tinc-vpn.org Git - tinc/blob - src/net_socket.c

   1 /*
   2     net_socket.c -- Handle various kinds of sockets.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2015 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
  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 #elif defined(WIN32)
  66         unsigned long arg = 1;
  67
  68         if(ioctlsocket(c->socket, FIONBIO, &arg) != 0) {
  69                 logger(LOG_ERR, "ioctlsocket for %s: %s", c->hostname, sockstrerror(sockerrno));
  70         }
  71 #endif
  72
  73 #if defined(SOL_TCP) && defined(TCP_NODELAY)
  74         option = 1;
  75         setsockopt(c->socket, SOL_TCP, TCP_NODELAY, (void *)&option, sizeof(option));
  76 #endif
  77
  78 #if defined(SOL_IP) && defined(IP_TOS) && defined(IPTOS_LOWDELAY)
  79         option = IPTOS_LOWDELAY;
  80         setsockopt(c->socket, SOL_IP, IP_TOS, (void *)&option, sizeof(option));
  81 #endif
  82
  83 #if defined(IPPROTO_IPV6) && defined(IPV6_TCLASS) && defined(IPTOS_LOWDELAY)
  84         option = IPTOS_LOWDELAY;
  85         setsockopt(c->socket, IPPROTO_IPV6, IPV6_TCLASS, (void *)&option, sizeof(option));
  86 #endif
  87 }
  88
  89 static bool bind_to_interface(int sd) {
  90         char *iface;
  91
  92 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
  93         struct ifreq ifr;
  94         int status;
  95 #endif /* defined(SOL_SOCKET) && defined(SO_BINDTODEVICE) */
  96
  97         if(!get_config_string(lookup_config (config_tree, "BindToInterface"), &iface))
  98                 return true;
  99
 100 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
 101         memset(&ifr, 0, sizeof(ifr));
 102         strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
 103         ifr.ifr_ifrn.ifrn_name[IFNAMSIZ - 1] = 0;
 104         free(iface);
 105
 106         status = setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr));
 107         if(status) {
 108                 logger(LOG_ERR, "Can't bind to interface %s: %s", ifr.ifr_ifrn.ifrn_name, strerror(errno));
 109                 return false;
 110         }
 111
 112 #else /* if !defined(SOL_SOCKET) || !defined(SO_BINDTODEVICE) */
 113         logger(LOG_WARNING, "%s not supported on this platform", "BindToInterface");
 114 #endif
 115
 116         return true;
 117 }
 118
 119 int setup_listen_socket(const sockaddr_t *sa) {
 120         int nfd;
 121         char *addrstr;
 122         int option;
 123         char *iface;
 124
 125         nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
 126
 127         if(nfd < 0) {
 128                 ifdebug(STATUS) logger(LOG_ERR, "Creating metasocket failed: %s", sockstrerror(sockerrno));
 129                 return -1;
 130         }
 131
 132 #ifdef FD_CLOEXEC
 133         fcntl(nfd, F_SETFD, FD_CLOEXEC);
 134 #endif
 135
 136         /* Optimize TCP settings */
 137
 138         option = 1;
 139         setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof(option));
 140
 141 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
 142         if(sa->sa.sa_family == AF_INET6)
 143                 setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
 144 #endif
 145
 146         if(get_config_string(lookup_config(config_tree, "BindToInterface"), &iface)) {
 147 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
 148                 struct ifreq ifr;
 149
 150                 memset(&ifr, 0, sizeof(ifr));
 151                 strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
 152                 ifr.ifr_ifrn.ifrn_name[IFNAMSIZ - 1] = 0;
 153                 free(iface);
 154
 155                 if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr))) {
 156                         closesocket(nfd);
 157                         logger(LOG_ERR, "Can't bind to interface %s: %s", ifr.ifr_ifrn.ifrn_name, strerror(sockerrno));
 158                         return -1;
 159                 }
 160
 161 #else
 162                 logger(LOG_WARNING, "%s not supported on this platform", "BindToInterface");
 163 #endif
 164         }
 165
 166         if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
 167                 closesocket(nfd);
 168                 addrstr = sockaddr2hostname(sa);
 169                 logger(LOG_ERR, "Can't bind to %s/tcp: %s", addrstr, sockstrerror(sockerrno));
 170                 free(addrstr);
 171                 return -1;
 172         }
 173
 174         if(listen(nfd, 3)) {
 175                 closesocket(nfd);
 176                 logger(LOG_ERR, "System call `%s' failed: %s", "listen", sockstrerror(sockerrno));
 177                 return -1;
 178         }
 179
 180         return nfd;
 181 }
 182
 183 int setup_vpn_in_socket(const sockaddr_t *sa) {
 184         int nfd;
 185         char *addrstr;
 186         int option;
 187
 188         nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
 189
 190         if(nfd < 0) {
 191                 logger(LOG_ERR, "Creating UDP socket failed: %s", sockstrerror(sockerrno));
 192                 return -1;
 193         }
 194
 195 #ifdef FD_CLOEXEC
 196         fcntl(nfd, F_SETFD, FD_CLOEXEC);
 197 #endif
 198
 199 #ifdef O_NONBLOCK
 200         {
 201                 int flags = fcntl(nfd, F_GETFL);
 202
 203                 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
 204                         closesocket(nfd);
 205                         logger(LOG_ERR, "System call `%s' failed: %s", "fcntl",
 206                                    strerror(errno));
 207                         return -1;
 208                 }
 209         }
 210 #elif defined(WIN32)
 211         {
 212                 unsigned long arg = 1;
 213                 if(ioctlsocket(nfd, FIONBIO, &arg) != 0) {
 214                         closesocket(nfd);
 215                         logger(LOG_ERR, "Call to `%s' failed: %s", "ioctlsocket", sockstrerror(sockerrno));
 216                         return -1;
 217                 }
 218         }
 219 #endif
 220
 221         option = 1;
 222         setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof(option));
 223         setsockopt(nfd, SOL_SOCKET, SO_BROADCAST, (void *)&option, sizeof(option));
 224
 225         if(udp_rcvbuf && setsockopt(nfd, SOL_SOCKET, SO_RCVBUF, (void *)&udp_rcvbuf, sizeof(udp_rcvbuf)))
 226                 logger(LOG_WARNING, "Can't set UDP SO_RCVBUF to %i: %s", udp_rcvbuf, strerror(errno));
 227
 228         if(udp_sndbuf && setsockopt(nfd, SOL_SOCKET, SO_SNDBUF, (void *)&udp_sndbuf, sizeof(udp_sndbuf)))
 229                 logger(LOG_WARNING, "Can't set UDP SO_SNDBUF to %i: %s", udp_sndbuf, strerror(errno));
 230
 231 #if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
 232         if(sa->sa.sa_family == AF_INET6)
 233                 setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
 234 #endif
 235
 236 #if defined(IP_DONTFRAG) && !defined(IP_DONTFRAGMENT)
 237 #define IP_DONTFRAGMENT IP_DONTFRAG
 238 #endif
 239
 240 #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
 241         if(myself->options & OPTION_PMTU_DISCOVERY) {
 242                 option = IP_PMTUDISC_DO;
 243                 setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, (void *)&option, sizeof(option));
 244         }
 245 #elif defined(IPPROTO_IP) && defined(IP_DONTFRAGMENT)
 246         if(myself->options & OPTION_PMTU_DISCOVERY) {
 247                 option = 1;
 248                 setsockopt(nfd, IPPROTO_IP, IP_DONTFRAGMENT, (void *)&option, sizeof(option));
 249         }
 250 #endif
 251
 252 #if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
 253         if(myself->options & OPTION_PMTU_DISCOVERY) {
 254                 option = IPV6_PMTUDISC_DO;
 255                 setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, (void *)&option, sizeof(option));
 256         }
 257 #elif defined(IPPROTO_IPV6) && defined(IPV6_DONTFRAG)
 258         if(myself->options & OPTION_PMTU_DISCOVERY) {
 259                 option = 1;
 260                 setsockopt(nfd, IPPROTO_IPV6, IPV6_DONTFRAG, (void *)&option, sizeof(option));
 261         }
 262 #endif
 263
 264         if (!bind_to_interface(nfd)) {
 265                 closesocket(nfd);
 266                 return -1;
 267         }
 268
 269         if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
 270                 closesocket(nfd);
 271                 addrstr = sockaddr2hostname(sa);
 272                 logger(LOG_ERR, "Can't bind to %s/udp: %s", addrstr, sockstrerror(sockerrno));
 273                 free(addrstr);
 274                 return -1;
 275         }
 276
 277         return nfd;
 278 } /* int setup_vpn_in_socket */
 279
 280 void retry_outgoing(outgoing_t *outgoing) {
 281         outgoing->timeout += 5;
 282
 283         if(outgoing->timeout < mintimeout)
 284                 outgoing->timeout = mintimeout;
 285
 286         if(outgoing->timeout > maxtimeout)
 287                 outgoing->timeout = maxtimeout;
 288
 289         if(outgoing->event)
 290                 event_del(outgoing->event);
 291         outgoing->event = new_event();
 292         outgoing->event->handler = (event_handler_t) setup_outgoing_connection;
 293         outgoing->event->time = now + outgoing->timeout;
 294         outgoing->event->data = outgoing;
 295         event_add(outgoing->event);
 296
 297         ifdebug(CONNECTIONS) logger(LOG_NOTICE,
 298                            "Trying to re-establish outgoing connection in %d seconds",
 299                            outgoing->timeout);
 300 }
 301
 302 void finish_connecting(connection_t *c) {
 303         ifdebug(CONNECTIONS) logger(LOG_INFO, "Connected to %s (%s)", c->name, c->hostname);
 304
 305         c->last_ping_time = now;
 306
 307         send_id(c);
 308 }
 309
 310 static void do_outgoing_pipe(connection_t *c, char *command) {
 311 #ifndef HAVE_MINGW
 312         int fd[2];
 313
 314         if(socketpair(AF_UNIX, SOCK_STREAM, 0, fd)) {
 315                 logger(LOG_ERR, "Could not create socketpair: %s\n", strerror(errno));
 316                 return;
 317         }
 318
 319         if(fork()) {
 320                 c->socket = fd[0];
 321                 close(fd[1]);
 322                 ifdebug(CONNECTIONS) logger(LOG_DEBUG, "Using proxy %s", command);
 323                 return;
 324         }
 325
 326         close(0);
 327         close(1);
 328         close(fd[0]);
 329         dup2(fd[1], 0);
 330         dup2(fd[1], 1);
 331         close(fd[1]);
 332
 333         // Other filedescriptors should be closed automatically by CLOEXEC
 334
 335         char *host = NULL;
 336         char *port = NULL;
 337
 338         sockaddr2str(&c->address, &host, &port);
 339         setenv("REMOTEADDRESS", host, true);
 340         setenv("REMOTEPORT", port, true);
 341         setenv("NODE", c->name, true);
 342         setenv("NAME", myself->name, true);
 343         if(netname)
 344                 setenv("NETNAME", netname, true);
 345
 346         int result = system(command);
 347         if(result < 0)
 348                 logger(LOG_ERR, "Could not execute %s: %s\n", command, strerror(errno));
 349         else if(result)
 350                 logger(LOG_ERR, "%s exited with non-zero status %d", command, result);
 351         exit(result);
 352 #else
 353         logger(LOG_ERR, "Proxy type exec not supported on this platform!");
 354         return;
 355 #endif
 356 }
 357
 358 static bool is_valid_host_port(const char *host, const char *port) {
 359         for(const char *p = host; *p; p++)
 360                 if(!isalnum(*p) && *p != '-' && *p != '.')
 361                         return false;
 362
 363         for(const char *p = port; *p; p++)
 364                 if(!isalnum(*p))
 365                         return false;
 366
 367         return true;
 368 }
 369
 370 void do_outgoing_connection(connection_t *c) {
 371         struct addrinfo *proxyai = NULL;
 372         int result;
 373
 374         if(!c->outgoing) {
 375                 logger(LOG_ERR, "do_outgoing_connection() for %s called without c->outgoing", c->name);
 376                 abort();
 377         }
 378
 379 begin:
 380         if(!c->outgoing->ai) {
 381                 if(!c->outgoing->cfg) {
 382                         ifdebug(CONNECTIONS) logger(LOG_ERR, "Could not set up a meta connection to %s",
 383                                            c->name);
 384                         c->status.remove = true;
 385                         retry_outgoing(c->outgoing);
 386                         c->outgoing = NULL;
 387                         return;
 388                 }
 389
 390                 char *address, *port, *space;
 391
 392                 get_config_string(c->outgoing->cfg, &address);
 393
 394                 space = strchr(address, ' ');
 395                 if(space) {
 396                         port = xstrdup(space + 1);
 397                         *space = 0;
 398                 } else {
 399                         if(!get_config_string(lookup_config(c->config_tree, "Port"), &port))
 400                                 port = xstrdup("655");
 401                 }
 402
 403                 c->outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
 404
 405                 // If we cannot resolve the address, maybe we are using a proxy that can?
 406                 if(!c->outgoing->ai && proxytype != PROXY_NONE && is_valid_host_port(address, port)) {
 407                         memset(&c->address, 0, sizeof c->address);
 408                         c->address.sa.sa_family = AF_UNKNOWN;
 409                         c->address.unknown.address = address;
 410                         c->address.unknown.port = port;
 411                 } else {
 412                         free(address);
 413                         free(port);
 414                 }
 415
 416                 c->outgoing->aip = c->outgoing->ai;
 417                 c->outgoing->cfg = lookup_config_next(c->config_tree, c->outgoing->cfg);
 418
 419                 if(!c->outgoing->ai && proxytype != PROXY_NONE)
 420                         goto connect;
 421         }
 422
 423         if(!c->outgoing->aip) {
 424                 if(c->outgoing->ai)
 425                         freeaddrinfo(c->outgoing->ai);
 426                 c->outgoing->ai = NULL;
 427                 goto begin;
 428         }
 429
 430         memcpy(&c->address, c->outgoing->aip->ai_addr, c->outgoing->aip->ai_addrlen);
 431         c->outgoing->aip = c->outgoing->aip->ai_next;
 432
 433 connect:
 434         if(c->hostname)
 435                 free(c->hostname);
 436
 437         c->hostname = sockaddr2hostname(&c->address);
 438
 439         ifdebug(CONNECTIONS) logger(LOG_INFO, "Trying to connect to %s (%s)", c->name,
 440                            c->hostname);
 441
 442         if(!proxytype) {
 443                 c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
 444         } else if(proxytype == PROXY_EXEC) {
 445                 do_outgoing_pipe(c, proxyhost);
 446         } else {
 447                 proxyai = str2addrinfo(proxyhost, proxyport, SOCK_STREAM);
 448                 if(!proxyai)
 449                         goto begin;
 450                 ifdebug(CONNECTIONS) logger(LOG_INFO, "Using proxy at %s port %s", proxyhost, proxyport);
 451                 c->socket = socket(proxyai->ai_family, SOCK_STREAM, IPPROTO_TCP);
 452         }
 453
 454         if(c->socket == -1) {
 455                 ifdebug(CONNECTIONS) logger(LOG_ERR, "Creating socket for %s failed: %s", c->hostname, sockstrerror(sockerrno));
 456                 goto begin;
 457         }
 458
 459         if(proxytype != PROXY_EXEC)
 460                 configure_tcp(c);
 461
 462 #ifdef FD_CLOEXEC
 463         fcntl(c->socket, F_SETFD, FD_CLOEXEC);
 464 #endif
 465
 466         if(proxytype != PROXY_EXEC) {
 467 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
 468                 int option = 1;
 469                 if(c->address.sa.sa_family == AF_INET6)
 470                         setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
 471 #endif
 472
 473                 bind_to_interface(c->socket);
 474         }
 475
 476         int b = -1;
 477
 478         for(int i = 0; i < listen_sockets; i++) {
 479                 if(listen_socket[i].sa.sa.sa_family == c->address.sa.sa_family) {
 480                         if(b == -1) {
 481                                 b = i;
 482                         } else  {
 483                                 b = -1;
 484                                 break;
 485                         }
 486                 }
 487         }
 488
 489         if(b != -1) {
 490                 sockaddr_t sa = listen_socket[b].sa;
 491                 if(sa.sa.sa_family == AF_INET)
 492                         sa.in.sin_port = 0;
 493                 else if(sa.sa.sa_family == AF_INET6)
 494                         sa.in6.sin6_port = 0;
 495
 496                 if(bind(c->socket, &sa.sa, SALEN(sa.sa))) {
 497                         char *addrstr = sockaddr2hostname(&sa);
 498                         logger(LOG_ERR, "Can't bind to %s/tcp: %s", addrstr, sockstrerror(sockerrno));
 499                         free(addrstr);
 500                 }
 501         }
 502
 503         /* Connect */
 504
 505         if(!proxytype) {
 506                 result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
 507         } else if(proxytype == PROXY_EXEC) {
 508                 result = 0;
 509         } else {
 510                 result = connect(c->socket, proxyai->ai_addr, proxyai->ai_addrlen);
 511                 freeaddrinfo(proxyai);
 512         }
 513
 514         now = time(NULL);
 515
 516         if(result == -1) {
 517                 if(sockinprogress(sockerrno)) {
 518                         c->last_ping_time = now;
 519                         c->status.connecting = true;
 520                         return;
 521                 }
 522
 523                 closesocket(c->socket);
 524
 525                 ifdebug(CONNECTIONS) logger(LOG_ERR, "%s: %s", c->hostname, sockstrerror(sockerrno));
 526
 527                 goto begin;
 528         }
 529
 530         finish_connecting(c);
 531
 532         return;
 533 }
 534
 535 void setup_outgoing_connection(outgoing_t *outgoing) {
 536         connection_t *c;
 537         node_t *n;
 538
 539         outgoing->event = NULL;
 540
 541         n = lookup_node(outgoing->name);
 542
 543         if(n)
 544                 if(n->connection) {
 545                         ifdebug(CONNECTIONS) logger(LOG_INFO, "Already connected to %s", outgoing->name);
 546
 547                         n->connection->outgoing = outgoing;
 548                         return;
 549                 }
 550
 551         c = new_connection();
 552         c->name = xstrdup(outgoing->name);
 553         c->outcipher = myself->connection->outcipher;
 554         c->outdigest = myself->connection->outdigest;
 555         c->outmaclength = myself->connection->outmaclength;
 556         c->outcompression = myself->connection->outcompression;
 557
 558         init_configuration(&c->config_tree);
 559         read_connection_config(c);
 560
 561         outgoing->cfg = lookup_config(c->config_tree, "Address");
 562
 563         if(!outgoing->cfg) {
 564                 logger(LOG_ERR, "No address specified for %s", c->name);
 565                 free_connection(c);
 566                 return;
 567         }
 568
 569         c->outgoing = outgoing;
 570         c->last_ping_time = now;
 571
 572         connection_add(c);
 573
 574         do_outgoing_connection(c);
 575 }
 576
 577 /*
 578   accept a new tcp connect and create a
 579   new connection
 580 */
 581 bool handle_new_meta_connection(int sock) {
 582         connection_t *c;
 583         sockaddr_t sa;
 584         int fd;
 585         socklen_t len = sizeof(sa);
 586
 587         fd = accept(sock, &sa.sa, &len);
 588
 589         if(fd < 0) {
 590                 logger(LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
 591                 return false;
 592         }
 593
 594         sockaddrunmap(&sa);
 595
 596         c = new_connection();
 597         c->name = xstrdup("<unknown>");
 598         c->outcipher = myself->connection->outcipher;
 599         c->outdigest = myself->connection->outdigest;
 600         c->outmaclength = myself->connection->outmaclength;
 601         c->outcompression = myself->connection->outcompression;
 602
 603         c->address = sa;
 604         c->hostname = sockaddr2hostname(&sa);
 605         c->socket = fd;
 606         c->last_ping_time = now;
 607
 608         ifdebug(CONNECTIONS) logger(LOG_NOTICE, "Connection from %s", c->hostname);
 609
 610         configure_tcp(c);
 611
 612         connection_add(c);
 613
 614         c->allow_request = ID;
 615         send_id(c);
 616
 617         return true;
 618 }
 619
 620 static void free_outgoing(outgoing_t *outgoing) {
 621         if(outgoing->ai)
 622                 freeaddrinfo(outgoing->ai);
 623
 624         if(outgoing->name)
 625                 free(outgoing->name);
 626
 627         free(outgoing);
 628 }
 629
 630 void try_outgoing_connections(void) {
 631         static config_t *cfg = NULL;
 632         char *name;
 633         outgoing_t *outgoing;
 634
 635         outgoing_list = list_alloc((list_action_t)free_outgoing);
 636
 637         for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 638                 get_config_string(cfg, &name);
 639
 640                 if(!check_id(name)) {
 641                         logger(LOG_ERR,
 642                                    "Invalid name for outgoing connection in %s line %d",
 643                                    cfg->file, cfg->line);
 644                         free(name);
 645                         continue;
 646                 }
 647
 648                 outgoing = xmalloc_and_zero(sizeof(*outgoing));
 649                 outgoing->name = name;
 650                 list_insert_tail(outgoing_list, outgoing);
 651                 setup_outgoing_connection(outgoing);
 652         }
 653 }