git.meshlink.io Git - catta/blob - avahi-compat-libdns_sd/compat.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of avahi.
   5
   6   avahi is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as
   8   published by the Free Software Foundation; either version 2.1 of the
   9   License, or (at your option) any later version.
  10
  11   avahi is distributed in the hope that it will be useful, but WITHOUT
  12   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13   or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
  14   Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public
  17   License along with avahi; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <pthread.h>
  27 #include <assert.h>
  28 #include <unistd.h>
  29 #include <stdio.h>
  30 #include <errno.h>
  31 #include <string.h>
  32 #include <signal.h>
  33 #include <netinet/in.h>
  34
  35 #include <avahi-common/simple-watch.h>
  36 #include <avahi-common/malloc.h>
  37 #include <avahi-common/error.h>
  38 #include <avahi-common/domain.h>
  39 #include <avahi-common/alternative.h>
  40 #include <avahi-client/client.h>
  41
  42 #include "warn.h"
  43 #include "dns_sd.h"
  44
  45 enum {
  46     COMMAND_POLL = 'P',
  47     COMMAND_QUIT = 'Q',
  48     COMMAND_POLLED = 'D'
  49 };
  50
  51 struct _DNSServiceRef_t {
  52     int n_ref;
  53
  54     AvahiSimplePoll *simple_poll;
  55
  56     int thread_fd, main_fd;
  57
  58     pthread_t thread;
  59     int thread_running;
  60
  61     pthread_mutex_t mutex;
  62
  63     void *context;
  64     DNSServiceBrowseReply service_browser_callback;
  65     DNSServiceResolveReply service_resolver_callback;
  66     DNSServiceDomainEnumReply domain_browser_callback;
  67     DNSServiceRegisterReply service_register_callback;
  68
  69     AvahiClient *client;
  70     AvahiServiceBrowser *service_browser;
  71     AvahiServiceResolver *service_resolver;
  72     AvahiDomainBrowser *domain_browser;
  73
  74     char *service_name, *service_name_chosen, *service_regtype, *service_domain, *service_host;
  75     uint16_t service_port;
  76     AvahiIfIndex service_interface;
  77     AvahiStringList *service_txt;
  78
  79     AvahiEntryGroup *entry_group;
  80 };
  81
  82 #define ASSERT_SUCCESS(r) { int __ret = (r); assert(__ret == 0); }
  83
  84 static DNSServiceErrorType map_error(int error) {
  85     switch (error) {
  86         case AVAHI_OK :
  87             return kDNSServiceErr_NoError;
  88
  89         case AVAHI_ERR_BAD_STATE :
  90             return kDNSServiceErr_BadState;
  91
  92         case AVAHI_ERR_INVALID_HOST_NAME:
  93         case AVAHI_ERR_INVALID_DOMAIN_NAME:
  94         case AVAHI_ERR_INVALID_TTL:
  95         case AVAHI_ERR_IS_PATTERN:
  96         case AVAHI_ERR_INVALID_RECORD:
  97         case AVAHI_ERR_INVALID_SERVICE_NAME:
  98         case AVAHI_ERR_INVALID_SERVICE_TYPE:
  99         case AVAHI_ERR_INVALID_PORT:
 100         case AVAHI_ERR_INVALID_KEY:
 101         case AVAHI_ERR_INVALID_ADDRESS:
 102         case AVAHI_ERR_INVALID_SERVICE_SUBTYPE:
 103             return kDNSServiceErr_BadParam;
 104
 105
 106         case AVAHI_ERR_LOCAL_COLLISION:
 107             return kDNSServiceErr_NameConflict;
 108
 109         case AVAHI_ERR_TOO_MANY_CLIENTS:
 110         case AVAHI_ERR_TOO_MANY_OBJECTS:
 111         case AVAHI_ERR_TOO_MANY_ENTRIES:
 112         case AVAHI_ERR_ACCESS_DENIED:
 113             return kDNSServiceErr_Refused;
 114
 115         case AVAHI_ERR_INVALID_OPERATION:
 116         case AVAHI_ERR_INVALID_OBJECT:
 117             return kDNSServiceErr_Invalid;
 118
 119         case AVAHI_ERR_NO_MEMORY:
 120             return kDNSServiceErr_NoMemory;
 121
 122         case AVAHI_ERR_INVALID_INTERFACE:
 123         case AVAHI_ERR_INVALID_PROTOCOL:
 124             return kDNSServiceErr_BadInterfaceIndex;
 125
 126         case AVAHI_ERR_INVALID_FLAGS:
 127             return kDNSServiceErr_BadFlags;
 128
 129         case AVAHI_ERR_NOT_FOUND:
 130             return kDNSServiceErr_NoSuchName;
 131
 132         case AVAHI_ERR_VERSION_MISMATCH:
 133             return kDNSServiceErr_Incompatible;
 134
 135         case AVAHI_ERR_NO_NETWORK:
 136         case AVAHI_ERR_OS:
 137         case AVAHI_ERR_INVALID_CONFIG:
 138         case AVAHI_ERR_TIMEOUT:
 139         case AVAHI_ERR_DBUS_ERROR:
 140         case AVAHI_ERR_NOT_CONNECTED:
 141         case AVAHI_ERR_NO_DAEMON:
 142             break;
 143
 144     }
 145
 146     return kDNSServiceErr_Unknown;
 147 }
 148
 149 static const char *add_trailing_dot(const char *s, char *buf, size_t buf_len) {
 150     if (!s)
 151         return NULL;
 152
 153     if (*s == 0)
 154         return s;
 155
 156     if (s[strlen(s)-1] == '.')
 157         return s;
 158
 159     snprintf(buf, buf_len, "%s.", s);
 160     return buf;
 161 }
 162
 163 static int read_command(int fd) {
 164     ssize_t r;
 165     char command;
 166
 167     assert(fd >= 0);
 168
 169     if ((r = read(fd, &command, 1)) != 1) {
 170         fprintf(stderr, __FILE__": read() failed: %s\n", r < 0 ? strerror(errno) : "EOF");
 171         return -1;
 172     }
 173
 174     return command;
 175 }
 176
 177 static int write_command(int fd, char reply) {
 178     assert(fd >= 0);
 179
 180     if (write(fd, &reply, 1) != 1) {
 181         fprintf(stderr, __FILE__": write() failed: %s\n", strerror(errno));
 182         return -1;
 183     }
 184
 185     return 0;
 186 }
 187
 188 static int poll_func(struct pollfd *ufds, unsigned int nfds, int timeout, void *userdata) {
 189     DNSServiceRef sdref = userdata;
 190     int ret;
 191
 192     assert(sdref);
 193
 194     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 195
 196 /*     fprintf(stderr, "pre-syscall\n"); */
 197     ret = poll(ufds, nfds, timeout);
 198 /*     fprintf(stderr, "post-syscall\n"); */
 199
 200     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 201
 202     return ret;
 203 }
 204
 205 static void * thread_func(void *data) {
 206     DNSServiceRef sdref = data;
 207     sigset_t mask;
 208
 209     sigfillset(&mask);
 210     pthread_sigmask(SIG_BLOCK, &mask, NULL);
 211
 212     sdref->thread = pthread_self();
 213     sdref->thread_running = 1;
 214
 215     for (;;) {
 216         char command;
 217
 218         if ((command = read_command(sdref->thread_fd)) < 0)
 219             break;
 220
 221 /*         fprintf(stderr, "Command: %c\n", command); */
 222
 223         switch (command) {
 224
 225             case COMMAND_POLL:
 226
 227                 ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 228
 229
 230                 if (avahi_simple_poll_run(sdref->simple_poll) < 0) {
 231                     fprintf(stderr, __FILE__": avahi_simple_poll_run() failed.\n");
 232                     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 233                     break;
 234                 }
 235
 236                 if (write_command(sdref->thread_fd, COMMAND_POLLED) < 0) {
 237                     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 238                     break;
 239                 }
 240
 241                 ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 242
 243                 break;
 244
 245             case COMMAND_QUIT:
 246                 return NULL;
 247         }
 248
 249     }
 250
 251     return NULL;
 252 }
 253
 254 static DNSServiceRef sdref_new(void) {
 255     int fd[2] = { -1, -1 };
 256     DNSServiceRef sdref = NULL;
 257     pthread_mutexattr_t mutex_attr;
 258
 259     if (socketpair(AF_UNIX, SOCK_STREAM, 0, fd) < 0)
 260         goto fail;
 261
 262     if (!(sdref = avahi_new(struct _DNSServiceRef_t, 1)))
 263         goto fail;
 264
 265     sdref->n_ref = 1;
 266     sdref->thread_fd = fd[0];
 267     sdref->main_fd = fd[1];
 268
 269     sdref->client = NULL;
 270     sdref->service_browser = NULL;
 271     sdref->service_resolver = NULL;
 272     sdref->domain_browser = NULL;
 273     sdref->entry_group = NULL;
 274
 275     sdref->service_name = sdref->service_name_chosen = sdref->service_regtype = sdref->service_domain = sdref->service_host = NULL;
 276     sdref->service_txt = NULL;
 277
 278     ASSERT_SUCCESS(pthread_mutexattr_init(&mutex_attr));
 279     pthread_mutexattr_settype(&mutex_attr, PTHREAD_MUTEX_RECURSIVE);
 280     ASSERT_SUCCESS(pthread_mutex_init(&sdref->mutex, NULL));
 281
 282     sdref->thread_running = 0;
 283
 284     if (!(sdref->simple_poll = avahi_simple_poll_new()))
 285         goto fail;
 286
 287     avahi_simple_poll_set_func(sdref->simple_poll, poll_func, sdref);
 288
 289     /* Start simple poll */
 290     if (avahi_simple_poll_prepare(sdref->simple_poll, -1) < 0)
 291         goto fail;
 292
 293     /* Queue a initiall POLL command for the thread */
 294     if (write_command(sdref->main_fd, COMMAND_POLL) < 0)
 295         goto fail;
 296
 297     if (pthread_create(&sdref->thread, NULL, thread_func, sdref) != 0)
 298         goto fail;
 299
 300     sdref->thread_running = 1;
 301
 302     return sdref;
 303
 304 fail:
 305
 306     if (sdref)
 307         DNSServiceRefDeallocate(sdref);
 308
 309     return NULL;
 310 }
 311
 312 static void sdref_free(DNSServiceRef sdref) {
 313     assert(sdref);
 314
 315     if (sdref->thread_running) {
 316         write_command(sdref->main_fd, COMMAND_QUIT);
 317         avahi_simple_poll_wakeup(sdref->simple_poll);
 318         pthread_join(sdref->thread, NULL);
 319     }
 320
 321     if (sdref->client)
 322         avahi_client_free(sdref->client);
 323
 324     if (sdref->thread_fd >= 0)
 325         close(sdref->thread_fd);
 326
 327     if (sdref->main_fd >= 0)
 328         close(sdref->main_fd);
 329
 330     if (sdref->simple_poll)
 331         avahi_simple_poll_free(sdref->simple_poll);
 332
 333     pthread_mutex_destroy(&sdref->mutex);
 334
 335     avahi_free(sdref->service_name);
 336     avahi_free(sdref->service_name_chosen);
 337     avahi_free(sdref->service_regtype);
 338     avahi_free(sdref->service_domain);
 339     avahi_free(sdref->service_host);
 340
 341     avahi_string_list_free(sdref->service_txt);
 342
 343     avahi_free(sdref);
 344 }
 345
 346 static void sdref_ref(DNSServiceRef sdref) {
 347     assert(sdref);
 348     assert(sdref->n_ref >= 1);
 349
 350     sdref->n_ref++;
 351 }
 352
 353 static void sdref_unref(DNSServiceRef sdref) {
 354     assert(sdref);
 355     assert(sdref->n_ref >= 1);
 356
 357     if (--(sdref->n_ref) <= 0)
 358         sdref_free(sdref);
 359 }
 360
 361 int DNSSD_API DNSServiceRefSockFD(DNSServiceRef sdref) {
 362     assert(sdref);
 363     assert(sdref->n_ref >= 1);
 364
 365     AVAHI_WARN_LINKAGE;
 366
 367     return sdref->main_fd;
 368 }
 369
 370 DNSServiceErrorType DNSSD_API DNSServiceProcessResult(DNSServiceRef sdref) {
 371     DNSServiceErrorType ret = kDNSServiceErr_Unknown;
 372
 373     assert(sdref);
 374     assert(sdref->n_ref >= 1);
 375
 376     AVAHI_WARN_LINKAGE;
 377
 378     sdref_ref(sdref);
 379
 380     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 381
 382     /* Cleanup notification socket */
 383     if (read_command(sdref->main_fd) != COMMAND_POLLED)
 384         goto finish;
 385
 386     if (avahi_simple_poll_dispatch(sdref->simple_poll) < 0)
 387         goto finish;
 388
 389     if (sdref->n_ref > 1) /* Perhaps we should die */
 390
 391         /* Dispatch events */
 392         if (avahi_simple_poll_prepare(sdref->simple_poll, -1) < 0)
 393             goto finish;
 394
 395     if (sdref->n_ref > 1)
 396
 397         /* Request the poll */
 398         if (write_command(sdref->main_fd, COMMAND_POLL) < 0)
 399             goto finish;
 400
 401     ret = kDNSServiceErr_NoError;
 402
 403 finish:
 404
 405     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 406
 407     sdref_unref(sdref);
 408
 409     return ret;
 410 }
 411
 412 void DNSSD_API DNSServiceRefDeallocate(DNSServiceRef sdref) {
 413     assert(sdref);
 414     assert(sdref->n_ref >= 1);
 415
 416     AVAHI_WARN_LINKAGE;
 417
 418     sdref_unref(sdref);
 419 }
 420
 421 static void service_browser_callback(
 422     AvahiServiceBrowser *b,
 423     AvahiIfIndex interface,
 424     AvahiProtocol protocol,
 425     AvahiBrowserEvent event,
 426     const char *name,
 427     const char *type,
 428     const char *domain,
 429     AvahiLookupResultFlags flags,
 430     void *userdata) {
 431
 432     DNSServiceRef sdref = userdata;
 433     char type_fixed[AVAHI_DOMAIN_NAME_MAX], domain_fixed[AVAHI_DOMAIN_NAME_MAX];
 434     assert(b);
 435     assert(sdref);
 436     assert(sdref->n_ref >= 1);
 437
 438     type = add_trailing_dot(type, type_fixed, sizeof(type_fixed));
 439     domain  = add_trailing_dot(domain, domain_fixed, sizeof(domain_fixed));
 440
 441     switch (event) {
 442         case AVAHI_BROWSER_NEW:
 443             sdref->service_browser_callback(sdref, kDNSServiceFlagsAdd, interface, kDNSServiceErr_NoError, name, type, domain, sdref->context);
 444             break;
 445
 446         case AVAHI_BROWSER_REMOVE:
 447             sdref->service_browser_callback(sdref, 0, interface, kDNSServiceErr_NoError, name, type, domain, sdref->context);
 448             break;
 449
 450         case AVAHI_BROWSER_FAILURE:
 451             sdref->service_browser_callback(sdref, 0, interface, map_error(avahi_client_errno(sdref->client)), NULL, NULL, NULL, sdref->context);
 452             break;
 453
 454         case AVAHI_BROWSER_CACHE_EXHAUSTED:
 455         case AVAHI_BROWSER_ALL_FOR_NOW:
 456             break;
 457     }
 458 }
 459
 460 static void generic_client_callback(AvahiClient *s, AvahiClientState state, void* userdata) {
 461     DNSServiceRef sdref = userdata;
 462
 463     assert(s);
 464     assert(sdref);
 465     assert(sdref->n_ref >= 1);
 466
 467     switch (state) {
 468         case AVAHI_CLIENT_DISCONNECTED: {
 469
 470             if (sdref->service_browser_callback)
 471                 sdref->service_browser_callback(sdref, 0, 0, kDNSServiceErr_Unknown, NULL, NULL, NULL, sdref->context);
 472             else if (sdref->service_resolver_callback)
 473                 sdref->service_resolver_callback(sdref, 0, 0, kDNSServiceErr_Unknown, NULL, NULL, 0, 0, NULL, sdref->context);
 474             else if (sdref->domain_browser_callback)
 475                 sdref->domain_browser_callback(sdref, 0, 0, kDNSServiceErr_Unknown, NULL, sdref->context);
 476
 477             break;
 478         }
 479
 480         case AVAHI_CLIENT_S_RUNNING:
 481         case AVAHI_CLIENT_S_COLLISION:
 482         case AVAHI_CLIENT_S_INVALID:
 483         case AVAHI_CLIENT_S_REGISTERING:
 484             break;
 485     }
 486 }
 487
 488 DNSServiceErrorType DNSSD_API DNSServiceBrowse(
 489     DNSServiceRef *ret_sdref,
 490     DNSServiceFlags flags,
 491     uint32_t interface,
 492     const char *regtype,
 493     const char *domain,
 494     DNSServiceBrowseReply callback,
 495     void *context) {
 496
 497     DNSServiceErrorType ret = kDNSServiceErr_Unknown;
 498     int error;
 499     DNSServiceRef sdref = NULL;
 500     AvahiIfIndex ifindex;
 501
 502     AVAHI_WARN_LINKAGE;
 503
 504     assert(ret_sdref);
 505     assert(regtype);
 506     assert(domain);
 507     assert(callback);
 508
 509     if (interface == kDNSServiceInterfaceIndexLocalOnly || flags != 0) {
 510         AVAHI_WARN_UNSUPPORTED;
 511         return kDNSServiceErr_Unsupported;
 512     }
 513
 514     if (!(sdref = sdref_new()))
 515         return kDNSServiceErr_Unknown;
 516
 517     sdref->context = context;
 518     sdref->service_browser_callback = callback;
 519
 520     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 521
 522     if (!(sdref->client = avahi_client_new(avahi_simple_poll_get(sdref->simple_poll), generic_client_callback, sdref, &error))) {
 523         ret =  map_error(error);
 524         goto finish;
 525     }
 526
 527     ifindex = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
 528
 529     if (!(sdref->service_browser = avahi_service_browser_new(sdref->client, ifindex, AVAHI_PROTO_UNSPEC, regtype, domain, 0, service_browser_callback, sdref))) {
 530         ret = map_error(avahi_client_errno(sdref->client));
 531         goto finish;
 532     }
 533
 534     ret = kDNSServiceErr_NoError;
 535     *ret_sdref = sdref;
 536
 537 finish:
 538
 539     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 540
 541     if (ret != kDNSServiceErr_NoError)
 542         DNSServiceRefDeallocate(sdref);
 543
 544     return ret;
 545 }
 546
 547 static void service_resolver_callback(
 548     AvahiServiceResolver *r,
 549     AvahiIfIndex interface,
 550     AvahiProtocol protocol,
 551     AvahiResolverEvent event,
 552     const char *name,
 553     const char *type,
 554     const char *domain,
 555     const char *host_name,
 556     const AvahiAddress *a,
 557     uint16_t port,
 558     AvahiStringList *txt,
 559     AvahiLookupResultFlags flags,
 560     void *userdata) {
 561
 562     DNSServiceRef sdref = userdata;
 563     char host_name_fixed[AVAHI_DOMAIN_NAME_MAX];
 564
 565     assert(r);
 566     assert(sdref);
 567     assert(sdref->n_ref >= 1);
 568
 569     host_name = add_trailing_dot(host_name, host_name_fixed, sizeof(host_name_fixed));
 570
 571     switch (event) {
 572         case AVAHI_RESOLVER_FOUND: {
 573
 574             char full_name[AVAHI_DOMAIN_NAME_MAX];
 575             int ret;
 576             char *p = NULL;
 577             size_t l = 0;
 578
 579             if ((p = avahi_new0(char, (l = avahi_string_list_serialize(txt, NULL, 0))+1)))
 580                 avahi_string_list_serialize(txt, p, l);
 581
 582             ret = avahi_service_name_join(full_name, sizeof(full_name), name, type, domain);
 583             assert(ret == AVAHI_OK);
 584
 585             strcat(full_name, ".");
 586
 587             sdref->service_resolver_callback(sdref, 0, interface, kDNSServiceErr_NoError, full_name, host_name, htons(port), l, p, sdref->context);
 588
 589             avahi_free(p);
 590             break;
 591         }
 592
 593         case AVAHI_RESOLVER_FAILURE:
 594             sdref->service_resolver_callback(sdref, 0, interface, map_error(avahi_client_errno(sdref->client)), NULL, NULL, 0, 0, NULL, sdref->context);
 595
 596     }
 597 }
 598
 599 DNSServiceErrorType DNSSD_API DNSServiceResolve(
 600     DNSServiceRef *ret_sdref,
 601     DNSServiceFlags flags,
 602     uint32_t interface,
 603     const char *name,
 604     const char *regtype,
 605     const char *domain,
 606     DNSServiceResolveReply callback,
 607     void *context) {
 608
 609     DNSServiceErrorType ret = kDNSServiceErr_Unknown;
 610     int error;
 611     DNSServiceRef sdref = NULL;
 612     AvahiIfIndex ifindex;
 613
 614     AVAHI_WARN_LINKAGE;
 615
 616     assert(ret_sdref);
 617     assert(name);
 618     assert(regtype);
 619     assert(domain);
 620     assert(callback);
 621
 622     if (interface == kDNSServiceInterfaceIndexLocalOnly || flags != 0) {
 623         AVAHI_WARN_UNSUPPORTED;
 624         return kDNSServiceErr_Unsupported;
 625     }
 626
 627     if (!(sdref = sdref_new()))
 628         return kDNSServiceErr_Unknown;
 629
 630     sdref->context = context;
 631     sdref->service_resolver_callback = callback;
 632
 633     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 634
 635     if (!(sdref->client = avahi_client_new(avahi_simple_poll_get(sdref->simple_poll), generic_client_callback, sdref, &error))) {
 636         ret =  map_error(error);
 637         goto finish;
 638     }
 639
 640     ifindex = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
 641
 642     if (!(sdref->service_resolver = avahi_service_resolver_new(sdref->client, ifindex, AVAHI_PROTO_UNSPEC, name, regtype, domain, AVAHI_PROTO_UNSPEC, 0, service_resolver_callback, sdref))) {
 643         ret = map_error(avahi_client_errno(sdref->client));
 644         goto finish;
 645     }
 646
 647
 648     ret = kDNSServiceErr_NoError;
 649     *ret_sdref = sdref;
 650
 651 finish:
 652
 653     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 654
 655     if (ret != kDNSServiceErr_NoError)
 656         DNSServiceRefDeallocate(sdref);
 657
 658     return ret;
 659 }
 660
 661 int DNSSD_API DNSServiceConstructFullName (
 662     char *fullName,
 663     const char *service,
 664     const char *regtype,
 665     const char *domain) {
 666
 667     AVAHI_WARN_LINKAGE;
 668
 669     assert(fullName);
 670     assert(regtype);
 671     assert(domain);
 672
 673     if (avahi_service_name_join(fullName, kDNSServiceMaxDomainName, service, regtype, domain) < 0)
 674         return -1;
 675
 676     return 0;
 677 }
 678
 679 static void domain_browser_callback(
 680     AvahiDomainBrowser *b,
 681     AvahiIfIndex interface,
 682     AvahiProtocol protocol,
 683     AvahiBrowserEvent event,
 684     const char *domain,
 685     AvahiLookupResultFlags flags,
 686     void *userdata) {
 687
 688     DNSServiceRef sdref = userdata;
 689     static char domain_fixed[AVAHI_DOMAIN_NAME_MAX];
 690
 691     assert(b);
 692     assert(sdref);
 693     assert(sdref->n_ref >= 1);
 694
 695     domain  = add_trailing_dot(domain, domain_fixed, sizeof(domain_fixed));
 696
 697     switch (event) {
 698         case AVAHI_BROWSER_NEW:
 699             sdref->domain_browser_callback(sdref, kDNSServiceFlagsAdd, interface, kDNSServiceErr_NoError, domain, sdref->context);
 700             break;
 701
 702         case AVAHI_BROWSER_REMOVE:
 703             sdref->domain_browser_callback(sdref, 0, interface, kDNSServiceErr_NoError, domain, sdref->context);
 704             break;
 705
 706         case AVAHI_BROWSER_FAILURE:
 707             sdref->domain_browser_callback(sdref, 0, interface, map_error(avahi_client_errno(sdref->client)), domain, sdref->context);
 708             break;
 709
 710         case AVAHI_BROWSER_CACHE_EXHAUSTED:
 711         case AVAHI_BROWSER_ALL_FOR_NOW:
 712             break;
 713     }
 714 }
 715
 716 DNSServiceErrorType DNSSD_API DNSServiceEnumerateDomains(
 717     DNSServiceRef *ret_sdref,
 718     DNSServiceFlags flags,
 719     uint32_t interface,
 720     DNSServiceDomainEnumReply callback,
 721     void *context) {
 722
 723     DNSServiceErrorType ret = kDNSServiceErr_Unknown;
 724     int error;
 725     DNSServiceRef sdref = NULL;
 726     AvahiIfIndex ifindex;
 727
 728     AVAHI_WARN_LINKAGE;
 729
 730     assert(ret_sdref);
 731     assert(callback);
 732
 733     if (interface == kDNSServiceInterfaceIndexLocalOnly ||
 734         (flags != kDNSServiceFlagsBrowseDomains &&  flags != kDNSServiceFlagsRegistrationDomains)) {
 735         AVAHI_WARN_UNSUPPORTED;
 736         return kDNSServiceErr_Unsupported;
 737     }
 738
 739     if (!(sdref = sdref_new()))
 740         return kDNSServiceErr_Unknown;
 741
 742     sdref->context = context;
 743     sdref->domain_browser_callback = callback;
 744
 745     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 746
 747     if (!(sdref->client = avahi_client_new(avahi_simple_poll_get(sdref->simple_poll), generic_client_callback, sdref, &error))) {
 748         ret =  map_error(error);
 749         goto finish;
 750     }
 751
 752     ifindex = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
 753
 754     if (!(sdref->domain_browser = avahi_domain_browser_new(sdref->client, ifindex, AVAHI_PROTO_UNSPEC, "local",
 755                                                            flags == kDNSServiceFlagsRegistrationDomains ? AVAHI_DOMAIN_BROWSER_REGISTER : AVAHI_DOMAIN_BROWSER_BROWSE,
 756                                                            0, domain_browser_callback, sdref))) {
 757         ret = map_error(avahi_client_errno(sdref->client));
 758         goto finish;
 759     }
 760
 761     ret = kDNSServiceErr_NoError;
 762     *ret_sdref = sdref;
 763
 764 finish:
 765
 766     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 767
 768     if (ret != kDNSServiceErr_NoError)
 769         DNSServiceRefDeallocate(sdref);
 770
 771     return ret;
 772 }
 773
 774 static void reg_report_error(DNSServiceRef sdref, DNSServiceErrorType error) {
 775     char regtype_fixed[AVAHI_DOMAIN_NAME_MAX], domain_fixed[AVAHI_DOMAIN_NAME_MAX];
 776     const char *regtype, *domain;
 777     assert(sdref);
 778     assert(sdref->n_ref >= 1);
 779
 780     assert(sdref->service_register_callback);
 781
 782     regtype = add_trailing_dot(sdref->service_regtype, regtype_fixed, sizeof(regtype_fixed));
 783     domain = add_trailing_dot(sdref->service_domain, domain_fixed, sizeof(domain_fixed));
 784
 785     sdref->service_register_callback(
 786         sdref, 0, error,
 787         sdref->service_name_chosen ? sdref->service_name_chosen : sdref->service_name,
 788         regtype,
 789         domain,
 790         sdref->context);
 791 }
 792
 793 static int reg_create_service(DNSServiceRef sdref) {
 794     int ret;
 795     const char *real_type;
 796
 797     assert(sdref);
 798     assert(sdref->n_ref >= 1);
 799
 800     real_type = avahi_get_type_from_subtype(sdref->service_regtype);
 801
 802     if ((ret = avahi_entry_group_add_service_strlst(
 803         sdref->entry_group,
 804         sdref->service_interface,
 805         AVAHI_PROTO_UNSPEC,
 806         0,
 807         sdref->service_name_chosen,
 808         real_type ? real_type : sdref->service_regtype,
 809         sdref->service_domain,
 810         sdref->service_host,
 811         sdref->service_port,
 812         sdref->service_txt)) < 0)
 813         return ret;
 814
 815
 816     if (real_type) {
 817         /* Create a subtype entry */
 818
 819         if (avahi_entry_group_add_service_subtype(
 820                 sdref->entry_group,
 821                 sdref->service_interface,
 822                 AVAHI_PROTO_UNSPEC,
 823                 0,
 824                 sdref->service_name_chosen,
 825                 real_type,
 826                 sdref->service_domain,
 827                 sdref->service_regtype) < 0)
 828             return ret;
 829
 830     }
 831
 832     if ((ret = avahi_entry_group_commit(sdref->entry_group)) < 0)
 833         return ret;
 834
 835     return 0;
 836 }
 837
 838 static void reg_client_callback(AvahiClient *s, AvahiClientState state, void* userdata) {
 839     DNSServiceRef sdref = userdata;
 840
 841     assert(s);
 842     assert(sdref);
 843     assert(sdref->n_ref >= 1);
 844
 845     /* We've not been setup completely */
 846     if (!sdref->entry_group)
 847         return;
 848
 849     switch (state) {
 850         case AVAHI_CLIENT_DISCONNECTED: {
 851
 852             reg_report_error(sdref, kDNSServiceErr_NoError);
 853             break;
 854         }
 855
 856         case AVAHI_CLIENT_S_RUNNING: {
 857             int ret;
 858
 859             if (!sdref->service_name) {
 860                 const char *n;
 861                 /* If the service name is taken from the host name, copy that */
 862
 863                 avahi_free(sdref->service_name_chosen);
 864
 865                 if (!(n = avahi_client_get_host_name(sdref->client))) {
 866                     reg_report_error(sdref, map_error(avahi_client_errno(sdref->client)));
 867                     return;
 868                 }
 869
 870                 if (!(sdref->service_name_chosen = avahi_strdup(n))) {
 871                     reg_report_error(sdref, kDNSServiceErr_NoMemory);
 872                     return;
 873                 }
 874             }
 875
 876             /* Register the service */
 877
 878             if ((ret = reg_create_service(sdref)) < 0) {
 879                 reg_report_error(sdref, map_error(ret));
 880                 return;
 881             }
 882
 883             break;
 884         }
 885
 886         case AVAHI_CLIENT_S_COLLISION:
 887
 888             /* Remove our entry */
 889             avahi_entry_group_reset(sdref->entry_group);
 890
 891             break;
 892
 893         case AVAHI_CLIENT_S_INVALID:
 894         case AVAHI_CLIENT_S_REGISTERING:
 895             /* Ignore */
 896             break;
 897     }
 898
 899 }
 900
 901 static void reg_entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
 902     DNSServiceRef sdref = userdata;
 903
 904     assert(g);
 905
 906     switch (state) {
 907         case AVAHI_ENTRY_GROUP_ESTABLISHED:
 908             /* Inform the user */
 909             reg_report_error(sdref, kDNSServiceErr_NoError);
 910
 911             break;
 912
 913         case AVAHI_ENTRY_GROUP_COLLISION: {
 914             char *n;
 915             int ret;
 916
 917             /* Remove our entry */
 918             avahi_entry_group_reset(sdref->entry_group);
 919
 920             assert(sdref->service_name_chosen);
 921
 922             /* Pick a new name */
 923             if (!(n = avahi_alternative_service_name(sdref->service_name_chosen))) {
 924                 reg_report_error(sdref, kDNSServiceErr_NoMemory);
 925                 return;
 926             }
 927             avahi_free(sdref->service_name_chosen);
 928             sdref->service_name_chosen = n;
 929
 930             /* Register the service with that new name */
 931             if ((ret = reg_create_service(sdref)) < 0) {
 932                 reg_report_error(sdref, map_error(ret));
 933                 return;
 934             }
 935
 936             break;
 937         }
 938
 939         case AVAHI_ENTRY_GROUP_REGISTERING:
 940         case AVAHI_ENTRY_GROUP_UNCOMMITED:
 941             /* Ignore */
 942             break;
 943     }
 944 }
 945
 946 DNSServiceErrorType DNSSD_API DNSServiceRegister (
 947     DNSServiceRef *ret_sdref,
 948     DNSServiceFlags flags,
 949     uint32_t interface,
 950     const char *name,
 951     const char *regtype,
 952     const char *domain,
 953     const char *host,
 954     uint16_t port,
 955     uint16_t txtLen,
 956     const void *txtRecord,
 957     DNSServiceRegisterReply callback,
 958     void *context) {
 959
 960     DNSServiceErrorType ret = kDNSServiceErr_Unknown;
 961     int error;
 962     DNSServiceRef sdref = NULL;
 963
 964     AVAHI_WARN_LINKAGE;
 965
 966     assert(ret_sdref);
 967     assert(callback);
 968     assert(regtype);
 969
 970     if (interface == kDNSServiceInterfaceIndexLocalOnly || flags) {
 971         AVAHI_WARN_UNSUPPORTED;
 972         return kDNSServiceErr_Unsupported;
 973     }
 974
 975     if (!(sdref = sdref_new()))
 976         return kDNSServiceErr_Unknown;
 977
 978     sdref->context = context;
 979     sdref->service_register_callback = callback;
 980
 981     sdref->service_name = avahi_strdup(name);
 982     sdref->service_regtype = regtype ? avahi_normalize_name_strdup(regtype) : NULL;
 983     sdref->service_domain = domain ? avahi_normalize_name_strdup(domain) : NULL;
 984     sdref->service_host = host ? avahi_normalize_name_strdup(host) : NULL;
 985     sdref->service_interface = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
 986     sdref->service_port = ntohs(port);
 987     sdref->service_txt = txtRecord ? avahi_string_list_parse(txtRecord, txtLen) : NULL;
 988
 989     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 990
 991     if (!(sdref->client = avahi_client_new(avahi_simple_poll_get(sdref->simple_poll), reg_client_callback, sdref, &error))) {
 992         ret =  map_error(error);
 993         goto finish;
 994     }
 995
 996     if (!sdref->service_domain) {
 997         const char *d;
 998
 999         if (!(d = avahi_client_get_domain_name(sdref->client))) {
1000             ret = map_error(avahi_client_errno(sdref->client));
1001             goto finish;
1002         }
1003
1004         if (!(sdref->service_domain = avahi_strdup(d))) {
1005             ret = kDNSServiceErr_NoMemory;
1006             goto finish;
1007         }
1008     }
1009
1010     if (!(sdref->entry_group = avahi_entry_group_new(sdref->client, reg_entry_group_callback, sdref))) {
1011         ret = map_error(avahi_client_errno(sdref->client));
1012         goto finish;
1013     }
1014
1015     if (avahi_client_get_state(sdref->client) == AVAHI_CLIENT_S_RUNNING) {
1016         const char *n;
1017
1018         if (sdref->service_name)
1019             n = sdref->service_name;
1020         else {
1021             if (!(n = avahi_client_get_host_name(sdref->client))) {
1022                 ret = map_error(avahi_client_errno(sdref->client));
1023                 goto finish;
1024             }
1025         }
1026
1027         if (!(sdref->service_name_chosen = avahi_strdup(n))) {
1028             ret = kDNSServiceErr_NoMemory;
1029             goto finish;
1030         }
1031
1032
1033         if ((error = reg_create_service(sdref)) < 0) {
1034             ret = map_error(error);
1035             goto finish;
1036         }
1037     }
1038
1039     ret = kDNSServiceErr_NoError;
1040     *ret_sdref = sdref;
1041
1042 finish:
1043
1044     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
1045
1046     if (ret != kDNSServiceErr_NoError)
1047         DNSServiceRefDeallocate(sdref);
1048
1049     return ret;
1050 }
1051