2 net_socket.c -- Handle various kinds of sockets.
3 Copyright (C) 1998-2005 Ivo Timmermans,
4 2000-2008 Guus Sliepen <guus@tinc-vpn.org>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 #include "connection.h"
38 #define EINPROGRESS WSAEINPROGRESS
41 /* Needed on Mac OS/X */
43 #define SOL_TCP IPPROTO_TCP
46 int addressfamily = AF_UNSPEC;
48 int seconds_till_retry = 5;
50 listen_socket_t listen_socket[MAXSOCKETS];
55 static void configure_tcp(connection_t *c)
60 int flags = fcntl(c->socket, F_GETFL);
62 if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) {
63 logger(LOG_ERR, _("fcntl for %s: %s"), c->hostname, strerror(errno));
66 unsigned long arg = 1;
68 if(ioctlsocket(c->socket, FIONBIO, &arg) != 0) {
69 logger(LOG_ERR, _("ioctlsocket for %s: WSA error %d"), c->hostname, WSAGetLastError());
73 #if defined(SOL_TCP) && defined(TCP_NODELAY)
75 setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
78 #if defined(SOL_IP) && defined(IP_TOS) && defined(IPTOS_LOWDELAY)
79 option = IPTOS_LOWDELAY;
80 setsockopt(c->socket, SOL_IP, IP_TOS, &option, sizeof(option));
84 int setup_listen_socket(const sockaddr_t *sa)
93 nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
96 ifdebug(STATUS) logger(LOG_ERR, _("Creating metasocket failed: %s"), strerror(errno));
100 /* Optimize TCP settings */
103 setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
105 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
106 if(sa->sa.sa_family == AF_INET6)
107 setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
111 (lookup_config(config_tree, "BindToInterface"), &iface)) {
112 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
115 memset(&ifr, 0, sizeof(ifr));
116 strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
118 if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr))) {
120 logger(LOG_ERR, _("Can't bind to interface %s: %s"), iface,
125 logger(LOG_WARNING, _("BindToInterface not supported on this platform"));
129 if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
131 addrstr = sockaddr2hostname(sa);
132 logger(LOG_ERR, _("Can't bind to %s/tcp: %s"), addrstr,
140 logger(LOG_ERR, _("System call `%s' failed: %s"), "listen",
148 int setup_vpn_in_socket(const sockaddr_t *sa)
156 nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
159 logger(LOG_ERR, _("Creating UDP socket failed: %s"), strerror(errno));
165 int flags = fcntl(nfd, F_GETFL);
167 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
169 logger(LOG_ERR, _("System call `%s' failed: %s"), "fcntl",
176 unsigned long arg = 1;
177 if(ioctlsocket(nfd, FIONBIO, &arg) != 0) {
179 logger(LOG_ERR, _("Call to `%s' failed: WSA error %d"), "ioctlsocket",
187 setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
189 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
190 if(sa->sa.sa_family == AF_INET6)
191 setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
194 #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
198 if(get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice) && choice) {
199 option = IP_PMTUDISC_DO;
200 setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, &option, sizeof(option));
205 #if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
209 if(get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice) && choice) {
210 option = IPV6_PMTUDISC_DO;
211 setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, &option, sizeof(option));
216 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
221 if(get_config_string(lookup_config(config_tree, "BindToInterface"), &iface)) {
222 memset(&ifr, 0, sizeof(ifr));
223 strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
225 if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr))) {
227 logger(LOG_ERR, _("Can't bind to interface %s: %s"), iface,
235 if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
237 addrstr = sockaddr2hostname(sa);
238 logger(LOG_ERR, _("Can't bind to %s/udp: %s"), addrstr,
247 void retry_outgoing(outgoing_t *outgoing)
253 outgoing->timeout += 5;
255 if(outgoing->timeout > maxtimeout)
256 outgoing->timeout = maxtimeout;
259 event->handler = (event_handler_t) setup_outgoing_connection;
260 event->time = now + outgoing->timeout;
261 event->data = outgoing;
264 ifdebug(CONNECTIONS) logger(LOG_NOTICE,
265 _("Trying to re-establish outgoing connection in %d seconds"),
269 void finish_connecting(connection_t *c)
273 ifdebug(CONNECTIONS) logger(LOG_INFO, _("Connected to %s (%s)"), c->name, c->hostname);
277 c->last_ping_time = now;
282 void do_outgoing_connection(connection_t *c)
284 char *address, *port;
290 if(!c->outgoing->ai) {
291 if(!c->outgoing->cfg) {
292 ifdebug(CONNECTIONS) logger(LOG_ERR, _("Could not set up a meta connection to %s"),
294 c->status.remove = true;
295 retry_outgoing(c->outgoing);
299 get_config_string(c->outgoing->cfg, &address);
301 if(!get_config_string(lookup_config(c->config_tree, "Port"), &port))
302 asprintf(&port, "655");
304 c->outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
308 c->outgoing->aip = c->outgoing->ai;
309 c->outgoing->cfg = lookup_config_next(c->config_tree, c->outgoing->cfg);
312 if(!c->outgoing->aip) {
314 freeaddrinfo(c->outgoing->ai);
315 c->outgoing->ai = NULL;
319 memcpy(&c->address, c->outgoing->aip->ai_addr, c->outgoing->aip->ai_addrlen);
320 c->outgoing->aip = c->outgoing->aip->ai_next;
325 c->hostname = sockaddr2hostname(&c->address);
327 ifdebug(CONNECTIONS) logger(LOG_INFO, _("Trying to connect to %s (%s)"), c->name,
330 c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
332 if(c->socket == -1) {
333 ifdebug(CONNECTIONS) logger(LOG_ERR, _("Creating socket for %s failed: %s"), c->hostname,
339 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
341 if(c->address.sa.sa_family == AF_INET6)
342 setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
345 /* Optimize TCP settings */
351 result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
354 if(errno == EINPROGRESS
355 #if defined(WIN32) && !defined(O_NONBLOCK)
356 || WSAGetLastError() == WSAEWOULDBLOCK
359 c->status.connecting = true;
363 closesocket(c->socket);
365 ifdebug(CONNECTIONS) logger(LOG_ERR, _("%s: %s"), c->hostname, strerror(errno));
370 finish_connecting(c);
375 void setup_outgoing_connection(outgoing_t *outgoing)
382 n = lookup_node(outgoing->name);
386 ifdebug(CONNECTIONS) logger(LOG_INFO, _("Already connected to %s"), outgoing->name);
388 n->connection->outgoing = outgoing;
392 c = new_connection();
393 c->name = xstrdup(outgoing->name);
394 c->outcipher = myself->connection->outcipher;
395 c->outdigest = myself->connection->outdigest;
396 c->outmaclength = myself->connection->outmaclength;
397 c->outcompression = myself->connection->outcompression;
399 init_configuration(&c->config_tree);
400 read_connection_config(c);
402 outgoing->cfg = lookup_config(c->config_tree, "Address");
405 logger(LOG_ERR, _("No address specified for %s"), c->name);
407 free(outgoing->name);
412 c->outgoing = outgoing;
413 c->last_ping_time = now;
417 do_outgoing_connection(c);
421 accept a new tcp connect and create a
424 bool handle_new_meta_connection(int sock)
429 socklen_t len = sizeof(sa);
433 fd = accept(sock, &sa.sa, &len);
436 logger(LOG_ERR, _("Accepting a new connection failed: %s"),
443 c = new_connection();
444 c->name = xstrdup("<unknown>");
445 c->outcipher = myself->connection->outcipher;
446 c->outdigest = myself->connection->outdigest;
447 c->outmaclength = myself->connection->outmaclength;
448 c->outcompression = myself->connection->outcompression;
451 c->hostname = sockaddr2hostname(&sa);
453 c->last_ping_time = now;
455 ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Connection from %s"), c->hostname);
461 c->allow_request = ID;
467 void try_outgoing_connections(void)
469 static config_t *cfg = NULL;
471 outgoing_t *outgoing;
475 for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
476 get_config_string(cfg, &name);
478 if(!check_id(name)) {
480 _("Invalid name for outgoing connection in %s line %d"),
481 cfg->file, cfg->line);
486 outgoing = xmalloc_and_zero(sizeof(*outgoing));
487 outgoing->name = name;
488 setup_outgoing_connection(outgoing);