Revert change which removes GICE

webrtc/p2p/base/p2ptransportchannel.cc

Index: webrtc/p2p/base/p2ptransportchannel.cc
diff --git a/webrtc/p2p/base/p2ptransportchannel.cc b/webrtc/p2p/base/p2ptransportchannel.cc
index 094a8dcc8f1ffc937a436dc85890633c62d60760..51f4736e24cf4311d5ed6eb43ad6fe0618ad6c98 100644
--- a/webrtc/p2p/base/p2ptransportchannel.cc
+++ b/webrtc/p2p/base/p2ptransportchannel.cc
@@ -124,6 +124,14 @@ class ConnectionCompare {
     cricket::Connection* a = const_cast<cricket::Connection*>(ca);
     cricket::Connection* b = const_cast<cricket::Connection*>(cb);
 
+    // The IceProtocol is initialized to ICEPROTO_HYBRID and can be updated to
+    // GICE or RFC5245 when an answer SDP is set, or when a STUN message is
+    // received. So the port receiving the STUN message may have a different
+    // IceProtocol if the answer SDP is not set yet.
+    ASSERT(a->port()->IceProtocol() == b->port()->IceProtocol() ||
+           a->port()->IceProtocol() == cricket::ICEPROTO_HYBRID ||
+           b->port()->IceProtocol() == cricket::ICEPROTO_HYBRID);
+
     // Compare first on writability and static preferences.
     int cmp = CompareConnections(a, b);
     if (cmp > 0)
@@ -184,6 +192,7 @@ P2PTransportChannel::P2PTransportChannel(const std::string& content_name,
     pending_best_connection_(NULL),
     sort_dirty_(false),
     was_writable_(false),
+    protocol_type_(ICEPROTO_HYBRID),
     remote_ice_mode_(ICEMODE_FULL),
     ice_role_(ICEROLE_UNKNOWN),
     tiebreaker_(0),
@@ -284,6 +293,21 @@ TransportChannelState P2PTransportChannel::GetState() const {
   return TransportChannelState::STATE_COMPLETED;
 }
 
+bool P2PTransportChannel::GetIceProtocolType(IceProtocolType* type) const {
+  *type = protocol_type_;
+  return true;
+}
+
+void P2PTransportChannel::SetIceProtocolType(IceProtocolType type) {
+  ASSERT(worker_thread_ == rtc::Thread::Current());
+
+  protocol_type_ = type;
+  for (std::vector<PortInterface *>::iterator it = ports_.begin();
+       it != ports_.end(); ++it) {
+    (*it)->SetIceProtocolType(protocol_type_);
+  }
+}
+
 void P2PTransportChannel::SetIceCredentials(const std::string& ice_ufrag,
                                             const std::string& ice_pwd) {
   ASSERT(worker_thread_ == rtc::Thread::Current());
@@ -323,8 +347,9 @@ void P2PTransportChannel::SetRemoteIceCredentials(const std::string& ice_ufrag,
   }
 
   if (ice_restart) {
-    // We need to keep track of the remote ice restart so newer
-    // connections are prioritized over the older.
+    // |candidate.generation()| is not signaled in ICEPROTO_RFC5245.
+    // Therefore we need to keep track of the remote ice restart so
+    // newer connections are prioritized over the older.
     ++remote_candidate_generation_;
   }
 }
@@ -385,6 +410,7 @@ void P2PTransportChannel::OnPortReady(PortAllocatorSession *session,
   // The session will handle this, and send an initiate/accept/modify message
   // if one is pending.
 
+  port->SetIceProtocolType(protocol_type_);
   port->SetIceRole(ice_role_);
   port->SetIceTiebreaker(tiebreaker_);
   ports_.push_back(port);
@@ -479,30 +505,46 @@ void P2PTransportChannel::OnUnknownAddress(
     }
   } else {
     // Create a new candidate with this address.
+    std::string type;
     int remote_candidate_priority;
-
-    // The priority of the candidate is set to the PRIORITY attribute
-    // from the request.
-    const StunUInt32Attribute* priority_attr =
-        stun_msg->GetUInt32(STUN_ATTR_PRIORITY);
-    if (!priority_attr) {
-      LOG(LS_WARNING) << "P2PTransportChannel::OnUnknownAddress - "
-                      << "No STUN_ATTR_PRIORITY found in the "
-                      << "stun request message";
-      port->SendBindingErrorResponse(stun_msg, address,
-                                     STUN_ERROR_BAD_REQUEST,
-                                     STUN_ERROR_REASON_BAD_REQUEST);
-      return;
+    if (port->IceProtocol() == ICEPROTO_RFC5245) {
+      // RFC 5245
+      // If the source transport address of the request does not match any
+      // existing remote candidates, it represents a new peer reflexive remote
+      // candidate.
+      type = PRFLX_PORT_TYPE;
+
+      // The priority of the candidate is set to the PRIORITY attribute
+      // from the request.
+      const StunUInt32Attribute* priority_attr =
+          stun_msg->GetUInt32(STUN_ATTR_PRIORITY);
+      if (!priority_attr) {
+        LOG(LS_WARNING) << "P2PTransportChannel::OnUnknownAddress - "
+                        << "No STUN_ATTR_PRIORITY found in the "
+                        << "stun request message";
+        port->SendBindingErrorResponse(stun_msg, address,
+                                       STUN_ERROR_BAD_REQUEST,
+                                       STUN_ERROR_REASON_BAD_REQUEST);
+        return;
+      }
+      remote_candidate_priority = priority_attr->value();
+    } else {
+      // G-ICE doesn't support prflx candidate.
+      // We set candidate type to STUN_PORT_TYPE if the binding request comes
+      // from a relay port or the shared socket is used. Otherwise we use the
+      // port's type as the candidate type.
+      if (port->Type() == RELAY_PORT_TYPE || port->SharedSocket()) {
+        type = STUN_PORT_TYPE;
+      } else {
+        type = port->Type();
+      }
+      remote_candidate_priority = remote_candidate.GetPriority(
+          ICE_TYPE_PREFERENCE_PRFLX, port->Network()->preference(), 0);
     }
-    remote_candidate_priority = priority_attr->value();
 
-    // RFC 5245
-    // If the source transport address of the request does not match any
-    // existing remote candidates, it represents a new peer reflexive remote
-    // candidate.
     remote_candidate =
         Candidate(component(), ProtoToString(proto), address, 0,
-                  remote_username, remote_password, PRFLX_PORT_TYPE, 0U, "");
+                  remote_username, remote_password, type, 0U, "");
 
     // From RFC 5245, section-7.2.1.3:
     // The foundation of the candidate is set to an arbitrary value, different
@@ -513,56 +555,81 @@ void P2PTransportChannel::OnUnknownAddress(
     remote_candidate.set_priority(remote_candidate_priority);
   }
 
-  // RFC5245, the agent constructs a pair whose local candidate is equal to
-  // the transport address on which the STUN request was received, and a
-  // remote candidate equal to the source transport address where the
-  // request came from.
+  if (port->IceProtocol() == ICEPROTO_RFC5245) {
+    // RFC5245, the agent constructs a pair whose local candidate is equal to
+    // the transport address on which the STUN request was received, and a
+    // remote candidate equal to the source transport address where the
+    // request came from.
+
+    // There shouldn't be an existing connection with this remote address.
+    // When ports are muxed, this channel might get multiple unknown address
+    // signals. In that case if the connection is already exists, we should
+    // simply ignore the signal otherwise send server error.
+    if (port->GetConnection(remote_candidate.address())) {
+      if (port_muxed) {
+        LOG(LS_INFO) << "Connection already exists for peer reflexive "
+                     << "candidate: " << remote_candidate.ToString();
+        return;
+      } else {
+        ASSERT(false);
+        port->SendBindingErrorResponse(stun_msg, address,
+                                       STUN_ERROR_SERVER_ERROR,
+                                       STUN_ERROR_REASON_SERVER_ERROR);
+        return;
+      }
+    }
 
-  // There shouldn't be an existing connection with this remote address.
-  // When ports are muxed, this channel might get multiple unknown address
-  // signals. In that case if the connection is already exists, we should
-  // simply ignore the signal otherwise send server error.
-  if (port->GetConnection(remote_candidate.address())) {
-    if (port_muxed) {
-      LOG(LS_INFO) << "Connection already exists for peer reflexive "
-                   << "candidate: " << remote_candidate.ToString();
-      return;
-    } else {
+    Connection* connection = port->CreateConnection(
+        remote_candidate, cricket::PortInterface::ORIGIN_THIS_PORT);
+    if (!connection) {
       ASSERT(false);
       port->SendBindingErrorResponse(stun_msg, address,
                                      STUN_ERROR_SERVER_ERROR,
                                      STUN_ERROR_REASON_SERVER_ERROR);
       return;
     }
-  }
 
-  Connection* connection = port->CreateConnection(
-      remote_candidate, cricket::PortInterface::ORIGIN_THIS_PORT);
-  if (!connection) {
-    ASSERT(false);
-    port->SendBindingErrorResponse(stun_msg, address,
-                                   STUN_ERROR_SERVER_ERROR,
-                                   STUN_ERROR_REASON_SERVER_ERROR);
-    return;
-  }
+    LOG(LS_INFO) << "Adding connection from "
+                 << (remote_candidate_is_new ? "peer reflexive" : "resurrected")
+                 << " candidate: " << remote_candidate.ToString();
+    AddConnection(connection);
+    connection->ReceivedPing();
 
-  LOG(LS_INFO) << "Adding connection from "
-               << (remote_candidate_is_new ? "peer reflexive" : "resurrected")
-               << " candidate: " << remote_candidate.ToString();
-  AddConnection(connection);
-  connection->ReceivedPing();
+    // Send the pinger a successful stun response.
+    port->SendBindingResponse(stun_msg, address);
 
-  bool received_use_candidate =
-      stun_msg->GetByteString(STUN_ATTR_USE_CANDIDATE) != nullptr;
-  if (received_use_candidate && ice_role_ == ICEROLE_CONTROLLED) {
-    connection->set_nominated(true);
-    OnNominated(connection);
-  }
+    bool received_use_candidate =
+        stun_msg->GetByteString(STUN_ATTR_USE_CANDIDATE) != nullptr;
+    if (received_use_candidate && ice_role_ == ICEROLE_CONTROLLED) {
+      connection->set_nominated(true);
+      OnNominated(connection);
+    }
 
-  // Update the list of connections since we just added another.  We do this
-  // after sending the response since it could (in principle) delete the
-  // connection in question.
-  SortConnections();
+    // Update the list of connections since we just added another.  We do this
+    // after sending the response since it could (in principle) delete the
+    // connection in question.
+    SortConnections();
+  } else {
+    // Check for connectivity to this address. Create connections
+    // to this address across all local ports. First, add this as a new remote
+    // address
+    if (!CreateConnections(remote_candidate, port, true)) {
+      // Hopefully this won't occur, because changing a destination address
+      // shouldn't cause a new connection to fail
+      ASSERT(false);
+      port->SendBindingErrorResponse(stun_msg, address, STUN_ERROR_SERVER_ERROR,
+          STUN_ERROR_REASON_SERVER_ERROR);
+      return;
+    }
+
+    // Send the pinger a successful stun response.
+    port->SendBindingResponse(stun_msg, address);
+
+    // Update the list of connections since we just added another.  We do this
+    // after sending the response since it could (in principle) delete the
+    // connection in question.
+    SortConnections();
+  }
 }
 
 void P2PTransportChannel::OnRoleConflict(PortInterface* port) {
@@ -583,6 +650,7 @@ void P2PTransportChannel::OnSignalingReady() {
 void P2PTransportChannel::OnNominated(Connection* conn) {
   ASSERT(worker_thread_ == rtc::Thread::Current());
   ASSERT(ice_role_ == ICEROLE_CONTROLLED);
+  ASSERT(protocol_type_ == ICEPROTO_RFC5245);
 
   if (conn->write_state() == Connection::STATE_WRITABLE) {
     if (best_connection_ != conn) {
@@ -741,8 +809,13 @@ bool P2PTransportChannel::FindConnection(
 
 uint32 P2PTransportChannel::GetRemoteCandidateGeneration(
     const Candidate& candidate) {
-  // We need to keep track of the remote ice restart so newer
-  // connections are prioritized over the older.
+  if (protocol_type_ == ICEPROTO_GOOGLE) {
+    // The Candidate.generation() can be trusted. Nothing needs to be done.
+    return candidate.generation();
+  }
+  // |candidate.generation()| is not signaled in ICEPROTO_RFC5245.
+  // Therefore we need to keep track of the remote ice restart so
+  // newer connections are prioritized over the older.
   ASSERT(candidate.generation() == 0 ||
          candidate.generation() == remote_candidate_generation_);
   return remote_candidate_generation_;
@@ -920,6 +993,15 @@ void P2PTransportChannel::SortConnections() {
   // will be sorted.
   UpdateConnectionStates();
 
+  if (protocol_type_ == ICEPROTO_HYBRID) {
+    // If we are in hybrid mode, we are not sending any ping requests, so there
+    // is no point in sorting the connections. In hybrid state, ports can have
+    // different protocol than hybrid and protocol may differ from one another.
+    // Instead just update the state of this channel
+    UpdateChannelState();
+    return;
+  }
+
   // Any changes after this point will require a re-sort.
   sort_dirty_ = false;
 
@@ -942,7 +1024,10 @@ void P2PTransportChannel::SortConnections() {
   // connection although it will have higher priority if it is writable.
   // The controlled side can switch the best connection only if the current
   // |best connection_| has not been nominated by the controlling side yet.
-  if ((ice_role_ == ICEROLE_CONTROLLING || !best_nominated_connection()) &&
+
+  // We don't want to pick the best connections if channel is using RFC5245.
+  if ((protocol_type_ != ICEPROTO_RFC5245 || ice_role_ == ICEROLE_CONTROLLING ||
+      !best_nominated_connection()) &&
       ShouldSwitch(best_connection_, top_connection)) {
     LOG(LS_INFO) << "Switching best connection: " << top_connection->ToString();
     SwitchBestConnectionTo(top_connection);
@@ -951,7 +1036,8 @@ void P2PTransportChannel::SortConnections() {
   // Controlled side can prune only if the best connection has been nominated.
   // because otherwise it may delete the connection that will be selected by
   // the controlling side.
-  if (ice_role_ == ICEROLE_CONTROLLING || best_nominated_connection()) {
+  if (protocol_type_ != ICEPROTO_RFC5245 || ice_role_ == ICEROLE_CONTROLLING ||
+      best_nominated_connection()) {
     PruneConnections();
   }
 
@@ -1216,7 +1302,8 @@ Connection* P2PTransportChannel::FindNextPingableConnection() {
       continue;
     }
     bool needs_triggered_check =
-        (!conn->writable() &&
+        (protocol_type_ == ICEPROTO_RFC5245 &&
+         !conn->writable() &&
          conn->last_ping_received() > conn->last_ping_sent());
     if (needs_triggered_check &&
         (!oldest_needing_triggered_check ||
@@ -1251,13 +1338,15 @@ Connection* P2PTransportChannel::FindNextPingableConnection() {
 //      b.2) |conn| is writable.
 void P2PTransportChannel::PingConnection(Connection* conn) {
   bool use_candidate = false;
-  if (remote_ice_mode_ == ICEMODE_FULL && ice_role_ == ICEROLE_CONTROLLING) {
-    use_candidate = (conn == best_connection_) ||
-                    (best_connection_ == NULL) ||
-                    (!best_connection_->writable()) ||
-                    (conn->priority() > best_connection_->priority());
-  } else if (remote_ice_mode_ == ICEMODE_LITE && conn == best_connection_) {
-    use_candidate = best_connection_->writable();
+  if (protocol_type_ == ICEPROTO_RFC5245) {
+    if (remote_ice_mode_ == ICEMODE_FULL && ice_role_ == ICEROLE_CONTROLLING) {
+      use_candidate = (conn == best_connection_) ||
+                      (best_connection_ == NULL) ||
+                      (!best_connection_->writable()) ||
+                      (conn->priority() > best_connection_->priority());
+    } else if (remote_ice_mode_ == ICEMODE_LITE && conn == best_connection_) {
+      use_candidate = best_connection_->writable();
+    }
   }
   conn->set_use_candidate_attr(use_candidate);
   conn->Ping(rtc::Time());
@@ -1270,7 +1359,7 @@ void P2PTransportChannel::OnConnectionStateChange(Connection* connection) {
 
   // Update the best connection if the state change is from pending best
   // connection and role is controlled.
-  if (ice_role_ == ICEROLE_CONTROLLED) {
+  if (protocol_type_ == ICEPROTO_RFC5245 && ice_role_ == ICEROLE_CONTROLLED) {
     if (connection == pending_best_connection_ && connection->writable()) {
       pending_best_connection_ = NULL;
       LOG(LS_INFO) << "Switching best connection on controlled side"