28bcb8bdf5
Replaced all occurrences of g_error() with MPD_ERROR() located in a new header file 'mpd_error.h'. This macro uses g_critical() to print the error message and then exits gracefully in contrast to g_error() which would internally call abort() to produce a core dump. The macro name is distinctive and allows to find all places with dubious error handling. The long-term goal is to get rid of MPD_ERROR() altogether. To facilitate the eventual removal of this macro it was added in a new header file rather than to an existing header file. This fixes #2995 and #3007.
268 lines
6.8 KiB
C
268 lines
6.8 KiB
C
/*
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* Copyright (C) 2003-2010 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 "zeroconf-internal.h"
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#include "listen.h"
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#include "mpd_error.h"
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#include <glib.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/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 <avahi-glib/glib-watch.h>
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#undef G_LOG_DOMAIN
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#define G_LOG_DOMAIN "avahi"
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static char *avahiName;
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static int avahiRunning;
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static AvahiGLibPoll *avahi_glib_poll;
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static const AvahiPoll *avahi_poll;
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static AvahiClient *avahiClient;
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static AvahiEntryGroup *avahiGroup;
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static void avahiRegisterService(AvahiClient * c);
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/* Callback when the EntryGroup changes state */
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static void avahiGroupCallback(AvahiEntryGroup * g,
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AvahiEntryGroupState state,
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G_GNUC_UNUSED void *userdata)
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{
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char *n;
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assert(g);
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g_debug("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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g_message("Service '%s' successfully established.",
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avahiName);
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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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n = avahi_alternative_service_name(avahiName);
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avahi_free(avahiName);
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avahiName = n;
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g_message("Service name collision, renaming service to '%s'",
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avahiName);
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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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g_warning("Entry group failure: %s",
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avahi_strerror(avahi_client_errno
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(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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avahiRunning = 0;
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break;
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case AVAHI_ENTRY_GROUP_UNCOMMITED:
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g_debug("Service group is UNCOMMITED");
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break;
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case AVAHI_ENTRY_GROUP_REGISTERING:
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g_debug("Service group is REGISTERING");
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}
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}
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/* Registers a new service with avahi */
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static void avahiRegisterService(AvahiClient * c)
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{
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int ret;
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assert(c);
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g_debug("Registering service %s/%s", SERVICE_TYPE, avahiName);
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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 (!avahiGroup) {
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avahiGroup = avahi_entry_group_new(c, avahiGroupCallback, NULL);
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if (!avahiGroup) {
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g_warning("Failed to create avahi EntryGroup: %s",
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avahi_strerror(avahi_client_errno(c)));
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goto fail;
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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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ret = avahi_entry_group_add_service(avahiGroup,
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AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
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0, avahiName, SERVICE_TYPE, NULL,
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NULL, listen_port, NULL);
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if (ret < 0) {
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g_warning("Failed to add service %s: %s", SERVICE_TYPE,
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avahi_strerror(ret));
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goto fail;
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}
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/* Tell the server to register the service group */
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ret = avahi_entry_group_commit(avahiGroup);
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if (ret < 0) {
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g_warning("Failed to commit service group: %s",
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avahi_strerror(ret));
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goto fail;
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}
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return;
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fail:
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avahiRunning = 0;
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}
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/* Callback when avahi changes state */
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static void avahiClientCallback(AvahiClient * c, AvahiClientState state,
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G_GNUC_UNUSED void *userdata)
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{
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int reason;
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assert(c);
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/* Called whenever the client or server state changes */
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g_debug("Client changed to state %d", state);
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switch (state) {
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case AVAHI_CLIENT_S_RUNNING:
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g_debug("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 (!avahiGroup)
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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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g_message("Client Disconnected, will reconnect shortly");
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if (avahiGroup) {
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avahi_entry_group_free(avahiGroup);
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avahiGroup = NULL;
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}
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if (avahiClient)
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avahi_client_free(avahiClient);
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avahiClient =
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avahi_client_new(avahi_poll,
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AVAHI_CLIENT_NO_FAIL,
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avahiClientCallback, NULL,
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&reason);
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if (!avahiClient) {
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g_warning("Could not reconnect: %s",
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avahi_strerror(reason));
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avahiRunning = 0;
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}
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} else {
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g_warning("Client failure: %s (terminal)",
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avahi_strerror(reason));
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avahiRunning = 0;
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}
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break;
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case AVAHI_CLIENT_S_COLLISION:
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g_debug("Client is 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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if (avahiGroup) {
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g_debug("Resetting group");
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avahi_entry_group_reset(avahiGroup);
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}
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case AVAHI_CLIENT_S_REGISTERING:
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g_debug("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 (avahiGroup) {
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g_debug("Resetting group");
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avahi_entry_group_reset(avahiGroup);
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}
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break;
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case AVAHI_CLIENT_CONNECTING:
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g_debug("Client is CONNECTING");
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}
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}
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void init_avahi(const char *serviceName)
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{
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int error;
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g_debug("Initializing interface");
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if (!avahi_is_valid_service_name(serviceName))
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MPD_ERROR("Invalid zeroconf_name \"%s\"", serviceName);
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avahiName = avahi_strdup(serviceName);
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avahiRunning = 1;
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avahi_glib_poll = avahi_glib_poll_new(NULL, G_PRIORITY_DEFAULT);
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avahi_poll = avahi_glib_poll_get(avahi_glib_poll);
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avahiClient = avahi_client_new(avahi_poll, AVAHI_CLIENT_NO_FAIL,
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avahiClientCallback, NULL, &error);
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if (!avahiClient) {
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g_warning("Failed to create client: %s",
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avahi_strerror(error));
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goto fail;
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}
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return;
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fail:
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avahi_finish();
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}
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void avahi_finish(void)
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{
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g_debug("Shutting down interface");
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if (avahiGroup) {
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avahi_entry_group_free(avahiGroup);
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avahiGroup = NULL;
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}
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if (avahiClient) {
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avahi_client_free(avahiClient);
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avahiClient = NULL;
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}
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if (avahi_glib_poll != NULL) {
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avahi_glib_poll_free(avahi_glib_poll);
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avahi_glib_poll = NULL;
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}
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avahi_free(avahiName);
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avahiName = NULL;
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}
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