2 net_socket.c -- Handle various kinds of sockets.
3 Copyright (C) 1998-2005 Ivo Timmermans,
4 2000-2009 Guus Sliepen <guus@tinc-vpn.org>
5 2009 Florian Forster <octo@verplant.org>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License along
18 with this program; if not, write to the Free Software Foundation, Inc.,
19 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
26 #include "connection.h"
39 #define EINPROGRESS WSAEINPROGRESS
42 /* Needed on Mac OS/X */
44 #define SOL_TCP IPPROTO_TCP
47 int addressfamily = AF_UNSPEC;
49 int seconds_till_retry = 5;
51 listen_socket_t listen_socket[MAXSOCKETS];
53 list_t *outgoing_list = NULL;
57 static void configure_tcp(connection_t *c) {
61 int flags = fcntl(c->socket, F_GETFL);
63 if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) {
64 logger(LOG_ERR, "fcntl for %s: %s", c->hostname, strerror(errno));
67 unsigned long arg = 1;
69 if(ioctlsocket(c->socket, FIONBIO, &arg) != 0) {
70 logger(LOG_ERR, "ioctlsocket for %s: WSA error %d", c->hostname, WSAGetLastError());
74 #if defined(SOL_TCP) && defined(TCP_NODELAY)
76 setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
79 #if defined(SOL_IP) && defined(IP_TOS) && defined(IPTOS_LOWDELAY)
80 option = IPTOS_LOWDELAY;
81 setsockopt(c->socket, SOL_IP, IP_TOS, &option, sizeof(option));
85 static bool bind_to_interface(int sd) {
88 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
91 #endif /* defined(SOL_SOCKET) && defined(SO_BINDTODEVICE) */
93 if(!get_config_string (lookup_config (config_tree, "BindToInterface"), &iface))
96 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
97 memset(&ifr, 0, sizeof(ifr));
98 strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
99 ifr.ifr_ifrn.ifrn_name[IFNAMSIZ - 1] = 0;
101 status = setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
103 logger(LOG_ERR, "Can't bind to interface %s: %s", iface,
107 #else /* if !defined(SOL_SOCKET) || !defined(SO_BINDTODEVICE) */
108 logger(LOG_WARNING, "%s not supported on this platform", "BindToInterface");
114 static bool bind_to_address(connection_t *c) {
116 struct addrinfo *ai_list;
117 struct addrinfo *ai_ptr;
118 struct addrinfo ai_hints;
122 assert(c->socket >= 0);
125 if(!get_config_string(lookup_config(config_tree, "BindToAddress"),
129 assert(node != NULL);
131 memset(&ai_hints, 0, sizeof(ai_hints));
132 ai_hints.ai_family = c->address.sa.sa_family;
133 /* We're called from `do_outgoing_connection' only. */
134 ai_hints.ai_socktype = SOCK_STREAM;
135 ai_hints.ai_protocol = IPPROTO_TCP;
139 status = getaddrinfo(node, /* service = */ NULL,
140 &ai_hints, &ai_list);
143 logger(LOG_WARNING, "Error looking up %s port %s: %s",
144 node, "any", gai_strerror(status));
147 assert(ai_list != NULL);
150 for(ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next) {
151 status = bind(c->socket,
152 ai_list->ai_addr, ai_list->ai_addrlen);
159 logger(LOG_ERR, "Can't bind to %s/tcp: %s", node,
161 } else ifdebug(CONNECTIONS) {
162 logger(LOG_DEBUG, "Successfully bound outgoing "
163 "TCP socket to %s", node);
167 freeaddrinfo(ai_list);
169 return status ? false : true;
172 int setup_listen_socket(const sockaddr_t *sa) {
178 nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
181 ifdebug(STATUS) logger(LOG_ERR, "Creating metasocket failed: %s", strerror(errno));
185 /* Optimize TCP settings */
188 setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
190 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
191 if(sa->sa.sa_family == AF_INET6)
192 setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
196 (lookup_config(config_tree, "BindToInterface"), &iface)) {
197 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
200 memset(&ifr, 0, sizeof(ifr));
201 strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
203 if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr))) {
205 logger(LOG_ERR, "Can't bind to interface %s: %s", iface,
210 logger(LOG_WARNING, "%s not supported on this platform", "BindToInterface");
214 if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
216 addrstr = sockaddr2hostname(sa);
217 logger(LOG_ERR, "Can't bind to %s/tcp: %s", addrstr,
225 logger(LOG_ERR, "System call `%s' failed: %s", "listen",
233 int setup_vpn_in_socket(const sockaddr_t *sa) {
238 nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
241 logger(LOG_ERR, "Creating UDP socket failed: %s", strerror(errno));
247 int flags = fcntl(nfd, F_GETFL);
249 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
251 logger(LOG_ERR, "System call `%s' failed: %s", "fcntl",
258 unsigned long arg = 1;
259 if(ioctlsocket(nfd, FIONBIO, &arg) != 0) {
261 logger(LOG_ERR, "Call to `%s' failed: WSA error %d", "ioctlsocket",
269 setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
271 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
272 if(sa->sa.sa_family == AF_INET6)
273 setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
276 #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
277 if(myself->options & OPTION_PMTU_DISCOVERY) {
278 option = IP_PMTUDISC_DO;
279 setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, &option, sizeof(option));
283 #if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
284 if(myself->options & OPTION_PMTU_DISCOVERY) {
285 option = IPV6_PMTUDISC_DO;
286 setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, &option, sizeof(option));
290 if (!bind_to_interface(nfd)) {
295 if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
297 addrstr = sockaddr2hostname(sa);
298 logger(LOG_ERR, "Can't bind to %s/udp: %s", addrstr,
305 } /* int setup_vpn_in_socket */
307 void retry_outgoing(outgoing_t *outgoing) {
310 outgoing->timeout += 5;
312 if(outgoing->timeout > maxtimeout)
313 outgoing->timeout = maxtimeout;
316 event->handler = (event_handler_t) setup_outgoing_connection;
317 event->time = now + outgoing->timeout;
318 event->data = outgoing;
321 ifdebug(CONNECTIONS) logger(LOG_NOTICE,
322 "Trying to re-establish outgoing connection in %d seconds",
326 void finish_connecting(connection_t *c) {
327 ifdebug(CONNECTIONS) logger(LOG_INFO, "Connected to %s (%s)", c->name, c->hostname);
331 c->last_ping_time = now;
336 void do_outgoing_connection(connection_t *c) {
337 char *address, *port;
341 if(!c->outgoing->ai) {
342 if(!c->outgoing->cfg) {
343 ifdebug(CONNECTIONS) logger(LOG_ERR, "Could not set up a meta connection to %s",
345 c->status.remove = true;
346 retry_outgoing(c->outgoing);
350 get_config_string(c->outgoing->cfg, &address);
352 if(!get_config_string(lookup_config(c->config_tree, "Port"), &port))
353 xasprintf(&port, "655");
355 c->outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
359 c->outgoing->aip = c->outgoing->ai;
360 c->outgoing->cfg = lookup_config_next(c->config_tree, c->outgoing->cfg);
363 if(!c->outgoing->aip) {
365 freeaddrinfo(c->outgoing->ai);
366 c->outgoing->ai = NULL;
370 memcpy(&c->address, c->outgoing->aip->ai_addr, c->outgoing->aip->ai_addrlen);
371 c->outgoing->aip = c->outgoing->aip->ai_next;
376 c->hostname = sockaddr2hostname(&c->address);
378 ifdebug(CONNECTIONS) logger(LOG_INFO, "Trying to connect to %s (%s)", c->name,
381 c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
383 if(c->socket == -1) {
384 ifdebug(CONNECTIONS) logger(LOG_ERR, "Creating socket for %s failed: %s", c->hostname,
390 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
392 if(c->address.sa.sa_family == AF_INET6)
393 setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
396 bind_to_interface(c->socket);
399 /* Optimize TCP settings */
405 result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
408 if(errno == EINPROGRESS
409 #if defined(WIN32) && !defined(O_NONBLOCK)
410 || WSAGetLastError() == WSAEWOULDBLOCK
413 c->status.connecting = true;
417 closesocket(c->socket);
419 ifdebug(CONNECTIONS) logger(LOG_ERR, "%s: %s", c->hostname, strerror(errno));
424 finish_connecting(c);
429 void setup_outgoing_connection(outgoing_t *outgoing) {
433 n = lookup_node(outgoing->name);
437 ifdebug(CONNECTIONS) logger(LOG_INFO, "Already connected to %s", outgoing->name);
439 n->connection->outgoing = outgoing;
443 c = new_connection();
444 c->name = xstrdup(outgoing->name);
445 c->outcipher = myself->connection->outcipher;
446 c->outdigest = myself->connection->outdigest;
447 c->outmaclength = myself->connection->outmaclength;
448 c->outcompression = myself->connection->outcompression;
450 init_configuration(&c->config_tree);
451 read_connection_config(c);
453 outgoing->cfg = lookup_config(c->config_tree, "Address");
456 logger(LOG_ERR, "No address specified for %s", c->name);
461 c->outgoing = outgoing;
462 c->last_ping_time = now;
466 do_outgoing_connection(c);
470 accept a new tcp connect and create a
473 bool handle_new_meta_connection(int sock) {
477 socklen_t len = sizeof(sa);
479 fd = accept(sock, &sa.sa, &len);
482 logger(LOG_ERR, "Accepting a new connection failed: %s",
489 c = new_connection();
490 c->name = xstrdup("<unknown>");
491 c->outcipher = myself->connection->outcipher;
492 c->outdigest = myself->connection->outdigest;
493 c->outmaclength = myself->connection->outmaclength;
494 c->outcompression = myself->connection->outcompression;
497 c->hostname = sockaddr2hostname(&sa);
499 c->last_ping_time = now;
501 ifdebug(CONNECTIONS) logger(LOG_NOTICE, "Connection from %s", c->hostname);
507 c->allow_request = ID;
513 void free_outgoing(outgoing_t *outgoing) {
515 freeaddrinfo(outgoing->ai);
518 free(outgoing->name);
523 void try_outgoing_connections(void) {
524 static config_t *cfg = NULL;
526 outgoing_t *outgoing;
531 for(node = connection_tree->head; node; node = node->next) {
536 list_delete_list(outgoing_list);
539 outgoing_list = list_alloc((list_action_t)free_outgoing);
541 for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
542 get_config_string(cfg, &name);
544 if(!check_id(name)) {
546 "Invalid name for outgoing connection in %s line %d",
547 cfg->file, cfg->line);
552 outgoing = xmalloc_and_zero(sizeof(*outgoing));
553 outgoing->name = name;
554 list_insert_tail(outgoing_list, outgoing);
555 setup_outgoing_connection(outgoing);