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added option lower-level

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wangyu 2017-08-07 13:58:42 +08:00
parent 44852270ef
commit 307399b00a
9 changed files with 241 additions and 37 deletions
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6
README.md
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@ -10,8 +10,8 @@ Which can help you bypass udp blocking or udp QOS or just poorly supported udp N
encrypt your traffic with aes128cbc,protects data integrity by md5 or crc32,protect replay attack with an anti-replay window smiliar to ipsec/openvpn.
### Simulated TCP Handshake
simulated 3-way handshake,simluated seq ack_seq. Simluated tcp options:MSS,sackOk,TS,TS_ack,wscale. Provides real-time delivery ,no tcp over tcp problem when using openvpn.
### Connnection Recover
After connection timeouts,the client will re-connect.if re-connection is successful,the previous connection will be recovered,and all existed udp conversations will stay vaild.
### Connnection Failure Dectection & Recover
Conection failure detection by hearbeat. After hearbeat timeouts,client will auto change port and re-connect.if re-connection is successful,the previous connection will be recovered,and all existed udp conversations will stay vaild.
### Other Features
Multiplexing ,one client supports multi udp connections,all of those traffic will share one raw connection
@ -118,6 +118,8 @@ raw_mode: faketcp cipher_mode: aes128cbc  auth_mode: md5
2. no TCP ovr tcp problem (tcp over tcp problem http://sites.inka.de/bigred/devel/tcp-tcp.html ,https://community.openvpn.net/openvpn/ticket/2 )
3. openvpn over icmp also becomes a choice
more details at [openvpn+udp2raw_guide](/doc/openvpn_guide.md)
### tunneling kcptun
make kcptun support tcp mode.
(kcptun, https://github.com/xtaci/kcptun)

4
common.cpp
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@ -198,12 +198,12 @@ int set_buf_size(int fd)
{
if(setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
{
mylog(log_fatal,"SO_SNDBUFFORCE fail\n");
mylog(log_fatal,"SO_SNDBUFFORCE fail,fd %d\n",fd);
myexit(1);
}
if(setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
{
mylog(log_fatal,"SO_RCVBUFFORCE fail\n");
mylog(log_fatal,"SO_RCVBUFFORCE fail,fd %d\n",fd);
myexit(1);
}
return 0;

1
common.h
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@ -42,6 +42,7 @@
#include <arpa/inet.h>
#include <stdarg.h>
#include <assert.h>
#include <linux/if_packet.h>

11
doc/README.zh-cn.md
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@ -18,10 +18,12 @@ Udp2raw-tunnel
### 模拟TCP3次握手
模拟TCP3次握手，模拟seq ack过程。另外还模拟了一些tcp option：MSS,sackOk,TS,TS_ack,wscale，用来使流量看起来更像是由普通的linux tcp协议栈发送的。
### 连接快速恢复
### 连接保持，连接快速恢复
心跳机制检查连接是否中断，一旦心跳超时。client会立即换raw socket的端口重连，重连成功后会恢复之前中断的连接。虽然raw端的端口变了，但是udp端的所有连接都会继续有效。udp这边感觉不到raw端的重连，只会感觉到短暂断流,这跟普通的短暂丢包是类似的，不会导致上层应用重连。
另一个优化是，重连只需要client发起，就可以立即被server处理，不需要等到server端的连接超时后。
另一个优化是，重连只需要client发起，就可以立即被server处理，不需要等到server端的连接超时后。这个在单向连接失效的情况下有用。
另外，对于有大量client的情况，对于不同client,server发送的心跳是错开时间发送的，不会因为短时间发送大量的心跳而造成拥塞和延迟抖动。
### 其他特性
信道复用，client的udp端支持多个连接。
@ -32,7 +34,10 @@ NAT 穿透 ，tcp icmp udp模式都支持nat穿透。
支持Openvz，配合finalspeed使用，可以在openvz上用tcp模式的finalspeed
支持Openwrt,没有编译以来，容易编译到任何平台上。release中提供了ar71xx版本的binary
支持Openwrt,没有编译依赖，容易编译到任何平台上。release中提供了ar71xx版本的binary
单进程，纯异步，无锁，高并发，除了回收过期连接外，所有操作的时间复杂度都跟连接数无关。回收过期连接这个操作是个批量操作，会定期进行，但是会保证一次回收的数量不超过总数的1/10（可配置），不会造成延迟抖动。
### 关键词
突破udp qos,突破udp屏蔽，openvpn tcp over tcp problem,openvpn over icmp,udp to icmp tunnel,udp to tcp tunnel,udp via icmp,udp via tcp

87
doc/openvpn_guide.md
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@ -1 +1,88 @@
# udp2raw+openvpn config guide
![image_vpn](/images/openvpn.PNG)
![image4](/images/image4.PNG)
# udp2raw command
#### run at server side
```
./udp2raw_amd64 -s -l0.0.0.0:8855 -r 127.0.0.1:7777 -k "passwd" --raw-mode faketcp -a
```
#### run at client side
assume server ip is 45.66.77.88
```
./udp2raw_amd64 -s -l0.0.0.0:3333 -r 45.66.77.88:8855 -k "passwd" --raw-mode faketcp -a
```
# openvpn config
#### client side config
```
remote 127.0.0.1 3333
resolv-retry infinite
nobind
persist-key
persist-tun
ca /root/add-on/openvpn/ca.crt
cert /root/add-on/openvpn/client.crt
key /root/add-on/openvpn/client.key
keepalive 3 20
verb 3
mute 20
comp-lzo no
cipher none ##### disable openvpn 's cipher and auth for maxmized peformance.
auth none ##### you can enable openvpn's cipher and auth,if you dont care about peformance,oryou dont trust udp2raw 's encryption
fragment 1200 ##### very important you can turn it up a bit. but,the lower the safer
mssfix 1200 ##### very important
sndbuf 2000000 ##### important
rcvbuf 2000000 ##### important
txqueuelen 4000 ##### suggested
```
#### server side config
```
local 0.0.0.0
port 7777
proto udp
dev tun
ca /etc/openvpn/easy-rsa/2.0/keys/ca.crt
cert /etc/openvpn/easy-rsa/2.0/keys/server.crt
key /etc/openvpn/easy-rsa/2.0/keys/server.key
dh /etc/openvpn/easy-rsa/2.0/keys/dh1024.pem
server 10.222.2.0 255.255.255.0
ifconfig 10.222.2.1 10.222.2.6
client-to-client
duplicate-cn
keepalive 10 60
max-clients 50
persist-key
persist-tun
status /etc/openvpn/openvpn-status.log
verb 3
mute 20
comp-lzo no
cipher none ##### disable openvpn 's cipher and auth for maxmized peformance.
auth none ##### you can enable openvpn's cipher and auth,if you dont care about peformance,oryou dont trust udp2raw 's encryption
fragment 1200 ##### very important you can turn it up a bit. but,the lower the safer
mssfix 1200 ##### very important
sndbuf 2000000 ##### important
rcvbuf 2000000 ##### important
txqueuelen 4000 ##### suggested
```

20
main.cpp
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@ -38,6 +38,7 @@ int disable_anti_replay=0;
char key_string[1000]= "secret key";
char key[16];//,key2[16];
//uint64_t current_time_rough=0;
@ -2351,6 +2352,7 @@ void process_arg(int argc, char *argv[])
{"gen-rule", no_argument, 0, 'g'},
{"debug", no_argument, 0, 1},
{"clear", no_argument, 0, 1},
{"lower-level", required_argument, 0, 1},
{"sock-buf", required_argument, 0, 1},
{"seq-mode", required_argument, 0, 1},
{NULL, 0, 0, 0}
@ -2544,6 +2546,24 @@ void process_arg(int argc, char *argv[])
else if(strcmp(long_options[option_index].name,"log-level")==0)
{
}
else if(strcmp(long_options[option_index].name,"lower-level")==0)
{
if(strchr(optarg,'#')==0)
{
mylog(log_fatal,"lower-level parameter invaild,should be if_name#mac_adress ,ie eth0#00:23:45:67:89:b9\n");
myexit(-1);
}
lower_level=1;
u32_t hw[6];
memset(hw,0,sizeof(hw));
sscanf(optarg,"%[^#]#%x:%x:%x:%x:%x:%x",if_name,&hw[0],&hw[1],&hw[2],&hw[3],&hw[4],&hw[5]);
mylog(log_warn,"make sure this is correct: ifname=<%s> gateway_hw_hd=<%x:%x:%x:%x:%x:%x> \n",if_name,hw[0],hw[1],hw[2],hw[3],hw[4],hw[5]);
for(int i=0;i<6;i++)
{
oppsite_hw_addr[i]=uint8_t(hw[i]);
}
}
else if(strcmp(long_options[option_index].name,"disable-color")==0)
{
//enable_log_color=0;

13
makefile
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@ -4,13 +4,18 @@ FLAGS2= -O3
all:
sudo killall udp2raw||true
sleep 0.2
g++ main.cpp -o udp2raw_amd64 -static -ggdb -I. lib/aes.c lib/md5.c encrypt.cpp log.cpp network.cpp common.cpp -lrt -std=c++11 ${FLAGS} ${FLAGS2}
${ccmips} main.cpp -o udp2raw_ar71xx -lrt -I. lib/aes.c lib/md5.c encrypt.cpp log.cpp network.cpp common.cpp -std=c++11 ${FLAGS} ${FLAGS2}
g++ main.cpp -o udp2raw -static -ggdb -I. lib/aes.c lib/md5.c encrypt.cpp log.cpp network.cpp common.cpp -lrt -std=c++11 ${FLAGS} ${FLAGS2}
# ${ccmips} main.cpp -o udp2raw_ar71xx -lrt -I. lib/aes.c lib/md5.c encrypt.cpp log.cpp network.cpp common.cpp -std=c++11 ${FLAGS} ${FLAGS2}
fast:
sudo killall udp2raw||true
sleep 0.2
g++ main.cpp -o udp2raw_amd64 -ggdb -I. lib/aes.c lib/md5.c encrypt.cpp log.cpp network.cpp common.cpp -lrt -std=c++11 ${FLAGS}
g++ main.cpp -o udp2raw -ggdb -I. lib/aes.c lib/md5.c encrypt.cpp log.cpp network.cpp common.cpp -lrt -std=c++11 ${FLAGS}
debug:
g++ main.cpp -o udp2raw_amd64 -static -ggdb -I. -Ilib lib/aes.c lib/md5.c encrypt.cpp log.cpp network.cpp common.cpp -lrt -std=c++11 ${FLAGS} -Wformat-nonliteral -D MY_DEBUG
g++ main.cpp -o udp2raw -static -ggdb -I. -Ilib lib/aes.c lib/md5.c encrypt.cpp log.cpp network.cpp common.cpp -lrt -std=c++11 ${FLAGS} -Wformat-nonliteral -D MY_DEBUG
release:
g++ main.cpp -o udp2raw_amd64 -static -ggdb -I. lib/aes.c lib/md5.c encrypt.cpp log.cpp network.cpp common.cpp -lrt -std=c++11 ${FLAGS} ${FLAGS2}
${ccmips} main.cpp -o udp2raw_ar71xx -lrt -I. lib/aes.c lib/md5.c encrypt.cpp log.cpp network.cpp common.cpp -std=c++11 ${FLAGS} ${FLAGS2}

131
network.cpp
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@ -20,7 +20,13 @@ int disable_bpf_filter=0; //for test only,most time no need to disable this
u32_t bind_address_uint32=0;
int lower_level=0;
int ifindex=-1;
char if_name[100]="";
unsigned char oppsite_hw_addr[6]=
{0xff,0xff,0xff,0xff,0xff,0xff};
//{0x00,0x23,0x45,0x67,0x89,0xb9};
struct sock_filter code_tcp_old[] = {
{ 0x28, 0, 0, 0x0000000c },//0
@ -156,20 +162,47 @@ packet_info_t::packet_info_t()
int init_raw_socket()
{
raw_send_fd = socket(AF_INET , SOCK_RAW , IPPROTO_TCP);
if(lower_level==0)
{
raw_send_fd = socket(AF_INET , SOCK_RAW , IPPROTO_TCP);
if(raw_send_fd == -1) {
mylog(log_fatal,"Failed to create raw_send_fd\n");
//perror("Failed to create raw_send_fd");
myexit(1);
}
int one = 1;
const int *val = &one;
if (setsockopt (raw_send_fd, IPPROTO_IP, IP_HDRINCL, val, sizeof (one)) < 0) {
mylog(log_fatal,"Error setting IP_HDRINCL %d\n",errno);
//perror("Error setting IP_HDRINCL");
myexit(2);
}
if(raw_send_fd == -1) {
mylog(log_fatal,"Failed to create raw_send_fd\n");
//perror("Failed to create raw_send_fd");
myexit(1);
}
}
else
{
raw_send_fd = socket(PF_PACKET , SOCK_DGRAM , htons(ETH_P_IP));
if(raw_send_fd == -1) {
mylog(log_fatal,"Failed to create raw_send_fd\n");
//perror("Failed to create raw_send_fd");
myexit(1);
}
init_ifindex(if_name);
}
if(setsockopt(raw_send_fd, SOL_SOCKET, SO_SNDBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
{
mylog(log_fatal,"SO_SNDBUFFORCE fail\n");
myexit(1);
}
//raw_fd = socket(AF_PACKET, SOCK_DGRAM, htons(ETH_P_ALL));
raw_recv_fd= socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
@ -188,13 +221,7 @@ int init_raw_socket()
//IP_HDRINCL to tell the kernel that headers are included in the packet
int one = 1;
const int *val = &one;
if (setsockopt (raw_send_fd, IPPROTO_IP, IP_HDRINCL, val, sizeof (one)) < 0) {
mylog(log_fatal,"Error setting IP_HDRINCL %d\n",errno);
//perror("Error setting IP_HDRINCL");
myexit(2);
}
setnonblocking(raw_send_fd); //not really necessary
setnonblocking(raw_recv_fd);
@ -258,8 +285,26 @@ void remove_filter()
//exit(-1);
}
}
int init_ifindex(char * if_name)
{
struct ifreq ifr;
size_t if_name_len=strlen(if_name);
if (if_name_len<sizeof(ifr.ifr_name)) {
memcpy(ifr.ifr_name,if_name,if_name_len);
ifr.ifr_name[if_name_len]=0;
} else {
mylog(log_fatal,"interface name is too long\n");
myexit(-1);
}
if (ioctl(raw_send_fd,SIOCGIFINDEX,&ifr)==-1) {
mylog(log_fatal,"SIOCGIFINDEX fail ,%s\n",strerror(errno));
myexit(-1);
}
ifindex=ifr.ifr_ifindex;
mylog(log_info,"ifname:%s ifindex:%d\n",if_name,ifindex);
return 0;
}
int send_raw_ip(raw_info_t &raw_info,const char * payload,int payloadlen)
@ -271,17 +316,20 @@ int send_raw_ip(raw_info_t &raw_info,const char * payload,int payloadlen)
struct iphdr *iph = (struct iphdr *) send_raw_ip_buf;
memset(iph,0,sizeof(iphdr));
struct sockaddr_in sin;
sin.sin_family = AF_INET;
//sin.sin_port = htons(info.dst_port); //dont need this
sin.sin_addr.s_addr = send_info.dst_ip;
static unsigned short ip_id=1;
iph->ihl = sizeof(iphdr)/4; //we dont use ip options,so the length is just sizeof(iphdr)
iph->version = 4;
iph->tos = 0;
// iph->id = htonl (ip_id++); //Id of this packet
// iph->id = 0; //Id of this packet ,kernel will auto fill this if id is zero
if(lower_level)
{
iph->id=0;
//iph->id = htons (ip_id++); //Id of this packet
}
else
iph->id = 0; //Id of this packet ,kernel will auto fill this if id is zero ,or really?????// todo //seems like there is a problem
iph->frag_off = htons(0x4000); //DF set,others are zero
// iph->frag_off = htons(0x0000); //DF set,others are zero
iph->ttl = 64;
@ -291,20 +339,51 @@ int send_raw_ip(raw_info_t &raw_info,const char * payload,int payloadlen)
iph->daddr = send_info.dst_ip;
uint16_t ip_tot_len=sizeof (struct iphdr)+payloadlen;
// iph->tot_len = htons(ip_tot_len); //this is not necessary ,kernel will always auto fill this //http://man7.org/linux/man-pages/man7/raw.7.html
//iph->tot_len = ip_tot_len;
if(lower_level)iph->tot_len = htons(ip_tot_len); //this is not necessary ,kernel will always auto fill this //http://man7.org/linux/man-pages/man7/raw.7.html
else
iph->tot_len = 0;
memcpy(send_raw_ip_buf+sizeof(iphdr) , payload, payloadlen);
//iph->check = csum ((unsigned short *) send_raw_ip_buf, ip_tot_len); //this is not necessary ,kernel will always auto fill this
if(lower_level) iph->check =
csum ((unsigned short *) send_raw_ip_buf, iph->ihl*4); //this is not necessary ,kernel will always auto fill this
else
iph->check=0;
int ret = sendto(raw_send_fd, send_raw_ip_buf, ip_tot_len , 0, (struct sockaddr *) &sin, sizeof (sin));
int ret;
if(lower_level==0)
{
struct sockaddr_in sin;
sin.sin_family = AF_INET;
//sin.sin_port = htons(info.dst_port); //dont need this
sin.sin_addr.s_addr = send_info.dst_ip;
ret = sendto(raw_send_fd, send_raw_ip_buf, ip_tot_len , 0, (struct sockaddr *) &sin, sizeof (sin));
}
else
{
struct sockaddr_ll addr;
memset(&addr,0,sizeof(addr));
addr.sll_family=AF_PACKET;
addr.sll_ifindex=ifindex;
addr.sll_halen=ETHER_ADDR_LEN;
addr.sll_protocol=htons(ETH_P_IP);
memcpy(addr.sll_addr,oppsite_hw_addr,ETHER_ADDR_LEN);
ret = sendto(raw_send_fd, send_raw_ip_buf, ip_tot_len , 0, (struct sockaddr *) &addr, sizeof (addr));
}
if(ret==-1)
{
mylog(log_debug,"sendto failed\n");
mylog(log_trace,"sendto failed\n");
//perror("why?");
return -1;
}
else
{
//mylog(log_info,"sendto succ\n");
}
return 0;
}
int peek_raw(packet_info_t &peek_info)
@ -426,7 +505,7 @@ int recv_raw_ip(raw_info_t &raw_info,char * &payload,int &payloadlen)
if(ip_chk!=0)
{
mylog(log_debug,"ip header error %d\n",ip_chk);
mylog(log_debug,"ip header error %x\n",ip_chk);
return -1;
}

5
network.h
View File

@ -15,6 +15,10 @@ extern int filter_port;
extern u32_t bind_address_uint32;
extern int disable_bpf_filter;
extern int lower_level;
extern char if_name[100];
extern unsigned char oppsite_hw_addr[];
struct icmphdr
{
uint8_t type;
@ -76,6 +80,7 @@ int init_raw_socket();
void init_filter(int port);
void remove_filter();
int init_ifindex(char * if_name);
int send_raw_ip(raw_info_t &raw_info,const char * payload,int payloadlen);