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(SOL_IP) && defined(IP_TOS) && defined(IPTOS_LOWDELAY)
  81         option = IPTOS_LOWDELAY;
  82         setsockopt(c->socket, SOL_IP, IP_TOS, (void *)&option, sizeof(option));
  83 #endif
  84
  85 #if defined(IPPROTO_IPV6) && 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(SOL_IPV6) && defined(IPV6_V6ONLY)
 146
 147         if(sa->sa.sa_family == AF_INET6) {
 148                 setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof(option));
 149         }
 150
 151 #endif
 152
 153         if(get_config_string(lookup_config(config_tree, "BindToInterface"), &iface)) {
 154 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
 155                 struct ifreq ifr;
 156
 157                 memset(&ifr, 0, sizeof(ifr));
 158                 strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
 159                 ifr.ifr_ifrn.ifrn_name[IFNAMSIZ - 1] = 0;
 160                 free(iface);
 161
 162                 if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr))) {
 163                         closesocket(nfd);
 164                         logger(LOG_ERR, "Can't bind to interface %s: %s", ifr.ifr_ifrn.ifrn_name, strerror(sockerrno));
 165                         return -1;
 166                 }
 167
 168 #else
 169                 logger(LOG_WARNING, "%s not supported on this platform", "BindToInterface");
 170 #endif
 171         }
 172
 173         if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
 174                 closesocket(nfd);
 175                 addrstr = sockaddr2hostname(sa);
 176                 logger(LOG_ERR, "Can't bind to %s/tcp: %s", addrstr, sockstrerror(sockerrno));
 177                 free(addrstr);
 178                 return -1;
 179         }
 180
 181         if(listen(nfd, 3)) {
 182                 closesocket(nfd);
 183                 logger(LOG_ERR, "System call `%s' failed: %s", "listen", sockstrerror(sockerrno));
 184                 return -1;
 185         }
 186
 187         return nfd;
 188 }
 189
 190 int setup_vpn_in_socket(const sockaddr_t *sa) {
 191         int nfd;
 192         char *addrstr;
 193         int option;
 194
 195         nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
 196
 197         if(nfd < 0) {
 198                 logger(LOG_ERR, "Creating UDP socket failed: %s", sockstrerror(sockerrno));
 199                 return -1;
 200         }
 201
 202 #ifdef FD_CLOEXEC
 203         fcntl(nfd, F_SETFD, FD_CLOEXEC);
 204 #endif
 205
 206 #ifdef O_NONBLOCK
 207         {
 208                 int flags = fcntl(nfd, F_GETFL);
 209
 210                 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
 211                         closesocket(nfd);
 212                         logger(LOG_ERR, "System call `%s' failed: %s", "fcntl",
 213                                strerror(errno));
 214                         return -1;
 215                 }
 216         }
 217 #elif defined(WIN32)
 218         {
 219                 unsigned long arg = 1;
 220
 221                 if(ioctlsocket(nfd, FIONBIO, &arg) != 0) {
 222                         closesocket(nfd);
 223                         logger(LOG_ERR, "Call to `%s' failed: %s", "ioctlsocket", sockstrerror(sockerrno));
 224                         return -1;
 225                 }
 226         }
 227 #endif
 228
 229         option = 1;
 230         setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof(option));
 231         setsockopt(nfd, SOL_SOCKET, SO_BROADCAST, (void *)&option, sizeof(option));
 232
 233         if(udp_rcvbuf && setsockopt(nfd, SOL_SOCKET, SO_RCVBUF, (void *)&udp_rcvbuf, sizeof(udp_rcvbuf))) {
 234                 logger(LOG_WARNING, "Can't set UDP SO_RCVBUF to %i: %s", udp_rcvbuf, strerror(errno));
 235         }
 236
 237         if(udp_sndbuf && setsockopt(nfd, SOL_SOCKET, SO_SNDBUF, (void *)&udp_sndbuf, sizeof(udp_sndbuf))) {
 238                 logger(LOG_WARNING, "Can't set UDP SO_SNDBUF to %i: %s", udp_sndbuf, strerror(errno));
 239         }
 240
 241 #if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
 242
 243         if(sa->sa.sa_family == AF_INET6) {
 244                 setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof(option));
 245         }
 246
 247 #endif
 248
 249 #if defined(IP_DONTFRAG) && !defined(IP_DONTFRAGMENT)
 250 #define IP_DONTFRAGMENT IP_DONTFRAG
 251 #endif
 252
 253 #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
 254
 255         if(myself->options & OPTION_PMTU_DISCOVERY) {
 256                 option = IP_PMTUDISC_DO;
 257                 setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, (void *)&option, sizeof(option));
 258         }
 259
 260 #elif defined(IPPROTO_IP) && defined(IP_DONTFRAGMENT)
 261
 262         if(myself->options & OPTION_PMTU_DISCOVERY) {
 263                 option = 1;
 264                 setsockopt(nfd, IPPROTO_IP, IP_DONTFRAGMENT, (void *)&option, sizeof(option));
 265         }
 266
 267 #endif
 268
 269 #if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
 270
 271         if(myself->options & OPTION_PMTU_DISCOVERY) {
 272                 option = IPV6_PMTUDISC_DO;
 273                 setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, (void *)&option, sizeof(option));
 274         }
 275
 276 #elif defined(IPPROTO_IPV6) && defined(IPV6_DONTFRAG)
 277
 278         if(myself->options & OPTION_PMTU_DISCOVERY) {
 279                 option = 1;
 280                 setsockopt(nfd, IPPROTO_IPV6, IPV6_DONTFRAG, (void *)&option, sizeof(option));
 281         }
 282
 283 #endif
 284
 285         if(!bind_to_interface(nfd)) {
 286                 closesocket(nfd);
 287                 return -1;
 288         }
 289
 290         if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
 291                 closesocket(nfd);
 292                 addrstr = sockaddr2hostname(sa);
 293                 logger(LOG_ERR, "Can't bind to %s/udp: %s", addrstr, sockstrerror(sockerrno));
 294                 free(addrstr);
 295                 return -1;
 296         }
 297
 298         return nfd;
 299 } /* int setup_vpn_in_socket */
 300
 301 void retry_outgoing(outgoing_t *outgoing) {
 302         outgoing->timeout += 5;
 303
 304         if(outgoing->timeout < mintimeout) {
 305                 outgoing->timeout = mintimeout;
 306         }
 307
 308         if(outgoing->timeout > maxtimeout) {
 309                 outgoing->timeout = maxtimeout;
 310         }
 311
 312         if(outgoing->event) {
 313                 event_del(outgoing->event);
 314         }
 315
 316         outgoing->event = new_event();
 317         outgoing->event->handler = (event_handler_t) setup_outgoing_connection;
 318         outgoing->event->time = now + outgoing->timeout;
 319         outgoing->event->data = outgoing;
 320         event_add(outgoing->event);
 321
 322         ifdebug(CONNECTIONS) logger(LOG_NOTICE,
 323                                     "Trying to re-establish outgoing connection in %d seconds",
 324                                     outgoing->timeout);
 325 }
 326
 327 void finish_connecting(connection_t *c) {
 328         ifdebug(CONNECTIONS) logger(LOG_INFO, "Connected to %s (%s)", c->name, c->hostname);
 329
 330         c->last_ping_time = now;
 331
 332         send_id(c);
 333 }
 334
 335 static void do_outgoing_pipe(connection_t *c, char *command) {
 336 #ifndef HAVE_MINGW
 337         int fd[2];
 338
 339         if(socketpair(AF_UNIX, SOCK_STREAM, 0, fd)) {
 340                 logger(LOG_ERR, "Could not create socketpair: %s\n", strerror(errno));
 341                 return;
 342         }
 343
 344         if(fork()) {
 345                 c->socket = fd[0];
 346                 close(fd[1]);
 347                 ifdebug(CONNECTIONS) logger(LOG_DEBUG, "Using proxy %s", command);
 348                 return;
 349         }
 350
 351         close(0);
 352         close(1);
 353         close(fd[0]);
 354         dup2(fd[1], 0);
 355         dup2(fd[1], 1);
 356         close(fd[1]);
 357
 358         // Other filedescriptors should be closed automatically by CLOEXEC
 359
 360         char *host = NULL;
 361         char *port = NULL;
 362
 363         sockaddr2str(&c->address, &host, &port);
 364         setenv("REMOTEADDRESS", host, true);
 365         setenv("REMOTEPORT", port, true);
 366         setenv("NODE", c->name, true);
 367         setenv("NAME", myself->name, true);
 368
 369         if(netname) {
 370                 setenv("NETNAME", netname, true);
 371         }
 372
 373         int result = system(command);
 374
 375         if(result < 0) {
 376                 logger(LOG_ERR, "Could not execute %s: %s\n", command, strerror(errno));
 377         } else if(result) {
 378                 logger(LOG_ERR, "%s exited with non-zero status %d", command, result);
 379         }
 380
 381         exit(result);
 382 #else
 383         logger(LOG_ERR, "Proxy type exec not supported on this platform!");
 384         return;
 385 #endif
 386 }
 387
 388 static bool is_valid_host_port(const char *host, const char *port) {
 389         for(const char *p = host; *p; p++)
 390                 if(!isalnum(*p) && *p != '-' && *p != '.') {
 391                         return false;
 392                 }
 393
 394         for(const char *p = port; *p; p++)
 395                 if(!isalnum(*p)) {
 396                         return false;
 397                 }
 398
 399         return true;
 400 }
 401
 402 void do_outgoing_connection(connection_t *c) {
 403         struct addrinfo *proxyai = NULL;
 404         int result;
 405
 406         if(!c->outgoing) {
 407                 logger(LOG_ERR, "do_outgoing_connection() for %s called without c->outgoing", c->name);
 408                 abort();
 409         }
 410
 411 begin:
 412
 413         if(!c->outgoing->ai) {
 414                 if(!c->outgoing->cfg) {
 415                         ifdebug(CONNECTIONS) logger(LOG_ERR, "Could not set up a meta connection to %s",
 416                                                     c->name);
 417                         c->status.remove = true;
 418                         retry_outgoing(c->outgoing);
 419                         c->outgoing = NULL;
 420                         return;
 421                 }
 422
 423                 char *address, *port, *space;
 424
 425                 get_config_string(c->outgoing->cfg, &address);
 426
 427                 space = strchr(address, ' ');
 428
 429                 if(space) {
 430                         port = xstrdup(space + 1);
 431                         *space = 0;
 432                 } else {
 433                         if(!get_config_string(lookup_config(c->config_tree, "Port"), &port)) {
 434                                 port = xstrdup("655");
 435                         }
 436                 }
 437
 438                 c->outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
 439
 440                 // If we cannot resolve the address, maybe we are using a proxy that can?
 441                 if(!c->outgoing->ai && proxytype != PROXY_NONE && is_valid_host_port(address, port)) {
 442                         memset(&c->address, 0, sizeof(c->address));
 443                         c->address.sa.sa_family = AF_UNKNOWN;
 444                         c->address.unknown.address = address;
 445                         c->address.unknown.port = port;
 446                 } else {
 447                         free(address);
 448                         free(port);
 449                 }
 450
 451                 c->outgoing->aip = c->outgoing->ai;
 452                 c->outgoing->cfg = lookup_config_next(c->config_tree, c->outgoing->cfg);
 453
 454                 if(!c->outgoing->ai && proxytype != PROXY_NONE) {
 455                         goto connect;
 456                 }
 457         }
 458
 459         if(!c->outgoing->aip) {
 460                 if(c->outgoing->ai) {
 461                         freeaddrinfo(c->outgoing->ai);
 462                 }
 463
 464                 c->outgoing->ai = NULL;
 465                 goto begin;
 466         }
 467
 468         memcpy(&c->address, c->outgoing->aip->ai_addr, c->outgoing->aip->ai_addrlen);
 469         c->outgoing->aip = c->outgoing->aip->ai_next;
 470
 471 connect:
 472
 473         if(c->hostname) {
 474                 free(c->hostname);
 475         }
 476
 477         c->hostname = sockaddr2hostname(&c->address);
 478
 479         ifdebug(CONNECTIONS) logger(LOG_INFO, "Trying to connect to %s (%s)", c->name,
 480                                     c->hostname);
 481
 482         if(!proxytype) {
 483                 c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
 484         } else if(proxytype == PROXY_EXEC) {
 485                 c->status.proxy_passed = true;
 486                 do_outgoing_pipe(c, proxyhost);
 487         } else {
 488                 proxyai = str2addrinfo(proxyhost, proxyport, SOCK_STREAM);
 489
 490                 if(!proxyai) {
 491                         goto begin;
 492                 }
 493
 494                 ifdebug(CONNECTIONS) logger(LOG_INFO, "Using proxy at %s port %s", proxyhost, proxyport);
 495                 c->socket = socket(proxyai->ai_family, SOCK_STREAM, IPPROTO_TCP);
 496         }
 497
 498         if(c->socket == -1) {
 499                 ifdebug(CONNECTIONS) logger(LOG_ERR, "Creating socket for %s failed: %s", c->hostname, sockstrerror(sockerrno));
 500                 goto begin;
 501         }
 502
 503         if(proxytype != PROXY_EXEC) {
 504                 configure_tcp(c);
 505         }
 506
 507 #ifdef FD_CLOEXEC
 508         fcntl(c->socket, F_SETFD, FD_CLOEXEC);
 509 #endif
 510
 511         if(proxytype != PROXY_EXEC) {
 512 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
 513                 int option = 1;
 514
 515                 if(c->address.sa.sa_family == AF_INET6) {
 516                         setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof(option));
 517                 }
 518
 519 #endif
 520
 521                 bind_to_interface(c->socket);
 522
 523                 int b = -1;
 524
 525                 for(int i = 0; i < listen_sockets; i++) {
 526                         if(listen_socket[i].sa.sa.sa_family == c->address.sa.sa_family) {
 527                                 if(b == -1) {
 528                                         b = i;
 529                                 } else  {
 530                                         b = -1;
 531                                         break;
 532                                 }
 533                         }
 534                 }
 535
 536                 if(b != -1) {
 537                         sockaddr_t sa = listen_socket[b].sa;
 538
 539                         if(sa.sa.sa_family == AF_INET) {
 540                                 sa.in.sin_port = 0;
 541                         } else if(sa.sa.sa_family == AF_INET6) {
 542                                 sa.in6.sin6_port = 0;
 543                         }
 544
 545                         if(bind(c->socket, &sa.sa, SALEN(sa.sa))) {
 546                                 char *addrstr = sockaddr2hostname(&sa);
 547                                 logger(LOG_ERR, "Can't bind to %s/tcp: %s", addrstr, sockstrerror(sockerrno));
 548                                 free(addrstr);
 549                         }
 550                 }
 551         }
 552
 553         /* Connect */
 554
 555         if(!proxytype) {
 556                 result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
 557         } else if(proxytype == PROXY_EXEC) {
 558                 result = 0;
 559         } else {
 560                 result = connect(c->socket, proxyai->ai_addr, proxyai->ai_addrlen);
 561                 freeaddrinfo(proxyai);
 562         }
 563
 564         now = time(NULL);
 565
 566         if(result == -1) {
 567                 if(sockinprogress(sockerrno)) {
 568                         c->last_ping_time = now;
 569                         c->status.connecting = true;
 570                         return;
 571                 }
 572
 573                 closesocket(c->socket);
 574
 575                 ifdebug(CONNECTIONS) logger(LOG_ERR, "%s: %s", c->hostname, sockstrerror(sockerrno));
 576
 577                 goto begin;
 578         }
 579
 580         finish_connecting(c);
 581
 582         return;
 583 }
 584
 585 void setup_outgoing_connection(outgoing_t *outgoing) {
 586         connection_t *c;
 587         node_t *n;
 588
 589         outgoing->event = NULL;
 590
 591         n = lookup_node(outgoing->name);
 592
 593         if(n)
 594                 if(n->connection) {
 595                         ifdebug(CONNECTIONS) logger(LOG_INFO, "Already connected to %s", outgoing->name);
 596
 597                         n->connection->outgoing = outgoing;
 598                         return;
 599                 }
 600
 601         c = new_connection();
 602         c->name = xstrdup(outgoing->name);
 603         c->outcipher = myself->connection->outcipher;
 604         c->outdigest = myself->connection->outdigest;
 605         c->outmaclength = myself->connection->outmaclength;
 606         c->outcompression = myself->connection->outcompression;
 607
 608         init_configuration(&c->config_tree);
 609
 610         if(!read_connection_config(c)) {
 611                 free_connection(c);
 612                 outgoing->timeout = maxtimeout;
 613                 retry_outgoing(outgoing);
 614                 return;
 615         }
 616
 617         outgoing->cfg = lookup_config(c->config_tree, "Address");
 618
 619         if(!outgoing->cfg) {
 620                 logger(LOG_ERR, "No address specified for %s", c->name);
 621                 free_connection(c);
 622                 outgoing->timeout = maxtimeout;
 623                 retry_outgoing(outgoing);
 624                 return;
 625         }
 626
 627         c->outgoing = outgoing;
 628         c->last_ping_time = now;
 629
 630         connection_add(c);
 631
 632         do_outgoing_connection(c);
 633 }
 634
 635 /*
 636   accept a new tcp connect and create a
 637   new connection
 638 */
 639 bool handle_new_meta_connection(int sock) {
 640         connection_t *c;
 641         sockaddr_t sa;
 642         int fd;
 643         socklen_t len = sizeof(sa);
 644
 645         fd = accept(sock, &sa.sa, &len);
 646
 647         if(fd < 0) {
 648                 logger(LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
 649                 return false;
 650         }
 651
 652         sockaddrunmap(&sa);
 653
 654         c = new_connection();
 655         c->name = xstrdup("<unknown>");
 656         c->outcipher = myself->connection->outcipher;
 657         c->outdigest = myself->connection->outdigest;
 658         c->outmaclength = myself->connection->outmaclength;
 659         c->outcompression = myself->connection->outcompression;
 660
 661         c->address = sa;
 662         c->hostname = sockaddr2hostname(&sa);
 663         c->socket = fd;
 664         c->last_ping_time = now;
 665
 666         ifdebug(CONNECTIONS) logger(LOG_NOTICE, "Connection from %s", c->hostname);
 667
 668         configure_tcp(c);
 669
 670         connection_add(c);
 671
 672         c->allow_request = ID;
 673         send_id(c);
 674
 675         return true;
 676 }
 677
 678 static void free_outgoing(outgoing_t *outgoing) {
 679         if(outgoing->ai) {
 680                 freeaddrinfo(outgoing->ai);
 681         }
 682
 683         if(outgoing->name) {
 684                 free(outgoing->name);
 685         }
 686
 687         free(outgoing);
 688 }
 689
 690 void try_outgoing_connections(void) {
 691         static config_t *cfg = NULL;
 692         char *name;
 693         outgoing_t *outgoing;
 694
 695         outgoing_list = list_alloc((list_action_t)free_outgoing);
 696
 697         for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
 698                 get_config_string(cfg, &name);
 699
 700                 if(!check_id(name)) {
 701                         logger(LOG_ERR,
 702                                "Invalid name for outgoing connection in %s line %d",
 703                                cfg->file, cfg->line);
 704                         free(name);
 705                         continue;
 706                 }
 707
 708                 outgoing = xmalloc_and_zero(sizeof(*outgoing));
 709                 outgoing->name = name;
 710                 list_insert_tail(outgoing_list, outgoing);
 711                 setup_outgoing_connection(outgoing);
 712         }
 713 }