code.delx.au - pulseaudio/blob - 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 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/sink.h>
  41 #include <pulsecore/source.h>
  42 #include <pulsecore/native-common.h>
  43 #include <pulsecore/core-util.h>
  44 #include <pulsecore/log.h>
  45 #include <pulsecore/core-subscribe.h>
  46 #include <pulsecore/dynarray.h>
  47 #include <pulsecore/modargs.h>
  48 #include <pulsecore/avahi-wrap.h>
  49 #include <pulsecore/endianmacros.h>
  50
  51 #include "module-zeroconf-publish-symdef.h"
  52
  53 PA_MODULE_AUTHOR("Lennart Poettering");
  54 PA_MODULE_DESCRIPTION("mDNS/DNS-SD Service Publisher");
  55 PA_MODULE_VERSION(PACKAGE_VERSION);
  56 PA_MODULE_LOAD_ONCE(TRUE);
  57 PA_MODULE_USAGE("port=<IP port number>");
  58
  59 #define SERVICE_TYPE_SINK "_pulse-sink._tcp"
  60 #define SERVICE_TYPE_SOURCE "_pulse-source._tcp"
  61 #define SERVICE_TYPE_SERVER "_pulse-server._tcp"
  62 #define SERVICE_SUBTYPE_SINK_HARDWARE "_hardware._sub."SERVICE_TYPE_SINK
  63 #define SERVICE_SUBTYPE_SINK_VIRTUAL "_virtual._sub."SERVICE_TYPE_SINK
  64 #define SERVICE_SUBTYPE_SOURCE_HARDWARE "_hardware._sub."SERVICE_TYPE_SOURCE
  65 #define SERVICE_SUBTYPE_SOURCE_VIRTUAL "_virtual._sub."SERVICE_TYPE_SOURCE
  66 #define SERVICE_SUBTYPE_SOURCE_MONITOR "_monitor._sub."SERVICE_TYPE_SOURCE
  67 #define SERVICE_SUBTYPE_SOURCE_NON_MONITOR "_non-monitor._sub."SERVICE_TYPE_SOURCE
  68
  69 static const char* const valid_modargs[] = {
  70     "port",
  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     AvahiPoll *avahi_poll;
  92     AvahiClient *client;
  93
  94     pa_hashmap *services;
  95     char *service_name;
  96
  97     AvahiEntryGroup *main_entry_group;
  98
  99     uint16_t port;
 100
 101     pa_hook_slot *sink_new_slot, *source_new_slot, *sink_unlink_slot, *source_unlink_slot, *sink_changed_slot, *source_changed_slot;
 102 };
 103
 104 static void get_service_data(struct service *s, pa_sample_spec *ret_ss, pa_channel_map *ret_map, const char **ret_name, const char **ret_description, enum service_subtype *ret_subtype) {
 105     pa_assert(s);
 106     pa_assert(ret_ss);
 107     pa_assert(ret_description);
 108     pa_assert(ret_subtype);
 109
 110     if (pa_sink_isinstance(s->device)) {
 111         pa_sink *sink = PA_SINK(s->device);
 112
 113         *ret_ss = sink->sample_spec;
 114         *ret_map = sink->channel_map;
 115         *ret_name = sink->name;
 116         *ret_description = pa_strnull(pa_proplist_gets(sink->proplist, PA_PROP_DEVICE_DESCRIPTION));
 117         *ret_subtype = sink->flags & PA_SINK_HARDWARE ? SUBTYPE_HARDWARE : SUBTYPE_VIRTUAL;
 118
 119     } else if (pa_source_isinstance(s->device)) {
 120         pa_source *source = PA_SOURCE(s->device);
 121
 122         *ret_ss = source->sample_spec;
 123         *ret_map = source->channel_map;
 124         *ret_name = source->name;
 125         *ret_description = pa_strnull(pa_proplist_gets(source->proplist, PA_PROP_DEVICE_DESCRIPTION));
 126         *ret_subtype = source->monitor_of ? SUBTYPE_MONITOR : (source->flags & PA_SOURCE_HARDWARE ? SUBTYPE_HARDWARE : SUBTYPE_VIRTUAL);
 127
 128     } else
 129         pa_assert_not_reached();
 130 }
 131
 132 static AvahiStringList* txt_record_server_data(pa_core *c, AvahiStringList *l) {
 133     char s[128];
 134
 135     pa_assert(c);
 136
 137     l = avahi_string_list_add_pair(l, "server-version", PACKAGE_NAME" "PACKAGE_VERSION);
 138     l = avahi_string_list_add_pair(l, "user-name", pa_get_user_name(s, sizeof(s)));
 139     l = avahi_string_list_add_pair(l, "fqdn", pa_get_fqdn(s, sizeof(s)));
 140     l = avahi_string_list_add_printf(l, "cookie=0x%08x", c->cookie);
 141
 142     return l;
 143 }
 144
 145 static int publish_service(struct service *s);
 146
 147 static void service_entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
 148     struct service *s = userdata;
 149
 150     pa_assert(s);
 151
 152     switch (state) {
 153
 154         case AVAHI_ENTRY_GROUP_ESTABLISHED:
 155             pa_log_info("Successfully established service %s.", s->service_name);
 156             break;
 157
 158         case AVAHI_ENTRY_GROUP_COLLISION: {
 159             char *t;
 160
 161             t = avahi_alternative_service_name(s->service_name);
 162             pa_log_info("Name collision, renaming %s to %s.", s->service_name, t);
 163             pa_xfree(s->service_name);
 164             s->service_name = t;
 165
 166             publish_service(s);
 167             break;
 168         }
 169
 170         case AVAHI_ENTRY_GROUP_FAILURE: {
 171             pa_log("Failed to register service: %s", avahi_strerror(avahi_client_errno(avahi_entry_group_get_client(g))));
 172
 173             avahi_entry_group_free(g);
 174             s->entry_group = NULL;
 175
 176             break;
 177         }
 178
 179         case AVAHI_ENTRY_GROUP_UNCOMMITED:
 180         case AVAHI_ENTRY_GROUP_REGISTERING:
 181             ;
 182     }
 183 }
 184
 185 static void service_free(struct service *s);
 186
 187 static int publish_service(struct service *s) {
 188     int r = -1;
 189     AvahiStringList *txt = NULL;
 190     const char *description = NULL, *name = NULL;
 191     pa_sample_spec ss;
 192     pa_channel_map map;
 193     char cm[PA_CHANNEL_MAP_SNPRINT_MAX];
 194     enum service_subtype subtype;
 195
 196     const char * const subtype_text[] = {
 197         [SUBTYPE_HARDWARE] = "hardware",
 198         [SUBTYPE_VIRTUAL] = "virtual",
 199         [SUBTYPE_MONITOR] = "monitor"
 200     };
 201
 202     pa_assert(s);
 203
 204     if (!s->userdata->client || avahi_client_get_state(s->userdata->client) != AVAHI_CLIENT_S_RUNNING)
 205         return 0;
 206
 207     if (!s->entry_group) {
 208         if (!(s->entry_group = avahi_entry_group_new(s->userdata->client, service_entry_group_callback, s))) {
 209             pa_log("avahi_entry_group_new(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 210             goto finish;
 211         }
 212     } else
 213         avahi_entry_group_reset(s->entry_group);
 214
 215     txt = txt_record_server_data(s->userdata->core, txt);
 216
 217     get_service_data(s, &ss, &map, &name, &description, &subtype);
 218     txt = avahi_string_list_add_pair(txt, "device", name);
 219     txt = avahi_string_list_add_printf(txt, "rate=%u", ss.rate);
 220     txt = avahi_string_list_add_printf(txt, "channels=%u", ss.channels);
 221     txt = avahi_string_list_add_pair(txt, "format", pa_sample_format_to_string(ss.format));
 222     txt = avahi_string_list_add_pair(txt, "channel_map", pa_channel_map_snprint(cm, sizeof(cm), &map));
 223     txt = avahi_string_list_add_pair(txt, "subtype", subtype_text[subtype]);
 224
 225     if (avahi_entry_group_add_service_strlst(
 226                 s->entry_group,
 227                 AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 228                 0,
 229                 s->service_name,
 230                 pa_sink_isinstance(s->device) ? SERVICE_TYPE_SINK : SERVICE_TYPE_SOURCE,
 231                 NULL,
 232                 NULL,
 233                 s->userdata->port,
 234                 txt) < 0) {
 235
 236         pa_log("avahi_entry_group_add_service_strlst(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 237         goto finish;
 238     }
 239
 240     if (avahi_entry_group_add_service_subtype(
 241                 s->entry_group,
 242                 AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 243                 0,
 244                 s->service_name,
 245                 pa_sink_isinstance(s->device) ? SERVICE_TYPE_SINK : SERVICE_TYPE_SOURCE,
 246                 NULL,
 247                 pa_sink_isinstance(s->device) ? (subtype == SUBTYPE_HARDWARE ? SERVICE_SUBTYPE_SINK_HARDWARE : SERVICE_SUBTYPE_SINK_VIRTUAL) :
 248                 (subtype == SUBTYPE_HARDWARE ? SERVICE_SUBTYPE_SOURCE_HARDWARE : (subtype == SUBTYPE_VIRTUAL ? SERVICE_SUBTYPE_SOURCE_VIRTUAL : SERVICE_SUBTYPE_SOURCE_MONITOR))) < 0) {
 249
 250         pa_log("avahi_entry_group_add_service_subtype(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 251         goto finish;
 252     }
 253
 254     if (pa_source_isinstance(s->device) && subtype != SUBTYPE_MONITOR) {
 255         if (avahi_entry_group_add_service_subtype(
 256                     s->entry_group,
 257                     AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 258                     0,
 259                     s->service_name,
 260                     SERVICE_TYPE_SOURCE,
 261                     NULL,
 262                     SERVICE_SUBTYPE_SOURCE_NON_MONITOR) < 0) {
 263
 264             pa_log("avahi_entry_group_add_service_subtype(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 265             goto finish;
 266         }
 267     }
 268
 269     if (avahi_entry_group_commit(s->entry_group) < 0) {
 270         pa_log("avahi_entry_group_commit(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 271         goto finish;
 272     }
 273
 274     r = 0;
 275     pa_log_debug("Successfully created entry group for %s.", s->service_name);
 276
 277 finish:
 278
 279     /* Remove this service */
 280     if (r < 0)
 281         service_free(s);
 282
 283     avahi_string_list_free(txt);
 284
 285     return r;
 286 }
 287
 288 static struct service *get_service(struct userdata *u, pa_object *device) {
 289     struct service *s;
 290     char hn[64], un[64];
 291     const char *n;
 292
 293     pa_assert(u);
 294     pa_object_assert_ref(device);
 295
 296     if ((s = pa_hashmap_get(u->services, device)))
 297         return s;
 298
 299     s = pa_xnew(struct service, 1);
 300     s->userdata = u;
 301     s->entry_group = NULL;
 302     s->device = device;
 303
 304     if (pa_sink_isinstance(device)) {
 305         if (!(n = pa_proplist_gets(PA_SINK(device)->proplist, PA_PROP_DEVICE_DESCRIPTION)))
 306             n = PA_SINK(device)->name;
 307     } else {
 308         if (!(n = pa_proplist_gets(PA_SOURCE(device)->proplist, PA_PROP_DEVICE_DESCRIPTION)))
 309             n = PA_SOURCE(device)->name;
 310     }
 311
 312     s->service_name = pa_truncate_utf8(pa_sprintf_malloc("%s@%s: %s",
 313                                                          pa_get_user_name(un, sizeof(un)),
 314                                                          pa_get_host_name(hn, sizeof(hn)),
 315                                                          n),
 316                                        AVAHI_LABEL_MAX-1);
 317
 318     pa_hashmap_put(u->services, s->device, s);
 319
 320     return s;
 321 }
 322
 323 static void service_free(struct service *s) {
 324     pa_assert(s);
 325
 326     pa_hashmap_remove(s->userdata->services, s->device);
 327
 328     if (s->entry_group) {
 329         pa_log_debug("Removing entry group for %s.", s->service_name);
 330         avahi_entry_group_free(s->entry_group);
 331     }
 332
 333     pa_xfree(s->service_name);
 334     pa_xfree(s);
 335 }
 336
 337 static pa_bool_t shall_ignore(pa_object *o) {
 338     pa_object_assert_ref(o);
 339
 340     if (pa_sink_isinstance(o))
 341         return !!(PA_SINK(o)->flags & PA_SINK_NETWORK);
 342
 343     if (pa_source_isinstance(o))
 344         return PA_SOURCE(o)->monitor_of || (PA_SOURCE(o)->flags & PA_SOURCE_NETWORK);
 345
 346     pa_assert_not_reached();
 347 }
 348
 349 static pa_hook_result_t device_new_or_changed_cb(pa_core *c, pa_object *o, struct userdata *u) {
 350     pa_assert(c);
 351     pa_object_assert_ref(o);
 352
 353     if (!shall_ignore(o))
 354         publish_service(get_service(u, o));
 355
 356     return PA_HOOK_OK;
 357 }
 358
 359 static pa_hook_result_t device_unlink_cb(pa_core *c, pa_object *o, struct userdata *u) {
 360     struct service *s;
 361
 362     pa_assert(c);
 363     pa_object_assert_ref(o);
 364
 365     if ((s = pa_hashmap_get(u->services, o)))
 366         service_free(s);
 367
 368     return PA_HOOK_OK;
 369 }
 370
 371 static int publish_main_service(struct userdata *u);
 372
 373 static void main_entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
 374     struct userdata *u = userdata;
 375     pa_assert(u);
 376
 377     switch (state) {
 378
 379         case AVAHI_ENTRY_GROUP_ESTABLISHED:
 380             pa_log_info("Successfully established main service.");
 381             break;
 382
 383         case AVAHI_ENTRY_GROUP_COLLISION: {
 384             char *t;
 385
 386             t = avahi_alternative_service_name(u->service_name);
 387             pa_log_info("Name collision: renaming main service %s to %s.", u->service_name, t);
 388             pa_xfree(u->service_name);
 389             u->service_name = t;
 390
 391             publish_main_service(u);
 392             break;
 393         }
 394
 395         case AVAHI_ENTRY_GROUP_FAILURE: {
 396             pa_log("Failed to register main service: %s", avahi_strerror(avahi_client_errno(avahi_entry_group_get_client(g))));
 397
 398             avahi_entry_group_free(g);
 399             u->main_entry_group = NULL;
 400             break;
 401         }
 402
 403         case AVAHI_ENTRY_GROUP_UNCOMMITED:
 404         case AVAHI_ENTRY_GROUP_REGISTERING:
 405             break;
 406     }
 407 }
 408
 409 static int publish_main_service(struct userdata *u) {
 410     AvahiStringList *txt = NULL;
 411     int r = -1;
 412
 413     pa_assert(u);
 414
 415     if (!u->main_entry_group) {
 416         if (!(u->main_entry_group = avahi_entry_group_new(u->client, main_entry_group_callback, u))) {
 417             pa_log("avahi_entry_group_new() failed: %s", avahi_strerror(avahi_client_errno(u->client)));
 418             goto fail;
 419         }
 420     } else
 421         avahi_entry_group_reset(u->main_entry_group);
 422
 423     txt = txt_record_server_data(u->core, txt);
 424
 425     if (avahi_entry_group_add_service_strlst(
 426                 u->main_entry_group,
 427                 AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 428                 0,
 429                 u->service_name,
 430                 SERVICE_TYPE_SERVER,
 431                 NULL,
 432                 NULL,
 433                 u->port,
 434                 txt) < 0) {
 435
 436         pa_log("avahi_entry_group_add_service_strlst() failed: %s", avahi_strerror(avahi_client_errno(u->client)));
 437         goto fail;
 438     }
 439
 440     if (avahi_entry_group_commit(u->main_entry_group) < 0) {
 441         pa_log("avahi_entry_group_commit() failed: %s", avahi_strerror(avahi_client_errno(u->client)));
 442         goto fail;
 443     }
 444
 445     r = 0;
 446
 447 fail:
 448     avahi_string_list_free(txt);
 449
 450     return r;
 451 }
 452
 453 static int publish_all_services(struct userdata *u) {
 454     pa_sink *sink;
 455     pa_source *source;
 456     int r = -1;
 457     uint32_t idx;
 458
 459     pa_assert(u);
 460
 461     pa_log_debug("Publishing services in Zeroconf");
 462
 463     for (sink = PA_SINK(pa_idxset_first(u->core->sinks, &idx)); sink; sink = PA_SINK(pa_idxset_next(u->core->sinks, &idx)))
 464         if (!shall_ignore(PA_OBJECT(sink)))
 465             publish_service(get_service(u, PA_OBJECT(sink)));
 466
 467     for (source = PA_SOURCE(pa_idxset_first(u->core->sources, &idx)); source; source = PA_SOURCE(pa_idxset_next(u->core->sources, &idx)))
 468         if (!shall_ignore(PA_OBJECT(source)))
 469             publish_service(get_service(u, PA_OBJECT(source)));
 470
 471     if (publish_main_service(u) < 0)
 472         goto fail;
 473
 474     r = 0;
 475
 476 fail:
 477     return r;
 478 }
 479
 480 static void unpublish_all_services(struct userdata *u, pa_bool_t rem) {
 481     void *state = NULL;
 482     struct service *s;
 483
 484     pa_assert(u);
 485
 486     pa_log_debug("Unpublishing services in Zeroconf");
 487
 488     while ((s = pa_hashmap_iterate(u->services, &state, NULL))) {
 489         if (s->entry_group) {
 490             if (rem) {
 491                 pa_log_debug("Removing entry group for %s.", s->service_name);
 492                 avahi_entry_group_free(s->entry_group);
 493                 s->entry_group = NULL;
 494             } else {
 495                 avahi_entry_group_reset(s->entry_group);
 496                 pa_log_debug("Resetting entry group for %s.", s->service_name);
 497             }
 498         }
 499     }
 500
 501     if (u->main_entry_group) {
 502         if (rem) {
 503             pa_log_debug("Removing main entry group.");
 504             avahi_entry_group_free(u->main_entry_group);
 505             u->main_entry_group = NULL;
 506         } else {
 507             avahi_entry_group_reset(u->main_entry_group);
 508             pa_log_debug("Resetting main entry group.");
 509         }
 510     }
 511 }
 512
 513 static void client_callback(AvahiClient *c, AvahiClientState state, void *userdata) {
 514     struct userdata *u = userdata;
 515
 516     pa_assert(c);
 517     pa_assert(u);
 518
 519     u->client = c;
 520
 521     switch (state) {
 522         case AVAHI_CLIENT_S_RUNNING:
 523             publish_all_services(u);
 524             break;
 525
 526         case AVAHI_CLIENT_S_COLLISION:
 527             pa_log_debug("Host name collision");
 528             unpublish_all_services(u, FALSE);
 529             break;
 530
 531         case AVAHI_CLIENT_FAILURE:
 532             if (avahi_client_errno(c) == AVAHI_ERR_DISCONNECTED) {
 533                 int error;
 534
 535                 pa_log_debug("Avahi daemon disconnected.");
 536
 537                 unpublish_all_services(u, TRUE);
 538                 avahi_client_free(u->client);
 539
 540                 if (!(u->client = avahi_client_new(u->avahi_poll, AVAHI_CLIENT_NO_FAIL, client_callback, u, &error))) {
 541                     pa_log("avahi_client_new() failed: %s", avahi_strerror(error));
 542                     pa_module_unload_request(u->module, TRUE);
 543                 }
 544             }
 545
 546             break;
 547
 548         default: ;
 549     }
 550 }
 551
 552 int pa__init(pa_module*m) {
 553
 554     struct userdata *u;
 555     uint32_t port = PA_NATIVE_DEFAULT_PORT;
 556     pa_modargs *ma = NULL;
 557     char hn[256], un[256];
 558     int error;
 559
 560     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 561         pa_log("Failed to parse module arguments.");
 562         goto fail;
 563     }
 564
 565     if (pa_modargs_get_value_u32(ma, "port", &port) < 0 || port <= 0 || port > 0xFFFF) {
 566         pa_log("Invalid port specified.");
 567         goto fail;
 568     }
 569
 570     m->userdata = u = pa_xnew(struct userdata, 1);
 571     u->core = m->core;
 572     u->module = m;
 573     u->port = (uint16_t) port;
 574
 575     u->avahi_poll = pa_avahi_poll_new(m->core->mainloop);
 576
 577     u->services = pa_hashmap_new(pa_idxset_trivial_hash_func, pa_idxset_trivial_compare_func);
 578
 579     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);
 580     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);
 581     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);
 582     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);
 583     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);
 584     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);
 585
 586     u->main_entry_group = NULL;
 587
 588     u->service_name = pa_truncate_utf8(pa_sprintf_malloc("%s@%s", pa_get_user_name(un, sizeof(un)), pa_get_host_name(hn, sizeof(hn))), AVAHI_LABEL_MAX);
 589
 590     if (!(u->client = avahi_client_new(u->avahi_poll, AVAHI_CLIENT_NO_FAIL, client_callback, u, &error))) {
 591         pa_log("avahi_client_new() failed: %s", avahi_strerror(error));
 592         goto fail;
 593     }
 594
 595     pa_modargs_free(ma);
 596
 597     return 0;
 598
 599 fail:
 600     pa__done(m);
 601
 602     if (ma)
 603         pa_modargs_free(ma);
 604
 605     return -1;
 606 }
 607
 608 void pa__done(pa_module*m) {
 609     struct userdata*u;
 610     pa_assert(m);
 611
 612     if (!(u = m->userdata))
 613         return;
 614
 615     if (u->services) {
 616         struct service *s;
 617
 618         while ((s = pa_hashmap_first(u->services)))
 619             service_free(s);
 620
 621         pa_hashmap_free(u->services, NULL, NULL);
 622     }
 623
 624     if (u->sink_new_slot)
 625         pa_hook_slot_free(u->sink_new_slot);
 626     if (u->source_new_slot)
 627         pa_hook_slot_free(u->source_new_slot);
 628     if (u->sink_changed_slot)
 629         pa_hook_slot_free(u->sink_changed_slot);
 630     if (u->source_changed_slot)
 631         pa_hook_slot_free(u->source_changed_slot);
 632     if (u->sink_unlink_slot)
 633         pa_hook_slot_free(u->sink_unlink_slot);
 634     if (u->source_unlink_slot)
 635         pa_hook_slot_free(u->source_unlink_slot);
 636
 637     if (u->main_entry_group)
 638         avahi_entry_group_free(u->main_entry_group);
 639
 640     if (u->client)
 641         avahi_client_free(u->client);
 642
 643     if (u->avahi_poll)
 644         pa_avahi_poll_free(u->avahi_poll);
 645
 646     pa_xfree(u->service_name);
 647     pa_xfree(u);
 648 }