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 <stdlib.h>
  30 #include <string.h>
  31 #include <unistd.h>
  32
  33 #include <avahi-client/client.h>
  34 #include <avahi-client/publish.h>
  35 #include <avahi-common/alternative.h>
  36 #include <avahi-common/error.h>
  37 #include <avahi-common/domain.h>
  38
  39 #include <pulse/xmalloc.h>
  40 #include <pulse/util.h>
  41
  42 #include <pulsecore/sink.h>
  43 #include <pulsecore/source.h>
  44 #include <pulsecore/native-common.h>
  45 #include <pulsecore/core-util.h>
  46 #include <pulsecore/log.h>
  47 #include <pulsecore/core-subscribe.h>
  48 #include <pulsecore/dynarray.h>
  49 #include <pulsecore/modargs.h>
  50 #include <pulsecore/avahi-wrap.h>
  51 #include <pulsecore/endianmacros.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 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 #define SERVICE_SUBTYPE_SINK_HARDWARE "_hardware._sub."SERVICE_TYPE_SINK
  65 #define SERVICE_SUBTYPE_SINK_VIRTUAL "_virtual._sub."SERVICE_TYPE_SINK
  66 #define SERVICE_SUBTYPE_SOURCE_HARDWARE "_hardware._sub."SERVICE_TYPE_SOURCE
  67 #define SERVICE_SUBTYPE_SOURCE_VIRTUAL "_virtual._sub."SERVICE_TYPE_SOURCE
  68 #define SERVICE_SUBTYPE_SOURCE_MONITOR "_monitor._sub."SERVICE_TYPE_SOURCE
  69 #define SERVICE_SUBTYPE_SOURCE_NON_MONITOR "_non-monitor._sub."SERVICE_TYPE_SOURCE
  70
  71 static const char* const valid_modargs[] = {
  72     "port",
  73     NULL
  74 };
  75
  76 enum service_subtype {
  77     SUBTYPE_HARDWARE,
  78     SUBTYPE_VIRTUAL,
  79     SUBTYPE_MONITOR
  80 };
  81
  82 struct service {
  83     struct userdata *userdata;
  84     AvahiEntryGroup *entry_group;
  85     char *service_name;
  86     pa_object *device;
  87     enum service_subtype subtype;
  88 };
  89
  90 struct userdata {
  91     pa_core *core;
  92     pa_module *module;
  93     AvahiPoll *avahi_poll;
  94     AvahiClient *client;
  95
  96     pa_hashmap *services;
  97     char *service_name;
  98
  99     AvahiEntryGroup *main_entry_group;
 100
 101     uint16_t port;
 102
 103     pa_hook_slot *sink_new_slot, *source_new_slot, *sink_unlink_slot, *source_unlink_slot, *sink_changed_slot, *source_changed_slot;
 104 };
 105
 106 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) {
 107     pa_assert(s);
 108     pa_assert(ret_ss);
 109     pa_assert(ret_description);
 110     pa_assert(ret_subtype);
 111
 112     if (pa_sink_isinstance(s->device)) {
 113         pa_sink *sink = PA_SINK(s->device);
 114
 115         *ret_ss = sink->sample_spec;
 116         *ret_map = sink->channel_map;
 117         *ret_name = sink->name;
 118         *ret_description = pa_strnull(pa_proplist_gets(sink->proplist, PA_PROP_DEVICE_DESCRIPTION));
 119         *ret_subtype = sink->flags & PA_SINK_HARDWARE ? SUBTYPE_HARDWARE : SUBTYPE_VIRTUAL;
 120
 121     } else if (pa_source_isinstance(s->device)) {
 122         pa_source *source = PA_SOURCE(s->device);
 123
 124         *ret_ss = source->sample_spec;
 125         *ret_map = source->channel_map;
 126         *ret_name = source->name;
 127         *ret_description = pa_strnull(pa_proplist_gets(source->proplist, PA_PROP_DEVICE_DESCRIPTION));
 128         *ret_subtype = source->monitor_of ? SUBTYPE_MONITOR : (source->flags & PA_SOURCE_HARDWARE ? SUBTYPE_HARDWARE : SUBTYPE_VIRTUAL);
 129
 130     } else
 131         pa_assert_not_reached();
 132 }
 133
 134 static AvahiStringList* txt_record_server_data(pa_core *c, AvahiStringList *l) {
 135     char s[128];
 136
 137     pa_assert(c);
 138
 139     l = avahi_string_list_add_pair(l, "server-version", PACKAGE_NAME" "PACKAGE_VERSION);
 140     l = avahi_string_list_add_pair(l, "user-name", pa_get_user_name(s, sizeof(s)));
 141     l = avahi_string_list_add_pair(l, "fqdn", pa_get_fqdn(s, sizeof(s)));
 142     l = avahi_string_list_add_printf(l, "cookie=0x%08x", c->cookie);
 143
 144     return l;
 145 }
 146
 147 static int publish_service(struct service *s);
 148
 149 static void service_entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
 150     struct service *s = userdata;
 151
 152     pa_assert(s);
 153
 154     switch (state) {
 155
 156         case AVAHI_ENTRY_GROUP_ESTABLISHED:
 157             pa_log_info("Successfully established service %s.", s->service_name);
 158             break;
 159
 160         case AVAHI_ENTRY_GROUP_COLLISION: {
 161             char *t;
 162
 163             t = avahi_alternative_service_name(s->service_name);
 164             pa_log_info("Name collision, renaming %s to %s.", s->service_name, t);
 165             pa_xfree(s->service_name);
 166             s->service_name = t;
 167
 168             publish_service(s);
 169             break;
 170         }
 171
 172         case AVAHI_ENTRY_GROUP_FAILURE: {
 173             pa_log("Failed to register service: %s", avahi_strerror(avahi_client_errno(avahi_entry_group_get_client(g))));
 174
 175             avahi_entry_group_free(g);
 176             s->entry_group = NULL;
 177
 178             break;
 179         }
 180
 181         case AVAHI_ENTRY_GROUP_UNCOMMITED:
 182         case AVAHI_ENTRY_GROUP_REGISTERING:
 183             ;
 184     }
 185 }
 186
 187 static void service_free(struct service *s);
 188
 189 static int publish_service(struct service *s) {
 190     int r = -1;
 191     AvahiStringList *txt = NULL;
 192     const char *description = NULL, *name = NULL;
 193     pa_sample_spec ss;
 194     pa_channel_map map;
 195     char cm[PA_CHANNEL_MAP_SNPRINT_MAX];
 196     enum service_subtype subtype;
 197
 198     const char * const subtype_text[] = {
 199         [SUBTYPE_HARDWARE] = "hardware",
 200         [SUBTYPE_VIRTUAL] = "virtual",
 201         [SUBTYPE_MONITOR] = "monitor"
 202     };
 203
 204     pa_assert(s);
 205
 206     if (!s->userdata->client || avahi_client_get_state(s->userdata->client) != AVAHI_CLIENT_S_RUNNING)
 207         return 0;
 208
 209     if (!s->entry_group) {
 210         if (!(s->entry_group = avahi_entry_group_new(s->userdata->client, service_entry_group_callback, s))) {
 211             pa_log("avahi_entry_group_new(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 212             goto finish;
 213         }
 214     } else
 215         avahi_entry_group_reset(s->entry_group);
 216
 217     txt = txt_record_server_data(s->userdata->core, txt);
 218
 219     get_service_data(s, &ss, &map, &name, &description, &subtype);
 220     txt = avahi_string_list_add_pair(txt, "device", name);
 221     txt = avahi_string_list_add_printf(txt, "rate=%u", ss.rate);
 222     txt = avahi_string_list_add_printf(txt, "channels=%u", ss.channels);
 223     txt = avahi_string_list_add_pair(txt, "format", pa_sample_format_to_string(ss.format));
 224     txt = avahi_string_list_add_pair(txt, "channel_map", pa_channel_map_snprint(cm, sizeof(cm), &map));
 225     txt = avahi_string_list_add_pair(txt, "subtype", subtype_text[subtype]);
 226
 227     if (avahi_entry_group_add_service_strlst(
 228                 s->entry_group,
 229                 AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 230                 0,
 231                 s->service_name,
 232                 pa_sink_isinstance(s->device) ? SERVICE_TYPE_SINK : SERVICE_TYPE_SOURCE,
 233                 NULL,
 234                 NULL,
 235                 s->userdata->port,
 236                 txt) < 0) {
 237
 238         pa_log("avahi_entry_group_add_service_strlst(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 239         goto finish;
 240     }
 241
 242     if (avahi_entry_group_add_service_subtype(
 243                 s->entry_group,
 244                 AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 245                 0,
 246                 s->service_name,
 247                 pa_sink_isinstance(s->device) ? SERVICE_TYPE_SINK : SERVICE_TYPE_SOURCE,
 248                 NULL,
 249                 pa_sink_isinstance(s->device) ? (subtype == SUBTYPE_HARDWARE ? SERVICE_SUBTYPE_SINK_HARDWARE : SERVICE_SUBTYPE_SINK_VIRTUAL) :
 250                 (subtype == SUBTYPE_HARDWARE ? SERVICE_SUBTYPE_SOURCE_HARDWARE : (subtype == SUBTYPE_VIRTUAL ? SERVICE_SUBTYPE_SOURCE_VIRTUAL : SERVICE_SUBTYPE_SOURCE_MONITOR))) < 0) {
 251
 252         pa_log("avahi_entry_group_add_service_subtype(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 253         goto finish;
 254     }
 255
 256     if (pa_source_isinstance(s->device) && subtype != SUBTYPE_MONITOR) {
 257         if (avahi_entry_group_add_service_subtype(
 258                     s->entry_group,
 259                     AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 260                     0,
 261                     s->service_name,
 262                     SERVICE_TYPE_SOURCE,
 263                     NULL,
 264                     SERVICE_SUBTYPE_SOURCE_NON_MONITOR) < 0) {
 265
 266             pa_log("avahi_entry_group_add_service_subtype(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 267             goto finish;
 268         }
 269     }
 270
 271     if (avahi_entry_group_commit(s->entry_group) < 0) {
 272         pa_log("avahi_entry_group_commit(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 273         goto finish;
 274     }
 275
 276     r = 0;
 277     pa_log_debug("Successfully created entry group for %s.", s->service_name);
 278
 279 finish:
 280
 281     /* Remove this service */
 282     if (r < 0)
 283         service_free(s);
 284
 285     avahi_string_list_free(txt);
 286
 287     return r;
 288 }
 289
 290 static struct service *get_service(struct userdata *u, pa_object *device) {
 291     struct service *s;
 292     char hn[64], un[64];
 293     const char *n;
 294
 295     pa_assert(u);
 296     pa_object_assert_ref(device);
 297
 298     if ((s = pa_hashmap_get(u->services, device)))
 299         return s;
 300
 301     s = pa_xnew(struct service, 1);
 302     s->userdata = u;
 303     s->entry_group = NULL;
 304     s->device = device;
 305
 306     if (pa_sink_isinstance(device)) {
 307         if (!(n = pa_proplist_gets(PA_SINK(device)->proplist, PA_PROP_DEVICE_DESCRIPTION)))
 308             n = PA_SINK(device)->name;
 309     } else {
 310         if (!(n = pa_proplist_gets(PA_SOURCE(device)->proplist, PA_PROP_DEVICE_DESCRIPTION)))
 311             n = PA_SOURCE(device)->name;
 312     }
 313
 314     s->service_name = pa_truncate_utf8(pa_sprintf_malloc("%s@%s: %s",
 315                                                          pa_get_user_name(un, sizeof(un)),
 316                                                          pa_get_host_name(hn, sizeof(hn)),
 317                                                          n),
 318                                        AVAHI_LABEL_MAX-1);
 319
 320     pa_hashmap_put(u->services, s->device, s);
 321
 322     return s;
 323 }
 324
 325 static void service_free(struct service *s) {
 326     pa_assert(s);
 327
 328     pa_hashmap_remove(s->userdata->services, s->device);
 329
 330     if (s->entry_group) {
 331         pa_log_debug("Removing entry group for %s.", s->service_name);
 332         avahi_entry_group_free(s->entry_group);
 333     }
 334
 335     pa_xfree(s->service_name);
 336     pa_xfree(s);
 337 }
 338
 339 static pa_bool_t shall_ignore(pa_object *o) {
 340     pa_object_assert_ref(o);
 341
 342     if (pa_sink_isinstance(o))
 343         return !!(PA_SINK(o)->flags & PA_SINK_NETWORK);
 344
 345     if (pa_source_isinstance(o))
 346         return PA_SOURCE(o)->monitor_of || (PA_SOURCE(o)->flags & PA_SOURCE_NETWORK);
 347
 348     pa_assert_not_reached();
 349 }
 350
 351 static pa_hook_result_t device_new_or_changed_cb(pa_core *c, pa_object *o, struct userdata *u) {
 352     pa_assert(c);
 353     pa_object_assert_ref(o);
 354
 355     if (!shall_ignore(o))
 356         publish_service(get_service(u, o));
 357
 358     return PA_HOOK_OK;
 359 }
 360
 361 static pa_hook_result_t device_unlink_cb(pa_core *c, pa_object *o, struct userdata *u) {
 362     struct service *s;
 363
 364     pa_assert(c);
 365     pa_object_assert_ref(o);
 366
 367     if ((s = pa_hashmap_get(u->services, o)))
 368         service_free(s);
 369
 370     return PA_HOOK_OK;
 371 }
 372
 373 static int publish_main_service(struct userdata *u);
 374
 375 static void main_entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
 376     struct userdata *u = userdata;
 377     pa_assert(u);
 378
 379     switch (state) {
 380
 381         case AVAHI_ENTRY_GROUP_ESTABLISHED:
 382             pa_log_info("Successfully established main service.");
 383             break;
 384
 385         case AVAHI_ENTRY_GROUP_COLLISION: {
 386             char *t;
 387
 388             t = avahi_alternative_service_name(u->service_name);
 389             pa_log_info("Name collision: renaming main service %s to %s.", u->service_name, t);
 390             pa_xfree(u->service_name);
 391             u->service_name = t;
 392
 393             publish_main_service(u);
 394             break;
 395         }
 396
 397         case AVAHI_ENTRY_GROUP_FAILURE: {
 398             pa_log("Failed to register main service: %s", avahi_strerror(avahi_client_errno(avahi_entry_group_get_client(g))));
 399
 400             avahi_entry_group_free(g);
 401             u->main_entry_group = NULL;
 402             break;
 403         }
 404
 405         case AVAHI_ENTRY_GROUP_UNCOMMITED:
 406         case AVAHI_ENTRY_GROUP_REGISTERING:
 407             break;
 408     }
 409 }
 410
 411 static int publish_main_service(struct userdata *u) {
 412     AvahiStringList *txt = NULL;
 413     int r = -1;
 414
 415     pa_assert(u);
 416
 417     if (!u->main_entry_group) {
 418         if (!(u->main_entry_group = avahi_entry_group_new(u->client, main_entry_group_callback, u))) {
 419             pa_log("avahi_entry_group_new() failed: %s", avahi_strerror(avahi_client_errno(u->client)));
 420             goto fail;
 421         }
 422     } else
 423         avahi_entry_group_reset(u->main_entry_group);
 424
 425     txt = txt_record_server_data(u->core, txt);
 426
 427     if (avahi_entry_group_add_service_strlst(
 428                 u->main_entry_group,
 429                 AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 430                 0,
 431                 u->service_name,
 432                 SERVICE_TYPE_SERVER,
 433                 NULL,
 434                 NULL,
 435                 u->port,
 436                 txt) < 0) {
 437
 438         pa_log("avahi_entry_group_add_service_strlst() failed: %s", avahi_strerror(avahi_client_errno(u->client)));
 439         goto fail;
 440     }
 441
 442     if (avahi_entry_group_commit(u->main_entry_group) < 0) {
 443         pa_log("avahi_entry_group_commit() failed: %s", avahi_strerror(avahi_client_errno(u->client)));
 444         goto fail;
 445     }
 446
 447     r = 0;
 448
 449 fail:
 450     avahi_string_list_free(txt);
 451
 452     return r;
 453 }
 454
 455 static int publish_all_services(struct userdata *u) {
 456     pa_sink *sink;
 457     pa_source *source;
 458     int r = -1;
 459     uint32_t idx;
 460
 461     pa_assert(u);
 462
 463     pa_log_debug("Publishing services in Zeroconf");
 464
 465     for (sink = PA_SINK(pa_idxset_first(u->core->sinks, &idx)); sink; sink = PA_SINK(pa_idxset_next(u->core->sinks, &idx)))
 466         if (!shall_ignore(PA_OBJECT(sink)))
 467             publish_service(get_service(u, PA_OBJECT(sink)));
 468
 469     for (source = PA_SOURCE(pa_idxset_first(u->core->sources, &idx)); source; source = PA_SOURCE(pa_idxset_next(u->core->sources, &idx)))
 470         if (!shall_ignore(PA_OBJECT(source)))
 471             publish_service(get_service(u, PA_OBJECT(source)));
 472
 473     if (publish_main_service(u) < 0)
 474         goto fail;
 475
 476     r = 0;
 477
 478 fail:
 479     return r;
 480 }
 481
 482 static void unpublish_all_services(struct userdata *u, pa_bool_t rem) {
 483     void *state = NULL;
 484     struct service *s;
 485
 486     pa_assert(u);
 487
 488     pa_log_debug("Unpublishing services in Zeroconf");
 489
 490     while ((s = pa_hashmap_iterate(u->services, &state, NULL))) {
 491         if (s->entry_group) {
 492             if (rem) {
 493                 pa_log_debug("Removing entry group for %s.", s->service_name);
 494                 avahi_entry_group_free(s->entry_group);
 495                 s->entry_group = NULL;
 496             } else {
 497                 avahi_entry_group_reset(s->entry_group);
 498                 pa_log_debug("Resetting entry group for %s.", s->service_name);
 499             }
 500         }
 501     }
 502
 503     if (u->main_entry_group) {
 504         if (rem) {
 505             pa_log_debug("Removing main entry group.");
 506             avahi_entry_group_free(u->main_entry_group);
 507             u->main_entry_group = NULL;
 508         } else {
 509             avahi_entry_group_reset(u->main_entry_group);
 510             pa_log_debug("Resetting main entry group.");
 511         }
 512     }
 513 }
 514
 515 static void client_callback(AvahiClient *c, AvahiClientState state, void *userdata) {
 516     struct userdata *u = userdata;
 517
 518     pa_assert(c);
 519     pa_assert(u);
 520
 521     u->client = c;
 522
 523     switch (state) {
 524         case AVAHI_CLIENT_S_RUNNING:
 525             publish_all_services(u);
 526             break;
 527
 528         case AVAHI_CLIENT_S_COLLISION:
 529             pa_log_debug("Host name collision");
 530             unpublish_all_services(u, FALSE);
 531             break;
 532
 533         case AVAHI_CLIENT_FAILURE:
 534             if (avahi_client_errno(c) == AVAHI_ERR_DISCONNECTED) {
 535                 int error;
 536
 537                 pa_log_debug("Avahi daemon disconnected.");
 538
 539                 unpublish_all_services(u, TRUE);
 540                 avahi_client_free(u->client);
 541
 542                 if (!(u->client = avahi_client_new(u->avahi_poll, AVAHI_CLIENT_NO_FAIL, client_callback, u, &error))) {
 543                     pa_log("avahi_client_new() failed: %s", avahi_strerror(error));
 544                     pa_module_unload_request(u->module);
 545                 }
 546             }
 547
 548             break;
 549
 550         default: ;
 551     }
 552 }
 553
 554 int pa__init(pa_module*m) {
 555
 556     struct userdata *u;
 557     uint32_t port = PA_NATIVE_DEFAULT_PORT;
 558     pa_modargs *ma = NULL;
 559     char hn[256], un[256];
 560     int error;
 561
 562     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 563         pa_log("Failed to parse module arguments.");
 564         goto fail;
 565     }
 566
 567     if (pa_modargs_get_value_u32(ma, "port", &port) < 0 || port <= 0 || port > 0xFFFF) {
 568         pa_log("Invalid port specified.");
 569         goto fail;
 570     }
 571
 572     m->userdata = u = pa_xnew(struct userdata, 1);
 573     u->core = m->core;
 574     u->module = m;
 575     u->port = (uint16_t) port;
 576
 577     u->avahi_poll = pa_avahi_poll_new(m->core->mainloop);
 578
 579     u->services = pa_hashmap_new(pa_idxset_trivial_hash_func, pa_idxset_trivial_compare_func);
 580
 581     u->sink_new_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_PUT], (pa_hook_cb_t) device_new_or_changed_cb, u);
 582     u->sink_changed_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_PROPLIST_CHANGED], (pa_hook_cb_t) device_new_or_changed_cb, u);
 583     u->sink_unlink_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_UNLINK], (pa_hook_cb_t) device_unlink_cb, u);
 584     u->source_new_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SOURCE_PUT], (pa_hook_cb_t) device_new_or_changed_cb, u);
 585     u->source_changed_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SOURCE_PROPLIST_CHANGED], (pa_hook_cb_t) device_new_or_changed_cb, u);
 586     u->source_unlink_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SOURCE_UNLINK], (pa_hook_cb_t) device_unlink_cb, u);
 587
 588     u->main_entry_group = NULL;
 589
 590     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);
 591
 592     if (!(u->client = avahi_client_new(u->avahi_poll, AVAHI_CLIENT_NO_FAIL, client_callback, u, &error))) {
 593         pa_log("avahi_client_new() failed: %s", avahi_strerror(error));
 594         goto fail;
 595     }
 596
 597     pa_modargs_free(ma);
 598
 599     return 0;
 600
 601 fail:
 602     pa__done(m);
 603
 604     if (ma)
 605         pa_modargs_free(ma);
 606
 607     return -1;
 608 }
 609
 610 void pa__done(pa_module*m) {
 611     struct userdata*u;
 612     pa_assert(m);
 613
 614     if (!(u = m->userdata))
 615         return;
 616
 617     if (u->services) {
 618         struct service *s;
 619
 620         while ((s = pa_hashmap_get_first(u->services)))
 621             service_free(s);
 622
 623         pa_hashmap_free(u->services, NULL, NULL);
 624     }
 625
 626     if (u->sink_new_slot)
 627         pa_hook_slot_free(u->sink_new_slot);
 628     if (u->source_new_slot)
 629         pa_hook_slot_free(u->source_new_slot);
 630     if (u->sink_changed_slot)
 631         pa_hook_slot_free(u->sink_changed_slot);
 632     if (u->source_changed_slot)
 633         pa_hook_slot_free(u->source_changed_slot);
 634     if (u->sink_unlink_slot)
 635         pa_hook_slot_free(u->sink_unlink_slot);
 636     if (u->source_unlink_slot)
 637         pa_hook_slot_free(u->source_unlink_slot);
 638
 639     if (u->main_entry_group)
 640         avahi_entry_group_free(u->main_entry_group);
 641
 642     if (u->client)
 643         avahi_client_free(u->client);
 644
 645     if (u->avahi_poll)
 646         pa_avahi_poll_free(u->avahi_poll);
 647
 648     pa_xfree(u->service_name);
 649     pa_xfree(u);
 650 }