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) {
180 nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
183 ifdebug(STATUS) logger(LOG_ERR, _("Creating metasocket failed: %s"), strerror(errno));
187 /* Optimize TCP settings */
190 setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
192 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
193 if(sa->sa.sa_family == AF_INET6)
194 setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
198 (lookup_config(config_tree, "BindToInterface"), &iface)) {
199 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
202 memset(&ifr, 0, sizeof(ifr));
203 strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
205 if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr))) {
207 logger(LOG_ERR, _("Can't bind to interface %s: %s"), iface,
212 logger(LOG_WARNING, _("%s not supported on this platform"), "BindToInterface");
216 if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
218 addrstr = sockaddr2hostname(sa);
219 logger(LOG_ERR, _("Can't bind to %s/tcp: %s"), addrstr,
227 logger(LOG_ERR, _("System call `%s' failed: %s"), "listen",
235 int setup_vpn_in_socket(const sockaddr_t *sa) {
242 nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
245 logger(LOG_ERR, _("Creating UDP socket failed: %s"), strerror(errno));
251 int flags = fcntl(nfd, F_GETFL);
253 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
255 logger(LOG_ERR, _("System call `%s' failed: %s"), "fcntl",
262 unsigned long arg = 1;
263 if(ioctlsocket(nfd, FIONBIO, &arg) != 0) {
265 logger(LOG_ERR, _("Call to `%s' failed: WSA error %d"), "ioctlsocket",
273 setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
275 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
276 if(sa->sa.sa_family == AF_INET6)
277 setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
280 #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
281 if(myself->options & OPTION_PMTU_DISCOVERY) {
282 option = IP_PMTUDISC_DO;
283 setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, &option, sizeof(option));
287 #if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
288 if(myself->options & OPTION_PMTU_DISCOVERY) {
289 option = IPV6_PMTUDISC_DO;
290 setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, &option, sizeof(option));
294 if (!bind_to_interface(nfd)) {
299 if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
301 addrstr = sockaddr2hostname(sa);
302 logger(LOG_ERR, _("Can't bind to %s/udp: %s"), addrstr,
309 } /* int setup_vpn_in_socket */
311 void retry_outgoing(outgoing_t *outgoing) {
316 outgoing->timeout += 5;
318 if(outgoing->timeout > maxtimeout)
319 outgoing->timeout = maxtimeout;
322 event->handler = (event_handler_t) setup_outgoing_connection;
323 event->time = now + outgoing->timeout;
324 event->data = outgoing;
327 ifdebug(CONNECTIONS) logger(LOG_NOTICE,
328 _("Trying to re-establish outgoing connection in %d seconds"),
332 void finish_connecting(connection_t *c) {
335 ifdebug(CONNECTIONS) logger(LOG_INFO, _("Connected to %s (%s)"), c->name, c->hostname);
339 c->last_ping_time = now;
344 void do_outgoing_connection(connection_t *c) {
345 char *address, *port;
351 if(!c->outgoing->ai) {
352 if(!c->outgoing->cfg) {
353 ifdebug(CONNECTIONS) logger(LOG_ERR, _("Could not set up a meta connection to %s"),
355 c->status.remove = true;
356 retry_outgoing(c->outgoing);
360 get_config_string(c->outgoing->cfg, &address);
362 if(!get_config_string(lookup_config(c->config_tree, "Port"), &port))
363 xasprintf(&port, "655");
365 c->outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
369 c->outgoing->aip = c->outgoing->ai;
370 c->outgoing->cfg = lookup_config_next(c->config_tree, c->outgoing->cfg);
373 if(!c->outgoing->aip) {
375 freeaddrinfo(c->outgoing->ai);
376 c->outgoing->ai = NULL;
380 memcpy(&c->address, c->outgoing->aip->ai_addr, c->outgoing->aip->ai_addrlen);
381 c->outgoing->aip = c->outgoing->aip->ai_next;
386 c->hostname = sockaddr2hostname(&c->address);
388 ifdebug(CONNECTIONS) logger(LOG_INFO, _("Trying to connect to %s (%s)"), c->name,
391 c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
393 if(c->socket == -1) {
394 ifdebug(CONNECTIONS) logger(LOG_ERR, _("Creating socket for %s failed: %s"), c->hostname,
400 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
402 if(c->address.sa.sa_family == AF_INET6)
403 setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
406 bind_to_interface(c->socket);
409 /* Optimize TCP settings */
415 result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
418 if(errno == EINPROGRESS
419 #if defined(WIN32) && !defined(O_NONBLOCK)
420 || WSAGetLastError() == WSAEWOULDBLOCK
423 c->status.connecting = true;
427 closesocket(c->socket);
429 ifdebug(CONNECTIONS) logger(LOG_ERR, _("%s: %s"), c->hostname, strerror(errno));
434 finish_connecting(c);
439 void setup_outgoing_connection(outgoing_t *outgoing) {
445 n = lookup_node(outgoing->name);
449 ifdebug(CONNECTIONS) logger(LOG_INFO, _("Already connected to %s"), outgoing->name);
451 n->connection->outgoing = outgoing;
455 c = new_connection();
456 c->name = xstrdup(outgoing->name);
457 c->outcipher = myself->connection->outcipher;
458 c->outdigest = myself->connection->outdigest;
459 c->outmaclength = myself->connection->outmaclength;
460 c->outcompression = myself->connection->outcompression;
462 init_configuration(&c->config_tree);
463 read_connection_config(c);
465 outgoing->cfg = lookup_config(c->config_tree, "Address");
468 logger(LOG_ERR, _("No address specified for %s"), c->name);
473 c->outgoing = outgoing;
474 c->last_ping_time = now;
478 do_outgoing_connection(c);
482 accept a new tcp connect and create a
485 bool handle_new_meta_connection(int sock) {
489 socklen_t len = sizeof(sa);
493 fd = accept(sock, &sa.sa, &len);
496 logger(LOG_ERR, _("Accepting a new connection failed: %s"),
503 c = new_connection();
504 c->name = xstrdup("<unknown>");
505 c->outcipher = myself->connection->outcipher;
506 c->outdigest = myself->connection->outdigest;
507 c->outmaclength = myself->connection->outmaclength;
508 c->outcompression = myself->connection->outcompression;
511 c->hostname = sockaddr2hostname(&sa);
513 c->last_ping_time = now;
515 ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Connection from %s"), c->hostname);
521 c->allow_request = ID;
527 void free_outgoing(outgoing_t *outgoing) {
529 freeaddrinfo(outgoing->ai);
532 free(outgoing->name);
537 void try_outgoing_connections(void) {
538 static config_t *cfg = NULL;
540 outgoing_t *outgoing;
547 for(node = connection_tree->head; node; node = node->next) {
552 list_delete_list(outgoing_list);
555 outgoing_list = list_alloc((list_action_t)free_outgoing);
557 for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
558 get_config_string(cfg, &name);
560 if(!check_id(name)) {
562 _("Invalid name for outgoing connection in %s line %d"),
563 cfg->file, cfg->line);
568 outgoing = xmalloc_and_zero(sizeof(*outgoing));
569 outgoing->name = name;
570 list_insert_tail(outgoing_list, outgoing);
571 setup_outgoing_connection(outgoing);