mirror of
https://github.com/badaix/snapcast.git
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283 lines
8.3 KiB
C++
283 lines
8.3 KiB
C++
/***
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This file is part of avahi.
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avahi is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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avahi is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with avahi; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <unistd.h>
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#include <avahi-client/client.h>
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#include <avahi-client/publish.h>
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#include <avahi-common/alternative.h>
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#include <avahi-common/simple-watch.h>
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#include <avahi-common/malloc.h>
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#include <avahi-common/error.h>
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#include <avahi-common/timeval.h>
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#include "publishAvahi.h"
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static AvahiEntryGroup *group;
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static AvahiSimplePoll *simple_poll;
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static char* name;
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PublishAvahi::PublishAvahi(const std::string& serviceName) : client(NULL), serviceName_(serviceName)
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{
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group = NULL;
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simple_poll = NULL;
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name = avahi_strdup(serviceName_.c_str());
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}
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void PublishAvahi::publish(const std::vector<AvahiService>& services)
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{
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this->services = services;
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AvahiClient *client = NULL;
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int error;
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/* Allocate main loop object */
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if (!(simple_poll = avahi_simple_poll_new()))
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{
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fprintf(stderr, "Failed to create simple poll object.\n");
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}
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/* Allocate a new client */
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client = avahi_client_new(avahi_simple_poll_get(simple_poll), AVAHI_CLIENT_IGNORE_USER_CONFIG, client_callback, this, &error);
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/* Check wether creating the client object succeeded */
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if (!client)
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{
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fprintf(stderr, "Failed to create client: %s\n", avahi_strerror(error));
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}
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active_ = true;
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pollThread_ = std::thread(&PublishAvahi::worker, this);
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}
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void PublishAvahi::worker()
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{
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while (active_ && (avahi_simple_poll_iterate(simple_poll, 100) == 0));
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}
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PublishAvahi::~PublishAvahi()
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{
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active_ = false;
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pollThread_.join();
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if (client)
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avahi_client_free(client);
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if (simple_poll)
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avahi_simple_poll_free(simple_poll);
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avahi_free(name);
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}
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void PublishAvahi::entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, AVAHI_GCC_UNUSED void *userdata) {
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assert(g == group || group == NULL);
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group = g;
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/* Called whenever the entry group state changes */
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switch (state) {
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case AVAHI_ENTRY_GROUP_ESTABLISHED :
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/* The entry group has been established successfully */
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fprintf(stderr, "Service '%s' successfully established.\n", name);
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break;
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case AVAHI_ENTRY_GROUP_COLLISION : {
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char *n;
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/* A service name collision with a remote service
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* happened. Let's pick a new name */
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n = avahi_alternative_service_name(name);
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avahi_free(name);
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name = n;
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fprintf(stderr, "Service name collision, renaming service to '%s'\n", name);
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/* And recreate the services */
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static_cast<PublishAvahi*>(userdata)->create_services(avahi_entry_group_get_client(g));
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break;
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}
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case AVAHI_ENTRY_GROUP_FAILURE :
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fprintf(stderr, "Entry group failure: %s\n", avahi_strerror(avahi_client_errno(avahi_entry_group_get_client(g))));
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/* Some kind of failure happened while we were registering our services */
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avahi_simple_poll_quit(simple_poll);
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break;
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case AVAHI_ENTRY_GROUP_UNCOMMITED:
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case AVAHI_ENTRY_GROUP_REGISTERING:
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;
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}
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}
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void PublishAvahi::create_services(AvahiClient *c) {
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char *n, r[128];
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int ret;
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assert(c);
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/* If this is the first time we're called, let's create a new
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* entry group if necessary */
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if (!group)
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{
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if (!(group = avahi_entry_group_new(c, entry_group_callback, NULL))) {
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fprintf(stderr, "avahi_entry_group_new() failed: %s\n", avahi_strerror(avahi_client_errno(c)));
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goto fail;
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}
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}
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/* If the group is empty (either because it was just created, or
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* because it was reset previously, add our entries. */
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if (avahi_entry_group_is_empty(group)) {
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fprintf(stderr, "Adding service '%s'\n", name);
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/* Create some random TXT data */
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snprintf(r, sizeof(r), "random=%i", rand());
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/* We will now add two services and one subtype to the entry
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* group. The two services have the same name, but differ in
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* the service type (IPP vs. BSD LPR). Only services with the
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* same name should be put in the same entry group. */
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/* Add the service for IPP */
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/* if ((ret = avahi_entry_group_add_service(group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AVAHI_PUBLISH_UNIQUE, name, "_ipp._tcp", NULL, NULL, 651, "test=blah", r, NULL)) < 0) {
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if (ret == AVAHI_ERR_COLLISION)
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goto collision;
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fprintf(stderr, "Failed to add _ipp._tcp service: %s\n", avahi_strerror(ret));
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goto fail;
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}
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*/
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/* Add the same service for BSD LPR */
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for (size_t n=0; n<services.size(); ++n)
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{
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if ((ret = avahi_entry_group_add_service(group, AVAHI_IF_UNSPEC, services[n].proto_, AvahiPublishFlags(0), name, services[n].name_.c_str(), NULL, NULL, services[n].port_, NULL)) < 0)
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{
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if (ret == AVAHI_ERR_COLLISION)
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goto collision;
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fprintf(stderr, "Failed to add _snapcast._tcp service: %s\n", avahi_strerror(ret));
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goto fail;
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}
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}
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/* Add an additional (hypothetic) subtype */
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/* if ((ret = avahi_entry_group_add_service_subtype(group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AvahiPublishFlags(0), name, "_printer._tcp", NULL, "_magic._sub._printer._tcp") < 0)) {
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fprintf(stderr, "Failed to add subtype _magic._sub._printer._tcp: %s\n", avahi_strerror(ret));
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goto fail;
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}
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*/
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/* Tell the server to register the service */
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if ((ret = avahi_entry_group_commit(group)) < 0) {
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fprintf(stderr, "Failed to commit entry group: %s\n", avahi_strerror(ret));
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goto fail;
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}
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}
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return;
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collision:
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/* A service name collision with a local service happened. Let's
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* pick a new name */
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n = avahi_alternative_service_name(name);
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avahi_free(name);
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name = n;
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fprintf(stderr, "Service name collision, renaming service to '%s'\n", name);
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avahi_entry_group_reset(group);
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create_services(c);
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return;
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fail:
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avahi_simple_poll_quit(simple_poll);
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}
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void PublishAvahi::client_callback(AvahiClient *c, AvahiClientState state, AVAHI_GCC_UNUSED void * userdata) {
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assert(c);
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/* Called whenever the client or server state changes */
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switch (state) {
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case AVAHI_CLIENT_S_RUNNING:
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/* The server has startup successfully and registered its host
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* name on the network, so it's time to create our services */
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static_cast<PublishAvahi*>(userdata)->create_services(c);
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break;
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case AVAHI_CLIENT_FAILURE:
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fprintf(stderr, "Client failure: %s\n", avahi_strerror(avahi_client_errno(c)));
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avahi_simple_poll_quit(simple_poll);
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break;
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case AVAHI_CLIENT_S_COLLISION:
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/* Let's drop our registered services. When the server is back
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* in AVAHI_SERVER_RUNNING state we will register them
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* again with the new host name. */
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case AVAHI_CLIENT_S_REGISTERING:
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/* The server records are now being established. This
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* might be caused by a host name change. We need to wait
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* for our own records to register until the host name is
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* properly esatblished. */
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if (group)
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avahi_entry_group_reset(group);
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break;
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case AVAHI_CLIENT_CONNECTING:
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;
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}
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}
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/*
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int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[])
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{
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PublishAvahi publishAvahi("SnapCast");
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std::vector<AvahiService> services;
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services.push_back(AvahiService("_snapcast._tcp", 123));
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publishAvahi.publish(services);
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while (true)
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usleep(100000);
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return 0;
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}
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*/
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