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

   1 /*
   2     net_socket.c -- Handle various kinds of sockets.
   3     Copyright (C) 2014 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 int addressfamily = AF_UNSPEC;
  40 int seconds_till_retry = 5;
  41 int max_connection_burst = 100;
  42
  43 /* Setup sockets */
  44
  45 static void configure_tcp(connection_t *c) {
  46         int option;
  47
  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(DEBUG_ALWAYS, LOG_ERR, "fcntl for %s: %s", c->hostname, strerror(errno));
  53         }
  54 #elif defined(WIN32)
  55         unsigned long arg = 1;
  56
  57         if(ioctlsocket(c->socket, FIONBIO, &arg) != 0) {
  58                 logger(DEBUG_ALWAYS, LOG_ERR, "ioctlsocket for %s: %s", c->hostname, sockstrerror(sockerrno));
  59         }
  60 #endif
  61
  62 #if defined(SOL_TCP) && defined(TCP_NODELAY)
  63         option = 1;
  64         setsockopt(c->socket, SOL_TCP, TCP_NODELAY, (void *)&option, sizeof option);
  65 #endif
  66
  67 #if defined(SOL_IP) && defined(IP_TOS) && defined(IPTOS_LOWDELAY)
  68         option = IPTOS_LOWDELAY;
  69         setsockopt(c->socket, SOL_IP, IP_TOS, (void *)&option, sizeof option);
  70 #endif
  71 }
  72
  73 static bool bind_to_address(connection_t *c) {
  74         int s = -1;
  75
  76         for(int i = 0; i < mesh->listen_sockets && mesh->listen_socket[i].bindto; i++) {
  77                 if(mesh->listen_socket[i].sa.sa.sa_family != c->address.sa.sa_family)
  78                         continue;
  79                 if(s >= 0)
  80                         return false;
  81                 s = i;
  82         }
  83
  84         if(s < 0)
  85                 return false;
  86
  87         sockaddr_t sa = mesh->listen_socket[s].sa;
  88         if(sa.sa.sa_family == AF_INET)
  89                 sa.in.sin_port = 0;
  90         else if(sa.sa.sa_family == AF_INET6)
  91                 sa.in6.sin6_port = 0;
  92
  93         if(bind(c->socket, &sa.sa, SALEN(sa.sa))) {
  94                 logger(DEBUG_CONNECTIONS, LOG_WARNING, "Can't bind outgoing socket: %s", strerror(errno));
  95                 return false;
  96         }
  97
  98         return true;
  99 }
 100
 101 int setup_listen_socket(const sockaddr_t *sa) {
 102         int nfd;
 103         char *addrstr;
 104         int option;
 105         char *iface;
 106
 107         nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
 108
 109         if(nfd < 0) {
 110                 logger(DEBUG_STATUS, LOG_ERR, "Creating metasocket failed: %s", sockstrerror(sockerrno));
 111                 return -1;
 112         }
 113
 114 #ifdef FD_CLOEXEC
 115         fcntl(nfd, F_SETFD, FD_CLOEXEC);
 116 #endif
 117
 118         /* Optimize TCP settings */
 119
 120         option = 1;
 121         setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof option);
 122
 123 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
 124         if(sa->sa.sa_family == AF_INET6)
 125                 setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
 126 #endif
 127
 128         if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
 129                 closesocket(nfd);
 130                 addrstr = sockaddr2hostname(sa);
 131                 logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to %s/tcp: %s", addrstr, sockstrerror(sockerrno));
 132                 free(addrstr);
 133                 return -1;
 134         }
 135
 136         if(listen(nfd, 3)) {
 137                 closesocket(nfd);
 138                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "listen", sockstrerror(sockerrno));
 139                 return -1;
 140         }
 141
 142         return nfd;
 143 }
 144
 145 int setup_vpn_in_socket(const sockaddr_t *sa) {
 146         int nfd;
 147         char *addrstr;
 148         int option;
 149
 150         nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
 151
 152         if(nfd < 0) {
 153                 logger(DEBUG_ALWAYS, LOG_ERR, "Creating UDP socket failed: %s", sockstrerror(sockerrno));
 154                 return -1;
 155         }
 156
 157 #ifdef FD_CLOEXEC
 158         fcntl(nfd, F_SETFD, FD_CLOEXEC);
 159 #endif
 160
 161 #ifdef O_NONBLOCK
 162         {
 163                 int flags = fcntl(nfd, F_GETFL);
 164
 165                 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
 166                         closesocket(nfd);
 167                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "fcntl",
 168                                    strerror(errno));
 169                         return -1;
 170                 }
 171         }
 172 #elif defined(WIN32)
 173         {
 174                 unsigned long arg = 1;
 175                 if(ioctlsocket(nfd, FIONBIO, &arg) != 0) {
 176                         closesocket(nfd);
 177                         logger(DEBUG_ALWAYS, LOG_ERR, "Call to `%s' failed: %s", "ioctlsocket", sockstrerror(sockerrno));
 178                         return -1;
 179                 }
 180         }
 181 #endif
 182
 183         option = 1;
 184         setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof option);
 185         setsockopt(nfd, SOL_SOCKET, SO_BROADCAST, (void *)&option, sizeof option);
 186
 187 #if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
 188         if(sa->sa.sa_family == AF_INET6)
 189                 setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
 190 #endif
 191
 192 #if defined(IP_DONTFRAG) && !defined(IP_DONTFRAGMENT)
 193 #define IP_DONTFRAGMENT IP_DONTFRAG
 194 #endif
 195
 196 #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
 197         if(mesh->self->options & OPTION_PMTU_DISCOVERY) {
 198                 option = IP_PMTUDISC_DO;
 199                 setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, (void *)&option, sizeof(option));
 200         }
 201 #elif defined(IPPROTO_IP) && defined(IP_DONTFRAGMENT)
 202         if(mesh->self->options & OPTION_PMTU_DISCOVERY) {
 203                 option = 1;
 204                 setsockopt(nfd, IPPROTO_IP, IP_DONTFRAGMENT, (void *)&option, sizeof(option));
 205         }
 206 #else
 207 #warning No way to disable IPv4 fragmentation
 208 #endif
 209
 210 #if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
 211         if(mesh->self->options & OPTION_PMTU_DISCOVERY) {
 212                 option = IPV6_PMTUDISC_DO;
 213                 setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, (void *)&option, sizeof(option));
 214         }
 215 #elif defined(IPPROTO_IPV6) && defined(IPV6_DONTFRAG)
 216         if(mesh->self->options & OPTION_PMTU_DISCOVERY) {
 217                 option = 1;
 218                 setsockopt(nfd, IPPROTO_IPV6, IPV6_DONTFRAG, (void *)&option, sizeof(option));
 219         }
 220 #else
 221 #warning No way to disable IPv6 fragmentation
 222 #endif
 223
 224         if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
 225                 closesocket(nfd);
 226                 addrstr = sockaddr2hostname(sa);
 227                 logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to %s/udp: %s", addrstr, sockstrerror(sockerrno));
 228                 free(addrstr);
 229                 return -1;
 230         }
 231
 232         return nfd;
 233 } /* int setup_vpn_in_socket */
 234
 235 static void retry_outgoing_handler(void *data) {
 236         setup_outgoing_connection(data);
 237 }
 238
 239 void retry_outgoing(outgoing_t *outgoing) {
 240         outgoing->timeout += 5;
 241
 242         if(outgoing->timeout > mesh->maxtimeout)
 243                 outgoing->timeout = mesh->maxtimeout;
 244
 245         timeout_add(&outgoing->ev, retry_outgoing_handler, outgoing, &(struct timeval){outgoing->timeout, rand() % 100000});
 246
 247         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Trying to re-establish outgoing connection in %d seconds", outgoing->timeout);
 248 }
 249
 250 void finish_connecting(connection_t *c) {
 251         logger(DEBUG_CONNECTIONS, LOG_INFO, "Connected to %s (%s)", c->name, c->hostname);
 252
 253         c->last_ping_time = now.tv_sec;
 254         c->status.connecting = false;
 255
 256         send_id(c);
 257 }
 258
 259 static void do_outgoing_pipe(connection_t *c, char *command) {
 260 #ifndef HAVE_MINGW
 261         int fd[2];
 262
 263         if(socketpair(AF_UNIX, SOCK_STREAM, 0, fd)) {
 264                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not create socketpair: %s", strerror(errno));
 265                 return;
 266         }
 267
 268         if(fork()) {
 269                 c->socket = fd[0];
 270                 close(fd[1]);
 271                 logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Using proxy %s", command);
 272                 return;
 273         }
 274
 275         close(0);
 276         close(1);
 277         close(fd[0]);
 278         dup2(fd[1], 0);
 279         dup2(fd[1], 1);
 280         close(fd[1]);
 281
 282         // Other filedescriptors should be closed automatically by CLOEXEC
 283
 284         char *host = NULL;
 285         char *port = NULL;
 286
 287         sockaddr2str(&c->address, &host, &port);
 288         setenv("REMOTEADDRESS", host, true);
 289         setenv("REMOTEPORT", port, true);
 290         setenv("NODE", c->name, true);
 291         setenv("NAME", mesh->self->name, true);
 292
 293         int result = system(command);
 294         if(result < 0)
 295                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not execute %s: %s", command, strerror(errno));
 296         else if(result)
 297                 logger(DEBUG_ALWAYS, LOG_ERR, "%s exited with non-zero status %d", command, result);
 298         exit(result);
 299 #else
 300         logger(DEBUG_ALWAYS, LOG_ERR, "Proxy type exec not supported on this platform!");
 301         return;
 302 #endif
 303 }
 304
 305 static void handle_meta_write(connection_t *c) {
 306         if(c->outbuf.len <= c->outbuf.offset)
 307                 return;
 308
 309         ssize_t outlen = send(c->socket, c->outbuf.data + c->outbuf.offset, c->outbuf.len - c->outbuf.offset, 0);
 310         if(outlen <= 0) {
 311                 if(!errno || errno == EPIPE) {
 312                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection closed by %s (%s)", c->name, c->hostname);
 313                 } else if(sockwouldblock(sockerrno)) {
 314                         logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Sending %d bytes to %s (%s) would block", c->outbuf.len - c->outbuf.offset, c->name, c->hostname);
 315                         return;
 316                 } else {
 317                         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));
 318                 }
 319
 320                 terminate_connection(c, c->status.active);
 321                 return;
 322         }
 323
 324         buffer_read(&c->outbuf, outlen);
 325         if(!c->outbuf.len)
 326                 io_set(&c->io, IO_READ);
 327 }
 328
 329 static void handle_meta_io(void *data, int flags) {
 330         connection_t *c = data;
 331
 332         if(c->status.connecting) {
 333                 c->status.connecting = false;
 334
 335                 int result;
 336                 socklen_t len = sizeof result;
 337                 getsockopt(c->socket, SOL_SOCKET, SO_ERROR, (void *)&result, &len);
 338
 339                 if(!result)
 340                         finish_connecting(c);
 341                 else {
 342                         logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Error while connecting to %s (%s): %s", c->name, c->hostname, sockstrerror(result));
 343                         terminate_connection(c, false);
 344                         return;
 345                 }
 346         }
 347
 348         if(flags & IO_WRITE)
 349                 handle_meta_write(c);
 350         else
 351                 handle_meta_connection_data(c);
 352 }
 353
 354 bool do_outgoing_connection(outgoing_t *outgoing) {
 355         char *address, *port, *space;
 356         struct addrinfo *proxyai = NULL;
 357         int result;
 358
 359 begin:
 360         if(!outgoing->ai) {
 361                 if(!outgoing->cfg) {
 362                         logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not set up a meta connection to %s", outgoing->name);
 363                         retry_outgoing(outgoing);
 364                         return false;
 365                 }
 366
 367                 get_config_string(outgoing->cfg, &address);
 368
 369                 space = strchr(address, ' ');
 370                 if(space) {
 371                         port = xstrdup(space + 1);
 372                         *space = 0;
 373                 } else {
 374                         // TODO: Only allow Address statements?
 375                         if(!get_config_string(lookup_config(outgoing->config_tree, "Port"), &port))
 376                                 port = xstrdup("655");
 377                 }
 378
 379                 outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
 380                 free(address);
 381                 free(port);
 382
 383                 outgoing->aip = outgoing->ai;
 384                 outgoing->cfg = lookup_config_next(outgoing->config_tree, outgoing->cfg);
 385         }
 386
 387         if(!outgoing->aip) {
 388                 if(outgoing->ai)
 389                         freeaddrinfo(outgoing->ai);
 390                 outgoing->ai = NULL;
 391                 goto begin;
 392         }
 393
 394         connection_t *c = new_connection();
 395         c->outgoing = outgoing;
 396
 397         memcpy(&c->address, outgoing->aip->ai_addr, outgoing->aip->ai_addrlen);
 398         outgoing->aip = outgoing->aip->ai_next;
 399
 400         c->hostname = sockaddr2hostname(&c->address);
 401
 402         logger(DEBUG_CONNECTIONS, LOG_INFO, "Trying to connect to %s (%s)", outgoing->name, c->hostname);
 403
 404         if(!mesh->proxytype) {
 405                 c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
 406                 configure_tcp(c);
 407         } else if(mesh->proxytype == PROXY_EXEC) {
 408                 do_outgoing_pipe(c, mesh->proxyhost);
 409         } else {
 410                 proxyai = str2addrinfo(mesh->proxyhost, mesh->proxyport, SOCK_STREAM);
 411                 if(!proxyai) {
 412                         free_connection(c);
 413                         goto begin;
 414                 }
 415                 logger(DEBUG_CONNECTIONS, LOG_INFO, "Using proxy at %s port %s", mesh->proxyhost, mesh->proxyport);
 416                 c->socket = socket(proxyai->ai_family, SOCK_STREAM, IPPROTO_TCP);
 417                 configure_tcp(c);
 418         }
 419
 420         if(c->socket == -1) {
 421                 logger(DEBUG_CONNECTIONS, LOG_ERR, "Creating socket for %s failed: %s", c->hostname, sockstrerror(sockerrno));
 422                 free_connection(c);
 423                 goto begin;
 424         }
 425
 426 #ifdef FD_CLOEXEC
 427         fcntl(c->socket, F_SETFD, FD_CLOEXEC);
 428 #endif
 429
 430         if(mesh->proxytype != PROXY_EXEC) {
 431 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
 432                 int option = 1;
 433                 if(c->address.sa.sa_family == AF_INET6)
 434                         setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
 435 #endif
 436
 437                 bind_to_address(c);
 438         }
 439
 440         /* Connect */
 441
 442         if(!mesh->proxytype) {
 443                 result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
 444         } else if(mesh->proxytype == PROXY_EXEC) {
 445                 result = 0;
 446         } else {
 447                 result = connect(c->socket, proxyai->ai_addr, proxyai->ai_addrlen);
 448                 freeaddrinfo(proxyai);
 449         }
 450
 451         if(result == -1 && !sockinprogress(sockerrno)) {
 452                 logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not connect to %s (%s): %s", outgoing->name, c->hostname, sockstrerror(sockerrno));
 453                 free_connection(c);
 454
 455                 goto begin;
 456         }
 457
 458         /* Now that there is a working socket, fill in the rest and register this connection. */
 459
 460         c->status.connecting = true;
 461         c->name = xstrdup(outgoing->name);
 462         c->outcompression = mesh->self->connection->outcompression;
 463         c->last_ping_time = now.tv_sec;
 464
 465         connection_add(c);
 466
 467         io_add(&c->io, handle_meta_io, c, c->socket, IO_READ|IO_WRITE);
 468
 469         return true;
 470 }
 471
 472 // Find edges pointing to this node, and use them to build a list of unique, known addresses.
 473 static struct addrinfo *get_known_addresses(node_t *n) {
 474         struct addrinfo *ai = NULL;
 475
 476         for splay_each(edge_t, e, n->edge_tree) {
 477                 if(!e->reverse)
 478                         continue;
 479
 480                 bool found = false;
 481                 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
 482                         if(!sockaddrcmp(&e->reverse->address, (sockaddr_t *)aip->ai_addr)) {
 483                                 found = true;
 484                                 break;
 485                         }
 486                 }
 487                 if(found)
 488                         continue;
 489
 490                 struct addrinfo *nai = xzalloc(sizeof *nai);
 491                 if(ai)
 492                         ai->ai_next = nai;
 493                 ai = nai;
 494                 ai->ai_family = e->reverse->address.sa.sa_family;
 495                 ai->ai_socktype = SOCK_STREAM;
 496                 ai->ai_protocol = IPPROTO_TCP;
 497                 ai->ai_addrlen = SALEN(e->reverse->address.sa);
 498                 ai->ai_addr = xmalloc(ai->ai_addrlen);
 499                 memcpy(ai->ai_addr, &e->reverse->address, ai->ai_addrlen);
 500         }
 501
 502         return ai;
 503 }
 504
 505 void setup_outgoing_connection(outgoing_t *outgoing) {
 506         timeout_del(&outgoing->ev);
 507
 508         node_t *n = lookup_node(outgoing->name);
 509
 510         if(n && n->connection) {
 511                 logger(DEBUG_CONNECTIONS, LOG_INFO, "Already connected to %s", outgoing->name);
 512
 513                 n->connection->outgoing = outgoing;
 514                 return;
 515         }
 516
 517         init_configuration(&outgoing->config_tree);
 518         read_host_config(outgoing->config_tree, outgoing->name);
 519         outgoing->cfg = lookup_config(outgoing->config_tree, "Address");
 520
 521         if(!outgoing->cfg) {
 522                 if(n)
 523                         outgoing->aip = outgoing->ai = get_known_addresses(n);
 524                 if(!outgoing->ai) {
 525                         logger(DEBUG_ALWAYS, LOG_ERR, "No address known for %s", outgoing->name);
 526                         return;
 527                 }
 528         }
 529
 530         do_outgoing_connection(outgoing);
 531 }
 532
 533 /*
 534   accept a new tcp connect and create a
 535   new connection
 536 */
 537 void handle_new_meta_connection(void *data, int flags) {
 538         listen_socket_t *l = data;
 539         connection_t *c;
 540         sockaddr_t sa;
 541         int fd;
 542         socklen_t len = sizeof sa;
 543
 544         fd = accept(l->tcp.fd, &sa.sa, &len);
 545
 546         if(fd < 0) {
 547                 logger(DEBUG_ALWAYS, LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
 548                 return;
 549         }
 550
 551         sockaddrunmap(&sa);
 552
 553         // Check if we get many connections from the same host
 554
 555         static sockaddr_t prev_sa;
 556         static int tarpit = -1;
 557
 558         if(tarpit >= 0) {
 559                 closesocket(tarpit);
 560                 tarpit = -1;
 561         }
 562
 563         if(!sockaddrcmp_noport(&sa, &prev_sa)) {
 564                 static int samehost_burst;
 565                 static int samehost_burst_time;
 566
 567                 if(now.tv_sec - samehost_burst_time > samehost_burst)
 568                         samehost_burst = 0;
 569                 else
 570                         samehost_burst -= now.tv_sec - samehost_burst_time;
 571
 572                 samehost_burst_time = now.tv_sec;
 573                 samehost_burst++;
 574
 575                 if(samehost_burst > max_connection_burst) {
 576                         tarpit = fd;
 577                         return;
 578                 }
 579         }
 580
 581         memcpy(&prev_sa, &sa, sizeof sa);
 582
 583         // Check if we get many connections from different hosts
 584
 585         static int connection_burst;
 586         static int connection_burst_time;
 587
 588         if(now.tv_sec - connection_burst_time > connection_burst)
 589                 connection_burst = 0;
 590         else
 591                 connection_burst -= now.tv_sec - connection_burst_time;
 592
 593         connection_burst_time = now.tv_sec;
 594         connection_burst++;
 595
 596         if(connection_burst >= max_connection_burst) {
 597                 connection_burst = max_connection_burst;
 598                 tarpit = fd;
 599                 return;
 600         }
 601
 602         // Accept the new connection
 603
 604         c = new_connection();
 605         c->name = xstrdup("<unknown>");
 606         c->outcompression = mesh->self->connection->outcompression;
 607
 608         c->address = sa;
 609         c->hostname = sockaddr2hostname(&sa);
 610         c->socket = fd;
 611         c->last_ping_time = now.tv_sec;
 612
 613         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection from %s", c->hostname);
 614
 615         io_add(&c->io, handle_meta_io, c, c->socket, IO_READ);
 616
 617         configure_tcp(c);
 618
 619         connection_add(c);
 620
 621         c->allow_request = ID;
 622         send_id(c);
 623 }
 624
 625 static void free_outgoing(outgoing_t *outgoing) {
 626         timeout_del(&outgoing->ev);
 627
 628         if(outgoing->ai)
 629                 freeaddrinfo(outgoing->ai);
 630
 631         if(outgoing->config_tree)
 632                 exit_configuration(&outgoing->config_tree);
 633
 634         if(outgoing->name)
 635                 free(outgoing->name);
 636
 637         free(outgoing);
 638 }
 639
 640 void try_outgoing_connections(void) {
 641         /* If there is no outgoing list yet, create one. Otherwise, mark all outgoings as deleted. */
 642
 643         if(!mesh->outgoings) {
 644                 mesh->outgoings = list_alloc((list_action_t)free_outgoing);
 645         } else {
 646                 for list_each(outgoing_t, outgoing, mesh->outgoings)
 647                         outgoing->timeout = -1;
 648         }
 649
 650         /* Make sure there is one outgoing_t in the list for each ConnectTo. */
 651
 652         // TODO: Drop support for ConnectTo since AutoConnect is now always on?
 653         for(config_t *cfg = lookup_config(mesh->config, "ConnectTo"); cfg; cfg = lookup_config_next(mesh->config, cfg)) {
 654                 char *name;
 655                 get_config_string(cfg, &name);
 656
 657                 if(!check_id(name)) {
 658                         logger(DEBUG_ALWAYS, LOG_ERR,
 659                                    "Invalid name for outgoing connection in %s line %d",
 660                                    cfg->file, cfg->line);
 661                         free(name);
 662                         continue;
 663                 }
 664
 665                 bool found = false;
 666
 667                 for list_each(outgoing_t, outgoing, mesh->outgoings) {
 668                         if(!strcmp(outgoing->name, name)) {
 669                                 found = true;
 670                                 outgoing->timeout = 0;
 671                                 break;
 672                         }
 673                 }
 674
 675                 if(!found) {
 676                         outgoing_t *outgoing = xzalloc(sizeof *outgoing);
 677                         outgoing->name = name;
 678                         list_insert_tail(mesh->outgoings, outgoing);
 679                         setup_outgoing_connection(outgoing);
 680                 }
 681         }
 682
 683         /* Terminate any connections whose outgoing_t is to be deleted. */
 684
 685         for list_each(connection_t, c, mesh->connections) {
 686                 if(c->outgoing && c->outgoing->timeout == -1) {
 687                         c->outgoing = NULL;
 688                         logger(DEBUG_CONNECTIONS, LOG_INFO, "No more outgoing connection to %s", c->name);
 689                         terminate_connection(c, c->status.active);
 690                 }
 691         }
 692
 693         /* Delete outgoing_ts for which there is no ConnectTo. */
 694
 695         for list_each(outgoing_t, outgoing, mesh->outgoings)
 696                 if(outgoing->timeout == -1)
 697                         list_delete_node(mesh->outgoings, node);
 698 }