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>
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.
25 #include "splay_tree.h"
27 #include "connection.h"
37 #define EINPROGRESS WSAEINPROGRESS
40 /* Needed on Mac OS/X */
42 #define SOL_TCP IPPROTO_TCP
45 int addressfamily = AF_UNSPEC;
47 int seconds_till_retry = 5;
49 listen_socket_t listen_socket[MAXSOCKETS];
51 list_t *outgoing_list = NULL;
55 static void configure_tcp(connection_t *c) {
59 int flags = fcntl(c->socket, F_GETFL);
61 if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) {
62 logger(LOG_ERR, _("fcntl for %s: %s"), c->hostname, strerror(errno));
65 unsigned long arg = 1;
67 if(ioctlsocket(c->socket, FIONBIO, &arg) != 0) {
68 logger(LOG_ERR, _("ioctlsocket for %s: WSA error %d"), c->hostname, WSAGetLastError());
72 #if defined(SOL_TCP) && defined(TCP_NODELAY)
74 setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof option);
77 #if defined(SOL_IP) && defined(IP_TOS) && defined(IPTOS_LOWDELAY)
78 option = IPTOS_LOWDELAY;
79 setsockopt(c->socket, SOL_IP, IP_TOS, &option, sizeof option);
83 int setup_listen_socket(const sockaddr_t *sa) {
91 nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
94 ifdebug(STATUS) logger(LOG_ERR, _("Creating metasocket failed: %s"), strerror(errno));
98 /* Optimize TCP settings */
101 setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof option);
103 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
104 if(sa->sa.sa_family == AF_INET6)
105 setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
109 (lookup_config(config_tree, "BindToInterface"), &iface)) {
110 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
113 memset(&ifr, 0, sizeof ifr);
114 strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
116 if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof ifr)) {
118 logger(LOG_ERR, _("Can't bind to interface %s: %s"), iface,
123 logger(LOG_WARNING, _("BindToInterface not supported on this platform"));
127 if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
129 addrstr = sockaddr2hostname(sa);
130 logger(LOG_ERR, _("Can't bind to %s/tcp: %s"), addrstr,
138 logger(LOG_ERR, _("System call `%s' failed: %s"), "listen",
146 int setup_vpn_in_socket(const sockaddr_t *sa) {
153 nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
156 logger(LOG_ERR, _("Creating UDP socket failed: %s"), strerror(errno));
162 int flags = fcntl(nfd, F_GETFL);
164 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
166 logger(LOG_ERR, _("System call `%s' failed: %s"), "fcntl",
173 unsigned long arg = 1;
174 if(ioctlsocket(nfd, FIONBIO, &arg) != 0) {
176 logger(LOG_ERR, _("Call to `%s' failed: WSA error %d"), "ioctlsocket",
184 setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof option);
186 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
187 if(sa->sa.sa_family == AF_INET6)
188 setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
191 #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
192 if(myself->options & OPTION_PMTU_DISCOVERY) {
193 option = IP_PMTUDISC_DO;
194 setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, &option, sizeof(option));
198 #if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
199 if(myself->options & OPTION_PMTU_DISCOVERY) {
200 option = IPV6_PMTUDISC_DO;
201 setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, &option, sizeof(option));
205 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
210 if(get_config_string(lookup_config(config_tree, "BindToInterface"), &iface)) {
211 memset(&ifr, 0, sizeof ifr);
212 strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
214 if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof ifr)) {
216 logger(LOG_ERR, _("Can't bind to interface %s: %s"), iface,
224 if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
226 addrstr = sockaddr2hostname(sa);
227 logger(LOG_ERR, _("Can't bind to %s/udp: %s"), addrstr,
236 static void retry_outgoing_handler(int fd, short events, void *data) {
237 setup_outgoing_connection(data);
240 void retry_outgoing(outgoing_t *outgoing) {
243 outgoing->timeout += 5;
245 if(outgoing->timeout > maxtimeout)
246 outgoing->timeout = maxtimeout;
248 timeout_set(&outgoing->ev, retry_outgoing_handler, outgoing);
249 event_add(&outgoing->ev, &(struct timeval){outgoing->timeout, 0});
251 ifdebug(CONNECTIONS) logger(LOG_NOTICE,
252 _("Trying to re-establish outgoing connection in %d seconds"),
256 void finish_connecting(connection_t *c) {
259 ifdebug(CONNECTIONS) logger(LOG_INFO, _("Connected to %s (%s)"), c->name, c->hostname);
263 c->last_ping_time = time(NULL);
264 c->status.connecting = false;
269 void do_outgoing_connection(connection_t *c) {
270 char *address, *port;
276 if(!c->outgoing->ai) {
277 if(!c->outgoing->cfg) {
278 ifdebug(CONNECTIONS) logger(LOG_ERR, _("Could not set up a meta connection to %s"),
280 retry_outgoing(c->outgoing);
286 get_config_string(c->outgoing->cfg, &address);
288 if(!get_config_string(lookup_config(c->config_tree, "Port"), &port))
289 asprintf(&port, "655");
291 c->outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
295 c->outgoing->aip = c->outgoing->ai;
296 c->outgoing->cfg = lookup_config_next(c->config_tree, c->outgoing->cfg);
299 if(!c->outgoing->aip) {
301 freeaddrinfo(c->outgoing->ai);
302 c->outgoing->ai = NULL;
306 memcpy(&c->address, c->outgoing->aip->ai_addr, c->outgoing->aip->ai_addrlen);
307 c->outgoing->aip = c->outgoing->aip->ai_next;
312 c->hostname = sockaddr2hostname(&c->address);
314 ifdebug(CONNECTIONS) logger(LOG_INFO, _("Trying to connect to %s (%s)"), c->name,
317 c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
319 if(c->socket == -1) {
320 ifdebug(CONNECTIONS) logger(LOG_ERR, _("Creating socket for %s failed: %s"), c->hostname,
326 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
328 if(c->address.sa.sa_family == AF_INET6)
329 setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
332 /* Optimize TCP settings */
338 result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
341 if(errno == EINPROGRESS
342 #if defined(WIN32) && !defined(O_NONBLOCK)
343 || WSAGetLastError() == WSAEWOULDBLOCK
346 c->status.connecting = true;
350 closesocket(c->socket);
352 ifdebug(CONNECTIONS) logger(LOG_ERR, _("%s: %s"), c->hostname, strerror(errno));
357 finish_connecting(c);
362 void handle_meta_read(struct bufferevent *event, void *data) {
363 logger(LOG_EMERG, _("handle_meta_read() called"));
367 void handle_meta_write(struct bufferevent *event, void *data) {
368 ifdebug(META) logger(LOG_DEBUG, _("handle_meta_write() called"));
371 void handle_meta_connection_error(struct bufferevent *event, short what, void *data) {
372 connection_t *c = data;
373 logger(LOG_EMERG, _("handle_meta_connection_error() called: %d: %s"), what, strerror(errno));
374 terminate_connection(c, c->status.active);
377 void setup_outgoing_connection(outgoing_t *outgoing) {
383 n = lookup_node(outgoing->name);
387 ifdebug(CONNECTIONS) logger(LOG_INFO, _("Already connected to %s"), outgoing->name);
389 n->connection->outgoing = outgoing;
393 c = new_connection();
394 c->name = xstrdup(outgoing->name);
395 c->outcipher = myself->connection->outcipher;
396 c->outdigest = myself->connection->outdigest;
397 c->outmaclength = myself->connection->outmaclength;
398 c->outcompression = myself->connection->outcompression;
400 init_configuration(&c->config_tree);
401 read_connection_config(c);
403 outgoing->cfg = lookup_config(c->config_tree, "Address");
406 logger(LOG_ERR, _("No address specified for %s"), c->name);
411 c->outgoing = outgoing;
412 c->last_ping_time = time(NULL);
416 do_outgoing_connection(c);
418 event_set(&c->inevent, c->socket, EV_READ | EV_PERSIST, handle_meta_connection_data, c);
419 event_add(&c->inevent, NULL);
420 c->buffer = bufferevent_new(c->socket, handle_meta_read, handle_meta_write, handle_meta_connection_error, c);
422 logger(LOG_EMERG, _("bufferevent_new() failed: %s"), strerror(errno));
425 bufferevent_disable(c->buffer, EV_READ);
429 accept a new tcp connect and create a
432 void handle_new_meta_connection(int sock, short events, void *data) {
436 socklen_t len = sizeof sa;
440 fd = accept(sock, &sa.sa, &len);
443 logger(LOG_ERR, _("Accepting a new connection failed: %s"), strerror(errno));
449 c = new_connection();
450 c->name = xstrdup("<unknown>");
451 c->outcipher = myself->connection->outcipher;
452 c->outdigest = myself->connection->outdigest;
453 c->outmaclength = myself->connection->outmaclength;
454 c->outcompression = myself->connection->outcompression;
457 c->hostname = sockaddr2hostname(&sa);
459 c->last_ping_time = time(NULL);
461 ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Connection from %s"), c->hostname);
463 event_set(&c->inevent, c->socket, EV_READ | EV_PERSIST, handle_meta_connection_data, c);
464 event_add(&c->inevent, NULL);
465 c->buffer = bufferevent_new(c->socket, NULL, handle_meta_write, handle_meta_connection_error, c);
467 logger(LOG_EMERG, _("bufferevent_new() failed: %s"), strerror(errno));
470 bufferevent_disable(c->buffer, EV_READ);
476 c->allow_request = ID;
480 void free_outgoing(outgoing_t *outgoing) {
482 freeaddrinfo(outgoing->ai);
485 free(outgoing->name);
490 void try_outgoing_connections(void)
492 static config_t *cfg = NULL;
494 outgoing_t *outgoing;
501 for(node = connection_tree->head; node; node = node->next) {
506 list_delete_list(outgoing_list);
509 outgoing_list = list_alloc((list_action_t)free_outgoing);
511 for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
512 get_config_string(cfg, &name);
514 if(!check_id(name)) {
516 _("Invalid name for outgoing connection in %s line %d"),
517 cfg->file, cfg->line);
522 outgoing = xmalloc_and_zero(sizeof *outgoing);
523 outgoing->name = name;
524 list_insert_tail(outgoing_list, outgoing);
525 setup_outgoing_connection(outgoing);