zeroconf: moved code to zeroconf-avahi.c and zeroconf-bonjour.c
Moved implementation specific code to their own sources, internal declarations in zeroconf-internal.h.
This commit is contained in:
Max Kellermann
480
src/zeroconf-avahi.c
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480
src/zeroconf-avahi.c
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@@ -0,0 +1,480 @@
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/*
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* Copyright (C) 2003-2008 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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "zeroconf-internal.h"
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#include "listen.h"
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#include "utils.h"
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#include "ioops.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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#undef G_LOG_DOMAIN
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#define G_LOG_DOMAIN "avahi"
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static struct ioOps zeroConfIo;
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static char *avahiName;
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static int avahiRunning;
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static AvahiPoll avahiPoll;
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static AvahiClient *avahiClient;
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static AvahiEntryGroup *avahiGroup;
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static int avahiFdset(fd_set * rfds, fd_set * wfds, fd_set * efds);
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static int avahiFdconsume(int fdCount, fd_set * rfds, fd_set * wfds,
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fd_set * efds);
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struct AvahiWatch {
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struct AvahiWatch *prev;
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struct AvahiWatch *next;
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int fd;
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AvahiWatchEvent requestedEvent;
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AvahiWatchEvent observedEvent;
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AvahiWatchCallback callback;
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void *userdata;
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};
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struct AvahiTimeout {
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struct AvahiTimeout *prev;
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struct AvahiTimeout *next;
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struct timeval expiry;
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int enabled;
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AvahiTimeoutCallback callback;
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void *userdata;
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};
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static AvahiWatch *avahiWatchList;
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static AvahiTimeout *avahiTimeoutList;
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static AvahiWatch *avahiWatchNew(G_GNUC_UNUSED const AvahiPoll * api, int fd,
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AvahiWatchEvent event,
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AvahiWatchCallback callback, void *userdata)
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{
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struct AvahiWatch *newWatch = xmalloc(sizeof(struct AvahiWatch));
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newWatch->fd = fd;
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newWatch->requestedEvent = event;
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newWatch->observedEvent = 0;
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newWatch->callback = callback;
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newWatch->userdata = userdata;
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/* Insert at front of list */
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newWatch->next = avahiWatchList;
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avahiWatchList = newWatch;
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newWatch->prev = NULL;
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if (newWatch->next)
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newWatch->next->prev = newWatch;
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return newWatch;
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}
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static void avahiWatchUpdate(AvahiWatch * w, AvahiWatchEvent event)
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{
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assert(w != NULL);
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w->requestedEvent = event;
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}
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static AvahiWatchEvent avahiWatchGetEvents(AvahiWatch * w)
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{
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assert(w != NULL);
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return w->observedEvent;
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}
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static void avahiWatchFree(AvahiWatch * w)
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{
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assert(w != NULL);
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if (avahiWatchList == w)
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avahiWatchList = w->next;
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else if (w->prev != NULL)
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w->prev->next = w->next;
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free(w);
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}
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static void avahiCheckExpiry(AvahiTimeout * t)
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{
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assert(t != NULL);
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if (t->enabled) {
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struct timeval now;
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gettimeofday(&now, NULL);
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if (timercmp(&now, &(t->expiry), >)) {
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t->enabled = 0;
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t->callback(t, t->userdata);
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}
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}
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}
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static void avahiTimeoutUpdate(AvahiTimeout * t, const struct timeval *tv)
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{
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assert(t != NULL);
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if (tv) {
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t->enabled = 1;
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t->expiry.tv_sec = tv->tv_sec;
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t->expiry.tv_usec = tv->tv_usec;
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} else {
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t->enabled = 0;
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}
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}
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static void avahiTimeoutFree(AvahiTimeout * t)
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{
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assert(t != NULL);
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if (avahiTimeoutList == t)
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avahiTimeoutList = t->next;
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else if (t->prev != NULL)
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t->prev->next = t->next;
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free(t);
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}
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static AvahiTimeout *avahiTimeoutNew(G_GNUC_UNUSED const AvahiPoll * api,
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const struct timeval *tv,
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AvahiTimeoutCallback callback,
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void *userdata)
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{
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struct AvahiTimeout *newTimeout = xmalloc(sizeof(struct AvahiTimeout));
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newTimeout->callback = callback;
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newTimeout->userdata = userdata;
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avahiTimeoutUpdate(newTimeout, tv);
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/* Insert at front of list */
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newTimeout->next = avahiTimeoutList;
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avahiTimeoutList = newTimeout;
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newTimeout->prev = NULL;
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if (newTimeout->next)
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newTimeout->next->prev = newTimeout;
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return newTimeout;
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}
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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, boundPort, 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(&avahiPoll,
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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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static int avahiFdset(fd_set * rfds, fd_set * wfds, fd_set * efds)
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{
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AvahiWatch *w;
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int maxfd = -1;
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if (!avahiRunning)
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return maxfd;
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for (w = avahiWatchList; w != NULL; w = w->next) {
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if (w->requestedEvent & AVAHI_WATCH_IN) {
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FD_SET(w->fd, rfds);
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}
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if (w->requestedEvent & AVAHI_WATCH_OUT) {
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FD_SET(w->fd, wfds);
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}
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if (w->requestedEvent & AVAHI_WATCH_ERR) {
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FD_SET(w->fd, efds);
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}
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if (w->requestedEvent & AVAHI_WATCH_HUP) {
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g_warning("No support for HUP events! (ignoring)");
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}
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if (w->fd > maxfd)
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maxfd = w->fd;
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}
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return maxfd;
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}
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static int avahiFdconsume(int fdCount, fd_set * rfds, fd_set * wfds,
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fd_set * efds)
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{
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int retval = fdCount;
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AvahiTimeout *t;
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AvahiWatch *w = avahiWatchList;
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while (w != NULL && retval > 0) {
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AvahiWatch *current = w;
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current->observedEvent = 0;
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if (FD_ISSET(current->fd, rfds)) {
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current->observedEvent |= AVAHI_WATCH_IN;
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FD_CLR(current->fd, rfds);
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retval--;
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}
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if (FD_ISSET(current->fd, wfds)) {
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current->observedEvent |= AVAHI_WATCH_OUT;
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FD_CLR(current->fd, wfds);
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retval--;
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}
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if (FD_ISSET(current->fd, efds)) {
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current->observedEvent |= AVAHI_WATCH_ERR;
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FD_CLR(current->fd, efds);
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retval--;
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}
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/* Advance to the next one right now, in case the callback
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* removes itself
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*/
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w = w->next;
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if (current->observedEvent && avahiRunning) {
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current->callback(current, current->fd,
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current->observedEvent,
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current->userdata);
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}
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}
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t = avahiTimeoutList;
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while (t != NULL && avahiRunning) {
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AvahiTimeout *current = t;
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/* Advance to the next one right now, in case the callback
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* removes itself
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*/
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t = t->next;
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avahiCheckExpiry(current);
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}
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return retval;
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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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g_error("Invalid zeroconf_name \"%s\"", serviceName);
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avahiName = avahi_strdup(serviceName);
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avahiRunning = 1;
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avahiPoll.userdata = NULL;
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avahiPoll.watch_new = avahiWatchNew;
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avahiPoll.watch_update = avahiWatchUpdate;
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avahiPoll.watch_get_events = avahiWatchGetEvents;
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avahiPoll.watch_free = avahiWatchFree;
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avahiPoll.timeout_new = avahiTimeoutNew;
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avahiPoll.timeout_update = avahiTimeoutUpdate;
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avahiPoll.timeout_free = avahiTimeoutFree;
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avahiClient = avahi_client_new(&avahiPoll, 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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zeroConfIo.fdset = avahiFdset;
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zeroConfIo.consume = avahiFdconsume;
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registerIO(&zeroConfIo);
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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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deregisterIO(&zeroConfIo);
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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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avahi_free(avahiName);
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avahiName = NULL;
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}
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