X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet_socket.c;h=a39c2d2813f8532e32634ca01907cbf53fd3c8ee;hp=af3f2fe662eb70cf94b3adbe8edf20d4c5ce0e65;hb=ff306f0cdaedb50de1472e7c1fb55de922a6ca60;hpb=1d9dacb1f26971e19463b5501c2410c57f780ecb

diff --git a/src/net_socket.c b/src/net_socket.c
index af3f2fe6..a39c2d28 100644
--- a/src/net_socket.c
+++ b/src/net_socket.c
@@ -22,7 +22,6 @@
 
 #include "system.h"
 
-#include "splay_tree.h"
 #include "conf.h"
 #include "connection.h"
 #include "logger.h"
@@ -292,7 +291,8 @@ void retry_outgoing(outgoing_t *outgoing) {
 void finish_connecting(connection_t *c) {
 	logger(DEBUG_CONNECTIONS, LOG_INFO, "Connected to %s (%s)", c->name, c->hostname);
 
-	configure_tcp(c);
+	if(proxytype != PROXY_EXEC)
+		configure_tcp(c);
 
 	c->last_ping_time = time(NULL);
 	c->status.connecting = false;
@@ -300,168 +300,222 @@ void finish_connecting(connection_t *c) {
 	send_id(c);
 }
 
-bool do_outgoing_connection(connection_t *c) {
-	char *address, *port, *space;
-	int result;
+static void do_outgoing_pipe(connection_t *c, char *command) {
+#ifndef HAVE_MINGW
+	int fd[2];
+
+	if(socketpair(AF_UNIX, SOCK_STREAM, 0, fd)) {
+		logger(DEBUG_ALWAYS, LOG_ERR, "Could not create socketpair: %s", strerror(errno));
+		return;
+	}
+
+	if(fork()) {
+		c->socket = fd[0];
+		close(fd[1]);
+		logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Using proxy %s", command);
+		return;
+	}
+
+	close(0);
+	close(1);
+	close(fd[0]);
+	dup2(fd[1], 0);
+	dup2(fd[1], 1);
+	close(fd[1]);
+
+	// Other filedescriptors should be closed automatically by CLOEXEC
+
+	char *host = NULL;
+	char *port = NULL;
+
+	sockaddr2str(&c->address, &host, &port);
+	setenv("REMOTEADDRESS", host, true);
+	setenv("REMOTEPORT", port, true);
+	setenv("NODE", c->name, true);
+	setenv("NAME", myself->name, true);
+	if(netname)
+		setenv("NETNAME", netname, true);
+
+	int result = system(command);
+	if(result < 0)
+		logger(DEBUG_ALWAYS, LOG_ERR, "Could not execute %s: %s", command, strerror(errno));
+	else if(result)
+		logger(DEBUG_ALWAYS, LOG_ERR, "%s exited with non-zero status %d", command, result);
+	exit(result);
+#else
+	logger(DEBUG_ALWAYS, LOG_ERR, "Proxy type exec not supported on this platform!");
+	return;
+#endif
+}
+
+static void handle_meta_write(int sock, short events, void *data) {
+	connection_t *c = data;
+
+	ssize_t outlen = send(c->socket, c->outbuf.data + c->outbuf.offset, c->outbuf.len - c->outbuf.offset, 0);
+	if(outlen <= 0) {
+		if(!errno || errno == EPIPE) {
+			logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection closed by %s (%s)", c->name, c->hostname);
+		} else if(sockwouldblock(sockerrno)) {
+			logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Sending %d bytes to %s (%s) would block", c->outbuf.len - c->outbuf.offset, c->name, c->hostname);
+			return;
+		} else {
+			logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not send %d bytes of data to %s (%s): %s", c->outbuf.len - c->outbuf.offset, c->name, c->hostname, strerror(errno));
+		}
 
-	if(!c->outgoing) {
-		logger(DEBUG_ALWAYS, LOG_ERR, "do_outgoing_connection() for %s called without c->outgoing", c->name);
-		abort();
+		terminate_connection(c, c->status.active);
+		return;
 	}
 
+	buffer_read(&c->outbuf, outlen);
+	if(!c->outbuf.len && event_initialized(&c->outevent))
+		event_del(&c->outevent);
+}
+
+
+bool do_outgoing_connection(outgoing_t *outgoing) {
+	char *address, *port, *space;
+	struct addrinfo *proxyai = NULL;
+	int result;
+
 begin:
-	if(!c->outgoing->ai) {
-		if(!c->outgoing->cfg) {
-			logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not set up a meta connection to %s",
-					   c->name);
-			retry_outgoing(c->outgoing);
-			c->outgoing = NULL;
-			connection_del(c);
+	if(!outgoing->ai) {
+		if(!outgoing->cfg) {
+			logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not set up a meta connection to %s", outgoing->name);
+			retry_outgoing(outgoing);
 			return false;
 		}
 
-		get_config_string(c->outgoing->cfg, &address);
+		get_config_string(outgoing->cfg, &address);
 
 		space = strchr(address, ' ');
 		if(space) {
 			port = xstrdup(space + 1);
 			*space = 0;
 		} else {
-			if(!get_config_string(lookup_config(c->config_tree, "Port"), &port))
+			if(!get_config_string(lookup_config(outgoing->config_tree, "Port"), &port))
 				port = xstrdup("655");
 		}
 
-		c->outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
+		outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
 		free(address);
 		free(port);
 
-		c->outgoing->aip = c->outgoing->ai;
-		c->outgoing->cfg = lookup_config_next(c->config_tree, c->outgoing->cfg);
+		outgoing->aip = outgoing->ai;
+		outgoing->cfg = lookup_config_next(outgoing->config_tree, outgoing->cfg);
 	}
 
-	if(!c->outgoing->aip) {
-		if(c->outgoing->ai)
-			freeaddrinfo(c->outgoing->ai);
-		c->outgoing->ai = NULL;
+	if(!outgoing->aip) {
+		if(outgoing->ai)
+			freeaddrinfo(outgoing->ai);
+		outgoing->ai = NULL;
 		goto begin;
 	}
 
-	memcpy(&c->address, c->outgoing->aip->ai_addr, c->outgoing->aip->ai_addrlen);
-	c->outgoing->aip = c->outgoing->aip->ai_next;
+	connection_t *c = new_connection();
+	c->outgoing = outgoing;
 
-	if(c->hostname)
-		free(c->hostname);
+	memcpy(&c->address, outgoing->aip->ai_addr, outgoing->aip->ai_addrlen);
+	outgoing->aip = outgoing->aip->ai_next;
 
 	c->hostname = sockaddr2hostname(&c->address);
 
-	logger(DEBUG_CONNECTIONS, LOG_INFO, "Trying to connect to %s (%s)", c->name,
-			   c->hostname);
-
-	c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
-
-#ifdef FD_CLOEXEC
-	fcntl(c->socket, F_SETFD, FD_CLOEXEC);
-#endif
+	logger(DEBUG_CONNECTIONS, LOG_INFO, "Trying to connect to %s (%s)", outgoing->name, c->hostname);
+
+	if(!proxytype) {
+		c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
+		configure_tcp(c);
+	} else if(proxytype == PROXY_EXEC) {
+		do_outgoing_pipe(c, proxyhost);
+	} else {
+		proxyai = str2addrinfo(proxyhost, proxyport, SOCK_STREAM);
+		if(!proxyai) {
+			free_connection(c);
+			goto begin;
+		}
+		logger(DEBUG_CONNECTIONS, LOG_INFO, "Using proxy at %s port %s", proxyhost, proxyport);
+		c->socket = socket(proxyai->ai_family, SOCK_STREAM, IPPROTO_TCP);
+	}
 
 	if(c->socket == -1) {
 		logger(DEBUG_CONNECTIONS, LOG_ERR, "Creating socket for %s failed: %s", c->hostname, sockstrerror(sockerrno));
+		free_connection(c);
 		goto begin;
 	}
 
-#if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
-	int option = 1;
-	if(c->address.sa.sa_family == AF_INET6)
-		setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
+#ifdef FD_CLOEXEC
+	fcntl(c->socket, F_SETFD, FD_CLOEXEC);
 #endif
 
-	bind_to_interface(c->socket);
-
-	/* Optimize TCP settings */
+	if(proxytype != PROXY_EXEC) {
+#if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
+		int option = 1;
+		if(c->address.sa.sa_family == AF_INET6)
+			setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
+#endif
 
-	configure_tcp(c);
+		bind_to_interface(c->socket);
+	}
 
 	/* Connect */
 
-	result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
-
-	if(result == -1) {
-		if(sockinprogress(sockerrno)) {
-			c->status.connecting = true;
-			return true;
-		}
-
-		closesocket(c->socket);
+	if(!proxytype) {
+		result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
+	} else if(proxytype == PROXY_EXEC) {
+		result = 0;
+	} else {
+		result = connect(c->socket, proxyai->ai_addr, proxyai->ai_addrlen);
+		freeaddrinfo(proxyai);
+	}
 
-		logger(DEBUG_CONNECTIONS, LOG_ERR, "%s: %s", c->hostname, sockstrerror(sockerrno));
+	if(result == -1 && !sockinprogress(sockerrno)) {
+		logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not connect to %s (%s): %s", outgoing->name, c->hostname, sockstrerror(sockerrno));
+		free_connection(c);
 
 		goto begin;
 	}
 
-	finish_connecting(c);
+	/* Now that there is a working socket, fill in the rest and register this connection. */
 
-	return true;
-}
+	c->status.connecting = true;
+	c->name = xstrdup(outgoing->name);
+	c->outcipher = myself->connection->outcipher;
+	c->outdigest = myself->connection->outdigest;
+	c->outmaclength = myself->connection->outmaclength;
+	c->outcompression = myself->connection->outcompression;
+	c->last_ping_time = time(NULL);
 
-static void handle_meta_write(int sock, short events, void *data) {
-	connection_t *c = data;
+	connection_add(c);
 
-	ssize_t outlen = send(c->socket, c->outbuf.data + c->outbuf.offset, c->outbuf.len - c->outbuf.offset, 0);
-	if(outlen <= 0) {
-		logger(DEBUG_ALWAYS, LOG_ERR, "Onoes, outlen = %d (%s)", (int)outlen, strerror(errno));
-		terminate_connection(c, c->status.active);
-		return;
-	}
+	event_set(&c->inevent, c->socket, EV_READ | EV_PERSIST, handle_meta_connection_data, c);
+	event_set(&c->outevent, c->socket, EV_WRITE | EV_PERSIST, handle_meta_write, c);
+	event_add(&c->inevent, NULL);
 
-	buffer_read(&c->outbuf, outlen);
-	if(!c->outbuf.len && event_initialized(&c->outevent))
-		event_del(&c->outevent);
+	return true;
 }
 
 void setup_outgoing_connection(outgoing_t *outgoing) {
-	connection_t *c;
-	node_t *n;
-
 	if(event_initialized(&outgoing->ev))
 		event_del(&outgoing->ev);
 
-	n = lookup_node(outgoing->name);
-
-	if(n)
-		if(n->connection) {
-			logger(DEBUG_CONNECTIONS, LOG_INFO, "Already connected to %s", outgoing->name);
+	node_t *n = lookup_node(outgoing->name);
 
-			n->connection->outgoing = outgoing;
-			return;
-		}
-
-	c = new_connection();
-	c->name = xstrdup(outgoing->name);
-	c->outcipher = myself->connection->outcipher;
-	c->outdigest = myself->connection->outdigest;
-	c->outmaclength = myself->connection->outmaclength;
-	c->outcompression = myself->connection->outcompression;
+	if(n && n->connection) {
+		logger(DEBUG_CONNECTIONS, LOG_INFO, "Already connected to %s", outgoing->name);
 
-	init_configuration(&c->config_tree);
-	read_connection_config(c);
+		n->connection->outgoing = outgoing;
+		return;
+	}
 
-	outgoing->cfg = lookup_config(c->config_tree, "Address");
+	init_configuration(&outgoing->config_tree);
+	read_host_config(outgoing->config_tree, outgoing->name);
+	outgoing->cfg = lookup_config(outgoing->config_tree, "Address");
 
 	if(!outgoing->cfg) {
-		logger(DEBUG_ALWAYS, LOG_ERR, "No address specified for %s", c->name);
-		free_connection(c);
+		logger(DEBUG_ALWAYS, LOG_ERR, "No address specified for %s", outgoing->name);
 		return;
 	}
 
-	c->outgoing = outgoing;
-	c->last_ping_time = time(NULL);
-
-	connection_add(c);
-
-	if (do_outgoing_connection(c)) {
-		event_set(&c->inevent, c->socket, EV_READ | EV_PERSIST, handle_meta_connection_data, c);
-		event_set(&c->outevent, c->socket, EV_WRITE | EV_PERSIST, handle_meta_write, c);
-		event_add(&c->inevent, NULL);
-	}
+	do_outgoing_connection(outgoing);
 }
 
 /*
@@ -510,6 +564,9 @@ void handle_new_meta_connection(int sock, short events, void *data) {
 }
 
 static void free_outgoing(outgoing_t *outgoing) {
+	if(event_initialized(&outgoing->ev))
+		event_del(&outgoing->ev);
+
 	if(outgoing->ai)
 		freeaddrinfo(outgoing->ai);
 
@@ -524,8 +581,19 @@ void try_outgoing_connections(void) {
 	char *name;
 	outgoing_t *outgoing;
 	
-	outgoing_list = list_alloc((list_action_t)free_outgoing);
-			
+	/* If there is no outgoing list yet, create one. Otherwise, mark all outgoings as deleted. */
+
+	if(!outgoing_list) {
+		outgoing_list = list_alloc((list_action_t)free_outgoing);
+	} else {
+		for(list_node_t *i = outgoing_list->head; i; i = i->next) {
+			outgoing = i->data;
+			outgoing->timeout = -1;
+		}
+	}
+
+	/* Make sure there is one outgoing_t in the list for each ConnectTo. */
+
 	for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 		get_config_string(cfg, &name);
 
@@ -537,9 +605,43 @@ void try_outgoing_connections(void) {
 			continue;
 		}
 
-		outgoing = xmalloc_and_zero(sizeof *outgoing);
-		outgoing->name = name;
-		list_insert_tail(outgoing_list, outgoing);
-		setup_outgoing_connection(outgoing);
+		bool found = false;
+
+		for(list_node_t *i = outgoing_list->head; i; i = i->next) {
+			outgoing = i->data;
+			if(!strcmp(outgoing->name, name)) {
+				found = true;
+				outgoing->timeout = 0;
+				break;
+			}
+		}
+
+		if(!found) {
+			outgoing = xmalloc_and_zero(sizeof *outgoing);
+			outgoing->name = name;
+			list_insert_tail(outgoing_list, outgoing);
+			setup_outgoing_connection(outgoing);
+		}
+	}
+
+	/* Terminate any connections whose outgoing_t is to be deleted. */
+
+	for(list_node_t *node = connection_list->head, *next; node; node = next) {
+		next = node->next;
+		connection_t *c = node->data;
+		if(c->outgoing && c->outgoing->timeout == -1) {
+			c->outgoing = NULL;
+			logger(DEBUG_CONNECTIONS, LOG_INFO, "No more outgoing connection to %s", c->name);
+			terminate_connection(c, c->status.active);
+		}
+	}
+
+	/* Delete outgoing_ts for which there is no ConnectTo. */
+
+	for(list_node_t *node = outgoing_list->head, *next; node; node = next) {
+		next = node->next;
+		outgoing = node->data;
+		if(outgoing->timeout == -1)
+			list_delete_node(outgoing_list, node);
 	}
 }