src/modules/module-zeroconf-publish.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as
  10   published by the Free Software Foundation; either version 2 of the
  11   License, or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public
  19   License along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <stdio.h>
  29 #include <assert.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33
  34 #include <avahi-client/client.h>
  35 #include <avahi-client/publish.h>
  36 #include <avahi-common/alternative.h>
  37 #include <avahi-common/error.h>
  38
  39 #include <pulse/xmalloc.h>
  40 #include <pulse/util.h>
  41
  42 #include <pulsecore/autoload.h>
  43 #include <pulsecore/sink.h>
  44 #include <pulsecore/source.h>
  45 #include <pulsecore/native-common.h>
  46 #include <pulsecore/core-util.h>
  47 #include <pulsecore/log.h>
  48 #include <pulsecore/core-subscribe.h>
  49 #include <pulsecore/dynarray.h>
  50 #include <pulsecore/modargs.h>
  51 #include <pulsecore/avahi-wrap.h>
  52 #include <pulsecore/endianmacros.h>
  53
  54 #include "module-zeroconf-publish-symdef.h"
  55
  56 PA_MODULE_AUTHOR("Lennart Poettering")
  57 PA_MODULE_DESCRIPTION("mDNS/DNS-SD Service Publisher")
  58 PA_MODULE_VERSION(PACKAGE_VERSION)
  59 PA_MODULE_USAGE("port=<IP port number>")
  60
  61 #define SERVICE_TYPE_SINK "_pulse-sink._tcp"
  62 #define SERVICE_TYPE_SOURCE "_pulse-source._tcp"
  63 #define SERVICE_TYPE_SERVER "_pulse-server._tcp"
  64
  65 static const char* const valid_modargs[] = {
  66     "port",
  67     NULL
  68 };
  69
  70 struct service {
  71     struct userdata *userdata;
  72     AvahiEntryGroup *entry_group;
  73     char *service_name;
  74     char *name;
  75     enum  { UNPUBLISHED, PUBLISHED_REAL, PUBLISHED_AUTOLOAD } published ;
  76
  77     struct {
  78         int valid;
  79         pa_namereg_type_t type;
  80         uint32_t index;
  81     } loaded;
  82
  83     struct {
  84         int valid;
  85         pa_namereg_type_t type;
  86         uint32_t index;
  87     } autoload;
  88 };
  89
  90 struct userdata {
  91     pa_core *core;
  92     AvahiPoll *avahi_poll;
  93     AvahiClient *client;
  94     pa_hashmap *services;
  95     pa_dynarray *sink_dynarray, *source_dynarray, *autoload_dynarray;
  96     pa_subscription *subscription;
  97     char *service_name;
  98
  99     AvahiEntryGroup *main_entry_group;
 100
 101     uint16_t port;
 102 };
 103
 104 static void get_service_data(struct userdata *u, struct service *s, pa_sample_spec *ret_ss, char **ret_description) {
 105     assert(u && s && s->loaded.valid && ret_ss && ret_description);
 106
 107     if (s->loaded.type == PA_NAMEREG_SINK) {
 108         pa_sink *sink = pa_idxset_get_by_index(u->core->sinks, s->loaded.index);
 109         assert(sink);
 110         *ret_ss = sink->sample_spec;
 111         *ret_description = sink->description;
 112     } else if (s->loaded.type == PA_NAMEREG_SOURCE) {
 113         pa_source *source = pa_idxset_get_by_index(u->core->sources, s->loaded.index);
 114         assert(source);
 115         *ret_ss = source->sample_spec;
 116         *ret_description = source->description;
 117     } else
 118         assert(0);
 119 }
 120
 121 static AvahiStringList* txt_record_server_data(pa_core *c, AvahiStringList *l) {
 122     char s[128];
 123     assert(c);
 124
 125     l = avahi_string_list_add_pair(l, "server-version", PACKAGE_NAME" "PACKAGE_VERSION);
 126     l = avahi_string_list_add_pair(l, "user-name", pa_get_user_name(s, sizeof(s)));
 127     l = avahi_string_list_add_pair(l, "fqdn", pa_get_fqdn(s, sizeof(s)));
 128     l = avahi_string_list_add_printf(l, "cookie=0x%08x", c->cookie);
 129
 130     return l;
 131 }
 132
 133 static int publish_service(struct userdata *u, struct service *s);
 134
 135 static void service_entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
 136     struct service *s = userdata;
 137
 138     if (state == AVAHI_ENTRY_GROUP_COLLISION) {
 139         char *t;
 140
 141         t = avahi_alternative_service_name(s->service_name);
 142         pa_xfree(s->service_name);
 143         s->service_name = t;
 144
 145         publish_service(s->userdata, s);
 146     }
 147 }
 148
 149 static int publish_service(struct userdata *u, struct service *s) {
 150     int r = -1;
 151     AvahiStringList *txt = NULL;
 152
 153     assert(u);
 154     assert(s);
 155
 156     if (!u->client || avahi_client_get_state(u->client) != AVAHI_CLIENT_S_RUNNING)
 157         return 0;
 158
 159     if ((s->published == PUBLISHED_REAL && s->loaded.valid) ||
 160         (s->published == PUBLISHED_AUTOLOAD && s->autoload.valid && !s->loaded.valid))
 161         return 0;
 162
 163     if (s->published != UNPUBLISHED) {
 164         avahi_entry_group_reset(s->entry_group);
 165         s->published = UNPUBLISHED;
 166     }
 167
 168     if (s->loaded.valid || s->autoload.valid) {
 169         pa_namereg_type_t type;
 170
 171         if (!s->entry_group) {
 172             if (!(s->entry_group = avahi_entry_group_new(u->client, service_entry_group_callback, s))) {
 173                 pa_log("avahi_entry_group_new(): %s", avahi_strerror(avahi_client_errno(u->client)));
 174                 goto finish;
 175             }
 176         }
 177
 178         txt = avahi_string_list_add_pair(txt, "device", s->name);
 179         txt = txt_record_server_data(u->core, txt);
 180
 181         if (s->loaded.valid) {
 182             char *description;
 183             pa_sample_spec ss;
 184
 185             get_service_data(u, s, &ss, &description);
 186
 187             txt = avahi_string_list_add_printf(txt, "rate=%u", ss.rate);
 188             txt = avahi_string_list_add_printf(txt, "channels=%u", ss.channels);
 189             txt = avahi_string_list_add_pair(txt, "format", pa_sample_format_to_string(ss.format));
 190             if (description)
 191                 txt = avahi_string_list_add_pair(txt, "description", description);
 192
 193             type = s->loaded.type;
 194         } else if (s->autoload.valid)
 195             type = s->autoload.type;
 196
 197         if (avahi_entry_group_add_service_strlst(
 198                     s->entry_group,
 199                     AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 200                     0,
 201                     s->service_name,
 202                     type == PA_NAMEREG_SINK ? SERVICE_TYPE_SINK : SERVICE_TYPE_SOURCE,
 203                     NULL,
 204                     NULL,
 205                     u->port,
 206                     txt) < 0) {
 207
 208             pa_log("avahi_entry_group_add_service_strlst(): %s", avahi_strerror(avahi_client_errno(u->client)));
 209             goto finish;
 210         }
 211
 212         if (avahi_entry_group_commit(s->entry_group) < 0) {
 213             pa_log("avahi_entry_group_commit(): %s", avahi_strerror(avahi_client_errno(u->client)));
 214             goto finish;
 215         }
 216
 217         if (s->loaded.valid)
 218             s->published = PUBLISHED_REAL;
 219         else if (s->autoload.valid)
 220             s->published = PUBLISHED_AUTOLOAD;
 221     }
 222
 223     r = 0;
 224
 225 finish:
 226
 227     if (s->published == UNPUBLISHED) {
 228         /* Remove this service */
 229
 230         if (s->entry_group)
 231             avahi_entry_group_free(s->entry_group);
 232
 233         pa_hashmap_remove(u->services, s->name);
 234         pa_xfree(s->name);
 235         pa_xfree(s->service_name);
 236         pa_xfree(s);
 237     }
 238
 239     if (txt)
 240         avahi_string_list_free(txt);
 241
 242     return r;
 243 }
 244
 245 static struct service *get_service(struct userdata *u, const char *name, const char *description) {
 246     struct service *s;
 247     char hn[64];
 248
 249     if ((s = pa_hashmap_get(u->services, name)))
 250         return s;
 251
 252     s = pa_xnew(struct service, 1);
 253     s->userdata = u;
 254     s->entry_group = NULL;
 255     s->published = UNPUBLISHED;
 256     s->name = pa_xstrdup(name);
 257     s->loaded.valid = s->autoload.valid = 0;
 258     s->service_name = pa_sprintf_malloc("%s on %s", description ? description : s->name, pa_get_host_name(hn, sizeof(hn)));
 259
 260     pa_hashmap_put(u->services, s->name, s);
 261
 262     return s;
 263 }
 264
 265 static int publish_sink(struct userdata *u, pa_sink *s) {
 266     struct service *svc;
 267     int ret;
 268     assert(u && s);
 269
 270     svc = get_service(u, s->name, s->description);
 271     if (svc->loaded.valid)
 272         return publish_service(u, svc);
 273
 274     svc->loaded.valid = 1;
 275     svc->loaded.type = PA_NAMEREG_SINK;
 276     svc->loaded.index = s->index;
 277
 278     if ((ret = publish_service(u, svc)) < 0)
 279         return ret;
 280
 281     pa_dynarray_put(u->sink_dynarray, s->index, svc);
 282     return ret;
 283 }
 284
 285 static int publish_source(struct userdata *u, pa_source *s) {
 286     struct service *svc;
 287     int ret;
 288
 289     assert(u && s);
 290
 291     svc = get_service(u, s->name, s->description);
 292     if (svc->loaded.valid)
 293         return publish_service(u, svc);
 294
 295     svc->loaded.valid = 1;
 296     svc->loaded.type = PA_NAMEREG_SOURCE;
 297     svc->loaded.index = s->index;
 298
 299     pa_dynarray_put(u->source_dynarray, s->index, svc);
 300
 301     if ((ret = publish_service(u, svc)) < 0)
 302         return ret;
 303
 304     pa_dynarray_put(u->sink_dynarray, s->index, svc);
 305     return ret;
 306 }
 307
 308 static int publish_autoload(struct userdata *u, pa_autoload_entry *s) {
 309     struct service *svc;
 310     int ret;
 311
 312     assert(u && s);
 313
 314     svc = get_service(u, s->name, NULL);
 315     if (svc->autoload.valid)
 316         return publish_service(u, svc);
 317
 318     svc->autoload.valid = 1;
 319     svc->autoload.type = s->type;
 320     svc->autoload.index = s->index;
 321
 322     if ((ret = publish_service(u, svc)) < 0)
 323         return ret;
 324
 325     pa_dynarray_put(u->autoload_dynarray, s->index, svc);
 326     return ret;
 327 }
 328
 329 static int remove_sink(struct userdata *u, uint32_t idx) {
 330     struct service *svc;
 331     assert(u && idx != PA_INVALID_INDEX);
 332
 333     if (!(svc = pa_dynarray_get(u->sink_dynarray, idx)))
 334         return 0;
 335
 336     if (!svc->loaded.valid || svc->loaded.type != PA_NAMEREG_SINK)
 337         return 0;
 338
 339     svc->loaded.valid = 0;
 340     pa_dynarray_put(u->sink_dynarray, idx, NULL);
 341
 342     return publish_service(u, svc);
 343 }
 344
 345 static int remove_source(struct userdata *u, uint32_t idx) {
 346     struct service *svc;
 347     assert(u && idx != PA_INVALID_INDEX);
 348
 349     if (!(svc = pa_dynarray_get(u->source_dynarray, idx)))
 350         return 0;
 351
 352     if (!svc->loaded.valid || svc->loaded.type != PA_NAMEREG_SOURCE)
 353         return 0;
 354
 355     svc->loaded.valid = 0;
 356     pa_dynarray_put(u->source_dynarray, idx, NULL);
 357
 358     return publish_service(u, svc);
 359 }
 360
 361 static int remove_autoload(struct userdata *u, uint32_t idx) {
 362     struct service *svc;
 363     assert(u && idx != PA_INVALID_INDEX);
 364
 365     if (!(svc = pa_dynarray_get(u->autoload_dynarray, idx)))
 366         return 0;
 367
 368     if (!svc->autoload.valid)
 369         return 0;
 370
 371     svc->autoload.valid = 0;
 372     pa_dynarray_put(u->autoload_dynarray, idx, NULL);
 373
 374     return publish_service(u, svc);
 375 }
 376
 377 static void subscribe_callback(pa_core *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
 378     struct userdata *u = userdata;
 379     assert(u && c);
 380
 381     switch (t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK)
 382         case PA_SUBSCRIPTION_EVENT_SINK: {
 383             if ((t & PA_SUBSCRIPTION_EVENT_TYPE_MASK) == PA_SUBSCRIPTION_EVENT_NEW) {
 384                 pa_sink *sink;
 385
 386                 if ((sink = pa_idxset_get_by_index(c->sinks, idx))) {
 387                     if (publish_sink(u, sink) < 0)
 388                         goto fail;
 389                 }
 390             } else if ((t & PA_SUBSCRIPTION_EVENT_TYPE_MASK) == PA_SUBSCRIPTION_EVENT_REMOVE) {
 391                 if (remove_sink(u, idx) < 0)
 392                     goto fail;
 393             }
 394
 395             break;
 396
 397         case PA_SUBSCRIPTION_EVENT_SOURCE:
 398
 399             if ((t & PA_SUBSCRIPTION_EVENT_TYPE_MASK) == PA_SUBSCRIPTION_EVENT_NEW) {
 400                 pa_source *source;
 401
 402                 if ((source = pa_idxset_get_by_index(c->sources, idx))) {
 403                     if (publish_source(u, source) < 0)
 404                         goto fail;
 405                 }
 406             } else if ((t & PA_SUBSCRIPTION_EVENT_TYPE_MASK) == PA_SUBSCRIPTION_EVENT_REMOVE) {
 407                 if (remove_source(u, idx) < 0)
 408                     goto fail;
 409             }
 410
 411             break;
 412
 413         case PA_SUBSCRIPTION_EVENT_AUTOLOAD:
 414             if ((t & PA_SUBSCRIPTION_EVENT_TYPE_MASK) == PA_SUBSCRIPTION_EVENT_NEW) {
 415                 pa_autoload_entry *autoload;
 416
 417                 if ((autoload = pa_idxset_get_by_index(c->autoload_idxset, idx))) {
 418                     if (publish_autoload(u, autoload) < 0)
 419                         goto fail;
 420                 }
 421             } else if ((t & PA_SUBSCRIPTION_EVENT_TYPE_MASK) == PA_SUBSCRIPTION_EVENT_REMOVE) {
 422                 if (remove_autoload(u, idx) < 0)
 423                         goto fail;
 424             }
 425
 426             break;
 427     }
 428
 429     return;
 430
 431 fail:
 432     if (u->subscription) {
 433         pa_subscription_free(u->subscription);
 434         u->subscription = NULL;
 435     }
 436 }
 437
 438 static int publish_main_service(struct userdata *u);
 439
 440 static void main_entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
 441     struct userdata *u = userdata;
 442     assert(u);
 443
 444     if (state == AVAHI_ENTRY_GROUP_COLLISION) {
 445         char *t;
 446
 447         t = avahi_alternative_service_name(u->service_name);
 448         pa_xfree(u->service_name);
 449         u->service_name = t;
 450
 451         publish_main_service(u);
 452     }
 453 }
 454
 455 static int publish_main_service(struct userdata *u) {
 456     AvahiStringList *txt = NULL;
 457     int r = -1;
 458
 459     if (!u->main_entry_group) {
 460         if (!(u->main_entry_group = avahi_entry_group_new(u->client, main_entry_group_callback, u))) {
 461             pa_log("avahi_entry_group_new() failed: %s", avahi_strerror(avahi_client_errno(u->client)));
 462             goto fail;
 463         }
 464     } else
 465         avahi_entry_group_reset(u->main_entry_group);
 466
 467     txt = txt_record_server_data(u->core, NULL);
 468
 469     if (avahi_entry_group_add_service_strlst(
 470                 u->main_entry_group,
 471                 AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 472                 0,
 473                 u->service_name,
 474                 SERVICE_TYPE_SERVER,
 475                 NULL,
 476                 NULL,
 477                 u->port,
 478                 txt) < 0) {
 479
 480         pa_log("avahi_entry_group_add_service_strlst() failed: %s", avahi_strerror(avahi_client_errno(u->client)));
 481         goto fail;
 482     }
 483
 484     if (avahi_entry_group_commit(u->main_entry_group) < 0) {
 485         pa_log("avahi_entry_group_commit() failed: %s", avahi_strerror(avahi_client_errno(u->client)));
 486         goto fail;
 487     }
 488
 489     r = 0;
 490
 491 fail:
 492     avahi_string_list_free(txt);
 493
 494     return r;
 495 }
 496
 497 static int publish_all_services(struct userdata *u) {
 498     pa_sink *sink;
 499     pa_source *source;
 500     pa_autoload_entry *autoload;
 501     int r = -1;
 502     uint32_t idx;
 503
 504     assert(u);
 505
 506     pa_log_debug("Publishing services in Zeroconf");
 507
 508     for (sink = pa_idxset_first(u->core->sinks, &idx); sink; sink = pa_idxset_next(u->core->sinks, &idx))
 509         if (publish_sink(u, sink) < 0)
 510             goto fail;
 511
 512     for (source = pa_idxset_first(u->core->sources, &idx); source; source = pa_idxset_next(u->core->sources, &idx))
 513         if (publish_source(u, source) < 0)
 514             goto fail;
 515
 516     if (u->core->autoload_idxset)
 517         for (autoload = pa_idxset_first(u->core->autoload_idxset, &idx); autoload; autoload = pa_idxset_next(u->core->autoload_idxset, &idx))
 518             if (publish_autoload(u, autoload) < 0)
 519                 goto fail;
 520
 521     if (publish_main_service(u) < 0)
 522         goto fail;
 523
 524     r = 0;
 525
 526 fail:
 527     return r;
 528 }
 529
 530 static void unpublish_all_services(struct userdata *u, int rem) {
 531     void *state = NULL;
 532     struct service *s;
 533
 534     assert(u);
 535
 536     pa_log_debug("Unpublishing services in Zeroconf");
 537
 538     while ((s = pa_hashmap_iterate(u->services, &state, NULL))) {
 539         if (s->entry_group) {
 540             if (rem) {
 541                 avahi_entry_group_free(s->entry_group);
 542                 s->entry_group = NULL;
 543             } else
 544                 avahi_entry_group_reset(s->entry_group);
 545         }
 546
 547         s->published = UNPUBLISHED;
 548     }
 549
 550     if (u->main_entry_group) {
 551         if (rem) {
 552             avahi_entry_group_free(u->main_entry_group);
 553             u->main_entry_group = NULL;
 554         } else
 555             avahi_entry_group_reset(u->main_entry_group);
 556     }
 557 }
 558
 559 static void client_callback(AvahiClient *c, AvahiClientState state, void *userdata) {
 560     struct userdata *u = userdata;
 561     assert(c);
 562
 563     u->client = c;
 564
 565     switch (state) {
 566         case AVAHI_CLIENT_S_RUNNING:
 567             publish_all_services(u);
 568             break;
 569
 570         case AVAHI_CLIENT_S_COLLISION:
 571             unpublish_all_services(u, 0);
 572             break;
 573
 574         case AVAHI_CLIENT_FAILURE:
 575             if (avahi_client_errno(c) == AVAHI_ERR_DISCONNECTED) {
 576                 int error;
 577                 unpublish_all_services(u, 1);
 578                 avahi_client_free(u->client);
 579
 580                 if (!(u->client = avahi_client_new(u->avahi_poll, AVAHI_CLIENT_NO_FAIL, client_callback, u, &error)))
 581                     pa_log("pa_avahi_client_new() failed: %s", avahi_strerror(error));
 582             }
 583
 584             break;
 585
 586         default: ;
 587     }
 588 }
 589
 590 int pa__init(pa_core *c, pa_module*m) {
 591     struct userdata *u;
 592     uint32_t port = PA_NATIVE_DEFAULT_PORT;
 593     pa_modargs *ma = NULL;
 594     char hn[256];
 595     int error;
 596
 597     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 598         pa_log("failed to parse module arguments.");
 599         goto fail;
 600     }
 601
 602     if (pa_modargs_get_value_u32(ma, "port", &port) < 0 || port == 0 || port >= 0xFFFF) {
 603         pa_log("invalid port specified.");
 604         goto fail;
 605     }
 606
 607     m->userdata = u = pa_xnew(struct userdata, 1);
 608     u->core = c;
 609     u->port = (uint16_t) port;
 610
 611     u->avahi_poll = pa_avahi_poll_new(c->mainloop);
 612
 613     u->services = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 614     u->sink_dynarray = pa_dynarray_new();
 615     u->source_dynarray = pa_dynarray_new();
 616     u->autoload_dynarray = pa_dynarray_new();
 617
 618     u->subscription = pa_subscription_new(c,
 619                                           PA_SUBSCRIPTION_MASK_SINK|
 620                                           PA_SUBSCRIPTION_MASK_SOURCE|
 621                                           PA_SUBSCRIPTION_MASK_AUTOLOAD, subscribe_callback, u);
 622
 623     u->main_entry_group = NULL;
 624
 625     u->service_name = pa_xstrdup(pa_get_host_name(hn, sizeof(hn)));
 626
 627     if (!(u->client = avahi_client_new(u->avahi_poll, AVAHI_CLIENT_NO_FAIL, client_callback, u, &error))) {
 628         pa_log("pa_avahi_client_new() failed: %s", avahi_strerror(error));
 629         goto fail;
 630     }
 631
 632     pa_modargs_free(ma);
 633
 634     return 0;
 635
 636 fail:
 637     pa__done(c, m);
 638
 639     if (ma)
 640         pa_modargs_free(ma);
 641
 642     return -1;
 643 }
 644
 645 static void service_free(void *p, void *userdata) {
 646     struct service *s = p;
 647     struct userdata *u = userdata;
 648
 649     assert(s);
 650     assert(u);
 651
 652     if (s->entry_group)
 653         avahi_entry_group_free(s->entry_group);
 654
 655     pa_xfree(s->service_name);
 656     pa_xfree(s->name);
 657     pa_xfree(s);
 658 }
 659
 660 void pa__done(pa_core *c, pa_module*m) {
 661     struct userdata*u;
 662     assert(c && m);
 663
 664     if (!(u = m->userdata))
 665         return;
 666
 667     if (u->services)
 668         pa_hashmap_free(u->services, service_free, u);
 669
 670     if (u->subscription)
 671         pa_subscription_free(u->subscription);
 672
 673     if (u->sink_dynarray)
 674         pa_dynarray_free(u->sink_dynarray, NULL, NULL);
 675     if (u->source_dynarray)
 676         pa_dynarray_free(u->source_dynarray, NULL, NULL);
 677     if (u->autoload_dynarray)
 678         pa_dynarray_free(u->autoload_dynarray, NULL, NULL);
 679
 680
 681     if (u->main_entry_group)
 682         avahi_entry_group_free(u->main_entry_group);
 683
 684     if (u->client)
 685         avahi_client_free(u->client);
 686
 687     if (u->avahi_poll)
 688         pa_avahi_poll_free(u->avahi_poll);
 689
 690     pa_xfree(u->service_name);
 691     pa_xfree(u);
 692 }
 693