357 lines
9.2 KiB
C
357 lines
9.2 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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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <assert.h>
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#include <stdio.h>
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#include "avahi-malloc.h"
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#include "timeval.h"
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#include "dbus-watch-glue.h"
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static AvahiWatchEvent translate_dbus_to_avahi(unsigned int f) {
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AvahiWatchEvent e = 0;
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if (f & DBUS_WATCH_READABLE)
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e |= AVAHI_WATCH_IN;
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if (f & DBUS_WATCH_WRITABLE)
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e |= AVAHI_WATCH_OUT;
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if (f & DBUS_WATCH_ERROR)
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e |= AVAHI_WATCH_ERR;
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if (f & DBUS_WATCH_HANGUP)
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e |= AVAHI_WATCH_HUP;
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return e;
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}
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static unsigned int translate_avahi_to_dbus(AvahiWatchEvent e) {
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unsigned int f = 0;
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if (e & AVAHI_WATCH_IN)
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f |= DBUS_WATCH_READABLE;
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if (e & AVAHI_WATCH_OUT)
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f |= DBUS_WATCH_WRITABLE;
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if (e & AVAHI_WATCH_ERR)
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f |= DBUS_WATCH_ERROR;
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if (e & AVAHI_WATCH_HUP)
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f |= DBUS_WATCH_HANGUP;
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return f;
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}
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typedef struct {
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DBusConnection *connection;
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const AvahiPoll *poll_api;
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AvahiTimeout *dispatch_timeout;
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int ref;
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} ConnectionData;
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static ConnectionData *connection_data_ref(ConnectionData *d) {
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assert(d);
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assert(d->ref >= 1);
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d->ref++;
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return d;
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}
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static void connection_data_unref(ConnectionData *d) {
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assert(d);
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assert(d->ref >= 1);
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if (--d->ref <= 0) {
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d->poll_api->timeout_free(d->dispatch_timeout);
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avahi_free(d);
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}
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}
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static void request_dispatch(ConnectionData *d, int enable) {
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static const struct timeval tv = { 0, 0 };
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assert(d);
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if (enable) {
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assert(dbus_connection_get_dispatch_status(d->connection) == DBUS_DISPATCH_DATA_REMAINS);
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d->poll_api->timeout_update(d->dispatch_timeout, &tv);
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} else
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d->poll_api->timeout_update(d->dispatch_timeout, NULL);
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}
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static void dispatch_timeout_callback(AvahiTimeout *t, void *userdata) {
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ConnectionData *d = userdata;
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assert(t);
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assert(d);
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connection_data_ref(d);
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dbus_connection_ref(d->connection);
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if (dbus_connection_dispatch(d->connection) == DBUS_DISPATCH_DATA_REMAINS)
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/* If there's still data, request that this handler is called again */
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request_dispatch(d, 1);
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else
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request_dispatch(d, 0);
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dbus_connection_unref(d->connection);
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connection_data_unref(d);
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}
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static void watch_callback(AvahiWatch *avahi_watch, AVAHI_GCC_UNUSED int fd, AvahiWatchEvent events, void *userdata) {
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DBusWatch *dbus_watch = userdata;
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assert(avahi_watch);
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assert(dbus_watch);
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dbus_watch_handle(dbus_watch, translate_avahi_to_dbus(events));
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/* Ignore the return value */
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}
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static dbus_bool_t update_watch(const AvahiPoll *poll_api, DBusWatch *dbus_watch) {
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AvahiWatch *avahi_watch;
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dbus_bool_t b;
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assert(dbus_watch);
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avahi_watch = dbus_watch_get_data(dbus_watch);
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b = dbus_watch_get_enabled(dbus_watch);
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if (b && !avahi_watch) {
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if (!(avahi_watch = poll_api->watch_new(
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poll_api,
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#if (DBUS_VERSION_MAJOR == 1 && DBUS_VERSION_MINOR == 1 && DBUS_VERSION_MICRO >= 1) || (DBUS_VERSION_MAJOR == 1 && DBUS_VERSION_MINOR > 1) || (DBUS_VERSION_MAJOR > 1)
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dbus_watch_get_unix_fd(dbus_watch),
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#else
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dbus_watch_get_fd(dbus_watch),
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#endif
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translate_dbus_to_avahi(dbus_watch_get_flags(dbus_watch)),
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watch_callback,
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dbus_watch)))
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return FALSE;
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dbus_watch_set_data(dbus_watch, avahi_watch, NULL);
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} else if (!b && avahi_watch) {
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poll_api->watch_free(avahi_watch);
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dbus_watch_set_data(dbus_watch, NULL, NULL);
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} else if (avahi_watch) {
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/* Update flags */
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poll_api->watch_update(avahi_watch, dbus_watch_get_flags(dbus_watch));
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}
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return TRUE;
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}
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static dbus_bool_t add_watch(DBusWatch *dbus_watch, void *userdata) {
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ConnectionData *d = userdata;
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assert(dbus_watch);
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assert(d);
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return update_watch(d->poll_api, dbus_watch);
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}
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static void remove_watch(DBusWatch *dbus_watch, void *userdata) {
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ConnectionData *d = userdata;
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AvahiWatch *avahi_watch;
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assert(dbus_watch);
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assert(d);
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if ((avahi_watch = dbus_watch_get_data(dbus_watch))) {
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d->poll_api->watch_free(avahi_watch);
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dbus_watch_set_data(dbus_watch, NULL, NULL);
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}
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}
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static void watch_toggled(DBusWatch *dbus_watch, void *userdata) {
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ConnectionData *d = userdata;
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assert(dbus_watch);
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assert(d);
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update_watch(d->poll_api, dbus_watch);
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}
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typedef struct TimeoutData {
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const AvahiPoll *poll_api;
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AvahiTimeout *avahi_timeout;
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DBusTimeout *dbus_timeout;
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int ref;
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} TimeoutData;
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static TimeoutData* timeout_data_ref(TimeoutData *t) {
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assert(t);
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assert(t->ref >= 1);
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t->ref++;
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return t;
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}
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static void timeout_data_unref(TimeoutData *t) {
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assert(t);
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assert(t->ref >= 1);
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if (--t->ref <= 0) {
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if (t->avahi_timeout)
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t->poll_api->timeout_free(t->avahi_timeout);
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avahi_free(t);
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}
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}
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static void update_timeout(TimeoutData *timeout) {
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assert(timeout);
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assert(timeout->ref >= 1);
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if (dbus_timeout_get_enabled(timeout->dbus_timeout)) {
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struct timeval tv;
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avahi_elapse_time(&tv, dbus_timeout_get_interval(timeout->dbus_timeout), 0);
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timeout->poll_api->timeout_update(timeout->
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avahi_timeout, &tv);
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} else
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timeout->poll_api->timeout_update(timeout->avahi_timeout, NULL);
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}
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static void timeout_callback(AvahiTimeout *avahi_timeout, void *userdata) {
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TimeoutData *timeout = userdata;
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assert(avahi_timeout);
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assert(timeout);
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timeout_data_ref(timeout);
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dbus_timeout_handle(timeout->dbus_timeout);
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/* Ignore the return value */
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if (timeout->avahi_timeout)
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update_timeout(timeout);
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timeout_data_unref(timeout);
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}
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static dbus_bool_t add_timeout(DBusTimeout *dbus_timeout, void *userdata) {
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TimeoutData *timeout;
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ConnectionData *d = userdata;
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struct timeval tv;
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dbus_bool_t b;
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assert(dbus_timeout);
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assert(d);
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if (!(timeout = avahi_new(TimeoutData, 1)))
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return FALSE;
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timeout->dbus_timeout = dbus_timeout;
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timeout->poll_api = d->poll_api;
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timeout->ref = 1;
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if ((b = dbus_timeout_get_enabled(dbus_timeout)))
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avahi_elapse_time(&tv, dbus_timeout_get_interval(dbus_timeout), 0);
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if (!(timeout->avahi_timeout = d->poll_api->timeout_new(
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d->poll_api,
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b ? &tv : NULL,
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timeout_callback,
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timeout))) {
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avahi_free(timeout);
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return FALSE;
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}
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dbus_timeout_set_data(dbus_timeout, timeout, (DBusFreeFunction) timeout_data_unref);
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return TRUE;
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}
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static void remove_timeout(DBusTimeout *dbus_timeout, void *userdata) {
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ConnectionData *d = userdata;
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TimeoutData *timeout;
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assert(dbus_timeout);
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assert(d);
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timeout = dbus_timeout_get_data(dbus_timeout);
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assert(timeout);
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d->poll_api->timeout_free(timeout->avahi_timeout);
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timeout->avahi_timeout = NULL;
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}
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static void timeout_toggled(DBusTimeout *dbus_timeout, AVAHI_GCC_UNUSED void *userdata) {
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TimeoutData *timeout;
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assert(dbus_timeout);
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timeout = dbus_timeout_get_data(dbus_timeout);
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assert(timeout);
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update_timeout(timeout);
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}
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static void dispatch_status(AVAHI_GCC_UNUSED DBusConnection *connection, DBusDispatchStatus new_status, void *userdata) {
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ConnectionData *d = userdata;
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if (new_status == DBUS_DISPATCH_DATA_REMAINS)
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request_dispatch(d, 1);
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}
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int avahi_dbus_connection_glue(DBusConnection *c, const AvahiPoll *poll_api) {
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ConnectionData *d = NULL;
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assert(c);
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assert(poll_api);
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if (!(d = avahi_new(ConnectionData, 1)))
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goto fail;;
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d->poll_api = poll_api;
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d->connection = c;
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d->ref = 1;
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if (!(d->dispatch_timeout = poll_api->timeout_new(poll_api, NULL, dispatch_timeout_callback, d)))
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goto fail;
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if (!(dbus_connection_set_watch_functions(c, add_watch, remove_watch, watch_toggled, connection_data_ref(d), (DBusFreeFunction)connection_data_unref)))
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goto fail;
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if (!(dbus_connection_set_timeout_functions(c, add_timeout, remove_timeout, timeout_toggled, connection_data_ref(d), (DBusFreeFunction)connection_data_unref)))
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goto fail;
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dbus_connection_set_dispatch_status_function(c, dispatch_status, connection_data_ref(d), (DBusFreeFunction)connection_data_unref);
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if (dbus_connection_get_dispatch_status(c) == DBUS_DISPATCH_DATA_REMAINS)
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request_dispatch(d, 1);
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connection_data_unref(d);
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return 0;
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fail:
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if (d) {
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d->poll_api->timeout_free(d->dispatch_timeout);
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avahi_free(d);
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}
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return -1;
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}
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