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-rw-r--r--sd/source/ui/remotecontrol/AvahiNetworkService.cxx209
1 files changed, 209 insertions, 0 deletions
diff --git a/sd/source/ui/remotecontrol/AvahiNetworkService.cxx b/sd/source/ui/remotecontrol/AvahiNetworkService.cxx
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+++ b/sd/source/ui/remotecontrol/AvahiNetworkService.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <config_dbus.h>
+
+#include <iostream>
+#include <limits>
+#include <new>
+#include <assert.h>
+
+#include <avahi-client/client.h>
+#include <avahi-client/publish.h>
+
+#include <avahi-common/alternative.h>
+#include <avahi-common/error.h>
+#include <avahi-common/thread-watch.h>
+#include <comphelper/random.hxx>
+
+#if ENABLE_DBUS
+#include <dbus/dbus.h>
+#endif
+
+#include <sal/log.hxx>
+
+#include "AvahiNetworkService.hxx"
+#include "ZeroconfService.hxx"
+
+using namespace sd;
+
+static AvahiClient *client = nullptr;
+static AvahiThreadedPoll *threaded_poll = nullptr;
+static AvahiEntryGroup *group = nullptr;
+static AvahiNetworkService *avahiService = nullptr;
+
+static bool create_services(AvahiClient *c);
+
+static void entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, AVAHI_GCC_UNUSED void *userdata) {
+ assert(g == group || group == nullptr);
+ group = g;
+
+ /* Called whenever the entry group state changes */
+
+ switch (state) {
+ case AVAHI_ENTRY_GROUP_ESTABLISHED :
+ /* The entry group has been established successfully */
+ SAL_INFO( "sdremote.wifi", "Service '" << avahiService->getName() << "' successfully established." );
+ break;
+
+ case AVAHI_ENTRY_GROUP_COLLISION : {
+ char *n;
+
+ /* A service name collision with a remote service
+ * happened. Let's pick a new name */
+ n = avahi_alternative_service_name(avahiService->getName().c_str());
+ avahiService->setName(n);
+
+ SAL_INFO( "sdremote.wifi", "Service name collision, renaming service to '" << avahiService->getName() << "'");
+
+ /* And recreate the services */
+ create_services(avahi_entry_group_get_client(g));
+ break;
+ }
+
+ case AVAHI_ENTRY_GROUP_FAILURE :
+
+ SAL_WARN("sdremote.wifi", "Entry group failure: " << avahi_strerror(avahi_client_errno(avahi_entry_group_get_client(g))));
+
+ /* Some kind of failure happened while we were registering our services */
+ avahi_threaded_poll_quit(threaded_poll);
+ break;
+
+ case AVAHI_ENTRY_GROUP_UNCOMMITED:
+ case AVAHI_ENTRY_GROUP_REGISTERING:
+ ;
+ }
+}
+
+static bool create_services(AvahiClient *c) {
+ assert(c);
+
+ /* If this is the first time we're called, let's create a new
+ * entry group if necessary */
+ if(!client)
+ return false;
+
+ if (!group)
+ if (!(group = avahi_entry_group_new(c, entry_group_callback, nullptr))) {
+ SAL_WARN("sdremote.wifi", "avahi_entry_group_new() failed: " << avahi_strerror(avahi_client_errno(c)));
+ avahiService->clear();
+ return false;
+ }
+
+ /* If the group is empty (either because it was just created, or
+ * because it was reset previously, add our entries. */
+
+ if (avahi_entry_group_is_empty(group)) {
+ SAL_INFO("sdremote.wifi", "Adding service '" << avahiService->getName() << "'");
+ char r[128];
+ int nRandom = comphelper::rng::uniform_int_distribution(0, std::numeric_limits<int>::max());
+ snprintf(r, sizeof(r), "random=%i", nRandom);
+ int ret = avahi_entry_group_add_service(
+ group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, static_cast<AvahiPublishFlags>(0),
+ avahiService->getName().c_str(), kREG_TYPE, nullptr, nullptr, 1599, "local", r, nullptr
+ );
+ if (ret < 0) {
+
+ if (ret == AVAHI_ERR_COLLISION){
+ /* A service name collision with a local service happened. Let's
+ * pick a new name */
+ char *n = avahi_alternative_service_name(avahiService->getName().c_str());
+ avahiService->setName(n);
+
+ SAL_WARN("sdremote.wifi", "Service name collision, renaming service to '" << avahiService->getName() << "'");
+
+ avahi_entry_group_reset(group);
+
+ return create_services(c);
+ }
+
+ SAL_WARN("sdremote.wifi", "Failed to add _impressremote._tcp service: " << avahi_strerror(ret));
+ avahiService->clear();
+ return false;
+ }
+
+ /* Tell the server to register the service */
+ if ((ret = avahi_entry_group_commit(group)) < 0) {
+ SAL_WARN("sdremote.wifi", "Failed to commit entry group: " << avahi_strerror(ret));
+ avahiService->clear();
+ return false;
+ }
+ }
+
+ return true; //Services we're already created
+}
+
+static void client_callback(AvahiClient *c, AvahiClientState state, AVAHI_GCC_UNUSED void * userdata) {
+ assert(c);
+
+ /* Called whenever the client or server state changes */
+
+ switch (state) {
+ case AVAHI_CLIENT_S_RUNNING:
+ create_services(c);
+ break;
+ case AVAHI_CLIENT_FAILURE:
+ SAL_WARN("sdremote.wifi", "Client failure: " << avahi_strerror(avahi_client_errno(c)));
+ avahiService->clear();
+ break;
+ case AVAHI_CLIENT_S_COLLISION:
+ case AVAHI_CLIENT_S_REGISTERING:
+ if (group)
+ avahi_entry_group_reset(group);
+ break;
+ case AVAHI_CLIENT_CONNECTING:
+ ;
+ }
+}
+
+void AvahiNetworkService::setup() {
+#if ENABLE_DBUS
+ // Sure, without ENABLE_DBUS it probably makes no sense to try to use this Avahi stuff either,
+ // but this is just a stop-gap measure to get this to even compile for now with the probably
+ // pointless combination of configurable options --enable-avahi --enable-dbus --disable-gui.
+
+ // Avahi internally uses D-Bus, which requires the following in order to be
+ // thread-safe (and we potentially access D-Bus from different threads in
+ // different places of the code base):
+ if (!dbus_threads_init_default()) {
+ throw std::bad_alloc();
+ }
+#endif
+
+ int error = 0;
+ avahiService = this;
+ if (!(threaded_poll = avahi_threaded_poll_new())) {
+ SAL_WARN("sdremote.wifi", "avahi_threaded_poll_new '" << avahiService->getName() << "' failed");
+ return;
+ }
+
+ if (!(client = avahi_client_new(avahi_threaded_poll_get(threaded_poll), static_cast<AvahiClientFlags>(0), client_callback, nullptr, &error))) {
+ SAL_WARN("sdremote.wifi", "avahi_client_new failed");
+ return;
+ }
+
+ if(!create_services(client))
+ return;
+
+ /* Finally, start the event loop thread */
+ if (avahi_threaded_poll_start(threaded_poll) < 0) {
+ SAL_WARN("sdremote.wifi", "avahi_threaded_poll_start failed");
+ return;
+ }
+}
+
+void AvahiNetworkService::clear() {
+ /* Call this when the app shuts down */
+ if(threaded_poll)
+ avahi_threaded_poll_stop(threaded_poll);
+ if(client)
+ avahi_client_free(client);
+ if(threaded_poll)
+ avahi_threaded_poll_free(threaded_poll);
+}