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_POLL_DONE = 'P'
  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                 if (avahi_simple_poll_run(sdref->simple_poll) < 0) {
 230                     fprintf(stderr, __FILE__": avahi_simple_poll_run() failed.\n");
 231                     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 232                     break;
 233                 }
 234
 235                 ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 236
 237                 if (write_command(sdref->thread_fd, COMMAND_POLL_DONE) < 0)
 238                     break;
 239
 240                 break;
 241
 242             case COMMAND_QUIT:
 243                 return NULL;
 244         }
 245
 246     }
 247
 248     return NULL;
 249 }
 250
 251 static DNSServiceRef sdref_new(void) {
 252     int fd[2] = { -1, -1 };
 253     DNSServiceRef sdref = NULL;
 254     pthread_mutexattr_t mutex_attr;
 255
 256     if (socketpair(AF_UNIX, SOCK_STREAM, 0, fd) < 0)
 257         goto fail;
 258
 259     if (!(sdref = avahi_new(struct _DNSServiceRef_t, 1)))
 260         goto fail;
 261
 262     sdref->n_ref = 1;
 263     sdref->thread_fd = fd[0];
 264     sdref->main_fd = fd[1];
 265
 266     sdref->client = NULL;
 267     sdref->service_browser = NULL;
 268     sdref->service_resolver = NULL;
 269     sdref->domain_browser = NULL;
 270     sdref->entry_group = NULL;
 271
 272     sdref->service_name = sdref->service_name_chosen = sdref->service_regtype = sdref->service_domain = sdref->service_host = NULL;
 273     sdref->service_txt = NULL;
 274
 275     ASSERT_SUCCESS(pthread_mutexattr_init(&mutex_attr));
 276     pthread_mutexattr_settype(&mutex_attr, PTHREAD_MUTEX_RECURSIVE);
 277     ASSERT_SUCCESS(pthread_mutex_init(&sdref->mutex, &mutex_attr));
 278
 279     sdref->thread_running = 0;
 280
 281     if (!(sdref->simple_poll = avahi_simple_poll_new()))
 282         goto fail;
 283
 284     avahi_simple_poll_set_func(sdref->simple_poll, poll_func, sdref);
 285
 286     /* Start simple poll */
 287     if (avahi_simple_poll_prepare(sdref->simple_poll, -1) < 0)
 288         goto fail;
 289
 290     /* Queue an initial POLL command for the thread */
 291     if (write_command(sdref->main_fd, COMMAND_POLL) < 0)
 292         goto fail;
 293
 294     if (pthread_create(&sdref->thread, NULL, thread_func, sdref) != 0)
 295         goto fail;
 296
 297     sdref->thread_running = 1;
 298
 299     return sdref;
 300
 301 fail:
 302
 303     if (sdref)
 304         DNSServiceRefDeallocate(sdref);
 305
 306     return NULL;
 307 }
 308
 309 static void sdref_free(DNSServiceRef sdref) {
 310     assert(sdref);
 311
 312     if (sdref->thread_running) {
 313         ASSERT_SUCCESS(write_command(sdref->main_fd, COMMAND_QUIT));
 314         avahi_simple_poll_wakeup(sdref->simple_poll);
 315         ASSERT_SUCCESS(pthread_join(sdref->thread, NULL));
 316     }
 317
 318     if (sdref->client)
 319         avahi_client_free(sdref->client);
 320
 321     if (sdref->simple_poll)
 322         avahi_simple_poll_free(sdref->simple_poll);
 323
 324
 325     if (sdref->thread_fd >= 0)
 326         close(sdref->thread_fd);
 327
 328     if (sdref->main_fd >= 0)
 329         close(sdref->main_fd);
 330
 331     ASSERT_SUCCESS(pthread_mutex_destroy(&sdref->mutex));
 332
 333     avahi_free(sdref->service_name);
 334     avahi_free(sdref->service_name_chosen);
 335     avahi_free(sdref->service_regtype);
 336     avahi_free(sdref->service_domain);
 337     avahi_free(sdref->service_host);
 338
 339     avahi_string_list_free(sdref->service_txt);
 340
 341     avahi_free(sdref);
 342 }
 343
 344 static void sdref_ref(DNSServiceRef sdref) {
 345     assert(sdref);
 346     assert(sdref->n_ref >= 1);
 347
 348     sdref->n_ref++;
 349 }
 350
 351 static void sdref_unref(DNSServiceRef sdref) {
 352     assert(sdref);
 353     assert(sdref->n_ref >= 1);
 354
 355     if (--(sdref->n_ref) <= 0)
 356         sdref_free(sdref);
 357 }
 358
 359 int DNSSD_API DNSServiceRefSockFD(DNSServiceRef sdref) {
 360     assert(sdref);
 361     assert(sdref->n_ref >= 1);
 362
 363     AVAHI_WARN_LINKAGE;
 364
 365     return sdref->main_fd;
 366 }
 367
 368 DNSServiceErrorType DNSSD_API DNSServiceProcessResult(DNSServiceRef sdref) {
 369     DNSServiceErrorType ret = kDNSServiceErr_Unknown;
 370
 371     assert(sdref);
 372     assert(sdref->n_ref >= 1);
 373
 374     AVAHI_WARN_LINKAGE;
 375
 376     sdref_ref(sdref);
 377
 378     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 379
 380     /* Cleanup notification socket */
 381     if (read_command(sdref->main_fd) != COMMAND_POLL_DONE)
 382         goto finish;
 383
 384     if (avahi_simple_poll_dispatch(sdref->simple_poll) < 0)
 385         goto finish;
 386
 387     if (sdref->n_ref > 1) /* Perhaps we should die */
 388
 389         /* Dispatch events */
 390         if (avahi_simple_poll_prepare(sdref->simple_poll, -1) < 0)
 391             goto finish;
 392
 393     if (sdref->n_ref > 1)
 394
 395         /* Request the poll */
 396         if (write_command(sdref->main_fd, COMMAND_POLL) < 0)
 397             goto finish;
 398
 399     ret = kDNSServiceErr_NoError;
 400
 401 finish:
 402
 403     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 404
 405     sdref_unref(sdref);
 406
 407     return ret;
 408 }
 409
 410 void DNSSD_API DNSServiceRefDeallocate(DNSServiceRef sdref) {
 411     assert(sdref);
 412     assert(sdref->n_ref >= 1);
 413
 414     AVAHI_WARN_LINKAGE;
 415
 416     sdref_unref(sdref);
 417 }
 418
 419 static void service_browser_callback(
 420     AvahiServiceBrowser *b,
 421     AvahiIfIndex interface,
 422     AvahiProtocol protocol,
 423     AvahiBrowserEvent event,
 424     const char *name,
 425     const char *type,
 426     const char *domain,
 427     AvahiLookupResultFlags flags,
 428     void *userdata) {
 429
 430     DNSServiceRef sdref = userdata;
 431     char type_fixed[AVAHI_DOMAIN_NAME_MAX], domain_fixed[AVAHI_DOMAIN_NAME_MAX];
 432     assert(b);
 433     assert(sdref);
 434     assert(sdref->n_ref >= 1);
 435
 436     type = add_trailing_dot(type, type_fixed, sizeof(type_fixed));
 437     domain  = add_trailing_dot(domain, domain_fixed, sizeof(domain_fixed));
 438
 439     switch (event) {
 440         case AVAHI_BROWSER_NEW:
 441             sdref->service_browser_callback(sdref, kDNSServiceFlagsAdd, interface, kDNSServiceErr_NoError, name, type, domain, sdref->context);
 442             break;
 443
 444         case AVAHI_BROWSER_REMOVE:
 445             sdref->service_browser_callback(sdref, 0, interface, kDNSServiceErr_NoError, name, type, domain, sdref->context);
 446             break;
 447
 448         case AVAHI_BROWSER_FAILURE:
 449             sdref->service_browser_callback(sdref, 0, interface, map_error(avahi_client_errno(sdref->client)), NULL, NULL, NULL, sdref->context);
 450             break;
 451
 452         case AVAHI_BROWSER_CACHE_EXHAUSTED:
 453         case AVAHI_BROWSER_ALL_FOR_NOW:
 454             break;
 455     }
 456 }
 457
 458 static void generic_client_callback(AvahiClient *s, AvahiClientState state, void* userdata) {
 459     DNSServiceRef sdref = userdata;
 460
 461     assert(s);
 462     assert(sdref);
 463     assert(sdref->n_ref >= 1);
 464
 465     switch (state) {
 466         case AVAHI_CLIENT_DISCONNECTED: {
 467
 468             if (sdref->service_browser_callback)
 469                 sdref->service_browser_callback(sdref, 0, 0, kDNSServiceErr_Unknown, NULL, NULL, NULL, sdref->context);
 470             else if (sdref->service_resolver_callback)
 471                 sdref->service_resolver_callback(sdref, 0, 0, kDNSServiceErr_Unknown, NULL, NULL, 0, 0, NULL, sdref->context);
 472             else if (sdref->domain_browser_callback)
 473                 sdref->domain_browser_callback(sdref, 0, 0, kDNSServiceErr_Unknown, NULL, sdref->context);
 474
 475             break;
 476         }
 477
 478         case AVAHI_CLIENT_S_RUNNING:
 479         case AVAHI_CLIENT_S_COLLISION:
 480         case AVAHI_CLIENT_S_INVALID:
 481         case AVAHI_CLIENT_S_REGISTERING:
 482             break;
 483     }
 484 }
 485
 486 DNSServiceErrorType DNSSD_API DNSServiceBrowse(
 487     DNSServiceRef *ret_sdref,
 488     DNSServiceFlags flags,
 489     uint32_t interface,
 490     const char *regtype,
 491     const char *domain,
 492     DNSServiceBrowseReply callback,
 493     void *context) {
 494
 495     DNSServiceErrorType ret = kDNSServiceErr_Unknown;
 496     int error;
 497     DNSServiceRef sdref = NULL;
 498     AvahiIfIndex ifindex;
 499
 500     AVAHI_WARN_LINKAGE;
 501
 502     assert(ret_sdref);
 503     assert(regtype);
 504     assert(domain);
 505     assert(callback);
 506
 507     if (interface == kDNSServiceInterfaceIndexLocalOnly || flags != 0) {
 508         AVAHI_WARN_UNSUPPORTED;
 509         return kDNSServiceErr_Unsupported;
 510     }
 511
 512     if (!(sdref = sdref_new()))
 513         return kDNSServiceErr_Unknown;
 514
 515     sdref->context = context;
 516     sdref->service_browser_callback = callback;
 517
 518     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 519
 520     if (!(sdref->client = avahi_client_new(avahi_simple_poll_get(sdref->simple_poll), generic_client_callback, sdref, &error))) {
 521         ret =  map_error(error);
 522         goto finish;
 523     }
 524
 525     ifindex = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
 526
 527     if (!(sdref->service_browser = avahi_service_browser_new(sdref->client, ifindex, AVAHI_PROTO_UNSPEC, regtype, domain, 0, service_browser_callback, sdref))) {
 528         ret = map_error(avahi_client_errno(sdref->client));
 529         goto finish;
 530     }
 531
 532     ret = kDNSServiceErr_NoError;
 533     *ret_sdref = sdref;
 534
 535 finish:
 536
 537     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 538
 539     if (ret != kDNSServiceErr_NoError)
 540         DNSServiceRefDeallocate(sdref);
 541
 542     return ret;
 543 }
 544
 545 static void service_resolver_callback(
 546     AvahiServiceResolver *r,
 547     AvahiIfIndex interface,
 548     AvahiProtocol protocol,
 549     AvahiResolverEvent event,
 550     const char *name,
 551     const char *type,
 552     const char *domain,
 553     const char *host_name,
 554     const AvahiAddress *a,
 555     uint16_t port,
 556     AvahiStringList *txt,
 557     AvahiLookupResultFlags flags,
 558     void *userdata) {
 559
 560     DNSServiceRef sdref = userdata;
 561
 562     assert(r);
 563     assert(sdref);
 564     assert(sdref->n_ref >= 1);
 565
 566     switch (event) {
 567         case AVAHI_RESOLVER_FOUND: {
 568
 569             char host_name_fixed[AVAHI_DOMAIN_NAME_MAX];
 570             char full_name[AVAHI_DOMAIN_NAME_MAX];
 571             int ret;
 572             char *p = NULL;
 573             size_t l = 0;
 574
 575             host_name = add_trailing_dot(host_name, host_name_fixed, sizeof(host_name_fixed));
 576
 577             if ((p = avahi_new0(char, (l = avahi_string_list_serialize(txt, NULL, 0))+1)))
 578                 avahi_string_list_serialize(txt, p, l);
 579
 580             ret = avahi_service_name_join(full_name, sizeof(full_name), name, type, domain);
 581             assert(ret == AVAHI_OK);
 582
 583             strcat(full_name, ".");
 584
 585             sdref->service_resolver_callback(sdref, 0, interface, kDNSServiceErr_NoError, full_name, host_name, htons(port), l, p, sdref->context);
 586
 587             avahi_free(p);
 588             break;
 589         }
 590
 591         case AVAHI_RESOLVER_FAILURE:
 592             sdref->service_resolver_callback(sdref, 0, interface, map_error(avahi_client_errno(sdref->client)), NULL, NULL, 0, 0, NULL, sdref->context);
 593             break;
 594     }
 595 }
 596
 597 DNSServiceErrorType DNSSD_API DNSServiceResolve(
 598     DNSServiceRef *ret_sdref,
 599     DNSServiceFlags flags,
 600     uint32_t interface,
 601     const char *name,
 602     const char *regtype,
 603     const char *domain,
 604     DNSServiceResolveReply callback,
 605     void *context) {
 606
 607     DNSServiceErrorType ret = kDNSServiceErr_Unknown;
 608     int error;
 609     DNSServiceRef sdref = NULL;
 610     AvahiIfIndex ifindex;
 611
 612     AVAHI_WARN_LINKAGE;
 613
 614     assert(ret_sdref);
 615     assert(name);
 616     assert(regtype);
 617     assert(domain);
 618     assert(callback);
 619
 620     if (interface == kDNSServiceInterfaceIndexLocalOnly || flags != 0) {
 621         AVAHI_WARN_UNSUPPORTED;
 622         return kDNSServiceErr_Unsupported;
 623     }
 624
 625     if (!(sdref = sdref_new()))
 626         return kDNSServiceErr_Unknown;
 627
 628     sdref->context = context;
 629     sdref->service_resolver_callback = callback;
 630
 631     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 632
 633     if (!(sdref->client = avahi_client_new(avahi_simple_poll_get(sdref->simple_poll), generic_client_callback, sdref, &error))) {
 634         ret =  map_error(error);
 635         goto finish;
 636     }
 637
 638     ifindex = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
 639
 640     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))) {
 641         ret = map_error(avahi_client_errno(sdref->client));
 642         goto finish;
 643     }
 644
 645
 646     ret = kDNSServiceErr_NoError;
 647     *ret_sdref = sdref;
 648
 649 finish:
 650
 651     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 652
 653     if (ret != kDNSServiceErr_NoError)
 654         DNSServiceRefDeallocate(sdref);
 655
 656     return ret;
 657 }
 658
 659 int DNSSD_API DNSServiceConstructFullName (
 660     char *fullName,
 661     const char *service,
 662     const char *regtype,
 663     const char *domain) {
 664
 665     AVAHI_WARN_LINKAGE;
 666
 667     assert(fullName);
 668     assert(regtype);
 669     assert(domain);
 670
 671     if (avahi_service_name_join(fullName, kDNSServiceMaxDomainName, service, regtype, domain) < 0)
 672         return -1;
 673
 674     return 0;
 675 }
 676
 677 static void domain_browser_callback(
 678     AvahiDomainBrowser *b,
 679     AvahiIfIndex interface,
 680     AvahiProtocol protocol,
 681     AvahiBrowserEvent event,
 682     const char *domain,
 683     AvahiLookupResultFlags flags,
 684     void *userdata) {
 685
 686     DNSServiceRef sdref = userdata;
 687     static char domain_fixed[AVAHI_DOMAIN_NAME_MAX];
 688
 689     assert(b);
 690     assert(sdref);
 691     assert(sdref->n_ref >= 1);
 692
 693     domain  = add_trailing_dot(domain, domain_fixed, sizeof(domain_fixed));
 694
 695     switch (event) {
 696         case AVAHI_BROWSER_NEW:
 697             sdref->domain_browser_callback(sdref, kDNSServiceFlagsAdd, interface, kDNSServiceErr_NoError, domain, sdref->context);
 698             break;
 699
 700         case AVAHI_BROWSER_REMOVE:
 701             sdref->domain_browser_callback(sdref, 0, interface, kDNSServiceErr_NoError, domain, sdref->context);
 702             break;
 703
 704         case AVAHI_BROWSER_FAILURE:
 705             sdref->domain_browser_callback(sdref, 0, interface, map_error(avahi_client_errno(sdref->client)), domain, sdref->context);
 706             break;
 707
 708         case AVAHI_BROWSER_CACHE_EXHAUSTED:
 709         case AVAHI_BROWSER_ALL_FOR_NOW:
 710             break;
 711     }
 712 }
 713
 714 DNSServiceErrorType DNSSD_API DNSServiceEnumerateDomains(
 715     DNSServiceRef *ret_sdref,
 716     DNSServiceFlags flags,
 717     uint32_t interface,
 718     DNSServiceDomainEnumReply callback,
 719     void *context) {
 720
 721     DNSServiceErrorType ret = kDNSServiceErr_Unknown;
 722     int error;
 723     DNSServiceRef sdref = NULL;
 724     AvahiIfIndex ifindex;
 725
 726     AVAHI_WARN_LINKAGE;
 727
 728     assert(ret_sdref);
 729     assert(callback);
 730
 731     if (interface == kDNSServiceInterfaceIndexLocalOnly ||
 732         (flags != kDNSServiceFlagsBrowseDomains &&  flags != kDNSServiceFlagsRegistrationDomains)) {
 733         AVAHI_WARN_UNSUPPORTED;
 734         return kDNSServiceErr_Unsupported;
 735     }
 736
 737     if (!(sdref = sdref_new()))
 738         return kDNSServiceErr_Unknown;
 739
 740     sdref->context = context;
 741     sdref->domain_browser_callback = callback;
 742
 743     ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
 744
 745     if (!(sdref->client = avahi_client_new(avahi_simple_poll_get(sdref->simple_poll), generic_client_callback, sdref, &error))) {
 746         ret =  map_error(error);
 747         goto finish;
 748     }
 749
 750     ifindex = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
 751
 752     if (!(sdref->domain_browser = avahi_domain_browser_new(sdref->client, ifindex, AVAHI_PROTO_UNSPEC, "local",
 753                                                            flags == kDNSServiceFlagsRegistrationDomains ? AVAHI_DOMAIN_BROWSER_REGISTER : AVAHI_DOMAIN_BROWSER_BROWSE,
 754                                                            0, domain_browser_callback, sdref))) {
 755         ret = map_error(avahi_client_errno(sdref->client));
 756         goto finish;
 757     }
 758
 759     ret = kDNSServiceErr_NoError;
 760     *ret_sdref = sdref;
 761
 762 finish:
 763
 764     ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
 765
 766     if (ret != kDNSServiceErr_NoError)
 767         DNSServiceRefDeallocate(sdref);
 768
 769     return ret;
 770 }
 771
 772 static void reg_report_error(DNSServiceRef sdref, DNSServiceErrorType error) {
 773     char regtype_fixed[AVAHI_DOMAIN_NAME_MAX], domain_fixed[AVAHI_DOMAIN_NAME_MAX];
 774     const char *regtype, *domain;
 775     assert(sdref);
 776     assert(sdref->n_ref >= 1);
 777
 778     assert(sdref->service_register_callback);
 779
 780     regtype = add_trailing_dot(sdref->service_regtype, regtype_fixed, sizeof(regtype_fixed));
 781     domain = add_trailing_dot(sdref->service_domain, domain_fixed, sizeof(domain_fixed));
 782
 783     sdref->service_register_callback(
 784         sdref, 0, error,
 785         sdref->service_name_chosen ? sdref->service_name_chosen : sdref->service_name,
 786         regtype,
 787         domain,
 788         sdref->context);
 789 }
 790
 791 static int reg_create_service(DNSServiceRef sdref) {
 792     int ret;
 793     const char *real_type;
 794
 795     assert(sdref);
 796     assert(sdref->n_ref >= 1);
 797
 798     real_type = avahi_get_type_from_subtype(sdref->service_regtype);
 799
 800     if ((ret = avahi_entry_group_add_service_strlst(
 801         sdref->entry_group,
 802         sdref->service_interface,
 803         AVAHI_PROTO_UNSPEC,
 804         0,
 805         sdref->service_name_chosen,
 806         real_type ? real_type : sdref->service_regtype,
 807         sdref->service_domain,
 808         sdref->service_host,
 809         sdref->service_port,
 810         sdref->service_txt)) < 0)
 811         return ret;
 812
 813
 814     if (real_type) {
 815         /* Create a subtype entry */
 816
 817         if (avahi_entry_group_add_service_subtype(
 818                 sdref->entry_group,
 819                 sdref->service_interface,
 820                 AVAHI_PROTO_UNSPEC,
 821                 0,
 822                 sdref->service_name_chosen,
 823                 real_type,
 824                 sdref->service_domain,
 825                 sdref->service_regtype) < 0)
 826             return ret;
 827
 828     }
 829
 830     if ((ret = avahi_entry_group_commit(sdref->entry_group)) < 0)
 831         return ret;
 832
 833     return 0;
 834 }
 835
 836 static void reg_client_callback(AvahiClient *s, AvahiClientState state, void* userdata) {
 837     DNSServiceRef sdref = userdata;
 838
 839     assert(s);
 840     assert(sdref);
 841     assert(sdref->n_ref >= 1);
 842
 843     /* We've not been setup completely */
 844     if (!sdref->entry_group)
 845         return;
 846
 847     switch (state) {
 848         case AVAHI_CLIENT_DISCONNECTED:
 849
 850             reg_report_error(sdref, kDNSServiceErr_NoError);
 851             break;
 852
 853         case AVAHI_CLIENT_S_RUNNING: {
 854             int ret;
 855
 856             if (!sdref->service_name) {
 857                 const char *n;
 858                 /* If the service name is taken from the host name, copy that */
 859
 860                 avahi_free(sdref->service_name_chosen);
 861                 sdref->service_name_chosen = NULL;
 862
 863                 if (!(n = avahi_client_get_host_name(sdref->client))) {
 864                     reg_report_error(sdref, map_error(avahi_client_errno(sdref->client)));
 865                     return;
 866                 }
 867
 868                 if (!(sdref->service_name_chosen = avahi_strdup(n))) {
 869                     reg_report_error(sdref, kDNSServiceErr_NoMemory);
 870                     return;
 871                 }
 872             }
 873
 874             /* Register the service */
 875
 876             if ((ret = reg_create_service(sdref)) < 0) {
 877                 reg_report_error(sdref, map_error(ret));
 878                 return;
 879             }
 880
 881             break;
 882         }
 883
 884         case AVAHI_CLIENT_S_COLLISION:
 885
 886             /* Remove our entry */
 887             avahi_entry_group_reset(sdref->entry_group);
 888
 889             break;
 890
 891         case AVAHI_CLIENT_S_INVALID:
 892         case AVAHI_CLIENT_S_REGISTERING:
 893             /* Ignore */
 894             break;
 895     }
 896
 897 }
 898
 899 static void reg_entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
 900     DNSServiceRef sdref = userdata;
 901
 902     assert(g);
 903
 904     switch (state) {
 905         case AVAHI_ENTRY_GROUP_ESTABLISHED:
 906             /* Inform the user */
 907             reg_report_error(sdref, kDNSServiceErr_NoError);
 908
 909             break;
 910
 911         case AVAHI_ENTRY_GROUP_COLLISION: {
 912             char *n;
 913             int ret;
 914
 915             /* Remove our entry */
 916             avahi_entry_group_reset(sdref->entry_group);
 917
 918             assert(sdref->service_name_chosen);
 919
 920             /* Pick a new name */
 921             if (!(n = avahi_alternative_service_name(sdref->service_name_chosen))) {
 922                 reg_report_error(sdref, kDNSServiceErr_NoMemory);
 923                 return;
 924             }
 925             avahi_free(sdref->service_name_chosen);
 926             sdref->service_name_chosen = n;
 927
 928             /* Register the service with that new name */
 929             if ((ret = reg_create_service(sdref)) < 0) {
 930                 reg_report_error(sdref, map_error(ret));
 931                 return;
 932             }
 933
 934             break;
 935         }
 936
 937         case AVAHI_ENTRY_GROUP_REGISTERING:
 938         case AVAHI_ENTRY_GROUP_UNCOMMITED:
 939             /* Ignore */
 940             break;
 941     }
 942 }
 943
 944 DNSServiceErrorType DNSSD_API DNSServiceRegister (
 945     DNSServiceRef *ret_sdref,
 946     DNSServiceFlags flags,
 947     uint32_t interface,
 948     const char *name,
 949     const char *regtype,
 950     const char *domain,
 951     const char *host,
 952     uint16_t port,
 953     uint16_t txtLen,
 954     const void *txtRecord,
 955     DNSServiceRegisterReply callback,
 956     void *context) {
 957
 958     DNSServiceErrorType ret = kDNSServiceErr_Unknown;
 959     int error;
 960     DNSServiceRef sdref = NULL;
 961
 962     AVAHI_WARN_LINKAGE;
 963
 964     assert(ret_sdref);
 965     assert(callback);
 966     assert(regtype);
 967
 968     if (interface == kDNSServiceInterfaceIndexLocalOnly || flags) {
 969         AVAHI_WARN_UNSUPPORTED;
 970         return kDNSServiceErr_Unsupported;
 971     }
 972
 973     if (!(sdref = sdref_new()))
 974         return kDNSServiceErr_Unknown;
 975
 976     sdref->context = context;
 977     sdref->service_register_callback = callback;
 978
 979     sdref->service_name = avahi_strdup(name);
 980     sdref->service_regtype = regtype ? avahi_normalize_name_strdup(regtype) : NULL;
 981     sdref->service_domain = domain ? avahi_normalize_name_strdup(domain) : NULL;
 982     sdref->service_host = host ? avahi_normalize_name_strdup(host) : NULL;
 983     sdref->service_interface = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
 984     sdref->service_port = ntohs(port);
 985     sdref->service_txt = txtRecord && txtLen > 0 ? avahi_string_list_parse(txtRecord, txtLen) : NULL;
 986
 987     /* Some OOM checking would be cool here */
 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