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-rw-r--r--src/lib/upnp/Discovery.cxx340
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diff --git a/src/lib/upnp/Discovery.cxx b/src/lib/upnp/Discovery.cxx
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+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * 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.
+ */
+
+#include "config.h"
+#include "Discovery.hxx"
+#include "Domain.hxx"
+#include "ContentDirectoryService.hxx"
+#include "system/Clock.hxx"
+#include "Log.hxx"
+
+#include <upnp/upnptools.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+// The service type string we are looking for.
+static constexpr char ContentDirectorySType[] = "urn:schemas-upnp-org:service:ContentDirectory:1";
+
+// We don't include a version in comparisons, as we are satisfied with
+// version 1
+gcc_pure
+static bool
+isCDService(const char *st)
+{
+ constexpr size_t sz = sizeof(ContentDirectorySType) - 3;
+ return memcmp(ContentDirectorySType, st, sz) == 0;
+}
+
+// The type of device we're asking for in search
+static constexpr char MediaServerDType[] = "urn:schemas-upnp-org:device:MediaServer:1";
+
+gcc_pure
+static bool
+isMSDevice(const char *st)
+{
+ constexpr size_t sz = sizeof(MediaServerDType) - 3;
+ return memcmp(MediaServerDType, st, sz) == 0;
+}
+
+static void
+AnnounceFoundUPnP(UPnPDiscoveryListener &listener, const UPnPDevice &device)
+{
+ for (const auto &service : device.services)
+ if (isCDService(service.serviceType.c_str()))
+ listener.FoundUPnP(ContentDirectoryService(device,
+ service));
+}
+
+static void
+AnnounceLostUPnP(UPnPDiscoveryListener &listener, const UPnPDevice &device)
+{
+ for (const auto &service : device.services)
+ if (isCDService(service.serviceType.c_str()))
+ listener.LostUPnP(ContentDirectoryService(device,
+ service));
+}
+
+inline void
+UPnPDeviceDirectory::LockAdd(ContentDirectoryDescriptor &&d)
+{
+ const ScopeLock protect(mutex);
+
+ for (auto &i : directories) {
+ if (i.id == d.id) {
+ i = std::move(d);
+ return;
+ }
+ }
+
+ directories.emplace_back(std::move(d));
+
+ if (listener != nullptr)
+ AnnounceFoundUPnP(*listener, directories.back().device);
+}
+
+inline void
+UPnPDeviceDirectory::LockRemove(const std::string &id)
+{
+ const ScopeLock protect(mutex);
+
+ for (auto i = directories.begin(), end = directories.end();
+ i != end; ++i) {
+ if (i->id == id) {
+ if (listener != nullptr)
+ AnnounceLostUPnP(*listener, i->device);
+
+ directories.erase(i);
+ break;
+ }
+ }
+}
+
+inline void
+UPnPDeviceDirectory::discoExplorer()
+{
+ for (;;) {
+ DiscoveredTask *tsk = 0;
+ if (!discoveredQueue.take(tsk)) {
+ discoveredQueue.workerExit();
+ return;
+ }
+
+ // Device signals its existence and well-being. Perform the
+ // UPnP "description" phase by downloading and decoding the
+ // description document.
+ char *buf;
+ // LINE_SIZE is defined by libupnp's upnp.h...
+ char contentType[LINE_SIZE];
+ int code = UpnpDownloadUrlItem(tsk->url.c_str(), &buf, contentType);
+ if (code != UPNP_E_SUCCESS) {
+ continue;
+ }
+
+ // Update or insert the device
+ ContentDirectoryDescriptor d(std::move(tsk->deviceId),
+ MonotonicClockS(), tsk->expires);
+
+ {
+ Error error2;
+ bool success = d.Parse(tsk->url, buf, error2);
+ free(buf);
+ if (!success) {
+ delete tsk;
+ LogError(error2);
+ continue;
+ }
+ }
+
+ LockAdd(std::move(d));
+ delete tsk;
+ }
+}
+
+void *
+UPnPDeviceDirectory::discoExplorer(void *ctx)
+{
+ UPnPDeviceDirectory &directory = *(UPnPDeviceDirectory *)ctx;
+ directory.discoExplorer();
+ return (void*)1;
+}
+
+inline int
+UPnPDeviceDirectory::OnAlive(Upnp_Discovery *disco)
+{
+ if (isMSDevice(disco->DeviceType) ||
+ isCDService(disco->ServiceType)) {
+ DiscoveredTask *tp = new DiscoveredTask(disco);
+ if (discoveredQueue.put(tp))
+ return UPNP_E_FINISH;
+ }
+
+ return UPNP_E_SUCCESS;
+}
+
+inline int
+UPnPDeviceDirectory::OnByeBye(Upnp_Discovery *disco)
+{
+ if (isMSDevice(disco->DeviceType) ||
+ isCDService(disco->ServiceType)) {
+ // Device signals it is going off.
+ LockRemove(disco->DeviceId);
+ }
+
+ return UPNP_E_SUCCESS;
+}
+
+// This gets called for all libupnp asynchronous events, in a libupnp
+// thread context.
+// Example: ContentDirectories appearing and disappearing from the network
+// We queue a task for our worker thread(s)
+int
+UPnPDeviceDirectory::Invoke(Upnp_EventType et, void *evp)
+{
+ switch (et) {
+ case UPNP_DISCOVERY_SEARCH_RESULT:
+ case UPNP_DISCOVERY_ADVERTISEMENT_ALIVE:
+ {
+ Upnp_Discovery *disco = (Upnp_Discovery *)evp;
+ return OnAlive(disco);
+ }
+
+ case UPNP_DISCOVERY_ADVERTISEMENT_BYEBYE:
+ {
+ Upnp_Discovery *disco = (Upnp_Discovery *)evp;
+ return OnByeBye(disco);
+ }
+
+ default:
+ // Ignore other events for now
+ break;
+ }
+
+ return UPNP_E_SUCCESS;
+}
+
+bool
+UPnPDeviceDirectory::expireDevices(Error &error)
+{
+ const ScopeLock protect(mutex);
+ const unsigned now = MonotonicClockS();
+ bool didsomething = false;
+
+ for (auto it = directories.begin();
+ it != directories.end();) {
+ if (now > it->expires) {
+ it = directories.erase(it);
+ didsomething = true;
+ } else {
+ it++;
+ }
+ }
+
+ if (didsomething)
+ return search(error);
+
+ return true;
+}
+
+UPnPDeviceDirectory::UPnPDeviceDirectory(UpnpClient_Handle _handle,
+ UPnPDiscoveryListener *_listener)
+ :handle(_handle),
+ listener(_listener),
+ discoveredQueue("DiscoveredQueue"),
+ m_searchTimeout(2), m_lastSearch(0)
+{
+}
+
+UPnPDeviceDirectory::~UPnPDeviceDirectory()
+{
+ /* this destructor exists here just so it won't get inlined */
+}
+
+bool
+UPnPDeviceDirectory::Start(Error &error)
+{
+ if (!discoveredQueue.start(1, discoExplorer, this)) {
+ error.Set(upnp_domain, "Discover work queue start failed");
+ return false;
+ }
+
+ return search(error);
+}
+
+bool
+UPnPDeviceDirectory::search(Error &error)
+{
+ const unsigned now = MonotonicClockS();
+ if (now - m_lastSearch < 10)
+ return true;
+ m_lastSearch = now;
+
+ // We search both for device and service just in case.
+ int code = UpnpSearchAsync(handle, m_searchTimeout,
+ ContentDirectorySType, GetUpnpCookie());
+ if (code != UPNP_E_SUCCESS) {
+ error.Format(upnp_domain, code,
+ "UpnpSearchAsync() failed: %s",
+ UpnpGetErrorMessage(code));
+ return false;
+ }
+
+ code = UpnpSearchAsync(handle, m_searchTimeout,
+ MediaServerDType, GetUpnpCookie());
+ if (code != UPNP_E_SUCCESS) {
+ error.Format(upnp_domain, code,
+ "UpnpSearchAsync() failed: %s",
+ UpnpGetErrorMessage(code));
+ return false;
+ }
+
+ return true;
+}
+
+bool
+UPnPDeviceDirectory::getDirServices(std::vector<ContentDirectoryService> &out,
+ Error &error)
+{
+ // Has locking, do it before our own lock
+ if (!expireDevices(error))
+ return false;
+
+ const ScopeLock protect(mutex);
+
+ for (auto dit = directories.begin();
+ dit != directories.end(); dit++) {
+ for (const auto &service : dit->device.services) {
+ if (isCDService(service.serviceType.c_str())) {
+ out.emplace_back(dit->device, service);
+ }
+ }
+ }
+
+ return true;
+}
+
+bool
+UPnPDeviceDirectory::getServer(const char *friendlyName,
+ ContentDirectoryService &server,
+ Error &error)
+{
+ // Has locking, do it before our own lock
+ if (!expireDevices(error))
+ return false;
+
+ const ScopeLock protect(mutex);
+
+ for (const auto &i : directories) {
+ const auto &device = i.device;
+
+ if (device.friendlyName != friendlyName)
+ continue;
+
+ for (const auto &service : device.services) {
+ if (isCDService(service.serviceType.c_str())) {
+ server = ContentDirectoryService(device,
+ service);
+ return true;
+ }
+ }
+ }
+
+ error.Set(upnp_domain, "Server not found");
+ return false;
+}