Bind to address

Allow binding to address before sending UDP packets.

common.cpp

@@ -964,13 +964,20 @@ int new_listen_socket2(int &fd,address_t &addr)
 
 	return 0;
 }
-int new_connected_socket2(int &fd,address_t &addr)
+int new_connected_socket2(int &fd,address_t &addr,bool bind_enabled,address_t &bind_addr)
 {
 	fd = socket(addr.get_type(), SOCK_DGRAM, IPPROTO_UDP);
 	if (fd < 0) {
 		mylog(log_warn, "[%s]create udp_fd error\n", addr.get_str());
 		return -1;
 	}
+
+	if (bind_enabled && ::bind(fd, (struct sockaddr*) &bind_addr.inner, bind_addr.get_len()) == -1) {
+		mylog(log_fatal,"socket bind error\n");
+		//perror("socket bind error");
+		myexit(1);
+	}
+
 	setnonblocking(fd);
 	set_buf_size(fd, socket_buf_size);
 

common.h

@@ -446,7 +446,7 @@ int new_listen_socket(int &fd,u32_t ip,int port);
 int new_connected_socket(int &fd,u32_t ip,int port);
 
 int new_listen_socket2(int &fd,address_t &addr);
-int new_connected_socket2(int &fd,address_t &addr);
+int new_connected_socket2(int &fd,address_t &addr,bool bind_enabled,address_t &bind_addr);
 
 struct not_copy_able_t
 {

main.cpp

@@ -37,6 +37,7 @@ static void print_help()
 	printf("    --report              <number>        turn on send/recv report, and set a period for reporting, unit: s\n");
 
 	printf("advanced options:\n");
+	printf("    -b,--bind             ip:port         force all output packets to go through this ip. Set port to 0 to use a random one.\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");

misc.cpp

@@ -28,7 +28,8 @@ int output_interval_max=0*1000;
 
 int fix_latency=0;
 
-address_t local_addr,remote_addr;
+bool has_b=false;
+address_t local_addr,remote_addr,bind_addr;
 //u32_t local_ip_uint32,remote_ip_uint32=0;
 //char local_ip[100], remote_ip[100];
 //int local_port = -1, remote_port = -1;
@@ -654,6 +655,7 @@ void process_arg(int argc, char *argv[])
 		{"queue-len", required_argument,   0,'q'},
 		{"fec", required_argument,   0,'f'},
 		{"jitter", required_argument,   0,'j'},
+		{"bind", required_argument,   0,'b'},
 		{"header-overhead", required_argument,    0, 1},
 		//{"debug-fec", no_argument,    0, 1},
 		{"debug-fec-enc", no_argument,    0, 1},
@@ -717,7 +719,7 @@ void process_arg(int argc, char *argv[])
 
 
 	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)
+	while ((opt = getopt_long(argc, argv, "l:r:hcsk:j:f:p:n:i:q:b",long_options,&option_index)) != -1)
 	{
 		//string opt_key;
 		//opt_key+=opt;
@@ -824,6 +826,10 @@ void process_arg(int argc, char *argv[])
 			no_r = 0;
 			remote_addr.from_str(optarg);
 			break;
+		case 'b':
+			has_b = true;
+			bind_addr.from_str(optarg);
+			break;
 		case 'h':
 			break;
 		case 1:

misc.h

@@ -39,7 +39,8 @@ extern int fix_latency;
 //extern char local_ip[100], remote_ip[100];
 //extern int local_port, remote_port;
 
-extern address_t local_addr,remote_addr;
+extern bool has_b;
+extern address_t local_addr,remote_addr,bind_addr;
 
 extern conn_manager_t conn_manager;
 extern delay_manager_t delay_manager;

tunnel_client.cpp

@@ -295,7 +295,7 @@ int tunnel_client_event_loop()
     int & remote_fd=conn_info.remote_fd;
     fd64_t &remote_fd64=conn_info.remote_fd64;
 
-	assert(new_connected_socket2(remote_fd,remote_addr)==0);
+	assert(new_connected_socket2(remote_fd,remote_addr,has_b,bind_addr)==0);
 	remote_fd64=fd_manager.create(remote_fd);
 
 	mylog(log_debug,"remote_fd64=%llu\n",remote_fd64);

tunnel_server.cpp

@@ -232,7 +232,7 @@ static void local_listen_cb(struct ev_loop *loop, struct ev_io *watcher, int rev
 			}
 
 			int new_udp_fd;
-			ret=new_connected_socket2(new_udp_fd,remote_addr);
+			ret=new_connected_socket2(new_udp_fd,remote_addr,has_b,bind_addr);
 
 			if (ret != 0) {
 				mylog(log_warn, "[%s]new_connected_socket failed\n",addr.get_str());