www.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                   2000-2017 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
  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
  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
 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
 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
 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
 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
 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
 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
 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
 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 */
 641 bool handle_new_meta_connection(int sock) {
 642         connection_t *c;
 643         sockaddr_t sa;
 644         int fd;
 645         socklen_t len = sizeof(sa);
 646
 647         fd = accept(sock, &sa.sa, &len);
 648
 649         if(fd < 0) {
 650                 logger(LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
 651                 return false;
 652         }
 653
 654         sockaddrunmap(&sa);
 655
 656         c = new_connection();
 657         c->name = xstrdup("<unknown>");
 658         c->outcipher = myself->connection->outcipher;
 659         c->outdigest = myself->connection->outdigest;
 660         c->outmaclength = myself->connection->outmaclength;
 661         c->outcompression = myself->connection->outcompression;
 662
 663         c->address = sa;
 664         c->hostname = sockaddr2hostname(&sa);
 665         c->socket = fd;
 666         c->last_ping_time = now;
 667
 668         ifdebug(CONNECTIONS) logger(LOG_NOTICE, "Connection from %s", c->hostname);
 669
 670         configure_tcp(c);
 671
 672         connection_add(c);
 673
 674         c->allow_request = ID;
 675         send_id(c);
 676
 677         return true;
 678 }
 679
 680 static void free_outgoing(outgoing_t *outgoing) {
 681         if(outgoing->ai) {
 682                 freeaddrinfo(outgoing->ai);
 683         }
 684
 685         if(outgoing->name) {
 686                 free(outgoing->name);
 687         }
 688
 689         free(outgoing);
 690 }
 691
 692 void try_outgoing_connections(void) {
 693         static config_t *cfg = NULL;
 694         char *name;
 695         outgoing_t *outgoing;
 696
 697         outgoing_list = list_alloc((list_action_t)free_outgoing);
 698
 699         for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 700                 get_config_string(cfg, &name);
 701
 702                 if(!check_id(name)) {
 703                         logger(LOG_ERR,
 704                                "Invalid name for outgoing connection in %s line %d",
 705                                cfg->file, cfg->line);
 706                         free(name);
 707                         continue;
 708                 }
 709
 710                 outgoing = xmalloc_and_zero(sizeof(*outgoing));
 711                 outgoing->name = name;
 712                 list_insert_tail(outgoing_list, outgoing);
 713                 setup_outgoing_connection(outgoing);
 714         }
 715 }