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
  37 #include <avahi-client/client.h>
  38 #include <avahi-client/publish.h>
  39 #include <avahi-client/lookup.h>
  40
  41 #include "howl.h"
  42 #include "warn.h"
  43
  44 #define OID_MAX 50
  45
  46 enum {
  47     COMMAND_POLL = 'p',
  48     COMMAND_QUIT = 'q',
  49     COMMAND_POLL_DONE = 'P',
  50     COMMAND_POLL_FAILED = 'F'
  51 };
  52
  53 typedef enum {
  54     OID_UNUSED = 0,
  55     OID_SERVICE_BROWSER,
  56     OID_SERVICE_RESOLVER,
  57     OID_DOMAIN_BROWSER,
  58     OID_ENTRY_GROUP
  59 } oid_type;
  60
  61 typedef struct service_data service_data;
  62
  63 typedef struct oid_data {
  64     oid_type type;
  65     sw_opaque extra;
  66     sw_discovery discovery;
  67     void *object;
  68     sw_result (*reply)(void);
  69     service_data *service_data;
  70 } oid_data;
  71
  72
  73 struct service_data {
  74     char *name, *regtype, *domain, *host;
  75     uint16_t port;
  76     AvahiIfIndex interface;
  77     AvahiStringList *txt;
  78     AVAHI_LLIST_FIELDS(service_data, services);
  79 };
  80
  81 struct _sw_discovery {
  82     int n_ref;
  83     AvahiSimplePoll *simple_poll;
  84     AvahiClient *client;
  85
  86     oid_data oid_table[OID_MAX];
  87     sw_discovery_oid oid_index;
  88
  89     int thread_fd, main_fd;
  90
  91     pthread_t thread;
  92     int thread_running;
  93
  94     pthread_mutex_t mutex, salt_mutex;
  95
  96     AVAHI_LLIST_HEAD(service_data, services);
  97 };
  98
  99 #define ASSERT_SUCCESS(r) { int __ret = (r); assert(__ret == 0); }
 100
 101 #define OID_GET_INDEX(data) ((sw_discovery_oid) (((data) - ((data)->discovery->oid_table))))
 102
 103 static sw_discovery discovery_ref(sw_discovery self);
 104 static void discovery_unref(sw_discovery self);
 105
 106 static const char *add_trailing_dot(const char *s, char *buf, size_t buf_len) {
 107     if (!s)
 108         return NULL;
 109
 110     if (*s == 0)
 111         return s;
 112
 113     if (s[strlen(s)-1] == '.')
 114         return s;
 115
 116     snprintf(buf, buf_len, "%s.", s);
 117     return buf;
 118 }
 119
 120 static sw_result map_error(int error) {
 121     switch (error) {
 122         case AVAHI_OK:
 123             return SW_OKAY;
 124
 125         case AVAHI_ERR_NO_MEMORY:
 126             return SW_E_MEM;
 127     }
 128
 129     return SW_E_UNKNOWN;
 130 }
 131
 132 static int read_command(int fd) {
 133     ssize_t r;
 134     char command;
 135
 136     assert(fd >= 0);
 137
 138     if ((r = read(fd, &command, 1)) != 1) {
 139         fprintf(stderr, __FILE__": read() failed: %s\n", r < 0 ? strerror(errno) : "EOF");
 140         return -1;
 141     }
 142
 143     return command;
 144 }
 145
 146 static int write_command(int fd, char reply) {
 147     assert(fd >= 0);
 148
 149     if (write(fd, &reply, 1) != 1) {
 150         fprintf(stderr, __FILE__": write() failed: %s\n", strerror(errno));
 151         return -1;
 152     }
 153
 154     return 0;
 155 }
 156
 157 static int poll_func(struct pollfd *ufds, unsigned int nfds, int timeout, void *userdata) {
 158     sw_discovery self = userdata;
 159     int ret;
 160
 161     assert(self);
 162
 163     ASSERT_SUCCESS(pthread_mutex_unlock(&self->mutex));
 164     ret = poll(ufds, nfds, timeout);
 165     ASSERT_SUCCESS(pthread_mutex_lock(&self->mutex));
 166
 167     return ret;
 168 }
 169
 170 static void * thread_func(void *data) {
 171     sw_discovery self = data;
 172     sigset_t mask;
 173
 174     sigfillset(&mask);
 175     pthread_sigmask(SIG_BLOCK, &mask, NULL);
 176
 177     self->thread = pthread_self();
 178     self->thread_running = 1;
 179
 180     for (;;) {
 181         char command;
 182
 183         if ((command = read_command(self->thread_fd)) < 0)
 184             break;
 185
 186 /*         fprintf(stderr, "Command: %c\n", command); */
 187
 188         switch (command) {
 189
 190             case COMMAND_POLL: {
 191                 int ret;
 192
 193                 ASSERT_SUCCESS(pthread_mutex_lock(&self->mutex));
 194
 195                 for (;;) {
 196                     errno = 0;
 197
 198                     if ((ret = avahi_simple_poll_run(self->simple_poll)) < 0) {
 199
 200                         if (errno == EINTR)
 201                             continue;
 202
 203                         fprintf(stderr, __FILE__": avahi_simple_poll_run() failed: %s\n", strerror(errno));
 204                     }
 205
 206                     break;
 207                 }
 208
 209                 ASSERT_SUCCESS(pthread_mutex_unlock(&self->mutex));
 210
 211                 if (write_command(self->thread_fd, ret < 0 ? COMMAND_POLL_FAILED : COMMAND_POLL_DONE) < 0)
 212                     break;
 213
 214                 break;
 215             }
 216
 217             case COMMAND_QUIT:
 218                 return NULL;
 219         }
 220
 221     }
 222
 223     return NULL;
 224 }
 225
 226 static int oid_alloc(sw_discovery self, oid_type type) {
 227     sw_discovery_oid i;
 228     assert(self);
 229
 230     for (i = 0; i < OID_MAX; i++) {
 231
 232         while (self->oid_index >= OID_MAX)
 233             self->oid_index -= OID_MAX;
 234
 235         if (self->oid_table[self->oid_index].type == OID_UNUSED) {
 236             self->oid_table[self->oid_index].type = type;
 237             self->oid_table[self->oid_index].discovery = self;
 238
 239             assert(OID_GET_INDEX(&self->oid_table[self->oid_index]) == self->oid_index);
 240
 241             return self->oid_index ++;
 242         }
 243
 244         self->oid_index ++;
 245     }
 246
 247     /* No free entry found */
 248
 249     return (sw_discovery_oid) -1;
 250 }
 251
 252 static void oid_release(sw_discovery self, sw_discovery_oid oid) {
 253     assert(self);
 254     assert(oid < OID_MAX);
 255
 256     assert(self->oid_table[oid].type != OID_UNUSED);
 257
 258     self->oid_table[oid].type = OID_UNUSED;
 259     self->oid_table[oid].discovery = NULL;
 260     self->oid_table[oid].reply = NULL;
 261     self->oid_table[oid].object = NULL;
 262     self->oid_table[oid].extra = NULL;
 263     self->oid_table[oid].service_data = NULL;
 264 }
 265
 266 static oid_data* oid_get(sw_discovery self, sw_discovery_oid oid) {
 267     assert(self);
 268
 269     if (oid >= OID_MAX)
 270         return NULL;
 271
 272     if (self->oid_table[oid].type == OID_UNUSED)
 273         return NULL;
 274
 275     return &self->oid_table[oid];
 276 }
 277
 278 static service_data* service_data_new(sw_discovery self) {
 279     service_data *sdata;
 280
 281     assert(self);
 282
 283     if (!(sdata = avahi_new0(service_data, 1)))
 284         return NULL;
 285
 286     AVAHI_LLIST_PREPEND(service_data, services, self->services, sdata);
 287
 288     return sdata;
 289
 290 }
 291
 292 static void service_data_free(sw_discovery self, service_data* sdata) {
 293     assert(self);
 294     assert(sdata);
 295
 296     AVAHI_LLIST_REMOVE(service_data, services, self->services, sdata);
 297
 298     avahi_free(sdata->name);
 299     avahi_free(sdata->regtype);
 300     avahi_free(sdata->domain);
 301     avahi_free(sdata->host);
 302     avahi_string_list_free(sdata->txt);
 303     avahi_free(sdata);
 304 }
 305
 306 static void reg_client_callback(oid_data *data, AvahiClientState state);
 307
 308 static void client_callback(AvahiClient *s, AvahiClientState state, void* userdata) {
 309     sw_discovery self = userdata;
 310     sw_discovery_oid oid;
 311
 312     assert(s);
 313     assert(self);
 314
 315     discovery_ref(self);
 316
 317     for (oid = 0; oid < OID_MAX; oid++) {
 318
 319         switch (self->oid_table[oid].type) {
 320
 321             case OID_ENTRY_GROUP:
 322                 reg_client_callback(&self->oid_table[oid], state);
 323                 break;
 324
 325             case OID_DOMAIN_BROWSER:
 326             case OID_SERVICE_BROWSER:
 327                 ((sw_discovery_browse_reply) self->oid_table[oid].reply)(self, oid, SW_DISCOVERY_BROWSE_INVALID, 0, NULL, NULL, NULL, self->oid_table[oid].extra);
 328                 break;
 329
 330             case OID_SERVICE_RESOLVER:
 331             case OID_UNUSED:
 332                 ;
 333         }
 334     }
 335
 336     discovery_unref(self);
 337 }
 338
 339 sw_result sw_discovery_init(sw_discovery * self) {
 340     int fd[2] = { -1, -1};
 341     sw_result result = SW_E_UNKNOWN;
 342     pthread_mutexattr_t mutex_attr;
 343     int error;
 344
 345     assert(self);
 346
 347     AVAHI_WARN_LINKAGE;
 348
 349     *self = NULL;
 350
 351     if (socketpair(AF_UNIX, SOCK_STREAM, 0, fd) < 0)
 352         goto fail;
 353
 354     if (!(*self = avahi_new(struct _sw_discovery, 1))) {
 355         result = SW_E_MEM;
 356         goto fail;
 357     }
 358
 359     (*self)->n_ref = 1;
 360     (*self)->thread_fd = fd[0];
 361     (*self)->main_fd = fd[1];
 362
 363     (*self)->client = NULL;
 364     (*self)->simple_poll = NULL;
 365
 366     memset((*self)->oid_table, 0, sizeof((*self)->oid_table));
 367     (*self)->oid_index = 0;
 368
 369     (*self)->thread_running = 0;
 370
 371     AVAHI_LLIST_HEAD_INIT(service_info, (*self)->services);
 372
 373     ASSERT_SUCCESS(pthread_mutexattr_init(&mutex_attr));
 374     pthread_mutexattr_settype(&mutex_attr, PTHREAD_MUTEX_RECURSIVE);
 375     ASSERT_SUCCESS(pthread_mutex_init(&(*self)->mutex, &mutex_attr));
 376     ASSERT_SUCCESS(pthread_mutex_init(&(*self)->salt_mutex, &mutex_attr));
 377
 378     if (!((*self)->simple_poll = avahi_simple_poll_new()))
 379         goto fail;
 380
 381     avahi_simple_poll_set_func((*self)->simple_poll, poll_func, *self);
 382
 383     if (!((*self)->client = avahi_client_new(avahi_simple_poll_get((*self)->simple_poll), client_callback, *self, &error))) {
 384         result = map_error(error);
 385         goto fail;
 386     }
 387
 388     /* Start simple poll */
 389     if (avahi_simple_poll_prepare((*self)->simple_poll, -1) < 0)
 390         goto fail;
 391
 392     /* Queue an initial POLL command for the thread */
 393     if (write_command((*self)->main_fd, COMMAND_POLL) < 0)
 394         goto fail;
 395
 396     if (pthread_create(&(*self)->thread, NULL, thread_func, *self) != 0)
 397         goto fail;
 398
 399     (*self)->thread_running = 1;
 400
 401     return SW_OKAY;
 402
 403 fail:
 404
 405     if (*self)
 406         sw_discovery_fina(*self);
 407
 408     return result;
 409 }
 410
 411 static int stop_thread(sw_discovery self) {
 412     assert(self);
 413
 414     if (!self->thread_running)
 415         return 0;
 416
 417     if (write_command(self->main_fd, COMMAND_QUIT) < 0)
 418         return -1;
 419
 420     avahi_simple_poll_wakeup(self->simple_poll);
 421
 422     ASSERT_SUCCESS(pthread_join(self->thread, NULL));
 423     self->thread_running = 0;
 424     return 0;
 425 }
 426
 427 static sw_discovery discovery_ref(sw_discovery self) {
 428     assert(self);
 429     assert(self->n_ref >= 1);
 430
 431     self->n_ref++;
 432
 433     return self;
 434 }
 435
 436 static void discovery_unref(sw_discovery self) {
 437     assert(self);
 438     assert(self->n_ref >= 1);
 439
 440     if (--self->n_ref > 0)
 441         return;
 442
 443     stop_thread(self);
 444
 445     if (self->client)
 446         avahi_client_free(self->client);
 447
 448     if (self->simple_poll)
 449         avahi_simple_poll_free(self->simple_poll);
 450
 451     if (self->thread_fd >= 0)
 452         close(self->thread_fd);
 453
 454     if (self->main_fd >= 0)
 455         close(self->main_fd);
 456
 457     ASSERT_SUCCESS(pthread_mutex_destroy(&self->mutex));
 458     ASSERT_SUCCESS(pthread_mutex_destroy(&self->salt_mutex));
 459
 460     while (self->services)
 461         service_data_free(self, self->services);
 462
 463     avahi_free(self);
 464 }
 465
 466 sw_result sw_discovery_fina(sw_discovery self) {
 467     assert(self);
 468
 469     AVAHI_WARN_LINKAGE;
 470
 471     stop_thread(self);
 472     discovery_unref(self);
 473
 474     return SW_OKAY;
 475 }
 476
 477 sw_result sw_discovery_run(sw_discovery self) {
 478     assert(self);
 479
 480     AVAHI_WARN_LINKAGE;
 481
 482     return sw_salt_run((sw_salt) self);
 483 }
 484
 485 sw_result sw_discovery_stop_run(sw_discovery self) {
 486     assert(self);
 487
 488     AVAHI_WARN_LINKAGE;
 489
 490     return sw_salt_stop_run((sw_salt) self);
 491 }
 492
 493 int sw_discovery_socket(sw_discovery self) {
 494     assert(self);
 495
 496     AVAHI_WARN_LINKAGE;
 497
 498     return self->main_fd;
 499 }
 500
 501 sw_result sw_discovery_read_socket(sw_discovery self) {
 502     sw_result result = SW_E_UNKNOWN;
 503
 504     assert(self);
 505
 506     discovery_ref(self);
 507
 508     ASSERT_SUCCESS(pthread_mutex_lock(&self->mutex));
 509
 510     /* Cleanup notification socket */
 511     if (read_command(self->main_fd) != COMMAND_POLL_DONE)
 512         goto finish;
 513
 514     if (avahi_simple_poll_dispatch(self->simple_poll) < 0)
 515         goto finish;
 516
 517     if (self->n_ref > 1) /* Perhaps we should die */
 518
 519         /* Dispatch events */
 520         if (avahi_simple_poll_prepare(self->simple_poll, -1) < 0)
 521             goto finish;
 522
 523     if (self->n_ref > 1)
 524
 525         /* Request the poll */
 526         if (write_command(self->main_fd, COMMAND_POLL) < 0)
 527             goto finish;
 528
 529     result = SW_OKAY;
 530
 531 finish:
 532
 533     ASSERT_SUCCESS(pthread_mutex_unlock(&self->mutex));
 534
 535     discovery_unref(self);
 536
 537     return result;
 538 }
 539
 540 sw_result sw_discovery_salt(sw_discovery self, sw_salt *salt) {
 541     assert(self);
 542     assert(salt);
 543
 544     AVAHI_WARN_LINKAGE;
 545
 546     *salt = (sw_salt) self;
 547
 548     return SW_OKAY;
 549 }
 550
 551 sw_result sw_salt_step(sw_salt self, sw_uint32 * msec) {
 552     struct pollfd p;
 553     int r;
 554     sw_result result;
 555
 556     AVAHI_WARN_LINKAGE;
 557
 558     if (!((sw_discovery) self)->thread_running)
 559         return SW_E_UNKNOWN;
 560
 561     memset(&p, 0, sizeof(p));
 562     p.fd = ((sw_discovery) self)->main_fd;
 563     p.events = POLLIN;
 564
 565     if ((r = poll(&p, 1, msec ? (int) *msec : -1)) < 0) {
 566
 567         /* Don't treat EINTR as error */
 568         if (errno == EINTR)
 569             return SW_OKAY;
 570
 571         return SW_E_UNKNOWN;
 572
 573     } else if (r == 0) {
 574
 575         /* Timeoout */
 576         return SW_OKAY;
 577
 578     } else {
 579         /* Success */
 580
 581         if (p.revents != POLLIN)
 582             return SW_E_UNKNOWN;
 583
 584         if ((result = sw_discovery_read_socket((sw_discovery) self)) != SW_OKAY)
 585             return result;
 586     }
 587
 588     return SW_OKAY;
 589 }
 590
 591 sw_result sw_salt_run(sw_salt self) {
 592     sw_result ret;
 593
 594     AVAHI_WARN_LINKAGE;
 595
 596     assert(self);
 597
 598     for (;;)
 599         if ((ret = sw_salt_step(self, NULL)) != SW_OKAY)
 600             return ret;
 601 }
 602
 603 sw_result sw_salt_stop_run(sw_salt self) {
 604     AVAHI_WARN_LINKAGE;
 605
 606     assert(self);
 607
 608     if (stop_thread((sw_discovery) self) < 0)
 609         return SW_E_UNKNOWN;
 610
 611     return SW_OKAY;
 612 }
 613
 614 sw_result sw_salt_lock(sw_salt self) {
 615     AVAHI_WARN_LINKAGE;
 616
 617     assert(self);
 618     ASSERT_SUCCESS(pthread_mutex_lock(&((sw_discovery) self)->salt_mutex));
 619
 620     return SW_OKAY;
 621 }
 622
 623 sw_result sw_salt_unlock(sw_salt self) {
 624     assert(self);
 625
 626     AVAHI_WARN_LINKAGE;
 627
 628     ASSERT_SUCCESS(pthread_mutex_unlock(&((sw_discovery) self)->salt_mutex));
 629
 630     return SW_OKAY;
 631 }
 632
 633 static void reg_report_status(oid_data *data, sw_discovery_publish_status status) {
 634     sw_discovery_publish_reply reply;
 635
 636     assert(data);
 637
 638     reply = (sw_discovery_publish_reply) data->reply;
 639
 640     reply(data->discovery,
 641           OID_GET_INDEX(data),
 642           status,
 643           data->extra);
 644 }
 645
 646 static int reg_create_service(oid_data *data) {
 647     int ret;
 648     const char *real_type;
 649
 650     assert(data);
 651
 652     real_type = avahi_get_type_from_subtype(data->service_data->regtype);
 653
 654     if ((ret = avahi_entry_group_add_service_strlst(
 655              data->object,
 656              data->service_data->interface,
 657              AVAHI_PROTO_INET,
 658              0,
 659              data->service_data->name,
 660              real_type ? real_type : data->service_data->regtype,
 661              data->service_data->domain,
 662              data->service_data->host,
 663              data->service_data->port,
 664              data->service_data->txt)) < 0)
 665         return ret;
 666
 667     if (real_type) {
 668         /* Create a subtype entry */
 669
 670         if (avahi_entry_group_add_service_subtype(
 671                 data->object,
 672                 data->service_data->interface,
 673                 AVAHI_PROTO_INET,
 674                 0,
 675                 data->service_data->name,
 676                 real_type,
 677                 data->service_data->domain,
 678                 data->service_data->regtype) < 0)
 679             return ret;
 680
 681     }
 682
 683     if ((ret = avahi_entry_group_commit(data->object)) < 0)
 684         return ret;
 685
 686     return 0;
 687 }
 688
 689 static void reg_client_callback(oid_data *data, AvahiClientState state) {
 690     assert(data);
 691
 692     /* We've not been setup completely */
 693     if (!data->object)
 694         return;
 695
 696     switch (state) {
 697         case AVAHI_CLIENT_DISCONNECTED:
 698             reg_report_status(data, SW_DISCOVERY_PUBLISH_INVALID);
 699             break;
 700
 701         case AVAHI_CLIENT_S_RUNNING: {
 702             int ret;
 703
 704             /* Register the service */
 705             if ((ret = reg_create_service(data)) < 0) {
 706                 reg_report_status(data, SW_DISCOVERY_PUBLISH_INVALID);
 707                 return;
 708             }
 709
 710             break;
 711         }
 712
 713         case AVAHI_CLIENT_S_COLLISION:
 714
 715             /* Remove our entry */
 716             avahi_entry_group_reset(data->object);
 717             break;
 718
 719         case AVAHI_CLIENT_S_INVALID:
 720         case AVAHI_CLIENT_S_REGISTERING:
 721             /* Ignore */
 722             break;
 723     }
 724
 725 }
 726
 727 static void reg_entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
 728     oid_data *data = userdata;
 729
 730     assert(g);
 731     assert(data);
 732
 733     switch (state) {
 734         case AVAHI_ENTRY_GROUP_ESTABLISHED:
 735
 736             reg_report_status(data, SW_DISCOVERY_PUBLISH_STARTED);
 737             break;
 738
 739         case AVAHI_ENTRY_GROUP_COLLISION:
 740
 741             reg_report_status(data, SW_DISCOVERY_PUBLISH_NAME_COLLISION);
 742             break;
 743
 744         case AVAHI_ENTRY_GROUP_REGISTERING:
 745         case AVAHI_ENTRY_GROUP_UNCOMMITED:
 746             /* Ignore */
 747             break;
 748     }
 749 }
 750
 751 sw_result sw_discovery_publish(
 752     sw_discovery self,
 753     sw_uint32 interface_index,
 754     sw_const_string name,
 755     sw_const_string type,
 756     sw_const_string domain,
 757     sw_const_string host,
 758     sw_port port,
 759     sw_octets text_record,
 760     sw_uint32 text_record_len,
 761     sw_discovery_publish_reply reply,
 762     sw_opaque extra,
 763     sw_discovery_oid * oid) {
 764
 765     oid_data *data;
 766     sw_result result = SW_E_UNKNOWN;
 767     service_data *sdata;
 768
 769     assert(self);
 770     assert(name);
 771     assert(type);
 772     assert(reply);
 773     assert(oid);
 774
 775     AVAHI_WARN_LINKAGE;
 776
 777     if ((*oid = oid_alloc(self, OID_ENTRY_GROUP)) == (sw_discovery_oid) -1)
 778         return SW_E_UNKNOWN;
 779
 780     if (!(sdata = service_data_new(self))) {
 781         oid_release(self, *oid);
 782         return SW_E_MEM;
 783     }
 784
 785     data = oid_get(self, *oid);
 786     assert(data);
 787     data->reply = (sw_result (*)(void)) reply;
 788     data->extra = extra;
 789     data->service_data = sdata;
 790
 791     sdata->interface = interface_index == 0 ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface_index;
 792     sdata->name = avahi_strdup(name);
 793     sdata->regtype = type ? avahi_normalize_name_strdup(type) : NULL;
 794     sdata->domain = domain ? avahi_normalize_name_strdup(domain) : NULL;
 795     sdata->host = host ? avahi_normalize_name_strdup(host) : NULL;
 796     sdata->port = port;
 797     sdata->txt = text_record && text_record_len > 0 ? avahi_string_list_parse(text_record, text_record_len) : NULL;
 798
 799     /* Some OOM checking would be cool here */
 800
 801     ASSERT_SUCCESS(pthread_mutex_lock(&self->mutex));
 802
 803     if (!(data->object = avahi_entry_group_new(self->client, reg_entry_group_callback, data))) {
 804         result = map_error(avahi_client_errno(self->client));
 805         goto finish;
 806     }
 807
 808     if (avahi_client_get_state(self->client) == AVAHI_CLIENT_S_RUNNING) {
 809         int error;
 810
 811         if ((error = reg_create_service(data)) < 0) {
 812             result = map_error(error);
 813             goto finish;
 814         }
 815     }
 816
 817     result = SW_OKAY;
 818
 819 finish:
 820
 821     ASSERT_SUCCESS(pthread_mutex_unlock(&self->mutex));
 822
 823     if (result != SW_OKAY)
 824         if (*oid != (sw_discovery_oid) -1)
 825             sw_discovery_cancel(self, *oid);
 826
 827     return result;
 828 }
 829
 830 static void domain_browser_callback(
 831     AvahiDomainBrowser *b,
 832     AvahiIfIndex interface,
 833     AvahiProtocol protocol,
 834     AvahiBrowserEvent event,
 835     const char *domain,
 836     AvahiLookupResultFlags flags,
 837     void *userdata) {
 838
 839     oid_data* data = userdata;
 840     sw_discovery_browse_reply reply;
 841     static char domain_fixed[AVAHI_DOMAIN_NAME_MAX];
 842
 843     assert(b);
 844     assert(data);
 845
 846     reply = (sw_discovery_browse_reply) data->reply;
 847
 848     domain  = add_trailing_dot(domain, domain_fixed, sizeof(domain_fixed));
 849
 850     switch (event) {
 851         case AVAHI_BROWSER_NEW:
 852             reply(data->discovery, OID_GET_INDEX(data), SW_DISCOVERY_BROWSE_ADD_DOMAIN, interface, NULL, NULL, domain, data->extra);
 853             break;
 854
 855         case AVAHI_BROWSER_REMOVE:
 856             reply(data->discovery, OID_GET_INDEX(data), SW_DISCOVERY_BROWSE_REMOVE_DOMAIN, interface, NULL, NULL, domain, data->extra);
 857             break;
 858
 859         case AVAHI_BROWSER_FAILURE:
 860             reply(data->discovery, OID_GET_INDEX(data), SW_DISCOVERY_BROWSE_INVALID, interface, NULL, NULL, domain, data->extra);
 861             break;
 862
 863         case AVAHI_BROWSER_CACHE_EXHAUSTED:
 864         case AVAHI_BROWSER_ALL_FOR_NOW:
 865             break;
 866     }
 867 }
 868
 869 sw_result sw_discovery_browse_domains(
 870     sw_discovery self,
 871     sw_uint32 interface_index,
 872     sw_discovery_browse_reply reply,
 873     sw_opaque extra,
 874     sw_discovery_oid * oid) {
 875
 876     oid_data *data;
 877     AvahiIfIndex ifindex;
 878     sw_result result = SW_E_UNKNOWN;
 879
 880     assert(self);
 881     assert(reply);
 882     assert(oid);
 883
 884     AVAHI_WARN_LINKAGE;
 885
 886     if ((*oid = oid_alloc(self, OID_DOMAIN_BROWSER)) == (sw_discovery_oid) -1)
 887         return SW_E_UNKNOWN;
 888
 889     data = oid_get(self, *oid);
 890     assert(data);
 891     data->reply = (sw_result (*)(void)) reply;
 892     data->extra = extra;
 893
 894     ifindex = interface_index == 0 ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface_index;
 895
 896     ASSERT_SUCCESS(pthread_mutex_lock(&self->mutex));
 897
 898     if (!(data->object = avahi_domain_browser_new(self->client, ifindex, AVAHI_PROTO_INET, NULL, AVAHI_DOMAIN_BROWSER_BROWSE, 0, domain_browser_callback, data))) {
 899         result = map_error(avahi_client_errno(self->client));
 900         goto finish;
 901     }
 902
 903     result = SW_OKAY;
 904
 905 finish:
 906
 907     ASSERT_SUCCESS(pthread_mutex_unlock(&self->mutex));
 908
 909     if (result != SW_OKAY)
 910         if (*oid != (sw_discovery_oid) -1)
 911             sw_discovery_cancel(self, *oid);
 912
 913     return result;
 914 }
 915
 916 static void service_resolver_callback(
 917     AvahiServiceResolver *r,
 918     AvahiIfIndex interface,
 919     AvahiProtocol protocol,
 920     AvahiResolverEvent event,
 921     const char *name,
 922     const char *type,
 923     const char *domain,
 924     const char *host_name,
 925     const AvahiAddress *a,
 926     uint16_t port,
 927     AvahiStringList *txt,
 928     AvahiLookupResultFlags flags,
 929     void *userdata) {
 930
 931     oid_data* data = userdata;
 932     sw_discovery_resolve_reply reply;
 933
 934     assert(r);
 935     assert(data);
 936
 937     reply = (sw_discovery_resolve_reply) data->reply;
 938
 939     switch (event) {
 940         case AVAHI_RESOLVER_FOUND: {
 941
 942             char host_name_fixed[AVAHI_DOMAIN_NAME_MAX];
 943             uint8_t *p = NULL;
 944             size_t l = 0;
 945             sw_ipv4_address addr;
 946
 947             sw_ipv4_address_init_from_saddr(&addr, a->data.ipv4.address);
 948
 949             host_name = add_trailing_dot(host_name, host_name_fixed, sizeof(host_name_fixed));
 950
 951             if ((p = avahi_new0(uint8_t, (l = avahi_string_list_serialize(txt, NULL, 0))+1)))
 952                 avahi_string_list_serialize(txt, p, l);
 953
 954             reply(data->discovery, OID_GET_INDEX(data), interface, name, type, domain, addr, port, p, l, data->extra);
 955
 956             avahi_free(p);
 957             break;
 958         }
 959
 960         case AVAHI_RESOLVER_FAILURE:
 961
 962             /* Apparently there is no way in HOWL to inform about failed resolvings ... */
 963
 964             avahi_warn("A service failed to resolve in the HOWL compatiblity layer of Avahi which is used by '%s'. "
 965                        "Since the HOWL API doesn't offer any means to inform the application about this, we have to ignore the failure. "
 966                        "Please fix your application to use the native API of Avahi!",
 967                        avahi_exe_name());
 968
 969             break;
 970     }
 971 }
 972
 973 sw_result sw_discovery_resolve(
 974     sw_discovery self,
 975     sw_uint32 interface_index,
 976     sw_const_string name,
 977     sw_const_string type,
 978     sw_const_string domain,
 979     sw_discovery_resolve_reply reply,
 980     sw_opaque extra,
 981     sw_discovery_oid * oid) {
 982
 983     oid_data *data;
 984     AvahiIfIndex ifindex;
 985     sw_result result = SW_E_UNKNOWN;
 986
 987     assert(self);
 988     assert(name);
 989     assert(type);
 990     assert(reply);
 991     assert(oid);
 992
 993     AVAHI_WARN_LINKAGE;
 994
 995     if ((*oid = oid_alloc(self, OID_SERVICE_RESOLVER)) == (sw_discovery_oid) -1)
 996         return SW_E_UNKNOWN;
 997
 998     data = oid_get(self, *oid);
 999     assert(data);
1000     data->reply = (sw_result (*)(void)) reply;
1001     data->extra = extra;
1002
1003     ifindex = interface_index == 0 ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface_index;
1004
1005     ASSERT_SUCCESS(pthread_mutex_lock(&self->mutex));
1006
1007     if (!(data->object = avahi_service_resolver_new(self->client, ifindex, AVAHI_PROTO_INET, name, type, domain, AVAHI_PROTO_INET, 0, service_resolver_callback, data))) {
1008         result = map_error(avahi_client_errno(self->client));
1009         goto finish;
1010     }
1011
1012     result = SW_OKAY;
1013
1014 finish:
1015
1016     ASSERT_SUCCESS(pthread_mutex_unlock(&self->mutex));
1017
1018     if (result != SW_OKAY)
1019         if (*oid != (sw_discovery_oid) -1)
1020             sw_discovery_cancel(self, *oid);
1021
1022     return result;
1023 }
1024
1025 static void service_browser_callback(
1026     AvahiServiceBrowser *b,
1027     AvahiIfIndex interface,
1028     AvahiProtocol protocol,
1029     AvahiBrowserEvent event,
1030     const char *name,
1031     const char *type,
1032     const char *domain,
1033     AvahiLookupResultFlags flags,
1034     void *userdata) {
1035
1036     oid_data* data = userdata;
1037     char type_fixed[AVAHI_DOMAIN_NAME_MAX], domain_fixed[AVAHI_DOMAIN_NAME_MAX];
1038     sw_discovery_browse_reply reply;
1039
1040     assert(b);
1041     assert(data);
1042
1043     reply = (sw_discovery_browse_reply) data->reply;
1044
1045     type = add_trailing_dot(type, type_fixed, sizeof(type_fixed));
1046     domain = add_trailing_dot(domain, domain_fixed, sizeof(domain_fixed));
1047
1048     switch (event) {
1049         case AVAHI_BROWSER_NEW:
1050             reply(data->discovery, OID_GET_INDEX(data), SW_DISCOVERY_BROWSE_ADD_SERVICE, interface, name, type, domain, data->extra);
1051             break;
1052
1053         case AVAHI_BROWSER_REMOVE:
1054             reply(data->discovery, OID_GET_INDEX(data), SW_DISCOVERY_BROWSE_REMOVE_SERVICE, interface, name, type, domain, data->extra);
1055             break;
1056
1057         case AVAHI_BROWSER_FAILURE:
1058             reply(data->discovery, OID_GET_INDEX(data), SW_DISCOVERY_BROWSE_INVALID, interface, name, type, domain, data->extra);
1059             break;
1060
1061         case AVAHI_BROWSER_CACHE_EXHAUSTED:
1062         case AVAHI_BROWSER_ALL_FOR_NOW:
1063             break;
1064     }
1065 }
1066
1067 sw_result sw_discovery_browse(
1068     sw_discovery self,
1069     sw_uint32 interface_index,
1070     sw_const_string type,
1071     sw_const_string domain,
1072     sw_discovery_browse_reply reply,
1073     sw_opaque extra,
1074     sw_discovery_oid * oid) {
1075
1076     oid_data *data;
1077     AvahiIfIndex ifindex;
1078     sw_result result = SW_E_UNKNOWN;
1079
1080     assert(self);
1081     assert(type);
1082     assert(reply);
1083     assert(oid);
1084
1085     AVAHI_WARN_LINKAGE;
1086
1087     if ((*oid = oid_alloc(self, OID_SERVICE_BROWSER)) == (sw_discovery_oid) -1)
1088         return SW_E_UNKNOWN;
1089
1090     data = oid_get(self, *oid);
1091     assert(data);
1092     data->reply = (sw_result (*)(void)) reply;
1093     data->extra = extra;
1094
1095     ifindex = interface_index == 0 ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface_index;
1096
1097     ASSERT_SUCCESS(pthread_mutex_lock(&self->mutex));
1098
1099     if (!(data->object = avahi_service_browser_new(self->client, ifindex, AVAHI_PROTO_INET, type, domain, 0, service_browser_callback, data))) {
1100         result = map_error(avahi_client_errno(self->client));
1101         goto finish;
1102     }
1103
1104     result = SW_OKAY;
1105
1106 finish:
1107
1108     ASSERT_SUCCESS(pthread_mutex_unlock(&self->mutex));
1109
1110     if (result != SW_OKAY)
1111         if (*oid != (sw_discovery_oid) -1)
1112             sw_discovery_cancel(self, *oid);
1113
1114     return result;
1115 }
1116
1117 sw_result sw_discovery_cancel(sw_discovery self, sw_discovery_oid oid) {
1118     oid_data *data;
1119     assert(self);
1120
1121     AVAHI_WARN_LINKAGE;
1122
1123     if (!(data = oid_get(self, oid)))
1124         return SW_E_UNKNOWN;
1125
1126     if (data->object) {
1127         switch (data->type) {
1128             case OID_SERVICE_BROWSER:
1129                 avahi_service_browser_free(data->object);
1130                 break;
1131
1132             case OID_SERVICE_RESOLVER:
1133                 avahi_service_resolver_free(data->object);
1134                 break;
1135
1136             case OID_DOMAIN_BROWSER:
1137                 avahi_domain_browser_free(data->object);
1138                 break;
1139
1140             case OID_ENTRY_GROUP:
1141                 avahi_entry_group_free(data->object);
1142                 break;
1143
1144             case OID_UNUSED:
1145             ;
1146         }
1147     }
1148
1149     if (data->service_data) {
1150         assert(data->type == OID_ENTRY_GROUP);
1151         service_data_free(self, data->service_data);
1152     }
1153
1154     oid_release(self, oid);
1155
1156     return SW_OKAY;
1157 }
1158
1159 sw_result sw_discovery_init_with_flags(
1160     sw_discovery * self,
1161     sw_discovery_init_flags flags) {
1162
1163     assert(self);
1164
1165     AVAHI_WARN_LINKAGE;
1166
1167     if (flags != SW_DISCOVERY_USE_SHARED_SERVICE)
1168         return SW_E_NO_IMPL;
1169
1170     return sw_discovery_init(self);
1171 }