1 /*
2 net_socket.c -- Handle various kinds of sockets.
3 Copyright (C) 1998-2005 Ivo Timmermans,
4 2000-2017 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 "avl_tree.h"
26 #include "conf.h"
27 #include "connection.h"
28 #include "event.h"
29 #include "logger.h"
30 #include "meta.h"
31 #include "net.h"
32 #include "netutl.h"
33 #include "protocol.h"
34 #include "proxy.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 mintimeout = 0;
45 int maxtimeout = 900;
46 int seconds_till_retry = 5;
47 int udp_rcvbuf = 0;
48 int udp_sndbuf = 0;
49
50 listen_socket_t listen_socket[MAXSOCKETS];
51 int listen_sockets;
52 list_t *outgoing_list = NULL;
53
54 /* Setup sockets */
55
configure_tcp(connection_t * c)56 static void configure_tcp(connection_t *c) {
57 int option;
58
59 #ifdef O_NONBLOCK
60 int flags = fcntl(c->socket, F_GETFL);
61
62 if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) {
63 logger(LOG_ERR, "fcntl for %s: %s", c->hostname, strerror(errno));
64 }
65
66 #elif defined(WIN32)
67 unsigned long arg = 1;
68
69 if(ioctlsocket(c->socket, FIONBIO, &arg) != 0) {
70 logger(LOG_ERR, "ioctlsocket for %s: %s", c->hostname, sockstrerror(sockerrno));
71 }
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(IP_TOS) && defined(IPTOS_LOWDELAY)
81 option = IPTOS_LOWDELAY;
82 setsockopt(c->socket, IPPROTO_IP, IP_TOS, (void *)&option, sizeof(option));
83 #endif
84
85 #if defined(IPV6_TCLASS) && defined(IPTOS_LOWDELAY)
86 option = IPTOS_LOWDELAY;
87 setsockopt(c->socket, IPPROTO_IPV6, IPV6_TCLASS, (void *)&option, sizeof(option));
88 #endif
89 }
90
bind_to_interface(int sd)91 static bool bind_to_interface(int sd) {
92 char *iface;
93
94 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
95 struct ifreq ifr;
96 int status;
97 #endif /* defined(SOL_SOCKET) && defined(SO_BINDTODEVICE) */
98
99 if(!get_config_string(lookup_config(config_tree, "BindToInterface"), &iface)) {
100 return true;
101 }
102
103 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
104 memset(&ifr, 0, sizeof(ifr));
105 strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
106 ifr.ifr_ifrn.ifrn_name[IFNAMSIZ - 1] = 0;
107 free(iface);
108
109 status = setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr));
110
111 if(status) {
112 logger(LOG_ERR, "Can't bind to interface %s: %s", ifr.ifr_ifrn.ifrn_name, strerror(errno));
113 return false;
114 }
115
116 #else /* if !defined(SOL_SOCKET) || !defined(SO_BINDTODEVICE) */
117 logger(LOG_WARNING, "%s not supported on this platform", "BindToInterface");
118 #endif
119
120 return true;
121 }
122
setup_listen_socket(const sockaddr_t * sa)123 int setup_listen_socket(const sockaddr_t *sa) {
124 int nfd;
125 char *addrstr;
126 int option;
127 char *iface;
128
129 nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
130
131 if(nfd < 0) {
132 ifdebug(STATUS) logger(LOG_ERR, "Creating metasocket failed: %s", sockstrerror(sockerrno));
133 return -1;
134 }
135
136 #ifdef FD_CLOEXEC
137 fcntl(nfd, F_SETFD, FD_CLOEXEC);
138 #endif
139
140 /* Optimize TCP settings */
141
142 option = 1;
143 setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof(option));
144
145 #if defined(IPV6_V6ONLY)
146
147 if(sa->sa.sa_family == AF_INET6) {
148 setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof(option));
149 }
150
151 #else
152 #warning IPV6_V6ONLY not defined
153 #endif
154
155 if(get_config_string(lookup_config(config_tree, "BindToInterface"), &iface)) {
156 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
157 struct ifreq ifr;
158
159 memset(&ifr, 0, sizeof(ifr));
160 strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
161 ifr.ifr_ifrn.ifrn_name[IFNAMSIZ - 1] = 0;
162 free(iface);
163
164 if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr))) {
165 closesocket(nfd);
166 logger(LOG_ERR, "Can't bind to interface %s: %s", ifr.ifr_ifrn.ifrn_name, strerror(sockerrno));
167 return -1;
168 }
169
170 #else
171 logger(LOG_WARNING, "%s not supported on this platform", "BindToInterface");
172 #endif
173 }
174
175 if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
176 closesocket(nfd);
177 addrstr = sockaddr2hostname(sa);
178 logger(LOG_ERR, "Can't bind to %s/tcp: %s", addrstr, sockstrerror(sockerrno));
179 free(addrstr);
180 return -1;
181 }
182
183 if(listen(nfd, 3)) {
184 closesocket(nfd);
185 logger(LOG_ERR, "System call `%s' failed: %s", "listen", sockstrerror(sockerrno));
186 return -1;
187 }
188
189 return nfd;
190 }
191
setup_vpn_in_socket(const sockaddr_t * sa)192 int setup_vpn_in_socket(const sockaddr_t *sa) {
193 int nfd;
194 char *addrstr;
195 int option;
196
197 nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
198
199 if(nfd < 0) {
200 logger(LOG_ERR, "Creating UDP socket failed: %s", sockstrerror(sockerrno));
201 return -1;
202 }
203
204 #ifdef FD_CLOEXEC
205 fcntl(nfd, F_SETFD, FD_CLOEXEC);
206 #endif
207
208 #ifdef O_NONBLOCK
209 {
210 int flags = fcntl(nfd, F_GETFL);
211
212 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
213 closesocket(nfd);
214 logger(LOG_ERR, "System call `%s' failed: %s", "fcntl",
215 strerror(errno));
216 return -1;
217 }
218 }
219 #elif defined(WIN32)
220 {
221 unsigned long arg = 1;
222
223 if(ioctlsocket(nfd, FIONBIO, &arg) != 0) {
224 closesocket(nfd);
225 logger(LOG_ERR, "Call to `%s' failed: %s", "ioctlsocket", sockstrerror(sockerrno));
226 return -1;
227 }
228 }
229 #endif
230
231 option = 1;
232 setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof(option));
233 setsockopt(nfd, SOL_SOCKET, SO_BROADCAST, (void *)&option, sizeof(option));
234
235 if(udp_rcvbuf && setsockopt(nfd, SOL_SOCKET, SO_RCVBUF, (void *)&udp_rcvbuf, sizeof(udp_rcvbuf))) {
236 logger(LOG_WARNING, "Can't set UDP SO_RCVBUF to %i: %s", udp_rcvbuf, strerror(errno));
237 }
238
239 if(udp_sndbuf && setsockopt(nfd, SOL_SOCKET, SO_SNDBUF, (void *)&udp_sndbuf, sizeof(udp_sndbuf))) {
240 logger(LOG_WARNING, "Can't set UDP SO_SNDBUF to %i: %s", udp_sndbuf, strerror(errno));
241 }
242
243 #if defined(IPV6_V6ONLY)
244
245 if(sa->sa.sa_family == AF_INET6) {
246 setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof(option));
247 }
248
249 #endif
250
251 #if defined(IP_DONTFRAG) && !defined(IP_DONTFRAGMENT)
252 #define IP_DONTFRAGMENT IP_DONTFRAG
253 #endif
254
255 #if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
256
257 if(myself->options & OPTION_PMTU_DISCOVERY) {
258 option = IP_PMTUDISC_DO;
259 setsockopt(nfd, IPPROTO_IP, IP_MTU_DISCOVER, (void *)&option, sizeof(option));
260 }
261
262 #elif defined(IP_DONTFRAGMENT)
263
264 if(myself->options & OPTION_PMTU_DISCOVERY) {
265 option = 1;
266 setsockopt(nfd, IPPROTO_IP, IP_DONTFRAGMENT, (void *)&option, sizeof(option));
267 }
268
269 #endif
270
271 #if defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
272
273 if(myself->options & OPTION_PMTU_DISCOVERY) {
274 option = IPV6_PMTUDISC_DO;
275 setsockopt(nfd, IPPROTO_IPV6, IPV6_MTU_DISCOVER, (void *)&option, sizeof(option));
276 }
277
278 #elif defined(IPV6_DONTFRAG)
279
280 if(myself->options & OPTION_PMTU_DISCOVERY) {
281 option = 1;
282 setsockopt(nfd, IPPROTO_IPV6, IPV6_DONTFRAG, (void *)&option, sizeof(option));
283 }
284
285 #endif
286
287 if(!bind_to_interface(nfd)) {
288 closesocket(nfd);
289 return -1;
290 }
291
292 if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
293 closesocket(nfd);
294 addrstr = sockaddr2hostname(sa);
295 logger(LOG_ERR, "Can't bind to %s/udp: %s", addrstr, sockstrerror(sockerrno));
296 free(addrstr);
297 return -1;
298 }
299
300 return nfd;
301 } /* int setup_vpn_in_socket */
302
retry_outgoing(outgoing_t * outgoing)303 void retry_outgoing(outgoing_t *outgoing) {
304 outgoing->timeout += 5;
305
306 if(outgoing->timeout < mintimeout) {
307 outgoing->timeout = mintimeout;
308 }
309
310 if(outgoing->timeout > maxtimeout) {
311 outgoing->timeout = maxtimeout;
312 }
313
314 if(outgoing->event) {
315 event_del(outgoing->event);
316 }
317
318 outgoing->event = new_event();
319 outgoing->event->handler = (event_handler_t) setup_outgoing_connection;
320 outgoing->event->time = now + outgoing->timeout;
321 outgoing->event->data = outgoing;
322 event_add(outgoing->event);
323
324 ifdebug(CONNECTIONS) logger(LOG_NOTICE,
325 "Trying to re-establish outgoing connection in %d seconds",
326 outgoing->timeout);
327 }
328
finish_connecting(connection_t * c)329 void finish_connecting(connection_t *c) {
330 ifdebug(CONNECTIONS) logger(LOG_INFO, "Connected to %s (%s)", c->name, c->hostname);
331
332 c->last_ping_time = now;
333
334 send_id(c);
335 }
336
do_outgoing_pipe(connection_t * c,char * command)337 static void do_outgoing_pipe(connection_t *c, char *command) {
338 #ifndef HAVE_MINGW
339 int fd[2];
340
341 if(socketpair(AF_UNIX, SOCK_STREAM, 0, fd)) {
342 logger(LOG_ERR, "Could not create socketpair: %s\n", strerror(errno));
343 return;
344 }
345
346 if(fork()) {
347 c->socket = fd[0];
348 close(fd[1]);
349 ifdebug(CONNECTIONS) logger(LOG_DEBUG, "Using proxy %s", command);
350 return;
351 }
352
353 close(0);
354 close(1);
355 close(fd[0]);
356 dup2(fd[1], 0);
357 dup2(fd[1], 1);
358 close(fd[1]);
359
360 // Other filedescriptors should be closed automatically by CLOEXEC
361
362 char *host = NULL;
363 char *port = NULL;
364
365 sockaddr2str(&c->address, &host, &port);
366 setenv("REMOTEADDRESS", host, true);
367 setenv("REMOTEPORT", port, true);
368 setenv("NODE", c->name, true);
369 setenv("NAME", myself->name, true);
370
371 if(netname) {
372 setenv("NETNAME", netname, true);
373 }
374
375 int result = system(command);
376
377 if(result < 0) {
378 logger(LOG_ERR, "Could not execute %s: %s\n", command, strerror(errno));
379 } else if(result) {
380 logger(LOG_ERR, "%s exited with non-zero status %d", command, result);
381 }
382
383 exit(result);
384 #else
385 logger(LOG_ERR, "Proxy type exec not supported on this platform!");
386 return;
387 #endif
388 }
389
is_valid_host_port(const char * host,const char * port)390 static bool is_valid_host_port(const char *host, const char *port) {
391 for(const char *p = host; *p; p++)
392 if(!isalnum(*p) && *p != '-' && *p != '.') {
393 return false;
394 }
395
396 for(const char *p = port; *p; p++)
397 if(!isalnum(*p)) {
398 return false;
399 }
400
401 return true;
402 }
403
do_outgoing_connection(connection_t * c)404 void do_outgoing_connection(connection_t *c) {
405 struct addrinfo *proxyai = NULL;
406 int result;
407
408 if(!c->outgoing) {
409 logger(LOG_ERR, "do_outgoing_connection() for %s called without c->outgoing", c->name);
410 abort();
411 }
412
413 begin:
414
415 if(!c->outgoing->ai) {
416 if(!c->outgoing->cfg) {
417 ifdebug(CONNECTIONS) logger(LOG_ERR, "Could not set up a meta connection to %s",
418 c->name);
419 c->status.remove = true;
420 retry_outgoing(c->outgoing);
421 c->outgoing = NULL;
422 return;
423 }
424
425 char *address, *port, *space;
426
427 get_config_string(c->outgoing->cfg, &address);
428
429 space = strchr(address, ' ');
430
431 if(space) {
432 port = xstrdup(space + 1);
433 *space = 0;
434 } else {
435 if(!get_config_string(lookup_config(c->config_tree, "Port"), &port)) {
436 port = xstrdup("655");
437 }
438 }
439
440 c->outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
441
442 // If we cannot resolve the address, maybe we are using a proxy that can?
443 if(!c->outgoing->ai && proxytype != PROXY_NONE && is_valid_host_port(address, port)) {
444 memset(&c->address, 0, sizeof(c->address));
445 c->address.sa.sa_family = AF_UNKNOWN;
446 c->address.unknown.address = address;
447 c->address.unknown.port = port;
448 } else {
449 free(address);
450 free(port);
451 }
452
453 c->outgoing->aip = c->outgoing->ai;
454 c->outgoing->cfg = lookup_config_next(c->config_tree, c->outgoing->cfg);
455
456 if(!c->outgoing->ai && proxytype != PROXY_NONE) {
457 goto connect;
458 }
459 }
460
461 if(!c->outgoing->aip) {
462 if(c->outgoing->ai) {
463 freeaddrinfo(c->outgoing->ai);
464 }
465
466 c->outgoing->ai = NULL;
467 goto begin;
468 }
469
470 memcpy(&c->address, c->outgoing->aip->ai_addr, c->outgoing->aip->ai_addrlen);
471 c->outgoing->aip = c->outgoing->aip->ai_next;
472
473 connect:
474
475 if(c->hostname) {
476 free(c->hostname);
477 }
478
479 c->hostname = sockaddr2hostname(&c->address);
480
481 ifdebug(CONNECTIONS) logger(LOG_INFO, "Trying to connect to %s (%s)", c->name,
482 c->hostname);
483
484 if(!proxytype) {
485 c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
486 } else if(proxytype == PROXY_EXEC) {
487 c->status.proxy_passed = true;
488 do_outgoing_pipe(c, proxyhost);
489 } else {
490 proxyai = str2addrinfo(proxyhost, proxyport, SOCK_STREAM);
491
492 if(!proxyai) {
493 goto begin;
494 }
495
496 ifdebug(CONNECTIONS) logger(LOG_INFO, "Using proxy at %s port %s", proxyhost, proxyport);
497 c->socket = socket(proxyai->ai_family, SOCK_STREAM, IPPROTO_TCP);
498 }
499
500 if(c->socket == -1) {
501 ifdebug(CONNECTIONS) logger(LOG_ERR, "Creating socket for %s failed: %s", c->hostname, sockstrerror(sockerrno));
502 goto begin;
503 }
504
505 if(proxytype != PROXY_EXEC) {
506 configure_tcp(c);
507 }
508
509 #ifdef FD_CLOEXEC
510 fcntl(c->socket, F_SETFD, FD_CLOEXEC);
511 #endif
512
513 if(proxytype != PROXY_EXEC) {
514 #if defined(IPV6_V6ONLY)
515 int option = 1;
516
517 if(c->address.sa.sa_family == AF_INET6) {
518 setsockopt(c->socket, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof(option));
519 }
520
521 #endif
522
523 bind_to_interface(c->socket);
524
525 int b = -1;
526
527 for(int i = 0; i < listen_sockets; i++) {
528 if(listen_socket[i].sa.sa.sa_family == c->address.sa.sa_family) {
529 if(b == -1) {
530 b = i;
531 } else {
532 b = -1;
533 break;
534 }
535 }
536 }
537
538 if(b != -1) {
539 sockaddr_t sa = listen_socket[b].sa;
540
541 if(sa.sa.sa_family == AF_INET) {
542 sa.in.sin_port = 0;
543 } else if(sa.sa.sa_family == AF_INET6) {
544 sa.in6.sin6_port = 0;
545 }
546
547 if(bind(c->socket, &sa.sa, SALEN(sa.sa))) {
548 char *addrstr = sockaddr2hostname(&sa);
549 logger(LOG_ERR, "Can't bind to %s/tcp: %s", addrstr, sockstrerror(sockerrno));
550 free(addrstr);
551 }
552 }
553 }
554
555 /* Connect */
556
557 if(!proxytype) {
558 result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
559 } else if(proxytype == PROXY_EXEC) {
560 result = 0;
561 } else {
562 result = connect(c->socket, proxyai->ai_addr, proxyai->ai_addrlen);
563 freeaddrinfo(proxyai);
564 }
565
566 now = time(NULL);
567
568 if(result == -1) {
569 if(sockinprogress(sockerrno)) {
570 c->last_ping_time = now;
571 c->status.connecting = true;
572 return;
573 }
574
575 closesocket(c->socket);
576
577 ifdebug(CONNECTIONS) logger(LOG_ERR, "%s: %s", c->hostname, sockstrerror(sockerrno));
578
579 goto begin;
580 }
581
582 finish_connecting(c);
583
584 return;
585 }
586
setup_outgoing_connection(outgoing_t * outgoing)587 void setup_outgoing_connection(outgoing_t *outgoing) {
588 connection_t *c;
589 node_t *n;
590
591 outgoing->event = NULL;
592
593 n = lookup_node(outgoing->name);
594
595 if(n)
596 if(n->connection) {
597 ifdebug(CONNECTIONS) logger(LOG_INFO, "Already connected to %s", outgoing->name);
598
599 n->connection->outgoing = outgoing;
600 return;
601 }
602
603 c = new_connection();
604 c->name = xstrdup(outgoing->name);
605 c->outcipher = myself->connection->outcipher;
606 c->outdigest = myself->connection->outdigest;
607 c->outmaclength = myself->connection->outmaclength;
608 c->outcompression = myself->connection->outcompression;
609
610 init_configuration(&c->config_tree);
611
612 if(!read_connection_config(c)) {
613 free_connection(c);
614 outgoing->timeout = maxtimeout;
615 retry_outgoing(outgoing);
616 return;
617 }
618
619 outgoing->cfg = lookup_config(c->config_tree, "Address");
620
621 if(!outgoing->cfg) {
622 logger(LOG_ERR, "No address specified for %s", c->name);
623 free_connection(c);
624 outgoing->timeout = maxtimeout;
625 retry_outgoing(outgoing);
626 return;
627 }
628
629 c->outgoing = outgoing;
630 c->last_ping_time = now;
631
632 connection_add(c);
633
634 do_outgoing_connection(c);
635 }
636
637 /*
638 accept a new tcp connect and create a
639 new connection
640 */
handle_new_meta_connection(int sock)641 bool handle_new_meta_connection(int sock) {
642 static const int max_accept_burst = 10;
643 static int last_accept_burst;
644 static int last_accept_time;
645 connection_t *c;
646 sockaddr_t sa;
647 int fd;
648 socklen_t len = sizeof(sa);
649
650 fd = accept(sock, &sa.sa, &len);
651
652 if(fd < 0) {
653 logger(LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
654 return false;
655 }
656
657 if(last_accept_time == now) {
658 last_accept_burst++;
659
660 if(last_accept_burst >= max_accept_burst) {
661 if(last_accept_burst == max_accept_burst) {
662 ifdebug(CONNECTIONS) logger(LOG_WARNING, "Throttling incoming connections");
663 }
664
665 tarpit(fd);
666 return false;
667 }
668 } else {
669 last_accept_burst = 0;
670 last_accept_time = now;
671 }
672
673 sockaddrunmap(&sa);
674
675 c = new_connection();
676 c->name = xstrdup("<unknown>");
677 c->outcipher = myself->connection->outcipher;
678 c->outdigest = myself->connection->outdigest;
679 c->outmaclength = myself->connection->outmaclength;
680 c->outcompression = myself->connection->outcompression;
681
682 c->address = sa;
683 c->hostname = sockaddr2hostname(&sa);
684 c->socket = fd;
685 c->last_ping_time = now;
686
687 ifdebug(CONNECTIONS) logger(LOG_NOTICE, "Connection from %s", c->hostname);
688
689 configure_tcp(c);
690
691 connection_add(c);
692
693 c->allow_request = ID;
694
695 return true;
696 }
697
free_outgoing(outgoing_t * outgoing)698 static void free_outgoing(outgoing_t *outgoing) {
699 if(outgoing->ai) {
700 freeaddrinfo(outgoing->ai);
701 }
702
703 if(outgoing->name) {
704 free(outgoing->name);
705 }
706
707 free(outgoing);
708 }
709
try_outgoing_connections(void)710 void try_outgoing_connections(void) {
711 static config_t *cfg = NULL;
712 char *name;
713 outgoing_t *outgoing;
714
715 outgoing_list = list_alloc((list_action_t)free_outgoing);
716
717 for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
718 get_config_string(cfg, &name);
719
720 if(!check_id(name)) {
721 logger(LOG_ERR,
722 "Invalid name for outgoing connection in %s line %d",
723 cfg->file, cfg->line);
724 free(name);
725 continue;
726 }
727
728 outgoing = xmalloc_and_zero(sizeof(*outgoing));
729 outgoing->name = name;
730 list_insert_tail(outgoing_list, outgoing);
731 setup_outgoing_connection(outgoing);
732 }
733 }
734