git.meshlink.io Git - catta/blob - avahi-compat-howl/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 <assert.h>
  27
  28 #include <pthread.h>
  29
  30 #include <avahi-common/strlst.h>
  31 #include <avahi-common/malloc.h>
  32 #include <avahi-common/domain.h>
  33 #include <avahi-common/simple-watch.h>
  34 #include <avahi-common/error.h>
  35 #include <avahi-common/llist.h>
  36 #include <avahi-client/client.h>
  37
  38 #include "howl.h"
  39 #include "warn.h"
  40
  41 #define OID_MAX 50
  42
  43 enum {
  44     COMMAND_POLL = 'p',
  45     COMMAND_QUIT = 'q',
  46     COMMAND_POLL_DONE = 'P',
  47     COMMAND_POLL_FAILED = 'F'
  48 };
  49
  50 typedef enum {
  51     OID_UNUSED = 0,
  52     OID_SERVICE_BROWSER,
  53     OID_SERVICE_RESOLVER,
  54     OID_DOMAIN_BROWSER,
  55     OID_ENTRY_GROUP
  56 } oid_type;
  57
  58 typedef struct service_data service_data;
  59
  60 typedef struct oid_data {
  61     oid_type type;
  62     sw_opaque extra;
  63     sw_discovery discovery;
  64     void *object;
  65     sw_result (*reply)(void);
  66     service_data *service_data;
  67 } oid_data;
  68
  69
  70 struct service_data {
  71     char *name, *regtype, *domain, *host;
  72     uint16_t port;
  73     AvahiIfIndex interface;
  74     AvahiStringList *txt;
  75     AVAHI_LLIST_FIELDS(service_data, services);
  76 };
  77
  78 struct _sw_discovery {
  79     int n_ref;
  80     AvahiSimplePoll *simple_poll;
  81     AvahiClient *client;
  82
  83     oid_data oid_table[OID_MAX];
  84     sw_discovery_oid oid_index;
  85
  86     int thread_fd, main_fd;
  87
  88     pthread_t thread;
  89     int thread_running;
  90
  91     pthread_mutex_t mutex;
  92
  93     AVAHI_LLIST_HEAD(service_data, services);
  94 };
  95
  96 #define ASSERT_SUCCESS(r) { int __ret = (r); assert(__ret == 0); }
  97
  98 #define OID_GET_INDEX(data) ((sw_discovery_oid) (((data) - ((data)->discovery->oid_table))))
  99
 100 static sw_discovery discovery_ref(sw_discovery self);
 101 static void discovery_unref(sw_discovery self);
 102
 103 static const char *add_trailing_dot(const char *s, char *buf, size_t buf_len) {
 104     if (!s)
 105         return NULL;
 106
 107     if (*s == 0)
 108         return s;
 109
 110     if (s[strlen(s)-1] == '.')
 111         return s;
 112
 113     snprintf(buf, buf_len, "%s.", s);
 114     return buf;
 115 }
 116
 117 static sw_result map_error(int error) {
 118     switch (error) {
 119         case AVAHI_OK:
 120             return SW_OKAY;
 121
 122         case AVAHI_ERR_NO_MEMORY:
 123             return SW_E_MEM;
 124     }
 125
 126     return SW_E_UNKNOWN;
 127 }
 128
 129 static int read_command(int fd) {
 130     ssize_t r;
 131     char command;
 132
 133     assert(fd >= 0);
 134
 135     if ((r = read(fd, &command, 1)) != 1) {
 136         fprintf(stderr, __FILE__": read() failed: %s\n", r < 0 ? strerror(errno) : "EOF");
 137         return -1;
 138     }
 139
 140     return command;
 141 }
 142
 143 static int write_command(int fd, char reply) {
 144     assert(fd >= 0);
 145
 146     if (write(fd, &reply, 1) != 1) {
 147         fprintf(stderr, __FILE__": write() failed: %s\n", strerror(errno));
 148         return -1;
 149     }
 150
 151     return 0;
 152 }
 153
 154 static int poll_func(struct pollfd *ufds, unsigned int nfds, int timeout, void *userdata) {
 155     sw_discovery self = userdata;
 156     int ret;
 157
 158     assert(self);
 159
 160     ASSERT_SUCCESS(pthread_mutex_unlock(&self->mutex));
 161     ret = poll(ufds, nfds, timeout);
 162     ASSERT_SUCCESS(pthread_mutex_lock(&self->mutex));
 163
 164     return ret;
 165 }
 166
 167 static void * thread_func(void *data) {
 168     sw_discovery self = data;
 169     sigset_t mask;
 170
 171     sigfillset(&mask);
 172     pthread_sigmask(SIG_BLOCK, &mask, NULL);
 173
 174     self->thread = pthread_self();
 175     self->thread_running = 1;
 176
 177     for (;;) {
 178         char command;
 179
 180         if ((command = read_command(self->thread_fd)) < 0)
 181             break;
 182
 183 /*         fprintf(stderr, "Command: %c\n", command); */
 184
 185         switch (command) {
 186
 187             case COMMAND_POLL: {
 188                 int ret;
 189
 190                 ASSERT_SUCCESS(pthread_mutex_lock(&self->mutex));
 191
 192                 for (;;) {
 193                     errno = 0;
 194
 195                     if ((ret = avahi_simple_poll_run(self->simple_poll)) < 0) {
 196
 197                         if (errno == EINTR)
 198                             continue;
 199
 200                         fprintf(stderr, __FILE__": avahi_simple_poll_run() failed: %s\n", strerror(errno));
 201                     }
 202
 203                     break;
 204                 }
 205
 206                 ASSERT_SUCCESS(pthread_mutex_unlock(&self->mutex));
 207
 208                 if (write_command(self->thread_fd, ret < 0 ? COMMAND_POLL_FAILED : COMMAND_POLL_DONE) < 0)
 209                     break;
 210
 211                 break;
 212             }
 213
 214             case COMMAND_QUIT:
 215                 return NULL;
 216         }
 217
 218     }
 219
 220     return NULL;
 221 }
 222
 223 static int oid_alloc(sw_discovery self, oid_type type) {
 224     sw_discovery_oid i;
 225     assert(self);
 226
 227     for (i = 0; i < OID_MAX; i++) {
 228
 229         while (self->oid_index >= OID_MAX)
 230             self->oid_index -= OID_MAX;
 231
 232         if (self->oid_table[self->oid_index].type == OID_UNUSED) {
 233             self->oid_table[self->oid_index].type = type;
 234             self->oid_table[self->oid_index].discovery = self;
 235
 236             assert(OID_GET_INDEX(&self->oid_table[self->oid_index]) == self->oid_index);
 237
 238             return self->oid_index ++;
 239         }
 240
 241         self->oid_index ++;
 242     }
 243
 244     /* No free entry found */
 245
 246     return (sw_discovery_oid) -1;
 247 }
 248
 249 static void oid_release(sw_discovery self, sw_discovery_oid oid) {
 250     assert(self);
 251     assert(oid < OID_MAX);
 252
 253     assert(self->oid_table[oid].type != OID_UNUSED);
 254
 255     self->oid_table[oid].type = OID_UNUSED;
 256     self->oid_table[oid].discovery = NULL;
 257     self->oid_table[oid].reply = NULL;
 258     self->oid_table[oid].object = NULL;
 259     self->oid_table[oid].extra = NULL;
 260     self->oid_table[oid].service_data = NULL;
 261 }
 262
 263 static oid_data* oid_get(sw_discovery self, sw_discovery_oid oid) {
 264     assert(self);
 265
 266     if (oid >= OID_MAX)
 267         return NULL;
 268
 269     if (self->oid_table[oid].type == OID_UNUSED)
 270         return NULL;
 271
 272     return &self->oid_table[oid];
 273 }
 274
 275 static service_data* service_data_new(sw_discovery self) {
 276     service_data *sdata;
 277
 278     assert(self);
 279
 280     if (!(sdata = avahi_new0(service_data, 1)))
 281         return NULL;
 282
 283     AVAHI_LLIST_PREPEND(service_data, services, self->services, sdata);
 284
 285     return sdata;
 286
 287 }
 288
 289 static void service_data_free(sw_discovery self, service_data* sdata) {
 290     assert(self);
 291     assert(sdata);
 292
 293     AVAHI_LLIST_REMOVE(service_data, services, self->services, sdata);
 294
 295     avahi_free(sdata->name);
 296     avahi_free(sdata->regtype);
 297     avahi_free(sdata->domain);
 298     avahi_free(sdata->host);
 299     avahi_string_list_free(sdata->txt);
 300     avahi_free(sdata);
 301 }
 302
 303 static void reg_client_callback(oid_data *data, AvahiClientState state);
 304
 305 static void client_callback(AvahiClient *s, AvahiClientState state, void* userdata) {
 306     sw_discovery self = userdata;
 307     sw_discovery_oid oid;
 308
 309     assert(s);
 310     assert(self);
 311
 312     discovery_ref(self);
 313
 314     for (oid = 0; oid < OID_MAX; oid++) {
 315
 316         switch (self->oid_table[oid].type) {
 317
 318             case OID_ENTRY_GROUP:
 319                 reg_client_callback(&self->oid_table[oid], state);
 320                 break;
 321
 322             case OID_DOMAIN_BROWSER:
 323             case OID_SERVICE_BROWSER:
 324                 ((sw_discovery_browse_reply) self->oid_table[oid].reply)(self, oid, SW_DISCOVERY_BROWSE_INVALID, 0, NULL, NULL, NULL, self->oid_table[oid].extra);
 325                 break;
 326
 327             case OID_SERVICE_RESOLVER:
 328             case OID_UNUSED:
 329                 ;
 330         }
 331     }
 332
 333     discovery_unref(self);
 334 }
 335
 336 sw_result sw_discovery_init(sw_discovery * self) {
 337     int fd[2] = { -1, -1};
 338     sw_result result = SW_E_UNKNOWN;
 339     pthread_mutexattr_t mutex_attr;
 340     int error;
 341
 342     assert(self);
 343
 344     AVAHI_WARN_LINKAGE;
 345
 346     *self = NULL;
 347
 348     if (socketpair(AF_UNIX, SOCK_STREAM, 0, fd) < 0)
 349         goto fail;
 350
 351     if (!(*self = avahi_new(struct _sw_discovery, 1))) {
 352         result = SW_E_MEM;
 353         goto fail;
 354     }
 355
 356     (*self)->n_ref = 1;
 357     (*self)->thread_fd = fd[0];
 358     (*self)->main_fd = fd[1];
 359
 360     (*self)->client = NULL;
 361     (*self)->simple_poll = NULL;
 362
 363     memset((*self)->oid_table, 0, sizeof((*self)->oid_table));
 364     (*self)->oid_index = 0;
 365
 366     (*self)->thread_running = 0;
 367
 368     AVAHI_LLIST_HEAD_INIT(service_info, (*self)->services);
 369
 370     ASSERT_SUCCESS(pthread_mutexattr_init(&mutex_attr));
 371     pthread_mutexattr_settype(&mutex_attr, PTHREAD_MUTEX_RECURSIVE);
 372     ASSERT_SUCCESS(pthread_mutex_init(&(*self)->mutex, &mutex_attr));
 373
 374     if (!((*self)->simple_poll = avahi_simple_poll_new()))
 375         goto fail;
 376
 377     avahi_simple_poll_set_func((*self)->simple_poll, poll_func, *self);
 378
 379     if (!((*self)->client = avahi_client_new(avahi_simple_poll_get((*self)->simple_poll), client_callback, *self, &error))) {
 380         result = map_error(error);
 381         goto fail;
 382     }
 383
 384     /* Start simple poll */
 385     if (avahi_simple_poll_prepare((*self)->simple_poll, -1) < 0)
 386         goto fail;
 387
 388     /* Queue an initial POLL command for the thread */
 389     if (write_command((*self)->main_fd, COMMAND_POLL) < 0)
 390         goto fail;
 391
 392     if (pthread_create(&(*self)->thread, NULL, thread_func, *self) != 0)
 393         goto fail;
 394
 395     (*self)->thread_running = 1;
 396
 397     return SW_OKAY;
 398
 399 fail:
 400
 401     if (*self)
 402         sw_discovery_fina(*self);
 403
 404     return result;
 405 }
 406
 407 static int stop_thread(sw_discovery self) {
 408     assert(self);
 409
 410     if (!self->thread_running)
 411         return 0;
 412
 413     if (write_command(self->main_fd, COMMAND_QUIT) < 0)
 414         return -1;
 415
 416     avahi_simple_poll_wakeup(self->simple_poll);
 417
 418     ASSERT_SUCCESS(pthread_join(self->thread, NULL));
 419     self->thread_running = 0;
 420     return 0;
 421 }
 422
 423 static sw_discovery discovery_ref(sw_discovery self) {
 424     assert(self);
 425     assert(self->n_ref >= 1);
 426
 427     self->n_ref++;
 428
 429     return self;
 430 }
 431
 432 static void discovery_unref(sw_discovery self) {
 433     assert(self);
 434     assert(self->n_ref >= 1);
 435
 436     if (--self->n_ref > 0)
 437         return;
 438
 439     stop_thread(self);
 440
 441     if (self->client)
 442         avahi_client_free(self->client);
 443
 444     if (self->simple_poll)
 445         avahi_simple_poll_free(self->simple_poll);
 446
 447     if (self->thread_fd >= 0)
 448         close(self->thread_fd);
 449
 450     if (self->main_fd >= 0)
 451         close(self->main_fd);
 452
 453     ASSERT_SUCCESS(pthread_mutex_destroy(&self->mutex));
 454
 455     while (self->services)
 456         service_data_free(self, self->services);
 457
 458     avahi_free(self);
 459 }
 460
 461 sw_result sw_discovery_fina(sw_discovery self) {
 462     assert(self);
 463
 464     AVAHI_WARN_LINKAGE;
 465
 466     stop_thread(self);
 467     discovery_unref(self);
 468
 469     return SW_OKAY;
 470 }
 471
 472 sw_result sw_discovery_run(sw_discovery self) {
 473     assert(self);
 474
 475     AVAHI_WARN_LINKAGE;
 476
 477     return sw_salt_run((sw_salt) self);
 478 }
 479
 480 sw_result sw_discovery_stop_run(sw_discovery self) {
 481     assert(self);
 482
 483     AVAHI_WARN_LINKAGE;
 484
 485     return sw_salt_stop_run((sw_salt) self);
 486 }
 487
 488 int sw_discovery_socket(sw_discovery self) {
 489     assert(self);
 490
 491     AVAHI_WARN_LINKAGE;
 492
 493     return self->main_fd;
 494 }
 495
 496 sw_result sw_discovery_read_socket(sw_discovery self) {
 497     sw_result result = SW_E_UNKNOWN;
 498
 499     assert(self);
 500
 501     discovery_ref(self);
 502
 503     ASSERT_SUCCESS(pthread_mutex_lock(&self->mutex));
 504
 505     /* Cleanup notification socket */
 506     if (read_command(self->main_fd) != COMMAND_POLL_DONE)
 507         goto finish;
 508
 509     if (avahi_simple_poll_dispatch(self->simple_poll) < 0)
 510         goto finish;
 511
 512     if (self->n_ref > 1) /* Perhaps we should die */
 513
 514         /* Dispatch events */
 515         if (avahi_simple_poll_prepare(self->simple_poll, -1) < 0)
 516             goto finish;
 517
 518     if (self->n_ref > 1)
 519
 520         /* Request the poll */
 521         if (write_command(self->main_fd, COMMAND_POLL) < 0)
 522             goto finish;
 523
 524     result = SW_OKAY;
 525
 526 finish:
 527
 528     ASSERT_SUCCESS(pthread_mutex_unlock(&self->mutex));
 529
 530     discovery_unref(self);
 531
 532     return result;
 533 }
 534
 535 sw_result sw_discovery_salt(sw_discovery self, sw_salt *salt) {
 536     assert(self);
 537     assert(salt);
 538
 539     AVAHI_WARN_LINKAGE;
 540
 541     *salt = (sw_salt) self;
 542
 543     return SW_OKAY;
 544 }
 545
 546 sw_result sw_salt_step(sw_salt self, sw_uint32 * msec) {
 547     struct pollfd p;
 548     int r;
 549     sw_result result;
 550
 551     AVAHI_WARN_LINKAGE;
 552
 553     if (!((sw_discovery) self)->thread_running)
 554         return SW_E_UNKNOWN;
 555
 556     memset(&p, 0, sizeof(p));
 557     p.fd = ((sw_discovery) self)->main_fd;
 558     p.events = POLLIN;
 559
 560     if ((r = poll(&p, 1, msec ? (int) *msec : -1)) < 0) {
 561
 562         /* Don't treat EINTR as error */
 563         if (errno == EINTR)
 564             return SW_OKAY;
 565
 566         return SW_E_UNKNOWN;
 567
 568     } else if (r == 0) {
 569
 570         /* Timeoout */
 571         return SW_OKAY;
 572
 573     } else {
 574         /* Success */
 575
 576         if (p.revents != POLLIN)
 577             return SW_E_UNKNOWN;
 578
 579         if ((result = sw_discovery_read_socket((sw_discovery) self)) != SW_OKAY)
 580             return result;
 581     }
 582
 583     return SW_OKAY;
 584 }
 585
 586 sw_result sw_salt_run(sw_salt self) {
 587     sw_result ret;
 588
 589     AVAHI_WARN_LINKAGE;
 590
 591     assert(self);
 592
 593     for (;;)
 594         if ((ret = sw_salt_step(self, NULL)) != SW_OKAY)
 595             return ret;
 596 }
 597
 598 sw_result sw_salt_stop_run(sw_salt self) {
 599     AVAHI_WARN_LINKAGE;
 600
 601     assert(self);
 602
 603     if (stop_thread((sw_discovery) self) < 0)
 604         return SW_E_UNKNOWN;
 605
 606     return SW_OKAY;
 607 }
 608
 609 sw_result sw_salt_lock(sw_salt self) {
 610     AVAHI_WARN_LINKAGE;
 611
 612     assert(self);
 613     ASSERT_SUCCESS(pthread_mutex_lock(&((sw_discovery) self)->mutex));
 614
 615     return SW_OKAY;
 616 }
 617
 618 sw_result sw_salt_unlock(sw_salt self) {
 619     assert(self);
 620
 621     AVAHI_WARN_LINKAGE;
 622
 623     ASSERT_SUCCESS(pthread_mutex_unlock(&((sw_discovery) self)->mutex));
 624
 625     return SW_OKAY;
 626 }
 627
 628 static void reg_report_status(oid_data *data, sw_discovery_publish_status status) {
 629     sw_discovery_publish_reply reply;
 630
 631     assert(data);
 632
 633     reply = (sw_discovery_publish_reply) data->reply;
 634
 635     reply(data->discovery,
 636           OID_GET_INDEX(data),
 637           status,
 638           data->extra);
 639 }
 640
 641 static int reg_create_service(oid_data *data) {
 642     int ret;
 643     const char *real_type;
 644
 645     assert(data);
 646
 647     real_type = avahi_get_type_from_subtype(data->service_data->regtype);
 648
 649     if ((ret = avahi_entry_group_add_service_strlst(
 650              data->object,
 651              data->service_data->interface,
 652              AVAHI_PROTO_INET,
 653              0,
 654              data->service_data->name,
 655              real_type ? real_type : data->service_data->regtype,
 656              data->service_data->domain,
 657              data->service_data->host,
 658              data->service_data->port,
 659              data->service_data->txt)) < 0)
 660         return ret;
 661
 662     if (real_type) {
 663         /* Create a subtype entry */
 664
 665         if (avahi_entry_group_add_service_subtype(
 666                 data->object,
 667                 data->service_data->interface,
 668                 AVAHI_PROTO_INET,
 669                 0,
 670                 data->service_data->name,
 671                 real_type,
 672                 data->service_data->domain,
 673                 data->service_data->regtype) < 0)
 674             return ret;
 675
 676     }
 677
 678     if ((ret = avahi_entry_group_commit(data->object)) < 0)
 679         return ret;
 680
 681     return 0;
 682 }
 683
 684 static void reg_client_callback(oid_data *data, AvahiClientState state) {
 685     assert(data);
 686
 687     /* We've not been setup completely */
 688     if (!data->object)
 689         return;
 690
 691     switch (state) {
 692         case AVAHI_CLIENT_DISCONNECTED:
 693             reg_report_status(data, SW_DISCOVERY_PUBLISH_INVALID);
 694             break;
 695
 696         case AVAHI_CLIENT_S_RUNNING: {
 697             int ret;
 698
 699             /* Register the service */
 700             if ((ret = reg_create_service(data)) < 0) {
 701                 reg_report_status(data, SW_DISCOVERY_PUBLISH_INVALID);
 702                 return;
 703             }
 704
 705             break;
 706         }
 707
 708         case AVAHI_CLIENT_S_COLLISION:
 709
 710             /* Remove our entry */
 711             avahi_entry_group_reset(data->object);
 712             break;
 713
 714         case AVAHI_CLIENT_S_INVALID:
 715         case AVAHI_CLIENT_S_REGISTERING:
 716             /* Ignore */
 717             break;
 718     }
 719
 720 }
 721
 722 static void reg_entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
 723     oid_data *data = userdata;
 724
 725     assert(g);
 726     assert(data);
 727
 728     switch (state) {
 729         case AVAHI_ENTRY_GROUP_ESTABLISHED:
 730
 731             reg_report_status(data, SW_DISCOVERY_PUBLISH_STARTED);
 732             break;
 733
 734         case AVAHI_ENTRY_GROUP_COLLISION:
 735
 736             reg_report_status(data, SW_DISCOVERY_PUBLISH_NAME_COLLISION);
 737             break;
 738
 739         case AVAHI_ENTRY_GROUP_REGISTERING:
 740         case AVAHI_ENTRY_GROUP_UNCOMMITED:
 741             /* Ignore */
 742             break;
 743     }
 744 }
 745
 746 sw_result sw_discovery_publish(
 747     sw_discovery self,
 748     sw_uint32 interface_index,
 749     sw_const_string name,
 750     sw_const_string type,
 751     sw_const_string domain,
 752     sw_const_string host,
 753     sw_port port,
 754     sw_octets text_record,
 755     sw_uint32 text_record_len,
 756     sw_discovery_publish_reply reply,
 757     sw_opaque extra,
 758     sw_discovery_oid * oid) {
 759
 760     oid_data *data;
 761     sw_result result = SW_E_UNKNOWN;
 762     service_data *sdata;
 763
 764     assert(self);
 765     assert(name);
 766     assert(type);
 767     assert(reply);
 768     assert(oid);
 769
 770     AVAHI_WARN_LINKAGE;
 771
 772     if ((*oid = oid_alloc(self, OID_ENTRY_GROUP)) == (sw_discovery_oid) -1)
 773         return SW_E_UNKNOWN;
 774
 775     if (!(sdata = service_data_new(self))) {
 776         oid_release(self, *oid);
 777         return SW_E_MEM;
 778     }
 779
 780     data = oid_get(self, *oid);
 781     assert(data);
 782     data->reply = (sw_result (*)(void)) reply;
 783     data->extra = extra;
 784     data->service_data = sdata;
 785
 786     sdata->interface = interface_index == 0 ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface_index;
 787     sdata->name = avahi_strdup(name);
 788     sdata->regtype = type ? avahi_normalize_name_strdup(type) : NULL;
 789     sdata->domain = domain ? avahi_normalize_name_strdup(domain) : NULL;
 790     sdata->host = host ? avahi_normalize_name_strdup(host) : NULL;
 791     sdata->port = port;
 792     sdata->txt = text_record && text_record_len > 0 ? avahi_string_list_parse(text_record, text_record_len) : NULL;
 793
 794     /* Some OOM checking would be cool here */
 795
 796     ASSERT_SUCCESS(pthread_mutex_lock(&self->mutex));
 797
 798     if (!(data->object = avahi_entry_group_new(self->client, reg_entry_group_callback, data))) {
 799         result = map_error(avahi_client_errno(self->client));
 800         goto finish;
 801     }
 802
 803     if (avahi_client_get_state(self->client) == AVAHI_CLIENT_S_RUNNING) {
 804         int error;
 805
 806         if ((error = reg_create_service(data)) < 0) {
 807             result = map_error(error);
 808             goto finish;
 809         }
 810     }
 811
 812     result = SW_OKAY;
 813
 814 finish:
 815
 816     ASSERT_SUCCESS(pthread_mutex_unlock(&self->mutex));
 817
 818     if (result != SW_OKAY)
 819         if (*oid != (sw_discovery_oid) -1)
 820             sw_discovery_cancel(self, *oid);
 821
 822     return result;
 823 }
 824
 825 static void domain_browser_callback(
 826     AvahiDomainBrowser *b,
 827     AvahiIfIndex interface,
 828     AvahiProtocol protocol,
 829     AvahiBrowserEvent event,
 830     const char *domain,
 831     AvahiLookupResultFlags flags,
 832     void *userdata) {
 833
 834     oid_data* data = userdata;
 835     sw_discovery_browse_reply reply;
 836     static char domain_fixed[AVAHI_DOMAIN_NAME_MAX];
 837
 838     assert(b);
 839     assert(data);
 840
 841     reply = (sw_discovery_browse_reply) data->reply;
 842
 843     domain  = add_trailing_dot(domain, domain_fixed, sizeof(domain_fixed));
 844
 845     switch (event) {
 846         case AVAHI_BROWSER_NEW:
 847             reply(data->discovery, OID_GET_INDEX(data), SW_DISCOVERY_BROWSE_ADD_DOMAIN, interface, NULL, NULL, domain, data->extra);
 848             break;
 849
 850         case AVAHI_BROWSER_REMOVE:
 851             reply(data->discovery, OID_GET_INDEX(data), SW_DISCOVERY_BROWSE_REMOVE_DOMAIN, interface, NULL, NULL, domain, data->extra);
 852             break;
 853
 854         case AVAHI_BROWSER_FAILURE:
 855             reply(data->discovery, OID_GET_INDEX(data), SW_DISCOVERY_BROWSE_INVALID, interface, NULL, NULL, domain, data->extra);
 856             break;
 857
 858         case AVAHI_BROWSER_CACHE_EXHAUSTED:
 859         case AVAHI_BROWSER_ALL_FOR_NOW:
 860             break;
 861     }
 862 }
 863
 864 sw_result sw_discovery_browse_domains(
 865     sw_discovery self,
 866     sw_uint32 interface_index,
 867     sw_discovery_browse_reply reply,
 868     sw_opaque extra,
 869     sw_discovery_oid * oid) {
 870
 871     oid_data *data;
 872     AvahiIfIndex ifindex;
 873     sw_result result = SW_E_UNKNOWN;
 874
 875     assert(self);
 876     assert(reply);
 877     assert(oid);
 878
 879     AVAHI_WARN_LINKAGE;
 880
 881     if ((*oid = oid_alloc(self, OID_DOMAIN_BROWSER)) == (sw_discovery_oid) -1)
 882         return SW_E_UNKNOWN;
 883
 884     data = oid_get(self, *oid);
 885     assert(data);
 886     data->reply = (sw_result (*)(void)) reply;
 887     data->extra = extra;
 888
 889     ifindex = interface_index == 0 ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface_index;
 890
 891     ASSERT_SUCCESS(pthread_mutex_lock(&self->mutex));
 892
 893     if (!(data->object = avahi_domain_browser_new(self->client, ifindex, AVAHI_PROTO_INET, NULL, AVAHI_DOMAIN_BROWSER_BROWSE, 0, domain_browser_callback, data))) {
 894         result = map_error(avahi_client_errno(self->client));
 895         goto finish;
 896     }
 897
 898     result = SW_OKAY;
 899
 900 finish:
 901
 902     ASSERT_SUCCESS(pthread_mutex_unlock(&self->mutex));
 903
 904     if (result != SW_OKAY)
 905         if (*oid != (sw_discovery_oid) -1)
 906             sw_discovery_cancel(self, *oid);
 907
 908     return result;
 909 }
 910
 911 static void service_resolver_callback(
 912     AvahiServiceResolver *r,
 913     AvahiIfIndex interface,
 914     AvahiProtocol protocol,
 915     AvahiResolverEvent event,
 916     const char *name,
 917     const char *type,
 918     const char *domain,
 919     const char *host_name,
 920     const AvahiAddress *a,
 921     uint16_t port,
 922     AvahiStringList *txt,
 923     AvahiLookupResultFlags flags,
 924     void *userdata) {
 925
 926     oid_data* data = userdata;
 927     sw_discovery_resolve_reply reply;
 928
 929     assert(r);
 930     assert(data);
 931
 932     reply = (sw_discovery_resolve_reply) data->reply;
 933
 934     switch (event) {
 935         case AVAHI_RESOLVER_FOUND: {
 936
 937             char host_name_fixed[AVAHI_DOMAIN_NAME_MAX];
 938             uint8_t *p = NULL;
 939             size_t l = 0;
 940             sw_ipv4_address addr;
 941
 942             sw_ipv4_address_init_from_saddr(&addr, a->data.ipv4.address);
 943
 944             host_name = add_trailing_dot(host_name, host_name_fixed, sizeof(host_name_fixed));
 945
 946             if ((p = avahi_new0(uint8_t, (l = avahi_string_list_serialize(txt, NULL, 0))+1)))
 947                 avahi_string_list_serialize(txt, p, l);
 948
 949             reply(data->discovery, OID_GET_INDEX(data), interface, name, type, domain, addr, port, p, l, data->extra);
 950
 951             avahi_free(p);
 952             break;
 953         }
 954
 955         case AVAHI_RESOLVER_FAILURE:
 956
 957             /* Apparently there is no way in HOWL to inform about failed resolvings ... */
 958
 959             avahi_warn("A service failed to resolve in the HOWL compatiblity layer of Avahi which is used by '%s'. "
 960                        "Since the HOWL API doesn't offer any means to inform the application about this, we have to ignore the failure. "
 961                        "Please fix your application to use the native API of Avahi!",
 962                        avahi_exe_name());
 963
 964             break;
 965     }
 966 }
 967
 968 sw_result sw_discovery_resolve(
 969     sw_discovery self,
 970     sw_uint32 interface_index,
 971     sw_const_string name,
 972     sw_const_string type,
 973     sw_const_string domain,
 974     sw_discovery_resolve_reply reply,
 975     sw_opaque extra,
 976     sw_discovery_oid * oid) {
 977
 978     oid_data *data;
 979     AvahiIfIndex ifindex;
 980     sw_result result = SW_E_UNKNOWN;
 981
 982     assert(self);
 983     assert(name);
 984     assert(type);
 985     assert(reply);
 986     assert(oid);
 987
 988     AVAHI_WARN_LINKAGE;
 989
 990     if ((*oid = oid_alloc(self, OID_SERVICE_RESOLVER)) == (sw_discovery_oid) -1)
 991         return SW_E_UNKNOWN;
 992
 993     data = oid_get(self, *oid);
 994     assert(data);
 995     data->reply = (sw_result (*)(void)) reply;
 996     data->extra = extra;
 997
 998     ifindex = interface_index == 0 ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface_index;
 999
1000     ASSERT_SUCCESS(pthread_mutex_lock(&self->mutex));
1001
1002     if (!(data->object = avahi_service_resolver_new(self->client, ifindex, AVAHI_PROTO_INET, name, type, domain, AVAHI_PROTO_INET, 0, service_resolver_callback, data))) {
1003         result = map_error(avahi_client_errno(self->client));
1004         goto finish;
1005     }
1006
1007     result = SW_OKAY;
1008
1009 finish:
1010
1011     ASSERT_SUCCESS(pthread_mutex_unlock(&self->mutex));
1012
1013     if (result != SW_OKAY)
1014         if (*oid != (sw_discovery_oid) -1)
1015             sw_discovery_cancel(self, *oid);
1016
1017     return result;
1018 }
1019
1020 static void service_browser_callback(
1021     AvahiServiceBrowser *b,
1022     AvahiIfIndex interface,
1023     AvahiProtocol protocol,
1024     AvahiBrowserEvent event,
1025     const char *name,
1026     const char *type,
1027     const char *domain,
1028     AvahiLookupResultFlags flags,
1029     void *userdata) {
1030
1031     oid_data* data = userdata;
1032     char type_fixed[AVAHI_DOMAIN_NAME_MAX], domain_fixed[AVAHI_DOMAIN_NAME_MAX];
1033     sw_discovery_browse_reply reply;
1034
1035     assert(b);
1036     assert(data);
1037
1038     reply = (sw_discovery_browse_reply) data->reply;
1039
1040     type = add_trailing_dot(type, type_fixed, sizeof(type_fixed));
1041     domain = add_trailing_dot(domain, domain_fixed, sizeof(domain_fixed));
1042
1043     switch (event) {
1044         case AVAHI_BROWSER_NEW:
1045             reply(data->discovery, OID_GET_INDEX(data), SW_DISCOVERY_BROWSE_ADD_SERVICE, interface, name, type, domain, data->extra);
1046             break;
1047
1048         case AVAHI_BROWSER_REMOVE:
1049             reply(data->discovery, OID_GET_INDEX(data), SW_DISCOVERY_BROWSE_REMOVE_SERVICE, interface, name, type, domain, data->extra);
1050             break;
1051
1052         case AVAHI_BROWSER_FAILURE:
1053             reply(data->discovery, OID_GET_INDEX(data), SW_DISCOVERY_BROWSE_INVALID, interface, name, type, domain, data->extra);
1054             break;
1055
1056         case AVAHI_BROWSER_CACHE_EXHAUSTED:
1057         case AVAHI_BROWSER_ALL_FOR_NOW:
1058             break;
1059     }
1060 }
1061
1062 sw_result sw_discovery_browse(
1063     sw_discovery self,
1064     sw_uint32 interface_index,
1065     sw_const_string type,
1066     sw_const_string domain,
1067     sw_discovery_browse_reply reply,
1068     sw_opaque extra,
1069     sw_discovery_oid * oid) {
1070
1071     oid_data *data;
1072     AvahiIfIndex ifindex;
1073     sw_result result = SW_E_UNKNOWN;
1074
1075     assert(self);
1076     assert(type);
1077     assert(reply);
1078     assert(oid);
1079
1080     AVAHI_WARN_LINKAGE;
1081
1082     if ((*oid = oid_alloc(self, OID_SERVICE_BROWSER)) == (sw_discovery_oid) -1)
1083         return SW_E_UNKNOWN;
1084
1085     data = oid_get(self, *oid);
1086     assert(data);
1087     data->reply = (sw_result (*)(void)) reply;
1088     data->extra = extra;
1089
1090     ifindex = interface_index == 0 ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface_index;
1091
1092     ASSERT_SUCCESS(pthread_mutex_lock(&self->mutex));
1093
1094     if (!(data->object = avahi_service_browser_new(self->client, ifindex, AVAHI_PROTO_INET, type, domain, 0, service_browser_callback, data))) {
1095         result = map_error(avahi_client_errno(self->client));
1096         goto finish;
1097     }
1098
1099     result = SW_OKAY;
1100
1101 finish:
1102
1103     ASSERT_SUCCESS(pthread_mutex_unlock(&self->mutex));
1104
1105     if (result != SW_OKAY)
1106         if (*oid != (sw_discovery_oid) -1)
1107             sw_discovery_cancel(self, *oid);
1108
1109     return result;
1110 }
1111
1112 sw_result sw_discovery_cancel(sw_discovery self, sw_discovery_oid oid) {
1113     oid_data *data;
1114     assert(self);
1115
1116     AVAHI_WARN_LINKAGE;
1117
1118     if (!(data = oid_get(self, oid)))
1119         return SW_E_UNKNOWN;
1120
1121     if (data->object) {
1122         switch (data->type) {
1123             case OID_SERVICE_BROWSER:
1124                 avahi_service_browser_free(data->object);
1125                 break;
1126
1127             case OID_SERVICE_RESOLVER:
1128                 avahi_service_resolver_free(data->object);
1129                 break;
1130
1131             case OID_DOMAIN_BROWSER:
1132                 avahi_domain_browser_free(data->object);
1133                 break;
1134
1135             case OID_ENTRY_GROUP:
1136                 avahi_entry_group_free(data->object);
1137                 break;
1138
1139             case OID_UNUSED:
1140             ;
1141         }
1142     }
1143
1144     if (data->service_data) {
1145         assert(data->type == OID_ENTRY_GROUP);
1146         service_data_free(self, data->service_data);
1147     }
1148
1149     oid_release(self, oid);
1150
1151     return SW_OKAY;
1152 }
1153
1154 sw_result sw_discovery_init_with_flags(
1155     sw_discovery * self,
1156     sw_discovery_init_flags flags) {
1157
1158     assert(self);
1159
1160     AVAHI_WARN_LINKAGE;
1161
1162     if (flags != SW_DISCOVERY_USE_SHARED_SERVICE)
1163         return SW_E_NO_IMPL;
1164
1165     return sw_discovery_init(self);
1166 }