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implement dummy socket

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wangyu- 2018-06-15 11:47:57 -05:00
parent ba6d5e8895
commit 33d96331fe
5 changed files with 69 additions and 14 deletions
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68
main.cpp
View File

@ -20,6 +20,8 @@ int use_udp_for_detection=0;
int use_tcp_for_detection=1;
int client_on_timer(conn_info_t &conn_info) //for client. called when a timer is ready in epoll
{
packet_info_t &send_info=conn_info.raw_info.send_info;
@ -138,13 +140,15 @@ int client_on_timer(conn_info_t &conn_info) //for client. called when a timer is
if (source_port == 0)
{
send_info.src_port = client_bind_to_a_new_port(bind_fd,local_ip_uint32);
send_info.src_port = client_bind_to_a_new_port(bind_fd,0);
}
else
{
send_info.src_port = source_port;
assert(try_to_list_and_bind(bind_fd,0,source_port)==0);
}
if (raw_mode == mode_icmp)
{
send_info.dst_port = send_info.src_port;
@ -161,8 +165,30 @@ int client_on_timer(conn_info_t &conn_info) //for client. called when a timer is
}
if(raw_mode==mode_faketcp)
{
conn_info.state.client_current_state=client_tcp_handshake;
mylog(log_info,"state changed from client_idle to client_tcp_handshake\n");
if(use_tcp_dummy_socket)
{
struct sockaddr_in remote_addr_in={0};
socklen_t slen = sizeof(sockaddr_in);
//memset(&remote_addr_in, 0, sizeof(remote_addr_in));
remote_addr_in.sin_family = AF_INET;
remote_addr_in.sin_port = htons(remote_port);
remote_addr_in.sin_addr.s_addr = remote_ip_uint32;
//int new_tcp_fd=socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
setnonblocking(bind_fd);
int ret=connect(bind_fd,(struct sockaddr *)&remote_addr_in,sizeof(remote_addr_in));
mylog(log_info,"ret=%d,errno=%s,%d %d\n",ret,strerror(errno),bind_fd,remote_port);
conn_info.state.client_current_state=client_tcp_handshake_dummy;
mylog(log_info,"state changed from client_idle to client_tcp_handshake_dummy\n");
}
else
{
conn_info.state.client_current_state=client_tcp_handshake;
mylog(log_info,"state changed from client_idle to client_tcp_handshake\n");
}
}
conn_info.last_state_time=get_current_time();
@ -207,6 +233,17 @@ int client_on_timer(conn_info_t &conn_info) //for client. called when a timer is
}
return 0;
}
else if(conn_info.state.client_current_state==client_tcp_handshake_dummy)
{
assert(raw_mode==mode_faketcp);
if (get_current_time() - conn_info.last_state_time > client_handshake_timeout)
{
conn_info.state.client_current_state = client_idle;
mylog(log_info, "state back to client_idle from client_tcp_handshake_dummy\n");
return 0;
}
}
else if(conn_info.state.client_current_state==client_handshake1)//send and resend handshake1
{
if(get_current_time()-conn_info.last_state_time>client_handshake_timeout)
@ -232,7 +269,9 @@ int client_on_timer(conn_info_t &conn_info) //for client. called when a timer is
send_info.psh = 0;
send_info.syn = 0;
send_info.ack = 1;
send_raw0(raw_info, 0, 0);
if(!use_tcp_dummy_socket)
send_raw0(raw_info, 0, 0);
send_handshake(raw_info,conn_info.my_id,0,const_id);
@ -359,7 +398,7 @@ int client_on_raw_recv(conn_info_t &conn_info) //called when raw fd received a p
//my_queue.pop_front();
//pthread_mutex_unlock(&queue_mutex);
}
else if(conn_info.state.client_current_state==client_tcp_handshake)//received syn ack
else if(conn_info.state.client_current_state==client_tcp_handshake||conn_info.state.client_current_state==client_tcp_handshake_dummy)//received syn ack
{
assert(raw_mode==mode_faketcp);
if(recv_raw0(raw_info,data,data_len)<0)
@ -373,14 +412,23 @@ int client_on_raw_recv(conn_info_t &conn_info) //called when raw fd received a p
}
if(data_len==0&&raw_info.recv_info.syn==1&&raw_info.recv_info.ack==1)
{
if(recv_info.ack_seq!=send_info.seq+1)
if(conn_info.state.client_current_state==client_tcp_handshake)
{
mylog(log_debug,"seq ack_seq mis match\n");
return -1;
if(recv_info.ack_seq!=send_info.seq+1)
{
mylog(log_debug,"seq ack_seq mis match\n");
return -1;
}
mylog(log_info,"state changed from client_tcp_handshake to client_handshake1\n");
}
else
{
send_info.seq=recv_info.ack_seq-1;
mylog(log_info,"state changed from client_tcp_dummy to client_handshake1\n");
//send_info.ack_seq=recv_info.seq+1;
}
conn_info.state.client_current_state = client_handshake1;
mylog(log_info,"state changed from client_tcp_handshake to client_handshake1\n");
conn_info.last_state_time = get_current_time();
conn_info.last_hb_sent_time=0;
client_on_timer(conn_info);

6
misc.cpp
View File

@ -285,6 +285,7 @@ void process_arg(int argc, char *argv[]) //process all options
{"dev", required_argument, 0, 1},
{"dns-resolve", no_argument, 0, 1},
{"pcap-send", no_argument, 0, 1},
{"easy-tcp", no_argument, 0, 1},
{NULL, 0, 0, 0}
};
@ -681,6 +682,11 @@ void process_arg(int argc, char *argv[]) //process all options
send_with_pcap=1;
mylog(log_info,"--pcap-send enabled, now pcap will be used for sending packet instead of libnet\n");
}
else if(strcmp(long_options[option_index].name,"easy-tcp")==0)
{
use_tcp_dummy_socket=1;
mylog(log_info,"--easy-tcp enabled, now a dummy tcp socket will be created for handshake and block rst\n");
}
else
{
mylog(log_warn,"ignored unknown long option ,option_index:%d code:<%x>\n",option_index, optopt);

2
misc.h
View File

@ -62,7 +62,7 @@ const uint32_t server_conn_timeout=conv_timeout+60000;//ms. this should be 60s+
const u32_t iptables_rule_keep_interval=20;//unit: second;
enum server_current_state_t {server_idle=0,server_handshake1,server_ready}; //server state machine
enum client_current_state_t {client_idle=0,client_tcp_handshake,client_handshake1,client_handshake2,client_ready};//client state machine
enum client_current_state_t {client_idle=0,client_tcp_handshake,client_handshake1,client_handshake2,client_ready,client_tcp_handshake_dummy};//client state machine
enum raw_mode_t{mode_faketcp=0,mode_udp,mode_icmp,mode_end};
enum program_mode_t {unset_mode=0,client_mode,server_mode};

6
network.cpp
View File

@ -67,6 +67,7 @@ int send_with_pcap=0;
int pcap_header_captured=0;
int pcap_header_buf[buf_len];
int use_tcp_dummy_socket=0;
/*
struct sock_filter code_tcp_old[] = {
{ 0x28, 0, 0, 0x0000000c },//0
@ -2138,7 +2139,7 @@ int try_to_list_and_bind(int &fd,u32_t local_ip_uint32,int port) //try to bind
if(raw_mode==mode_faketcp)
{
fd=socket(AF_INET,SOCK_STREAM,0);
fd=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
}
else if(raw_mode==mode_udp||raw_mode==mode_icmp)
{
@ -2161,9 +2162,8 @@ int try_to_list_and_bind(int &fd,u32_t local_ip_uint32,int port) //try to bind
mylog(log_debug,"bind fail\n");
return -1;
}
if(raw_mode==mode_faketcp)
if(raw_mode==mode_faketcp &&!use_tcp_dummy_socket)
{
if (listen(fd, SOMAXCONN) != 0) {
mylog(log_warn,"listen fail\n");
return -1;

1
network.h
View File

@ -45,6 +45,7 @@ extern int send_with_pcap;
extern int pcap_header_captured;
extern int pcap_header_buf[buf_len];
extern int use_tcp_dummy_socket;
struct icmphdr
{
uint8_t type;