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 "logger.h"
  28 #include "meta.h"
  29 #include "net.h"
  30 #include "netutl.h"
  31 #include "protocol.h"
  32 #include "utils.h"
  33 #include "xalloc.h"
  34
  35 /* Needed on Mac OS/X */
  36 #ifndef SOL_TCP
  37 #define SOL_TCP IPPROTO_TCP
  38 #endif
  39
  40 int addressfamily = AF_UNSPEC;
  41 int maxtimeout = 900;
  42 int seconds_till_retry = 5;
  43 int udp_rcvbuf = 0;
  44 int udp_sndbuf = 0;
  45
  46 listen_socket_t listen_socket[MAXSOCKETS];
  47 int listen_sockets;
  48 list_t *outgoing_list = NULL;
  49
  50 /* Setup sockets */
  51
  52 static void configure_tcp(connection_t *c) {
  53         int option;
  54
  55 #ifdef O_NONBLOCK
  56         int flags = fcntl(c->socket, F_GETFL);
  57
  58         if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) {
  59                 logger(DEBUG_ALWAYS, LOG_ERR, "fcntl for %s: %s", c->hostname, strerror(errno));
  60         }
  61 #elif defined(WIN32)
  62         unsigned long arg = 1;
  63
  64         if(ioctlsocket(c->socket, FIONBIO, &arg) != 0) {
  65                 logger(DEBUG_ALWAYS, LOG_ERR, "ioctlsocket for %s: %d", c->hostname, sockstrerror(sockerrno));
  66         }
  67 #endif
  68
  69 #if defined(SOL_TCP) && defined(TCP_NODELAY)
  70         option = 1;
  71         setsockopt(c->socket, SOL_TCP, TCP_NODELAY, (void *)&option, sizeof option);
  72 #endif
  73
  74 #if defined(SOL_IP) && defined(IP_TOS) && defined(IPTOS_LOWDELAY)
  75         option = IPTOS_LOWDELAY;
  76         setsockopt(c->socket, SOL_IP, IP_TOS, (void *)&option, sizeof option);
  77 #endif
  78 }
  79
  80 static bool bind_to_interface(int sd) {
  81         char *iface;
  82
  83 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
  84         struct ifreq ifr;
  85         int status;
  86 #endif /* defined(SOL_SOCKET) && defined(SO_BINDTODEVICE) */
  87
  88         if(!get_config_string (lookup_config (config_tree, "BindToInterface"), &iface))
  89                 return true;
  90
  91 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
  92         memset(&ifr, 0, sizeof(ifr));
  93         strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
  94         ifr.ifr_ifrn.ifrn_name[IFNAMSIZ - 1] = 0;
  95
  96         status = setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr));
  97         if(status) {
  98                 logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to interface %s: %s", iface,
  99                                 strerror(errno));
 100                 return false;
 101         }
 102 #else /* if !defined(SOL_SOCKET) || !defined(SO_BINDTODEVICE) */
 103         logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "BindToInterface");
 104 #endif
 105
 106         return true;
 107 }
 108
 109 int setup_listen_socket(const sockaddr_t *sa) {
 110         int nfd;
 111         char *addrstr;
 112         int option;
 113         char *iface;
 114
 115         nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
 116
 117         if(nfd < 0) {
 118                 logger(DEBUG_STATUS, LOG_ERR, "Creating metasocket failed: %s", sockstrerror(sockerrno));
 119                 return -1;
 120         }
 121
 122 #ifdef FD_CLOEXEC
 123         fcntl(nfd, F_SETFD, FD_CLOEXEC);
 124 #endif
 125
 126         /* Optimize TCP settings */
 127
 128         option = 1;
 129         setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof option);
 130
 131 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
 132         if(sa->sa.sa_family == AF_INET6)
 133                 setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
 134 #endif
 135
 136         if(get_config_string
 137            (lookup_config(config_tree, "BindToInterface"), &iface)) {
 138 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
 139                 struct ifreq ifr;
 140
 141                 memset(&ifr, 0, sizeof ifr);
 142                 strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
 143
 144                 if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof ifr)) {
 145                         closesocket(nfd);
 146                         logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to interface %s: %s", iface,
 147                                    strerror(sockerrno));
 148                         return -1;
 149                 }
 150 #else
 151                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "BindToInterface");
 152 #endif
 153         }
 154
 155         if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
 156                 closesocket(nfd);
 157                 addrstr = sockaddr2hostname(sa);
 158                 logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to %s/tcp: %s", addrstr, sockstrerror(sockerrno));
 159                 free(addrstr);
 160                 return -1;
 161         }
 162
 163         if(listen(nfd, 3)) {
 164                 closesocket(nfd);
 165                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "listen", sockstrerror(sockerrno));
 166                 return -1;
 167         }
 168
 169         return nfd;
 170 }
 171
 172 int setup_vpn_in_socket(const sockaddr_t *sa) {
 173         int nfd;
 174         char *addrstr;
 175         int option;
 176
 177         nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
 178
 179         if(nfd < 0) {
 180                 logger(DEBUG_ALWAYS, LOG_ERR, "Creating UDP socket failed: %s", sockstrerror(sockerrno));
 181                 return -1;
 182         }
 183
 184 #ifdef FD_CLOEXEC
 185         fcntl(nfd, F_SETFD, FD_CLOEXEC);
 186 #endif
 187
 188 #ifdef O_NONBLOCK
 189         {
 190                 int flags = fcntl(nfd, F_GETFL);
 191
 192                 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
 193                         closesocket(nfd);
 194                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "fcntl",
 195                                    strerror(errno));
 196                         return -1;
 197                 }
 198         }
 199 #elif defined(WIN32)
 200         {
 201                 unsigned long arg = 1;
 202                 if(ioctlsocket(nfd, FIONBIO, &arg) != 0) {
 203                         closesocket(nfd);
 204                         logger(DEBUG_ALWAYS, LOG_ERR, "Call to `%s' failed: %s", "ioctlsocket", sockstrerror(sockerrno));
 205                         return -1;
 206                 }
 207         }
 208 #endif
 209
 210         option = 1;
 211         setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof option);
 212         setsockopt(nfd, SOL_SOCKET, SO_BROADCAST, (void *)&option, sizeof option);
 213
 214         if(udp_rcvbuf && setsockopt(nfd, SOL_SOCKET, SO_RCVBUF, (void *)&udp_rcvbuf, sizeof(udp_rcvbuf)))
 215                 logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_RCVBUF to %i: %s", udp_rcvbuf, strerror(errno));
 216
 217         if(udp_sndbuf && setsockopt(nfd, SOL_SOCKET, SO_SNDBUF, (void *)&udp_sndbuf, sizeof(udp_sndbuf)))
 218                 logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_SNDBUF to %i: %s", udp_sndbuf, strerror(errno));
 219
 220 #if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
 221         if(sa->sa.sa_family == AF_INET6)
 222                 setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
 223 #endif
 224
 225 #if defined(IP_DONTFRAG) && !defined(IP_DONTFRAGMENT)
 226 #define IP_DONTFRAGMENT IP_DONTFRAG
 227 #endif
 228
 229 #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
 230         if(myself->options & OPTION_PMTU_DISCOVERY) {
 231                 option = IP_PMTUDISC_DO;
 232                 setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, (void *)&option, sizeof(option));
 233         }
 234 #elif defined(IPPROTO_IP) && defined(IP_DONTFRAGMENT)
 235         if(myself->options & OPTION_PMTU_DISCOVERY) {
 236                 option = 1;
 237                 setsockopt(nfd, IPPROTO_IP, IP_DONTFRAGMENT, (void *)&option, sizeof(option));
 238         }
 239 #else
 240 #warning No way to disable IPv4 fragmentation
 241 #endif
 242
 243 #if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
 244         if(myself->options & OPTION_PMTU_DISCOVERY) {
 245                 option = IPV6_PMTUDISC_DO;
 246                 setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, (void *)&option, sizeof(option));
 247         }
 248 #elif defined(IPPROTO_IPV6) && defined(IPV6_DONTFRAG)
 249         if(myself->options & OPTION_PMTU_DISCOVERY) {
 250                 option = 1;
 251                 setsockopt(nfd, IPPROTO_IPV6, IPV6_DONTFRAG, (void *)&option, sizeof(option));
 252         }
 253 #else
 254 #warning No way to disable IPv6 fragmentation
 255 #endif
 256
 257         if (!bind_to_interface(nfd)) {
 258                 closesocket(nfd);
 259                 return -1;
 260         }
 261
 262         if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
 263                 closesocket(nfd);
 264                 addrstr = sockaddr2hostname(sa);
 265                 logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to %s/udp: %s", addrstr, sockstrerror(sockerrno));
 266                 free(addrstr);
 267                 return -1;
 268         }
 269
 270         return nfd;
 271 } /* int setup_vpn_in_socket */
 272
 273 static void retry_outgoing_handler(int fd, short events, void *data) {
 274         setup_outgoing_connection(data);
 275 }
 276
 277 void retry_outgoing(outgoing_t *outgoing) {
 278         outgoing->timeout += 5;
 279
 280         if(outgoing->timeout > maxtimeout)
 281                 outgoing->timeout = maxtimeout;
 282
 283         timeout_set(&outgoing->ev, retry_outgoing_handler, outgoing);
 284         event_add(&outgoing->ev, &(struct timeval){outgoing->timeout, 0});
 285
 286         logger(DEBUG_CONNECTIONS, LOG_NOTICE,
 287                            "Trying to re-establish outgoing connection in %d seconds",
 288                            outgoing->timeout);
 289 }
 290
 291 void finish_connecting(connection_t *c) {
 292         logger(DEBUG_CONNECTIONS, LOG_INFO, "Connected to %s (%s)", c->name, c->hostname);
 293
 294         if(proxytype != PROXY_EXEC)
 295                 configure_tcp(c);
 296
 297         c->last_ping_time = time(NULL);
 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(int sock, short events, void *data) {
 352         connection_t *c = data;
 353
 354         ssize_t outlen = send(c->socket, c->outbuf.data + c->outbuf.offset, c->outbuf.len - c->outbuf.offset, 0);
 355         if(outlen <= 0) {
 356                 if(!errno || errno == EPIPE) {
 357                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection closed by %s (%s)", c->name, c->hostname);
 358                 } else if(sockwouldblock(sockerrno)) {
 359                         logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Sending %d bytes to %s (%s) would block", c->outbuf.len - c->outbuf.offset, c->name, c->hostname);
 360                         return;
 361                 } else {
 362                         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));
 363                 }
 364
 365                 terminate_connection(c, c->status.active);
 366                 return;
 367         }
 368
 369         buffer_read(&c->outbuf, outlen);
 370         if(!c->outbuf.len && event_initialized(&c->outevent))
 371                 event_del(&c->outevent);
 372 }
 373
 374
 375 bool do_outgoing_connection(outgoing_t *outgoing) {
 376         char *address, *port, *space;
 377         struct addrinfo *proxyai = NULL;
 378         int result;
 379
 380 begin:
 381         if(!outgoing->ai) {
 382                 if(!outgoing->cfg) {
 383                         logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not set up a meta connection to %s", outgoing->name);
 384                         retry_outgoing(outgoing);
 385                         return false;
 386                 }
 387
 388                 get_config_string(outgoing->cfg, &address);
 389
 390                 space = strchr(address, ' ');
 391                 if(space) {
 392                         port = xstrdup(space + 1);
 393                         *space = 0;
 394                 } else {
 395                         if(!get_config_string(lookup_config(outgoing->config_tree, "Port"), &port))
 396                                 port = xstrdup("655");
 397                 }
 398
 399                 outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
 400                 free(address);
 401                 free(port);
 402
 403                 outgoing->aip = outgoing->ai;
 404                 outgoing->cfg = lookup_config_next(outgoing->config_tree, outgoing->cfg);
 405         }
 406
 407         if(!outgoing->aip) {
 408                 if(outgoing->ai)
 409                         freeaddrinfo(outgoing->ai);
 410                 outgoing->ai = NULL;
 411                 goto begin;
 412         }
 413
 414         connection_t *c = new_connection();
 415         c->outgoing = outgoing;
 416
 417         memcpy(&c->address, outgoing->aip->ai_addr, outgoing->aip->ai_addrlen);
 418         outgoing->aip = outgoing->aip->ai_next;
 419
 420         c->hostname = sockaddr2hostname(&c->address);
 421
 422         logger(DEBUG_CONNECTIONS, LOG_INFO, "Trying to connect to %s (%s)", outgoing->name, c->hostname);
 423
 424         if(!proxytype) {
 425                 c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
 426                 configure_tcp(c);
 427         } else if(proxytype == PROXY_EXEC) {
 428                 do_outgoing_pipe(c, proxyhost);
 429         } else {
 430                 proxyai = str2addrinfo(proxyhost, proxyport, SOCK_STREAM);
 431                 if(!proxyai) {
 432                         free_connection(c);
 433                         goto begin;
 434                 }
 435                 logger(DEBUG_CONNECTIONS, LOG_INFO, "Using proxy at %s port %s", proxyhost, proxyport);
 436                 c->socket = socket(proxyai->ai_family, SOCK_STREAM, IPPROTO_TCP);
 437         }
 438
 439         if(c->socket == -1) {
 440                 logger(DEBUG_CONNECTIONS, LOG_ERR, "Creating socket for %s failed: %s", c->hostname, sockstrerror(sockerrno));
 441                 free_connection(c);
 442                 goto begin;
 443         }
 444
 445 #ifdef FD_CLOEXEC
 446         fcntl(c->socket, F_SETFD, FD_CLOEXEC);
 447 #endif
 448
 449         if(proxytype != PROXY_EXEC) {
 450 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
 451                 int option = 1;
 452                 if(c->address.sa.sa_family == AF_INET6)
 453                         setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
 454 #endif
 455
 456                 bind_to_interface(c->socket);
 457         }
 458
 459         /* Connect */
 460
 461         if(!proxytype) {
 462                 result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
 463         } else if(proxytype == PROXY_EXEC) {
 464                 result = 0;
 465         } else {
 466                 result = connect(c->socket, proxyai->ai_addr, proxyai->ai_addrlen);
 467                 freeaddrinfo(proxyai);
 468         }
 469
 470         if(result == -1 && !sockinprogress(sockerrno)) {
 471                 logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not connect to %s (%s): %s", outgoing->name, c->hostname, sockstrerror(sockerrno));
 472                 free_connection(c);
 473
 474                 goto begin;
 475         }
 476
 477         /* Now that there is a working socket, fill in the rest and register this connection. */
 478
 479         c->status.connecting = true;
 480         c->name = xstrdup(outgoing->name);
 481         c->outcipher = myself->connection->outcipher;
 482         c->outdigest = myself->connection->outdigest;
 483         c->outmaclength = myself->connection->outmaclength;
 484         c->outcompression = myself->connection->outcompression;
 485         c->last_ping_time = time(NULL);
 486
 487         connection_add(c);
 488
 489         event_set(&c->inevent, c->socket, EV_READ | EV_PERSIST, handle_meta_connection_data, c);
 490         event_set(&c->outevent, c->socket, EV_WRITE | EV_PERSIST, handle_meta_write, c);
 491         event_add(&c->inevent, NULL);
 492
 493         return true;
 494 }
 495
 496 void setup_outgoing_connection(outgoing_t *outgoing) {
 497         if(event_initialized(&outgoing->ev))
 498                 event_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(int sock, short events, void *data) {
 526         connection_t *c;
 527         sockaddr_t sa;
 528         int fd;
 529         socklen_t len = sizeof sa;
 530
 531         fd = accept(sock, &sa.sa, &len);
 532
 533         if(fd < 0) {
 534                 logger(DEBUG_ALWAYS, LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
 535                 return;
 536         }
 537
 538         sockaddrunmap(&sa);
 539
 540         c = new_connection();
 541         c->name = xstrdup("<unknown>");
 542         c->outcipher = myself->connection->outcipher;
 543         c->outdigest = myself->connection->outdigest;
 544         c->outmaclength = myself->connection->outmaclength;
 545         c->outcompression = myself->connection->outcompression;
 546
 547         c->address = sa;
 548         c->hostname = sockaddr2hostname(&sa);
 549         c->socket = fd;
 550         c->last_ping_time = time(NULL);
 551
 552         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection from %s", c->hostname);
 553
 554         event_set(&c->inevent, c->socket, EV_READ | EV_PERSIST, handle_meta_connection_data, c);
 555         event_set(&c->outevent, c->socket, EV_WRITE | EV_PERSIST, handle_meta_write, c);
 556         event_add(&c->inevent, NULL);
 557
 558         configure_tcp(c);
 559
 560         connection_add(c);
 561
 562         c->allow_request = ID;
 563         send_id(c);
 564 }
 565
 566 static void free_outgoing(outgoing_t *outgoing) {
 567         if(event_initialized(&outgoing->ev))
 568                 event_del(&outgoing->ev);
 569
 570         if(outgoing->ai)
 571                 freeaddrinfo(outgoing->ai);
 572
 573         if(outgoing->name)
 574                 free(outgoing->name);
 575
 576         free(outgoing);
 577 }
 578
 579 void try_outgoing_connections(void) {
 580         static config_t *cfg = NULL;
 581         char *name;
 582         outgoing_t *outgoing;
 583
 584         /* If there is no outgoing list yet, create one. Otherwise, mark all outgoings as deleted. */
 585
 586         if(!outgoing_list) {
 587                 outgoing_list = list_alloc((list_action_t)free_outgoing);
 588         } else {
 589                 for(list_node_t *i = outgoing_list->head; i; i = i->next) {
 590                         outgoing = i->data;
 591                         outgoing->timeout = -1;
 592                 }
 593         }
 594
 595         /* Make sure there is one outgoing_t in the list for each ConnectTo. */
 596
 597         for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 598                 get_config_string(cfg, &name);
 599
 600                 if(!check_id(name)) {
 601                         logger(DEBUG_ALWAYS, LOG_ERR,
 602                                    "Invalid name for outgoing connection in %s line %d",
 603                                    cfg->file, cfg->line);
 604                         free(name);
 605                         continue;
 606                 }
 607
 608                 bool found = false;
 609
 610                 for(list_node_t *i = outgoing_list->head; i; i = i->next) {
 611                         outgoing = i->data;
 612                         if(!strcmp(outgoing->name, name)) {
 613                                 found = true;
 614                                 outgoing->timeout = 0;
 615                                 break;
 616                         }
 617                 }
 618
 619                 if(!found) {
 620                         outgoing = xmalloc_and_zero(sizeof *outgoing);
 621                         outgoing->name = name;
 622                         list_insert_tail(outgoing_list, outgoing);
 623                         setup_outgoing_connection(outgoing);
 624                 }
 625         }
 626
 627         /* Terminate any connections whose outgoing_t is to be deleted. */
 628
 629         for(list_node_t *node = connection_list->head, *next; node; node = next) {
 630                 next = node->next;
 631                 connection_t *c = node->data;
 632                 if(c->outgoing && c->outgoing->timeout == -1) {
 633                         c->outgoing = NULL;
 634                         logger(DEBUG_CONNECTIONS, LOG_INFO, "No more outgoing connection to %s", c->name);
 635                         terminate_connection(c, c->status.active);
 636                 }
 637         }
 638
 639         /* Delete outgoing_ts for which there is no ConnectTo. */
 640
 641         for(list_node_t *node = outgoing_list->head, *next; node; node = next) {
 642                 next = node->next;
 643                 outgoing = node->data;
 644                 if(outgoing->timeout == -1)
 645                         list_delete_node(outgoing_list, node);
 646         }
 647 }