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

   1 #include "system.h"
   2
   3 #include <catta/core.h>
   4 #include <catta/lookup.h>
   5 #include <catta/publish.h>
   6 #include <catta/log.h>
   7 #include <catta/simple-watch.h>
   8 #include <catta/malloc.h>
   9 #include <catta/alternative.h>
  10 #include <catta/error.h>
  11
  12 #if defined(__APPLE__) || defined(__unix) && !defined(__linux)
  13 #include <net/route.h>
  14 #elif defined(__linux)
  15 #include <asm/types.h>
  16 #include <linux/netlink.h>
  17 #include <linux/rtnetlink.h>
  18 #endif
  19
  20 #include "meshlink_internal.h"
  21 #include "event.h"
  22 #include "discovery.h"
  23 #include "sockaddr.h"
  24 #include "logger.h"
  25 #include "node.h"
  26 #include "connection.h"
  27 #include "xalloc.h"
  28
  29 #define MESHLINK_MDNS_SERVICE_TYPE "_%s._tcp"
  30 #define MESHLINK_MDNS_NAME_KEY "name"
  31 #define MESHLINK_MDNS_FINGERPRINT_KEY "fingerprint"
  32
  33 static void generate_rand_string(meshlink_handle_t *mesh, char *buffer, size_t size) {
  34         assert(size);
  35
  36         for(size_t i = 0; i < (size - 1); ++i) {
  37                 buffer[i] = 'a' + prng(mesh, 'z' - 'a' + 1);
  38         }
  39
  40         buffer[size - 1] = '\0';
  41 }
  42
  43 static void discovery_entry_group_callback(CattaServer *server, CattaSEntryGroup *group, CattaEntryGroupState state, void *userdata) {
  44         (void)server;
  45         (void)group;
  46         meshlink_handle_t *mesh = userdata;
  47
  48         assert(mesh);
  49         assert(mesh->catta_server);
  50         assert(mesh->catta_poll);
  51
  52         /* Called whenever the entry group state changes */
  53         switch(state) {
  54         case CATTA_ENTRY_GROUP_ESTABLISHED:
  55                 /* The entry group has been established successfully */
  56                 logger(mesh, MESHLINK_DEBUG, "Catta Service successfully established.\n");
  57                 break;
  58
  59         case CATTA_ENTRY_GROUP_COLLISION:
  60                 logger(mesh, MESHLINK_WARNING, "Catta Service collision.\n");
  61                 // @TODO can we just set a new name and retry?
  62                 break;
  63
  64         case CATTA_ENTRY_GROUP_FAILURE :
  65                 /* Some kind of failure happened while we were registering our services */
  66                 logger(mesh, MESHLINK_ERROR, "Catta Entry group failure: %s\n", catta_strerror(catta_server_errno(mesh->catta_server)));
  67                 catta_simple_poll_quit(mesh->catta_poll);
  68                 break;
  69
  70         case CATTA_ENTRY_GROUP_UNCOMMITED:
  71         case CATTA_ENTRY_GROUP_REGISTERING:
  72                 break;
  73         }
  74 }
  75
  76
  77 static void discovery_create_services(meshlink_handle_t *mesh) {
  78         char *fingerprint = NULL;
  79         char *txt_name = NULL;
  80         char *txt_fingerprint = NULL;
  81
  82         assert(mesh);
  83         assert(mesh->name);
  84         assert(mesh->myport);
  85         assert(mesh->catta_server);
  86         assert(mesh->catta_poll);
  87         assert(mesh->catta_servicetype);
  88         assert(mesh->self);
  89
  90         logger(mesh, MESHLINK_DEBUG, "Adding service\n");
  91
  92         /* Ifthis is the first time we're called, let's create a new entry group */
  93         if(!(mesh->catta_group = catta_s_entry_group_new(mesh->catta_server, discovery_entry_group_callback, mesh))) {
  94                 logger(mesh, MESHLINK_ERROR, "catta_entry_group_new() failed: %s\n", catta_strerror(catta_server_errno(mesh->catta_server)));
  95                 goto fail;
  96         }
  97
  98         /* Create txt records */
  99         fingerprint = meshlink_get_fingerprint(mesh, (meshlink_node_t *)mesh->self);
 100         xasprintf(&txt_name, "%s=%s", MESHLINK_MDNS_NAME_KEY, mesh->name);
 101         xasprintf(&txt_fingerprint, "%s=%s", MESHLINK_MDNS_FINGERPRINT_KEY, fingerprint);
 102
 103         /* Add the service */
 104         int ret = 0;
 105
 106         if((ret = catta_server_add_service(mesh->catta_server, mesh->catta_group, CATTA_IF_UNSPEC, CATTA_PROTO_UNSPEC, 0, fingerprint, mesh->catta_servicetype, NULL, NULL, atoi(mesh->myport), txt_name, txt_fingerprint, NULL)) < 0) {
 107                 logger(mesh, MESHLINK_ERROR, "Failed to add service: %s\n", catta_strerror(ret));
 108                 goto fail;
 109         }
 110
 111         /* Tell the server to register the service */
 112         if((ret = catta_s_entry_group_commit(mesh->catta_group)) < 0) {
 113                 logger(mesh, MESHLINK_ERROR, "Failed to commit entry_group: %s\n", catta_strerror(ret));
 114                 goto fail;
 115         }
 116
 117         goto done;
 118
 119 fail:
 120         catta_simple_poll_quit(mesh->catta_poll);
 121
 122 done:
 123         free(fingerprint);
 124         free(txt_name);
 125         free(txt_fingerprint);
 126 }
 127
 128 static void discovery_server_callback(CattaServer *server, CattaServerState state, void *userdata) {
 129         (void)server;
 130         meshlink_handle_t *mesh = userdata;
 131
 132         assert(mesh);
 133
 134         switch(state) {
 135         case CATTA_SERVER_RUNNING:
 136
 137                 /* The serve has startup successfully and registered its host
 138                  * name on the network, so it's time to create our services */
 139                 if(pthread_mutex_lock(&mesh->mutex) != 0) {
 140                         abort();
 141                 }
 142
 143                 if(!mesh->catta_group) {
 144                         discovery_create_services(mesh);
 145                 }
 146
 147                 pthread_mutex_unlock(&mesh->mutex);
 148
 149                 break;
 150
 151         case CATTA_SERVER_COLLISION: {
 152                 /* A host name collision happened. Let's pick a new name for the server */
 153                 char hostname[17];
 154                 generate_rand_string(mesh, hostname, sizeof(hostname));
 155
 156                 if(pthread_mutex_lock(&mesh->mutex) != 0) {
 157                         abort();
 158                 }
 159
 160                 assert(mesh->catta_server);
 161                 assert(mesh->catta_poll);
 162
 163                 int result = catta_server_set_host_name(mesh->catta_server, hostname);
 164
 165                 if(result < 0) {
 166                         catta_simple_poll_quit(mesh->catta_poll);
 167                 }
 168
 169                 pthread_mutex_unlock(&mesh->mutex);
 170         }
 171         break;
 172
 173         case CATTA_SERVER_REGISTERING:
 174                 if(pthread_mutex_lock(&mesh->mutex) != 0) {
 175                         abort();
 176                 }
 177
 178                 /* Let's drop our registered services. When the server is back
 179                  * in CATTA_SERVER_RUNNING state we will register them
 180                  * again with the new host name. */
 181                 if(mesh->catta_group) {
 182                         catta_s_entry_group_reset(mesh->catta_group);
 183                         mesh->catta_group = NULL;
 184                 }
 185
 186                 pthread_mutex_unlock(&mesh->mutex);
 187
 188                 break;
 189
 190         case CATTA_SERVER_FAILURE:
 191                 if(pthread_mutex_lock(&mesh->mutex) != 0) {
 192                         abort();
 193                 }
 194
 195                 assert(mesh->catta_server);
 196                 assert(mesh->catta_poll);
 197
 198                 /* Terminate on failure */
 199                 catta_simple_poll_quit(mesh->catta_poll);
 200
 201                 pthread_mutex_unlock(&mesh->mutex);
 202                 break;
 203
 204         case CATTA_SERVER_INVALID:
 205                 break;
 206         }
 207 }
 208
 209 static void discovery_resolve_callback(CattaSServiceResolver *resolver, CattaIfIndex interface_, CattaProtocol protocol, CattaResolverEvent event, const char *name, const char *type, const char *domain, const char *host_name, const CattaAddress *address, uint16_t port, CattaStringList *txt, CattaLookupResultFlags flags, void *userdata) {
 210         (void)interface_;
 211         (void)protocol;
 212         (void)flags;
 213         (void)name;
 214         (void)type;
 215         (void)domain;
 216         (void)host_name;
 217
 218         meshlink_handle_t *mesh = userdata;
 219
 220         assert(mesh);
 221
 222         if(event != CATTA_RESOLVER_FOUND) {
 223                 catta_s_service_resolver_free(resolver);
 224                 return;
 225         }
 226
 227         // retrieve fingerprint
 228         CattaStringList *node_name_li = catta_string_list_find(txt, MESHLINK_MDNS_NAME_KEY);
 229         CattaStringList *node_fp_li = catta_string_list_find(txt, MESHLINK_MDNS_FINGERPRINT_KEY);
 230
 231         if(node_name_li && node_fp_li) {
 232                 char *node_name = (char *)catta_string_list_get_text(node_name_li) + strlen(MESHLINK_MDNS_NAME_KEY);
 233                 char *node_fp = (char *)catta_string_list_get_text(node_fp_li) + strlen(MESHLINK_MDNS_FINGERPRINT_KEY);
 234
 235                 if(node_name[0] == '=' && node_fp[0] == '=') {
 236                         if(pthread_mutex_lock(&mesh->mutex) != 0) {
 237                                 abort();
 238                         }
 239
 240                         node_name += 1;
 241
 242                         meshlink_node_t *node = meshlink_get_node(mesh, node_name);
 243
 244                         if(node) {
 245                                 logger(mesh, MESHLINK_INFO, "Node %s is part of the mesh network.\n", node->name);
 246
 247                                 sockaddr_t naddress;
 248                                 memset(&naddress, 0, sizeof(naddress));
 249
 250                                 switch(address->proto) {
 251                                 case CATTA_PROTO_INET: {
 252                                         naddress.in.sin_family = AF_INET;
 253                                         naddress.in.sin_port = htons(port);
 254                                         naddress.in.sin_addr.s_addr = address->data.ipv4.address;
 255                                 }
 256                                 break;
 257
 258                                 case CATTA_PROTO_INET6: {
 259                                         naddress.in6.sin6_family = AF_INET6;
 260                                         naddress.in6.sin6_port = htons(port);
 261                                         memcpy(naddress.in6.sin6_addr.s6_addr, address->data.ipv6.address, sizeof(naddress.in6.sin6_addr.s6_addr));
 262                                 }
 263                                 break;
 264
 265                                 default:
 266                                         naddress.unknown.family = AF_UNKNOWN;
 267                                         break;
 268                                 }
 269
 270                                 if(naddress.unknown.family != AF_UNKNOWN) {
 271                                         node_t *n = (node_t *)node;
 272                                         connection_t *c = n->connection;
 273
 274                                         n->catta_address = naddress;
 275                                         node_add_recent_address(mesh, n, &naddress);
 276
 277                                         if(c && c->outgoing && !c->status.active) {
 278                                                 c->outgoing->timeout = 0;
 279
 280                                                 if(c->outgoing->ev.cb) {
 281                                                         timeout_set(&mesh->loop, &c->outgoing->ev, &(struct timespec) {
 282                                                                 0, 0
 283                                                         });
 284                                                 }
 285
 286                                                 c->last_ping_time = -3600;
 287                                         }
 288
 289                                 } else {
 290                                         logger(mesh, MESHLINK_WARNING, "Could not resolve node %s to a known address family type.\n", node->name);
 291                                 }
 292                         } else {
 293                                 logger(mesh, MESHLINK_WARNING, "Node %s is not part of the mesh network.\n", node_name);
 294                         }
 295
 296                         pthread_mutex_unlock(&mesh->mutex);
 297                 }
 298         }
 299
 300         catta_s_service_resolver_free(resolver);
 301 }
 302
 303 static void discovery_browse_callback(CattaSServiceBrowser *browser, CattaIfIndex interface_, CattaProtocol protocol, CattaBrowserEvent event, const char *name, const char *type, const char *domain, CattaLookupResultFlags flags, void *userdata) {
 304         (void)browser;
 305         (void)flags;
 306         meshlink_handle_t *mesh = userdata;
 307
 308         /* Called whenever a new services becomes available on the LAN or is removed from the LAN */
 309         switch(event) {
 310         case CATTA_BROWSER_FAILURE:
 311                 if(pthread_mutex_lock(&mesh->mutex) != 0) {
 312                         abort();
 313                 }
 314
 315                 catta_simple_poll_quit(mesh->catta_poll);
 316                 pthread_mutex_unlock(&mesh->mutex);
 317                 break;
 318
 319         case CATTA_BROWSER_NEW:
 320                 if(pthread_mutex_lock(&mesh->mutex) != 0) {
 321                         abort();
 322                 }
 323
 324                 catta_s_service_resolver_new(mesh->catta_server, interface_, protocol, name, type, domain, CATTA_PROTO_UNSPEC, 0, discovery_resolve_callback, mesh);
 325                 handle_network_change(mesh, ++mesh->catta_interfaces);
 326                 pthread_mutex_unlock(&mesh->mutex);
 327                 break;
 328
 329         case CATTA_BROWSER_REMOVE:
 330                 if(pthread_mutex_lock(&mesh->mutex) != 0) {
 331                         abort();
 332                 }
 333
 334                 handle_network_change(mesh, --mesh->catta_interfaces);
 335                 pthread_mutex_unlock(&mesh->mutex);
 336                 break;
 337
 338         case CATTA_BROWSER_ALL_FOR_NOW:
 339         case CATTA_BROWSER_CACHE_EXHAUSTED:
 340                 break;
 341         }
 342 }
 343
 344 static void discovery_log_cb(CattaLogLevel level, const char *txt) {
 345         meshlink_log_level_t mlevel = MESHLINK_CRITICAL;
 346
 347         switch(level) {
 348         case CATTA_LOG_ERROR:
 349                 mlevel = MESHLINK_ERROR;
 350                 break;
 351
 352         case CATTA_LOG_WARN:
 353                 mlevel = MESHLINK_WARNING;
 354                 break;
 355
 356         case CATTA_LOG_NOTICE:
 357         case CATTA_LOG_INFO:
 358                 mlevel = MESHLINK_INFO;
 359                 break;
 360
 361         case CATTA_LOG_DEBUG:
 362         default:
 363                 mlevel = MESHLINK_DEBUG;
 364                 break;
 365         }
 366
 367         logger(NULL, mlevel, "%s\n", txt);
 368 }
 369
 370 static void *discovery_loop(void *userdata) {
 371         bool status = false;
 372         meshlink_handle_t *mesh = userdata;
 373         assert(mesh);
 374
 375         if(pthread_mutex_lock(&mesh->discovery_mutex) != 0) {
 376                 abort();
 377         }
 378
 379         // handle catta logs
 380         catta_set_log_function(discovery_log_cb);
 381
 382         // create service type string
 383         char appname[strlen(mesh->appname) + 2];
 384         strcpy(appname, mesh->appname);
 385
 386         for(char *p = appname; *p; p++) {
 387                 if(!isalnum(*p) && *p != '_' && *p != '-') {
 388                         *p = '_';
 389                 }
 390         }
 391
 392         if(!appname[1]) {
 393                 appname[1] = '_';
 394                 appname[2] = '\0';
 395         }
 396
 397         size_t servicetype_strlen = sizeof(MESHLINK_MDNS_SERVICE_TYPE) + strlen(appname) + 1;
 398         mesh->catta_servicetype = malloc(servicetype_strlen);
 399
 400         if(mesh->catta_servicetype == NULL) {
 401                 logger(mesh, MESHLINK_ERROR, "Failed to allocate memory for service type string.\n");
 402                 goto fail;
 403         }
 404
 405         snprintf(mesh->catta_servicetype, servicetype_strlen, MESHLINK_MDNS_SERVICE_TYPE, appname);
 406
 407         // Allocate discovery loop object
 408         if(!(mesh->catta_poll = catta_simple_poll_new())) {
 409                 logger(mesh, MESHLINK_ERROR, "Failed to create discovery poll object.\n");
 410                 goto fail;
 411         }
 412
 413         // generate some unique host name (we actually do not care about it)
 414         char hostname[17];
 415         generate_rand_string(mesh, hostname, sizeof(hostname));
 416
 417         // Let's set the host name for this server.
 418         CattaServerConfig config;
 419         catta_server_config_init(&config);
 420         config.host_name = catta_strdup(hostname);
 421         config.publish_workstation = 0;
 422         config.disallow_other_stacks = 0;
 423         config.publish_hinfo = 0;
 424         config.publish_addresses = 1;
 425         config.publish_no_reverse = 1;
 426         config.allow_point_to_point = 1;
 427
 428         /* Allocate a new server */
 429         int error;
 430         const CattaPoll *poller = catta_simple_poll_get(mesh->catta_poll);
 431
 432         if(!poller) {
 433                 logger(mesh, MESHLINK_ERROR, "Failed to create discovery server: %s\n", catta_strerror(error));
 434                 goto fail;
 435         }
 436
 437         mesh->catta_server = catta_server_new(poller, &config, discovery_server_callback, mesh, &error);
 438
 439         /* Free the configuration data */
 440         catta_server_config_free(&config);
 441
 442         /* Check whether creating the server object succeeded */
 443         if(!mesh->catta_server) {
 444                 logger(mesh, MESHLINK_ERROR, "Failed to create discovery server: %s\n", catta_strerror(error));
 445                 goto fail;
 446         }
 447
 448         // Create the service browser
 449         if(!(mesh->catta_browser = catta_s_service_browser_new(mesh->catta_server, CATTA_IF_UNSPEC, CATTA_PROTO_UNSPEC, mesh->catta_servicetype, NULL, 0, discovery_browse_callback, mesh))) {
 450                 logger(mesh, MESHLINK_ERROR, "Failed to create discovery service browser: %s\n", catta_strerror(catta_server_errno(mesh->catta_server)));
 451                 goto fail;
 452         }
 453
 454         status = true;
 455
 456 fail:
 457
 458         pthread_cond_broadcast(&mesh->discovery_cond);
 459         pthread_mutex_unlock(&mesh->discovery_mutex);
 460
 461         if(status) {
 462                 catta_simple_poll_loop(mesh->catta_poll);
 463         }
 464
 465         if(mesh->catta_browser) {
 466                 catta_s_service_browser_free(mesh->catta_browser);
 467                 mesh->catta_browser = NULL;
 468         }
 469
 470         if(mesh->catta_group) {
 471                 catta_s_entry_group_reset(mesh->catta_group);
 472                 catta_s_entry_group_free(mesh->catta_group);
 473                 mesh->catta_group = NULL;
 474         }
 475
 476         if(mesh->catta_server) {
 477                 catta_server_free(mesh->catta_server);
 478                 mesh->catta_server = NULL;
 479         }
 480
 481         if(mesh->catta_poll) {
 482                 catta_simple_poll_free(mesh->catta_poll);
 483                 mesh->catta_poll = NULL;
 484         }
 485
 486         if(mesh->catta_servicetype) {
 487                 free(mesh->catta_servicetype);
 488                 mesh->catta_servicetype = NULL;
 489         }
 490
 491         return NULL;
 492 }
 493
 494 #if defined(__linux)
 495 static void netlink_io_handler(event_loop_t *loop, void *data, int flags) {
 496         (void)flags;
 497         static time_t prev_update;
 498         meshlink_handle_t *mesh = data;
 499
 500         struct {
 501                 struct nlmsghdr nlm;
 502                 char data[2048];
 503         } msg;
 504
 505         while(true) {
 506                 ssize_t result = recv(mesh->pfroute_io.fd, &msg, sizeof(msg), MSG_DONTWAIT);
 507
 508                 if(result <= 0) {
 509                         if(result == 0 || errno == EAGAIN || errno == EINTR) {
 510                                 break;
 511                         }
 512
 513                         logger(mesh, MESHLINK_ERROR, "Reading from Netlink socket failed: %s\n", strerror(errno));
 514                         io_set(loop, &mesh->pfroute_io, 0);
 515                 }
 516
 517                 if((size_t)result < sizeof(msg.nlm)) {
 518                         logger(mesh, MESHLINK_ERROR, "Invalid Netlink message\n");
 519                         break;
 520                 }
 521
 522                 switch(msg.nlm.nlmsg_type) {
 523                 case RTM_NEWLINK:
 524                 case RTM_DELLINK:
 525                 case RTM_NEWADDR:
 526                 case RTM_DELADDR:
 527                         if(loop->now.tv_sec > prev_update + 5) {
 528                                 prev_update = loop->now.tv_sec;
 529                                 handle_network_change(mesh, 1);
 530                         }
 531
 532                         break;
 533
 534                 default:
 535                         break;
 536                 }
 537         }
 538 }
 539 #elif defined(RTM_NEWADDR)
 540 static void pfroute_io_handler(event_loop_t *loop, void *data, int flags) {
 541         (void)flags;
 542         static time_t prev_update;
 543         meshlink_handle_t *mesh = data;
 544
 545         struct {
 546                 struct rt_msghdr rtm;
 547                 char data[2048];
 548         } msg;
 549
 550         while(true) {
 551                 msg.rtm.rtm_version = 0;
 552                 ssize_t result = recv(mesh->pfroute_io.fd, &msg, sizeof(msg), MSG_DONTWAIT);
 553
 554                 if(result <= 0) {
 555                         if(result == 0 || errno == EAGAIN || errno == EINTR) {
 556                                 break;
 557                         }
 558
 559                         logger(mesh, MESHLINK_ERROR, "Reading from PFROUTE socket failed: %s\n", strerror(errno));
 560                         io_set(loop, &mesh->pfroute_io, 0);
 561                 }
 562
 563                 if(msg.rtm.rtm_version != RTM_VERSION) {
 564                         logger(mesh, MESHLINK_ERROR, "Invalid PFROUTE message version\n");
 565                         break;
 566                 }
 567
 568                 switch(msg.rtm.rtm_type) {
 569                 case RTM_IFINFO:
 570                 case RTM_NEWADDR:
 571                 case RTM_DELADDR:
 572                         if(loop->now.tv_sec > prev_update + 5) {
 573                                 prev_update = loop->now.tv_sec;
 574                                 handle_network_change(mesh, 1);
 575                         }
 576
 577                         break;
 578
 579                 default:
 580                         break;
 581                 }
 582         }
 583 }
 584 #endif
 585
 586 bool discovery_start(meshlink_handle_t *mesh) {
 587         logger(mesh, MESHLINK_DEBUG, "discovery_start called\n");
 588
 589         assert(mesh);
 590         assert(!mesh->catta_poll);
 591         assert(!mesh->catta_server);
 592         assert(!mesh->catta_browser);
 593         assert(!mesh->discovery_threadstarted);
 594         assert(!mesh->catta_servicetype);
 595
 596         if(pthread_mutex_lock(&mesh->discovery_mutex) != 0) {
 597                 abort();
 598         }
 599
 600         // Start the discovery thread
 601         if(pthread_create(&mesh->discovery_thread, NULL, discovery_loop, mesh) != 0) {
 602                 pthread_mutex_unlock(&mesh->discovery_mutex);
 603                 logger(mesh, MESHLINK_ERROR, "Could not start discovery thread: %s\n", strerror(errno));
 604                 memset(&mesh->discovery_thread, 0, sizeof(mesh)->discovery_thread);
 605                 return false;
 606         }
 607
 608         pthread_cond_wait(&mesh->discovery_cond, &mesh->discovery_mutex);
 609         pthread_mutex_unlock(&mesh->discovery_mutex);
 610
 611         mesh->discovery_threadstarted = true;
 612
 613 #if defined(__linux)
 614         int sock = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
 615
 616         if(sock != -1) {
 617                 struct sockaddr_nl sa;
 618                 memset(&sa, 0, sizeof(sa));
 619                 sa.nl_family = AF_NETLINK;
 620                 sa.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV6_IFADDR;
 621
 622                 if(bind(sock, (struct sockaddr *)&sa, sizeof(sa)) != -1) {
 623                         io_add(&mesh->loop, &mesh->pfroute_io, netlink_io_handler, mesh, sock, IO_READ);
 624                 } else {
 625                         logger(mesh, MESHLINK_WARNING, "Could not bind AF_NETLINK socket: %s", strerror(errno));
 626                 }
 627         } else {
 628                 logger(mesh, MESHLINK_WARNING, "Could not open AF_NETLINK socket: %s", strerror(errno));
 629         }
 630
 631 #elif defined(RTM_NEWADDR)
 632         int sock = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC);
 633
 634         if(sock != -1) {
 635                 io_add(&mesh->loop, &mesh->pfroute_io, pfroute_io_handler, mesh, sock, IO_READ);
 636         } else {
 637                 logger(mesh, MESHLINK_WARNING, "Could not open PF_ROUTE socket: %s", strerror(errno));
 638         }
 639
 640 #endif
 641
 642         return true;
 643 }
 644
 645 void discovery_stop(meshlink_handle_t *mesh) {
 646         logger(mesh, MESHLINK_DEBUG, "discovery_stop called\n");
 647
 648         assert(mesh);
 649
 650         if(mesh->pfroute_io.cb) {
 651                 close(mesh->pfroute_io.fd);
 652                 io_del(&mesh->loop, &mesh->pfroute_io);
 653         }
 654
 655         // Shut down
 656         if(mesh->catta_poll) {
 657                 catta_simple_poll_quit(mesh->catta_poll);
 658         }
 659
 660         // Wait for the discovery thread to finish
 661         if(mesh->discovery_threadstarted == true) {
 662                 if(pthread_join(mesh->discovery_thread, NULL) != 0) {
 663                         abort();
 664                 }
 665
 666                 mesh->discovery_threadstarted = false;
 667         }
 668
 669         mesh->catta_interfaces = 0;
 670 }