src/net_socket.c

   1 /*
   2     net_socket.c -- Handle various kinds of sockets.
   3     Copyright (C) 1998-2005 Ivo Timmermans,
   4                   2000-2013 Guus Sliepen <guus@tinc-vpn.org>
   5                   2006      Scott Lamb <slamb@slamb.org>
   6                   2009      Florian Forster <octo@verplant.org>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License along
  19     with this program; if not, write to the Free Software Foundation, Inc.,
  20     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21 */
  22
  23 #include "system.h"
  24
  25 #include "conf.h"
  26 #include "connection.h"
  27 #include "control_common.h"
  28 #include "list.h"
  29 #include "logger.h"
  30 #include "meta.h"
  31 #include "names.h"
  32 #include "net.h"
  33 #include "netutl.h"
  34 #include "protocol.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 maxtimeout = 900;
  45 int seconds_till_retry = 5;
  46 int udp_rcvbuf = 0;
  47 int udp_sndbuf = 0;
  48
  49 listen_socket_t listen_socket[MAXSOCKETS];
  50 int listen_sockets;
  51 #ifndef HAVE_MINGW
  52 io_t unix_socket;
  53 #endif
  54 list_t *outgoing_list = NULL;
  55
  56 /* Setup sockets */
  57
  58 static void configure_tcp(connection_t *c) {
  59         int option;
  60
  61 #ifdef O_NONBLOCK
  62         int flags = fcntl(c->socket, F_GETFL);
  63
  64         if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) {
  65                 logger(DEBUG_ALWAYS, LOG_ERR, "fcntl for %s: %s", c->hostname, strerror(errno));
  66         }
  67 #elif defined(WIN32)
  68         unsigned long arg = 1;
  69
  70         if(ioctlsocket(c->socket, FIONBIO, &arg) != 0) {
  71                 logger(DEBUG_ALWAYS, LOG_ERR, "ioctlsocket for %s: %s", c->hostname, sockstrerror(sockerrno));
  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
  86 static bool bind_to_interface(int sd) {
  87         char *iface;
  88
  89 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
  90         struct ifreq ifr;
  91         int status;
  92 #endif /* defined(SOL_SOCKET) && defined(SO_BINDTODEVICE) */
  93
  94         if(!get_config_string (lookup_config (config_tree, "BindToInterface"), &iface))
  95                 return true;
  96
  97 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
  98         memset(&ifr, 0, sizeof(ifr));
  99         strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
 100         ifr.ifr_ifrn.ifrn_name[IFNAMSIZ - 1] = 0;
 101
 102         status = setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr));
 103         if(status) {
 104                 logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to interface %s: %s", iface,
 105                                 strerror(errno));
 106                 return false;
 107         }
 108 #else /* if !defined(SOL_SOCKET) || !defined(SO_BINDTODEVICE) */
 109         logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "BindToInterface");
 110 #endif
 111
 112         return true;
 113 }
 114
 115 int setup_listen_socket(const sockaddr_t *sa) {
 116         int nfd;
 117         char *addrstr;
 118         int option;
 119         char *iface;
 120
 121         nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
 122
 123         if(nfd < 0) {
 124                 logger(DEBUG_STATUS, LOG_ERR, "Creating metasocket failed: %s", sockstrerror(sockerrno));
 125                 return -1;
 126         }
 127
 128 #ifdef FD_CLOEXEC
 129         fcntl(nfd, F_SETFD, FD_CLOEXEC);
 130 #endif
 131
 132         /* Optimize TCP settings */
 133
 134         option = 1;
 135         setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof option);
 136
 137 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
 138         if(sa->sa.sa_family == AF_INET6)
 139                 setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
 140 #endif
 141
 142         if(get_config_string
 143            (lookup_config(config_tree, "BindToInterface"), &iface)) {
 144 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
 145                 struct ifreq ifr;
 146
 147                 memset(&ifr, 0, sizeof ifr);
 148                 strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
 149
 150                 if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof ifr)) {
 151                         closesocket(nfd);
 152                         logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to interface %s: %s", iface,
 153                                    strerror(sockerrno));
 154                         return -1;
 155                 }
 156 #else
 157                 logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "BindToInterface");
 158 #endif
 159         }
 160
 161         if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
 162                 closesocket(nfd);
 163                 addrstr = sockaddr2hostname(sa);
 164                 logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to %s/tcp: %s", addrstr, sockstrerror(sockerrno));
 165                 free(addrstr);
 166                 return -1;
 167         }
 168
 169         if(listen(nfd, 3)) {
 170                 closesocket(nfd);
 171                 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "listen", sockstrerror(sockerrno));
 172                 return -1;
 173         }
 174
 175         return nfd;
 176 }
 177
 178 int setup_vpn_in_socket(const sockaddr_t *sa) {
 179         int nfd;
 180         char *addrstr;
 181         int option;
 182
 183         nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
 184
 185         if(nfd < 0) {
 186                 logger(DEBUG_ALWAYS, LOG_ERR, "Creating UDP socket failed: %s", sockstrerror(sockerrno));
 187                 return -1;
 188         }
 189
 190 #ifdef FD_CLOEXEC
 191         fcntl(nfd, F_SETFD, FD_CLOEXEC);
 192 #endif
 193
 194 #ifdef O_NONBLOCK
 195         {
 196                 int flags = fcntl(nfd, F_GETFL);
 197
 198                 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
 199                         closesocket(nfd);
 200                         logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "fcntl",
 201                                    strerror(errno));
 202                         return -1;
 203                 }
 204         }
 205 #elif defined(WIN32)
 206         {
 207                 unsigned long arg = 1;
 208                 if(ioctlsocket(nfd, FIONBIO, &arg) != 0) {
 209                         closesocket(nfd);
 210                         logger(DEBUG_ALWAYS, LOG_ERR, "Call to `%s' failed: %s", "ioctlsocket", sockstrerror(sockerrno));
 211                         return -1;
 212                 }
 213         }
 214 #endif
 215
 216         option = 1;
 217         setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof option);
 218         setsockopt(nfd, SOL_SOCKET, SO_BROADCAST, (void *)&option, sizeof option);
 219
 220         if(udp_rcvbuf && setsockopt(nfd, SOL_SOCKET, SO_RCVBUF, (void *)&udp_rcvbuf, sizeof(udp_rcvbuf)))
 221                 logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_RCVBUF to %i: %s", udp_rcvbuf, strerror(errno));
 222
 223         if(udp_sndbuf && setsockopt(nfd, SOL_SOCKET, SO_SNDBUF, (void *)&udp_sndbuf, sizeof(udp_sndbuf)))
 224                 logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_SNDBUF to %i: %s", udp_sndbuf, strerror(errno));
 225
 226 #if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
 227         if(sa->sa.sa_family == AF_INET6)
 228                 setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
 229 #endif
 230
 231 #if defined(IP_DONTFRAG) && !defined(IP_DONTFRAGMENT)
 232 #define IP_DONTFRAGMENT IP_DONTFRAG
 233 #endif
 234
 235 #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
 236         if(myself->options & OPTION_PMTU_DISCOVERY) {
 237                 option = IP_PMTUDISC_DO;
 238                 setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, (void *)&option, sizeof(option));
 239         }
 240 #elif defined(IPPROTO_IP) && defined(IP_DONTFRAGMENT)
 241         if(myself->options & OPTION_PMTU_DISCOVERY) {
 242                 option = 1;
 243                 setsockopt(nfd, IPPROTO_IP, IP_DONTFRAGMENT, (void *)&option, sizeof(option));
 244         }
 245 #else
 246 #warning No way to disable IPv4 fragmentation
 247 #endif
 248
 249 #if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
 250         if(myself->options & OPTION_PMTU_DISCOVERY) {
 251                 option = IPV6_PMTUDISC_DO;
 252                 setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, (void *)&option, sizeof(option));
 253         }
 254 #elif defined(IPPROTO_IPV6) && defined(IPV6_DONTFRAG)
 255         if(myself->options & OPTION_PMTU_DISCOVERY) {
 256                 option = 1;
 257                 setsockopt(nfd, IPPROTO_IPV6, IPV6_DONTFRAG, (void *)&option, sizeof(option));
 258         }
 259 #else
 260 #warning No way to disable IPv6 fragmentation
 261 #endif
 262
 263         if (!bind_to_interface(nfd)) {
 264                 closesocket(nfd);
 265                 return -1;
 266         }
 267
 268         if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
 269                 closesocket(nfd);
 270                 addrstr = sockaddr2hostname(sa);
 271                 logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to %s/udp: %s", addrstr, sockstrerror(sockerrno));
 272                 free(addrstr);
 273                 return -1;
 274         }
 275
 276         return nfd;
 277 } /* int setup_vpn_in_socket */
 278
 279 static void retry_outgoing_handler(void *data) {
 280         setup_outgoing_connection(data);
 281 }
 282
 283 void retry_outgoing(outgoing_t *outgoing) {
 284         outgoing->timeout += 5;
 285
 286         if(outgoing->timeout > maxtimeout)
 287                 outgoing->timeout = maxtimeout;
 288
 289         timeout_add(&outgoing->ev, retry_outgoing_handler, outgoing, &(struct timeval){outgoing->timeout, rand() % 100000});
 290
 291         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Trying to re-establish outgoing connection in %d seconds", outgoing->timeout);
 292 }
 293
 294 void finish_connecting(connection_t *c) {
 295         logger(DEBUG_CONNECTIONS, LOG_INFO, "Connected to %s (%s)", c->name, c->hostname);
 296
 297         if(proxytype != PROXY_EXEC)
 298                 configure_tcp(c);
 299
 300         c->last_ping_time = time(NULL);
 301         c->status.connecting = false;
 302
 303         send_id(c);
 304 }
 305
 306 static void do_outgoing_pipe(connection_t *c, char *command) {
 307 #ifndef HAVE_MINGW
 308         int fd[2];
 309
 310         if(socketpair(AF_UNIX, SOCK_STREAM, 0, fd)) {
 311                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not create socketpair: %s", strerror(errno));
 312                 return;
 313         }
 314
 315         if(fork()) {
 316                 c->socket = fd[0];
 317                 close(fd[1]);
 318                 logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Using proxy %s", command);
 319                 return;
 320         }
 321
 322         close(0);
 323         close(1);
 324         close(fd[0]);
 325         dup2(fd[1], 0);
 326         dup2(fd[1], 1);
 327         close(fd[1]);
 328
 329         // Other filedescriptors should be closed automatically by CLOEXEC
 330
 331         char *host = NULL;
 332         char *port = NULL;
 333
 334         sockaddr2str(&c->address, &host, &port);
 335         setenv("REMOTEADDRESS", host, true);
 336         setenv("REMOTEPORT", port, true);
 337         setenv("NODE", c->name, true);
 338         setenv("NAME", myself->name, true);
 339         if(netname)
 340                 setenv("NETNAME", netname, true);
 341
 342         int result = system(command);
 343         if(result < 0)
 344                 logger(DEBUG_ALWAYS, LOG_ERR, "Could not execute %s: %s", command, strerror(errno));
 345         else if(result)
 346                 logger(DEBUG_ALWAYS, LOG_ERR, "%s exited with non-zero status %d", command, result);
 347         exit(result);
 348 #else
 349         logger(DEBUG_ALWAYS, LOG_ERR, "Proxy type exec not supported on this platform!");
 350         return;
 351 #endif
 352 }
 353
 354 static void handle_meta_write(connection_t *c) {
 355         ssize_t outlen = send(c->socket, c->outbuf.data + c->outbuf.offset, c->outbuf.len - c->outbuf.offset, 0);
 356         if(outlen <= 0) {
 357                 if(!errno || errno == EPIPE) {
 358                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection closed by %s (%s)", c->name, c->hostname);
 359                 } else if(sockwouldblock(sockerrno)) {
 360                         logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Sending %d bytes to %s (%s) would block", c->outbuf.len - c->outbuf.offset, c->name, c->hostname);
 361                         return;
 362                 } else {
 363                         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));
 364                 }
 365
 366                 terminate_connection(c, c->status.active);
 367                 return;
 368         }
 369
 370         buffer_read(&c->outbuf, outlen);
 371         if(!c->outbuf.len)
 372                 io_set(&c->io, IO_READ);
 373 }
 374
 375 static void handle_meta_io(void *data, int flags) {
 376         connection_t *c = data;
 377
 378         if(c->status.connecting) {
 379                 c->status.connecting = false;
 380
 381                 int result;
 382                 socklen_t len = sizeof result;
 383                 getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len);
 384
 385                 if(!result)
 386                         finish_connecting(c);
 387                 else {
 388                         logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Error while connecting to %s (%s): %s", c->name, c->hostname, sockstrerror(result));
 389                         terminate_connection(c, false);
 390                         return;
 391                 }
 392         }
 393
 394         if(flags & IO_WRITE)
 395                 handle_meta_write(c);
 396         else
 397                 handle_meta_connection_data(c);
 398 }
 399
 400 bool do_outgoing_connection(outgoing_t *outgoing) {
 401         char *address, *port, *space;
 402         struct addrinfo *proxyai = NULL;
 403         int result;
 404
 405 begin:
 406         if(!outgoing->ai) {
 407                 if(!outgoing->cfg) {
 408                         logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not set up a meta connection to %s", outgoing->name);
 409                         retry_outgoing(outgoing);
 410                         return false;
 411                 }
 412
 413                 get_config_string(outgoing->cfg, &address);
 414
 415                 space = strchr(address, ' ');
 416                 if(space) {
 417                         port = xstrdup(space + 1);
 418                         *space = 0;
 419                 } else {
 420                         if(!get_config_string(lookup_config(outgoing->config_tree, "Port"), &port))
 421                                 port = xstrdup("655");
 422                 }
 423
 424                 outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
 425                 free(address);
 426                 free(port);
 427
 428                 outgoing->aip = outgoing->ai;
 429                 outgoing->cfg = lookup_config_next(outgoing->config_tree, outgoing->cfg);
 430         }
 431
 432         if(!outgoing->aip) {
 433                 if(outgoing->ai)
 434                         freeaddrinfo(outgoing->ai);
 435                 outgoing->ai = NULL;
 436                 goto begin;
 437         }
 438
 439         connection_t *c = new_connection();
 440         c->outgoing = outgoing;
 441
 442         memcpy(&c->address, outgoing->aip->ai_addr, outgoing->aip->ai_addrlen);
 443         outgoing->aip = outgoing->aip->ai_next;
 444
 445         c->hostname = sockaddr2hostname(&c->address);
 446
 447         logger(DEBUG_CONNECTIONS, LOG_INFO, "Trying to connect to %s (%s)", outgoing->name, c->hostname);
 448
 449         if(!proxytype) {
 450                 c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
 451                 configure_tcp(c);
 452         } else if(proxytype == PROXY_EXEC) {
 453                 do_outgoing_pipe(c, proxyhost);
 454         } else {
 455                 proxyai = str2addrinfo(proxyhost, proxyport, SOCK_STREAM);
 456                 if(!proxyai) {
 457                         free_connection(c);
 458                         goto begin;
 459                 }
 460                 logger(DEBUG_CONNECTIONS, LOG_INFO, "Using proxy at %s port %s", proxyhost, proxyport);
 461                 c->socket = socket(proxyai->ai_family, SOCK_STREAM, IPPROTO_TCP);
 462         }
 463
 464         if(c->socket == -1) {
 465                 logger(DEBUG_CONNECTIONS, LOG_ERR, "Creating socket for %s failed: %s", c->hostname, sockstrerror(sockerrno));
 466                 free_connection(c);
 467                 goto begin;
 468         }
 469
 470 #ifdef FD_CLOEXEC
 471         fcntl(c->socket, F_SETFD, FD_CLOEXEC);
 472 #endif
 473
 474         if(proxytype != PROXY_EXEC) {
 475 #if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
 476                 int option = 1;
 477                 if(c->address.sa.sa_family == AF_INET6)
 478                         setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
 479 #endif
 480
 481                 bind_to_interface(c->socket);
 482         }
 483
 484         /* Connect */
 485
 486         if(!proxytype) {
 487                 result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
 488         } else if(proxytype == PROXY_EXEC) {
 489                 result = 0;
 490         } else {
 491                 result = connect(c->socket, proxyai->ai_addr, proxyai->ai_addrlen);
 492                 freeaddrinfo(proxyai);
 493         }
 494
 495         if(result == -1 && !sockinprogress(sockerrno)) {
 496                 logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not connect to %s (%s): %s", outgoing->name, c->hostname, sockstrerror(sockerrno));
 497                 free_connection(c);
 498
 499                 goto begin;
 500         }
 501
 502         /* Now that there is a working socket, fill in the rest and register this connection. */
 503
 504         c->status.connecting = true;
 505         c->name = xstrdup(outgoing->name);
 506         c->outcipher = myself->connection->outcipher;
 507         c->outdigest = myself->connection->outdigest;
 508         c->outmaclength = myself->connection->outmaclength;
 509         c->outcompression = myself->connection->outcompression;
 510         c->last_ping_time = time(NULL);
 511
 512         connection_add(c);
 513
 514         io_add(&c->io, handle_meta_io, c, c->socket, IO_READ|IO_WRITE);
 515
 516         return true;
 517 }
 518
 519 void setup_outgoing_connection(outgoing_t *outgoing) {
 520         timeout_del(&outgoing->ev);
 521
 522         node_t *n = lookup_node(outgoing->name);
 523
 524         if(n && n->connection) {
 525                 logger(DEBUG_CONNECTIONS, LOG_INFO, "Already connected to %s", outgoing->name);
 526
 527                 n->connection->outgoing = outgoing;
 528                 return;
 529         }
 530
 531         init_configuration(&outgoing->config_tree);
 532         read_host_config(outgoing->config_tree, outgoing->name);
 533         outgoing->cfg = lookup_config(outgoing->config_tree, "Address");
 534
 535         if(!outgoing->cfg) {
 536                 logger(DEBUG_ALWAYS, LOG_ERR, "No address specified for %s", outgoing->name);
 537                 return;
 538         }
 539
 540         do_outgoing_connection(outgoing);
 541 }
 542
 543 /*
 544   accept a new tcp connect and create a
 545   new connection
 546 */
 547 void handle_new_meta_connection(void *data, int flags) {
 548         listen_socket_t *l = data;
 549         connection_t *c;
 550         sockaddr_t sa;
 551         int fd;
 552         socklen_t len = sizeof sa;
 553
 554         fd = accept(l->tcp.fd, &sa.sa, &len);
 555
 556         if(fd < 0) {
 557                 logger(DEBUG_ALWAYS, LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
 558                 return;
 559         }
 560
 561         sockaddrunmap(&sa);
 562
 563         c = new_connection();
 564         c->name = xstrdup("<unknown>");
 565         c->outcipher = myself->connection->outcipher;
 566         c->outdigest = myself->connection->outdigest;
 567         c->outmaclength = myself->connection->outmaclength;
 568         c->outcompression = myself->connection->outcompression;
 569
 570         c->address = sa;
 571         c->hostname = sockaddr2hostname(&sa);
 572         c->socket = fd;
 573         c->last_ping_time = time(NULL);
 574
 575         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection from %s", c->hostname);
 576
 577         io_add(&c->io, handle_meta_io, c, c->socket, IO_READ);
 578
 579         configure_tcp(c);
 580
 581         connection_add(c);
 582
 583         c->allow_request = ID;
 584         send_id(c);
 585 }
 586
 587 #ifndef HAVE_MINGW
 588 /*
 589   accept a new UNIX socket connection
 590 */
 591 void handle_new_unix_connection(void *data, int flags) {
 592         io_t *io = data;
 593         connection_t *c;
 594         sockaddr_t sa;
 595         int fd;
 596         socklen_t len = sizeof sa;
 597
 598         fd = accept(io->fd, &sa.sa, &len);
 599
 600         if(fd < 0) {
 601                 logger(DEBUG_ALWAYS, LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
 602                 return;
 603         }
 604
 605         sockaddrunmap(&sa);
 606
 607         c = new_connection();
 608         c->name = xstrdup("<control>");
 609         c->address = sa;
 610         c->hostname = xstrdup("localhost port unix");
 611         c->socket = fd;
 612         c->last_ping_time = time(NULL);
 613
 614         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection from %s", c->hostname);
 615
 616         io_add(&c->io, handle_meta_io, c, c->socket, IO_READ);
 617
 618         connection_add(c);
 619
 620         c->allow_request = ID;
 621
 622         send_id(c);
 623 }
 624 #endif
 625
 626 static void free_outgoing(outgoing_t *outgoing) {
 627         timeout_del(&outgoing->ev);
 628
 629         if(outgoing->ai)
 630                 freeaddrinfo(outgoing->ai);
 631
 632         if(outgoing->config_tree)
 633                 exit_configuration(&outgoing->config_tree);
 634
 635         if(outgoing->name)
 636                 free(outgoing->name);
 637
 638         free(outgoing);
 639 }
 640
 641 void try_outgoing_connections(void) {
 642         /* If there is no outgoing list yet, create one. Otherwise, mark all outgoings as deleted. */
 643
 644         if(!outgoing_list) {
 645                 outgoing_list = list_alloc((list_action_t)free_outgoing);
 646         } else {
 647                 for list_each(outgoing_t, outgoing, outgoing_list)
 648                         outgoing->timeout = -1;
 649         }
 650
 651         /* Make sure there is one outgoing_t in the list for each ConnectTo. */
 652
 653         for(config_t *cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, 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, outgoing_list) {
 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 = xmalloc_and_zero(sizeof *outgoing);
 677                         outgoing->name = name;
 678                         list_insert_tail(outgoing_list, 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, connection_list) {
 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, outgoing_list)
 696                 if(outgoing->timeout == -1)
 697                         list_delete_node(outgoing_list, node);
 698 }