code.delx.au - pulseaudio/blob - src/modules/module-zeroconf-discover.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/lookup.h>
  35 #include <avahi-common/alternative.h>
  36 #include <avahi-common/error.h>
  37 #include <avahi-common/domain.h>
  38 #include <avahi-common/malloc.h>
  39
  40 #include <pulse/xmalloc.h>
  41 #include <pulse/util.h>
  42
  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/hashmap.h>
  50 #include <pulsecore/modargs.h>
  51 #include <pulsecore/namereg.h>
  52 #include <pulsecore/avahi-wrap.h>
  53
  54 #include "module-zeroconf-discover-symdef.h"
  55
  56 PA_MODULE_AUTHOR("Lennart Poettering")
  57 PA_MODULE_DESCRIPTION("mDNS/DNS-SD Service Discovery")
  58 PA_MODULE_VERSION(PACKAGE_VERSION)
  59
  60 #define SERVICE_TYPE_SINK "_pulse-sink._tcp"
  61 #define SERVICE_TYPE_SOURCE "_non-monitor._sub._pulse-source._tcp"
  62
  63 static const char* const valid_modargs[] = {
  64     NULL
  65 };
  66
  67 struct tunnel {
  68     AvahiIfIndex interface;
  69     AvahiProtocol protocol;
  70     char *name, *type, *domain;
  71     uint32_t module_index;
  72 };
  73
  74 struct userdata {
  75     pa_core *core;
  76     pa_module *module;
  77     AvahiPoll *avahi_poll;
  78     AvahiClient *client;
  79     AvahiServiceBrowser *source_browser, *sink_browser;
  80
  81     pa_hashmap *tunnels;
  82 };
  83
  84 static unsigned tunnel_hash(const void *p) {
  85     const struct tunnel *t = p;
  86
  87     return
  88         (unsigned) t->interface +
  89         (unsigned) t->protocol +
  90         pa_idxset_string_hash_func(t->name) +
  91         pa_idxset_string_hash_func(t->type) +
  92         pa_idxset_string_hash_func(t->domain);
  93 }
  94
  95 static int tunnel_compare(const void *a, const void *b) {
  96     const struct tunnel *ta = a, *tb = b;
  97     int r;
  98
  99     if (ta->interface != tb->interface)
 100         return 1;
 101     if (ta->protocol != tb->protocol)
 102         return 1;
 103     if ((r = strcmp(ta->name, tb->name)))
 104         return r;
 105     if ((r = strcmp(ta->type, tb->type)))
 106         return r;
 107     if ((r = strcmp(ta->domain, tb->domain)))
 108         return r;
 109
 110     return 0;
 111 }
 112
 113 static struct tunnel *tunnel_new(
 114         AvahiIfIndex interface, AvahiProtocol protocol,
 115         const char *name, const char *type, const char *domain) {
 116
 117     struct tunnel *t;
 118     t = pa_xnew(struct tunnel, 1);
 119     t->interface = interface;
 120     t->protocol = protocol;
 121     t->name = pa_xstrdup(name);
 122     t->type = pa_xstrdup(type);
 123     t->domain = pa_xstrdup(domain);
 124     t->module_index = PA_IDXSET_INVALID;
 125     return t;
 126 }
 127
 128 static void tunnel_free(struct tunnel *t) {
 129     pa_assert(t);
 130     pa_xfree(t->name);
 131     pa_xfree(t->type);
 132     pa_xfree(t->domain);
 133     pa_xfree(t);
 134 }
 135
 136 static void resolver_cb(
 137         AvahiServiceResolver *r,
 138         AvahiIfIndex interface, AvahiProtocol protocol,
 139         AvahiResolverEvent event,
 140         const char *name, const char *type, const char *domain,
 141         const char *host_name, const AvahiAddress *a, uint16_t port,
 142         AvahiStringList *txt,
 143         AvahiLookupResultFlags flags,
 144         void *userdata) {
 145
 146     struct userdata *u = userdata;
 147     struct tunnel *tnl;
 148
 149     pa_assert(u);
 150
 151     tnl = tunnel_new(interface, protocol, name, type, domain);
 152
 153     if (event != AVAHI_RESOLVER_FOUND)
 154         pa_log("Resolving of '%s' failed: %s", name, avahi_strerror(avahi_client_errno(u->client)));
 155     else {
 156         char *device = NULL, *dname, *module_name, *args;
 157         const char *t;
 158         char at[AVAHI_ADDRESS_STR_MAX], cmt[PA_CHANNEL_MAP_SNPRINT_MAX];
 159         pa_sample_spec ss;
 160         pa_channel_map cm;
 161         AvahiStringList *l;
 162         pa_bool_t channel_map_set = FALSE;
 163         pa_module *m;
 164
 165         ss = u->core->default_sample_spec;
 166         pa_channel_map_init_auto(&cm, ss.channels, PA_CHANNEL_MAP_DEFAULT);
 167
 168         for (l = txt; l; l = l->next) {
 169             char *key, *value;
 170             pa_assert_se(avahi_string_list_get_pair(l, &key, &value, NULL) == 0);
 171
 172             if (strcmp(key, "device") == 0) {
 173                 pa_xfree(device);
 174                 device = value;
 175                 value = NULL;
 176             } else if (strcmp(key, "rate") == 0)
 177                 ss.rate = atoi(value);
 178             else if (strcmp(key, "channels") == 0)
 179                 ss.channels = atoi(value);
 180             else if (strcmp(key, "format") == 0)
 181                 ss.format = pa_parse_sample_format(value);
 182             else if (strcmp(key, "channel_map") == 0) {
 183                 pa_channel_map_parse(&cm, value);
 184                 channel_map_set = TRUE;
 185             }
 186
 187             avahi_free(key);
 188             avahi_free(value);
 189         }
 190
 191         if (!channel_map_set && cm.channels != ss.channels)
 192             pa_channel_map_init_auto(&cm, ss.channels, PA_CHANNEL_MAP_DEFAULT);
 193
 194         if (!pa_sample_spec_valid(&ss)) {
 195             pa_log("Service '%s' contains an invalid sample specification.", name);
 196             avahi_free(device);
 197             goto finish;
 198         }
 199
 200         if (!pa_channel_map_valid(&cm) || cm.channels != ss.channels) {
 201             pa_log("Service '%s' contains an invalid channel map.", name);
 202             avahi_free(device);
 203             goto finish;
 204         }
 205
 206         if (device)
 207             dname = pa_sprintf_malloc("tunnel.%s.%s", host_name, device);
 208         else
 209             dname = pa_sprintf_malloc("tunnel.%s", host_name);
 210
 211         if (!pa_namereg_is_valid_name(dname)) {
 212             pa_log("Cannot construct valid device name from credentials of service '%s'.", dname);
 213             avahi_free(device);
 214             pa_xfree(dname);
 215             goto finish;
 216         }
 217
 218         t = strstr(type, "sink") ? "sink" : "source";
 219
 220         module_name = pa_sprintf_malloc("module-tunnel-%s", t);
 221         args = pa_sprintf_malloc("server=[%s]:%u "
 222                                  "%s=%s "
 223                                  "format=%s "
 224                                  "channels=%u "
 225                                  "rate=%u "
 226                                  "%s_name=%s "
 227                                  "channel_map=%s",
 228                                  avahi_address_snprint(at, sizeof(at), a), port,
 229                                  t, device,
 230                                  pa_sample_format_to_string(ss.format),
 231                                  ss.channels,
 232                                  ss.rate,
 233                                  t, dname,
 234                                  pa_channel_map_snprint(cmt, sizeof(cmt), &cm));
 235
 236         pa_log_debug("Loading module-tunnel-%s with arguments '%s'", module_name, args);
 237
 238         if ((m = pa_module_load(u->core, module_name, args))) {
 239             tnl->module_index = m->index;
 240             pa_hashmap_put(u->tunnels, tnl, tnl);
 241             tnl = NULL;
 242         }
 243
 244         pa_xfree(module_name);
 245         pa_xfree(dname);
 246         pa_xfree(args);
 247         avahi_free(device);
 248     }
 249
 250 finish:
 251
 252     avahi_service_resolver_free(r);
 253
 254     if (tnl)
 255         tunnel_free(tnl);
 256 }
 257
 258 static void browser_cb(
 259         AvahiServiceBrowser *b,
 260         AvahiIfIndex interface, AvahiProtocol protocol,
 261         AvahiBrowserEvent event,
 262         const char *name, const char *type, const char *domain,
 263         AvahiLookupResultFlags flags,
 264         void *userdata) {
 265
 266     struct userdata *u = userdata;
 267     struct tunnel *t;
 268
 269     pa_assert(u);
 270
 271     if (flags & AVAHI_LOOKUP_RESULT_LOCAL)
 272         return;
 273
 274     t = tunnel_new(interface, protocol, name, type, domain);
 275
 276     if (event == AVAHI_BROWSER_NEW) {
 277
 278         if (!pa_hashmap_get(u->tunnels, t))
 279             if (!(avahi_service_resolver_new(u->client, interface, protocol, name, type, domain, AVAHI_PROTO_UNSPEC, 0, resolver_cb, u)))
 280                 pa_log("avahi_service_resolver_new() failed: %s", avahi_strerror(avahi_client_errno(u->client)));
 281
 282         /* We ignore the returned resolver object here, since the we don't
 283          * need to attach any special data to it, and we can still destory
 284          * it from the callback */
 285
 286     } else if (event == AVAHI_BROWSER_REMOVE) {
 287         struct tunnel *t2;
 288
 289         if ((t2 = pa_hashmap_get(u->tunnels, t))) {
 290             pa_module_unload_by_index(u->core, t2->module_index);
 291             pa_hashmap_remove(u->tunnels, t2);
 292             tunnel_free(t2);
 293         }
 294     }
 295
 296     tunnel_free(t);
 297 }
 298
 299 static void client_callback(AvahiClient *c, AvahiClientState state, void *userdata) {
 300     struct userdata *u = userdata;
 301
 302     pa_assert(c);
 303     pa_assert(u);
 304
 305     u->client = c;
 306
 307     switch (state) {
 308         case AVAHI_CLIENT_S_REGISTERING:
 309         case AVAHI_CLIENT_S_RUNNING:
 310         case AVAHI_CLIENT_S_COLLISION:
 311
 312             if (!u->sink_browser) {
 313
 314                 if (!(u->sink_browser = avahi_service_browser_new(
 315                               c,
 316                               AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 317                               SERVICE_TYPE_SINK,
 318                               NULL,
 319                               0,
 320                               browser_cb, u))) {
 321
 322                     pa_log("avahi_service_browser_new() failed: %s", avahi_strerror(avahi_client_errno(c)));
 323                     pa_module_unload_request(u->module);
 324                 }
 325             }
 326
 327             if (!u->source_browser) {
 328
 329                 if (!(u->source_browser = avahi_service_browser_new(
 330                               c,
 331                               AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
 332                               SERVICE_TYPE_SOURCE,
 333                               NULL,
 334                               0,
 335                               browser_cb, u))) {
 336
 337                     pa_log("avahi_service_browser_new() failed: %s", avahi_strerror(avahi_client_errno(c)));
 338                     pa_module_unload_request(u->module);
 339                 }
 340             }
 341
 342             break;
 343
 344         case AVAHI_CLIENT_FAILURE:
 345             if (avahi_client_errno(c) == AVAHI_ERR_DISCONNECTED) {
 346                 int error;
 347
 348                 pa_log_debug("Avahi daemon disconnected.");
 349
 350                 if (!(u->client = avahi_client_new(u->avahi_poll, AVAHI_CLIENT_NO_FAIL, client_callback, u, &error))) {
 351                     pa_log("avahi_client_new() failed: %s", avahi_strerror(error));
 352                     pa_module_unload_request(u->module);
 353                 }
 354             }
 355
 356             /* Fall through */
 357
 358         case AVAHI_CLIENT_CONNECTING:
 359
 360             if (u->sink_browser) {
 361                 avahi_service_browser_free(u->sink_browser);
 362                 u->sink_browser = NULL;
 363             }
 364
 365             if (u->source_browser) {
 366                 avahi_service_browser_free(u->source_browser);
 367                 u->source_browser = NULL;
 368             }
 369
 370             break;
 371
 372         default: ;
 373     }
 374 }
 375
 376 int pa__init(pa_module*m) {
 377
 378     struct userdata *u;
 379     pa_modargs *ma = NULL;
 380     int error;
 381
 382     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 383         pa_log("Failed to parse module arguments.");
 384         goto fail;
 385     }
 386
 387     m->userdata = u = pa_xnew(struct userdata, 1);
 388     u->core = m->core;
 389     u->module = m;
 390     u->sink_browser = u->source_browser = NULL;
 391
 392     u->tunnels = pa_hashmap_new(tunnel_hash, tunnel_compare);
 393
 394     u->avahi_poll = pa_avahi_poll_new(m->core->mainloop);
 395
 396     if (!(u->client = avahi_client_new(u->avahi_poll, AVAHI_CLIENT_NO_FAIL, client_callback, u, &error))) {
 397         pa_log("pa_avahi_client_new() failed: %s", avahi_strerror(error));
 398         goto fail;
 399     }
 400
 401     pa_modargs_free(ma);
 402
 403     return 0;
 404
 405 fail:
 406     pa__done(m);
 407
 408     if (ma)
 409         pa_modargs_free(ma);
 410
 411     return -1;
 412 }
 413
 414 void pa__done(pa_module*m) {
 415     struct userdata*u;
 416     pa_assert(m);
 417
 418     if (!(u = m->userdata))
 419         return;
 420
 421     if (u->client)
 422         avahi_client_free(u->client);
 423
 424     if (u->avahi_poll)
 425         pa_avahi_poll_free(u->avahi_poll);
 426
 427     if (u->tunnels) {
 428         struct tunnel *t;
 429
 430         while ((t = pa_hashmap_steal_first(u->tunnels))) {
 431             pa_module_unload_by_index(u->core, t->module_index);
 432             tunnel_free(t);
 433         }
 434
 435         pa_hashmap_free(u->tunnels, NULL, NULL);
 436     }
 437
 438     pa_xfree(u);
 439 }