src/modules/module-zeroconf-publish.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it 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   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public
  17   License along with PulseAudio; 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 <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30
  31 #include <avahi-client/client.h>
  32 #include <avahi-client/publish.h>
  33 #include <avahi-common/alternative.h>
  34 #include <avahi-common/error.h>
  35 #include <avahi-common/domain.h>
  36
  37 #include <pulse/xmalloc.h>
  38 #include <pulse/util.h>
  39
  40 #include <pulsecore/parseaddr.h>
  41 #include <pulsecore/sink.h>
  42 #include <pulsecore/source.h>
  43 #include <pulsecore/native-common.h>
  44 #include <pulsecore/core-util.h>
  45 #include <pulsecore/log.h>
  46 #include <pulsecore/core-subscribe.h>
  47 #include <pulsecore/dynarray.h>
  48 #include <pulsecore/modargs.h>
  49 #include <pulsecore/avahi-wrap.h>
  50 #include <pulsecore/endianmacros.h>
  51 #include <pulsecore/protocol-native.h>
  52
  53 #include "module-zeroconf-publish-symdef.h"
  54
  55 PA_MODULE_AUTHOR("Lennart Poettering");
  56 PA_MODULE_DESCRIPTION("mDNS/DNS-SD Service Publisher");
  57 PA_MODULE_VERSION(PACKAGE_VERSION);
  58 PA_MODULE_LOAD_ONCE(TRUE);
  59
  60 #define SERVICE_TYPE_SINK "_pulse-sink._tcp"
  61 #define SERVICE_TYPE_SOURCE "_pulse-source._tcp"
  62 #define SERVICE_TYPE_SERVER "_pulse-server._tcp"
  63 #define SERVICE_SUBTYPE_SINK_HARDWARE "_hardware._sub."SERVICE_TYPE_SINK
  64 #define SERVICE_SUBTYPE_SINK_VIRTUAL "_virtual._sub."SERVICE_TYPE_SINK
  65 #define SERVICE_SUBTYPE_SOURCE_HARDWARE "_hardware._sub."SERVICE_TYPE_SOURCE
  66 #define SERVICE_SUBTYPE_SOURCE_VIRTUAL "_virtual._sub."SERVICE_TYPE_SOURCE
  67 #define SERVICE_SUBTYPE_SOURCE_MONITOR "_monitor._sub."SERVICE_TYPE_SOURCE
  68 #define SERVICE_SUBTYPE_SOURCE_NON_MONITOR "_non-monitor._sub."SERVICE_TYPE_SOURCE
  69
  70 static const char* const valid_modargs[] = {
  71     NULL
  72 };
  73
  74 enum service_subtype {
  75     SUBTYPE_HARDWARE,
  76     SUBTYPE_VIRTUAL,
  77     SUBTYPE_MONITOR
  78 };
  79
  80 struct service {
  81     struct userdata *userdata;
  82     AvahiEntryGroup *entry_group;
  83     char *service_name;
  84     pa_object *device;
  85     enum service_subtype subtype;
  86 };
  87
  88 struct userdata {
  89     pa_core *core;
  90     pa_module *module;
  91
  92     AvahiPoll *avahi_poll;
  93     AvahiClient *client;
  94
  95     pa_hashmap *services;
  96     char *service_name;
  97
  98     AvahiEntryGroup *main_entry_group;
  99
 100     pa_hook_slot *sink_new_slot, *source_new_slot, *sink_unlink_slot, *source_unlink_slot, *sink_changed_slot, *source_changed_slot;
 101
 102     pa_native_protocol *native;
 103 };
 104
 105 static void get_service_data(struct service *s, pa_sample_spec *ret_ss, pa_channel_map *ret_map, const char **ret_name, pa_proplist **ret_proplist, enum service_subtype *ret_subtype) {
 106     pa_assert(s);
 107     pa_assert(ret_ss);
 108     pa_assert(ret_proplist);
 109     pa_assert(ret_subtype);
 110
 111     if (pa_sink_isinstance(s->device)) {
 112         pa_sink *sink = PA_SINK(s->device);
 113
 114         *ret_ss = sink->sample_spec;
 115         *ret_map = sink->channel_map;
 116         *ret_name = sink->name;
 117         *ret_proplist = sink->proplist;
 118         *ret_subtype = sink->flags & PA_SINK_HARDWARE ? SUBTYPE_HARDWARE : SUBTYPE_VIRTUAL;
 119
 120     } else if (pa_source_isinstance(s->device)) {
 121         pa_source *source = PA_SOURCE(s->device);
 122
 123         *ret_ss = source->sample_spec;
 124         *ret_map = source->channel_map;
 125         *ret_name = source->name;
 126         *ret_proplist = source->proplist;
 127         *ret_subtype = source->monitor_of ? SUBTYPE_MONITOR : (source->flags & PA_SOURCE_HARDWARE ? SUBTYPE_HARDWARE : SUBTYPE_VIRTUAL);
 128
 129     } else
 130         pa_assert_not_reached();
 131 }
 132
 133 static AvahiStringList* txt_record_server_data(pa_core *c, AvahiStringList *l) {
 134     char s[128];
 135     char *t;
 136
 137     pa_assert(c);
 138
 139     l = avahi_string_list_add_pair(l, "server-version", PACKAGE_NAME" "PACKAGE_VERSION);
 140
 141     t = pa_get_user_name_malloc();
 142     l = avahi_string_list_add_pair(l, "user-name", t);
 143     pa_xfree(t);
 144
 145     t = pa_machine_id();
 146     l = avahi_string_list_add_pair(l, "machine-id", t);
 147     pa_xfree(t);
 148
 149     t = pa_uname_string();
 150     l = avahi_string_list_add_pair(l, "uname", t);
 151     pa_xfree(t);
 152
 153     l = avahi_string_list_add_pair(l, "fqdn", pa_get_fqdn(s, sizeof(s)));
 154     l = avahi_string_list_add_printf(l, "cookie=0x%08x", c->cookie);
 155
 156     return l;
 157 }
 158
 159 static int publish_service(struct service *s);
 160
 161 static void service_entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
 162     struct service *s = userdata;
 163
 164     pa_assert(s);
 165
 166     switch (state) {
 167
 168         case AVAHI_ENTRY_GROUP_ESTABLISHED:
 169             pa_log_info("Successfully established service %s.", s->service_name);
 170             break;
 171
 172         case AVAHI_ENTRY_GROUP_COLLISION: {
 173             char *t;
 174
 175             t = avahi_alternative_service_name(s->service_name);
 176             pa_log_info("Name collision, renaming %s to %s.", s->service_name, t);
 177             pa_xfree(s->service_name);
 178             s->service_name = t;
 179
 180             publish_service(s);
 181             break;
 182         }
 183
 184         case AVAHI_ENTRY_GROUP_FAILURE: {
 185             pa_log("Failed to register service: %s", avahi_strerror(avahi_client_errno(avahi_entry_group_get_client(g))));
 186
 187             avahi_entry_group_free(g);
 188             s->entry_group = NULL;
 189
 190             break;
 191         }
 192
 193         case AVAHI_ENTRY_GROUP_UNCOMMITED:
 194         case AVAHI_ENTRY_GROUP_REGISTERING:
 195             ;
 196     }
 197 }
 198
 199 static void service_free(struct service *s);
 200
 201 static uint16_t compute_port(struct userdata *u) {
 202     pa_strlist *i;
 203
 204     pa_assert(u);
 205
 206     for (i = pa_native_protocol_servers(u->native); i; i = pa_strlist_next(i)) {
 207         pa_parsed_address a;
 208
 209         if (pa_parse_address(pa_strlist_data(i), &a) >= 0 &&
 210             (a.type == PA_PARSED_ADDRESS_TCP4 ||
 211              a.type == PA_PARSED_ADDRESS_TCP6 ||
 212              a.type == PA_PARSED_ADDRESS_TCP_AUTO) &&
 213             a.port > 0) {
 214
 215             pa_xfree(a.path_or_host);
 216             return a.port;
 217         }
 218
 219         pa_xfree(a.path_or_host);
 220     }
 221
 222     return PA_NATIVE_DEFAULT_PORT;
 223 }
 224
 225 static int publish_service(struct service *s) {
 226     int r = -1;
 227     AvahiStringList *txt = NULL;
 228     const char *name = NULL, *t;
 229     pa_proplist *proplist = NULL;
 230     pa_sample_spec ss;
 231     pa_channel_map map;
 232     char cm[PA_CHANNEL_MAP_SNPRINT_MAX];
 233     enum service_subtype subtype;
 234
 235     const char * const subtype_text[] = {
 236         [SUBTYPE_HARDWARE] = "hardware",
 237         [SUBTYPE_VIRTUAL] = "virtual",
 238         [SUBTYPE_MONITOR] = "monitor"
 239     };
 240
 241     pa_assert(s);
 242
 243     if (!s->userdata->client || avahi_client_get_state(s->userdata->client) != AVAHI_CLIENT_S_RUNNING)
 244         return 0;
 245
 246     if (!s->entry_group) {
 247         if (!(s->entry_group = avahi_entry_group_new(s->userdata->client, service_entry_group_callback, s))) {
 248             pa_log("avahi_entry_group_new(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 249             goto finish;
 250         }
 251     } else
 252         avahi_entry_group_reset(s->entry_group);
 253
 254     txt = txt_record_server_data(s->userdata->core, txt);
 255
 256     get_service_data(s, &ss, &map, &name, &proplist, &subtype);
 257     txt = avahi_string_list_add_pair(txt, "device", name);
 258     txt = avahi_string_list_add_printf(txt, "rate=%u", ss.rate);
 259     txt = avahi_string_list_add_printf(txt, "channels=%u", ss.channels);
 260     txt = avahi_string_list_add_pair(txt, "format", pa_sample_format_to_string(ss.format));
 261     txt = avahi_string_list_add_pair(txt, "channel_map", pa_channel_map_snprint(cm, sizeof(cm), &map));
 262     txt = avahi_string_list_add_pair(txt, "subtype", subtype_text[subtype]);
 263
 264     if ((t = pa_proplist_gets(proplist, PA_PROP_DEVICE_DESCRIPTION)))
 265         txt = avahi_string_list_add_pair(txt, "description", t);
 266     if ((t = pa_proplist_gets(proplist, PA_PROP_DEVICE_ICON_NAME)))
 267         txt = avahi_string_list_add_pair(txt, "icon-name", t);
 268     if ((t = pa_proplist_gets(proplist, PA_PROP_DEVICE_VENDOR_NAME)))
 269         txt = avahi_string_list_add_pair(txt, "vendor-name", t);
 270     if ((t = pa_proplist_gets(proplist, PA_PROP_DEVICE_PRODUCT_NAME)))
 271         txt = avahi_string_list_add_pair(txt, "product-name", t);
 272     if ((t = pa_proplist_gets(proplist, PA_PROP_DEVICE_CLASS)))
 273         txt = avahi_string_list_add_pair(txt, "class", t);
 274     if ((t = pa_proplist_gets(proplist, PA_PROP_DEVICE_FORM_FACTOR)))
 275         txt = avahi_string_list_add_pair(txt, "form-factor", t);
 276
 277     if (avahi_entry_group_add_service_strlst(
 278                 s->entry_group,
 279                 AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 280                 0,
 281                 s->service_name,
 282                 pa_sink_isinstance(s->device) ? SERVICE_TYPE_SINK : SERVICE_TYPE_SOURCE,
 283                 NULL,
 284                 NULL,
 285                 compute_port(s->userdata),
 286                 txt) < 0) {
 287
 288         pa_log("avahi_entry_group_add_service_strlst(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 289         goto finish;
 290     }
 291
 292     if (avahi_entry_group_add_service_subtype(
 293                 s->entry_group,
 294                 AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 295                 0,
 296                 s->service_name,
 297                 pa_sink_isinstance(s->device) ? SERVICE_TYPE_SINK : SERVICE_TYPE_SOURCE,
 298                 NULL,
 299                 pa_sink_isinstance(s->device) ? (subtype == SUBTYPE_HARDWARE ? SERVICE_SUBTYPE_SINK_HARDWARE : SERVICE_SUBTYPE_SINK_VIRTUAL) :
 300                 (subtype == SUBTYPE_HARDWARE ? SERVICE_SUBTYPE_SOURCE_HARDWARE : (subtype == SUBTYPE_VIRTUAL ? SERVICE_SUBTYPE_SOURCE_VIRTUAL : SERVICE_SUBTYPE_SOURCE_MONITOR))) < 0) {
 301
 302         pa_log("avahi_entry_group_add_service_subtype(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 303         goto finish;
 304     }
 305
 306     if (pa_source_isinstance(s->device) && subtype != SUBTYPE_MONITOR) {
 307         if (avahi_entry_group_add_service_subtype(
 308                     s->entry_group,
 309                     AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 310                     0,
 311                     s->service_name,
 312                     SERVICE_TYPE_SOURCE,
 313                     NULL,
 314                     SERVICE_SUBTYPE_SOURCE_NON_MONITOR) < 0) {
 315
 316             pa_log("avahi_entry_group_add_service_subtype(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 317             goto finish;
 318         }
 319     }
 320
 321     if (avahi_entry_group_commit(s->entry_group) < 0) {
 322         pa_log("avahi_entry_group_commit(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 323         goto finish;
 324     }
 325
 326     r = 0;
 327     pa_log_debug("Successfully created entry group for %s.", s->service_name);
 328
 329 finish:
 330
 331     /* Remove this service */
 332     if (r < 0)
 333         service_free(s);
 334
 335     avahi_string_list_free(txt);
 336
 337     return r;
 338 }
 339
 340 static struct service *get_service(struct userdata *u, pa_object *device) {
 341     struct service *s;
 342     char *hn, *un;
 343     const char *n;
 344
 345     pa_assert(u);
 346     pa_object_assert_ref(device);
 347
 348     if ((s = pa_hashmap_get(u->services, device)))
 349         return s;
 350
 351     s = pa_xnew(struct service, 1);
 352     s->userdata = u;
 353     s->entry_group = NULL;
 354     s->device = device;
 355
 356     if (pa_sink_isinstance(device)) {
 357         if (!(n = pa_proplist_gets(PA_SINK(device)->proplist, PA_PROP_DEVICE_DESCRIPTION)))
 358             n = PA_SINK(device)->name;
 359     } else {
 360         if (!(n = pa_proplist_gets(PA_SOURCE(device)->proplist, PA_PROP_DEVICE_DESCRIPTION)))
 361             n = PA_SOURCE(device)->name;
 362     }
 363
 364     hn = pa_get_host_name_malloc();
 365     un = pa_get_user_name_malloc();
 366
 367     s->service_name = pa_truncate_utf8(pa_sprintf_malloc("%s@%s: %s", un, hn, n), AVAHI_LABEL_MAX-1);
 368
 369     pa_xfree(un);
 370     pa_xfree(hn);
 371
 372     pa_hashmap_put(u->services, s->device, s);
 373
 374     return s;
 375 }
 376
 377 static void service_free(struct service *s) {
 378     pa_assert(s);
 379
 380     pa_hashmap_remove(s->userdata->services, s->device);
 381
 382     if (s->entry_group) {
 383         pa_log_debug("Removing entry group for %s.", s->service_name);
 384         avahi_entry_group_free(s->entry_group);
 385     }
 386
 387     pa_xfree(s->service_name);
 388     pa_xfree(s);
 389 }
 390
 391 static pa_bool_t shall_ignore(pa_object *o) {
 392     pa_object_assert_ref(o);
 393
 394     if (pa_sink_isinstance(o))
 395         return !!(PA_SINK(o)->flags & PA_SINK_NETWORK);
 396
 397     if (pa_source_isinstance(o))
 398         return PA_SOURCE(o)->monitor_of || (PA_SOURCE(o)->flags & PA_SOURCE_NETWORK);
 399
 400     pa_assert_not_reached();
 401 }
 402
 403 static pa_hook_result_t device_new_or_changed_cb(pa_core *c, pa_object *o, struct userdata *u) {
 404     pa_assert(c);
 405     pa_object_assert_ref(o);
 406
 407     if (!shall_ignore(o))
 408         publish_service(get_service(u, o));
 409
 410     return PA_HOOK_OK;
 411 }
 412
 413 static pa_hook_result_t device_unlink_cb(pa_core *c, pa_object *o, struct userdata *u) {
 414     struct service *s;
 415
 416     pa_assert(c);
 417     pa_object_assert_ref(o);
 418
 419     if ((s = pa_hashmap_get(u->services, o)))
 420         service_free(s);
 421
 422     return PA_HOOK_OK;
 423 }
 424
 425 static int publish_main_service(struct userdata *u);
 426
 427 static void main_entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
 428     struct userdata *u = userdata;
 429     pa_assert(u);
 430
 431     switch (state) {
 432
 433         case AVAHI_ENTRY_GROUP_ESTABLISHED:
 434             pa_log_info("Successfully established main service.");
 435             break;
 436
 437         case AVAHI_ENTRY_GROUP_COLLISION: {
 438             char *t;
 439
 440             t = avahi_alternative_service_name(u->service_name);
 441             pa_log_info("Name collision: renaming main service %s to %s.", u->service_name, t);
 442             pa_xfree(u->service_name);
 443             u->service_name = t;
 444
 445             publish_main_service(u);
 446             break;
 447         }
 448
 449         case AVAHI_ENTRY_GROUP_FAILURE: {
 450             pa_log("Failed to register main service: %s", avahi_strerror(avahi_client_errno(avahi_entry_group_get_client(g))));
 451
 452             avahi_entry_group_free(g);
 453             u->main_entry_group = NULL;
 454             break;
 455         }
 456
 457         case AVAHI_ENTRY_GROUP_UNCOMMITED:
 458         case AVAHI_ENTRY_GROUP_REGISTERING:
 459             break;
 460     }
 461 }
 462
 463 static int publish_main_service(struct userdata *u) {
 464     AvahiStringList *txt = NULL;
 465     int r = -1;
 466
 467     pa_assert(u);
 468
 469     if (!u->main_entry_group) {
 470         if (!(u->main_entry_group = avahi_entry_group_new(u->client, main_entry_group_callback, u))) {
 471             pa_log("avahi_entry_group_new() failed: %s", avahi_strerror(avahi_client_errno(u->client)));
 472             goto fail;
 473         }
 474     } else
 475         avahi_entry_group_reset(u->main_entry_group);
 476
 477     txt = txt_record_server_data(u->core, txt);
 478
 479     if (avahi_entry_group_add_service_strlst(
 480                 u->main_entry_group,
 481                 AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 482                 0,
 483                 u->service_name,
 484                 SERVICE_TYPE_SERVER,
 485                 NULL,
 486                 NULL,
 487                 compute_port(u),
 488                 txt) < 0) {
 489
 490         pa_log("avahi_entry_group_add_service_strlst() failed: %s", avahi_strerror(avahi_client_errno(u->client)));
 491         goto fail;
 492     }
 493
 494     if (avahi_entry_group_commit(u->main_entry_group) < 0) {
 495         pa_log("avahi_entry_group_commit() failed: %s", avahi_strerror(avahi_client_errno(u->client)));
 496         goto fail;
 497     }
 498
 499     r = 0;
 500
 501 fail:
 502     avahi_string_list_free(txt);
 503
 504     return r;
 505 }
 506
 507 static int publish_all_services(struct userdata *u) {
 508     pa_sink *sink;
 509     pa_source *source;
 510     int r = -1;
 511     uint32_t idx;
 512
 513     pa_assert(u);
 514
 515     pa_log_debug("Publishing services in Zeroconf");
 516
 517     for (sink = PA_SINK(pa_idxset_first(u->core->sinks, &idx)); sink; sink = PA_SINK(pa_idxset_next(u->core->sinks, &idx)))
 518         if (!shall_ignore(PA_OBJECT(sink)))
 519             publish_service(get_service(u, PA_OBJECT(sink)));
 520
 521     for (source = PA_SOURCE(pa_idxset_first(u->core->sources, &idx)); source; source = PA_SOURCE(pa_idxset_next(u->core->sources, &idx)))
 522         if (!shall_ignore(PA_OBJECT(source)))
 523             publish_service(get_service(u, PA_OBJECT(source)));
 524
 525     if (publish_main_service(u) < 0)
 526         goto fail;
 527
 528     r = 0;
 529
 530 fail:
 531     return r;
 532 }
 533
 534 static void unpublish_all_services(struct userdata *u, pa_bool_t rem) {
 535     void *state = NULL;
 536     struct service *s;
 537
 538     pa_assert(u);
 539
 540     pa_log_debug("Unpublishing services in Zeroconf");
 541
 542     while ((s = pa_hashmap_iterate(u->services, &state, NULL))) {
 543         if (s->entry_group) {
 544             if (rem) {
 545                 pa_log_debug("Removing entry group for %s.", s->service_name);
 546                 avahi_entry_group_free(s->entry_group);
 547                 s->entry_group = NULL;
 548             } else {
 549                 avahi_entry_group_reset(s->entry_group);
 550                 pa_log_debug("Resetting entry group for %s.", s->service_name);
 551             }
 552         }
 553     }
 554
 555     if (u->main_entry_group) {
 556         if (rem) {
 557             pa_log_debug("Removing main entry group.");
 558             avahi_entry_group_free(u->main_entry_group);
 559             u->main_entry_group = NULL;
 560         } else {
 561             avahi_entry_group_reset(u->main_entry_group);
 562             pa_log_debug("Resetting main entry group.");
 563         }
 564     }
 565 }
 566
 567 static void client_callback(AvahiClient *c, AvahiClientState state, void *userdata) {
 568     struct userdata *u = userdata;
 569
 570     pa_assert(c);
 571     pa_assert(u);
 572
 573     u->client = c;
 574
 575     switch (state) {
 576         case AVAHI_CLIENT_S_RUNNING:
 577             publish_all_services(u);
 578             break;
 579
 580         case AVAHI_CLIENT_S_COLLISION:
 581             pa_log_debug("Host name collision");
 582             unpublish_all_services(u, FALSE);
 583             break;
 584
 585         case AVAHI_CLIENT_FAILURE:
 586             if (avahi_client_errno(c) == AVAHI_ERR_DISCONNECTED) {
 587                 int error;
 588
 589                 pa_log_debug("Avahi daemon disconnected.");
 590
 591                 unpublish_all_services(u, TRUE);
 592                 avahi_client_free(u->client);
 593
 594                 if (!(u->client = avahi_client_new(u->avahi_poll, AVAHI_CLIENT_NO_FAIL, client_callback, u, &error))) {
 595                     pa_log("avahi_client_new() failed: %s", avahi_strerror(error));
 596                     pa_module_unload_request(u->module, TRUE);
 597                 }
 598             }
 599
 600             break;
 601
 602         default: ;
 603     }
 604 }
 605
 606 int pa__init(pa_module*m) {
 607
 608     struct userdata *u;
 609     pa_modargs *ma = NULL;
 610     char *hn, *un;
 611     int error;
 612
 613     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 614         pa_log("Failed to parse module arguments.");
 615         goto fail;
 616     }
 617
 618     m->userdata = u = pa_xnew(struct userdata, 1);
 619     u->core = m->core;
 620     u->module = m;
 621     u->native = pa_native_protocol_get(u->core);
 622
 623     u->avahi_poll = pa_avahi_poll_new(m->core->mainloop);
 624
 625     u->services = pa_hashmap_new(pa_idxset_trivial_hash_func, pa_idxset_trivial_compare_func);
 626
 627     u->sink_new_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_PUT], PA_HOOK_LATE, (pa_hook_cb_t) device_new_or_changed_cb, u);
 628     u->sink_changed_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_PROPLIST_CHANGED], PA_HOOK_LATE, (pa_hook_cb_t) device_new_or_changed_cb, u);
 629     u->sink_unlink_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_UNLINK], PA_HOOK_LATE, (pa_hook_cb_t) device_unlink_cb, u);
 630     u->source_new_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SOURCE_PUT], PA_HOOK_LATE, (pa_hook_cb_t) device_new_or_changed_cb, u);
 631     u->source_changed_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SOURCE_PROPLIST_CHANGED], PA_HOOK_LATE, (pa_hook_cb_t) device_new_or_changed_cb, u);
 632     u->source_unlink_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SOURCE_UNLINK], PA_HOOK_LATE, (pa_hook_cb_t) device_unlink_cb, u);
 633
 634     u->main_entry_group = NULL;
 635
 636     un = pa_get_user_name_malloc();
 637     hn = pa_get_host_name_malloc();
 638     u->service_name = pa_truncate_utf8(pa_sprintf_malloc("%s@%s", un, hn), AVAHI_LABEL_MAX-1);
 639     pa_xfree(un);
 640     pa_xfree(hn);
 641
 642     if (!(u->client = avahi_client_new(u->avahi_poll, AVAHI_CLIENT_NO_FAIL, client_callback, u, &error))) {
 643         pa_log("avahi_client_new() failed: %s", avahi_strerror(error));
 644         goto fail;
 645     }
 646
 647     pa_modargs_free(ma);
 648
 649     return 0;
 650
 651 fail:
 652     pa__done(m);
 653
 654     if (ma)
 655         pa_modargs_free(ma);
 656
 657     return -1;
 658 }
 659
 660 void pa__done(pa_module*m) {
 661     struct userdata*u;
 662     pa_assert(m);
 663
 664     if (!(u = m->userdata))
 665         return;
 666
 667     if (u->services) {
 668         struct service *s;
 669
 670         while ((s = pa_hashmap_first(u->services)))
 671             service_free(s);
 672
 673         pa_hashmap_free(u->services, NULL, NULL);
 674     }
 675
 676     if (u->sink_new_slot)
 677         pa_hook_slot_free(u->sink_new_slot);
 678     if (u->source_new_slot)
 679         pa_hook_slot_free(u->source_new_slot);
 680     if (u->sink_changed_slot)
 681         pa_hook_slot_free(u->sink_changed_slot);
 682     if (u->source_changed_slot)
 683         pa_hook_slot_free(u->source_changed_slot);
 684     if (u->sink_unlink_slot)
 685         pa_hook_slot_free(u->sink_unlink_slot);
 686     if (u->source_unlink_slot)
 687         pa_hook_slot_free(u->source_unlink_slot);
 688
 689     if (u->main_entry_group)
 690         avahi_entry_group_free(u->main_entry_group);
 691
 692     if (u->client)
 693         avahi_client_free(u->client);
 694
 695     if (u->avahi_poll)
 696         pa_avahi_poll_free(u->avahi_poll);
 697
 698     if (u->native)
 699         pa_native_protocol_unref(u->native);
 700
 701     pa_xfree(u->service_name);
 702     pa_xfree(u);
 703 }