fix last commit

new option disable-checksum
fixed get_current_time()
2025-09-17 12:44:31 +08:00 · 2018-08-03 17:01:19 -05:00 · 2018-08-03 16:43:56 -05:00 · 2017-11-24 11:07:37 -06:00 · 2017-11-23 09:58:53 -06:00 · 2017-11-23 09:42:52 -06:00
19 changed files with 482 additions and 755 deletions
--- a/ISSUE_TEMPLATE.md
+++ b/ISSUE_TEMPLATE.md
@@ -0,0 +1,6 @@
+For English speaking user：
+https://github.com/wangyu-/UDPspeeder/wiki/Issue-Guide
+
+中文用户请看：
+https://github.com/wangyu-/UDPspeeder/wiki/发Issue前请看
+(否则Issue可能被忽略，或被直接关掉)
--- a/README.md
+++ b/README.md
@@ -10,11 +10,22 @@ or

 ![image_vpn](/images/en/udpspeeder+openvpn3.PNG)

+Assume your local network to your server is lossy. Just establish a VPN connection to your server with UDPspeeder + any UDP-based VPN, access your server via this VPN connection, then your connection quality will be significantly improved. With well-tuned parameters , you can easily reduce IP or UDP/ICMP packet-loss-rate to less than 0.01% . Besides reducing packet-loss-rate, UDPspeeder can also significantly improve your TCP latency and TCP single-thread download speed.
+
 [简体中文](/doc/README.zh-cn.md)(内容更丰富)

 ###### Note
-You can use udp2raw with UDPspeeder together to bypass UDP firewalls.
-udp2raw：https://github.com/wangyu-/udp2raw-tunnel
+You can use udp2raw with UDPspeeder together to get better speed on some ISP with UDP QoS(UDP throttling).
+
+udp2raw's repo：
+
+https://github.com/wangyu-/udp2raw-tunnel
+
+You can also try tinyFecVPN, a lightweight high-performance VPN with build-in FEC support:
+
+tinyFecVPN's repo:
+
+https://github.com/wangyu-/tinyFecVPN


 # Efficacy
@@ -29,7 +40,7 @@ tested on a link with 100ms latency and 10% packet loss at both direction
 # Supported Platforms
 Linux host (including desktop Linux,Android phone/tablet, OpenWRT router, or Raspberry PI).

-For Windows and MacOS You can run UDPspeeder inside [this](https://github.com/wangyu-/udp2raw-tunnel/releases/download/20170918.0/lede-17.01.2-x86_virtual_machine_image_with_udp2raw_pre_installed.zip) 7.5mb virtual machine image.
+For Windows and MacOS You can run UDPspeeder inside [this](https://github.com/wangyu-/udp2raw-tunnel/releases/download/20171108.0/lede-17.01.2-x86_virtual_machine_image.zip) 7.5mb virtual machine image.

 # How does it work

@@ -67,60 +78,60 @@ Assume your server ip is 44.55.66.77, you have a service listening on udp port 7
 ./speederv2 -c -l0.0.0.0:3333  -r44.55.66.77:4096 -f20:10 -k "passwd"
 ```

-Now connecting to UDP port 3333 at the client side is equivalent to connecting to port 7777 at the server side, and the connection is boosted by UDPspeeder.
+Now connecting to UDP port 3333 at the client side is equivalent to connecting to port 7777 at the server side, and the connection has been boosted by UDPspeeder.

 ##### Note

 `-f20:10` means sending 10 redundant packets for every 20 original packets.

-`-k` enables simple XOR encryption to confuse DPI(Deep Packet Inspection)
-
-To run stably, pay attention to MTU.
+`-k` enables simple XOR encryption

 # Advanced Topic
 ### Full Options
 ```
 UDPspeeder V2
-git version:8e7a8aed92    build date:Oct 25 2017 02:00:54
+git version: 6f55b8a2fc    build date: Nov 19 2017 06:11:23
 repository: https://github.com/wangyu-/UDPspeeder

 usage:
-    run as client : ./this_program -c -l local_listen_ip:local_port -r server_ip:server_port  [options]
-    run as server : ./this_program -s -l server_listen_ip:server_port -r remote_ip:remote_port  [options]
+    run as client: ./this_program -c -l local_listen_ip:local_port -r server_ip:server_port  [options]
+    run as server: ./this_program -s -l server_listen_ip:server_port -r remote_ip:remote_port  [options]

-common option,must be same on both sides:
-    -k,--key              <string>        key for simple xor encryption. if not set,xor is disabled
+common options, must be same on both sides:
+    -k,--key              <string>        key for simple xor encryption. if not set, xor is disabled
 main options:
-    -f,--fec              x:y             forward error correction,send y redundant packets for every x packets
-    --timeout             <number>        how long could a packet be held in queue before doing fec,unit: ms,default :8ms
-    --mode                <number>        fec-mode,available values: 0,1 ; 0 cost less bandwidth,1 cost less latency(default)
-    --report              <number>        turn on send/recv report,and set a period for reporting,unit:s
+    -f,--fec              x:y             forward error correction, send y redundant packets for every x packets
+    --timeout             <number>        how long could a packet be held in queue before doing fec, unit: ms, default: 8ms
+    --report              <number>        turn on send/recv report, and set a period for reporting, unit: s
 advanced options:
-    --mtu                 <number>        mtu. for mode 0,the program will split packet to segment smaller than mtu_value.
-                                          for mode 1,no packet will be split,the program just check if the mtu is exceed.
-                                          default value:1250
-    -j,--jitter           <number>        simulated jitter.randomly delay first packet for 0~<number> ms,default value:0.
+    --mode                <number>        fec-mode,available values: 0,1; mode 0(default) costs less bandwidth,no mtu problem.
+                                          mode 1 usually introduces less latency, but you have to care about mtu.
+    --mtu                 <number>        mtu. for mode 0, the program will split packet to segment smaller than mtu value.
+                                          for mode 1, no packet will be split, the program just check if the mtu is exceed.
+                                          default value: 1250. you typically shouldnt change this value.
+    -q,--queue-len        <number>        fec queue len, only for mode 0, fec will be performed immediately after queue is full.
+                                          default value: 200. 
+    -j,--jitter           <number>        simulated jitter. randomly delay first packet for 0~<number> ms, default value: 0.
                                          do not use if you dont know what it means.
-    -i,--interval         <number>        scatter each fec group to a interval of <number> ms,to protect burst packet loss.
-                                          default value:0.do not use if you dont know what it means.
-    --random-drop         <number>        simulate packet loss ,unit:0.01%. default value: 0
-    --disable-obscure     <number>        disable obscure,to save a bit bandwidth and cpu
+    -i,--interval         <number>        scatter each fec group to a interval of <number> ms, to protect burst packet loss.
+                                          default value: 0. do not use if you dont know what it means.
+    --random-drop         <number>        simulate packet loss, unit: 0.01%. default value: 0.
+    --disable-obscure     <number>        disable obscure, to save a bit bandwidth and cpu.
 developer options:
-    --fifo                <string>        use a fifo(named pipe) for sending commands to the running program,so that you
-                                          can change fec encode parameters dynamically,check readme.md in repository for
+    --fifo                <string>        use a fifo(named pipe) for sending commands to the running program, so that you
+                                          can change fec encode parameters dynamically, check readme.md in repository for
                                          supported commands.
-    -j ,--jitter          jmin:jmax       similiar to -j above,but create jitter randomly between jmin and jmax
-    -i,--interval         imin:imax       similiar to -i above,but scatter randomly between imin and imax
-    -q,--queue-len        <number>        max fec queue len,only for mode 0
-    --decode-buf          <number>        size of buffer of fec decoder,unit:packet,default:2000
-    --fix-latency         <number>        try to stabilize latency,only for mode 0
+    -j ,--jitter          jmin:jmax       similiar to -j above, but create jitter randomly between jmin and jmax
+    -i,--interval         imin:imax       similiar to -i above, but scatter randomly between imin and imax
+    --decode-buf          <number>        size of buffer of fec decoder,u nit: packet, default: 2000
+    --fix-latency         <number>        try to stabilize latency, only for mode 0
    --delay-capacity      <number>        max number of delayed packets
-    --disable-fec         <number>        completely disable fec,turn the program into a normal udp tunnel
-    --sock-buf            <number>        buf size for socket,>=10 and <=10240,unit:kbyte,default:1024
+    --disable-fec         <number>        completely disable fec, turn the program into a normal udp tunnel
+    --sock-buf            <number>        buf size for socket, >=10 and <=10240, unit: kbyte, default: 1024
 log and help options:
-    --log-level           <number>        0:never    1:fatal   2:error   3:warn
-                                          4:info (default)     5:debug   6:trace
-    --log-position                        enable file name,function name,line number in log
+    --log-level           <number>        0: never    1: fatal   2: error   3: warn 
+                                          4: info (default)      5: debug   6: trace
+    --log-position                        enable file name, function name, line number in log
    --disable-color                       disable log color
    -h,--help                             print this help message

--- a/common.cpp
+++ b/common.cpp
@@ -52,7 +52,7 @@ u64_t get_current_time()//ms
 {
 	timespec tmp_time;
 	clock_gettime(CLOCK_MONOTONIC, &tmp_time);
-	return tmp_time.tv_sec*1000+tmp_time.tv_nsec/(1000*1000l);
+	return ((u64_t)tmp_time.tv_sec)*1000llu+((u64_t)tmp_time.tv_nsec)/(1000*1000llu);
 }

 u64_t get_current_time_us()
@@ -260,6 +260,39 @@ unsigned short csum(const unsigned short *ptr,int nbytes) {

    return(answer);
 }
+
+
+unsigned short tcp_csum(const pseudo_header & ph,const unsigned short *ptr,int nbytes) {//works both for big and little endian
+
+	register long sum;
+    unsigned short oddbyte;
+    register short answer;
+
+    sum=0;
+	unsigned short * tmp= (unsigned short *)&ph;
+	for(int i=0;i<6;i++)
+	{
+		sum+=*tmp++;
+	}
+
+
+    while(nbytes>1) {
+        sum+=*ptr++;
+        nbytes-=2;
+    }
+    if(nbytes==1) {
+        oddbyte=0;
+        *((u_char*)&oddbyte)=*(u_char*)ptr;
+        sum+=oddbyte;
+    }
+
+    sum = (sum>>16)+(sum & 0xffff);
+    sum = sum + (sum>>16);
+    answer=(short)~sum;
+
+    return(answer);
+}
+
 int set_buf_size(int fd,int socket_buf_size,int force_socket_buf)
 {
 	if(force_socket_buf)
--- a/common.h
+++ b/common.h
@@ -67,10 +67,11 @@ typedef u64_t my_time_t;
 const int max_data_len=2200;
 const int buf_len=max_data_len+200;

-const u32_t conv_clear_interval=200;
+
 //const u32_t timer_interval=400;
 ////const u32_t conv_timeout=180000;
-const u32_t conv_timeout=40000;//for test
+//const u32_t conv_timeout=40000;//for test
+const u32_t conv_timeout=180000;
 const int max_conv_num=10000;
 const int max_conn_num=200;

@@ -85,12 +86,12 @@ const u32_t client_retry_interval=1000;

 const u32_t server_handshake_timeout=10000;// this should be much longer than clients. client retry initially ,server retry passtively*/

-const int conv_clear_ratio=10;  //conv grabage collecter check 1/10 of all conv one time
-const int conn_clear_ratio=10;
-const int conv_clear_min=5;
+const int conv_clear_ratio=30;  //conv grabage collecter check 1/30 of all conv one time
+const int conn_clear_ratio=50;
+const int conv_clear_min=1;
 const int conn_clear_min=1;

-
+const u32_t conv_clear_interval=1000;
 const u32_t conn_clear_interval=1000;


@@ -98,7 +99,7 @@ const i32_t max_fail_time=0;//disable

 const u32_t heartbeat_interval=1000;

-const u32_t timer_interval=500;//this should be smaller than heartbeat_interval and retry interval;
+const u32_t timer_interval=400;//this should be smaller than heartbeat_interval and retry interval;

 //const uint32_t conv_timeout=120000; //120 second
 //const u32_t conv_timeout=120000; //for test
@@ -135,7 +136,7 @@ typedef u64_t anti_replay_seq_t;
 typedef u64_t fd64_t;

 //enum dest_type{none=0,type_fd64_ip_port,type_fd64,type_fd64_ip_port_conv,type_fd64_conv/*,type_fd*/};
-enum dest_type{none=0,type_fd64_ip_port,type_fd64,type_fd,type_fd_ip_port/*,type_fd*/};
+enum dest_type{none=0,type_fd64_ip_port,type_fd64,type_fd,type_write_fd,type_fd_ip_port/*,type_fd*/};

 struct ip_port_t
 {
@@ -176,6 +177,13 @@ struct fd_info_t
 	ip_port_t ip_port;
 };

+struct pseudo_header {
+    u_int32_t source_address;
+    u_int32_t dest_address;
+    u_int8_t placeholder;
+    u_int8_t protocol;
+    u_int16_t tcp_length;
+};

 u64_t get_current_time();
 u64_t get_current_time_us();
@@ -209,6 +217,7 @@ void setnonblocking(int sock);
 int set_buf_size(int fd,int socket_buf_size,int force_socket_buf=0);

 unsigned short csum(const unsigned short *ptr,int nbytes);
+unsigned short tcp_csum(const pseudo_header & ph,const unsigned short *ptr,int nbytes);

 void  signal_handler(int sig);
 int numbers_to_char(id_t id1,id_t id2,id_t id3,char * &data,int &len);
--- a/connection.h
+++ b/connection.h
@@ -107,7 +107,7 @@ struct conn_info_t     //stores info for a raw connection.for client ,there is o
 	fec_encode_manager_t fec_encode_manager;
 	fec_decode_manager_t fec_decode_manager;
 	my_timer_t timer;
-	ip_port_t ip_port;
+	//ip_port_t ip_port;
 	u64_t last_active_time;
 	stat_t stat;
 	conn_info_t()
--- a/doc/README.zh-cn.md
+++ b/doc/README.zh-cn.md
@@ -11,9 +11,21 @@

 ![image0](/images/Capture2.PNG)

-另外，可以和udp2raw串联使用，在加速的同时把UDP伪装成TCP，防止UDP被运营商QOS或屏蔽。udp2raw: https://github.com/wangyu-/udp2raw-tunnel
+对于某些运营商，UDPspeeder跟udp2raw配合可以达到更好的速度，udp2raw负责把UDP伪装成TCP，来绕过运营商的UDP限速。
+
+udp2raw的repo:
+
+https://github.com/wangyu-/udp2raw-tunnel
+
+如果你嫌UDPspeeder+OpenVPN麻烦，你可以尝试tinyFecVPN，一个集成了UDPspeeder功能的VPN：
+
+tinyFecVPN的repo:
+
+https://github.com/wangyu-/tinyFecVPN
+
+
 #### 效果
-![image0](/images/Capture8.PNG)
+![image0](/images/cn/ping_compare_cn.PNG)

 ![image0](/images/cn/scp_compare.PNG)
 #### 原理简介
@@ -39,11 +51,13 @@ client支持多个udp连接，server也支持多个client
 # 简明操作说明

 ### 环境要求
-Linux主机，可以是桌面版，可以是android手机/平板，可以是openwrt路由器，也可以是树莓派。在windows和mac上配合虚拟机可以稳定使用（speeder跑在Linux里，其他应用照常跑在window里，桥接模式测试可用），可以使用[这个](https://github.com/wangyu-/udp2raw-tunnel/releases/download/20170918.0/lede-17.01.2-x86_virtual_machine_image_with_udp2raw_pre_installed.zip)虚拟机镜像，大小只有7.5mb，免去在虚拟机里装系统的麻烦；虚拟机自带ssh server，可以scp拷贝文件，可以ssh进去，可以复制粘贴，root密码123456。
+Linux主机，可以是桌面版，可以是android手机/平板，可以是openwrt路由器，也可以是树莓派。Release中提供了`amd64`、`x86`、`arm`、`mips_be`、`mips_le`的预编译binary.
+
+对于windows和mac用户，在虚拟机中可以稳定使用（speeder跑在Linux里，其他应用照常跑在window里，桥接模式测试可用）。可以使用[这个](https://github.com/wangyu-/udp2raw-tunnel/releases/download/20171108.0/lede-17.01.2-x86_virtual_machine_image.zip)虚拟机镜像，大小只有7.5mb，免去在虚拟机里装系统的麻烦；虚拟机自带ssh server，可以scp拷贝文件，可以ssh进去，可以复制粘贴，root密码123456。

 android版需要通过terminal运行。

-###### 注意
+##### 注意
 在使用虚拟机时，建议手动指定桥接到哪个网卡，不要设置成自动。否则可能会桥接到错误的网卡。

 ### 安装
@@ -55,101 +69,97 @@ https://github.com/wangyu-/UDPspeeder/releases
 假设你有一个server，ip为44.55.66.77，有一个服务监听在udp 7777端口。 假设你需要加速本地到44.55.66.77:7777的流量。
 ```
 在server端运行:
-./speederv2 -s -l0.0.0.0:4096 -r127.0.0.1:7777  -f20:10 -k "passwd"
+./speederv2 -s -l0.0.0.0:4096 -r127.0.0.1:7777  -f20:10 -k "passwd" --mode 0

 在client端运行:
-./speederv2 -c -l0.0.0.0:3333 -r44.55.66.77:4096 -f20:10 -k "passwd"
+./speederv2 -c -l0.0.0.0:3333 -r44.55.66.77:4096 -f20:10 -k "passwd" --mode 0
 ```

 现在client和server之间建立起了tunnel。想要连接44.55.66.77:7777，只需要连接 127.0.0.1:3333。来回的所有的udp流量会被加速。

-###### 备注:
+##### 备注:

-`-f20:10` 表示对每20个原始数据发送10个冗余包。`-f20:10` 和`-f 20:10`都是可以的，空格可以省略，对于所有的单字节option都是如此。对于双字节option，例如后面的`--mode 0`和`--mtu 1200`，空格不可以省略。
+`-f20:10`表示对每20个原始数据发送10个冗余包。`-f20:10` 和`-f 20:10`都是可以的，空格可以省略，对于所有的单字节option都是如此。对于双字节option，例如后面会提到的`--mode 0`，空格不可以省略。

-`-k` 指定一个字符串，server/client间所有收发的包都会被异或，改变协议特征，防止UDPspeeder的协议被运营商针对。
+`-k` 指定一个字符串，开启简单的异或加密

+推荐使用`--mode 0`选项，否则你可能需要考虑MTU问题。

-###### 注意
+##### 注意

-要为UDPspeeder加速的应用设置好MTU(不是在UDPspeeder中，是在被加速的应用中)，建议设置为1200。 
-
-另外，如果被加速的应用不能调整MTU，也可以在UDPspeeder中通过`--mode 0 --mtu 1200`设置MTU。关于`--mode 0`和`--mtu`的具体含义请看下文。
+这里推荐的参数是给日常/非游戏情况下使用的；玩游戏请用 [使用经验](https://github.com/wangyu-/UDPspeeder/wiki/使用经验) 里推荐的参数。

 # 进阶操作说明

 ### 命令选项
 ```
 UDPspeeder V2
-git version:8e7a8aed92    build date:Oct 25 2017 02:00:54
+git version: 6f55b8a2fc    build date: Nov 19 2017 06:11:23
 repository: https://github.com/wangyu-/UDPspeeder

 usage:
-    run as client : ./this_program -c -l local_listen_ip:local_port -r server_ip:server_port  [options]
-    run as server : ./this_program -s -l server_listen_ip:server_port -r remote_ip:remote_port  [options]
+    run as client: ./this_program -c -l local_listen_ip:local_port -r server_ip:server_port  [options]
+    run as server: ./this_program -s -l server_listen_ip:server_port -r remote_ip:remote_port  [options]

-common option,must be same on both sides:
-    -k,--key              <string>        key for simple xor encryption. if not set,xor is disabled
+common options, must be same on both sides:
+    -k,--key              <string>        key for simple xor encryption. if not set, xor is disabled
 main options:
-    -f,--fec              x:y             forward error correction,send y redundant packets for every x packets
-    --timeout             <number>        how long could a packet be held in queue before doing fec,unit: ms,default :8ms
-    --mode                <number>        fec-mode,available values: 0,1 ; 0 cost less bandwidth,1 cost less latency(default)
-    --report              <number>        turn on send/recv report,and set a period for reporting,unit:s
+    -f,--fec              x:y             forward error correction, send y redundant packets for every x packets
+    --timeout             <number>        how long could a packet be held in queue before doing fec, unit: ms, default: 8ms
+    --report              <number>        turn on send/recv report, and set a period for reporting, unit: s
 advanced options:
-    --mtu                 <number>        mtu. for mode 0,the program will split packet to segment smaller than mtu_value.
-                                          for mode 1,no packet will be split,the program just check if the mtu is exceed.
-                                          default value:1250
-    -j,--jitter           <number>        simulated jitter.randomly delay first packet for 0~<number> ms,default value:0.
+    --mode                <number>        fec-mode,available values: 0,1; mode 0(default) costs less bandwidth,no mtu problem.
+                                          mode 1 usually introduces less latency, but you have to care about mtu.
+    --mtu                 <number>        mtu. for mode 0, the program will split packet to segment smaller than mtu value.
+                                          for mode 1, no packet will be split, the program just check if the mtu is exceed.
+                                          default value: 1250. you typically shouldnt change this value.
+    -q,--queue-len        <number>        fec queue len, only for mode 0, fec will be performed immediately after queue is full.
+                                          default value: 200. 
+    -j,--jitter           <number>        simulated jitter. randomly delay first packet for 0~<number> ms, default value: 0.
                                          do not use if you dont know what it means.
-    -i,--interval         <number>        scatter each fec group to a interval of <number> ms,to protect burst packet loss.
-                                          default value:0.do not use if you dont know what it means.
-    --random-drop         <number>        simulate packet loss ,unit:0.01%. default value: 0
-    --disable-obscure     <number>        disable obscure,to save a bit bandwidth and cpu
+    -i,--interval         <number>        scatter each fec group to a interval of <number> ms, to protect burst packet loss.
+                                          default value: 0. do not use if you dont know what it means.
+    --random-drop         <number>        simulate packet loss, unit: 0.01%. default value: 0.
+    --disable-obscure     <number>        disable obscure, to save a bit bandwidth and cpu.
 developer options:
-    --fifo                <string>        use a fifo(named pipe) for sending commands to the running program,so that you
-                                          can change fec encode parameters dynamically,check readme.md in repository for
+    --fifo                <string>        use a fifo(named pipe) for sending commands to the running program, so that you
+                                          can change fec encode parameters dynamically, check readme.md in repository for
                                          supported commands.
-    -j ,--jitter          jmin:jmax       similiar to -j above,but create jitter randomly between jmin and jmax
-    -i,--interval         imin:imax       similiar to -i above,but scatter randomly between imin and imax
-    -q,--queue-len        <number>        max fec queue len,only for mode 0
-    --decode-buf          <number>        size of buffer of fec decoder,unit:packet,default:2000
-    --fix-latency         <number>        try to stabilize latency,only for mode 0
+    -j ,--jitter          jmin:jmax       similiar to -j above, but create jitter randomly between jmin and jmax
+    -i,--interval         imin:imax       similiar to -i above, but scatter randomly between imin and imax
+    --decode-buf          <number>        size of buffer of fec decoder,u nit: packet, default: 2000
+    --fix-latency         <number>        try to stabilize latency, only for mode 0
    --delay-capacity      <number>        max number of delayed packets
-    --disable-fec         <number>        completely disable fec,turn the program into a normal udp tunnel
-    --sock-buf            <number>        buf size for socket,>=10 and <=10240,unit:kbyte,default:1024
+    --disable-fec         <number>        completely disable fec, turn the program into a normal udp tunnel
+    --sock-buf            <number>        buf size for socket, >=10 and <=10240, unit: kbyte, default: 1024
 log and help options:
-    --log-level           <number>        0:never    1:fatal   2:error   3:warn
-                                          4:info (default)     5:debug   6:trace
-    --log-position                        enable file name,function name,line number in log
+    --log-level           <number>        0: never    1: fatal   2: error   3: warn 
+                                          4: info (default)      5: debug   6: trace
+    --log-position                        enable file name, function name, line number in log
    --disable-color                       disable log color
    -h,--help                             print this help message

+
+
 ```
 ### 包发送选项，两端设置可以不同。 只影响本地包发送。
 ##### `-f` 选项
 设置fec参数，影响数据的冗余度。
 ##### `--timeout` 选项
-指定fec编码器在编码时候最多可以引入多大的延迟。越高fec越有效率，加速游戏时调低可以降低延迟。
-
+指定fec编码器在编码时候最多可以引入多大的延迟。越高fec越有效率，调低可以降低延迟，但是会牺牲效率。
 #####  `--mode` 选项 和 `--mtu`选项
-fec编码器的工作模式。对于mode 0，编码器会积攒一定数量的packet，然后把他们合并再切成等长的片段（切分长度由--mtu指定）。对于mode 1，编码器不会做任何切分，而是会把packet按最大长度对齐，fec冗余包的长度为对齐后的长度（最大长度）。

-mode 0更省流量，在丢包率正常的情况下效果和mode 1是一样的；mode 1延迟更低，在极高丢包的情况下表现更好。
+简单来说`--mode 0`更省流量，没有mtu问题；`--mode 1`可以稍微降低一点延迟，需要考虑mtu；另外还有个`--mode 0 -q1`模式，多倍发包专用，没有延迟，也没有mtu问题，适合游戏，但是最耗流量。

-mode 0使用起来可以不用关注mtu，因为fec编码器会帮你把包切分到合理的大小；用mode 1时必须合理设置上层应用的mtu。mode 0模式中--mtu选项决定切分的片段的长度，mode 1模式中--mtu选项只起检查作用，如果超过了--mtu指定的值，数据包会被丢弃。
+具体见，https://github.com/wangyu-/UDPspeeder/wiki/mode和mtu选项

-mode 0模式的流量消耗基本完全透明。mode 1因为涉及到数据按最大长度对齐，所以流量消耗不是完全可预期。不过就实际使用来看，mode 1消耗的额外流量不多。
-
-mode 0模式数据包一般不会乱序，除非网络本身有严重乱序；mode 1模式被恢复的数据包可能会乱序，不过UDP本来就允许乱序，对绝大多数应用没有影响。mode 0模式反而可以纠正一些乱序情况。
-
-mode 0模式允许你发送的数据包大小超过物理接口的MTU而几乎不引起性能损失（而普通的ip分片做不到这点），目前最高支持到2000字节，2000字节已经可以应对任何应用了，因为一般网络的MTU只有1400多。之所以支持到2000字节是为了省程序内部开的静态buff(静态buff避免malloc提高性能)，如果你是开发者，通过重新编译，支持到UDP协议的极限(
-65507字节)也没问题。
+对于新手，建议不要纠结这些参数的具体含义，就用我在`使用经验`里推荐的设置，不要乱改参数，尤其是不要改`--mtu`。

 ##### `--report`  选项
-数据发送和接受报告。开启后可以根据此数据推测出包速和丢包率等特征。
+数据发送和接受报告。开启后可以根据此数据推测出包速和丢包率等特征。`--report 10`表示每10秒生成一次报告。

 ##### `-i` 选项
-指定一个时间窗口，长度为n毫秒。同一个fec分组的数据在发送时候会被均匀分散到这n毫秒中。可以对抗突发性的丢包。默认值是0，因为这个功能需要用到时钟，在某些虚拟机里时钟不稳定，可能会导致个别包出现非常大的延迟，所以默认关掉了。这个功能很有用，默认参数效果不理想时可以尝试打开。这个选项的跟通信原理上常说的`交错fec` `交织fec`的原理是差不多的。
+指定一个时间窗口，长度为n毫秒。同一个fec分组的数据在发送时候会被均匀分散到这n毫秒中。可以对抗突发性的丢包。默认值是0，因为这个功能需要用到时钟，在某些虚拟机里时钟不稳定，可能会导致个别包出现非常大的延迟，所以默认关掉了。这个功能很有用，默认参数效果不理想时可以尝试打开，比如用`-i 10`。这个选项的跟通信原理上常说的`交错fec` `交织fec`的原理是差不多的。

 ##### `-j` 选项
 为原始数据的发送，增加一个延迟抖动值。这样上层应用计算出来的RTT方差会更大，以等待后续冗余包的到达，不至于发生在冗余包到达之前就触发重传的尴尬。配合-t选项使用。正常情况下跨国网络本身的延迟抖动就很大，可以不用设-j。这个功能也需要时钟，默认关掉了，不过一般情况应该不需要这个功能。
@@ -159,14 +169,15 @@ mode 0模式允许你发送的数据包大小超过物理接口的MTU而几乎
 ##### `--random-drop` 选项
 随机丢包。模拟高丢包的网络环境时使用。 `--random-drop`和`-j`选项一起用，可以模拟高延迟（或者高延迟抖动）高丢包的网络，可用于测试FEC参数在各种网络环境下的表现。

-##### `-k`选项
-指定一个字符串，server/client间所有收发的包都会被异或，改变协议特征，防止UDPspeeder的协议被运营商针对。
+##### `-q` 选项
+仅对mode 0模式有用。设置fec编码器的最大队列长度。 比如`-q5`的意思是，在编码器积攒了5个数据包后，就立即发送。合理使用可以改善延迟。在下文的`使用经验`里有提到用`--mode 0 -q1` 来多倍发包。 

-##### `--disable-obscure`
-UDPspeeder默认情况下会对每个发出的数据包随机填充和异或一些字节(4~32字节)，这样通过抓包难以发现你发了冗余数据，防止VPS被封。这个功能只是为了小心谨慎，即使你关掉这个功能，基本上也没问题，关掉可以省一些带宽和CPU。
+`-q`和 `--timeout`的作用类似。`-q`决定fec编码器积攒了多少个数据包之后，立即发送。`--timeout`决定编码器收到第一个数据包以后，最多延迟多少毫秒后发送。
+
+默认值是200，也就是尽可能多得积攒数据。 
+
+建议不要自己调整这个参数，除非是用我在`使用经验`里推荐给你的形式。

-##### `-q,--queue-len`
-编码器在做FEC前最多积攒多少个数据包，只对mode 0有效。除非是使用下文`V2版如何多倍发包`里面提到的用法，不建议改动。
 #### `--fifo` option
 用fifo(命名管道)向运行中的程序发送command。例如`--fifo fifo.file`，可用的command有：
 ```
@@ -178,89 +189,35 @@ echo mode 0 > fifo.file
 ```
 可以动态改变fec编码器参数。可以从程序的log里看到command是否发送成功。

+### 以下设置两端必须相同。 
+
+##### `-k`选项
+指定一个字符串，server/client间所有收发的包都会被异或，改变协议特征，防止UDPspeeder的协议被运营商针对。
+
+##### `--disable-obscure`
+UDPspeeder默认情况下会对每个发出的数据包随机填充和异或一些字节(4~32字节)，这样通过抓包难以发现你发了冗余数据，防止VPS被封。这个功能只是为了小心谨慎，即使你关掉这个功能，基本上也没问题，关掉可以省一些带宽和CPU。`--disable-obscure`可以关掉这个功能。
+
 # 使用经验

-### 在FEC和多倍发包之间如何选择
-
-对于游戏，游戏的流量本身不大，延迟很重要，多倍发包是最佳解决方案，多倍发包不会引入额外的延迟。FEC编码器需要先积攒一些数据，才可以做FEC，延迟无法避免；对于多倍发包，没有这个问题，所以没有延迟。
-
-对于其他日常应用（延迟要求一般），在合理配置的情况下，FEC的效果肯定好过多倍发包。不过需要根据网络的最大丢包来配置FEC参数，才能有稳定的效果。如果配置不当，对于--mode 1可能会完全没有效果；对于--mode 0，可能效果会比不用UDPspeeder还差。
-
-对于游戏以外的应用，推荐使用FEC。但是，如果FEC版的默认参数在你那边效果很差，而你又不会调，可以先用多倍发包。
-
-### V2版如何多倍发包
-
-只要在设置-f参数时把x设置为1，fec算法就退化为多倍发包了。例如-f1:1，表示2倍发包，-f1:2表示3倍发包，以此类推。另外可以加上`--mode 0 -q1`参数，防止fec编码器试图积攒和合并数据，获得最低的延迟。
-
-2倍发包的完整参数：
-
-```
-./speederv2 -s -l0.0.0.0:4096 -r127.0.0.1:7777  -f1:1 -k "passwd" --mode 0 -q1
-./speederv2 -c -l0.0.0.0:3333 -r44.55.66.77:4096 -f1:1 -k "passwd" --mode 0 -q1
-```
-
-使用了`--mode 0 -q1`以后，`--timeout`选项不起作用，所以不用调。
-
-如果你只需要多倍发包，可以直接用回V1版，V1版配置更简单，占用内存更小，而且经过了几个月的考验，很稳定。
-
-### 根据网络丢包合理设置FEC参数
-
-默认的FEC参数为-f20:10，对每20个包，额外发送10个冗余包，也就是1.5倍发包。已经可以适应绝大多数的网络情况了，对于10%的网络丢包，可以降低到0.01%以下；对于20%的网络丢包，可以降低到2.5%。
-
-如果你的网络丢包很低，比如在3%以下，可以尝试调低参数。比如-f20:5，也就是1.2倍发包，这个参数已经足够把3%的丢包降低到0.01%以下了。
-
-如果网络丢包超过20%，需要把-f20:10调大。
-
-如果你实在不会配，那么也可以用回V1版。
-
-### 根据CPU处理能力来调整FEC参数
-
-FEC算法很吃CPU，初次使用建议关注UDPspeeder的CPU占用。如果CPU被打满，可以在冗余度不变的情况下把FEC分组大小调小，否则的话效果可能很差。
-
-比如-f20:10和-f10:5，都是1.5倍的冗余度，而-f20:10的FEC分组大小是30个包，-f10:5的FEC分组大小是15个包。-f20:10更费CPU，但是在一般情况下效果更稳定。把分组调小可以节省CPU。
-
-另外，fec分组大小不宜过大，否则不但很耗CPU，还有其他副作用，建议x+y<50。
-
-### 改变FEC参数而不断线
-
-`--fifo`选项可以在运行时改变FEC参数，无需重启程序，也不会断线。如果你在使用过程中发现网络丢包突然变高，可以动态地把冗余度调大；反之也一样，如果网络变好了，把冗余度调小节省流量。一切都是无缝进行，不会断线，也不会因为改FEC参数导致额外的丢包。
-
-### 为什么使用之后效果反而变差了？
-
-有可能是你用了mode 0参数，而又没调好参数。
-
-如果你没有使用mode 0，而确实效果变差了，那很可能是因为你的运营商对UDP有限制。一般看视频和下载都是TCP流量，而用UDPspeeder中转后流量变成了UDP流量，如果运营商对UDP做了限制，就可能导致效果比不用还差。用udp2raw可以解决，udp2raw: https://github.com/wangyu-/udp2raw-tunnel
-
-
-### UDPspeeder和BBR/锐速配合
-
-UDPspeeder和BBR/锐速可以配合使用，UDPspeeder工作在IP层负责降低丢包率，BBR/锐速工作在TCP层负责优化拥塞和重传。这种情况下，可以调低UDPspeeder的冗余度，能把丢包率降低到5%以内就可以了，剩下的交给BBR/锐速解决，这样预计可以节省一些流量。如果是UDPspeeder跟Linux默认的Cubic一起用，最少也要把丢包率降低到1%以下才能流畅使用TCP。
-
-对下文的`UDPspeeder + openvpn`和`UDPspeeder + openvpn + $***`方法有效。不过有一点区别，具体见下文。
-
-### UDPspeeder和Kcptun配合
-
-UDPspeeder和Kcptun配合，UDPspeeder和Kcptun可以并联也可以串联。
-
-并联的情况下，让kcptun负责加速TCP，UDPspeeder负责加速UDP。见下文的`UDPspeeder + kcptun + $*** 同时加速tcp和udp流量`。
-
-串联的情况。UDPspeeder的FEC跟Kcptun自带的相比：可以对两个方向设置不同的FEC参数、有一个更省流量的mode 0模式、可以动态改变FEC参数；但是UDPspeeder本身不优化拥塞和重传算法。所以UDPspeeder和Kcptun也可以配合使用，结合两者的优点。
-
-串联时可以关掉Kcptun的FEC，让UDPspeeder接管FEC功能。这样UDPspeeder工作在UDP层负责降低丢包率，Kcptun工作在应用层用kcp算法负责优化拥塞和重传，能起到和`UDPspeeder+BBR/锐速`类似的效果。
-
-如果发Issue问Kcptun+UDPspeeder相关的问题，一定要说明是并联还是串联。
+https://github.com/wangyu-/UDPspeeder/wiki/使用经验

 # 应用

 #### UDPspeeder + OpenVPN加速任何流量，也适用于其他VPN
 ![image0](/images/Capture2.PNG)

-具体配置见，[UDPspeeder + openvpn config guide](/doc/udpspeeder_openvpn.md).
-
-可以和BBR/锐速叠加，不过BBR/锐速部署在VPS上只对从本地到VPS的流量有效，对从本地到第三方服务器的流量无效。
+可以和BBR/锐速叠加，不过BBR/锐速部署在VPS上只对本地和VPS间的流量有效，对从本地和第三方服务器间的流量无效。

 需要在服务端开启ipforward和NAT。在客户端改路由表（可以手动修改，也可以由OpenVPN的redirect-gateway选项自动加好）。

+Linux具体配置: [UDPspeeder + openvpn config guide](/doc/udpspeeder_openvpn.md).
+
+Windows具体配置: [win10系统UDPspeeder+OpenVPN的完整设置](https://github.com/wangyu-/UDPspeeder/wiki/win10系统UDPspeeder-OpenVPN的完整设置)
+
+如果UDPspeeder + OpenVPN对你来说显得太麻烦了，你可以尝试一下tinyFecVPN,一个集成了UDPspeeder功能的VPN:
+
+https://github.com/wangyu-/tinyFecVPN/
+
 #### UDPspeeder + kcptun/finalspeed + $*** 同时加速tcp和udp流量
 如果你需要用加速的tcp看视频和下载文件，这样效果可能比没有BBR的UDPspeeder+vpn方案更好。另外，如果你需要玩游戏，但是嫌配VPN麻烦，也可以用这种方案。
 ![image0](/images/cn/speeder_kcptun.PNG)
@@ -281,9 +238,11 @@ run at client side:

 这就是全部的命令了。issue里有很多人困惑于怎么把tcp和udp流量"分开"，其实很简单就可以做到。

-如果只需要加速UDP，不需要加速TCP，可以把kcptun换成其他的任意端口转发方式，比如ncat/socat/ssh tunnel/iptables。
+如果只需要加速UDP，不需要加速TCP，可以把kcptun换成其他的任意端口转发方式，比如ncat/socat/ssh tunnel/iptables/[tinyPortMapper](https://github.com/wangyu-/tinyPortMapper/releases)。

-另外，如果没有kcptun只有BBR/锐速的话，也可以把kcptun换成ncat/socat/ssh tunnel/iptables。这样，TCP流量由锐速/BBR加速，UDP由UDPspeeder加速。
+如果你没有kcptun只有BBR/锐速的话，也可以把kcptun换成ncat/socat/ssh tunnel/iptables/[tinyPortMapper](https://github.com/wangyu-/tinyPortMapper/releases)。这样，TCP流量由锐速/BBR加速，UDP由UDPspeeder加速。
+
+另外，即使你不想使用$\*\*\*的TCP功能，你也必须把$\*\*\*的TCP端口转发过来，否则无法使用UDP功能，这是socks5协议的工作方式决定的。($\*\*\*-redir方式不受此限制)

 #### UDPspeeder + openvpn + $*** 混合方案，也适用于其他VPN
 也是我正在用的方案。优点是可以随时在vpn和$\*\*\*方案间快速切换。
@@ -295,7 +254,32 @@ run at client side:

 可以和BBR/锐速叠加，BBR/锐速只要部署在VPS上就有效。

+也可以用[tinyFecVPN](https://github.com/wangyu-/tinyFecVPN/) + $\*\*\* ，配置起来更简单。
+
+# 应用实例
+
+#### win10系统UDPspeeder+OpenVPN的完整设置
+
+https://github.com/wangyu-/UDPspeeder/wiki/win10系统UDPspeeder-OpenVPN的完整设置
+
+
+#### UDPspeeder+OpenVPN运行在linux上，透明加速linux本机的网络
+
+https://github.com/wangyu-/tinyFecVPN/wiki/tinyFecVPN运行在linux上，透明加速linux本机的网络
+
+
+#### UDPspeeder+OpenVPN运行在虚拟机中，加速windows和局域网内其他主机的网络
+
+https://github.com/wangyu-/tinyFecVPN/wiki/tinyFecVPN运行在虚拟机中，加速windows和局域网内其他主机的网络
+
+
+
+#### 用树莓派做路由器，搭建透明代理，加速游戏主机的网络
+
+https://github.com/wangyu-/UDPspeeder/wiki/用树莓派做路由器，搭建透明代理，加速游戏主机的网络
+
 # 编译教程
 暂时先参考udp2raw的这篇教程，几乎一样的过程。

 https://github.com/wangyu-/udp2raw-tunnel/blob/master/doc/build_guide.zh-cn.md
+
--- a/doc/udpspeeder_openvpn.md
+++ b/doc/udpspeeder_openvpn.md
@@ -100,3 +100,8 @@ or
 ip route add 44.55.66.77 dev XXX
 ```
 (run at client side)
+
+##### Other Info
+You can also use tinyFecVPN,a lightweight VPN with build-in FEC support:
+
+https://github.com/wangyu-/tinyFecVPN
--- a/fec_manager.cpp
+++ b/fec_manager.cpp
@@ -16,7 +16,7 @@ int g_fec_redundant_num=10;
 int g_fec_mtu=1250;
 int g_fec_queue_len=200;
 int g_fec_timeout=8*1000; //8ms
-int g_fec_mode=1;
+int g_fec_mode=0;

 int dynamic_update_fec=1;

@@ -146,11 +146,11 @@ fec_encode_manager_t::fec_encode_manager_t()
 	}
 	timer_fd64=fd_manager.create(timer_fd);

-	re_init(fec_data_num,fec_redundant_num,fec_mtu,fec_queue_len,fec_timeout,fec_mode);
+	reset_fec_parameter(g_fec_data_num,g_fec_redundant_num,g_fec_mtu,g_fec_queue_len,g_fec_timeout,g_fec_mode);
+

-	seq=(u32_t)get_true_random_number(); //TODO temp solution for a bug.
 }
-int fec_encode_manager_t::re_init(int data_num,int redundant_num,int mtu,int queue_len,int timeout,int mode)
+int fec_encode_manager_t::reset_fec_parameter(int data_num,int redundant_num,int mtu,int queue_len,int timeout,int mode)
 {
 	fec_data_num=data_num;
 	fec_redundant_num=redundant_num;
@@ -160,15 +160,8 @@ int fec_encode_manager_t::re_init(int data_num,int redundant_num,int mtu,int que
 	fec_mode=mode;

 	assert(data_num+redundant_num<max_fec_packet_num);
-	counter=0;
-	blob_encode.clear();
-	ready_for_output=0;
-	//seq=0;

-	itimerspec zero_its;
-	memset(&zero_its, 0, sizeof(zero_its));
-
-	timerfd_settime(timer_fd, TFD_TIMER_ABSTIME, &zero_its, 0);
+	clear();

 	return 0;
 }
@@ -192,7 +185,7 @@ int fec_encode_manager_t::append(char *s,int len/*,int &is_first_packet*/)
 	{
 		mylog(log_trace,"counter=%d\n",counter);
 		assert(len<=65535&&len>=0);
-		assert(len<=fec_mtu);
+		//assert(len<=fec_mtu);//relax this limitation
 		char * p=input_buf[counter]+sizeof(u32_t)+4*sizeof(char);//copy directly to final position,avoid unnecessary copy.
 		//remember to change this,if protocol is modified

@@ -225,15 +218,19 @@ int fec_encode_manager_t::input(char *s,int len/*,int &is_first_packet*/)
 	//int counter_back=counter;
 	assert(fec_mode==0||fec_mode==1);

-	if(fec_mode==0&& s!=0 &&counter==0&&blob_encode.get_shard_len(fec_data_num,len)>=fec_mtu)
+	if(fec_mode==0&& s!=0 &&counter==0)
 	{
-		mylog(log_warn,"message too long len=%d,ignored\n",len);
-		return -1;
+		int out_len=blob_encode.get_shard_len(fec_data_num,len);
+		if(out_len>fec_mtu)
+		{
+			mylog(log_warn,"message too long ori_len=%d out_len=%d fec_mtu=%d,ignored\n",len,out_len,fec_mtu);
+			return -1;
+		}
 	}
-	if(fec_mode==1&&s!=0&&len>=fec_mtu)
+	if(fec_mode==1&&s!=0&&len>fec_mtu)
 	{
-		mylog(log_warn,"message too long len=%d fec_mtu=%d,ignored\n",len,fec_mtu);
-		return -1;
+		mylog(log_warn,"mode==1,message len=%d,len>fec_mtu,fec_mtu=%d,packet may not be delivered\n",len,fec_mtu);
+		//return -1;
 	}
 	if(s==0&&counter==0)
 	{
@@ -242,7 +239,7 @@ int fec_encode_manager_t::input(char *s,int len/*,int &is_first_packet*/)
 	}
 	if(s==0) about_to_fec=1;//now

-	if(fec_mode==0&& blob_encode.get_shard_len(fec_data_num,len)>=fec_mtu) {about_to_fec=1; delayed_append=1;}//fec then add packet
+	if(fec_mode==0&& blob_encode.get_shard_len(fec_data_num,len)>fec_mtu) {about_to_fec=1; delayed_append=1;}//fec then add packet

 	if(fec_mode==0) assert(counter<fec_queue_len);//counter will never equal fec_pending_num,if that happens fec should already been done.
 	if(fec_mode==1) assert(counter<fec_data_num);
@@ -285,7 +282,10 @@ int fec_encode_manager_t::input(char *s,int len/*,int &is_first_packet*/)
    			int best_data_num=fec_data_num;
    			for(int i=1;i<actual_data_num;i++)
    			{
-    				u32_t new_len=(blob_encode.get_shard_len(i,0)+header_overhead)*(i+fec_redundant_num);
+    				u32_t shard_len=blob_encode.get_shard_len(i,0);
+    				if(shard_len>(u32_t)fec_mtu) continue;
+
+    				u32_t new_len=(shard_len+header_overhead)*(i+fec_redundant_num);
    				if(new_len<best_len)
    				{
    					best_len=new_len;
@@ -489,15 +489,12 @@ int fec_encode_manager_t::output(int &n,char ** &s_arr,int *&len)
 	}
 	return 0;
 }
-
+/*
 int fec_decode_manager_t::re_init()
 {
-	for(int i=0;i<(int)fec_buff_num;i++)
-		fec_data[i].used=0;
-	ready_for_output=0;
-	index=0;
+	clear();
 	return 0;
-}
+}*/

 int fec_decode_manager_t::input(char *s,int len)
 {
--- a/fec_manager.h
+++ b/fec_manager.h
@@ -37,10 +37,16 @@ struct anti_replay_t
 	unordered_set<u32_t> st;
 	int index;
 	anti_replay_t()
+	{
+		clear();
+	}
+	int clear()
 	{
 		memset(replay_buffer,-1,sizeof(replay_buffer));
+		st.clear();
 		st.rehash(anti_replay_buff_size*3);
 		index=0;
+		return 0;
 	}
 	void set_invaild(u32_t seq)
 	{
@@ -140,6 +146,22 @@ public:
 	fec_encode_manager_t();
 	~fec_encode_manager_t();

+	int clear()
+	{
+		counter=0;
+		blob_encode.clear();
+		ready_for_output=0;
+
+		itimerspec zero_its;
+		memset(&zero_its, 0, sizeof(zero_its));
+
+		timerfd_settime(timer_fd, TFD_TIMER_ABSTIME, &zero_its, 0);
+
+		seq=(u32_t)get_true_random_number(); //TODO temp solution for a bug.
+
+		return 0;
+	}
+
 	my_time_t get_first_packet_time()
 	{
 		return first_packet_time_for_output;
@@ -155,7 +177,7 @@ public:
 		return fec_mode;
 	}
 	u64_t get_timer_fd64();
-	int re_init(int data_num,int redundant_num,int mtu,int pending_num,int pending_time,int type);
+	int reset_fec_parameter(int data_num,int redundant_num,int mtu,int pending_num,int pending_time,int type);
 	int input(char *s,int len/*,int &is_first_packet*/);
 	int output(int &n,char ** &s_arr,int *&len);
 };
@@ -200,7 +222,7 @@ public:
 	fec_decode_manager_t()
 	{
 		fec_data=new fec_data_t[fec_buff_num+5];
-		re_init();
+		clear();
 	}
 	fec_decode_manager_t(const fec_decode_manager_t &b)
 	{
@@ -210,7 +232,21 @@ public:
 	{
 		delete fec_data;
 	}
-	int re_init();
+	int clear()
+	{
+		anti_replay.clear();
+		mp.clear();
+		mp.rehash(fec_buff_num*3);
+
+		for(int i=0;i<(int)fec_buff_num;i++)
+			fec_data[i].used=0;
+		ready_for_output=0;
+		index=0;
+
+		return 0;
+	}
+
+	//int re_init();
 	int input(char *s,int len);
 	int output(int &n,char ** &s_arr,int* &len_arr);
 };
--- a/images/cn/ping_compare_cn.PNG
+++ b/images/cn/ping_compare_cn.PNG
--- a/main.cpp
+++ b/main.cpp
@@ -9,10 +9,72 @@
 #include "fec_manager.h"
 #include "misc.h"
 #include "tunnel.h"
-#include "tun_dev.h"
+//#include "tun_dev.h"
+#include "git_version.h"
 using namespace std;


+static void print_help()
+{
+	char git_version_buf[100]={0};
+	strncpy(git_version_buf,gitversion,10);
+
+	printf("UDPspeeder V2\n");
+	printf("git version: %s    ",git_version_buf);
+	printf("build date: %s %s\n",__DATE__,__TIME__);
+	printf("repository: https://github.com/wangyu-/UDPspeeder\n");
+	printf("\n");
+	printf("usage:\n");
+	printf("    run as client: ./this_program -c -l local_listen_ip:local_port -r server_ip:server_port  [options]\n");
+	printf("    run as server: ./this_program -s -l server_listen_ip:server_port -r remote_ip:remote_port  [options]\n");
+	printf("\n");
+	printf("common options, must be same on both sides:\n");
+	printf("    -k,--key              <string>        key for simple xor encryption. if not set, xor is disabled\n");
+
+	printf("main options:\n");
+	printf("    -f,--fec              x:y             forward error correction, send y redundant packets for every x packets\n");
+	printf("    --timeout             <number>        how long could a packet be held in queue before doing fec, unit: ms, default: 8ms\n");
+	printf("    --report              <number>        turn on send/recv report, and set a period for reporting, unit: s\n");
+
+	printf("advanced options:\n");
+	printf("    --mode                <number>        fec-mode,available values: 0,1; mode 0(default) costs less bandwidth,no mtu problem.\n");
+	printf("                                          mode 1 usually introduces less latency, but you have to care about mtu.\n");
+	printf("    --mtu                 <number>        mtu. for mode 0, the program will split packet to segment smaller than mtu value.\n");
+	printf("                                          for mode 1, no packet will be split, the program just check if the mtu is exceed.\n");
+	printf("                                          default value: 1250. you typically shouldnt change this value.\n");
+    printf("    -q,--queue-len        <number>        fec queue len, only for mode 0, fec will be performed immediately after queue is full.\n");
+	printf("                                          default value: 200. \n");
+	printf("    -j,--jitter           <number>        simulated jitter. randomly delay first packet for 0~<number> ms, default value: 0.\n");
+	printf("                                          do not use if you dont know what it means.\n");
+	printf("    -i,--interval         <number>        scatter each fec group to a interval of <number> ms, to protect burst packet loss.\n");
+	printf("                                          default value: 0. do not use if you dont know what it means.\n");
+	printf("    --random-drop         <number>        simulate packet loss, unit: 0.01%%. default value: 0.\n");
+	printf("    --disable-obscure     <number>        disable obscure, to save a bit bandwidth and cpu.\n");
+//	printf("    --disable-xor         <number>        disable xor\n");
+
+	printf("developer options:\n");
+	printf("    --fifo                <string>        use a fifo(named pipe) for sending commands to the running program, so that you\n");
+	printf("                                          can change fec encode parameters dynamically, check readme.md in repository for\n");
+	printf("                                          supported commands.\n");
+	printf("    -j ,--jitter          jmin:jmax       similiar to -j above, but create jitter randomly between jmin and jmax\n");
+	printf("    -i,--interval         imin:imax       similiar to -i above, but scatter randomly between imin and imax\n");
+    printf("    --decode-buf          <number>        size of buffer of fec decoder,u nit: packet, default: 2000\n");
+    printf("    --fix-latency         <number>        try to stabilize latency, only for mode 0\n");
+    printf("    --delay-capacity      <number>        max number of delayed packets\n");
+	printf("    --disable-fec         <number>        completely disable fec, turn the program into a normal udp tunnel\n");
+	printf("    --sock-buf            <number>        buf size for socket, >=10 and <=10240, unit: kbyte, default: 1024\n");
+	printf("log and help options:\n");
+	printf("    --log-level           <number>        0: never    1: fatal   2: error   3: warn \n");
+	printf("                                          4: info (default)      5: debug   6: trace\n");
+	printf("    --log-position                        enable file name, function name, line number in log\n");
+	printf("    --disable-color                       disable log color\n");
+	printf("    -h,--help                             print this help message\n");
+
+	//printf("common options,these options must be same on both side\n");
+}
+
+
+
 int main(int argc, char *argv[])
 {
 	//working_mode=tunnel_mode;
@@ -25,33 +87,41 @@ int main(int argc, char *argv[])
 	assert(sizeof(i16_t)==2);
 	dup2(1, 2);		//redirect stderr to stdout
 	int i, j, k;
+
+	if (argc == 1)
+	{
+		print_help();
+		myexit( -1);
+	}
+	for (i = 0; i < argc; i++)
+	{
+		if(strcmp(argv[i],"-h")==0||strcmp(argv[i],"--help")==0)
+		{
+			print_help();
+			myexit(0);
+		}
+	}
+
+
 	process_arg(argc,argv);

 	delay_manager.set_capacity(delay_capacity);
 	local_ip_uint32=inet_addr(local_ip);
 	remote_ip_uint32=inet_addr(remote_ip);
+	sub_net_uint32=inet_addr(sub_net);

-	if(working_mode==tunnel_mode)
+	if(strlen(tun_dev)==0)
 	{
-		if(client_or_server==client_mode)
-		{
-			tunnel_client_event_loop();
-		}
-		else
-		{
-			tunnel_server_event_loop();
-		}
+		sprintf(tun_dev,"tun%u",get_true_random_number()%1000);
+	}
+
+	if(client_or_server==client_mode)
+	{
+		tunnel_client_event_loop();
 	}
 	else
 	{
-		if(client_or_server==client_mode)
-		{
-			tun_dev_client_event_loop();
-		}
-		else
-		{
-			tun_dev_server_event_loop();
-		}
+		tunnel_server_event_loop();
 	}

 	return 0;
--- a/5
+++ b/5
@@ -8,12 +8,12 @@ cc_arm= /toolchains/arm-2014.05/bin/arm-none-linux-gnueabi-g++
 #cc_bcm2708=/home/wangyu/raspberry/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-g++ 
 FLAGS= -std=c++11   -Wall -Wextra -Wno-unused-variable -Wno-unused-parameter -Wno-missing-field-initializers -ggdb

-SOURCES=main.cpp log.cpp common.cpp lib/fec.c lib/rs.c packet.cpp delay_manager.cpp fd_manager.cpp connection.cpp fec_manager.cpp tun_dev.cpp misc.cpp tunnel.cpp
+SOURCES=main.cpp log.cpp common.cpp lib/fec.c lib/rs.c packet.cpp delay_manager.cpp fd_manager.cpp connection.cpp fec_manager.cpp misc.cpp tunnel.cpp

 NAME=speederv2
 TARGETS=amd64 arm mips24kc_be x86  mips24kc_le

-TAR=${NAME}_binaries.tar.gz `echo ${TARGETS}|sed -r 's/([^ ]+)/speederv2_\1/g'`
+TAR=${NAME}_binaries.tar.gz `echo ${TARGETS}|sed -r 's/([^ ]+)/speederv2_\1/g'` version.txt

 all:git_version
 	rm -f ${NAME}
@@ -56,6 +56,7 @@ cross3:git_version
 	${cc_cross}   -o ${NAME}_cross    -I. ${SOURCES} ${FLAGS} -lrt -static -O3

 release: ${TARGETS} 
+	cp git_version.h version.txt
 	tar -zcvf ${TAR}

 clean:	
--- a/misc.cpp
+++ b/misc.cpp
@@ -15,6 +15,7 @@ int mtu_warn=1350;

 int disable_mtu_warn=1;
 int disable_fec=0;
+int disable_checksum=0;

 int debug_force_flush_fec=0;

@@ -40,8 +41,17 @@ int time_mono_test=0;
 int delay_capacity=0;


+char sub_net[100]="10.22.22.0";
+u32_t sub_net_uint32=0;
+
+char tun_dev[100]="";


+int keep_reconnect=0;
+
+int tun_mtu=1500;
+
+int mssfix=1;


 int from_normal_to_fec(conn_info_t & conn_info,char *data,int len,int & out_n,char **&out_arr,int *&out_len,my_time_t *&out_delay)
@@ -55,13 +65,17 @@ int from_normal_to_fec(conn_info_t & conn_info,char *data,int len,int & out_n,ch
 	inner_stat_t &inner_stat=conn_info.stat.normal_to_fec;
 	if(disable_fec)
 	{
-		assert(data!=0);
+		if(data==0)
+		{
+			out_n=0;
+			return 0;
+		}
+		//assert(data!=0);
 		inner_stat.input_packet_num++;
 		inner_stat.input_packet_size+=len;
 		inner_stat.output_packet_num++;
 		inner_stat.output_packet_size+=len;

-		if(data==0) return 0;
 		out_n=1;
 		static char *data_static;
 		data_static=data;
@@ -166,7 +180,11 @@ int from_fec_to_normal(conn_info_t & conn_info,char *data,int len,int & out_n,ch
 		inner_stat.output_packet_num++;
 		inner_stat.output_packet_size+=len;

-		if(data==0) return 0;
+		if(data==0)
+		{
+			out_n=0;
+			return 0;
+		}
 		out_n=1;
 		static char *data_static;
 		data_static=data;
@@ -472,7 +490,7 @@ int unit_test()
 		int * len;
 		fec_decode_manager.output(n,s_arr,len);

-		fec_encode_manager.re_init(3,2,g_fec_mtu,g_fec_queue_len,g_fec_timeout,1);
+		fec_encode_manager.reset_fec_parameter(3,2,g_fec_mtu,g_fec_queue_len,g_fec_timeout,1);

 		fec_encode_manager.input((char *) a.c_str(), a.length());
 		fec_encode_manager.output(n,s_arr,len);
@@ -541,6 +559,7 @@ void process_arg(int argc, char *argv[])
 		{"disable-fec", no_argument,    0, 1},
 		{"disable-obscure", no_argument,    0, 1},
 		{"disable-xor", no_argument,    0, 1},
+		{"disable-checksum", no_argument,    0, 1},
 		{"fix-latency", no_argument,    0, 1},
 		{"sock-buf", required_argument,    0, 1},
 		{"random-drop", required_argument,    0, 1},
@@ -554,15 +573,15 @@ void process_arg(int argc, char *argv[])
 		{"fec", required_argument,   0,'f'},
 		{"jitter", required_argument,   0,'j'},
 		{"fifo", required_argument,    0, 1},
-		{"tun-dev", optional_argument,    0, 1},
+		{"sub-net", required_argument,    0, 1},
+		{"tun-dev", required_argument,    0, 1},
+		{"tun-mtu", required_argument,    0, 1},
+		{"disable-mssfix", no_argument,    0, 1},
+		{"keep-reconnect", no_argument,    0, 1},
 		{NULL, 0, 0, 0}
      };
    int option_index = 0;
-	if (argc == 1)
-	{
-		print_help();
-		myexit( -1);
-	}
+
 	for (i = 0; i < argc; i++)
 	{
 		if(strcmp(argv[i],"--unit-test")==0)
@@ -571,14 +590,7 @@ void process_arg(int argc, char *argv[])
 			myexit(0);
 		}
 	}
-	for (i = 0; i < argc; i++)
-	{
-		if(strcmp(argv[i],"-h")==0||strcmp(argv[i],"--help")==0)
-		{
-			print_help();
-			myexit(0);
-		}
-	}
+
 	for (i = 0; i < argc; i++)
 	{
 		if(strcmp(argv[i],"--log-level")==0)
@@ -609,11 +621,6 @@ void process_arg(int argc, char *argv[])
 	}
 	log_bare(log_info, "\n");

-	if (argc == 1)
-	{
-		print_help();
-		myexit(-1);
-	}

 	int no_l = 1, no_r = 1;
 	while ((opt = getopt_long(argc, argv, "l:r:hcsk:j:f:p:n:i:q:",long_options,&option_index)) != -1)
@@ -773,6 +780,11 @@ void process_arg(int argc, char *argv[])
 				mylog(log_info,"xor disabled\n");
 				disable_xor=1;
 			}
+			else if(strcmp(long_options[option_index].name,"disable-checksum")==0)
+			{
+				disable_checksum=1;
+				mylog(log_warn,"checksum disabled\n");
+			}
 			else if(strcmp(long_options[option_index].name,"fix-latency")==0)
 			{
 				mylog(log_info,"fix-latency enabled\n");
@@ -872,12 +884,35 @@ void process_arg(int argc, char *argv[])

 				mylog(log_info,"fifo_file =%s \n",fifo_file);
 			}
+			else if(strcmp(long_options[option_index].name,"keep-reconnect")==0)
+			{
+				keep_reconnect=1;
+				mylog(log_info,"keep_reconnect enabled\n");
+			}
+			else if(strcmp(long_options[option_index].name,"sub-net")==0)
+			{
+				sscanf(optarg,"%s",sub_net);
+				mylog(log_info,"sub_net %s\n",sub_net);
+
+			}
 			else if(strcmp(long_options[option_index].name,"tun-dev")==0)
 			{
-				//sscanf(optarg,"%s",fifo_file);
-				mylog(log_info,"enabled tun-dev mode\n");
+				sscanf(optarg,"%s",tun_dev);
+				mylog(log_info,"tun_dev=%s\n",tun_dev);
+
+				mylog(log_info,"running at tun-dev mode\n");
 				working_mode=tun_dev_mode;
 			}
+			else if(strcmp(long_options[option_index].name,"tun-mtu")==0)
+			{
+				sscanf(optarg,"%d",&tun_mtu);
+				mylog(log_warn,"changed tun_mtu,tun_mtu=%d\n",tun_mtu);
+			}
+			else if(strcmp(long_options[option_index].name,"disable-mssfix")==0)
+			{
+				mssfix=0;
+				mylog(log_warn,"mssfix disabled\n");
+			}
 			else
 			{
 				mylog(log_fatal,"unknown option\n");
@@ -937,60 +972,3 @@ void process_arg(int argc, char *argv[])

 }

-void print_help()
-{
-	char git_version_buf[100]={0};
-	strncpy(git_version_buf,gitversion,10);
-
-	printf("UDPspeeder V2\n");
-	printf("git version: %s    ",git_version_buf);
-	printf("build date: %s %s\n",__DATE__,__TIME__);
-	printf("repository: https://github.com/wangyu-/UDPspeeder\n");
-	printf("\n");
-	printf("usage:\n");
-	printf("    run as client: ./this_program -c -l local_listen_ip:local_port -r server_ip:server_port  [options]\n");
-	printf("    run as server: ./this_program -s -l server_listen_ip:server_port -r remote_ip:remote_port  [options]\n");
-	printf("\n");
-	printf("common options, must be same on both sides:\n");
-	printf("    -k,--key              <string>        key for simple xor encryption. if not set, xor is disabled\n");
-
-	printf("main options:\n");
-	printf("    -f,--fec              x:y             forward error correction, send y redundant packets for every x packets\n");
-	printf("    --timeout             <number>        how long could a packet be held in queue before doing fec, unit: ms, default: 8ms\n");
-	printf("    --mode                <number>        fec-mode,available values: 0, 1; 0 cost less bandwidth, 1 cost less latency(default)\n");
-	printf("    --report              <number>        turn on send/recv report, and set a period for reporting, unit: s\n");
-
-	printf("advanced options:\n");
-	printf("    --mtu                 <number>        mtu. for mode 0, the program will split packet to segment smaller than mtu_value.\n");
-	printf("                                          for mode 1, no packet will be split, the program just check if the mtu is exceed.\n");
-	printf("                                          default value: 1250\n");
-	printf("    -j,--jitter           <number>        simulated jitter. randomly delay first packet for 0~<number> ms, default value: 0.\n");
-	printf("                                          do not use if you dont know what it means.\n");
-	printf("    -i,--interval         <number>        scatter each fec group to a interval of <number> ms, to protect burst packet loss.\n");
-	printf("                                          default value: 0. do not use if you dont know what it means.\n");
-	printf("    --random-drop         <number>        simulate packet loss, unit: 0.01%%. default value: 0\n");
-	printf("    --disable-obscure     <number>        disable obscure, to save a bit bandwidth and cpu\n");
-//	printf("    --disable-xor         <number>        disable xor\n");
-
-	printf("developer options:\n");
-	printf("    --fifo                <string>        use a fifo(named pipe) for sending commands to the running program, so that you\n");
-	printf("                                          can change fec encode parameters dynamically, check readme.md in repository for\n");
-	printf("                                          supported commands.\n");
-	printf("    -j ,--jitter          jmin:jmax       similiar to -j above, but create jitter randomly between jmin and jmax\n");
-	printf("    -i,--interval         imin:imax       similiar to -i above, but scatter randomly between imin and imax\n");
-    printf("    -q,--queue-len        <number>        max fec queue len, only for mode 0\n");
-    printf("    --decode-buf          <number>        size of buffer of fec decoder,u nit: packet, default: 2000\n");
-    printf("    --fix-latency         <number>        try to stabilize latency, only for mode 0\n");
-    printf("    --delay-capacity      <number>        max number of delayed packets\n");
-	printf("    --disable-fec         <number>        completely disable fec, turn the program into a normal udp tunnel\n");
-	printf("    --sock-buf            <number>        buf size for socket, >=10 and <=10240, unit: kbyte, default: 1024\n");
-	printf("log and help options:\n");
-	printf("    --log-level           <number>        0: never    1: fatal   2: error   3: warn \n");
-	printf("                                          4: info (default)      5: debug   6: trace\n");
-	printf("    --log-position                        enable file name, function name, line number in log\n");
-	printf("    --disable-color                       disable log color\n");
-	printf("    -h,--help                             print this help message\n");
-
-	//printf("common options,these options must be same on both side\n");
-}
-
--- a/misc.h
+++ b/misc.h
@@ -13,7 +13,7 @@
 #include "fd_manager.h"
 #include "delay_manager.h"
 #include "fec_manager.h"
-#include "git_version.h"
+


 extern char fifo_file[1000];
@@ -22,6 +22,7 @@ extern int mtu_warn;

 extern int disable_mtu_warn;
 extern int disable_fec;
+extern int disable_checksum;

 extern int debug_force_flush_fec;

@@ -46,7 +47,11 @@ extern int time_mono_test;

 extern int delay_capacity;

+extern int keep_reconnect;

+extern int tun_mtu;
+
+extern int mssfix;


 int from_normal_to_fec(conn_info_t & conn_info,char *data,int len,int & out_n,char **&out_arr,int *&out_len,my_time_t *&out_delay);
@@ -58,9 +63,12 @@ int handle_command(char *s);

 int unit_test();

-void print_help();
+//void print_help();

 void process_arg(int argc, char *argv[]);

+extern char sub_net[100];
+extern u32_t sub_net_uint32;
+extern char tun_dev[100];

 #endif /* MISC_H_ */
--- a/packet.cpp
+++ b/packet.cpp
@@ -9,6 +9,7 @@
 #include "common.h"
 #include "log.h"
 #include "packet.h"
+#include "misc.h"

 int iv_min=4;
 int iv_max=32;//< 256;
@@ -177,9 +178,7 @@ int my_send(const dest_t &dest,char *data,int len)
 {
 	if(dest.cook)
 	{
-		put_crc32(data,len);
-		if(!disable_obscure)do_obscure(data,len);
-		if(!disable_xor)encrypt_0(data,len,key_string);
+		do_cook(data,len);
 	}
 	switch(dest.type)
 	{
@@ -201,6 +200,11 @@ int my_send(const dest_t &dest,char *data,int len)
 			return send_fd(dest.inner.fd,data,len,0);
 			break;
 		}
+		case type_write_fd:
+		{
+			return write(dest.inner.fd,data,len);
+			break;
+		}
 		case type_fd64:
 		{

@@ -312,6 +316,7 @@ int get_conv0(u32_t &conv,const char *input,int len_in,char *&output,int &len_ou
 }
 int put_crc32(char * s,int &len)
 {
+	if(disable_checksum)return 0;
 	assert(len>=0);
 	//if(len<0) return -1;
 	u32_t crc32=crc32h((unsigned char *)s,len);
@@ -322,6 +327,14 @@ int put_crc32(char * s,int &len)
 	return 0;
 }

+int do_cook(char * data,int &len)
+{
+	put_crc32(data,len);
+	if(!disable_obscure)do_obscure(data,len);
+	if(!disable_xor)encrypt_0(data,len,key_string);
+	return 0;
+}
+
 int de_cook(char * s,int &len)
 {
 	if(!disable_xor)decrypt_0(s,len,key_string);
@@ -344,8 +357,8 @@ int de_cook(char * s,int &len)
 }
 int rm_crc32(char * s,int &len)
 {
+	if(disable_checksum)return 0;
 	assert(len>=0);
-
 	len-=sizeof(u32_t);
 	if(len<0) return -1;
 	u32_t crc32_in=read_u32(s+len);
--- a/packet.h
+++ b/packet.h
@@ -42,5 +42,6 @@ int put_conv(u32_t conv,const char * input,int len_in,char *&output,int &len_out
 int get_conv(u32_t &conv,const char *input,int len_in,char *&output,int &len_out );
 int put_crc32(char * s,int &len);
 int rm_crc32(char * s,int &len);
+int do_cook(char * data,int &len);
 int de_cook(char * s,int &len);
 #endif /* PACKET_H_ */
--- a/tun_dev.cpp
+++ b/tun_dev.cpp
@@ -1,411 +0,0 @@
-/*
- * tun.cpp
- *
- *  Created on: Oct 26, 2017
- *      Author: root
- */
-
-
-#include "common.h"
-#include "log.h"
-#include "misc.h"
-
-
-int get_tun_fd(char * dev_name)
-{
-	int tun_fd=open("/dev/net/tun",O_RDWR);
-
-	if(tun_fd <0)
-	{
-		mylog(log_fatal,"open /dev/net/tun failed");
-		myexit(-1);
-	}
-	struct ifreq ifr;
-	memset(&ifr, 0, sizeof(ifr));
-	ifr.ifr_flags = IFF_TUN|IFF_NO_PI;
-
-	strncpy(ifr.ifr_name, dev_name, IFNAMSIZ);
-
-	if(ioctl(tun_fd, TUNSETIFF, (void *)&ifr) != 0)
-	{
-		mylog(log_fatal,"open /dev/net/tun failed");
-		myexit(-1);
-	}
-	return tun_fd;
-}
-
-int set_if(char *if_name,char * local_ip,char * remote_ip,int mtu)
-{
-	//printf("i m here1\n");
-	struct ifreq ifr;
-	struct sockaddr_in sai;
-	memset(&ifr,0,sizeof(ifr));
-	memset(&sai, 0, sizeof(struct sockaddr));
-
-	int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
-	strncpy(ifr.ifr_name, if_name, IFNAMSIZ);
-
-    sai.sin_family = AF_INET;
-    sai.sin_port = 0;
-    sai.sin_addr.s_addr = inet_addr(local_ip);
-    memcpy(&ifr.ifr_addr,&sai, sizeof(struct sockaddr));
-    assert(ioctl(sockfd, SIOCSIFADDR, &ifr)==0);
-
-
-
-    sai.sin_addr.s_addr = inet_addr(local_ip);
-    memcpy(&ifr.ifr_addr,&sai, sizeof(struct sockaddr));
-    assert(ioctl(sockfd, SIOCSIFADDR, &ifr)==0);
-
-
-
-    sai.sin_addr.s_addr = inet_addr(remote_ip);
-    memcpy(&ifr.ifr_addr,&sai, sizeof(struct sockaddr));
-    assert(ioctl(sockfd, SIOCSIFDSTADDR, &ifr)==0);
-
-    ifr.ifr_mtu=mtu;
-    assert(ioctl(sockfd, SIOCSIFMTU, &ifr)==0);
-
-
-    assert(ioctl(sockfd, SIOCGIFFLAGS, &ifr)==0);
-   // ifr.ifr_flags |= ( IFF_UP|IFF_POINTOPOINT|IFF_RUNNING|IFF_NOARP|IFF_MULTICAST );
-    ifr.ifr_flags |= ( IFF_UP|IFF_POINTOPOINT|IFF_RUNNING|IFF_NOARP|IFF_MULTICAST );
-    assert(ioctl(sockfd, SIOCSIFFLAGS, &ifr)==0);
-
-    //printf("i m here2\n");
-	return 0;
-}
-
-//enum tun_header_t {header_reserved=0,header_normal=1,header_new=2,header_reject=3};
-const char header_normal=1;
-const char header_new_connect=2;
-const char header_reject=3;
-
-int put_header(char header,char *& data,int &len)
-{
-	assert(len>=0);
-	data=data-1;
-	data[0]=header;
-	len+=1;
-	return 0;
-}
-int get_header(char &header,char *& data,int &len)
-{
-	assert(len>=0);
-	if(len<1) return -1;
-	header=data[0];
-	data=data+1;
-	len-=1;
-	return 0;
-}
-
-
-int tun_dev_client_event_loop()
-{
-	char buf0[buf_len+100];
-	char *data=buf0+100;
-	int len;
-	int i,j,k,ret;
-	int epoll_fd,tun_fd;
-
-	int remote_fd;
-	fd64_t remote_fd64;
-
-	tun_fd=get_tun_fd("tun11");
-	assert(tun_fd>0);
-
-	assert(new_connected_socket(remote_fd,remote_ip_uint32,remote_port)==0);
-	remote_fd64=fd_manager.create(remote_fd);
-
-	assert(set_if("tun11","10.0.0.2","10.0.0.1",1000)==0);
-
-	epoll_fd = epoll_create1(0);
-	assert(epoll_fd>0);
-
-	const int max_events = 4096;
-	struct epoll_event ev, events[max_events];
-	if (epoll_fd < 0) {
-		mylog(log_fatal,"epoll return %d\n", epoll_fd);
-		myexit(-1);
-	}
-
-	ev.events = EPOLLIN;
-	ev.data.u64 = remote_fd64;
-	ret = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, remote_fd, &ev);
-	if (ret!=0) {
-		mylog(log_fatal,"add  remote_fd64 error\n");
-		myexit(-1);
-	}
-
-	ev.events = EPOLLIN;
-	ev.data.u64 = tun_fd;
-	ret = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, tun_fd, &ev);
-	if (ret!=0) {
-		mylog(log_fatal,"add  tun_fd error\n");
-		myexit(-1);
-	}
-
-	dest_t dest;
-	dest.type=type_fd64;
-	dest.inner.fd64=remote_fd64;
-	//dest.conv=conv;
-	//dest.inner.ip_port=dest_ip_port;
-	//dest.cook=1;
-
-
-	int got_feed_back=0;
-
-	while(1)////////////////////////
-	{
-
-		if(about_to_exit) myexit(0);
-
-		int nfds = epoll_wait(epoll_fd, events, max_events, 180 * 1000);
-		if (nfds < 0) {  //allow zero
-			if(errno==EINTR  )
-			{
-				mylog(log_info,"epoll interrupted by signal\n");
-				myexit(0);
-			}
-			else
-			{
-				mylog(log_fatal,"epoll_wait return %d\n", nfds);
-				myexit(-1);
-			}
-		}
-		int idx;
-		for (idx = 0; idx < nfds; ++idx)
-		{
-			if(events[idx].data.u64==(u64_t)tun_fd)
-			{
-				len=read(tun_fd,data,max_data_len);
-				assert(len>=0);
-
-				mylog(log_trace,"Received packet from tun,len: %d\n",len);
-
-				if(got_feed_back==0)
-					put_header(header_new_connect,data,len);
-				else
-					put_header(header_normal,data,len);
-
-				delay_manager.add(0,dest,data,len);;
-			}
-			else if(events[idx].data.u64==(u64_t)remote_fd64)
-			{
-				fd64_t fd64=events[idx].data.u64;
-				int fd=fd_manager.to_fd(fd64);
-
-				len=recv(fd,data,max_data_len,0);
-
-				if(len<0)
-				{
-					mylog(log_warn,"recv return %d,errno=%s\n",len,strerror(errno));
-					continue;
-				}
-
-				char header=0;
-				if(get_header(header,data,len)!=0)
-				{
-					mylog(log_warn,"get_header failed\n");
-					continue;
-				}
-				if(header==header_reject)
-				{
-					mylog(log_fatal,"server switched to handle another client,exit\n");
-					myexit(-1);
-					continue;
-				}
-				else if(header==header_normal)
-				{
-					got_feed_back=1;
-				}
-				else
-				{
-					mylog(log_warn,"invalid header\n");
-					continue;
-				}
-
-				mylog(log_trace,"Received packet from udp,len: %d\n",len);
-				assert(len>=0);
-
-				assert(write(tun_fd,data,len)>=0);
-			}
-		}
-		delay_manager.check();
-	}
-
-
-	return 0;
-}
-
-int tun_dev_server_event_loop()
-{
-	char buf0[buf_len+100];
-	char *data=buf0+100;
-	int len;
-	int i,j,k,ret;
-	int epoll_fd,tun_fd;
-
-	int local_listen_fd;
-	//fd64_t local_listen_fd64;
-
-	tun_fd=get_tun_fd("tun11");
-	assert(tun_fd>0);
-
-	assert(new_listen_socket(local_listen_fd,local_ip_uint32,local_port)==0);
-  //  local_listen_fd64=fd_manager.create(local_listen_fd);
-
-	assert(set_if("tun11","10.0.0.1","10.0.0.2",1000)==0);
-
-	epoll_fd = epoll_create1(0);
-	assert(epoll_fd>0);
-
-	const int max_events = 4096;
-	struct epoll_event ev, events[max_events];
-	if (epoll_fd < 0) {
-		mylog(log_fatal,"epoll return %d\n", epoll_fd);
-		myexit(-1);
-	}
-
-	ev.events = EPOLLIN;
-	ev.data.u64 = local_listen_fd;
-	ret = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, local_listen_fd, &ev);
-	if (ret!=0) {
-		mylog(log_fatal,"add  udp_listen_fd error\n");
-		myexit(-1);
-	}
-
-	ev.events = EPOLLIN;
-	ev.data.u64 = tun_fd;
-	ret = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, tun_fd, &ev);
-	if (ret!=0) {
-		mylog(log_fatal,"add  tun_fd error\n");
-		myexit(-1);
-	}
-
-	//ip_port_t dest_ip_port;
-
-	dest_t dest;
-	dest.type=type_fd_ip_port;
-
-	dest.inner.fd_ip_port.fd=local_listen_fd;
-	dest.inner.fd_ip_port.ip_port.ip=0;
-	dest.inner.fd_ip_port.ip_port.port=0;
-	//dest.conv=conv;
-	//dest.inner.ip_port=dest_ip_port;
-	//dest.cook=1;
-
-	while(1)////////////////////////
-	{
-
-		if(about_to_exit) myexit(0);
-
-		int nfds = epoll_wait(epoll_fd, events, max_events, 180 * 1000);
-		if (nfds < 0) {  //allow zero
-			if(errno==EINTR  )
-			{
-				mylog(log_info,"epoll interrupted by signal\n");
-				myexit(0);
-			}
-			else
-			{
-				mylog(log_fatal,"epoll_wait return %d\n", nfds);
-				myexit(-1);
-			}
-		}
-		int idx;
-		for (idx = 0; idx < nfds; ++idx)
-		{
-
-			if(events[idx].data.u64==(u64_t)local_listen_fd)
-			{
-				struct sockaddr_in udp_new_addr_in={0};
-				socklen_t udp_new_addr_len = sizeof(sockaddr_in);
-				if ((len = recvfrom(local_listen_fd, data, max_data_len, 0,
-						(struct sockaddr *) &udp_new_addr_in, &udp_new_addr_len)) == -1) {
-					mylog(log_error,"recv_from error,this shouldnt happen,err=%s,but we can try to continue\n",strerror(errno));
-					continue;
-					//myexit(1);
-				};
-				char header=0;
-				if(get_header(header,data,len)!=0)
-				{
-					mylog(log_warn,"get_header failed\n");
-					continue;
-				}
-
-				if((dest.inner.fd_ip_port.ip_port.ip==udp_new_addr_in.sin_addr.s_addr) && (dest.inner.fd_ip_port.ip_port.port=ntohs(udp_new_addr_in.sin_port)))
-				{
-					if(header!=header_new_connect&& header!=header_normal)
-					{
-						mylog(log_warn,"invalid header\n");
-						continue;
-					}
-				}
-				else
-				{
-					if(header==header_new_connect)
-					{
-						mylog(log_info,"new connection from %s:%d \n", inet_ntoa(udp_new_addr_in.sin_addr),
-												ntohs(udp_new_addr_in.sin_port));
-						dest.inner.fd_ip_port.ip_port.ip=udp_new_addr_in.sin_addr.s_addr;
-						dest.inner.fd_ip_port.ip_port.port=ntohs(udp_new_addr_in.sin_port);
-					}
-					else
-					{
-						mylog(log_info,"rejected connection from %s:%d\n", inet_ntoa(udp_new_addr_in.sin_addr),ntohs(udp_new_addr_in.sin_port));
-
-
-						len=1;
-						data[0]=header_reject;
-
-						dest_t tmp_dest;
-						tmp_dest.type=type_fd_ip_port;
-
-						tmp_dest.inner.fd_ip_port.fd=local_listen_fd;
-						tmp_dest.inner.fd_ip_port.ip_port.ip=udp_new_addr_in.sin_addr.s_addr;
-						tmp_dest.inner.fd_ip_port.ip_port.port=ntohs(udp_new_addr_in.sin_port);
-
-						delay_manager.add(0,tmp_dest,data,len);;
-						continue;
-					}
-				}
-
-
-
-				mylog(log_trace,"Received packet from %s:%d,len: %d\n", inet_ntoa(udp_new_addr_in.sin_addr),
-						ntohs(udp_new_addr_in.sin_port),len);
-
-				ret=write(tun_fd,data,len);
-				if( ret<0 )
-				{
-					mylog(log_warn,"write to tun failed len=%d ret=%d\n errno=%s\n",len,ret,strerror(errno));
-				}
-
-			}
-			else if(events[idx].data.u64==(u64_t)tun_fd)
-			{
-				len=read(tun_fd,data,max_data_len);
-				assert(len>=0);
-
-				mylog(log_trace,"Received packet from tun,len: %d\n",len);
-
-				if(dest.inner.fd64_ip_port.ip_port.to_u64()==0)
-				{
-					mylog(log_warn,"there is no client yet\n");
-					continue;
-				}
-
-				put_header(header_normal,data,len);
-
-				delay_manager.add(0,dest,data,len);;
-
-
-			}
-		}
-		delay_manager.check();
-	}
-
-
-	return 0;
-}
--- a/tun_dev.h
+++ b/tun_dev.h
@@ -1,16 +0,0 @@
-/*
- * tun.h
- *
- *  Created on: Oct 26, 2017
- *      Author: root
- */
-
-#ifndef TUN_DEV_H_
-#define TUN_DEV_H_
-
-
-int tun_dev_client_event_loop();
-
-int tun_dev_server_event_loop();
-
-#endif /* TUN_H_ */
--- a/tunnel.cpp
+++ b/tunnel.cpp
@@ -70,12 +70,12 @@ int tunnel_client_event_loop()
 		myexit(-1);
 	}

-	u64_t fd64=conn_info.fec_encode_manager.get_timer_fd64();
+	u64_t tmp_fd64=conn_info.fec_encode_manager.get_timer_fd64();
 	ev.events = EPOLLIN;
-	ev.data.u64 = fd64;
+	ev.data.u64 = tmp_fd64;

 	mylog(log_debug,"conn_info.fec_encode_manager.get_timer_fd64()=%llu\n",conn_info.fec_encode_manager.get_timer_fd64());
-	ret = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd_manager.to_fd(fd64), &ev);
+	ret = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd_manager.to_fd(tmp_fd64), &ev);
 	if (ret!= 0) {
 		mylog(log_fatal,"add fec_encode_manager.get_timer_fd64() error\n");
 		myexit(-1);
@@ -113,12 +113,12 @@ int tunnel_client_event_loop()
 		if (nfds < 0) {  //allow zero
 			if(errno==EINTR  )
 			{
-				mylog(log_info,"epoll interrupted by signal\n");
-				myexit(0);
+				mylog(log_info,"epoll interrupted by signal continue\n");
+				//myexit(0);
 			}
 			else
 			{
-				mylog(log_fatal,"epoll_wait return %d\n", nfds);
+				mylog(log_fatal,"epoll_wait return %d,%s\n", nfds,strerror(errno));
 				myexit(-1);
 			}
 		}
@@ -173,6 +173,7 @@ int tunnel_client_event_loop()

 				if(events[idx].data.u64 == conn_info.fec_encode_manager.get_timer_fd64())
 				{
+					fd64_t fd64=events[idx].data.u64;
 					mylog(log_trace,"events[idx].data.u64 == conn_info.fec_encode_manager.get_timer_fd64()\n");

 					//mylog(log_info,"timer!!!\n");
@@ -314,6 +315,7 @@ int tunnel_client_event_loop()
 					if(!conn_info.conv_manager.is_conv_used(conv))
 					{
 						mylog(log_trace,"!conn_info.conv_manager.is_conv_used(conv)");
+						continue;
 					}

 					conn_info.conv_manager.update_active_time(conv);
@@ -415,12 +417,12 @@ int tunnel_server_event_loop()
 		if (nfds < 0) {  //allow zero
 			if(errno==EINTR  )
 			{
-				mylog(log_info,"epoll interrupted by signal\n");
-				myexit(0);
+				mylog(log_info,"epoll interrupted by signal,continue\n");
+				//myexit(0);
 			}
 			else
 			{
-				mylog(log_fatal,"epoll_wait return %d\n", nfds);
+				mylog(log_fatal,"epoll_wait return %d,%s\n", nfds,strerror(errno));
 				myexit(-1);
 			}
 		}
Author	SHA1	Message	Date
wangyu-	abe55c02d5	fix last commit	2018-08-03 17:01:19 -05:00
wangyu-	f96e8c9a94	new option disable-checksum	2018-08-03 16:43:56 -05:00
wangyu-	4d3b713b05	fixed get_current_time()	2017-11-24 11:07:37 -06:00
wangyu-	5f0a16cd1f	more log info for epoll_wait	2017-11-23 09:58:53 -06:00
wangyu-	a8ed6c8b5e	do not quit after got EINTR	2017-11-23 09:42:52 -06:00
wangyu-	eaa0e2b54f	Create ISSUE_TEMPLATE.md	2017-11-22 18:52:09 -06:00
wangyu-	6a069f7dc2	Update README.md	2017-11-21 13:42:38 -06:00
wangyu-	0348fcedf6	changed default mode to mode 0;improve help page	2017-11-21 13:42:38 -06:00
wangyu-	4a4b3dc693	Update README.zh-cn.md	2017-11-21 13:42:38 -06:00
wangyu-	9336246f00	fixed a possible MTU issue when redundant num=0	2017-11-21 13:42:38 -06:00
wangyu-	a1d5a3805a	increased timeout	2017-11-21 13:42:38 -06:00
wangyu-	baebad1e93	Update README.md	2017-11-21 13:42:38 -06:00
wangyu-	9a23775dfa	increased timeout	2017-11-21 13:42:38 -06:00
wangyu-	daab328cf2	changed a log	2017-11-21 13:42:38 -06:00
wangyu-	0e3dee9920	relax an assert	2017-11-21 13:42:38 -06:00
wangyu-	53e580b876	added version.txt	2017-11-21 13:42:38 -06:00
wangyu-	fd076e0a2e	Update README.zh-cn.md	2017-11-21 13:42:37 -06:00
wangyu-	057d5262a4	do not drop packet in mode 1	2017-11-21 13:42:37 -06:00
wangyu-	214d3afa98	changed parameter	2017-11-21 13:42:37 -06:00
wangyu-	cb2e337c94	Update README.zh-cn.md	2017-11-21 13:42:37 -06:00
wangyu-	cf24f76bf8	revert last comit	2017-11-21 13:42:37 -06:00
wangyu-	ec63c61e09	relax restriction for fec_data_num==1	2017-11-21 13:42:37 -06:00
wangyu-	d83ae88716	Add files via upload	2017-11-21 13:42:37 -06:00
wangyu-	e5548693df	Delete ping_compare_cn.PNG	2017-11-21 13:42:37 -06:00
wangyu-	feeb0f1e45	Update README.zh-cn.md	2017-11-21 13:42:37 -06:00
wangyu-	5e6890a52c	Add files via upload	2017-11-21 13:42:37 -06:00
wangyu-	db7b726987	update log	2017-11-21 13:42:37 -06:00
wangyu-	b0614beffa	new function tcp csum	2017-11-21 13:42:37 -06:00
wangyu-	2dbb26e394	fixed log	2017-11-21 13:42:37 -06:00
wangyu-	d166432f37	Update README.zh-cn.md	2017-11-21 13:42:37 -06:00
wangyu-	bcdb08691b	add option keep-reconnect	2017-11-21 13:42:37 -06:00
wangyu-	f6dba6da1f	trival	2017-11-21 13:42:36 -06:00
wangyu-	2419801654	changed default sub-net	2017-11-21 13:42:36 -06:00
wangyu-	5672891485	trival	2017-11-21 13:42:36 -06:00
wangyu-	7f18ccee94	refactor	2017-11-21 13:42:36 -06:00
wangyu-	2f0cfe41b1	changed --tun-dev to required argument	2017-11-21 13:42:36 -06:00
wangyu-	7081c02171	changed parameter	2017-11-21 13:42:36 -06:00
wangyu-	1c03463a82	fixed a missed continue	2017-11-21 13:42:36 -06:00
wangyu-	b0476f5a3a	Update README.zh-cn.md	2017-11-21 13:42:36 -06:00
wangyu-	96fd058985	removed tun_dev.cpp and .h	2017-11-21 13:42:36 -06:00
wangyu-	12c65a4564	add dest ip restriction	2017-11-21 13:42:36 -06:00
wangyu-	36c8a36976	fixed typo	2017-11-21 13:42:36 -06:00
wangyu-	7de806f57a	more log,more robust	2017-11-21 13:42:36 -06:00
wangyu-	a3b5187b1f	aloww len==fec_mtu	2017-11-21 13:42:36 -06:00
wangyu-	ba81aa14d4	just commit	2017-11-21 13:42:36 -06:00