283 lines
7.3 KiB
C++
283 lines
7.3 KiB
C++
/*
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* Copyright 2003-2017 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "ZeroconfAvahi.hxx"
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#include "AvahiPoll.hxx"
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#include "ZeroconfInternal.hxx"
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#include "Listen.hxx"
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#include "system/FatalError.hxx"
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#include "util/Domain.hxx"
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#include "Log.hxx"
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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/domain.h>
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#include <avahi-common/malloc.h>
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#include <avahi-common/error.h>
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#include <dbus/dbus.h>
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static constexpr Domain avahi_domain("avahi");
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static char *avahi_name;
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static MyAvahiPoll *avahi_poll;
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static AvahiClient *avahi_client;
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static AvahiEntryGroup *avahi_group;
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static void
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AvahiRegisterService(AvahiClient *c);
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/**
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* Callback when the EntryGroup changes state.
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*/
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static void
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AvahiGroupCallback(AvahiEntryGroup *g,
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AvahiEntryGroupState state,
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gcc_unused void *userdata)
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{
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assert(g != nullptr);
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FormatDebug(avahi_domain,
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"Service group changed to state %d", state);
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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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FormatDefault(avahi_domain,
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"Service '%s' successfully established.",
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avahi_name);
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break;
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case AVAHI_ENTRY_GROUP_COLLISION:
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/* A service name collision happened. Let's pick a new name */
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{
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char *n = avahi_alternative_service_name(avahi_name);
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avahi_free(avahi_name);
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avahi_name = n;
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}
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FormatDefault(avahi_domain,
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"Service name collision, renaming service to '%s'",
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avahi_name);
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/* And recreate the services */
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AvahiRegisterService(avahi_entry_group_get_client(g));
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break;
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case AVAHI_ENTRY_GROUP_FAILURE:
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FormatError(avahi_domain,
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"Entry group failure: %s",
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avahi_strerror(avahi_client_errno(avahi_entry_group_get_client(g))));
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/* Some kind of failure happened while we were
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registering our services */
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break;
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case AVAHI_ENTRY_GROUP_UNCOMMITED:
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LogDebug(avahi_domain, "Service group is UNCOMMITED");
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break;
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case AVAHI_ENTRY_GROUP_REGISTERING:
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LogDebug(avahi_domain, "Service group is REGISTERING");
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}
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}
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/**
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* Registers a new service with avahi.
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*/
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static void
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AvahiRegisterService(AvahiClient *c)
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{
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assert(c != nullptr);
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FormatDebug(avahi_domain, "Registering service %s/%s",
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SERVICE_TYPE, avahi_name);
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/* If this is the first time we're called,
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* let's create a new entry group */
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if (!avahi_group) {
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avahi_group = avahi_entry_group_new(c, AvahiGroupCallback, nullptr);
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if (!avahi_group) {
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FormatError(avahi_domain,
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"Failed to create avahi EntryGroup: %s",
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avahi_strerror(avahi_client_errno(c)));
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return;
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}
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}
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/* Add the service */
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/* TODO: This currently binds to ALL interfaces.
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* We could maybe add a service per actual bound interface,
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* if that's better. */
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int result = avahi_entry_group_add_service(avahi_group,
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AVAHI_IF_UNSPEC,
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AVAHI_PROTO_UNSPEC,
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AvahiPublishFlags(0),
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avahi_name, SERVICE_TYPE,
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nullptr, nullptr,
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listen_port, nullptr);
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if (result < 0) {
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FormatError(avahi_domain, "Failed to add service %s: %s",
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SERVICE_TYPE, avahi_strerror(result));
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return;
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}
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/* Tell the server to register the service group */
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result = avahi_entry_group_commit(avahi_group);
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if (result < 0) {
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FormatError(avahi_domain, "Failed to commit service group: %s",
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avahi_strerror(result));
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return;
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}
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}
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/* Callback when avahi changes state */
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static void
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MyAvahiClientCallback(AvahiClient *c, AvahiClientState state,
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gcc_unused void *userdata)
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{
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assert(c != nullptr);
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/* Called whenever the client or server state changes */
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FormatDebug(avahi_domain, "Client changed to state %d", state);
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switch (state) {
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int reason;
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case AVAHI_CLIENT_S_RUNNING:
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LogDebug(avahi_domain, "Client is 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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if (avahi_group == nullptr)
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AvahiRegisterService(c);
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break;
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case AVAHI_CLIENT_FAILURE:
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reason = avahi_client_errno(c);
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if (reason == AVAHI_ERR_DISCONNECTED) {
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LogDefault(avahi_domain,
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"Client Disconnected, will reconnect shortly");
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if (avahi_group != nullptr) {
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avahi_entry_group_free(avahi_group);
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avahi_group = nullptr;
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}
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if (avahi_client != nullptr)
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avahi_client_free(avahi_client);
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avahi_client =
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avahi_client_new(avahi_poll,
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AVAHI_CLIENT_NO_FAIL,
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MyAvahiClientCallback, nullptr,
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&reason);
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if (avahi_client == nullptr)
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FormatWarning(avahi_domain,
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"Could not reconnect: %s",
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avahi_strerror(reason));
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} else {
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FormatWarning(avahi_domain,
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"Client failure: %s (terminal)",
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avahi_strerror(reason));
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}
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break;
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case AVAHI_CLIENT_S_COLLISION:
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LogDebug(avahi_domain, "Client is COLLISION");
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/* Let's drop our registered services. When the server
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is back in AVAHI_SERVER_RUNNING state we will
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register them again with the new host name. */
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if (avahi_group != nullptr) {
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LogDebug(avahi_domain, "Resetting group");
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avahi_entry_group_reset(avahi_group);
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}
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break;
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case AVAHI_CLIENT_S_REGISTERING:
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LogDebug(avahi_domain, "Client is 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 (avahi_group != nullptr) {
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LogDebug(avahi_domain, "Resetting group");
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avahi_entry_group_reset(avahi_group);
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}
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break;
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case AVAHI_CLIENT_CONNECTING:
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LogDebug(avahi_domain, "Client is CONNECTING");
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break;
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}
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}
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void
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AvahiInit(EventLoop &loop, const char *serviceName)
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{
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LogDebug(avahi_domain, "Initializing interface");
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if (!avahi_is_valid_service_name(serviceName))
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FormatFatalError("Invalid zeroconf_name \"%s\"", serviceName);
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avahi_name = avahi_strdup(serviceName);
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avahi_poll = new MyAvahiPoll(loop);
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int error;
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avahi_client = avahi_client_new(avahi_poll, AVAHI_CLIENT_NO_FAIL,
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MyAvahiClientCallback, nullptr,
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&error);
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if (avahi_client == nullptr) {
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FormatError(avahi_domain, "Failed to create client: %s",
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avahi_strerror(error));
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AvahiDeinit();
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}
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}
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void
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AvahiDeinit()
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{
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LogDebug(avahi_domain, "Shutting down interface");
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if (avahi_group != nullptr) {
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avahi_entry_group_free(avahi_group);
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avahi_group = nullptr;
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}
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if (avahi_client != nullptr) {
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avahi_client_free(avahi_client);
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avahi_client = nullptr;
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}
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delete avahi_poll;
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avahi_poll = nullptr;
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avahi_free(avahi_name);
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avahi_name = nullptr;
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dbus_shutdown();
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}
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