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 2006 Scott Lamb <slamb@slamb.org>
6 2009 Florian Forster <octo@verplant.org>
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
25 #include "splay_tree.h"
27 #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 static void retry_outgoing_handler(int fd, short events, void *data) {
308 setup_outgoing_connection(data);
311 void retry_outgoing(outgoing_t *outgoing) {
312 outgoing->timeout += 5;
314 if(outgoing->timeout > maxtimeout)
315 outgoing->timeout = maxtimeout;
317 timeout_set(&outgoing->ev, retry_outgoing_handler, outgoing);
318 event_add(&outgoing->ev, &(struct timeval){outgoing->timeout, 0});
320 ifdebug(CONNECTIONS) logger(LOG_NOTICE,
321 "Trying to re-establish outgoing connection in %d seconds",
325 void finish_connecting(connection_t *c) {
326 ifdebug(CONNECTIONS) logger(LOG_INFO, "Connected to %s (%s)", c->name, c->hostname);
330 c->last_ping_time = time(NULL);
331 c->status.connecting = false;
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 retry_outgoing(c->outgoing);
351 get_config_string(c->outgoing->cfg, &address);
353 if(!get_config_string(lookup_config(c->config_tree, "Port"), &port))
354 xasprintf(&port, "655");
356 c->outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
360 c->outgoing->aip = c->outgoing->ai;
361 c->outgoing->cfg = lookup_config_next(c->config_tree, c->outgoing->cfg);
364 if(!c->outgoing->aip) {
366 freeaddrinfo(c->outgoing->ai);
367 c->outgoing->ai = NULL;
371 memcpy(&c->address, c->outgoing->aip->ai_addr, c->outgoing->aip->ai_addrlen);
372 c->outgoing->aip = c->outgoing->aip->ai_next;
377 c->hostname = sockaddr2hostname(&c->address);
379 ifdebug(CONNECTIONS) logger(LOG_INFO, "Trying to connect to %s (%s)", c->name,
382 c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
384 if(c->socket == -1) {
385 ifdebug(CONNECTIONS) logger(LOG_ERR, "Creating socket for %s failed: %s", c->hostname,
391 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
393 if(c->address.sa.sa_family == AF_INET6)
394 setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
397 bind_to_interface(c->socket);
400 /* Optimize TCP settings */
406 result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
409 if(errno == EINPROGRESS
410 #if defined(WIN32) && !defined(O_NONBLOCK)
411 || WSAGetLastError() == WSAEWOULDBLOCK
414 c->status.connecting = true;
418 closesocket(c->socket);
420 ifdebug(CONNECTIONS) logger(LOG_ERR, "%s: %s", c->hostname, strerror(errno));
425 finish_connecting(c);
430 void handle_meta_read(struct bufferevent *event, void *data) {
431 logger(LOG_EMERG, "handle_meta_read() called");
435 void handle_meta_write(struct bufferevent *event, void *data) {
436 ifdebug(META) logger(LOG_DEBUG, "handle_meta_write() called");
439 void handle_meta_connection_error(struct bufferevent *event, short what, void *data) {
440 connection_t *c = data;
441 logger(LOG_EMERG, "handle_meta_connection_error() called: %d: %s", what, strerror(errno));
442 terminate_connection(c, c->status.active);
445 void setup_outgoing_connection(outgoing_t *outgoing) {
449 n = lookup_node(outgoing->name);
453 ifdebug(CONNECTIONS) logger(LOG_INFO, "Already connected to %s", outgoing->name);
455 n->connection->outgoing = outgoing;
459 c = new_connection();
460 c->name = xstrdup(outgoing->name);
461 c->outcipher = myself->connection->outcipher;
462 c->outdigest = myself->connection->outdigest;
463 c->outmaclength = myself->connection->outmaclength;
464 c->outcompression = myself->connection->outcompression;
466 init_configuration(&c->config_tree);
467 read_connection_config(c);
469 outgoing->cfg = lookup_config(c->config_tree, "Address");
472 logger(LOG_ERR, "No address specified for %s", c->name);
477 c->outgoing = outgoing;
478 c->last_ping_time = time(NULL);
482 do_outgoing_connection(c);
484 event_set(&c->inevent, c->socket, EV_READ | EV_PERSIST, handle_meta_connection_data, c);
485 event_add(&c->inevent, NULL);
486 c->buffer = bufferevent_new(c->socket, handle_meta_read, handle_meta_write, handle_meta_connection_error, c);
488 logger(LOG_EMERG, "bufferevent_new() failed: %s", strerror(errno));
491 bufferevent_disable(c->buffer, EV_READ);
495 accept a new tcp connect and create a
498 void handle_new_meta_connection(int sock, short events, void *data) {
502 socklen_t len = sizeof sa;
504 fd = accept(sock, &sa.sa, &len);
507 logger(LOG_ERR, "Accepting a new connection failed: %s", strerror(errno));
513 c = new_connection();
514 c->name = xstrdup("<unknown>");
515 c->outcipher = myself->connection->outcipher;
516 c->outdigest = myself->connection->outdigest;
517 c->outmaclength = myself->connection->outmaclength;
518 c->outcompression = myself->connection->outcompression;
521 c->hostname = sockaddr2hostname(&sa);
523 c->last_ping_time = time(NULL);
525 ifdebug(CONNECTIONS) logger(LOG_NOTICE, "Connection from %s", c->hostname);
527 event_set(&c->inevent, c->socket, EV_READ | EV_PERSIST, handle_meta_connection_data, c);
528 event_add(&c->inevent, NULL);
529 c->buffer = bufferevent_new(c->socket, NULL, handle_meta_write, handle_meta_connection_error, c);
531 logger(LOG_EMERG, "bufferevent_new() failed: %s", strerror(errno));
534 bufferevent_disable(c->buffer, EV_READ);
540 c->allow_request = ID;
544 void free_outgoing(outgoing_t *outgoing) {
546 freeaddrinfo(outgoing->ai);
549 free(outgoing->name);
554 void try_outgoing_connections(void) {
555 static config_t *cfg = NULL;
557 outgoing_t *outgoing;
562 for(node = connection_tree->head; node; node = node->next) {
567 list_delete_list(outgoing_list);
570 outgoing_list = list_alloc((list_action_t)free_outgoing);
572 for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
573 get_config_string(cfg, &name);
575 if(!check_id(name)) {
577 "Invalid name for outgoing connection in %s line %d",
578 cfg->file, cfg->line);
583 outgoing = xmalloc_and_zero(sizeof *outgoing);
584 outgoing->name = name;
585 list_insert_tail(outgoing_list, outgoing);
586 setup_outgoing_connection(outgoing);