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 #include <fcntl.h>
  35
  36 #include <sys/types.h>
  37 #include <sys/socket.h>
  38
  39 #include <avahi-common/simple-watch.h>
  40 #include <avahi-common/malloc.h>
  41 #include <avahi-common/error.h>
  42 #include <avahi-common/domain.h>
  43 #include <avahi-common/alternative.h>
  44
  45 #include <avahi-client/client.h>
  46 #include <avahi-client/publish.h>
  47 #include <avahi-client/lookup.h>
  48
  49 #include "warn.h"
  50 #include "dns_sd.h"
  51
  52 enum {
  53     COMMAND_POLL = 'p',
  54     COMMAND_QUIT = 'q',
  55     COMMAND_POLL_DONE = 'P',
  56     COMMAND_POLL_FAILED = 'F'
  57 };
  58
  59 struct type_info {
  60     char *type;
  61     AvahiStringList *subtypes;
  62     int n_subtypes;
  63 };
  64
  65 struct _DNSServiceRef_t {
  66     int n_ref;
  67
  68     AvahiSimplePoll *simple_poll;
  69
  70     int thread_fd, main_fd;
  71
  72     pthread_t thread;
  73     int thread_running;
  74
  75     pthread_mutex_t mutex;
  76
  77     void *context;
  78     DNSServiceBrowseReply service_browser_callback;
  79     DNSServiceResolveReply service_resolver_callback;
  80     DNSServiceDomainEnumReply domain_browser_callback;
  81     DNSServiceRegisterReply service_register_callback;
  82
  83     AvahiClient *client;
  84     AvahiServiceBrowser *service_browser;
  85     AvahiServiceResolver *service_resolver;
  86     AvahiDomainBrowser *domain_browser;
  87
  88     struct type_info type_info;
  89     char *service_name, *service_name_chosen, *service_domain, *service_host;
  90     uint16_t service_port;
  91     AvahiIfIndex service_interface;
  92     AvahiStringList *service_txt;
  93
  94     AvahiEntryGroup *entry_group;
  95 };
  96
  97 #define ASSERT_SUCCESS(r) { int __ret = (r); assert(__ret == 0); }
  98
  99 static DNSServiceErrorType map_error(int error) {
 100     switch (error) {
 101         case AVAHI_OK :
 102             return kDNSServiceErr_NoError;
 103
 104         case AVAHI_ERR_BAD_STATE :
 105             return kDNSServiceErr_BadState;
 106
 107         case AVAHI_ERR_INVALID_HOST_NAME:
 108         case AVAHI_ERR_INVALID_DOMAIN_NAME:
 109         case AVAHI_ERR_INVALID_TTL:
 110         case AVAHI_ERR_IS_PATTERN:
 111         case AVAHI_ERR_INVALID_RECORD:
 112         case AVAHI_ERR_INVALID_SERVICE_NAME:
 113         case AVAHI_ERR_INVALID_SERVICE_TYPE:
 114         case AVAHI_ERR_INVALID_PORT:
 115         case AVAHI_ERR_INVALID_KEY:
 116         case AVAHI_ERR_INVALID_ADDRESS:
 117         case AVAHI_ERR_INVALID_SERVICE_SUBTYPE:
 118             return kDNSServiceErr_BadParam;
 119
 120
 121         case AVAHI_ERR_COLLISION:
 122             return kDNSServiceErr_NameConflict;
 123
 124         case AVAHI_ERR_TOO_MANY_CLIENTS:
 125         case AVAHI_ERR_TOO_MANY_OBJECTS:
 126         case AVAHI_ERR_TOO_MANY_ENTRIES:
 127         case AVAHI_ERR_ACCESS_DENIED:
 128             return kDNSServiceErr_Refused;
 129
 130         case AVAHI_ERR_INVALID_OPERATION:
 131         case AVAHI_ERR_INVALID_OBJECT:
 132             return kDNSServiceErr_Invalid;
 133
 134         case AVAHI_ERR_NO_MEMORY:
 135             return kDNSServiceErr_NoMemory;
 136
 137         case AVAHI_ERR_INVALID_INTERFACE:
 138         case AVAHI_ERR_INVALID_PROTOCOL:
 139             return kDNSServiceErr_BadInterfaceIndex;
 140
 141         case AVAHI_ERR_INVALID_FLAGS:
 142             return kDNSServiceErr_BadFlags;
 143
 144         case AVAHI_ERR_NOT_FOUND:
 145             return kDNSServiceErr_NoSuchName;
 146
 147         case AVAHI_ERR_VERSION_MISMATCH:
 148             return kDNSServiceErr_Incompatible;
 149
 150         case AVAHI_ERR_NO_NETWORK:
 151         case AVAHI_ERR_OS:
 152         case AVAHI_ERR_INVALID_CONFIG:
 153         case AVAHI_ERR_TIMEOUT:
 154         case AVAHI_ERR_DBUS_ERROR:
 155         case AVAHI_ERR_DISCONNECTED:
 156         case AVAHI_ERR_NO_DAEMON:
 157             break;
 158
 159     }
 160
 161     return kDNSServiceErr_Unknown;
 162 }
 163
 164 static void type_info_init(struct type_info *i) {
 165     assert(i);
 166     i->type = NULL;
 167     i->subtypes = NULL;
 168     i->n_subtypes = 0;
 169 }
 170
 171 static void type_info_free(struct type_info *i) {
 172     assert(i);
 173
 174     avahi_free(i->type);
 175     avahi_string_list_free(i->subtypes);
 176
 177     type_info_init(i);
 178 }
 179
 180 static int type_info_parse(struct type_info *i, const char *t) {
 181     char *token = NULL;
 182
 183     assert(i);
 184     assert(t);
 185
 186     type_info_init(i);
 187
 188     for (;;) {
 189         size_t l;
 190
 191         if (*t == 0)
 192             break;
 193
 194         l = strcspn(t, ",");
 195
 196         if (l <= 0)
 197             goto fail;
 198
 199         token = avahi_strndup(t, l);
 200
 201         if (!token)
 202             goto fail;
 203
 204         if (!i->type) {
 205             /* This is the first token, hence the main type */
 206
 207             if (!avahi_is_valid_service_type_strict(token))
 208                 goto fail;
 209
 210             i->type = token;
 211             token = NULL;
 212         } else {
 213             char *fst;
 214
 215             /* This is not the first token, hence a subtype */
 216
 217             if (!(fst = avahi_strdup_printf("%s._sub.%s", token, i->type)))
 218                 goto fail;
 219
 220             if (!avahi_is_valid_service_subtype(fst)) {
 221                 avahi_free(fst);
 222                 goto fail;
 223             }
 224
 225             i->subtypes = avahi_string_list_add(i->subtypes, fst);
 226             avahi_free(fst);
 227
 228             avahi_free(token);
 229             token = NULL;
 230
 231             i->n_subtypes++;
 232         }
 233
 234         t += l;
 235
 236         if (*t == ',')
 237             t++;
 238     }
 239
 240     if (i->type)
 241         return 0;
 242
 243 fail:
 244     type_info_free(i);
 245     avahi_free(token);
 246     return -1;
 247 }
 248
 249 static const char *add_trailing_dot(const char *s, char *buf, size_t buf_len) {
 250     if (!s)
 251         return NULL;
 252
 253     if (*s == 0)
 254         return s;
 255
 256     if (s[strlen(s)-1] == '.')
 257         return s;
 258
 259     snprintf(buf, buf_len, "%s.", s);
 260     return buf;
 261 }
 262
 263 static int read_command(int fd) {
 264     ssize_t r;
 265     char command;
 266
 267     assert(fd >= 0);
 268
 269     if ((r = read(fd, &command, 1)) != 1) {
 270         fprintf(stderr, __FILE__": read() failed: %s\n", r < 0 ? strerror(errno) : "EOF");
 271         return -1;
 272     }
 273
 274     return command;
 275 }
 276
 277 static int write_command(int fd, char reply) {
 278     assert(fd >= 0);
 279
 280     if (write(fd, &reply, 1) != 1) {
 281         fprintf(stderr, __FILE__": write() failed: %s\n", strerror(errno));
 282         return -1;
 283     }
 284
 285     return 0;
 286 }
 287
 288 static int poll_func(struct pollfd *ufds, unsigned int nfds, int timeout, void *userdata) {
 289     DNSServiceRef sdref = userdata;
 290     int ret;
 291
 292     assert(sdref);
 293
 294     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 295
 296 /*     fprintf(stderr, "pre-syscall\n"); */
 297     ret = poll(ufds, nfds, timeout);
 298 /*     fprintf(stderr, "post-syscall\n"); */
 299
 300     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 301
 302     return ret;
 303 }
 304
 305 static void * thread_func(void *data) {
 306     DNSServiceRef sdref = data;
 307     sigset_t mask;
 308
 309     sigfillset(&mask);
 310     pthread_sigmask(SIG_BLOCK, &mask, NULL);
 311
 312     sdref->thread = pthread_self();
 313     sdref->thread_running = 1;
 314
 315     for (;;) {
 316         char command;
 317
 318         if ((command = read_command(sdref->thread_fd)) < 0)
 319             break;
 320
 321 /*         fprintf(stderr, "Command: %c\n", command); */
 322
 323         switch (command) {
 324
 325             case COMMAND_POLL: {
 326                 int ret;
 327
 328                 ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 329
 330                 for (;;) {
 331                     errno = 0;
 332
 333                     if ((ret = avahi_simple_poll_run(sdref->simple_poll)) < 0) {
 334
 335                         if (errno == EINTR)
 336                             continue;
 337
 338                         fprintf(stderr, __FILE__": avahi_simple_poll_run() failed: %s\n", strerror(errno));
 339                     }
 340
 341                     break;
 342                 }
 343
 344                 ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 345
 346                 if (write_command(sdref->thread_fd, ret < 0 ? COMMAND_POLL_FAILED : COMMAND_POLL_DONE) < 0)
 347                     break;
 348
 349                 break;
 350             }
 351
 352             case COMMAND_QUIT:
 353                 return NULL;
 354         }
 355
 356     }
 357
 358     return NULL;
 359 }
 360
 361 static DNSServiceRef sdref_new(void) {
 362     int fd[2] = { -1, -1 };
 363     DNSServiceRef sdref = NULL;
 364     pthread_mutexattr_t mutex_attr;
 365
 366     if (socketpair(AF_UNIX, SOCK_STREAM, 0, fd) < 0)
 367         goto fail;
 368
 369     if (!(sdref = avahi_new(struct _DNSServiceRef_t, 1)))
 370         goto fail;
 371
 372     sdref->n_ref = 1;
 373     sdref->thread_fd = fd[0];
 374     sdref->main_fd = fd[1];
 375
 376     sdref->client = NULL;
 377     sdref->service_browser = NULL;
 378     sdref->service_resolver = NULL;
 379     sdref->domain_browser = NULL;
 380     sdref->entry_group = NULL;
 381
 382     sdref->service_name = sdref->service_name_chosen = sdref->service_domain = sdref->service_host = NULL;
 383     sdref->service_txt = NULL;
 384
 385     type_info_init(&sdref->type_info);
 386
 387     ASSERT_SUCCESS(pthread_mutexattr_init(&mutex_attr));
 388     pthread_mutexattr_settype(&mutex_attr, PTHREAD_MUTEX_RECURSIVE);
 389     ASSERT_SUCCESS(pthread_mutex_init(&sdref->mutex, &mutex_attr));
 390
 391     sdref->thread_running = 0;
 392
 393     if (!(sdref->simple_poll = avahi_simple_poll_new()))
 394         goto fail;
 395
 396     avahi_simple_poll_set_func(sdref->simple_poll, poll_func, sdref);
 397
 398     /* Start simple poll */
 399     if (avahi_simple_poll_prepare(sdref->simple_poll, -1) < 0)
 400         goto fail;
 401
 402     /* Queue an initial POLL command for the thread */
 403     if (write_command(sdref->main_fd, COMMAND_POLL) < 0)
 404         goto fail;
 405
 406     if (pthread_create(&sdref->thread, NULL, thread_func, sdref) != 0)
 407         goto fail;
 408
 409     sdref->thread_running = 1;
 410
 411     return sdref;
 412
 413 fail:
 414
 415     if (sdref)
 416         DNSServiceRefDeallocate(sdref);
 417
 418     return NULL;
 419 }
 420
 421 static void sdref_free(DNSServiceRef sdref) {
 422     assert(sdref);
 423
 424     if (sdref->thread_running) {
 425         ASSERT_SUCCESS(write_command(sdref->main_fd, COMMAND_QUIT));
 426         avahi_simple_poll_wakeup(sdref->simple_poll);
 427         ASSERT_SUCCESS(pthread_join(sdref->thread, NULL));
 428     }
 429
 430     if (sdref->client)
 431         avahi_client_free(sdref->client);
 432
 433     if (sdref->simple_poll)
 434         avahi_simple_poll_free(sdref->simple_poll);
 435
 436     if (sdref->thread_fd >= 0)
 437         close(sdref->thread_fd);
 438
 439     if (sdref->main_fd >= 0)
 440         close(sdref->main_fd);
 441
 442     ASSERT_SUCCESS(pthread_mutex_destroy(&sdref->mutex));
 443
 444     avahi_free(sdref->service_name);
 445     avahi_free(sdref->service_name_chosen);
 446     avahi_free(sdref->service_domain);
 447     avahi_free(sdref->service_host);
 448
 449     type_info_free(&sdref->type_info);
 450
 451     avahi_string_list_free(sdref->service_txt);
 452
 453     avahi_free(sdref);
 454 }
 455
 456 static void sdref_ref(DNSServiceRef sdref) {
 457     assert(sdref);
 458     assert(sdref->n_ref >= 1);
 459
 460     sdref->n_ref++;
 461 }
 462
 463 static void sdref_unref(DNSServiceRef sdref) {
 464     assert(sdref);
 465     assert(sdref->n_ref >= 1);
 466
 467     if (--(sdref->n_ref) <= 0)
 468         sdref_free(sdref);
 469 }
 470
 471 int DNSSD_API DNSServiceRefSockFD(DNSServiceRef sdref) {
 472
 473     AVAHI_WARN_LINKAGE;
 474
 475     if (!sdref || sdref->n_ref <= 0)
 476         return -1;
 477
 478     return sdref->main_fd;
 479 }
 480
 481 DNSServiceErrorType DNSSD_API DNSServiceProcessResult(DNSServiceRef sdref) {
 482     DNSServiceErrorType ret = kDNSServiceErr_Unknown;
 483
 484     AVAHI_WARN_LINKAGE;
 485
 486     if (!sdref || sdref->n_ref <= 0)
 487         return kDNSServiceErr_BadParam;
 488
 489     sdref_ref(sdref);
 490
 491     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 492
 493     /* Cleanup notification socket */
 494     if (read_command(sdref->main_fd) != COMMAND_POLL_DONE)
 495         goto finish;
 496
 497     if (avahi_simple_poll_dispatch(sdref->simple_poll) < 0)
 498         goto finish;
 499
 500     if (sdref->n_ref > 1) /* Perhaps we should die */
 501
 502         /* Dispatch events */
 503         if (avahi_simple_poll_prepare(sdref->simple_poll, -1) < 0)
 504             goto finish;
 505
 506     if (sdref->n_ref > 1)
 507
 508         /* Request the poll */
 509         if (write_command(sdref->main_fd, COMMAND_POLL) < 0)
 510             goto finish;
 511
 512     ret = kDNSServiceErr_NoError;
 513
 514 finish:
 515
 516     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 517
 518     sdref_unref(sdref);
 519
 520     return ret;
 521 }
 522
 523 void DNSSD_API DNSServiceRefDeallocate(DNSServiceRef sdref) {
 524     AVAHI_WARN_LINKAGE;
 525
 526     if (sdref)
 527         sdref_unref(sdref);
 528 }
 529
 530 static void service_browser_callback(
 531     AvahiServiceBrowser *b,
 532     AvahiIfIndex interface,
 533     AVAHI_GCC_UNUSED AvahiProtocol protocol,
 534     AvahiBrowserEvent event,
 535     const char *name,
 536     const char *type,
 537     const char *domain,
 538     AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
 539     void *userdata) {
 540
 541     DNSServiceRef sdref = userdata;
 542     char type_fixed[AVAHI_DOMAIN_NAME_MAX], domain_fixed[AVAHI_DOMAIN_NAME_MAX];
 543     assert(b);
 544     assert(sdref);
 545     assert(sdref->n_ref >= 1);
 546
 547     type = add_trailing_dot(type, type_fixed, sizeof(type_fixed));
 548     domain  = add_trailing_dot(domain, domain_fixed, sizeof(domain_fixed));
 549
 550     switch (event) {
 551         case AVAHI_BROWSER_NEW:
 552             sdref->service_browser_callback(sdref, kDNSServiceFlagsAdd, interface, kDNSServiceErr_NoError, name, type, domain, sdref->context);
 553             break;
 554
 555         case AVAHI_BROWSER_REMOVE:
 556             sdref->service_browser_callback(sdref, 0, interface, kDNSServiceErr_NoError, name, type, domain, sdref->context);
 557             break;
 558
 559         case AVAHI_BROWSER_FAILURE:
 560             sdref->service_browser_callback(sdref, 0, interface, map_error(avahi_client_errno(sdref->client)), NULL, NULL, NULL, sdref->context);
 561             break;
 562
 563         case AVAHI_BROWSER_CACHE_EXHAUSTED:
 564         case AVAHI_BROWSER_ALL_FOR_NOW:
 565             break;
 566     }
 567 }
 568
 569 static void generic_client_callback(AvahiClient *s, AvahiClientState state, void* userdata) {
 570     DNSServiceRef sdref = userdata;
 571     int error = kDNSServiceErr_Unknown;
 572
 573     assert(s);
 574     assert(sdref);
 575     assert(sdref->n_ref >= 1);
 576
 577     switch (state) {
 578
 579         case AVAHI_CLIENT_FAILURE:
 580
 581             if (sdref->service_browser_callback)
 582                 sdref->service_browser_callback(sdref, 0, 0, error, NULL, NULL, NULL, sdref->context);
 583             else if (sdref->service_resolver_callback)
 584                 sdref->service_resolver_callback(sdref, 0, 0, error, NULL, NULL, 0, 0, NULL, sdref->context);
 585             else if (sdref->domain_browser_callback)
 586                 sdref->domain_browser_callback(sdref, 0, 0, error, NULL, sdref->context);
 587
 588             break;
 589
 590         case AVAHI_CLIENT_S_RUNNING:
 591         case AVAHI_CLIENT_S_COLLISION:
 592         case AVAHI_CLIENT_S_REGISTERING:
 593         case AVAHI_CLIENT_CONNECTING:
 594             break;
 595     }
 596 }
 597
 598 DNSServiceErrorType DNSSD_API DNSServiceBrowse(
 599         DNSServiceRef *ret_sdref,
 600         DNSServiceFlags flags,
 601         uint32_t interface,
 602         const char *regtype,
 603         const char *domain,
 604         DNSServiceBrowseReply callback,
 605         void *context) {
 606
 607     DNSServiceErrorType ret = kDNSServiceErr_Unknown;
 608     int error;
 609     DNSServiceRef sdref = NULL;
 610     AvahiIfIndex ifindex;
 611     struct type_info type_info;
 612
 613     AVAHI_WARN_LINKAGE;
 614
 615     if (!ret_sdref || !regtype)
 616         return kDNSServiceErr_BadParam;
 617     *ret_sdref = NULL;
 618
 619     if (interface == kDNSServiceInterfaceIndexLocalOnly || flags != 0) {
 620         AVAHI_WARN_UNSUPPORTED;
 621         return kDNSServiceErr_Unsupported;
 622     }
 623
 624     type_info_init(&type_info);
 625
 626     if (type_info_parse(&type_info, regtype) < 0 || type_info.n_subtypes > 1) {
 627         type_info_free(&type_info);
 628
 629         if (!avahi_is_valid_service_type_generic(regtype))
 630             return kDNSServiceErr_Unsupported;
 631     } else
 632         regtype = type_info.subtypes ? (char*) type_info.subtypes->text : type_info.type;
 633
 634     if (!(sdref = sdref_new())) {
 635         type_info_free(&type_info);
 636         return kDNSServiceErr_Unknown;
 637     }
 638
 639     sdref->context = context;
 640     sdref->service_browser_callback = callback;
 641
 642     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 643
 644     if (!(sdref->client = avahi_client_new(avahi_simple_poll_get(sdref->simple_poll), 0, generic_client_callback, sdref, &error))) {
 645         ret =  map_error(error);
 646         goto finish;
 647     }
 648
 649     ifindex = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
 650
 651     if (!(sdref->service_browser = avahi_service_browser_new(sdref->client, ifindex, AVAHI_PROTO_UNSPEC, regtype, domain, 0, service_browser_callback, sdref))) {
 652         ret = map_error(avahi_client_errno(sdref->client));
 653         goto finish;
 654     }
 655
 656     ret = kDNSServiceErr_NoError;
 657     *ret_sdref = sdref;
 658
 659 finish:
 660
 661     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 662
 663     if (ret != kDNSServiceErr_NoError)
 664         DNSServiceRefDeallocate(sdref);
 665
 666     type_info_free(&type_info);
 667
 668     return ret;
 669 }
 670
 671 static void service_resolver_callback(
 672     AvahiServiceResolver *r,
 673     AvahiIfIndex interface,
 674     AVAHI_GCC_UNUSED AvahiProtocol protocol,
 675     AvahiResolverEvent event,
 676     const char *name,
 677     const char *type,
 678     const char *domain,
 679     const char *host_name,
 680     AVAHI_GCC_UNUSED const AvahiAddress *a,
 681     uint16_t port,
 682     AvahiStringList *txt,
 683     AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
 684     void *userdata) {
 685
 686     DNSServiceRef sdref = userdata;
 687
 688     assert(r);
 689     assert(sdref);
 690     assert(sdref->n_ref >= 1);
 691
 692     switch (event) {
 693         case AVAHI_RESOLVER_FOUND: {
 694
 695             char host_name_fixed[AVAHI_DOMAIN_NAME_MAX];
 696             char full_name[AVAHI_DOMAIN_NAME_MAX];
 697             int ret;
 698             char *p = NULL;
 699             size_t l = 0;
 700
 701             host_name = add_trailing_dot(host_name, host_name_fixed, sizeof(host_name_fixed));
 702
 703             if ((p = avahi_new0(char, (l = avahi_string_list_serialize(txt, NULL, 0))+1)))
 704                 avahi_string_list_serialize(txt, p, l);
 705
 706             ret = avahi_service_name_join(full_name, sizeof(full_name), name, type, domain);
 707             assert(ret == AVAHI_OK);
 708
 709             strcat(full_name, ".");
 710
 711             sdref->service_resolver_callback(sdref, 0, interface, kDNSServiceErr_NoError, full_name, host_name, htons(port), l, (unsigned char*) p, sdref->context);
 712
 713             avahi_free(p);
 714             break;
 715         }
 716
 717         case AVAHI_RESOLVER_FAILURE:
 718             sdref->service_resolver_callback(sdref, 0, interface, map_error(avahi_client_errno(sdref->client)), NULL, NULL, 0, 0, NULL, sdref->context);
 719             break;
 720     }
 721 }
 722
 723 DNSServiceErrorType DNSSD_API DNSServiceResolve(
 724     DNSServiceRef *ret_sdref,
 725     DNSServiceFlags flags,
 726     uint32_t interface,
 727     const char *name,
 728     const char *regtype,
 729     const char *domain,
 730     DNSServiceResolveReply callback,
 731     void *context) {
 732
 733     DNSServiceErrorType ret = kDNSServiceErr_Unknown;
 734     int error;
 735     DNSServiceRef sdref = NULL;
 736     AvahiIfIndex ifindex;
 737
 738     AVAHI_WARN_LINKAGE;
 739
 740     if (!ret_sdref || !name || !regtype || !domain || !callback)
 741         return kDNSServiceErr_BadParam;
 742     *ret_sdref = NULL;
 743
 744     if (interface == kDNSServiceInterfaceIndexLocalOnly || flags != 0) {
 745         AVAHI_WARN_UNSUPPORTED;
 746         return kDNSServiceErr_Unsupported;
 747     }
 748
 749     if (!(sdref = sdref_new()))
 750         return kDNSServiceErr_Unknown;
 751
 752     sdref->context = context;
 753     sdref->service_resolver_callback = callback;
 754
 755     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 756
 757     if (!(sdref->client = avahi_client_new(avahi_simple_poll_get(sdref->simple_poll), 0, generic_client_callback, sdref, &error))) {
 758         ret =  map_error(error);
 759         goto finish;
 760     }
 761
 762     ifindex = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
 763
 764     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))) {
 765         ret = map_error(avahi_client_errno(sdref->client));
 766         goto finish;
 767     }
 768
 769
 770     ret = kDNSServiceErr_NoError;
 771     *ret_sdref = sdref;
 772
 773 finish:
 774
 775     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 776
 777     if (ret != kDNSServiceErr_NoError)
 778         DNSServiceRefDeallocate(sdref);
 779
 780     return ret;
 781 }
 782
 783 int DNSSD_API DNSServiceConstructFullName (
 784     char *fullName,
 785     const char *service,
 786     const char *regtype,
 787     const char *domain) {
 788
 789     AVAHI_WARN_LINKAGE;
 790
 791     if (!fullName || !regtype || !domain)
 792         return -1;
 793
 794     if (avahi_service_name_join(fullName, kDNSServiceMaxDomainName, service, regtype, domain) < 0)
 795         return -1;
 796
 797     return 0;
 798 }
 799
 800 static void domain_browser_callback(
 801     AvahiDomainBrowser *b,
 802     AvahiIfIndex interface,
 803     AVAHI_GCC_UNUSED AvahiProtocol protocol,
 804     AvahiBrowserEvent event,
 805     const char *domain,
 806     AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
 807     void *userdata) {
 808
 809     DNSServiceRef sdref = userdata;
 810     static char domain_fixed[AVAHI_DOMAIN_NAME_MAX];
 811
 812     assert(b);
 813     assert(sdref);
 814     assert(sdref->n_ref >= 1);
 815
 816     domain  = add_trailing_dot(domain, domain_fixed, sizeof(domain_fixed));
 817
 818     switch (event) {
 819         case AVAHI_BROWSER_NEW:
 820             sdref->domain_browser_callback(sdref, kDNSServiceFlagsAdd, interface, kDNSServiceErr_NoError, domain, sdref->context);
 821             break;
 822
 823         case AVAHI_BROWSER_REMOVE:
 824             sdref->domain_browser_callback(sdref, 0, interface, kDNSServiceErr_NoError, domain, sdref->context);
 825             break;
 826
 827         case AVAHI_BROWSER_FAILURE:
 828             sdref->domain_browser_callback(sdref, 0, interface, map_error(avahi_client_errno(sdref->client)), domain, sdref->context);
 829             break;
 830
 831         case AVAHI_BROWSER_CACHE_EXHAUSTED:
 832         case AVAHI_BROWSER_ALL_FOR_NOW:
 833             break;
 834     }
 835 }
 836
 837 DNSServiceErrorType DNSSD_API DNSServiceEnumerateDomains(
 838     DNSServiceRef *ret_sdref,
 839     DNSServiceFlags flags,
 840     uint32_t interface,
 841     DNSServiceDomainEnumReply callback,
 842     void *context) {
 843
 844     DNSServiceErrorType ret = kDNSServiceErr_Unknown;
 845     int error;
 846     DNSServiceRef sdref = NULL;
 847     AvahiIfIndex ifindex;
 848
 849     AVAHI_WARN_LINKAGE;
 850
 851     if (!ret_sdref || !callback)
 852         return kDNSServiceErr_BadParam;
 853     *ret_sdref = NULL;
 854
 855     if (interface == kDNSServiceInterfaceIndexLocalOnly ||
 856         (flags != kDNSServiceFlagsBrowseDomains &&  flags != kDNSServiceFlagsRegistrationDomains)) {
 857         AVAHI_WARN_UNSUPPORTED;
 858         return kDNSServiceErr_Unsupported;
 859     }
 860
 861     if (!(sdref = sdref_new()))
 862         return kDNSServiceErr_Unknown;
 863
 864     sdref->context = context;
 865     sdref->domain_browser_callback = callback;
 866
 867     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 868
 869     if (!(sdref->client = avahi_client_new(avahi_simple_poll_get(sdref->simple_poll), 0, generic_client_callback, sdref, &error))) {
 870         ret =  map_error(error);
 871         goto finish;
 872     }
 873
 874     ifindex = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
 875
 876     if (!(sdref->domain_browser = avahi_domain_browser_new(sdref->client, ifindex, AVAHI_PROTO_UNSPEC, "local",
 877                                                            flags == kDNSServiceFlagsRegistrationDomains ? AVAHI_DOMAIN_BROWSER_REGISTER : AVAHI_DOMAIN_BROWSER_BROWSE,
 878                                                            0, domain_browser_callback, sdref))) {
 879         ret = map_error(avahi_client_errno(sdref->client));
 880         goto finish;
 881     }
 882
 883     ret = kDNSServiceErr_NoError;
 884     *ret_sdref = sdref;
 885
 886 finish:
 887
 888     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 889
 890     if (ret != kDNSServiceErr_NoError)
 891         DNSServiceRefDeallocate(sdref);
 892
 893     return ret;
 894 }
 895
 896 static void reg_report_error(DNSServiceRef sdref, DNSServiceErrorType error) {
 897     char regtype_fixed[AVAHI_DOMAIN_NAME_MAX], domain_fixed[AVAHI_DOMAIN_NAME_MAX];
 898     const char *regtype, *domain;
 899     assert(sdref);
 900     assert(sdref->n_ref >= 1);
 901
 902     if (!sdref->service_register_callback)
 903         return;
 904
 905     regtype = add_trailing_dot(sdref->type_info.type, regtype_fixed, sizeof(regtype_fixed));
 906     domain = add_trailing_dot(sdref->service_domain, domain_fixed, sizeof(domain_fixed));
 907
 908     sdref->service_register_callback(
 909         sdref, 0, error,
 910         sdref->service_name_chosen ? sdref->service_name_chosen : sdref->service_name,
 911         regtype,
 912         domain,
 913         sdref->context);
 914 }
 915
 916 static int reg_create_service(DNSServiceRef sdref) {
 917     int ret;
 918     AvahiStringList *l;
 919
 920     assert(sdref);
 921     assert(sdref->n_ref >= 1);
 922
 923     if ((ret = avahi_entry_group_add_service_strlst(
 924         sdref->entry_group,
 925         sdref->service_interface,
 926         AVAHI_PROTO_UNSPEC,
 927         0,
 928         sdref->service_name_chosen,
 929         sdref->type_info.type,
 930         sdref->service_domain,
 931         sdref->service_host,
 932         sdref->service_port,
 933         sdref->service_txt)) < 0)
 934         return ret;
 935
 936     for (l = sdref->type_info.subtypes; l; l = l->next) {
 937         /* Create a subtype entry */
 938
 939         if (avahi_entry_group_add_service_subtype(
 940                 sdref->entry_group,
 941                 sdref->service_interface,
 942                 AVAHI_PROTO_UNSPEC,
 943                 0,
 944                 sdref->service_name_chosen,
 945                 sdref->type_info.type,
 946                 sdref->service_domain,
 947                 (const char*) l->text) < 0)
 948             return ret;
 949     }
 950
 951     if ((ret = avahi_entry_group_commit(sdref->entry_group)) < 0)
 952         return ret;
 953
 954     return 0;
 955 }
 956
 957 static void reg_client_callback(AvahiClient *s, AvahiClientState state, void* userdata) {
 958     DNSServiceRef sdref = userdata;
 959
 960     assert(s);
 961     assert(sdref);
 962     assert(sdref->n_ref >= 1);
 963
 964     /* We've not been setup completely */
 965     if (!sdref->entry_group)
 966         return;
 967
 968     switch (state) {
 969         case AVAHI_CLIENT_FAILURE:
 970             reg_report_error(sdref, kDNSServiceErr_Unknown);
 971             break;
 972
 973         case AVAHI_CLIENT_S_RUNNING: {
 974             int ret;
 975
 976             if (!sdref->service_name) {
 977                 const char *n;
 978                 /* If the service name is taken from the host name, copy that */
 979
 980                 avahi_free(sdref->service_name_chosen);
 981                 sdref->service_name_chosen = NULL;
 982
 983                 if (!(n = avahi_client_get_host_name(sdref->client))) {
 984                     reg_report_error(sdref, map_error(avahi_client_errno(sdref->client)));
 985                     return;
 986                 }
 987
 988                 if (!(sdref->service_name_chosen = avahi_strdup(n))) {
 989                     reg_report_error(sdref, kDNSServiceErr_NoMemory);
 990                     return;
 991                 }
 992             }
 993
 994             /* Register the service */
 995
 996             if ((ret = reg_create_service(sdref)) < 0) {
 997                 reg_report_error(sdref, map_error(ret));
 998                 return;
 999             }
1000
1001             break;
1002         }
1003
1004         case AVAHI_CLIENT_S_COLLISION:
1005         case AVAHI_CLIENT_S_REGISTERING:
1006
1007             /* Remove our entry */
1008             avahi_entry_group_reset(sdref->entry_group);
1009
1010             break;
1011
1012         case AVAHI_CLIENT_CONNECTING:
1013             /* Ignore */
1014             break;
1015     }
1016
1017 }
1018
1019 static void reg_entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
1020     DNSServiceRef sdref = userdata;
1021
1022     assert(g);
1023
1024     switch (state) {
1025         case AVAHI_ENTRY_GROUP_ESTABLISHED:
1026
1027             /* Inform the user */
1028             reg_report_error(sdref, kDNSServiceErr_NoError);
1029
1030             break;
1031
1032         case AVAHI_ENTRY_GROUP_COLLISION: {
1033             char *n;
1034             int ret;
1035
1036             /* Remove our entry */
1037             avahi_entry_group_reset(sdref->entry_group);
1038
1039             assert(sdref->service_name_chosen);
1040
1041             /* Pick a new name */
1042             if (!(n = avahi_alternative_service_name(sdref->service_name_chosen))) {
1043                 reg_report_error(sdref, kDNSServiceErr_NoMemory);
1044                 return;
1045             }
1046             avahi_free(sdref->service_name_chosen);
1047             sdref->service_name_chosen = n;
1048
1049             /* Register the service with that new name */
1050             if ((ret = reg_create_service(sdref)) < 0) {
1051                 reg_report_error(sdref, map_error(ret));
1052                 return;
1053             }
1054
1055             break;
1056         }
1057
1058         case AVAHI_ENTRY_GROUP_REGISTERING:
1059         case AVAHI_ENTRY_GROUP_UNCOMMITED:
1060             /* Ignore */
1061             break;
1062
1063         case AVAHI_ENTRY_GROUP_FAILURE:
1064             /* Inform the user */
1065             reg_report_error(sdref, map_error(avahi_client_errno(sdref->client)));
1066             break;
1067
1068     }
1069 }
1070
1071 DNSServiceErrorType DNSSD_API DNSServiceRegister (
1072         DNSServiceRef *ret_sdref,
1073         DNSServiceFlags flags,
1074         uint32_t interface,
1075         const char *name,
1076         const char *regtype,
1077         const char *domain,
1078         const char *host,
1079         uint16_t port,
1080         uint16_t txtLen,
1081         const void *txtRecord,
1082         DNSServiceRegisterReply callback,
1083         void *context) {
1084
1085     DNSServiceErrorType ret = kDNSServiceErr_Unknown;
1086     int error;
1087     DNSServiceRef sdref = NULL;
1088     AvahiStringList *txt = NULL;
1089     struct type_info type_info;
1090
1091     AVAHI_WARN_LINKAGE;
1092
1093     if (!ret_sdref || !regtype)
1094         return kDNSServiceErr_BadParam;
1095     *ret_sdref = NULL;
1096
1097     if (!txtRecord) {
1098         txtLen = 1;
1099         txtRecord = "";
1100     }
1101
1102     if (interface == kDNSServiceInterfaceIndexLocalOnly || flags) {
1103         AVAHI_WARN_UNSUPPORTED;
1104         return kDNSServiceErr_Unsupported;
1105     }
1106
1107     if (txtLen > 0)
1108         if (avahi_string_list_parse(txtRecord, txtLen, &txt) < 0)
1109             return kDNSServiceErr_Invalid;
1110
1111     if (type_info_parse(&type_info, regtype) < 0) {
1112         avahi_string_list_free(txt);
1113         return kDNSServiceErr_Invalid;
1114     }
1115
1116     if (!(sdref = sdref_new())) {
1117         avahi_string_list_free(txt);
1118         type_info_free(&type_info);
1119         return kDNSServiceErr_Unknown;
1120     }
1121
1122     sdref->context = context;
1123     sdref->service_register_callback = callback;
1124
1125     sdref->type_info = type_info;
1126     sdref->service_name = avahi_strdup(name);
1127     sdref->service_domain = domain ? avahi_normalize_name_strdup(domain) : NULL;
1128     sdref->service_host = host ? avahi_normalize_name_strdup(host) : NULL;
1129     sdref->service_interface = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
1130     sdref->service_port = ntohs(port);
1131     sdref->service_txt = txt;
1132
1133     /* Some OOM checking would be cool here */
1134
1135     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
1136
1137     if (!(sdref->client = avahi_client_new(avahi_simple_poll_get(sdref->simple_poll), 0, reg_client_callback, sdref, &error))) {
1138         ret =  map_error(error);
1139         goto finish;
1140     }
1141
1142     if (!sdref->service_domain) {
1143         const char *d;
1144
1145         if (!(d = avahi_client_get_domain_name(sdref->client))) {
1146             ret = map_error(avahi_client_errno(sdref->client));
1147             goto finish;
1148         }
1149
1150         if (!(sdref->service_domain = avahi_strdup(d))) {
1151             ret = kDNSServiceErr_NoMemory;
1152             goto finish;
1153         }
1154     }
1155
1156     if (!(sdref->entry_group = avahi_entry_group_new(sdref->client, reg_entry_group_callback, sdref))) {
1157         ret = map_error(avahi_client_errno(sdref->client));
1158         goto finish;
1159     }
1160
1161     if (avahi_client_get_state(sdref->client) == AVAHI_CLIENT_S_RUNNING) {
1162         const char *n;
1163
1164         if (sdref->service_name)
1165             n = sdref->service_name;
1166         else {
1167             if (!(n = avahi_client_get_host_name(sdref->client))) {
1168                 ret = map_error(avahi_client_errno(sdref->client));
1169                 goto finish;
1170             }
1171         }
1172
1173         if (!(sdref->service_name_chosen = avahi_strdup(n))) {
1174             ret = kDNSServiceErr_NoMemory;
1175             goto finish;
1176         }
1177
1178
1179         if ((error = reg_create_service(sdref)) < 0) {
1180             ret = map_error(error);
1181             goto finish;
1182         }
1183     }
1184
1185     ret = kDNSServiceErr_NoError;
1186     *ret_sdref = sdref;
1187
1188 finish:
1189
1190     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
1191
1192     if (ret != kDNSServiceErr_NoError)
1193         DNSServiceRefDeallocate(sdref);
1194
1195     return ret;
1196 }
1197
1198 DNSServiceErrorType DNSSD_API DNSServiceUpdateRecord(
1199          DNSServiceRef sdref,
1200          DNSRecordRef rref,
1201          DNSServiceFlags flags,
1202          uint16_t rdlen,
1203          const void *rdata,
1204          AVAHI_GCC_UNUSED uint32_t ttl) {
1205
1206     int ret = kDNSServiceErr_Unknown;
1207     AvahiStringList *txt = NULL;
1208
1209     AVAHI_WARN_LINKAGE;
1210
1211     if (!sdref || sdref->n_ref <= 0)
1212         return kDNSServiceErr_BadParam;
1213
1214     if (flags || rref) {
1215         AVAHI_WARN_UNSUPPORTED;
1216         return kDNSServiceErr_Unsupported;
1217     }
1218
1219     if (rdlen > 0)
1220         if (avahi_string_list_parse(rdata, rdlen, &txt) < 0)
1221             return kDNSServiceErr_Invalid;
1222
1223     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
1224
1225     if (!avahi_string_list_equal(txt, sdref->service_txt)) {
1226
1227         avahi_string_list_free(sdref->service_txt);
1228         sdref->service_txt = txt;
1229
1230         if (avahi_client_get_state(sdref->client) == AVAHI_CLIENT_S_RUNNING &&
1231             sdref->entry_group &&
1232             (avahi_entry_group_get_state(sdref->entry_group) == AVAHI_ENTRY_GROUP_ESTABLISHED ||
1233             avahi_entry_group_get_state(sdref->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING))
1234
1235             if (avahi_entry_group_update_service_txt_strlst(
1236                         sdref->entry_group,
1237                         sdref->service_interface,
1238                         AVAHI_PROTO_UNSPEC,
1239                         0,
1240                         sdref->service_name_chosen,
1241                         sdref->type_info.type,
1242                         sdref->service_domain,
1243                         sdref->service_txt) < 0) {
1244
1245                 ret = map_error(avahi_client_errno(sdref->client));
1246                 goto finish;
1247             }
1248
1249     } else
1250         avahi_string_list_free(txt);
1251
1252     ret = kDNSServiceErr_NoError;
1253
1254 finish:
1255     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
1256
1257     return ret;
1258 }
1259