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/*
* Remmina - The GTK+ Remote Desktop Client
* Copyright (C) 2009-2010 Vic Lee
* Copyright (C) 2014-2015 Antenore Gatta, Fabio Castelli, Giovanni Panozzo
* Copyright (C) 2016-2020 Antenore Gatta, Giovanni Panozzo
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. * If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. * If you
* do not wish to do so, delete this exception statement from your
* version. * If you delete this exception statement from all source
* files in the program, then also delete it here.
*
*/
#include <gtk/gtk.h>
#include "config.h"
#include "remmina_avahi.h"
#include "remmina/remmina_trace_calls.h"
#ifdef HAVE_LIBAVAHI_CLIENT
#include <avahi-client/client.h>
#include <avahi-client/lookup.h>
#include <avahi-common/simple-watch.h>
#include <avahi-common/malloc.h>
#include <avahi-common/error.h>
struct _RemminaAvahiPriv {
AvahiSimplePoll* simple_poll;
AvahiClient* client;
AvahiServiceBrowser* sb;
guint iterate_handler;
gboolean has_event;
};
static void
remmina_avahi_resolve_callback(
AvahiServiceResolver* r,
AVAHI_GCC_UNUSED AvahiIfIndex interface,
AVAHI_GCC_UNUSED AvahiProtocol protocol,
AvahiResolverEvent event,
const char* name,
const char* type,
const char* domain,
const char* host_name,
const AvahiAddress* address,
uint16_t port,
AvahiStringList* txt,
AvahiLookupResultFlags flags,
AVAHI_GCC_UNUSED void* userdata)
{
TRACE_CALL(__func__);
gchar* key;
gchar* value;
RemminaAvahi* ga = (RemminaAvahi*)userdata;
assert(r);
ga->priv->has_event = TRUE;
switch (event) {
case AVAHI_RESOLVER_FAILURE:
g_print("(remmina-applet avahi-resolver) Failed to resolve service '%s' of type '%s' in domain '%s': %s\n",
name, type, domain, avahi_strerror(avahi_client_errno(avahi_service_resolver_get_client(r))));
break;
case AVAHI_RESOLVER_FOUND:
key = g_strdup_printf("%s,%s,%s", name, type, domain);
if (g_hash_table_lookup(ga->discovered_services, key)) {
g_free(key);
break;
}
value = g_strdup_printf("[%s]:%i", host_name, port);
g_hash_table_insert(ga->discovered_services, key, value);
/* key and value will be freed with g_free when the has table is freed */
g_print("(remmina-applet avahi-resolver) Added service '%s'\n", value);
break;
}
avahi_service_resolver_free(r);
}
static void
remmina_avahi_browse_callback(
AvahiServiceBrowser* b,
AvahiIfIndex interface,
AvahiProtocol protocol,
AvahiBrowserEvent event,
const char* name,
const char* type,
const char* domain,
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
void* userdata)
{
TRACE_CALL(__func__);
gchar* key;
RemminaAvahi* ga = (RemminaAvahi*)userdata;
assert(b);
ga->priv->has_event = TRUE;
switch (event) {
case AVAHI_BROWSER_FAILURE:
g_print("(remmina-applet avahi-browser) %s\n",
avahi_strerror(avahi_client_errno(avahi_service_browser_get_client(b))));
return;
case AVAHI_BROWSER_NEW:
key = g_strdup_printf("%s,%s,%s", name, type, domain);
if (g_hash_table_lookup(ga->discovered_services, key)) {
g_free(key);
break;
}
g_free(key);
g_print("(remmina-applet avahi-browser) Found service '%s' of type '%s' in domain '%s'\n", name, type, domain);
if (!(avahi_service_resolver_new(ga->priv->client, interface, protocol, name, type, domain,
AVAHI_PROTO_UNSPEC, 0, remmina_avahi_resolve_callback, ga))) {
g_print("(remmina-applet avahi-browser) Failed to resolve service '%s': %s\n",
name, avahi_strerror(avahi_client_errno(ga->priv->client)));
}
break;
case AVAHI_BROWSER_REMOVE:
g_print("(remmina-applet avahi-browser) Removed service '%s' of type '%s' in domain '%s'\n", name, type, domain);
key = g_strdup_printf("%s,%s,%s", name, type, domain);
g_hash_table_remove(ga->discovered_services, key);
g_free(key);
break;
case AVAHI_BROWSER_ALL_FOR_NOW:
case AVAHI_BROWSER_CACHE_EXHAUSTED:
break;
}
}
static void remmina_avahi_client_callback(AvahiClient* c, AvahiClientState state, AVAHI_GCC_UNUSED void * userdata)
{
TRACE_CALL(__func__);
RemminaAvahi* ga = (RemminaAvahi*)userdata;
ga->priv->has_event = TRUE;
if (state == AVAHI_CLIENT_FAILURE) {
g_print("(remmina-applet avahi) Server connection failure: %s\n", avahi_strerror(avahi_client_errno(c)));
}
}
static gboolean remmina_avahi_iterate(RemminaAvahi* ga)
{
TRACE_CALL(__func__);
while (TRUE) {
/* Call the iteration until no further events */
ga->priv->has_event = FALSE;
avahi_simple_poll_iterate(ga->priv->simple_poll, 0);
if (!ga->priv->has_event)
break;
}
return TRUE;
}
RemminaAvahi* remmina_avahi_new(void)
{
TRACE_CALL(__func__);
RemminaAvahi* ga;
ga = g_new(RemminaAvahi, 1);
ga->discovered_services = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_free);
ga->started = FALSE;
ga->priv = g_new(RemminaAvahiPriv, 1);
ga->priv->simple_poll = NULL;
ga->priv->client = NULL;
ga->priv->sb = NULL;
ga->priv->iterate_handler = 0;
ga->priv->has_event = FALSE;
return ga;
}
void remmina_avahi_start(RemminaAvahi* ga)
{
TRACE_CALL(__func__);
int error;
if (ga->started)
return;
ga->started = TRUE;
ga->priv->simple_poll = avahi_simple_poll_new();
if (!ga->priv->simple_poll) {
g_print("Failed to create simple poll object.\n");
return;
}
ga->priv->client = avahi_client_new(avahi_simple_poll_get(ga->priv->simple_poll), 0, remmina_avahi_client_callback, ga,
&error);
if (!ga->priv->client) {
g_print("Failed to create client: %s\n", avahi_strerror(error));
return;
}
/** @todo Customize the default domain here */
ga->priv->sb = avahi_service_browser_new(ga->priv->client, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, "_rfb._tcp", NULL, 0,
remmina_avahi_browse_callback, ga);
if (!ga->priv->sb) {
g_print("Failed to create service browser: %s\n", avahi_strerror(avahi_client_errno(ga->priv->client)));
return;
}
ga->priv->iterate_handler = g_timeout_add(5000, (GSourceFunc)remmina_avahi_iterate, ga);
}
void remmina_avahi_stop(RemminaAvahi* ga)
{
TRACE_CALL(__func__);
g_hash_table_remove_all(ga->discovered_services);
if (ga->priv->iterate_handler) {
g_source_remove(ga->priv->iterate_handler);
ga->priv->iterate_handler = 0;
}
if (ga->priv->sb) {
avahi_service_browser_free(ga->priv->sb);
ga->priv->sb = NULL;
}
if (ga->priv->client) {
avahi_client_free(ga->priv->client);
ga->priv->client = NULL;
}
if (ga->priv->simple_poll) {
avahi_simple_poll_free(ga->priv->simple_poll);
ga->priv->simple_poll = NULL;
}
ga->started = FALSE;
}
void remmina_avahi_free(RemminaAvahi* ga)
{
TRACE_CALL(__func__);
if (ga == NULL)
return;
remmina_avahi_stop(ga);
g_free(ga->priv);
g_hash_table_destroy(ga->discovered_services);
g_free(ga);
}
#else
RemminaAvahi* remmina_avahi_new(void)
{
TRACE_CALL(__func__);
return NULL;
}
void remmina_avahi_start(RemminaAvahi* ga)
{
TRACE_CALL(__func__);
}
void remmina_avahi_stop(RemminaAvahi* ga)
{
TRACE_CALL(__func__);
}
void remmina_avahi_free(RemminaAvahi* ga)
{
TRACE_CALL(__func__);
}
#endif
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