git.meshlink.io Git - meshlink/blob - src/net_socket.c

   1 /*
   2     net_socket.c -- Handle various kinds of sockets.
   3     Copyright (C) 2014-2017 Guus Sliepen <guus@meshlink.io>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License along
  16     with this program; if not, write to the Free Software Foundation, Inc.,
  17     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "system.h"
  21
  22 #include "conf.h"
  23 #include "connection.h"
  24 #include "list.h"
  25 #include "logger.h"
  26 #include "meshlink_internal.h"
  27 #include "meta.h"
  28 #include "net.h"
  29 #include "netutl.h"
  30 #include "protocol.h"
  31 #include "utils.h"
  32 #include "xalloc.h"
  33
  34 /* Needed on Mac OS/X */
  35 #ifndef SOL_TCP
  36 #define SOL_TCP IPPROTO_TCP
  37 #endif
  38
  39 #ifndef MSG_NOSIGNAL
  40 #define MSG_NOSIGNAL 0
  41 #endif
  42
  43 static const int max_connection_burst = 100;
  44
  45 /* Setup sockets */
  46
  47 static void configure_tcp(connection_t *c) {
  48 #ifdef O_NONBLOCK
  49         int flags = fcntl(c->socket, F_GETFL);
  50
  51         if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) {
  52                 logger(c->mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "fcntl", strerror(errno));
  53         }
  54
  55 #elif defined(WIN32)
  56         unsigned long arg = 1;
  57
  58         if(ioctlsocket(c->socket, FIONBIO, &arg) != 0) {
  59                 logger(c->mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "ioctlsocket", sockstrerror(sockerrno));
  60         }
  61
  62 #endif
  63
  64 #if defined(SOL_TCP) && defined(TCP_NODELAY)
  65         int nodelay = 1;
  66         setsockopt(c->socket, SOL_TCP, TCP_NODELAY, (void *)&nodelay, sizeof(nodelay));
  67 #endif
  68
  69 #if defined(IP_TOS) && defined(IPTOS_LOWDELAY)
  70         int lowdelay = IPTOS_LOWDELAY;
  71         setsockopt(c->socket, IPPROTO_IP, IP_TOS, (void *)&lowdelay, sizeof(lowdelay));
  72 #endif
  73 }
  74
  75 bool setup_listen_socket(meshlink_handle_t *mesh, int nfd, int sa_family) {
  76 #ifdef FD_CLOEXEC
  77         fcntl(nfd, F_SETFD, FD_CLOEXEC);
  78 #endif
  79
  80         int option = 1;
  81         setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof(option));
  82
  83 #if defined(IPV6_V6ONLY)
  84
  85         if(sa_family == AF_INET6) {
  86                 setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof(option));
  87         }
  88
  89 #else
  90 #warning IPV6_V6ONLY not defined
  91 #endif
  92
  93         if(listen(nfd, 3)) {
  94                 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "listen", sockstrerror(sockerrno));
  95                 return false;
  96         }
  97
  98         return true;
  99 }
 100
 101 bool setup_vpn_in_socket(meshlink_handle_t *mesh, int nfd, int sa_family) {
 102 #ifdef FD_CLOEXEC
 103         fcntl(nfd, F_SETFD, FD_CLOEXEC);
 104 #endif
 105
 106 #ifdef O_NONBLOCK
 107         {
 108                 int flags = fcntl(nfd, F_GETFL);
 109
 110                 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
 111                         closesocket(nfd);
 112                         logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "fcntl",
 113                                strerror(errno));
 114                         return false;
 115                 }
 116         }
 117 #elif defined(WIN32)
 118         {
 119                 unsigned long arg = 1;
 120
 121                 if(ioctlsocket(nfd, FIONBIO, &arg) != 0) {
 122                         closesocket(nfd);
 123                         logger(mesh, MESHLINK_ERROR, "Call to `%s' failed: %s", "ioctlsocket", sockstrerror(sockerrno));
 124                         return false;
 125                 }
 126         }
 127 #endif
 128
 129         int option = 1;
 130         setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof(option));
 131         setsockopt(nfd, SOL_SOCKET, SO_BROADCAST, (void *)&option, sizeof(option));
 132
 133 #if defined(IPV6_V6ONLY)
 134
 135         if(sa_family == AF_INET6) {
 136                 setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof(option));
 137         }
 138
 139 #endif
 140
 141 #if defined(IP_DONTFRAG) && !defined(IP_DONTFRAGMENT)
 142 #define IP_DONTFRAGMENT IP_DONTFRAG
 143 #endif
 144
 145 #if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
 146         option = IP_PMTUDISC_DO;
 147         setsockopt(nfd, IPPROTO_IP, IP_MTU_DISCOVER, (void *)&option, sizeof(option));
 148 #elif defined(IP_DONTFRAGMENT)
 149         option = 1;
 150         setsockopt(nfd, IPPROTO_IP, IP_DONTFRAGMENT, (void *)&option, sizeof(option));
 151 #endif
 152
 153 #if defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
 154         option = IPV6_PMTUDISC_DO;
 155         setsockopt(nfd, IPPROTO_IPV6, IPV6_MTU_DISCOVER, (void *)&option, sizeof(option));
 156 #elif defined(IPV6_DONTFRAG)
 157         option = 1;
 158         setsockopt(nfd, IPPROTO_IPV6, IPV6_DONTFRAG, (void *)&option, sizeof(option));
 159 #endif
 160
 161         return true;
 162 } /* int setup_vpn_in_socket */
 163
 164 static void retry_outgoing_handler(event_loop_t *loop, void *data) {
 165         assert(data);
 166
 167         meshlink_handle_t *mesh = loop->data;
 168         outgoing_t *outgoing = data;
 169         setup_outgoing_connection(mesh, outgoing);
 170 }
 171
 172 void retry_outgoing(meshlink_handle_t *mesh, outgoing_t *outgoing) {
 173         if(!mesh->reachable && mesh->loop.now.tv_sec < mesh->last_unreachable + mesh->dev_class_traits[mesh->devclass].fast_retry_period) {
 174                 outgoing->timeout = 1;
 175         } else {
 176                 outgoing->timeout += 5;
 177         }
 178
 179         if(outgoing->timeout > mesh->maxtimeout) {
 180                 outgoing->timeout = mesh->maxtimeout;
 181         }
 182
 183         timeout_add(&mesh->loop, &outgoing->ev, retry_outgoing_handler, outgoing, &(struct timeval) {
 184                 outgoing->timeout, prng(mesh, TIMER_FUDGE)
 185         });
 186
 187         logger(mesh, MESHLINK_INFO, "Trying to re-establish outgoing connection in %d seconds", outgoing->timeout);
 188 }
 189
 190 void finish_connecting(meshlink_handle_t *mesh, connection_t *c) {
 191         logger(mesh, MESHLINK_INFO, "Connected to %s", c->name);
 192
 193         c->last_ping_time = mesh->loop.now.tv_sec;
 194         c->status.connecting = false;
 195
 196         send_id(mesh, c);
 197 }
 198
 199 static void handle_meta_write(meshlink_handle_t *mesh, connection_t *c) {
 200         if(c->outbuf.len <= c->outbuf.offset) {
 201                 return;
 202         }
 203
 204         ssize_t outlen = send(c->socket, c->outbuf.data + c->outbuf.offset, c->outbuf.len - c->outbuf.offset, MSG_NOSIGNAL);
 205
 206         if(outlen <= 0) {
 207                 if(!errno || errno == EPIPE) {
 208                         logger(mesh, MESHLINK_INFO, "Connection closed by %s", c->name);
 209                 } else if(sockwouldblock(sockerrno)) {
 210                         logger(mesh, MESHLINK_DEBUG, "Sending %lu bytes to %s would block", (unsigned long)(c->outbuf.len - c->outbuf.offset), c->name);
 211                         return;
 212                 } else {
 213                         logger(mesh, MESHLINK_ERROR, "Could not send %lu bytes of data to %s: %s", (unsigned long)(c->outbuf.len - c->outbuf.offset), c->name, strerror(errno));
 214                 }
 215
 216                 terminate_connection(mesh, c, c->status.active);
 217                 return;
 218         }
 219
 220         buffer_read(&c->outbuf, outlen);
 221
 222         if(!c->outbuf.len) {
 223                 io_set(&mesh->loop, &c->io, IO_READ);
 224         }
 225 }
 226
 227 static void handle_meta_io(event_loop_t *loop, void *data, int flags) {
 228         meshlink_handle_t *mesh = loop->data;
 229         connection_t *c = data;
 230
 231         if(c->status.connecting) {
 232                 c->status.connecting = false;
 233
 234                 int result;
 235                 socklen_t len = sizeof(result);
 236                 getsockopt(c->socket, SOL_SOCKET, SO_ERROR, (void *)&result, &len);
 237
 238                 if(!result) {
 239                         finish_connecting(mesh, c);
 240                 } else {
 241                         logger(mesh, MESHLINK_DEBUG, "Error while connecting to %s: %s", c->name, sockstrerror(result));
 242                         terminate_connection(mesh, c, false);
 243                         return;
 244                 }
 245         }
 246
 247         if(flags & IO_WRITE) {
 248                 handle_meta_write(mesh, c);
 249         } else {
 250                 handle_meta_connection_data(mesh, c);
 251         }
 252 }
 253
 254 // Find edges pointing to this node, and use them to build a list of unique, known addresses.
 255 static struct addrinfo *get_known_addresses(node_t *n) {
 256         struct addrinfo *ai = NULL;
 257
 258         for splay_each(edge_t, e, n->edge_tree) {
 259                 if(!e->reverse) {
 260                         continue;
 261                 }
 262
 263                 bool found = false;
 264
 265                 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 266                         if(!sockaddrcmp(&e->reverse->address, (sockaddr_t *)aip->ai_addr)) {
 267                                 found = true;
 268                                 break;
 269                         }
 270                 }
 271
 272                 if(found) {
 273                         continue;
 274                 }
 275
 276                 // Create a new struct addrinfo, and put it at the head of the list.
 277                 struct addrinfo *nai = xzalloc(sizeof(*nai) + SALEN(e->reverse->address.sa));
 278                 nai->ai_next = ai;
 279                 ai = nai;
 280
 281                 ai->ai_family = e->reverse->address.sa.sa_family;
 282                 ai->ai_socktype = SOCK_STREAM;
 283                 ai->ai_protocol = IPPROTO_TCP;
 284                 ai->ai_addrlen = SALEN(e->reverse->address.sa);
 285                 ai->ai_addr = (struct sockaddr *)(nai + 1);
 286                 memcpy(ai->ai_addr, &e->reverse->address, ai->ai_addrlen);
 287         }
 288
 289         return ai;
 290 }
 291
 292 // Build a list of recently seen addresses.
 293 static struct addrinfo *get_recent_addresses(node_t *n) {
 294         struct addrinfo *ai = NULL;
 295         struct addrinfo *aip;
 296
 297         for(int i = 0; i < 5; i++) {
 298                 if(!n->recent[i].sa.sa_family) {
 299                         break;
 300                 }
 301
 302                 // Create a new struct addrinfo, and put it at the end of the list.
 303                 struct addrinfo *nai = xzalloc(sizeof(*nai) + SALEN(n->recent[i].sa));
 304
 305                 if(!ai) {
 306                         ai = nai;
 307                 } else {
 308                         aip->ai_next = nai;
 309                 }
 310
 311                 aip = nai;
 312
 313                 nai->ai_family = n->recent[i].sa.sa_family;
 314                 nai->ai_socktype = SOCK_STREAM;
 315                 nai->ai_protocol = IPPROTO_TCP;
 316                 nai->ai_addrlen = SALEN(n->recent[i].sa);
 317                 nai->ai_addr = (struct sockaddr *)(nai + 1);
 318                 memcpy(nai->ai_addr, &n->recent[i], nai->ai_addrlen);
 319         }
 320
 321         return ai;
 322 }
 323
 324 // Free struct addrinfo list from get_known_addresses().
 325 static void free_known_addresses(struct addrinfo *ai) {
 326         for(struct addrinfo *aip = ai, *next; aip; aip = next) {
 327                 next = aip->ai_next;
 328                 free(aip);
 329         }
 330 }
 331
 332 static struct addrinfo *get_canonical_address(node_t *n) {
 333         if(!n->canonical_address) {
 334                 return false;
 335         }
 336
 337         char *address = xstrdup(n->canonical_address);
 338         char *port = strchr(address, ' ');
 339
 340         if(!port) {
 341                 free(address);
 342                 return false;
 343         }
 344
 345         *port++ = 0;
 346
 347         struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
 348         free(address);
 349
 350         return ai;
 351 }
 352
 353 static bool get_next_outgoing_address(meshlink_handle_t *mesh, outgoing_t *outgoing) {
 354         (void)mesh;
 355
 356         bool start = false;
 357
 358         if(outgoing->state == OUTGOING_START) {
 359                 start = true;
 360                 outgoing->state = OUTGOING_CANONICAL;
 361         }
 362
 363         if(outgoing->state == OUTGOING_CANONICAL) {
 364                 if(!outgoing->aip) {
 365                         outgoing->ai = get_canonical_address(outgoing->node);
 366                         outgoing->aip = outgoing->ai;
 367                 } else {
 368                         outgoing->aip = outgoing->aip->ai_next;
 369                 }
 370
 371                 if(outgoing->aip) {
 372                         return true;
 373                 }
 374
 375                 freeaddrinfo(outgoing->ai);
 376                 outgoing->ai = NULL;
 377                 outgoing->aip = NULL;
 378                 outgoing->state = OUTGOING_RECENT;
 379         }
 380
 381         if(outgoing->state == OUTGOING_RECENT) {
 382                 if(!outgoing->aip) {
 383                         outgoing->ai = get_recent_addresses(outgoing->node);
 384                         outgoing->aip = outgoing->ai;
 385                 } else {
 386                         outgoing->aip = outgoing->aip->ai_next;
 387                 }
 388
 389                 if(outgoing->aip) {
 390                         return true;
 391                 }
 392
 393                 free_known_addresses(outgoing->ai);
 394                 outgoing->ai = NULL;
 395                 outgoing->aip = NULL;
 396                 outgoing->state = OUTGOING_KNOWN;
 397         }
 398
 399         if(outgoing->state == OUTGOING_KNOWN) {
 400                 if(!outgoing->aip) {
 401                         outgoing->ai = get_known_addresses(outgoing->node);
 402                         outgoing->aip = outgoing->ai;
 403                 } else {
 404                         outgoing->aip = outgoing->aip->ai_next;
 405                 }
 406
 407                 if(outgoing->aip) {
 408                         return true;
 409                 }
 410
 411                 free_known_addresses(outgoing->ai);
 412                 outgoing->ai = NULL;
 413                 outgoing->aip = NULL;
 414                 outgoing->state = OUTGOING_END;
 415         }
 416
 417         if(start) {
 418                 outgoing->state = OUTGOING_NO_KNOWN_ADDRESSES;
 419         }
 420
 421         return false;
 422 }
 423
 424 void do_outgoing_connection(meshlink_handle_t *mesh, outgoing_t *outgoing) {
 425         struct addrinfo *proxyai = NULL;
 426         int result;
 427
 428 begin:
 429
 430         if(!get_next_outgoing_address(mesh, outgoing)) {
 431                 if(outgoing->state == OUTGOING_NO_KNOWN_ADDRESSES) {
 432                         logger(mesh, MESHLINK_ERROR, "No known addresses for %s", outgoing->node->name);
 433                 } else {
 434                         logger(mesh, MESHLINK_ERROR, "Could not set up a meta connection to %s", outgoing->node->name);
 435                         retry_outgoing(mesh, outgoing);
 436                 }
 437
 438                 return;
 439         }
 440
 441         connection_t *c = new_connection();
 442         c->outgoing = outgoing;
 443
 444         memcpy(&c->address, outgoing->aip->ai_addr, outgoing->aip->ai_addrlen);
 445
 446         char *hostname = sockaddr2hostname(&c->address);
 447
 448         logger(mesh, MESHLINK_INFO, "Trying to connect to %s at %s", outgoing->node->name, hostname);
 449
 450         if(!mesh->proxytype) {
 451                 c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
 452                 configure_tcp(c);
 453         } else {
 454                 proxyai = str2addrinfo(mesh->proxyhost, mesh->proxyport, SOCK_STREAM);
 455
 456                 if(!proxyai) {
 457                         free_connection(c);
 458                         free(hostname);
 459                         goto begin;
 460                 }
 461
 462                 logger(mesh, MESHLINK_INFO, "Using proxy at %s port %s", mesh->proxyhost, mesh->proxyport);
 463                 c->socket = socket(proxyai->ai_family, SOCK_STREAM, IPPROTO_TCP);
 464                 configure_tcp(c);
 465         }
 466
 467         if(c->socket == -1) {
 468                 logger(mesh, MESHLINK_ERROR, "Creating socket for %s at %s failed: %s", c->name, hostname, sockstrerror(sockerrno));
 469                 free_connection(c);
 470                 free(hostname);
 471                 goto begin;
 472         }
 473
 474         free(hostname);
 475
 476 #ifdef FD_CLOEXEC
 477         fcntl(c->socket, F_SETFD, FD_CLOEXEC);
 478 #endif
 479
 480 #if defined(IPV6_V6ONLY)
 481
 482         if(c->address.sa.sa_family == AF_INET6) {
 483                 static const int option = 1;
 484                 setsockopt(c->socket, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof(option));
 485         }
 486
 487 #endif
 488
 489         /* Connect */
 490
 491         if(!mesh->proxytype) {
 492                 result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
 493         } else {
 494                 result = connect(c->socket, proxyai->ai_addr, proxyai->ai_addrlen);
 495                 freeaddrinfo(proxyai);
 496         }
 497
 498         if(result == -1 && !sockinprogress(sockerrno)) {
 499                 logger(mesh, MESHLINK_ERROR, "Could not connect to %s: %s", outgoing->node->name, sockstrerror(sockerrno));
 500                 free_connection(c);
 501
 502                 goto begin;
 503         }
 504
 505         /* Now that there is a working socket, fill in the rest and register this connection. */
 506
 507         c->status.connecting = true;
 508         c->status.initiator = true;
 509         c->name = xstrdup(outgoing->node->name);
 510         c->last_ping_time = mesh->loop.now.tv_sec;
 511
 512         connection_add(mesh, c);
 513
 514         io_add(&mesh->loop, &c->io, handle_meta_io, c, c->socket, IO_READ | IO_WRITE);
 515 }
 516
 517 void reset_outgoing(outgoing_t *outgoing) {
 518         if(outgoing->ai) {
 519                 if(outgoing->state == OUTGOING_RECENT || outgoing->state == OUTGOING_KNOWN) {
 520                         free_known_addresses(outgoing->ai);
 521                 } else {
 522                         freeaddrinfo(outgoing->ai);
 523                 }
 524         }
 525
 526         outgoing->ai = NULL;
 527         outgoing->aip = NULL;
 528         outgoing->state = OUTGOING_START;
 529 }
 530
 531 void setup_outgoing_connection(meshlink_handle_t *mesh, outgoing_t *outgoing) {
 532         timeout_del(&mesh->loop, &outgoing->ev);
 533
 534         if(outgoing->node->connection) {
 535                 logger(mesh, MESHLINK_INFO, "Already connected to %s", outgoing->node->name);
 536
 537                 outgoing->node->connection->outgoing = outgoing;
 538                 return;
 539         }
 540
 541         reset_outgoing(outgoing);
 542
 543         if(outgoing->node->status.blacklisted) {
 544                 return;
 545         }
 546
 547         if(mesh->connection_try_cb) {
 548                 mesh->connection_try_cb(mesh, (meshlink_node_t *)outgoing->node);
 549         }
 550
 551         do_outgoing_connection(mesh, outgoing);
 552 }
 553
 554 /// Delayed close of a filedescriptor.
 555 static void tarpit(meshlink_handle_t *mesh, int fd) {
 556         if(!fd) {
 557                 return;
 558         }
 559
 560         if(mesh->pits[mesh->next_pit]) {
 561                 closesocket(mesh->pits[mesh->next_pit]);
 562         }
 563
 564         mesh->pits[mesh->next_pit++] = fd;
 565
 566         if(mesh->next_pit >= (int)(sizeof mesh->pits / sizeof mesh->pits[0])) {
 567                 mesh->next_pit = 0;
 568         }
 569 }
 570
 571 /*
 572   accept a new tcp connect and create a
 573   new connection
 574 */
 575 void handle_new_meta_connection(event_loop_t *loop, void *data, int flags) {
 576         (void)flags;
 577         meshlink_handle_t *mesh = loop->data;
 578         listen_socket_t *l = data;
 579         connection_t *c;
 580         sockaddr_t sa;
 581         int fd;
 582         socklen_t len = sizeof(sa);
 583
 584         memset(&sa, 0, sizeof(sa));
 585
 586         fd = accept(l->tcp.fd, &sa.sa, &len);
 587
 588         if(fd < 0) {
 589                 if(errno == EINVAL) { // TODO: check if Windows agrees
 590                         event_loop_stop(loop);
 591                         return;
 592                 }
 593
 594                 logger(mesh, MESHLINK_ERROR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
 595                 return;
 596         }
 597
 598         sockaddrunmap(&sa);
 599
 600         /* Rate limit incoming connections to max_connection_burst/second. */
 601
 602         if(mesh->loop.now.tv_sec != mesh->connection_burst_time) {
 603                 mesh->connection_burst_time = mesh->loop.now.tv_sec;
 604                 mesh->connection_burst = 0;
 605         }
 606
 607         if(mesh->connection_burst >= max_connection_burst) {
 608                 tarpit(mesh, fd);
 609                 return;
 610         }
 611
 612         mesh->connection_burst++;
 613
 614         // Accept the new connection
 615
 616         c = new_connection();
 617         c->name = xstrdup("<unknown>");
 618
 619         c->address = sa;
 620         c->socket = fd;
 621         c->last_ping_time = mesh->loop.now.tv_sec;
 622
 623         char *hostname = sockaddr2hostname(&sa);
 624         logger(mesh, MESHLINK_INFO, "Connection from %s", hostname);
 625         free(hostname);
 626
 627         io_add(&mesh->loop, &c->io, handle_meta_io, c, c->socket, IO_READ);
 628
 629         configure_tcp(c);
 630
 631         connection_add(mesh, c);
 632
 633         c->allow_request = ID;
 634         send_id(mesh, c);
 635 }
 636
 637 static void free_outgoing(outgoing_t *outgoing) {
 638         meshlink_handle_t *mesh = outgoing->node->mesh;
 639
 640         timeout_del(&mesh->loop, &outgoing->ev);
 641
 642         if(outgoing->ai) {
 643                 if(outgoing->state == OUTGOING_RECENT || outgoing->state == OUTGOING_KNOWN) {
 644                         free_known_addresses(outgoing->ai);
 645                 } else {
 646                         freeaddrinfo(outgoing->ai);
 647                 }
 648         }
 649
 650         free(outgoing);
 651 }
 652
 653 void init_outgoings(meshlink_handle_t *mesh) {
 654         mesh->outgoings = list_alloc((list_action_t)free_outgoing);
 655 }
 656
 657 void exit_outgoings(meshlink_handle_t *mesh) {
 658         if(mesh->outgoings) {
 659                 list_delete_list(mesh->outgoings);
 660                 mesh->outgoings = NULL;
 661         }
 662 }