diff options
Diffstat (limited to 'src/modules/module-zeroconf-discover.c')
| -rw-r--r-- | src/modules/module-zeroconf-discover.c | 446 |
1 files changed, 446 insertions, 0 deletions
diff --git a/src/modules/module-zeroconf-discover.c b/src/modules/module-zeroconf-discover.c new file mode 100644 index 0000000..612e2ed --- /dev/null +++ b/src/modules/module-zeroconf-discover.c @@ -0,0 +1,446 @@ +/*** + This file is part of PulseAudio. + + Copyright 2004-2006 Lennart Poettering + + PulseAudio is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + PulseAudio is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>. +***/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include <avahi-client/client.h> +#include <avahi-client/lookup.h> +#include <avahi-common/alternative.h> +#include <avahi-common/error.h> +#include <avahi-common/domain.h> +#include <avahi-common/malloc.h> + +#include <pulse/xmalloc.h> + +#include <pulsecore/core-util.h> +#include <pulsecore/log.h> +#include <pulsecore/hashmap.h> +#include <pulsecore/modargs.h> +#include <pulsecore/namereg.h> +#include <pulsecore/avahi-wrap.h> + +PA_MODULE_AUTHOR("Lennart Poettering"); +PA_MODULE_DESCRIPTION("mDNS/DNS-SD Service Discovery"); +PA_MODULE_VERSION(PACKAGE_VERSION); +PA_MODULE_LOAD_ONCE(true); + +#define SERVICE_TYPE_SINK "_pulse-sink._tcp" +#define SERVICE_TYPE_SOURCE "_non-monitor._sub._pulse-source._tcp" + +static const char* const valid_modargs[] = { + NULL +}; + +struct tunnel { + AvahiIfIndex interface; + AvahiProtocol protocol; + char *name, *type, *domain; + uint32_t module_index; +}; + +struct userdata { + pa_core *core; + pa_module *module; + AvahiPoll *avahi_poll; + AvahiClient *client; + AvahiServiceBrowser *source_browser, *sink_browser; + + pa_hashmap *tunnels; +}; + +static unsigned tunnel_hash(const void *p) { + const struct tunnel *t = p; + + return + (unsigned) t->interface + + (unsigned) t->protocol + + pa_idxset_string_hash_func(t->name) + + pa_idxset_string_hash_func(t->type) + + pa_idxset_string_hash_func(t->domain); +} + +static int tunnel_compare(const void *a, const void *b) { + const struct tunnel *ta = a, *tb = b; + int r; + + if (ta->interface != tb->interface) + return 1; + if (ta->protocol != tb->protocol) + return 1; + if ((r = strcmp(ta->name, tb->name))) + return r; + if ((r = strcmp(ta->type, tb->type))) + return r; + if ((r = strcmp(ta->domain, tb->domain))) + return r; + + return 0; +} + +static struct tunnel *tunnel_new( + AvahiIfIndex interface, AvahiProtocol protocol, + const char *name, const char *type, const char *domain) { + + struct tunnel *t; + t = pa_xnew(struct tunnel, 1); + t->interface = interface; + t->protocol = protocol; + t->name = pa_xstrdup(name); + t->type = pa_xstrdup(type); + t->domain = pa_xstrdup(domain); + t->module_index = PA_IDXSET_INVALID; + return t; +} + +static void tunnel_free(struct tunnel *t) { + pa_assert(t); + pa_xfree(t->name); + pa_xfree(t->type); + pa_xfree(t->domain); + pa_xfree(t); +} + +static void resolver_cb( + AvahiServiceResolver *r, + AvahiIfIndex interface, AvahiProtocol protocol, + AvahiResolverEvent event, + const char *name, const char *type, const char *domain, + const char *host_name, const AvahiAddress *a, uint16_t port, + AvahiStringList *txt, + AvahiLookupResultFlags flags, + void *userdata) { + + struct userdata *u = userdata; + struct tunnel *tnl; + + pa_assert(u); + + tnl = tunnel_new(interface, protocol, name, type, domain); + + if (event != AVAHI_RESOLVER_FOUND) + pa_log("Resolving of '%s' failed: %s", name, avahi_strerror(avahi_client_errno(u->client))); + else { + char *device = NULL, *dname, *module_name, *args; + const char *t; + char *if_suffix = NULL; + char at[AVAHI_ADDRESS_STR_MAX], cmt[PA_CHANNEL_MAP_SNPRINT_MAX]; + char *properties = NULL; + pa_sample_spec ss; + pa_channel_map cm; + AvahiStringList *l; + bool channel_map_set = false; + pa_module *m; + + ss = u->core->default_sample_spec; + cm = u->core->default_channel_map; + + for (l = txt; l; l = l->next) { + char *key, *value; + pa_assert_se(avahi_string_list_get_pair(l, &key, &value, NULL) == 0); + + if (pa_streq(key, "device")) { + pa_xfree(device); + device = value; + value = NULL; + } else if (pa_streq(key, "rate")) + ss.rate = (uint32_t) atoi(value); + else if (pa_streq(key, "channels")) + ss.channels = (uint8_t) atoi(value); + else if (pa_streq(key, "format")) + ss.format = pa_parse_sample_format(value); + else if (pa_streq(key, "icon-name")) { + pa_xfree(properties); + properties = pa_sprintf_malloc("device.icon_name=%s", value); + } else if (pa_streq(key, "channel_map")) { + pa_channel_map_parse(&cm, value); + channel_map_set = true; + } + + avahi_free(key); + avahi_free(value); + } + + if (!channel_map_set && cm.channels != ss.channels) + pa_channel_map_init_extend(&cm, ss.channels, PA_CHANNEL_MAP_DEFAULT); + + if (!pa_sample_spec_valid(&ss)) { + pa_log("Service '%s' contains an invalid sample specification.", name); + avahi_free(device); + pa_xfree(properties); + goto finish; + } + + if (!pa_channel_map_valid(&cm) || cm.channels != ss.channels) { + pa_log("Service '%s' contains an invalid channel map.", name); + avahi_free(device); + pa_xfree(properties); + goto finish; + } + + if (device) + dname = pa_sprintf_malloc("tunnel.%s.%s", host_name, device); + else + dname = pa_sprintf_malloc("tunnel.%s", host_name); + + if (!pa_namereg_is_valid_name(dname)) { + pa_log("Cannot construct valid device name from credentials of service '%s'.", dname); + avahi_free(device); + pa_xfree(dname); + pa_xfree(properties); + goto finish; + } + + t = strstr(type, "sink") ? "sink" : "source"; + if (a->proto == AVAHI_PROTO_INET6 && + a->data.ipv6.address[0] == 0xfe && + (a->data.ipv6.address[1] & 0xc0) == 0x80) + if_suffix = pa_sprintf_malloc("%%%d", interface); + + module_name = pa_sprintf_malloc("module-tunnel-%s", t); + args = pa_sprintf_malloc("server=[%s%s]:%u " + "%s=%s " + "format=%s " + "channels=%u " + "rate=%u " + "%s_properties=%s " + "%s_name=%s " + "channel_map=%s", + avahi_address_snprint(at, sizeof(at), a), + if_suffix ? if_suffix : "", port, + t, device, + pa_sample_format_to_string(ss.format), + ss.channels, + ss.rate, + t, properties ? properties : "", + t, dname, + pa_channel_map_snprint(cmt, sizeof(cmt), &cm)); + + pa_log_debug("Loading %s with arguments '%s'", module_name, args); + + if (pa_module_load(&m, u->core, module_name, args) >= 0) { + tnl->module_index = m->index; + pa_hashmap_put(u->tunnels, tnl, tnl); + tnl = NULL; + } + + pa_xfree(module_name); + pa_xfree(dname); + pa_xfree(args); + pa_xfree(if_suffix); + pa_xfree(properties); + avahi_free(device); + } + +finish: + + avahi_service_resolver_free(r); + + if (tnl) + tunnel_free(tnl); +} + +static void browser_cb( + AvahiServiceBrowser *b, + AvahiIfIndex interface, AvahiProtocol protocol, + AvahiBrowserEvent event, + const char *name, const char *type, const char *domain, + AvahiLookupResultFlags flags, + void *userdata) { + + struct userdata *u = userdata; + struct tunnel *t; + + pa_assert(u); + + if (flags & AVAHI_LOOKUP_RESULT_LOCAL) + return; + + t = tunnel_new(interface, protocol, name, type, domain); + + if (event == AVAHI_BROWSER_NEW) { + + if (!pa_hashmap_get(u->tunnels, t)) + if (!(avahi_service_resolver_new(u->client, interface, protocol, name, type, domain, AVAHI_PROTO_UNSPEC, 0, resolver_cb, u))) + pa_log("avahi_service_resolver_new() failed: %s", avahi_strerror(avahi_client_errno(u->client))); + + /* We ignore the returned resolver object here, since the we don't + * need to attach any special data to it, and we can still destroy + * it from the callback */ + + } else if (event == AVAHI_BROWSER_REMOVE) { + struct tunnel *t2; + + if ((t2 = pa_hashmap_get(u->tunnels, t))) { + pa_module_unload_request_by_index(u->core, t2->module_index, true); + pa_hashmap_remove(u->tunnels, t2); + tunnel_free(t2); + } + } + + tunnel_free(t); +} + +static void client_callback(AvahiClient *c, AvahiClientState state, void *userdata) { + struct userdata *u = userdata; + + pa_assert(c); + pa_assert(u); + + u->client = c; + + switch (state) { + case AVAHI_CLIENT_S_REGISTERING: + case AVAHI_CLIENT_S_RUNNING: + case AVAHI_CLIENT_S_COLLISION: + + if (!u->sink_browser) { + + if (!(u->sink_browser = avahi_service_browser_new( + c, + AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, + SERVICE_TYPE_SINK, + NULL, + 0, + browser_cb, u))) { + + pa_log("avahi_service_browser_new() failed: %s", avahi_strerror(avahi_client_errno(c))); + pa_module_unload_request(u->module, true); + } + } + + if (!u->source_browser) { + + if (!(u->source_browser = avahi_service_browser_new( + c, + AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, + SERVICE_TYPE_SOURCE, + NULL, + 0, + browser_cb, u))) { + + pa_log("avahi_service_browser_new() failed: %s", avahi_strerror(avahi_client_errno(c))); + pa_module_unload_request(u->module, true); + } + } + + break; + + case AVAHI_CLIENT_FAILURE: + if (avahi_client_errno(c) == AVAHI_ERR_DISCONNECTED) { + int error; + + pa_log_debug("Avahi daemon disconnected."); + + if (!(u->client = avahi_client_new(u->avahi_poll, AVAHI_CLIENT_NO_FAIL, client_callback, u, &error))) { + pa_log("avahi_client_new() failed: %s", avahi_strerror(error)); + pa_module_unload_request(u->module, true); + } + } + + /* Fall through */ + + case AVAHI_CLIENT_CONNECTING: + + if (u->sink_browser) { + avahi_service_browser_free(u->sink_browser); + u->sink_browser = NULL; + } + + if (u->source_browser) { + avahi_service_browser_free(u->source_browser); + u->source_browser = NULL; + } + + break; + + default: ; + } +} + +int pa__init(pa_module*m) { + + struct userdata *u; + pa_modargs *ma = NULL; + int error; + + if (!(ma = pa_modargs_new(m->argument, valid_modargs))) { + pa_log("Failed to parse module arguments."); + goto fail; + } + + m->userdata = u = pa_xnew(struct userdata, 1); + u->core = m->core; + u->module = m; + u->sink_browser = u->source_browser = NULL; + + u->tunnels = pa_hashmap_new(tunnel_hash, tunnel_compare); + + u->avahi_poll = pa_avahi_poll_new(m->core->mainloop); + + if (!(u->client = avahi_client_new(u->avahi_poll, AVAHI_CLIENT_NO_FAIL, client_callback, u, &error))) { + pa_log("pa_avahi_client_new() failed: %s", avahi_strerror(error)); + goto fail; + } + + pa_modargs_free(ma); + + return 0; + +fail: + pa__done(m); + + if (ma) + pa_modargs_free(ma); + + return -1; +} + +void pa__done(pa_module*m) { + struct userdata*u; + pa_assert(m); + + if (!(u = m->userdata)) + return; + + if (u->client) + avahi_client_free(u->client); + + if (u->avahi_poll) + pa_avahi_poll_free(u->avahi_poll); + + if (u->tunnels) { + struct tunnel *t; + + while ((t = pa_hashmap_steal_first(u->tunnels))) { + pa_module_unload_request_by_index(u->core, t->module_index, true); + tunnel_free(t); + } + + pa_hashmap_free(u->tunnels); + } + + pa_xfree(u); +} |