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 2.1 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 <unistd.h>
  29
  30 #include <avahi-client/client.h>
  31 #include <avahi-client/publish.h>
  32 #include <avahi-common/alternative.h>
  33 #include <avahi-common/error.h>
  34 #include <avahi-common/domain.h>
  35
  36 #include <pulse/xmalloc.h>
  37 #include <pulse/util.h>
  38 #include <pulse/thread-mainloop.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/dynarray.h>
  47 #include <pulsecore/modargs.h>
  48 #include <pulsecore/avahi-wrap.h>
  49 #include <pulsecore/protocol-native.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
  58 #define SERVICE_TYPE_SINK "_pulse-sink._tcp"
  59 #define SERVICE_TYPE_SOURCE "_pulse-source._tcp"
  60 #define SERVICE_TYPE_SERVER "_pulse-server._tcp"
  61 #define SERVICE_SUBTYPE_SINK_HARDWARE "_hardware._sub."SERVICE_TYPE_SINK
  62 #define SERVICE_SUBTYPE_SINK_VIRTUAL "_virtual._sub."SERVICE_TYPE_SINK
  63 #define SERVICE_SUBTYPE_SOURCE_HARDWARE "_hardware._sub."SERVICE_TYPE_SOURCE
  64 #define SERVICE_SUBTYPE_SOURCE_VIRTUAL "_virtual._sub."SERVICE_TYPE_SOURCE
  65 #define SERVICE_SUBTYPE_SOURCE_MONITOR "_monitor._sub."SERVICE_TYPE_SOURCE
  66 #define SERVICE_SUBTYPE_SOURCE_NON_MONITOR "_non-monitor._sub."SERVICE_TYPE_SOURCE
  67
  68 /*
  69  * Note: Because the core avahi-client calls result in synchronous D-Bus
  70  * communication, calling any of those functions in the PA mainloop context
  71  * could lead to the mainloop being blocked for long periods.
  72  *
  73  * To avoid this, we create a threaded-mainloop for Avahi calls, and push all
  74  * D-Bus communication into that thread. The thumb-rule for the split is:
  75  *
  76  * 1. If access to PA data structures is needed, use the PA mainloop context
  77  *
  78  * 2. If a (blocking) avahi-client call is needed, use the Avahi mainloop
  79  *
  80  * We do have message queue to pass messages from the Avahi mainloop to the PA
  81  * mainloop.
  82  */
  83
  84 static const char* const valid_modargs[] = {
  85     NULL
  86 };
  87
  88 struct avahi_msg {
  89     pa_msgobject parent;
  90 };
  91
  92 typedef struct avahi_msg avahi_msg;
  93 PA_DEFINE_PRIVATE_CLASS(avahi_msg, pa_msgobject);
  94
  95 enum {
  96     AVAHI_MESSAGE_PUBLISH_ALL,
  97     AVAHI_MESSAGE_SHUTDOWN_START,
  98     AVAHI_MESSAGE_SHUTDOWN_COMPLETE,
  99 };
 100
 101 enum service_subtype {
 102     SUBTYPE_HARDWARE,
 103     SUBTYPE_VIRTUAL,
 104     SUBTYPE_MONITOR
 105 };
 106
 107 struct service {
 108     void *key;
 109
 110     struct userdata *userdata;
 111     AvahiEntryGroup *entry_group;
 112     char *service_name;
 113     const char *service_type;
 114     enum service_subtype subtype;
 115
 116     char *name;
 117     bool is_sink;
 118     pa_sample_spec ss;
 119     pa_channel_map cm;
 120     pa_proplist *proplist;
 121 };
 122
 123 struct userdata {
 124     pa_thread_mq thread_mq;
 125     pa_rtpoll *rtpoll;
 126     avahi_msg *msg;
 127
 128     pa_core *core;
 129     pa_module *module;
 130     pa_mainloop_api *api;
 131     pa_threaded_mainloop *mainloop;
 132
 133     AvahiPoll *avahi_poll;
 134     AvahiClient *client;
 135
 136     pa_hashmap *services; /* protect with mainloop lock */
 137     char *service_name;
 138
 139     AvahiEntryGroup *main_entry_group;
 140
 141     pa_hook_slot *sink_new_slot, *source_new_slot, *sink_unlink_slot, *source_unlink_slot, *sink_changed_slot, *source_changed_slot;
 142
 143     pa_native_protocol *native;
 144 };
 145
 146 /* Runs in PA mainloop context */
 147 static void get_service_data(struct service *s, pa_object *device) {
 148     pa_assert(s);
 149
 150     if (pa_sink_isinstance(device)) {
 151         pa_sink *sink = PA_SINK(device);
 152
 153         s->is_sink = true;
 154         s->service_type = SERVICE_TYPE_SINK;
 155         s->ss = sink->sample_spec;
 156         s->cm = sink->channel_map;
 157         s->name = pa_xstrdup(sink->name);
 158         s->proplist = pa_proplist_copy(sink->proplist);
 159         s->subtype = sink->flags & PA_SINK_HARDWARE ? SUBTYPE_HARDWARE : SUBTYPE_VIRTUAL;
 160
 161     } else if (pa_source_isinstance(device)) {
 162         pa_source *source = PA_SOURCE(device);
 163
 164         s->is_sink = false;
 165         s->service_type = SERVICE_TYPE_SOURCE;
 166         s->ss = source->sample_spec;
 167         s->cm = source->channel_map;
 168         s->name = pa_xstrdup(source->name);
 169         s->proplist = pa_proplist_copy(source->proplist);
 170         s->subtype = source->monitor_of ? SUBTYPE_MONITOR : (source->flags & PA_SOURCE_HARDWARE ? SUBTYPE_HARDWARE : SUBTYPE_VIRTUAL);
 171
 172     } else
 173         pa_assert_not_reached();
 174 }
 175
 176 /* Can be used in either PA or Avahi mainloop context since the bits of u->core
 177  * that we access don't change after startup. */
 178 static AvahiStringList* txt_record_server_data(pa_core *c, AvahiStringList *l) {
 179     char s[128];
 180     char *t;
 181
 182     pa_assert(c);
 183
 184     l = avahi_string_list_add_pair(l, "server-version", PACKAGE_NAME" "PACKAGE_VERSION);
 185
 186     t = pa_get_user_name_malloc();
 187     l = avahi_string_list_add_pair(l, "user-name", t);
 188     pa_xfree(t);
 189
 190     t = pa_machine_id();
 191     l = avahi_string_list_add_pair(l, "machine-id", t);
 192     pa_xfree(t);
 193
 194     t = pa_uname_string();
 195     l = avahi_string_list_add_pair(l, "uname", t);
 196     pa_xfree(t);
 197
 198     l = avahi_string_list_add_pair(l, "fqdn", pa_get_fqdn(s, sizeof(s)));
 199     l = avahi_string_list_add_printf(l, "cookie=0x%08x", c->cookie);
 200
 201     return l;
 202 }
 203
 204 static void publish_service(pa_mainloop_api *api, void *service);
 205
 206 /* Runs in Avahi mainloop context */
 207 static void service_entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
 208     struct service *s = userdata;
 209
 210     pa_assert(s);
 211
 212     switch (state) {
 213
 214         case AVAHI_ENTRY_GROUP_ESTABLISHED:
 215             pa_log_info("Successfully established service %s.", s->service_name);
 216             break;
 217
 218         case AVAHI_ENTRY_GROUP_COLLISION: {
 219             char *t;
 220
 221             t = avahi_alternative_service_name(s->service_name);
 222             pa_log_info("Name collision, renaming %s to %s.", s->service_name, t);
 223             pa_xfree(s->service_name);
 224             s->service_name = t;
 225
 226             publish_service(NULL, s);
 227             break;
 228         }
 229
 230         case AVAHI_ENTRY_GROUP_FAILURE: {
 231             pa_log("Failed to register service: %s", avahi_strerror(avahi_client_errno(avahi_entry_group_get_client(g))));
 232
 233             avahi_entry_group_free(g);
 234             s->entry_group = NULL;
 235
 236             break;
 237         }
 238
 239         case AVAHI_ENTRY_GROUP_UNCOMMITED:
 240         case AVAHI_ENTRY_GROUP_REGISTERING:
 241             ;
 242     }
 243 }
 244
 245 static void service_free(struct service *s);
 246
 247 /* Can run in either context */
 248 static uint16_t compute_port(struct userdata *u) {
 249     pa_strlist *i;
 250
 251     pa_assert(u);
 252
 253     for (i = pa_native_protocol_servers(u->native); i; i = pa_strlist_next(i)) {
 254         pa_parsed_address a;
 255
 256         if (pa_parse_address(pa_strlist_data(i), &a) >= 0 &&
 257             (a.type == PA_PARSED_ADDRESS_TCP4 ||
 258              a.type == PA_PARSED_ADDRESS_TCP6 ||
 259              a.type == PA_PARSED_ADDRESS_TCP_AUTO) &&
 260             a.port > 0) {
 261
 262             pa_xfree(a.path_or_host);
 263             return a.port;
 264         }
 265
 266         pa_xfree(a.path_or_host);
 267     }
 268
 269     return PA_NATIVE_DEFAULT_PORT;
 270 }
 271
 272 /* Runs in Avahi mainloop context */
 273 static void publish_service(pa_mainloop_api *api PA_GCC_UNUSED, void *service) {
 274     struct service *s = (struct service *) service;
 275     int r = -1;
 276     AvahiStringList *txt = NULL;
 277     char cm[PA_CHANNEL_MAP_SNPRINT_MAX];
 278     const char *t;
 279
 280     const char * const subtype_text[] = {
 281         [SUBTYPE_HARDWARE] = "hardware",
 282         [SUBTYPE_VIRTUAL] = "virtual",
 283         [SUBTYPE_MONITOR] = "monitor"
 284     };
 285
 286     pa_assert(s);
 287
 288     if (!s->userdata->client || avahi_client_get_state(s->userdata->client) != AVAHI_CLIENT_S_RUNNING)
 289         return;
 290
 291     if (!s->entry_group) {
 292         if (!(s->entry_group = avahi_entry_group_new(s->userdata->client, service_entry_group_callback, s))) {
 293             pa_log("avahi_entry_group_new(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 294             goto finish;
 295         }
 296     } else
 297         avahi_entry_group_reset(s->entry_group);
 298
 299     txt = txt_record_server_data(s->userdata->core, txt);
 300
 301     txt = avahi_string_list_add_pair(txt, "device", s->name);
 302     txt = avahi_string_list_add_printf(txt, "rate=%u", s->ss.rate);
 303     txt = avahi_string_list_add_printf(txt, "channels=%u", s->ss.channels);
 304     txt = avahi_string_list_add_pair(txt, "format", pa_sample_format_to_string(s->ss.format));
 305     txt = avahi_string_list_add_pair(txt, "channel_map", pa_channel_map_snprint(cm, sizeof(cm), &s->cm));
 306     txt = avahi_string_list_add_pair(txt, "subtype", subtype_text[s->subtype]);
 307
 308     if ((t = pa_proplist_gets(s->proplist, PA_PROP_DEVICE_DESCRIPTION)))
 309         txt = avahi_string_list_add_pair(txt, "description", t);
 310     if ((t = pa_proplist_gets(s->proplist, PA_PROP_DEVICE_ICON_NAME)))
 311         txt = avahi_string_list_add_pair(txt, "icon-name", t);
 312     if ((t = pa_proplist_gets(s->proplist, PA_PROP_DEVICE_VENDOR_NAME)))
 313         txt = avahi_string_list_add_pair(txt, "vendor-name", t);
 314     if ((t = pa_proplist_gets(s->proplist, PA_PROP_DEVICE_PRODUCT_NAME)))
 315         txt = avahi_string_list_add_pair(txt, "product-name", t);
 316     if ((t = pa_proplist_gets(s->proplist, PA_PROP_DEVICE_CLASS)))
 317         txt = avahi_string_list_add_pair(txt, "class", t);
 318     if ((t = pa_proplist_gets(s->proplist, PA_PROP_DEVICE_FORM_FACTOR)))
 319         txt = avahi_string_list_add_pair(txt, "form-factor", t);
 320
 321     if (avahi_entry_group_add_service_strlst(
 322                 s->entry_group,
 323                 AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 324                 0,
 325                 s->service_name,
 326                 s->service_type,
 327                 NULL,
 328                 NULL,
 329                 compute_port(s->userdata),
 330                 txt) < 0) {
 331
 332         pa_log("avahi_entry_group_add_service_strlst(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 333         goto finish;
 334     }
 335
 336     if (avahi_entry_group_add_service_subtype(
 337                 s->entry_group,
 338                 AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 339                 0,
 340                 s->service_name,
 341                 s->service_type,
 342                 NULL,
 343                 s->is_sink ? (s->subtype == SUBTYPE_HARDWARE ? SERVICE_SUBTYPE_SINK_HARDWARE : SERVICE_SUBTYPE_SINK_VIRTUAL) :
 344                 (s->subtype == SUBTYPE_HARDWARE ? SERVICE_SUBTYPE_SOURCE_HARDWARE : (s->subtype == SUBTYPE_VIRTUAL ? SERVICE_SUBTYPE_SOURCE_VIRTUAL : SERVICE_SUBTYPE_SOURCE_MONITOR))) < 0) {
 345
 346         pa_log("avahi_entry_group_add_service_subtype(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 347         goto finish;
 348     }
 349
 350     if (!s->is_sink && s->subtype != SUBTYPE_MONITOR) {
 351         if (avahi_entry_group_add_service_subtype(
 352                     s->entry_group,
 353                     AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 354                     0,
 355                     s->service_name,
 356                     SERVICE_TYPE_SOURCE,
 357                     NULL,
 358                     SERVICE_SUBTYPE_SOURCE_NON_MONITOR) < 0) {
 359
 360             pa_log("avahi_entry_group_add_service_subtype(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 361             goto finish;
 362         }
 363     }
 364
 365     if (avahi_entry_group_commit(s->entry_group) < 0) {
 366         pa_log("avahi_entry_group_commit(): %s", avahi_strerror(avahi_client_errno(s->userdata->client)));
 367         goto finish;
 368     }
 369
 370     r = 0;
 371     pa_log_debug("Successfully created entry group for %s.", s->service_name);
 372
 373 finish:
 374
 375     /* Remove this service */
 376     if (r < 0) {
 377         pa_hashmap_remove(s->userdata->services, s->key);
 378         service_free(s);
 379     }
 380
 381     avahi_string_list_free(txt);
 382 }
 383
 384 /* Runs in PA mainloop context */
 385 static struct service *get_service(struct userdata *u, pa_object *device) {
 386     struct service *s;
 387     char *hn, *un;
 388     const char *n;
 389
 390     pa_assert(u);
 391     pa_object_assert_ref(device);
 392
 393     pa_threaded_mainloop_lock(u->mainloop);
 394
 395     if ((s = pa_hashmap_get(u->services, device)))
 396         goto out;
 397
 398     s = pa_xnew(struct service, 1);
 399     s->key = device;
 400     s->userdata = u;
 401     s->entry_group = NULL;
 402
 403     get_service_data(s, device);
 404
 405     if (!(n = pa_proplist_gets(s->proplist, PA_PROP_DEVICE_DESCRIPTION)))
 406         n = s->name;
 407
 408     hn = pa_get_host_name_malloc();
 409     un = pa_get_user_name_malloc();
 410
 411     s->service_name = pa_truncate_utf8(pa_sprintf_malloc("%s@%s: %s", un, hn, n), AVAHI_LABEL_MAX-1);
 412
 413     pa_xfree(un);
 414     pa_xfree(hn);
 415
 416     pa_hashmap_put(u->services, device, s);
 417
 418 out:
 419     pa_threaded_mainloop_unlock(u->mainloop);
 420
 421     return s;
 422 }
 423
 424 /* Run from Avahi mainloop context */
 425 static void service_free(struct service *s) {
 426     pa_assert(s);
 427
 428     if (s->entry_group) {
 429         pa_log_debug("Removing entry group for %s.", s->service_name);
 430         avahi_entry_group_free(s->entry_group);
 431     }
 432
 433     pa_xfree(s->service_name);
 434
 435     pa_xfree(s->name);
 436     pa_proplist_free(s->proplist);
 437
 438     pa_xfree(s);
 439 }
 440
 441 /* Runs in PA mainloop context */
 442 static bool shall_ignore(pa_object *o) {
 443     pa_object_assert_ref(o);
 444
 445     if (pa_sink_isinstance(o))
 446         return !!(PA_SINK(o)->flags & PA_SINK_NETWORK);
 447
 448     if (pa_source_isinstance(o))
 449         return PA_SOURCE(o)->monitor_of || (PA_SOURCE(o)->flags & PA_SOURCE_NETWORK);
 450
 451     pa_assert_not_reached();
 452 }
 453
 454 /* Runs in PA mainloop context */
 455 static pa_hook_result_t device_new_or_changed_cb(pa_core *c, pa_object *o, struct userdata *u) {
 456     pa_assert(c);
 457     pa_object_assert_ref(o);
 458
 459     if (!shall_ignore(o)) {
 460         pa_threaded_mainloop_lock(u->mainloop);
 461         pa_mainloop_api_once(u->api, publish_service, get_service(u, o));
 462         pa_threaded_mainloop_unlock(u->mainloop);
 463     }
 464
 465     return PA_HOOK_OK;
 466 }
 467
 468 /* Runs in PA mainloop context */
 469 static pa_hook_result_t device_unlink_cb(pa_core *c, pa_object *o, struct userdata *u) {
 470     struct service *s;
 471
 472     pa_assert(c);
 473     pa_object_assert_ref(o);
 474
 475     pa_threaded_mainloop_lock(u->mainloop);
 476
 477     if ((s = pa_hashmap_remove(u->services, o)))
 478         service_free(s);
 479
 480     pa_threaded_mainloop_unlock(u->mainloop);
 481
 482     return PA_HOOK_OK;
 483 }
 484
 485 static int publish_main_service(struct userdata *u);
 486
 487 /* Runs in Avahi mainloop context */
 488 static void main_entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
 489     struct userdata *u = userdata;
 490     pa_assert(u);
 491
 492     switch (state) {
 493
 494         case AVAHI_ENTRY_GROUP_ESTABLISHED:
 495             pa_log_info("Successfully established main service.");
 496             break;
 497
 498         case AVAHI_ENTRY_GROUP_COLLISION: {
 499             char *t;
 500
 501             t = avahi_alternative_service_name(u->service_name);
 502             pa_log_info("Name collision: renaming main service %s to %s.", u->service_name, t);
 503             pa_xfree(u->service_name);
 504             u->service_name = t;
 505
 506             publish_main_service(u);
 507             break;
 508         }
 509
 510         case AVAHI_ENTRY_GROUP_FAILURE: {
 511             pa_log("Failed to register main service: %s", avahi_strerror(avahi_client_errno(avahi_entry_group_get_client(g))));
 512
 513             avahi_entry_group_free(g);
 514             u->main_entry_group = NULL;
 515             break;
 516         }
 517
 518         case AVAHI_ENTRY_GROUP_UNCOMMITED:
 519         case AVAHI_ENTRY_GROUP_REGISTERING:
 520             break;
 521     }
 522 }
 523
 524 /* Runs in Avahi mainloop context */
 525 static int publish_main_service(struct userdata *u) {
 526     AvahiStringList *txt = NULL;
 527     int r = -1;
 528
 529     pa_assert(u);
 530
 531     if (!u->main_entry_group) {
 532         if (!(u->main_entry_group = avahi_entry_group_new(u->client, main_entry_group_callback, u))) {
 533             pa_log("avahi_entry_group_new() failed: %s", avahi_strerror(avahi_client_errno(u->client)));
 534             goto fail;
 535         }
 536     } else
 537         avahi_entry_group_reset(u->main_entry_group);
 538
 539     txt = txt_record_server_data(u->core, txt);
 540
 541     if (avahi_entry_group_add_service_strlst(
 542                 u->main_entry_group,
 543                 AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 544                 0,
 545                 u->service_name,
 546                 SERVICE_TYPE_SERVER,
 547                 NULL,
 548                 NULL,
 549                 compute_port(u),
 550                 txt) < 0) {
 551
 552         pa_log("avahi_entry_group_add_service_strlst() failed: %s", avahi_strerror(avahi_client_errno(u->client)));
 553         goto fail;
 554     }
 555
 556     if (avahi_entry_group_commit(u->main_entry_group) < 0) {
 557         pa_log("avahi_entry_group_commit() failed: %s", avahi_strerror(avahi_client_errno(u->client)));
 558         goto fail;
 559     }
 560
 561     r = 0;
 562
 563 fail:
 564     avahi_string_list_free(txt);
 565
 566     return r;
 567 }
 568
 569 /* Runs in PA mainloop context */
 570 static int publish_all_services(struct userdata *u) {
 571     pa_sink *sink;
 572     pa_source *source;
 573     int r = -1;
 574     uint32_t idx;
 575
 576     pa_assert(u);
 577
 578     pa_log_debug("Publishing services in Zeroconf");
 579
 580     for (sink = PA_SINK(pa_idxset_first(u->core->sinks, &idx)); sink; sink = PA_SINK(pa_idxset_next(u->core->sinks, &idx)))
 581         if (!shall_ignore(PA_OBJECT(sink))) {
 582             pa_threaded_mainloop_lock(u->mainloop);
 583             pa_mainloop_api_once(u->api, publish_service, get_service(u, PA_OBJECT(sink)));
 584             pa_threaded_mainloop_unlock(u->mainloop);
 585         }
 586
 587     for (source = PA_SOURCE(pa_idxset_first(u->core->sources, &idx)); source; source = PA_SOURCE(pa_idxset_next(u->core->sources, &idx)))
 588         if (!shall_ignore(PA_OBJECT(source))) {
 589             pa_threaded_mainloop_lock(u->mainloop);
 590             pa_mainloop_api_once(u->api, publish_service, get_service(u, PA_OBJECT(source)));
 591             pa_threaded_mainloop_unlock(u->mainloop);
 592         }
 593
 594     if (publish_main_service(u) < 0)
 595         goto fail;
 596
 597     r = 0;
 598
 599 fail:
 600     return r;
 601 }
 602
 603 /* Runs in Avahi mainloop context */
 604 static void unpublish_all_services(struct userdata *u, bool rem) {
 605     void *state = NULL;
 606     struct service *s;
 607
 608     pa_assert(u);
 609
 610     pa_log_debug("Unpublishing services in Zeroconf");
 611
 612     while ((s = pa_hashmap_iterate(u->services, &state, NULL))) {
 613         if (s->entry_group) {
 614             if (rem) {
 615                 pa_log_debug("Removing entry group for %s.", s->service_name);
 616                 avahi_entry_group_free(s->entry_group);
 617                 s->entry_group = NULL;
 618             } else {
 619                 avahi_entry_group_reset(s->entry_group);
 620                 pa_log_debug("Resetting entry group for %s.", s->service_name);
 621             }
 622         }
 623     }
 624
 625     if (u->main_entry_group) {
 626         if (rem) {
 627             pa_log_debug("Removing main entry group.");
 628             avahi_entry_group_free(u->main_entry_group);
 629             u->main_entry_group = NULL;
 630         } else {
 631             avahi_entry_group_reset(u->main_entry_group);
 632             pa_log_debug("Resetting main entry group.");
 633         }
 634     }
 635 }
 636
 637 /* Runs in PA mainloop context */
 638 static int avahi_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
 639     struct userdata *u = (struct userdata *) data;
 640
 641     switch (code) {
 642         case AVAHI_MESSAGE_PUBLISH_ALL:
 643             publish_all_services(u);
 644             break;
 645
 646         case AVAHI_MESSAGE_SHUTDOWN_START:
 647             pa_module_unload(u->core, u->module, true);
 648             break;
 649
 650         case AVAHI_MESSAGE_SHUTDOWN_COMPLETE:
 651             /* pa__done() is waiting for this */
 652             break;
 653
 654         default:
 655             pa_assert_not_reached();
 656     }
 657
 658     return 0;
 659 }
 660
 661 /* Runs in Avahi mainloop context */
 662 static void client_callback(AvahiClient *c, AvahiClientState state, void *userdata) {
 663     struct userdata *u = userdata;
 664
 665     pa_assert(c);
 666     pa_assert(u);
 667
 668     u->client = c;
 669
 670     switch (state) {
 671         case AVAHI_CLIENT_S_RUNNING:
 672             /* Collect all sinks/sources, and publish them */
 673             pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->msg), AVAHI_MESSAGE_PUBLISH_ALL, u, 0, NULL, NULL);
 674             break;
 675
 676         case AVAHI_CLIENT_S_COLLISION:
 677             pa_log_debug("Host name collision");
 678             unpublish_all_services(u, false);
 679             break;
 680
 681         case AVAHI_CLIENT_FAILURE:
 682             if (avahi_client_errno(c) == AVAHI_ERR_DISCONNECTED) {
 683                 int error;
 684
 685                 pa_log_debug("Avahi daemon disconnected.");
 686
 687                 unpublish_all_services(u, true);
 688                 avahi_client_free(u->client);
 689
 690                 if (!(u->client = avahi_client_new(u->avahi_poll, AVAHI_CLIENT_NO_FAIL, client_callback, u, &error))) {
 691                     pa_log("avahi_client_new() failed: %s", avahi_strerror(error));
 692                     pa_module_unload_request(u->module, true);
 693                 }
 694             }
 695
 696             break;
 697
 698         default: ;
 699     }
 700 }
 701
 702 /* Runs in Avahi mainloop context */
 703 static void create_client(pa_mainloop_api *api PA_GCC_UNUSED, void *userdata) {
 704     struct userdata *u = (struct userdata *) userdata;
 705     int error;
 706
 707     pa_thread_mq_install(&u->thread_mq);
 708
 709     if (!(u->client = avahi_client_new(u->avahi_poll, AVAHI_CLIENT_NO_FAIL, client_callback, u, &error))) {
 710         pa_log("avahi_client_new() failed: %s", avahi_strerror(error));
 711         goto fail;
 712     }
 713
 714     pa_log_debug("Started Avahi threaded mainloop");
 715
 716     return;
 717
 718 fail:
 719     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->msg), AVAHI_MESSAGE_SHUTDOWN_START, u, 0, NULL, NULL);
 720 }
 721
 722 int pa__init(pa_module*m) {
 723
 724     struct userdata *u;
 725     pa_modargs *ma = NULL;
 726     char *hn, *un;
 727
 728     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 729         pa_log("Failed to parse module arguments.");
 730         goto fail;
 731     }
 732
 733     m->userdata = u = pa_xnew(struct userdata, 1);
 734     u->core = m->core;
 735     u->module = m;
 736     u->native = pa_native_protocol_get(u->core);
 737
 738     u->rtpoll = pa_rtpoll_new();
 739     u->mainloop = pa_threaded_mainloop_new();
 740     u->api = pa_threaded_mainloop_get_api(u->mainloop);
 741
 742     pa_thread_mq_init(&u->thread_mq, u->core->mainloop, u->rtpoll);
 743     u->msg = pa_msgobject_new(avahi_msg);
 744     u->msg->parent.process_msg = avahi_process_msg;
 745
 746     u->avahi_poll = pa_avahi_poll_new(u->api);
 747
 748     u->services = pa_hashmap_new_full(pa_idxset_trivial_hash_func, pa_idxset_trivial_compare_func, NULL, (pa_free_cb_t) service_free);
 749
 750     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);
 751     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);
 752     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);
 753     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);
 754     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);
 755     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);
 756
 757     u->main_entry_group = NULL;
 758
 759     un = pa_get_user_name_malloc();
 760     hn = pa_get_host_name_malloc();
 761     u->service_name = pa_truncate_utf8(pa_sprintf_malloc("%s@%s", un, hn), AVAHI_LABEL_MAX-1);
 762     pa_xfree(un);
 763     pa_xfree(hn);
 764
 765     pa_threaded_mainloop_set_name(u->mainloop, "avahi-ml");
 766     pa_threaded_mainloop_start(u->mainloop);
 767
 768     pa_threaded_mainloop_lock(u->mainloop);
 769     pa_mainloop_api_once(u->api, create_client, u);
 770     pa_threaded_mainloop_unlock(u->mainloop);
 771
 772     pa_modargs_free(ma);
 773
 774     return 0;
 775
 776 fail:
 777     pa__done(m);
 778
 779     if (ma)
 780         pa_modargs_free(ma);
 781
 782     return -1;
 783 }
 784
 785 /* Runs in Avahi mainloop context */
 786 static void client_free(pa_mainloop_api *api PA_GCC_UNUSED, void *userdata) {
 787     struct userdata *u = (struct userdata *) userdata;
 788
 789     pa_hashmap_free(u->services);
 790
 791     if (u->main_entry_group)
 792         avahi_entry_group_free(u->main_entry_group);
 793
 794     if (u->client)
 795         avahi_client_free(u->client);
 796
 797     if (u->avahi_poll)
 798         pa_avahi_poll_free(u->avahi_poll);
 799
 800     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->msg), AVAHI_MESSAGE_SHUTDOWN_COMPLETE, NULL, 0, NULL, NULL);
 801 }
 802
 803 void pa__done(pa_module*m) {
 804     struct userdata*u;
 805     pa_assert(m);
 806
 807     if (!(u = m->userdata))
 808         return;
 809
 810     pa_mainloop_api_once(u->api, client_free, u);
 811     pa_asyncmsgq_wait_for(u->thread_mq.outq, AVAHI_MESSAGE_SHUTDOWN_COMPLETE);
 812
 813     pa_threaded_mainloop_stop(u->mainloop);
 814     pa_threaded_mainloop_free(u->mainloop);
 815
 816     pa_thread_mq_done(&u->thread_mq);
 817     pa_rtpoll_free(u->rtpoll);
 818
 819     if (u->sink_new_slot)
 820         pa_hook_slot_free(u->sink_new_slot);
 821     if (u->source_new_slot)
 822         pa_hook_slot_free(u->source_new_slot);
 823     if (u->sink_changed_slot)
 824         pa_hook_slot_free(u->sink_changed_slot);
 825     if (u->source_changed_slot)
 826         pa_hook_slot_free(u->source_changed_slot);
 827     if (u->sink_unlink_slot)
 828         pa_hook_slot_free(u->sink_unlink_slot);
 829     if (u->source_unlink_slot)
 830         pa_hook_slot_free(u->source_unlink_slot);
 831
 832     if (u->native)
 833         pa_native_protocol_unref(u->native);
 834
 835     pa_xfree(u->msg);
 836     pa_xfree(u->service_name);
 837     pa_xfree(u);
 838 }