remoting/protocol/chromium_port_allocator.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "remoting/protocol/chromium_port_allocator.h"
   6
   7 #include "base/bind.h"
   8 #include "base/stl_util.h"
   9 #include "base/strings/string_number_conversions.h"
  10 #include "net/http/http_status_code.h"
  11 #include "net/url_request/url_fetcher.h"
  12 #include "net/url_request/url_fetcher_delegate.h"
  13 #include "net/url_request/url_request_context_getter.h"
  14 #include "remoting/protocol/chromium_socket_factory.h"
  15 #include "remoting/protocol/network_settings.h"
  16 #include "url/gurl.h"
  17
  18 namespace remoting {
  19 namespace protocol {
  20
  21 namespace {
  22
  23 class ChromiumPortAllocatorSession
  24     : public cricket::HttpPortAllocatorSessionBase,
  25       public net::URLFetcherDelegate {
  26  public:
  27   ChromiumPortAllocatorSession(
  28       cricket::HttpPortAllocatorBase* allocator,
  29       const std::string& content_name,
  30       int component,
  31       const std::string& ice_username_fragment,
  32       const std::string& ice_password,
  33       const std::vector<rtc::SocketAddress>& stun_hosts,
  34       const std::vector<std::string>& relay_hosts,
  35       const std::string& relay,
  36       const scoped_refptr<net::URLRequestContextGetter>& url_context);
  37   ~ChromiumPortAllocatorSession() override;
  38
  39   // cricket::HttpPortAllocatorBase overrides.
  40   void ConfigReady(cricket::PortConfiguration* config) override;
  41   void SendSessionRequest(const std::string& host, int port) override;
  42
  43   // net::URLFetcherDelegate interface.
  44   void OnURLFetchComplete(const net::URLFetcher* url_fetcher) override;
  45
  46  private:
  47   scoped_refptr<net::URLRequestContextGetter> url_context_;
  48   std::set<const net::URLFetcher*> url_fetchers_;
  49
  50   DISALLOW_COPY_AND_ASSIGN(ChromiumPortAllocatorSession);
  51 };
  52
  53 ChromiumPortAllocatorSession::ChromiumPortAllocatorSession(
  54     cricket::HttpPortAllocatorBase* allocator,
  55     const std::string& content_name,
  56     int component,
  57     const std::string& ice_username_fragment,
  58     const std::string& ice_password,
  59     const std::vector<rtc::SocketAddress>& stun_hosts,
  60     const std::vector<std::string>& relay_hosts,
  61     const std::string& relay,
  62     const scoped_refptr<net::URLRequestContextGetter>& url_context)
  63     : HttpPortAllocatorSessionBase(allocator,
  64                                    content_name,
  65                                    component,
  66                                    ice_username_fragment,
  67                                    ice_password,
  68                                    stun_hosts,
  69                                    relay_hosts,
  70                                    relay,
  71                                    std::string()),
  72       url_context_(url_context) {}
  73
  74 ChromiumPortAllocatorSession::~ChromiumPortAllocatorSession() {
  75   STLDeleteElements(&url_fetchers_);
  76 }
  77
  78 void ChromiumPortAllocatorSession::ConfigReady(
  79     cricket::PortConfiguration* config) {
  80   // Filter out non-UDP relay ports, so that we don't try using TCP.
  81   for (cricket::PortConfiguration::RelayList::iterator relay =
  82            config->relays.begin(); relay != config->relays.end(); ++relay) {
  83     cricket::PortList filtered_ports;
  84     for (cricket::PortList::iterator port =
  85              relay->ports.begin(); port != relay->ports.end(); ++port) {
  86       if (port->proto == cricket::PROTO_UDP) {
  87         filtered_ports.push_back(*port);
  88       }
  89     }
  90     relay->ports = filtered_ports;
  91   }
  92   cricket::BasicPortAllocatorSession::ConfigReady(config);
  93 }
  94
  95 void ChromiumPortAllocatorSession::SendSessionRequest(
  96     const std::string& host,
  97     int port) {
  98   GURL url("https://" + host + ":" + base::IntToString(port) +
  99            GetSessionRequestUrl() + "&sn=1");
 100   scoped_ptr<net::URLFetcher> url_fetcher(
 101       net::URLFetcher::Create(url, net::URLFetcher::GET, this));
 102   url_fetcher->SetRequestContext(url_context_.get());
 103   url_fetcher->AddExtraRequestHeader("X-Talk-Google-Relay-Auth: " +
 104                                      relay_token());
 105   url_fetcher->AddExtraRequestHeader("X-Google-Relay-Auth: " + relay_token());
 106   url_fetcher->AddExtraRequestHeader("X-Stream-Type: chromoting");
 107   url_fetcher->Start();
 108   url_fetchers_.insert(url_fetcher.release());
 109 }
 110
 111 void ChromiumPortAllocatorSession::OnURLFetchComplete(
 112     const net::URLFetcher* source) {
 113   int response_code = source->GetResponseCode();
 114   std::string response;
 115   source->GetResponseAsString(&response);
 116
 117   url_fetchers_.erase(source);
 118   delete source;
 119
 120   if (response_code != net::HTTP_OK) {
 121     LOG(WARNING) << "Received error when allocating relay session: "
 122                  << response_code;
 123     TryCreateRelaySession();
 124     return;
 125   }
 126
 127   ReceiveSessionResponse(response);
 128 }
 129
 130 }  // namespace
 131
 132 // static
 133 scoped_ptr<ChromiumPortAllocator> ChromiumPortAllocator::Create(
 134     const scoped_refptr<net::URLRequestContextGetter>& url_context,
 135     const NetworkSettings& network_settings) {
 136   scoped_ptr<rtc::NetworkManager> network_manager(
 137       new rtc::BasicNetworkManager());
 138   scoped_ptr<rtc::PacketSocketFactory> socket_factory(
 139       new ChromiumPacketSocketFactory());
 140   scoped_ptr<ChromiumPortAllocator> result(
 141       new ChromiumPortAllocator(url_context, network_manager.Pass(),
 142                             socket_factory.Pass()));
 143
 144   // We always use PseudoTcp to provide a reliable channel. It provides poor
 145   // performance when combined with TCP-based transport, so we have to disable
 146   // TCP ports. ENABLE_SHARED_UFRAG flag is specified so that the same username
 147   // fragment is shared between all candidates for this channel.
 148   int flags = cricket::PORTALLOCATOR_DISABLE_TCP |
 149               cricket::PORTALLOCATOR_ENABLE_SHARED_UFRAG |
 150               cricket::PORTALLOCATOR_ENABLE_IPV6;
 151
 152   if (!(network_settings.flags & NetworkSettings::NAT_TRAVERSAL_STUN))
 153     flags |= cricket::PORTALLOCATOR_DISABLE_STUN;
 154
 155   if (!(network_settings.flags & NetworkSettings::NAT_TRAVERSAL_RELAY))
 156     flags |= cricket::PORTALLOCATOR_DISABLE_RELAY;
 157
 158   result->set_flags(flags);
 159   result->SetPortRange(network_settings.port_range.min_port,
 160                        network_settings.port_range.max_port);
 161
 162   return result.Pass();
 163 }
 164
 165 ChromiumPortAllocator::ChromiumPortAllocator(
 166     const scoped_refptr<net::URLRequestContextGetter>& url_context,
 167     scoped_ptr<rtc::NetworkManager> network_manager,
 168     scoped_ptr<rtc::PacketSocketFactory> socket_factory)
 169     : HttpPortAllocatorBase(network_manager.get(),
 170                             socket_factory.get(),
 171                             std::string()),
 172       url_context_(url_context),
 173       network_manager_(network_manager.Pass()),
 174       socket_factory_(socket_factory.Pass()) {}
 175
 176 ChromiumPortAllocator::~ChromiumPortAllocator() {
 177 }
 178
 179 cricket::PortAllocatorSession* ChromiumPortAllocator::CreateSessionInternal(
 180     const std::string& content_name,
 181     int component,
 182     const std::string& ice_username_fragment,
 183     const std::string& ice_password) {
 184   return new ChromiumPortAllocatorSession(
 185       this, content_name, component, ice_username_fragment, ice_password,
 186       stun_hosts(), relay_hosts(), relay_token(), url_context_);
 187 }
 188
 189 }  // namespace protocol
 190 }  // namespace remoting