_AUTOSAVE}
		if [ ! $? -eq 0 ]
		then
			syslog err "Failed to save new firewall to '${FIREHOL_AUTOSAVE}'."
			failure $"FireHOL: Saving firewall to ${FIREHOL_AUTOSAVE}:"
			echo
			exit 1
		fi

		syslog info "New firewall saved to '${FIREHOL_AUTOSAVE}'."
		success $"FireHOL: Saving firewall to ${FIREHOL_AUTOSAVE}:"
		echo
	fi

	if [ $ENABLE_IPV6 -eq 1 ]
	then
		echo -n $"FireHOL: Saving IPv6 firewall to ${FIREHOL_AUTOSAVE6}:"
	
		cat "${FIREHOL_SPOOL_DIR}/ipv6.rules" >${FIREHOL_AUTOSAVE6}
		if [ ! $? -eq 0 ]
		then
			syslog err "Failed to save new IPv6 firewall to '${FIREHOL_AUTOSAVE6}'."
			failure $"FireHOL: Saving IPv6 firewall to ${FIREHOL_AUTOSAVE6}:"
			echo
			exit 1
		fi

		syslog info "New IPv6 firewall saved to '${FIREHOL_AUTOSAVE6}'."
		success $"FireHOL: Saving IPv6 firewall to ${FIREHOL_AUTOSAVE6}:"
		echo
	fi
	
	exit 0
fi