cli_bind_address_connect

* replaces -b dummy option in dbclient to be similar with openssh -b option
* useful in multi-wan connections

cli-main.c

@@ -66,8 +66,8 @@ int main(int argc, char ** argv) {
 	}
 #endif
-	TRACE(("user='%s' host='%s' port='%s'", cli_opts.username,
-				cli_opts.remotehost, cli_opts.remoteport))
+	TRACE(("user='%s' host='%s' port='%s' bind_address='%s'", cli_opts.username,
+				cli_opts.remotehost, cli_opts.remoteport, cli_opts.bind_address))
 	if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
 		dropbear_exit("signal() error");
@@ -86,7 +86,7 @@ int main(int argc, char ** argv) {
 	} else
 #endif
 	{
-		progress = connect_remote(cli_opts.remotehost, cli_opts.remoteport, cli_connected, &ses);
+		progress = connect_remote(cli_opts.remotehost, cli_opts.remoteport, cli_connected, &ses, cli_opts.bind_address);
 		sock_in = sock_out = -1;
 	}

cli-runopts.c

@@ -92,6 +92,7 @@ static void printhelp() {
 					"-c <cipher list> Specify preferred ciphers ('-c help' to list options)\n"
 					"-m <MAC list> Specify preferred MACs for packet verification (or '-m help')\n"
 #endif
+					"-b    bind_address\n"
 					"-V    Version\n"
 #if DEBUG_TRACE
 					"-v    verbose (compiled with DEBUG_TRACE)\n"
@@ -125,7 +126,6 @@ void cli_getopts(int argc, char ** argv) {
 		OPT_OTHER
 	} opt;
 	unsigned int cmdlen;
-	char* dummy = NULL; /* Not used for anything real */
 	char* recv_window_arg = NULL;
 	char* keepalive_arg = NULL;
@@ -166,6 +166,7 @@ void cli_getopts(int argc, char ** argv) {
 #if DROPBEAR_CLI_PROXYCMD
 	cli_opts.proxycmd = NULL;
 #endif
+	cli_opts.bind_address = NULL;
 #ifndef DISABLE_ZLIB
 	opts.compress_mode = DROPBEAR_COMPRESS_ON;
 #endif
@@ -314,8 +315,8 @@ void cli_getopts(int argc, char ** argv) {
 					exit(EXIT_SUCCESS);
 					break;
 				case 'b':
-					next = &dummy;
-					/* FALLTHROUGH */
+					next = &cli_opts.bind_address;
+					break;
 				default:
 					fprintf(stderr,
 						"WARNING: Ignoring unknown option -%c\n", c);

cli-tcpfwd.c

@@ -274,7 +274,7 @@ static int newtcpforwarded(struct Channel * channel) {
 	}
 	
 	snprintf(portstring, sizeof(portstring), "%u", fwd->connectport);
-	channel->conn_pending = connect_remote(fwd->connectaddr, portstring, channel_connect_done, channel);
+	channel->conn_pending = connect_remote(fwd->connectaddr, portstring, channel_connect_done, channel, NULL);
 	channel->prio = DROPBEAR_CHANNEL_PRIO_UNKNOWABLE;
 	

netio.c

@@ -19,6 +19,7 @@ struct dropbear_progress_connection {
 	int sock;
 	char* errstring;
+	struct addrinfo *bind_addrinfo;
 };
 /* Deallocate a progress connection. Removes from the pending list if iter!=NULL.
@@ -30,6 +31,7 @@ static void remove_connect(struct dropbear_progress_connection *c, m_list_elem *
 	m_free(c->remotehost);
 	m_free(c->remoteport);
 	m_free(c->errstring);
+	if (c->bind_addrinfo) freeaddrinfo(c->bind_addrinfo);
 	m_free(c);
 	if (iter) {
@@ -66,6 +68,17 @@ static void connect_try_next(struct dropbear_progress_connection *c) {
 			continue;
 		}
+		if (c->bind_addrinfo) {
+			if (bind(c->sock, c->bind_addrinfo->ai_addr, c->bind_addrinfo->ai_addrlen) < 0) {
+				/* failure */
+				m_free(c->errstring);
+				c->errstring = m_strdup(strerror(errno));
+				close(c->sock);
+				c->sock = -1;
+				continue;
+			}
+		}
+
 		ses.maxfd = MAX(ses.maxfd, c->sock);
 		set_sock_nodelay(c->sock);
 		setnonblocking(c->sock);
@@ -130,7 +143,7 @@ static void connect_try_next(struct dropbear_progress_connection *c) {
 /* Connect via TCP to a host. */
 struct dropbear_progress_connection *connect_remote(const char* remotehost, const char* remoteport,
-	connect_callback cb, void* cb_data)
+	connect_callback cb, void* cb_data, char* bind_address)
 {
 	struct dropbear_progress_connection *c = NULL;
 	int err;
@@ -142,6 +155,7 @@ struct dropbear_progress_connection *connect_remote(const char* remotehost, cons
 	c->sock = -1;
 	c->cb = cb;
 	c->cb_data = cb_data;
+	c->bind_addrinfo = NULL;
 	list_append(&ses.conn_pending, c);
@@ -160,6 +174,22 @@ struct dropbear_progress_connection *connect_remote(const char* remotehost, cons
 	} else {
 		c->res_iter = c->res;
 	}
+	
+	if (NULL != bind_address) {
+		memset(&hints, 0, sizeof(hints));
+		hints.ai_socktype = SOCK_STREAM;
+		hints.ai_family = AF_UNSPEC;
+		err = getaddrinfo(bind_address, NULL, &hints, &c->bind_addrinfo);
+		if (err) {
+			int len;
+			len = 100 + strlen(gai_strerror(err));
+			c->errstring = (char*)m_malloc(len);
+			snprintf(c->errstring, len, "Error resolving '%s'. %s", 
+					bind_address, gai_strerror(err));
+			TRACE(("Error resolving: %s", gai_strerror(err)))
+			c->res_iter = NULL;
+		}
+	}
 	return c;
 }

netio.h

@@ -30,7 +30,7 @@ typedef void(*connect_callback)(int result, int sock, void* data, const char* er
 /* Always returns a progress connection, if it fails it will call the callback at a later point */
 struct dropbear_progress_connection * connect_remote (const char* remotehost, const char* remoteport,
-	connect_callback cb, void *cb_data);
+	connect_callback cb, void *cb_data, char* bind_address);
 /* Sets up for select() */
 void set_connect_fds(fd_set *writefd);

runopts.h

@@ -167,6 +167,7 @@ typedef struct cli_runopts {
 #if DROPBEAR_CLI_PROXYCMD
 	char *proxycmd;
 #endif
+	char *bind_address;
 } cli_runopts;
 extern cli_runopts cli_opts;

svr-tcpfwd.c

@@ -285,7 +285,7 @@ static int newtcpdirect(struct Channel * channel) {
 	}
 	snprintf(portstring, sizeof(portstring), "%u", destport);
-	channel->conn_pending = connect_remote(desthost, portstring, channel_connect_done, channel);
+	channel->conn_pending = connect_remote(desthost, portstring, channel_connect_done, channel, NULL);
 	channel->prio = DROPBEAR_CHANNEL_PRIO_UNKNOWABLE;