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)
 616         return kDNSServiceErr_BadParam;
 617     *ret_sdref = NULL;
 618
 619     assert(regtype);
 620
 621     if (interface == kDNSServiceInterfaceIndexLocalOnly || flags != 0) {
 622         AVAHI_WARN_UNSUPPORTED;
 623         return kDNSServiceErr_Unsupported;
 624     }
 625
 626     type_info_init(&type_info);
 627
 628     if (type_info_parse(&type_info, regtype) < 0 || type_info.n_subtypes > 1) {
 629         type_info_free(&type_info);
 630
 631         if (!avahi_is_valid_service_type_generic(regtype))
 632             return kDNSServiceErr_Unsupported;
 633     } else
 634         regtype = type_info.subtypes ? (char*) type_info.subtypes->text : type_info.type;
 635
 636     if (!(sdref = sdref_new())) {
 637         type_info_free(&type_info);
 638         return kDNSServiceErr_Unknown;
 639     }
 640
 641     sdref->context = context;
 642     sdref->service_browser_callback = callback;
 643
 644     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 645
 646     if (!(sdref->client = avahi_client_new(avahi_simple_poll_get(sdref->simple_poll), 0, generic_client_callback, sdref, &error))) {
 647         ret =  map_error(error);
 648         goto finish;
 649     }
 650
 651     ifindex = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
 652
 653     if (!(sdref->service_browser = avahi_service_browser_new(sdref->client, ifindex, AVAHI_PROTO_UNSPEC, regtype, domain, 0, service_browser_callback, sdref))) {
 654         ret = map_error(avahi_client_errno(sdref->client));
 655         goto finish;
 656     }
 657
 658     ret = kDNSServiceErr_NoError;
 659     *ret_sdref = sdref;
 660
 661 finish:
 662
 663     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 664
 665     if (ret != kDNSServiceErr_NoError)
 666         DNSServiceRefDeallocate(sdref);
 667
 668     type_info_free(&type_info);
 669
 670     return ret;
 671 }
 672
 673 static void service_resolver_callback(
 674     AvahiServiceResolver *r,
 675     AvahiIfIndex interface,
 676     AVAHI_GCC_UNUSED AvahiProtocol protocol,
 677     AvahiResolverEvent event,
 678     const char *name,
 679     const char *type,
 680     const char *domain,
 681     const char *host_name,
 682     AVAHI_GCC_UNUSED const AvahiAddress *a,
 683     uint16_t port,
 684     AvahiStringList *txt,
 685     AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
 686     void *userdata) {
 687
 688     DNSServiceRef sdref = userdata;
 689
 690     assert(r);
 691     assert(sdref);
 692     assert(sdref->n_ref >= 1);
 693
 694     switch (event) {
 695         case AVAHI_RESOLVER_FOUND: {
 696
 697             char host_name_fixed[AVAHI_DOMAIN_NAME_MAX];
 698             char full_name[AVAHI_DOMAIN_NAME_MAX];
 699             int ret;
 700             char *p = NULL;
 701             size_t l = 0;
 702
 703             host_name = add_trailing_dot(host_name, host_name_fixed, sizeof(host_name_fixed));
 704
 705             if ((p = avahi_new0(char, (l = avahi_string_list_serialize(txt, NULL, 0))+1)))
 706                 avahi_string_list_serialize(txt, p, l);
 707
 708             ret = avahi_service_name_join(full_name, sizeof(full_name), name, type, domain);
 709             assert(ret == AVAHI_OK);
 710
 711             strcat(full_name, ".");
 712
 713             sdref->service_resolver_callback(sdref, 0, interface, kDNSServiceErr_NoError, full_name, host_name, htons(port), l, (unsigned char*) p, sdref->context);
 714
 715             avahi_free(p);
 716             break;
 717         }
 718
 719         case AVAHI_RESOLVER_FAILURE:
 720             sdref->service_resolver_callback(sdref, 0, interface, map_error(avahi_client_errno(sdref->client)), NULL, NULL, 0, 0, NULL, sdref->context);
 721             break;
 722     }
 723 }
 724
 725 DNSServiceErrorType DNSSD_API DNSServiceResolve(
 726     DNSServiceRef *ret_sdref,
 727     DNSServiceFlags flags,
 728     uint32_t interface,
 729     const char *name,
 730     const char *regtype,
 731     const char *domain,
 732     DNSServiceResolveReply callback,
 733     void *context) {
 734
 735     DNSServiceErrorType ret = kDNSServiceErr_Unknown;
 736     int error;
 737     DNSServiceRef sdref = NULL;
 738     AvahiIfIndex ifindex;
 739
 740     AVAHI_WARN_LINKAGE;
 741
 742     if (!ret_sdref)
 743         return kDNSServiceErr_BadParam;
 744     *ret_sdref = NULL;
 745
 746     assert(name);
 747     assert(regtype);
 748     assert(domain);
 749     assert(callback);
 750
 751     if (interface == kDNSServiceInterfaceIndexLocalOnly || flags != 0) {
 752         AVAHI_WARN_UNSUPPORTED;
 753         return kDNSServiceErr_Unsupported;
 754     }
 755
 756     if (!(sdref = sdref_new()))
 757         return kDNSServiceErr_Unknown;
 758
 759     sdref->context = context;
 760     sdref->service_resolver_callback = callback;
 761
 762     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 763
 764     if (!(sdref->client = avahi_client_new(avahi_simple_poll_get(sdref->simple_poll), 0, generic_client_callback, sdref, &error))) {
 765         ret =  map_error(error);
 766         goto finish;
 767     }
 768
 769     ifindex = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
 770
 771     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))) {
 772         ret = map_error(avahi_client_errno(sdref->client));
 773         goto finish;
 774     }
 775
 776
 777     ret = kDNSServiceErr_NoError;
 778     *ret_sdref = sdref;
 779
 780 finish:
 781
 782     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 783
 784     if (ret != kDNSServiceErr_NoError)
 785         DNSServiceRefDeallocate(sdref);
 786
 787     return ret;
 788 }
 789
 790 int DNSSD_API DNSServiceConstructFullName (
 791     char *fullName,
 792     const char *service,
 793     const char *regtype,
 794     const char *domain) {
 795
 796     AVAHI_WARN_LINKAGE;
 797
 798     assert(fullName);
 799     assert(regtype);
 800     assert(domain);
 801
 802     if (avahi_service_name_join(fullName, kDNSServiceMaxDomainName, service, regtype, domain) < 0)
 803         return -1;
 804
 805     return 0;
 806 }
 807
 808 static void domain_browser_callback(
 809     AvahiDomainBrowser *b,
 810     AvahiIfIndex interface,
 811     AVAHI_GCC_UNUSED AvahiProtocol protocol,
 812     AvahiBrowserEvent event,
 813     const char *domain,
 814     AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
 815     void *userdata) {
 816
 817     DNSServiceRef sdref = userdata;
 818     static char domain_fixed[AVAHI_DOMAIN_NAME_MAX];
 819
 820     assert(b);
 821     assert(sdref);
 822     assert(sdref->n_ref >= 1);
 823
 824     domain  = add_trailing_dot(domain, domain_fixed, sizeof(domain_fixed));
 825
 826     switch (event) {
 827         case AVAHI_BROWSER_NEW:
 828             sdref->domain_browser_callback(sdref, kDNSServiceFlagsAdd, interface, kDNSServiceErr_NoError, domain, sdref->context);
 829             break;
 830
 831         case AVAHI_BROWSER_REMOVE:
 832             sdref->domain_browser_callback(sdref, 0, interface, kDNSServiceErr_NoError, domain, sdref->context);
 833             break;
 834
 835         case AVAHI_BROWSER_FAILURE:
 836             sdref->domain_browser_callback(sdref, 0, interface, map_error(avahi_client_errno(sdref->client)), domain, sdref->context);
 837             break;
 838
 839         case AVAHI_BROWSER_CACHE_EXHAUSTED:
 840         case AVAHI_BROWSER_ALL_FOR_NOW:
 841             break;
 842     }
 843 }
 844
 845 DNSServiceErrorType DNSSD_API DNSServiceEnumerateDomains(
 846     DNSServiceRef *ret_sdref,
 847     DNSServiceFlags flags,
 848     uint32_t interface,
 849     DNSServiceDomainEnumReply callback,
 850     void *context) {
 851
 852     DNSServiceErrorType ret = kDNSServiceErr_Unknown;
 853     int error;
 854     DNSServiceRef sdref = NULL;
 855     AvahiIfIndex ifindex;
 856
 857     AVAHI_WARN_LINKAGE;
 858
 859     if (!ret_sdref)
 860         return kDNSServiceErr_BadParam;
 861     *ret_sdref = NULL;
 862
 863     assert(callback);
 864
 865     if (interface == kDNSServiceInterfaceIndexLocalOnly ||
 866         (flags != kDNSServiceFlagsBrowseDomains &&  flags != kDNSServiceFlagsRegistrationDomains)) {
 867         AVAHI_WARN_UNSUPPORTED;
 868         return kDNSServiceErr_Unsupported;
 869     }
 870
 871     if (!(sdref = sdref_new()))
 872         return kDNSServiceErr_Unknown;
 873
 874     sdref->context = context;
 875     sdref->domain_browser_callback = callback;
 876
 877     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 878
 879     if (!(sdref->client = avahi_client_new(avahi_simple_poll_get(sdref->simple_poll), 0, generic_client_callback, sdref, &error))) {
 880         ret =  map_error(error);
 881         goto finish;
 882     }
 883
 884     ifindex = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
 885
 886     if (!(sdref->domain_browser = avahi_domain_browser_new(sdref->client, ifindex, AVAHI_PROTO_UNSPEC, "local",
 887                                                            flags == kDNSServiceFlagsRegistrationDomains ? AVAHI_DOMAIN_BROWSER_REGISTER : AVAHI_DOMAIN_BROWSER_BROWSE,
 888                                                            0, domain_browser_callback, sdref))) {
 889         ret = map_error(avahi_client_errno(sdref->client));
 890         goto finish;
 891     }
 892
 893     ret = kDNSServiceErr_NoError;
 894     *ret_sdref = sdref;
 895
 896 finish:
 897
 898     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 899
 900     if (ret != kDNSServiceErr_NoError)
 901         DNSServiceRefDeallocate(sdref);
 902
 903     return ret;
 904 }
 905
 906 static void reg_report_error(DNSServiceRef sdref, DNSServiceErrorType error) {
 907     char regtype_fixed[AVAHI_DOMAIN_NAME_MAX], domain_fixed[AVAHI_DOMAIN_NAME_MAX];
 908     const char *regtype, *domain;
 909     assert(sdref);
 910     assert(sdref->n_ref >= 1);
 911
 912     if (!sdref->service_register_callback)
 913         return;
 914
 915     regtype = add_trailing_dot(sdref->type_info.type, regtype_fixed, sizeof(regtype_fixed));
 916     domain = add_trailing_dot(sdref->service_domain, domain_fixed, sizeof(domain_fixed));
 917
 918     sdref->service_register_callback(
 919         sdref, 0, error,
 920         sdref->service_name_chosen ? sdref->service_name_chosen : sdref->service_name,
 921         regtype,
 922         domain,
 923         sdref->context);
 924 }
 925
 926 static int reg_create_service(DNSServiceRef sdref) {
 927     int ret;
 928     AvahiStringList *l;
 929
 930     assert(sdref);
 931     assert(sdref->n_ref >= 1);
 932
 933     if ((ret = avahi_entry_group_add_service_strlst(
 934         sdref->entry_group,
 935         sdref->service_interface,
 936         AVAHI_PROTO_UNSPEC,
 937         0,
 938         sdref->service_name_chosen,
 939         sdref->type_info.type,
 940         sdref->service_domain,
 941         sdref->service_host,
 942         sdref->service_port,
 943         sdref->service_txt)) < 0)
 944         return ret;
 945
 946     for (l = sdref->type_info.subtypes; l; l = l->next) {
 947         /* Create a subtype entry */
 948
 949         if (avahi_entry_group_add_service_subtype(
 950                 sdref->entry_group,
 951                 sdref->service_interface,
 952                 AVAHI_PROTO_UNSPEC,
 953                 0,
 954                 sdref->service_name_chosen,
 955                 sdref->type_info.type,
 956                 sdref->service_domain,
 957                 (const char*) l->text) < 0)
 958             return ret;
 959     }
 960
 961     if ((ret = avahi_entry_group_commit(sdref->entry_group)) < 0)
 962         return ret;
 963
 964     return 0;
 965 }
 966
 967 static void reg_client_callback(AvahiClient *s, AvahiClientState state, void* userdata) {
 968     DNSServiceRef sdref = userdata;
 969
 970     assert(s);
 971     assert(sdref);
 972     assert(sdref->n_ref >= 1);
 973
 974     /* We've not been setup completely */
 975     if (!sdref->entry_group)
 976         return;
 977
 978     switch (state) {
 979         case AVAHI_CLIENT_FAILURE:
 980             reg_report_error(sdref, kDNSServiceErr_Unknown);
 981             break;
 982
 983         case AVAHI_CLIENT_S_RUNNING: {
 984             int ret;
 985
 986             if (!sdref->service_name) {
 987                 const char *n;
 988                 /* If the service name is taken from the host name, copy that */
 989
 990                 avahi_free(sdref->service_name_chosen);
 991                 sdref->service_name_chosen = NULL;
 992
 993                 if (!(n = avahi_client_get_host_name(sdref->client))) {
 994                     reg_report_error(sdref, map_error(avahi_client_errno(sdref->client)));
 995                     return;
 996                 }
 997
 998                 if (!(sdref->service_name_chosen = avahi_strdup(n))) {
 999                     reg_report_error(sdref, kDNSServiceErr_NoMemory);
1000                     return;
1001                 }
1002             }
1003
1004             /* Register the service */
1005
1006             if ((ret = reg_create_service(sdref)) < 0) {
1007                 reg_report_error(sdref, map_error(ret));
1008                 return;
1009             }
1010
1011             break;
1012         }
1013
1014         case AVAHI_CLIENT_S_COLLISION:
1015         case AVAHI_CLIENT_S_REGISTERING:
1016
1017             /* Remove our entry */
1018             avahi_entry_group_reset(sdref->entry_group);
1019
1020             break;
1021
1022         case AVAHI_CLIENT_CONNECTING:
1023             /* Ignore */
1024             break;
1025     }
1026
1027 }
1028
1029 static void reg_entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
1030     DNSServiceRef sdref = userdata;
1031
1032     assert(g);
1033
1034     switch (state) {
1035         case AVAHI_ENTRY_GROUP_ESTABLISHED:
1036
1037             /* Inform the user */
1038             reg_report_error(sdref, kDNSServiceErr_NoError);
1039
1040             break;
1041
1042         case AVAHI_ENTRY_GROUP_COLLISION: {
1043             char *n;
1044             int ret;
1045
1046             /* Remove our entry */
1047             avahi_entry_group_reset(sdref->entry_group);
1048
1049             assert(sdref->service_name_chosen);
1050
1051             /* Pick a new name */
1052             if (!(n = avahi_alternative_service_name(sdref->service_name_chosen))) {
1053                 reg_report_error(sdref, kDNSServiceErr_NoMemory);
1054                 return;
1055             }
1056             avahi_free(sdref->service_name_chosen);
1057             sdref->service_name_chosen = n;
1058
1059             /* Register the service with that new name */
1060             if ((ret = reg_create_service(sdref)) < 0) {
1061                 reg_report_error(sdref, map_error(ret));
1062                 return;
1063             }
1064
1065             break;
1066         }
1067
1068         case AVAHI_ENTRY_GROUP_REGISTERING:
1069         case AVAHI_ENTRY_GROUP_UNCOMMITED:
1070             /* Ignore */
1071             break;
1072
1073         case AVAHI_ENTRY_GROUP_FAILURE:
1074             /* Inform the user */
1075             reg_report_error(sdref, map_error(avahi_client_errno(sdref->client)));
1076             break;
1077
1078     }
1079 }
1080
1081 DNSServiceErrorType DNSSD_API DNSServiceRegister (
1082         DNSServiceRef *ret_sdref,
1083         DNSServiceFlags flags,
1084         uint32_t interface,
1085         const char *name,
1086         const char *regtype,
1087         const char *domain,
1088         const char *host,
1089         uint16_t port,
1090         uint16_t txtLen,
1091         const void *txtRecord,
1092         DNSServiceRegisterReply callback,
1093         void *context) {
1094
1095     DNSServiceErrorType ret = kDNSServiceErr_Unknown;
1096     int error;
1097     DNSServiceRef sdref = NULL;
1098     AvahiStringList *txt = NULL;
1099     struct type_info type_info;
1100
1101     AVAHI_WARN_LINKAGE;
1102
1103     if (!ret_sdref)
1104         return kDNSServiceErr_BadParam;
1105     *ret_sdref = NULL;
1106
1107     if (!regtype)
1108             return kDNSServiceErr_BadParam;
1109
1110     assert(txtRecord || txtLen == 0);
1111
1112     if (interface == kDNSServiceInterfaceIndexLocalOnly || flags) {
1113         AVAHI_WARN_UNSUPPORTED;
1114         return kDNSServiceErr_Unsupported;
1115     }
1116
1117     if (txtLen > 0)
1118         if (avahi_string_list_parse(txtRecord, txtLen, &txt) < 0)
1119             return kDNSServiceErr_Invalid;
1120
1121     if (type_info_parse(&type_info, regtype) < 0) {
1122         avahi_string_list_free(txt);
1123         return kDNSServiceErr_Invalid;
1124     }
1125
1126     if (!(sdref = sdref_new())) {
1127         avahi_string_list_free(txt);
1128         type_info_free(&type_info);
1129         return kDNSServiceErr_Unknown;
1130     }
1131
1132     sdref->context = context;
1133     sdref->service_register_callback = callback;
1134
1135     sdref->type_info = type_info;
1136     sdref->service_name = avahi_strdup(name);
1137     sdref->service_domain = domain ? avahi_normalize_name_strdup(domain) : NULL;
1138     sdref->service_host = host ? avahi_normalize_name_strdup(host) : NULL;
1139     sdref->service_interface = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
1140     sdref->service_port = ntohs(port);
1141     sdref->service_txt = txt;
1142
1143     /* Some OOM checking would be cool here */
1144
1145     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
1146
1147     if (!(sdref->client = avahi_client_new(avahi_simple_poll_get(sdref->simple_poll), 0, reg_client_callback, sdref, &error))) {
1148         ret =  map_error(error);
1149         goto finish;
1150     }
1151
1152     if (!sdref->service_domain) {
1153         const char *d;
1154
1155         if (!(d = avahi_client_get_domain_name(sdref->client))) {
1156             ret = map_error(avahi_client_errno(sdref->client));
1157             goto finish;
1158         }
1159
1160         if (!(sdref->service_domain = avahi_strdup(d))) {
1161             ret = kDNSServiceErr_NoMemory;
1162             goto finish;
1163         }
1164     }
1165
1166     if (!(sdref->entry_group = avahi_entry_group_new(sdref->client, reg_entry_group_callback, sdref))) {
1167         ret = map_error(avahi_client_errno(sdref->client));
1168         goto finish;
1169     }
1170
1171     if (avahi_client_get_state(sdref->client) == AVAHI_CLIENT_S_RUNNING) {
1172         const char *n;
1173
1174         if (sdref->service_name)
1175             n = sdref->service_name;
1176         else {
1177             if (!(n = avahi_client_get_host_name(sdref->client))) {
1178                 ret = map_error(avahi_client_errno(sdref->client));
1179                 goto finish;
1180             }
1181         }
1182
1183         if (!(sdref->service_name_chosen = avahi_strdup(n))) {
1184             ret = kDNSServiceErr_NoMemory;
1185             goto finish;
1186         }
1187
1188
1189         if ((error = reg_create_service(sdref)) < 0) {
1190             ret = map_error(error);
1191             goto finish;
1192         }
1193     }
1194
1195     ret = kDNSServiceErr_NoError;
1196     *ret_sdref = sdref;
1197
1198 finish:
1199
1200     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
1201
1202     if (ret != kDNSServiceErr_NoError)
1203         DNSServiceRefDeallocate(sdref);
1204
1205     return ret;
1206 }
1207
1208 DNSServiceErrorType DNSSD_API DNSServiceUpdateRecord(
1209          DNSServiceRef sdref,
1210          DNSRecordRef rref,
1211          DNSServiceFlags flags,
1212          uint16_t rdlen,
1213          const void *rdata,
1214          AVAHI_GCC_UNUSED uint32_t ttl) {
1215
1216     int ret = kDNSServiceErr_Unknown;
1217     AvahiStringList *txt = NULL;
1218
1219     AVAHI_WARN_LINKAGE;
1220
1221     if (!sdref || sdref->n_ref <= 0)
1222         return kDNSServiceErr_BadParam;
1223
1224     if (flags || rref) {
1225         AVAHI_WARN_UNSUPPORTED;
1226         return kDNSServiceErr_Unsupported;
1227     }
1228
1229     if (rdlen > 0)
1230         if (avahi_string_list_parse(rdata, rdlen, &txt) < 0)
1231             return kDNSServiceErr_Invalid;
1232
1233     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
1234
1235     if (!avahi_string_list_equal(txt, sdref->service_txt)) {
1236
1237         avahi_string_list_free(sdref->service_txt);
1238         sdref->service_txt = txt;
1239
1240         if (avahi_client_get_state(sdref->client) == AVAHI_CLIENT_S_RUNNING &&
1241             sdref->entry_group &&
1242             (avahi_entry_group_get_state(sdref->entry_group) == AVAHI_ENTRY_GROUP_ESTABLISHED ||
1243             avahi_entry_group_get_state(sdref->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING))
1244
1245             if (avahi_entry_group_update_service_txt_strlst(
1246                         sdref->entry_group,
1247                         sdref->service_interface,
1248                         AVAHI_PROTO_UNSPEC,
1249                         0,
1250                         sdref->service_name_chosen,
1251                         sdref->type_info.type,
1252                         sdref->service_domain,
1253                         sdref->service_txt) < 0) {
1254
1255                 ret = map_error(avahi_client_errno(sdref->client));
1256                 goto finish;
1257             }
1258
1259     } else
1260         avahi_string_list_free(txt);
1261
1262     ret = kDNSServiceErr_NoError;
1263
1264 finish:
1265     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
1266
1267     return ret;
1268 }
1269