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                   2000-2012 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 "list.h"
  28 #include "logger.h"
  29 #include "meta.h"
  30 #include "names.h"
  31 #include "net.h"
  32 #include "netutl.h"
  33 #include "protocol.h"
  34 #include "utils.h"
  35 #include "xalloc.h"
  36
  37 /* Needed on Mac OS/X */
  38 #ifndef SOL_TCP
  39 #define SOL_TCP IPPROTO_TCP
  40 #endif
  41
  42 int addressfamily = AF_UNSPEC;
  43 int maxtimeout = 900;
  44 int seconds_till_retry = 5;
  45 int udp_rcvbuf = 0;
  46 int udp_sndbuf = 0;
  47
  48 listen_socket_t listen_socket[MAXSOCKETS];
  49 int listen_sockets;
  50 list_t *outgoing_list = NULL;
  51
  52 /* Setup sockets */
  53
  54 static void configure_tcp(connection_t *c) {
  55         int option;
  56
  57 #ifdef O_NONBLOCK
  58         int flags = fcntl(c->socket, F_GETFL);
  59
  60         if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) {
  61                 logger(DEBUG_ALWAYS, LOG_ERR, "fcntl for %s: %s", c->hostname, strerror(errno));
  62         }
  63 #elif defined(WIN32)
  64         unsigned long arg = 1;
  65
  66         if(ioctlsocket(c->socket, FIONBIO, &arg) != 0) {
  67                 logger(DEBUG_ALWAYS, LOG_ERR, "ioctlsocket for %s: %s", c->hostname, sockstrerror(sockerrno));
  68         }
  69 #endif
  70
  71 #if defined(SOL_TCP) && defined(TCP_NODELAY)
  72         option = 1;
  73         setsockopt(c->socket, SOL_TCP, TCP_NODELAY, (void *)&option, sizeof option);
  74 #endif
  75
  76 #if defined(SOL_IP) && defined(IP_TOS) && defined(IPTOS_LOWDELAY)
  77         option = IPTOS_LOWDELAY;
  78         setsockopt(c->socket, SOL_IP, IP_TOS, (void *)&option, sizeof option);
  79 #endif
  80 }
  81
  82 static bool bind_to_interface(int sd) {
  83         char *iface;
  84
  85 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
  86         struct ifreq ifr;
  87         int status;
  88 #endif /* defined(SOL_SOCKET) && defined(SO_BINDTODEVICE) */
  89
  90         if(!get_config_string (lookup_config (config_tree, "BindToInterface"), &iface))
  91                 return true;
  92
  93 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
  94         memset(&ifr, 0, sizeof(ifr));
  95         strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
  96         ifr.ifr_ifrn.ifrn_name[IFNAMSIZ - 1] = 0;
  97
  98         status = setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr));
  99         if(status) {
 100                 logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to interface %s: %s", iface,
 101                                 strerror(errno));
 102                 return false;
 103         }
 104 #else /* if !defined(SOL_SOCKET) || !defined(SO_BINDTODEVICE) */
 105         logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "BindToInterface");
 106 #endif
 107
 108         return true;
 109 }
 110
 111 int setup_listen_socket(const sockaddr_t *sa) {
 112         int nfd;
 113         char *addrstr;
 114         int option;
 115         char *iface;
 116
 117         nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
 118
 119         if(nfd < 0) {
 120                 logger(DEBUG_STATUS, LOG_ERR, "Creating metasocket failed: %s", sockstrerror(sockerrno));
 121                 return -1;
 122         }
 123
 124 #ifdef FD_CLOEXEC
 125         fcntl(nfd, F_SETFD, FD_CLOEXEC);
 126 #endif
 127
 128         /* Optimize TCP settings */
 129
 130         option = 1;
 131         setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof option);
 132
 133 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
 134         if(sa->sa.sa_family == AF_INET6)
 135                 setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
 136 #endif
 137
 138         if(get_config_string
 139            (lookup_config(config_tree, "BindToInterface"), &iface)) {
 140 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
 141                 struct ifreq ifr;
 142
 143                 memset(&ifr, 0, sizeof ifr);
 144                 strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
 145
 146                 if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof ifr)) {
 147                         closesocket(nfd);
 148                         logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to interface %s: %s", iface,
 149                                    strerror(sockerrno));
 150                         return -1;
 151                 }
 152 #else
 153                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "BindToInterface");
 154 #endif
 155         }
 156
 157         if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
 158                 closesocket(nfd);
 159                 addrstr = sockaddr2hostname(sa);
 160                 logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to %s/tcp: %s", addrstr, sockstrerror(sockerrno));
 161                 free(addrstr);
 162                 return -1;
 163         }
 164
 165         if(listen(nfd, 3)) {
 166                 closesocket(nfd);
 167                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "listen", sockstrerror(sockerrno));
 168                 return -1;
 169         }
 170
 171         return nfd;
 172 }
 173
 174 int setup_vpn_in_socket(const sockaddr_t *sa) {
 175         int nfd;
 176         char *addrstr;
 177         int option;
 178
 179         nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
 180
 181         if(nfd < 0) {
 182                 logger(DEBUG_ALWAYS, LOG_ERR, "Creating UDP socket failed: %s", sockstrerror(sockerrno));
 183                 return -1;
 184         }
 185
 186 #ifdef FD_CLOEXEC
 187         fcntl(nfd, F_SETFD, FD_CLOEXEC);
 188 #endif
 189
 190 #ifdef O_NONBLOCK
 191         {
 192                 int flags = fcntl(nfd, F_GETFL);
 193
 194                 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
 195                         closesocket(nfd);
 196                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "fcntl",
 197                                    strerror(errno));
 198                         return -1;
 199                 }
 200         }
 201 #elif defined(WIN32)
 202         {
 203                 unsigned long arg = 1;
 204                 if(ioctlsocket(nfd, FIONBIO, &arg) != 0) {
 205                         closesocket(nfd);
 206                         logger(DEBUG_ALWAYS, LOG_ERR, "Call to `%s' failed: %s", "ioctlsocket", sockstrerror(sockerrno));
 207                         return -1;
 208                 }
 209         }
 210 #endif
 211
 212         option = 1;
 213         setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof option);
 214         setsockopt(nfd, SOL_SOCKET, SO_BROADCAST, (void *)&option, sizeof option);
 215
 216         if(udp_rcvbuf && setsockopt(nfd, SOL_SOCKET, SO_RCVBUF, (void *)&udp_rcvbuf, sizeof(udp_rcvbuf)))
 217                 logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_RCVBUF to %i: %s", udp_rcvbuf, strerror(errno));
 218
 219         if(udp_sndbuf && setsockopt(nfd, SOL_SOCKET, SO_SNDBUF, (void *)&udp_sndbuf, sizeof(udp_sndbuf)))
 220                 logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_SNDBUF to %i: %s", udp_sndbuf, strerror(errno));
 221
 222 #if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
 223         if(sa->sa.sa_family == AF_INET6)
 224                 setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
 225 #endif
 226
 227 #if defined(IP_DONTFRAG) && !defined(IP_DONTFRAGMENT)
 228 #define IP_DONTFRAGMENT IP_DONTFRAG
 229 #endif
 230
 231 #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
 232         if(myself->options & OPTION_PMTU_DISCOVERY) {
 233                 option = IP_PMTUDISC_DO;
 234                 setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, (void *)&option, sizeof(option));
 235         }
 236 #elif defined(IPPROTO_IP) && defined(IP_DONTFRAGMENT)
 237         if(myself->options & OPTION_PMTU_DISCOVERY) {
 238                 option = 1;
 239                 setsockopt(nfd, IPPROTO_IP, IP_DONTFRAGMENT, (void *)&option, sizeof(option));
 240         }
 241 #else
 242 #warning No way to disable IPv4 fragmentation
 243 #endif
 244
 245 #if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
 246         if(myself->options & OPTION_PMTU_DISCOVERY) {
 247                 option = IPV6_PMTUDISC_DO;
 248                 setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, (void *)&option, sizeof(option));
 249         }
 250 #elif defined(IPPROTO_IPV6) && defined(IPV6_DONTFRAG)
 251         if(myself->options & OPTION_PMTU_DISCOVERY) {
 252                 option = 1;
 253                 setsockopt(nfd, IPPROTO_IPV6, IPV6_DONTFRAG, (void *)&option, sizeof(option));
 254         }
 255 #else
 256 #warning No way to disable IPv6 fragmentation
 257 #endif
 258
 259         if (!bind_to_interface(nfd)) {
 260                 closesocket(nfd);
 261                 return -1;
 262         }
 263
 264         if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
 265                 closesocket(nfd);
 266                 addrstr = sockaddr2hostname(sa);
 267                 logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to %s/udp: %s", addrstr, sockstrerror(sockerrno));
 268                 free(addrstr);
 269                 return -1;
 270         }
 271
 272         return nfd;
 273 } /* int setup_vpn_in_socket */
 274
 275 static void retry_outgoing_handler(void *data) {
 276         setup_outgoing_connection(data);
 277 }
 278
 279 void retry_outgoing(outgoing_t *outgoing) {
 280         outgoing->timeout += 5;
 281
 282         if(outgoing->timeout > maxtimeout)
 283                 outgoing->timeout = maxtimeout;
 284
 285         timeout_add(&outgoing->ev, retry_outgoing_handler, outgoing, &(struct timeval){outgoing->timeout, rand() % 100000});
 286
 287         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Trying to re-establish outgoing connection in %d seconds", outgoing->timeout);
 288 }
 289
 290 void finish_connecting(connection_t *c) {
 291         logger(DEBUG_CONNECTIONS, LOG_INFO, "Connected to %s (%s)", c->name, c->hostname);
 292
 293         if(proxytype != PROXY_EXEC)
 294                 configure_tcp(c);
 295
 296         c->last_ping_time = time(NULL);
 297         c->status.connecting = false;
 298
 299         send_id(c);
 300 }
 301
 302 static void do_outgoing_pipe(connection_t *c, char *command) {
 303 #ifndef HAVE_MINGW
 304         int fd[2];
 305
 306         if(socketpair(AF_UNIX, SOCK_STREAM, 0, fd)) {
 307                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not create socketpair: %s", strerror(errno));
 308                 return;
 309         }
 310
 311         if(fork()) {
 312                 c->socket = fd[0];
 313                 close(fd[1]);
 314                 logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Using proxy %s", command);
 315                 return;
 316         }
 317
 318         close(0);
 319         close(1);
 320         close(fd[0]);
 321         dup2(fd[1], 0);
 322         dup2(fd[1], 1);
 323         close(fd[1]);
 324
 325         // Other filedescriptors should be closed automatically by CLOEXEC
 326
 327         char *host = NULL;
 328         char *port = NULL;
 329
 330         sockaddr2str(&c->address, &host, &port);
 331         setenv("REMOTEADDRESS", host, true);
 332         setenv("REMOTEPORT", port, true);
 333         setenv("NODE", c->name, true);
 334         setenv("NAME", myself->name, true);
 335         if(netname)
 336                 setenv("NETNAME", netname, true);
 337
 338         int result = system(command);
 339         if(result < 0)
 340                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not execute %s: %s", command, strerror(errno));
 341         else if(result)
 342                 logger(DEBUG_ALWAYS, LOG_ERR, "%s exited with non-zero status %d", command, result);
 343         exit(result);
 344 #else
 345         logger(DEBUG_ALWAYS, LOG_ERR, "Proxy type exec not supported on this platform!");
 346         return;
 347 #endif
 348 }
 349
 350 static void handle_meta_write(connection_t *c) {
 351         ssize_t outlen = send(c->socket, c->outbuf.data + c->outbuf.offset, c->outbuf.len - c->outbuf.offset, 0);
 352         if(outlen <= 0) {
 353                 if(!errno || errno == EPIPE) {
 354                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection closed by %s (%s)", c->name, c->hostname);
 355                 } else if(sockwouldblock(sockerrno)) {
 356                         logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Sending %d bytes to %s (%s) would block", c->outbuf.len - c->outbuf.offset, c->name, c->hostname);
 357                         return;
 358                 } else {
 359                         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));
 360                 }
 361
 362                 terminate_connection(c, c->status.active);
 363                 return;
 364         }
 365
 366         buffer_read(&c->outbuf, outlen);
 367         if(!c->outbuf.len)
 368                 io_set(&c->io, IO_READ);
 369 }
 370
 371 static void handle_meta_io(void *data, int flags) {
 372         if(flags & IO_WRITE)
 373                 handle_meta_write(data);
 374         else
 375                 handle_meta_connection_data(data);
 376 }
 377
 378 bool do_outgoing_connection(outgoing_t *outgoing) {
 379         char *address, *port, *space;
 380         struct addrinfo *proxyai = NULL;
 381         int result;
 382
 383 begin:
 384         if(!outgoing->ai) {
 385                 if(!outgoing->cfg) {
 386                         logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not set up a meta connection to %s", outgoing->name);
 387                         retry_outgoing(outgoing);
 388                         return false;
 389                 }
 390
 391                 get_config_string(outgoing->cfg, &address);
 392
 393                 space = strchr(address, ' ');
 394                 if(space) {
 395                         port = xstrdup(space + 1);
 396                         *space = 0;
 397                 } else {
 398                         if(!get_config_string(lookup_config(outgoing->config_tree, "Port"), &port))
 399                                 port = xstrdup("655");
 400                 }
 401
 402                 outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
 403                 free(address);
 404                 free(port);
 405
 406                 outgoing->aip = outgoing->ai;
 407                 outgoing->cfg = lookup_config_next(outgoing->config_tree, outgoing->cfg);
 408         }
 409
 410         if(!outgoing->aip) {
 411                 if(outgoing->ai)
 412                         freeaddrinfo(outgoing->ai);
 413                 outgoing->ai = NULL;
 414                 goto begin;
 415         }
 416
 417         connection_t *c = new_connection();
 418         c->outgoing = outgoing;
 419
 420         memcpy(&c->address, outgoing->aip->ai_addr, outgoing->aip->ai_addrlen);
 421         outgoing->aip = outgoing->aip->ai_next;
 422
 423         c->hostname = sockaddr2hostname(&c->address);
 424
 425         logger(DEBUG_CONNECTIONS, LOG_INFO, "Trying to connect to %s (%s)", outgoing->name, c->hostname);
 426
 427         if(!proxytype) {
 428                 c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
 429                 configure_tcp(c);
 430         } else if(proxytype == PROXY_EXEC) {
 431                 do_outgoing_pipe(c, proxyhost);
 432         } else {
 433                 proxyai = str2addrinfo(proxyhost, proxyport, SOCK_STREAM);
 434                 if(!proxyai) {
 435                         free_connection(c);
 436                         goto begin;
 437                 }
 438                 logger(DEBUG_CONNECTIONS, LOG_INFO, "Using proxy at %s port %s", proxyhost, proxyport);
 439                 c->socket = socket(proxyai->ai_family, SOCK_STREAM, IPPROTO_TCP);
 440         }
 441
 442         if(c->socket == -1) {
 443                 logger(DEBUG_CONNECTIONS, LOG_ERR, "Creating socket for %s failed: %s", c->hostname, sockstrerror(sockerrno));
 444                 free_connection(c);
 445                 goto begin;
 446         }
 447
 448 #ifdef FD_CLOEXEC
 449         fcntl(c->socket, F_SETFD, FD_CLOEXEC);
 450 #endif
 451
 452         if(proxytype != PROXY_EXEC) {
 453 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
 454                 int option = 1;
 455                 if(c->address.sa.sa_family == AF_INET6)
 456                         setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
 457 #endif
 458
 459                 bind_to_interface(c->socket);
 460         }
 461
 462         /* Connect */
 463
 464         if(!proxytype) {
 465                 result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
 466         } else if(proxytype == PROXY_EXEC) {
 467                 result = 0;
 468         } else {
 469                 result = connect(c->socket, proxyai->ai_addr, proxyai->ai_addrlen);
 470                 freeaddrinfo(proxyai);
 471         }
 472
 473         if(result == -1 && !sockinprogress(sockerrno)) {
 474                 logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not connect to %s (%s): %s", outgoing->name, c->hostname, sockstrerror(sockerrno));
 475                 free_connection(c);
 476
 477                 goto begin;
 478         }
 479
 480         /* Now that there is a working socket, fill in the rest and register this connection. */
 481
 482         c->status.connecting = true;
 483         c->name = xstrdup(outgoing->name);
 484         c->outcipher = myself->connection->outcipher;
 485         c->outdigest = myself->connection->outdigest;
 486         c->outmaclength = myself->connection->outmaclength;
 487         c->outcompression = myself->connection->outcompression;
 488         c->last_ping_time = time(NULL);
 489
 490         connection_add(c);
 491
 492         io_add(&c->io, handle_meta_io, c, c->socket, IO_READ);
 493
 494         return true;
 495 }
 496
 497 void setup_outgoing_connection(outgoing_t *outgoing) {
 498         timeout_del(&outgoing->ev);
 499
 500         node_t *n = lookup_node(outgoing->name);
 501
 502         if(n && n->connection) {
 503                 logger(DEBUG_CONNECTIONS, LOG_INFO, "Already connected to %s", outgoing->name);
 504
 505                 n->connection->outgoing = outgoing;
 506                 return;
 507         }
 508
 509         init_configuration(&outgoing->config_tree);
 510         read_host_config(outgoing->config_tree, outgoing->name);
 511         outgoing->cfg = lookup_config(outgoing->config_tree, "Address");
 512
 513         if(!outgoing->cfg) {
 514                 logger(DEBUG_ALWAYS, LOG_ERR, "No address specified for %s", outgoing->name);
 515                 return;
 516         }
 517
 518         do_outgoing_connection(outgoing);
 519 }
 520
 521 /*
 522   accept a new tcp connect and create a
 523   new connection
 524 */
 525 void handle_new_meta_connection(void *data, int flags) {
 526         listen_socket_t *l = data;
 527         connection_t *c;
 528         sockaddr_t sa;
 529         int fd;
 530         socklen_t len = sizeof sa;
 531
 532         fd = accept(l->tcp.fd, &sa.sa, &len);
 533
 534         if(fd < 0) {
 535                 logger(DEBUG_ALWAYS, LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
 536                 return;
 537         }
 538
 539         sockaddrunmap(&sa);
 540
 541         c = new_connection();
 542         c->name = xstrdup("<unknown>");
 543         c->outcipher = myself->connection->outcipher;
 544         c->outdigest = myself->connection->outdigest;
 545         c->outmaclength = myself->connection->outmaclength;
 546         c->outcompression = myself->connection->outcompression;
 547
 548         c->address = sa;
 549         c->hostname = sockaddr2hostname(&sa);
 550         c->socket = fd;
 551         c->last_ping_time = time(NULL);
 552
 553         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection from %s", c->hostname);
 554
 555         io_add(&c->io, handle_meta_io, c, c->socket, IO_READ);
 556
 557         configure_tcp(c);
 558
 559         connection_add(c);
 560
 561         c->allow_request = ID;
 562         send_id(c);
 563 }
 564
 565 static void free_outgoing(outgoing_t *outgoing) {
 566         timeout_del(&outgoing->ev);
 567
 568         if(outgoing->ai)
 569                 freeaddrinfo(outgoing->ai);
 570
 571         if(outgoing->config_tree)
 572                 exit_configuration(&outgoing->config_tree);
 573
 574         if(outgoing->name)
 575                 free(outgoing->name);
 576
 577         free(outgoing);
 578 }
 579
 580 void try_outgoing_connections(void) {
 581         /* If there is no outgoing list yet, create one. Otherwise, mark all outgoings as deleted. */
 582
 583         if(!outgoing_list) {
 584                 outgoing_list = list_alloc((list_action_t)free_outgoing);
 585         } else {
 586                 for list_each(outgoing_t, outgoing, outgoing_list)
 587                         outgoing->timeout = -1;
 588         }
 589
 590         /* Make sure there is one outgoing_t in the list for each ConnectTo. */
 591
 592         for(config_t *cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 593                 char *name;
 594                 get_config_string(cfg, &name);
 595
 596                 if(!check_id(name)) {
 597                         logger(DEBUG_ALWAYS, LOG_ERR,
 598                                    "Invalid name for outgoing connection in %s line %d",
 599                                    cfg->file, cfg->line);
 600                         free(name);
 601                         continue;
 602                 }
 603
 604                 bool found = false;
 605
 606                 for list_each(outgoing_t, outgoing, outgoing_list) {
 607                         if(!strcmp(outgoing->name, name)) {
 608                                 found = true;
 609                                 outgoing->timeout = 0;
 610                                 break;
 611                         }
 612                 }
 613
 614                 if(!found) {
 615                         outgoing_t *outgoing = xmalloc_and_zero(sizeof *outgoing);
 616                         outgoing->name = name;
 617                         list_insert_tail(outgoing_list, outgoing);
 618                         setup_outgoing_connection(outgoing);
 619                 }
 620         }
 621
 622         /* Terminate any connections whose outgoing_t is to be deleted. */
 623
 624         for list_each(connection_t, c, connection_list) {
 625                 if(c->outgoing && c->outgoing->timeout == -1) {
 626                         c->outgoing = NULL;
 627                         logger(DEBUG_CONNECTIONS, LOG_INFO, "No more outgoing connection to %s", c->name);
 628                         terminate_connection(c, c->status.active);
 629                 }
 630         }
 631
 632         /* Delete outgoing_ts for which there is no ConnectTo. */
 633
 634         for list_each(outgoing_t, outgoing, outgoing_list)
 635                 if(outgoing->timeout == -1)
 636                         list_delete_node(outgoing_list, node);
 637 }