From ed5640d8b587fbcfed7dd7967f3de04b37a76f26 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 11:06:44 +0200 Subject: Adding upstream version 4:7.4.7. Signed-off-by: Daniel Baumann --- sd/source/ui/remotecontrol/AvahiNetworkService.cxx | 209 +++++++++++++++++++++ 1 file changed, 209 insertions(+) create mode 100644 sd/source/ui/remotecontrol/AvahiNetworkService.cxx (limited to 'sd/source/ui/remotecontrol/AvahiNetworkService.cxx') diff --git a/sd/source/ui/remotecontrol/AvahiNetworkService.cxx b/sd/source/ui/remotecontrol/AvahiNetworkService.cxx new file mode 100644 index 000000000..7708e6eb7 --- /dev/null +++ b/sd/source/ui/remotecontrol/AvahiNetworkService.cxx @@ -0,0 +1,209 @@ +/* -*- 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 + +#include +#include +#include +#include + +#include +#include + +#include +#include +#include +#include + +#if ENABLE_DBUS +#include +#endif + +#include + +#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::max()); + snprintf(r, sizeof(r), "random=%i", nRandom); + int ret = avahi_entry_group_add_service( + group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, static_cast(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(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); +} -- cgit v1.2.3