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[tinc] / src / net_socket.c
1 /*
2     net_socket.c -- Handle various kinds of sockets.
3     Copyright (C) 1998-2005 Ivo Timmermans,
4                   2000-2013 Guus Sliepen <guus@tinc-vpn.org>
5                   2006      Scott Lamb <slamb@slamb.org>
6                   2009      Florian Forster <octo@verplant.org>
7
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.
12
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.
17
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.
21 */
22
23 #include "system.h"
24
25 #include "conf.h"
26 #include "connection.h"
27 #include "control_common.h"
28 #include "list.h"
29 #include "logger.h"
30 #include "meta.h"
31 #include "names.h"
32 #include "net.h"
33 #include "netutl.h"
34 #include "protocol.h"
35 #include "utils.h"
36 #include "xalloc.h"
37
38 /* Needed on Mac OS/X */
39 #ifndef SOL_TCP
40 #define SOL_TCP IPPROTO_TCP
41 #endif
42
43 int addressfamily = AF_UNSPEC;
44 int maxtimeout = 900;
45 int seconds_till_retry = 5;
46 int udp_rcvbuf = 0;
47 int udp_sndbuf = 0;
48
49 listen_socket_t listen_socket[MAXSOCKETS];
50 int listen_sockets;
51 #ifndef HAVE_MINGW
52 io_t unix_socket;
53 #endif
54 list_t *outgoing_list = NULL;
55
56 /* Setup sockets */
57
58 static void configure_tcp(connection_t *c) {
59         int option;
60
61 #ifdef O_NONBLOCK
62         int flags = fcntl(c->socket, F_GETFL);
63
64         if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) {
65                 logger(DEBUG_ALWAYS, LOG_ERR, "fcntl for %s: %s", c->hostname, strerror(errno));
66         }
67 #elif defined(WIN32)
68         unsigned long arg = 1;
69
70         if(ioctlsocket(c->socket, FIONBIO, &arg) != 0) {
71                 logger(DEBUG_ALWAYS, LOG_ERR, "ioctlsocket for %s: %s", c->hostname, sockstrerror(sockerrno));
72         }
73 #endif
74
75 #if defined(SOL_TCP) && defined(TCP_NODELAY)
76         option = 1;
77         setsockopt(c->socket, SOL_TCP, TCP_NODELAY, (void *)&option, sizeof option);
78 #endif
79
80 #if defined(SOL_IP) && defined(IP_TOS) && defined(IPTOS_LOWDELAY)
81         option = IPTOS_LOWDELAY;
82         setsockopt(c->socket, SOL_IP, IP_TOS, (void *)&option, sizeof option);
83 #endif
84 }
85
86 static bool bind_to_interface(int sd) {
87         char *iface;
88
89 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
90         struct ifreq ifr;
91         int status;
92 #endif /* defined(SOL_SOCKET) && defined(SO_BINDTODEVICE) */
93
94         if(!get_config_string (lookup_config (config_tree, "BindToInterface"), &iface))
95                 return true;
96
97 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
98         memset(&ifr, 0, sizeof(ifr));
99         strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
100         ifr.ifr_ifrn.ifrn_name[IFNAMSIZ - 1] = 0;
101
102         status = setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr));
103         if(status) {
104                 logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to interface %s: %s", iface,
105                                 strerror(errno));
106                 return false;
107         }
108 #else /* if !defined(SOL_SOCKET) || !defined(SO_BINDTODEVICE) */
109         logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "BindToInterface");
110 #endif
111
112         return true;
113 }
114
115 int setup_listen_socket(const sockaddr_t *sa) {
116         int nfd;
117         char *addrstr;
118         int option;
119         char *iface;
120
121         nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
122
123         if(nfd < 0) {
124                 logger(DEBUG_STATUS, LOG_ERR, "Creating metasocket failed: %s", sockstrerror(sockerrno));
125                 return -1;
126         }
127
128 #ifdef FD_CLOEXEC
129         fcntl(nfd, F_SETFD, FD_CLOEXEC);
130 #endif
131
132         /* Optimize TCP settings */
133
134         option = 1;
135         setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof option);
136
137 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
138         if(sa->sa.sa_family == AF_INET6)
139                 setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
140 #endif
141
142         if(get_config_string
143            (lookup_config(config_tree, "BindToInterface"), &iface)) {
144 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
145                 struct ifreq ifr;
146
147                 memset(&ifr, 0, sizeof ifr);
148                 strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
149
150                 if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof ifr)) {
151                         closesocket(nfd);
152                         logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to interface %s: %s", iface,
153                                    strerror(sockerrno));
154                         return -1;
155                 }
156 #else
157                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "BindToInterface");
158 #endif
159         }
160
161         if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
162                 closesocket(nfd);
163                 addrstr = sockaddr2hostname(sa);
164                 logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to %s/tcp: %s", addrstr, sockstrerror(sockerrno));
165                 free(addrstr);
166                 return -1;
167         }
168
169         if(listen(nfd, 3)) {
170                 closesocket(nfd);
171                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "listen", sockstrerror(sockerrno));
172                 return -1;
173         }
174
175         return nfd;
176 }
177
178 int setup_vpn_in_socket(const sockaddr_t *sa) {
179         int nfd;
180         char *addrstr;
181         int option;
182
183         nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
184
185         if(nfd < 0) {
186                 logger(DEBUG_ALWAYS, LOG_ERR, "Creating UDP socket failed: %s", sockstrerror(sockerrno));
187                 return -1;
188         }
189
190 #ifdef FD_CLOEXEC
191         fcntl(nfd, F_SETFD, FD_CLOEXEC);
192 #endif
193
194 #ifdef O_NONBLOCK
195         {
196                 int flags = fcntl(nfd, F_GETFL);
197
198                 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
199                         closesocket(nfd);
200                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "fcntl",
201                                    strerror(errno));
202                         return -1;
203                 }
204         }
205 #elif defined(WIN32)
206         {
207                 unsigned long arg = 1;
208                 if(ioctlsocket(nfd, FIONBIO, &arg) != 0) {
209                         closesocket(nfd);
210                         logger(DEBUG_ALWAYS, LOG_ERR, "Call to `%s' failed: %s", "ioctlsocket", sockstrerror(sockerrno));
211                         return -1;
212                 }
213         }
214 #endif
215
216         option = 1;
217         setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof option);
218         setsockopt(nfd, SOL_SOCKET, SO_BROADCAST, (void *)&option, sizeof option);
219
220         if(udp_rcvbuf && setsockopt(nfd, SOL_SOCKET, SO_RCVBUF, (void *)&udp_rcvbuf, sizeof(udp_rcvbuf)))
221                 logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_RCVBUF to %i: %s", udp_rcvbuf, strerror(errno));
222
223         if(udp_sndbuf && setsockopt(nfd, SOL_SOCKET, SO_SNDBUF, (void *)&udp_sndbuf, sizeof(udp_sndbuf)))
224                 logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_SNDBUF to %i: %s", udp_sndbuf, strerror(errno));
225
226 #if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
227         if(sa->sa.sa_family == AF_INET6)
228                 setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
229 #endif
230
231 #if defined(IP_DONTFRAG) && !defined(IP_DONTFRAGMENT)
232 #define IP_DONTFRAGMENT IP_DONTFRAG
233 #endif
234
235 #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
236         if(myself->options & OPTION_PMTU_DISCOVERY) {
237                 option = IP_PMTUDISC_DO;
238                 setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, (void *)&option, sizeof(option));
239         }
240 #elif defined(IPPROTO_IP) && defined(IP_DONTFRAGMENT)
241         if(myself->options & OPTION_PMTU_DISCOVERY) {
242                 option = 1;
243                 setsockopt(nfd, IPPROTO_IP, IP_DONTFRAGMENT, (void *)&option, sizeof(option));
244         }
245 #else
246 #warning No way to disable IPv4 fragmentation
247 #endif
248
249 #if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
250         if(myself->options & OPTION_PMTU_DISCOVERY) {
251                 option = IPV6_PMTUDISC_DO;
252                 setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, (void *)&option, sizeof(option));
253         }
254 #elif defined(IPPROTO_IPV6) && defined(IPV6_DONTFRAG)
255         if(myself->options & OPTION_PMTU_DISCOVERY) {
256                 option = 1;
257                 setsockopt(nfd, IPPROTO_IPV6, IPV6_DONTFRAG, (void *)&option, sizeof(option));
258         }
259 #else
260 #warning No way to disable IPv6 fragmentation
261 #endif
262
263         if (!bind_to_interface(nfd)) {
264                 closesocket(nfd);
265                 return -1;
266         }
267
268         if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
269                 closesocket(nfd);
270                 addrstr = sockaddr2hostname(sa);
271                 logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to %s/udp: %s", addrstr, sockstrerror(sockerrno));
272                 free(addrstr);
273                 return -1;
274         }
275
276         return nfd;
277 } /* int setup_vpn_in_socket */
278
279 static void retry_outgoing_handler(void *data) {
280         setup_outgoing_connection(data);
281 }
282
283 void retry_outgoing(outgoing_t *outgoing) {
284         outgoing->timeout += 5;
285
286         if(outgoing->timeout > maxtimeout)
287                 outgoing->timeout = maxtimeout;
288
289         timeout_add(&outgoing->ev, retry_outgoing_handler, outgoing, &(struct timeval){outgoing->timeout, rand() % 100000});
290
291         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Trying to re-establish outgoing connection in %d seconds", outgoing->timeout);
292 }
293
294 void finish_connecting(connection_t *c) {
295         logger(DEBUG_CONNECTIONS, LOG_INFO, "Connected to %s (%s)", c->name, c->hostname);
296
297         c->last_ping_time = now.tv_sec;
298         c->status.connecting = false;
299
300         send_id(c);
301 }
302
303 static void do_outgoing_pipe(connection_t *c, char *command) {
304 #ifndef HAVE_MINGW
305         int fd[2];
306
307         if(socketpair(AF_UNIX, SOCK_STREAM, 0, fd)) {
308                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not create socketpair: %s", strerror(errno));
309                 return;
310         }
311
312         if(fork()) {
313                 c->socket = fd[0];
314                 close(fd[1]);
315                 logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Using proxy %s", command);
316                 return;
317         }
318
319         close(0);
320         close(1);
321         close(fd[0]);
322         dup2(fd[1], 0);
323         dup2(fd[1], 1);
324         close(fd[1]);
325
326         // Other filedescriptors should be closed automatically by CLOEXEC
327
328         char *host = NULL;
329         char *port = NULL;
330
331         sockaddr2str(&c->address, &host, &port);
332         setenv("REMOTEADDRESS", host, true);
333         setenv("REMOTEPORT", port, true);
334         setenv("NODE", c->name, true);
335         setenv("NAME", myself->name, true);
336         if(netname)
337                 setenv("NETNAME", netname, true);
338
339         int result = system(command);
340         if(result < 0)
341                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not execute %s: %s", command, strerror(errno));
342         else if(result)
343                 logger(DEBUG_ALWAYS, LOG_ERR, "%s exited with non-zero status %d", command, result);
344         exit(result);
345 #else
346         logger(DEBUG_ALWAYS, LOG_ERR, "Proxy type exec not supported on this platform!");
347         return;
348 #endif
349 }
350
351 static void handle_meta_write(connection_t *c) {
352         if(c->outbuf.len <= c->outbuf.offset)
353                 return;
354
355         ssize_t outlen = send(c->socket, c->outbuf.data + c->outbuf.offset, c->outbuf.len - c->outbuf.offset, 0);
356         if(outlen <= 0) {
357                 if(!errno || errno == EPIPE) {
358                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection closed by %s (%s)", c->name, c->hostname);
359                 } else if(sockwouldblock(sockerrno)) {
360                         logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Sending %d bytes to %s (%s) would block", c->outbuf.len - c->outbuf.offset, c->name, c->hostname);
361                         return;
362                 } else {
363                         logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not send %d bytes of data to %s (%s): %s", c->outbuf.len - c->outbuf.offset, c->name, c->hostname, strerror(errno));
364                 }
365
366                 terminate_connection(c, c->status.active);
367                 return;
368         }
369
370         buffer_read(&c->outbuf, outlen);
371         if(!c->outbuf.len)
372                 io_set(&c->io, IO_READ);
373 }
374
375 static void handle_meta_io(void *data, int flags) {
376         connection_t *c = data;
377
378         if(c->status.connecting) {
379                 c->status.connecting = false;
380
381                 int result;
382                 socklen_t len = sizeof result;
383                 getsockopt(c->socket, SOL_SOCKET, SO_ERROR, (void *)&result, &len);
384
385                 if(!result)
386                         finish_connecting(c);
387                 else {
388                         logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Error while connecting to %s (%s): %s", c->name, c->hostname, sockstrerror(result));
389                         terminate_connection(c, false);
390                         return;
391                 }
392         }
393
394         if(flags & IO_WRITE)
395                 handle_meta_write(c);
396         else
397                 handle_meta_connection_data(c);
398 }
399
400 bool do_outgoing_connection(outgoing_t *outgoing) {
401         char *address, *port, *space;
402         struct addrinfo *proxyai = NULL;
403         int result;
404
405 begin:
406         if(!outgoing->ai) {
407                 if(!outgoing->cfg) {
408                         logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not set up a meta connection to %s", outgoing->name);
409                         retry_outgoing(outgoing);
410                         return false;
411                 }
412
413                 get_config_string(outgoing->cfg, &address);
414
415                 space = strchr(address, ' ');
416                 if(space) {
417                         port = xstrdup(space + 1);
418                         *space = 0;
419                 } else {
420                         if(!get_config_string(lookup_config(outgoing->config_tree, "Port"), &port))
421                                 port = xstrdup("655");
422                 }
423
424                 outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
425                 free(address);
426                 free(port);
427
428                 outgoing->aip = outgoing->ai;
429                 outgoing->cfg = lookup_config_next(outgoing->config_tree, outgoing->cfg);
430         }
431
432         if(!outgoing->aip) {
433                 if(outgoing->ai)
434                         freeaddrinfo(outgoing->ai);
435                 outgoing->ai = NULL;
436                 goto begin;
437         }
438
439         connection_t *c = new_connection();
440         c->outgoing = outgoing;
441
442         memcpy(&c->address, outgoing->aip->ai_addr, outgoing->aip->ai_addrlen);
443         outgoing->aip = outgoing->aip->ai_next;
444
445         c->hostname = sockaddr2hostname(&c->address);
446
447         logger(DEBUG_CONNECTIONS, LOG_INFO, "Trying to connect to %s (%s)", outgoing->name, c->hostname);
448
449         if(!proxytype) {
450                 c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
451                 configure_tcp(c);
452         } else if(proxytype == PROXY_EXEC) {
453                 do_outgoing_pipe(c, proxyhost);
454         } else {
455                 proxyai = str2addrinfo(proxyhost, proxyport, SOCK_STREAM);
456                 if(!proxyai) {
457                         free_connection(c);
458                         goto begin;
459                 }
460                 logger(DEBUG_CONNECTIONS, LOG_INFO, "Using proxy at %s port %s", proxyhost, proxyport);
461                 c->socket = socket(proxyai->ai_family, SOCK_STREAM, IPPROTO_TCP);
462                 configure_tcp(c);
463         }
464
465         if(c->socket == -1) {
466                 logger(DEBUG_CONNECTIONS, LOG_ERR, "Creating socket for %s failed: %s", c->hostname, sockstrerror(sockerrno));
467                 free_connection(c);
468                 goto begin;
469         }
470
471 #ifdef FD_CLOEXEC
472         fcntl(c->socket, F_SETFD, FD_CLOEXEC);
473 #endif
474
475         if(proxytype != PROXY_EXEC) {
476 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
477                 int option = 1;
478                 if(c->address.sa.sa_family == AF_INET6)
479                         setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
480 #endif
481
482                 bind_to_interface(c->socket);
483         }
484
485         /* Connect */
486
487         if(!proxytype) {
488                 result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
489         } else if(proxytype == PROXY_EXEC) {
490                 result = 0;
491         } else {
492                 result = connect(c->socket, proxyai->ai_addr, proxyai->ai_addrlen);
493                 freeaddrinfo(proxyai);
494         }
495
496         if(result == -1 && !sockinprogress(sockerrno)) {
497                 logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not connect to %s (%s): %s", outgoing->name, c->hostname, sockstrerror(sockerrno));
498                 free_connection(c);
499
500                 goto begin;
501         }
502
503         /* Now that there is a working socket, fill in the rest and register this connection. */
504
505         c->status.connecting = true;
506         c->name = xstrdup(outgoing->name);
507         c->outcipher = myself->connection->outcipher;
508         c->outdigest = myself->connection->outdigest;
509         c->outmaclength = myself->connection->outmaclength;
510         c->outcompression = myself->connection->outcompression;
511         c->last_ping_time = now.tv_sec;
512
513         connection_add(c);
514
515         io_add(&c->io, handle_meta_io, c, c->socket, IO_READ|IO_WRITE);
516
517         return true;
518 }
519
520 void setup_outgoing_connection(outgoing_t *outgoing) {
521         timeout_del(&outgoing->ev);
522
523         node_t *n = lookup_node(outgoing->name);
524
525         if(n && n->connection) {
526                 logger(DEBUG_CONNECTIONS, LOG_INFO, "Already connected to %s", outgoing->name);
527
528                 n->connection->outgoing = outgoing;
529                 return;
530         }
531
532         init_configuration(&outgoing->config_tree);
533         read_host_config(outgoing->config_tree, outgoing->name);
534         outgoing->cfg = lookup_config(outgoing->config_tree, "Address");
535
536         if(!outgoing->cfg) {
537                 logger(DEBUG_ALWAYS, LOG_ERR, "No address specified for %s", outgoing->name);
538                 return;
539         }
540
541         do_outgoing_connection(outgoing);
542 }
543
544 /*
545   accept a new tcp connect and create a
546   new connection
547 */
548 void handle_new_meta_connection(void *data, int flags) {
549         listen_socket_t *l = data;
550         connection_t *c;
551         sockaddr_t sa;
552         int fd;
553         socklen_t len = sizeof sa;
554
555         fd = accept(l->tcp.fd, &sa.sa, &len);
556
557         if(fd < 0) {
558                 logger(DEBUG_ALWAYS, LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
559                 return;
560         }
561
562         sockaddrunmap(&sa);
563
564         c = new_connection();
565         c->name = xstrdup("<unknown>");
566         c->outcipher = myself->connection->outcipher;
567         c->outdigest = myself->connection->outdigest;
568         c->outmaclength = myself->connection->outmaclength;
569         c->outcompression = myself->connection->outcompression;
570
571         c->address = sa;
572         c->hostname = sockaddr2hostname(&sa);
573         c->socket = fd;
574         c->last_ping_time = now.tv_sec;
575
576         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection from %s", c->hostname);
577
578         io_add(&c->io, handle_meta_io, c, c->socket, IO_READ);
579
580         configure_tcp(c);
581
582         connection_add(c);
583
584         c->allow_request = ID;
585         send_id(c);
586 }
587
588 #ifndef HAVE_MINGW
589 /*
590   accept a new UNIX socket connection
591 */
592 void handle_new_unix_connection(void *data, int flags) {
593         io_t *io = data;
594         connection_t *c;
595         sockaddr_t sa;
596         int fd;
597         socklen_t len = sizeof sa;
598
599         fd = accept(io->fd, &sa.sa, &len);
600
601         if(fd < 0) {
602                 logger(DEBUG_ALWAYS, LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
603                 return;
604         }
605
606         sockaddrunmap(&sa);
607
608         c = new_connection();
609         c->name = xstrdup("<control>");
610         c->address = sa;
611         c->hostname = xstrdup("localhost port unix");
612         c->socket = fd;
613         c->last_ping_time = now.tv_sec;
614
615         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection from %s", c->hostname);
616
617         io_add(&c->io, handle_meta_io, c, c->socket, IO_READ);
618
619         connection_add(c);
620
621         c->allow_request = ID;
622
623         send_id(c);
624 }
625 #endif
626
627 static void free_outgoing(outgoing_t *outgoing) {
628         timeout_del(&outgoing->ev);
629
630         if(outgoing->ai)
631                 freeaddrinfo(outgoing->ai);
632
633         if(outgoing->config_tree)
634                 exit_configuration(&outgoing->config_tree);
635
636         if(outgoing->name)
637                 free(outgoing->name);
638
639         free(outgoing);
640 }
641
642 void try_outgoing_connections(void) {
643         /* If there is no outgoing list yet, create one. Otherwise, mark all outgoings as deleted. */
644
645         if(!outgoing_list) {
646                 outgoing_list = list_alloc((list_action_t)free_outgoing);
647         } else {
648                 for list_each(outgoing_t, outgoing, outgoing_list)
649                         outgoing->timeout = -1;
650         }
651
652         /* Make sure there is one outgoing_t in the list for each ConnectTo. */
653
654         for(config_t *cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
655                 char *name;
656                 get_config_string(cfg, &name);
657
658                 if(!check_id(name)) {
659                         logger(DEBUG_ALWAYS, LOG_ERR,
660                                    "Invalid name for outgoing connection in %s line %d",
661                                    cfg->file, cfg->line);
662                         free(name);
663                         continue;
664                 }
665
666                 bool found = false;
667
668                 for list_each(outgoing_t, outgoing, outgoing_list) {
669                         if(!strcmp(outgoing->name, name)) {
670                                 found = true;
671                                 outgoing->timeout = 0;
672                                 break;
673                         }
674                 }
675
676                 if(!found) {
677                         outgoing_t *outgoing = xzalloc(sizeof *outgoing);
678                         outgoing->name = name;
679                         list_insert_tail(outgoing_list, outgoing);
680                         setup_outgoing_connection(outgoing);
681                 }
682         }
683
684         /* Terminate any connections whose outgoing_t is to be deleted. */
685
686         for list_each(connection_t, c, connection_list) {
687                 if(c->outgoing && c->outgoing->timeout == -1) {
688                         c->outgoing = NULL;
689                         logger(DEBUG_CONNECTIONS, LOG_INFO, "No more outgoing connection to %s", c->name);
690                         terminate_connection(c, c->status.active);
691                 }
692         }
693
694         /* Delete outgoing_ts for which there is no ConnectTo. */
695
696         for list_each(outgoing_t, outgoing, outgoing_list)
697                 if(outgoing->timeout == -1)
698                         list_delete_node(outgoing_list, node);
699 }