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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/protocol/pepper_stream_channel.h"
#include "base/bind.h"
#include "crypto/hmac.h"
#include "jingle/glue/utils.h"
#include "net/base/cert_status_flags.h"
#include "net/base/cert_verifier.h"
#include "net/base/host_port_pair.h"
#include "net/base/ssl_config_service.h"
#include "net/socket/ssl_client_socket.h"
#include "net/socket/client_socket_factory.h"
#include "ppapi/c/pp_errors.h"
#include "ppapi/cpp/dev/transport_dev.h"
#include "ppapi/cpp/var.h"
#include "remoting/protocol/channel_authenticator.h"
#include "remoting/protocol/pepper_session.h"
#include "remoting/protocol/transport_config.h"
#include "third_party/libjingle/source/talk/p2p/base/candidate.h"
namespace remoting {
namespace protocol {
namespace {
// Value is choosen to balance the extra latency against the reduced
// load due to ACK traffic.
const int kTcpAckDelayMilliseconds = 10;
// Values for the TCP send and receive buffer size. This should be tuned to
// accomodate high latency network but not backlog the decoding pipeline.
const int kTcpReceiveBufferSize = 256 * 1024;
const int kTcpSendBufferSize = kTcpReceiveBufferSize + 30 * 1024;
} // namespace
PepperStreamChannel::PepperStreamChannel(
PepperSession* session,
const std::string& name,
const Session::StreamChannelCallback& callback)
: session_(session),
name_(name),
callback_(callback),
channel_(NULL),
connected_(false),
ALLOW_THIS_IN_INITIALIZER_LIST(p2p_connect_callback_(
this, &PepperStreamChannel::OnP2PConnect)) {
}
PepperStreamChannel::~PepperStreamChannel() {
session_->OnDeleteChannel(this);
// Verify that the |channel_| is ether destroyed or we own it.
DCHECK_EQ(channel_, owned_channel_.get());
// Channel should be already destroyed if we were connected.
DCHECK(!connected_ || channel_ == NULL);
}
void PepperStreamChannel::Connect(pp::Instance* pp_instance,
const TransportConfig& transport_config,
ChannelAuthenticator* authenticator) {
DCHECK(CalledOnValidThread());
authenticator_.reset(authenticator);
pp::Transport_Dev* transport =
new pp::Transport_Dev(pp_instance, name_.c_str(),
PP_TRANSPORTTYPE_STREAM);
if (transport->SetProperty(PP_TRANSPORTPROPERTY_TCP_RECEIVE_WINDOW,
pp::Var(kTcpReceiveBufferSize)) != PP_OK) {
LOG(ERROR) << "Failed to set TCP receive window";
}
if (transport->SetProperty(PP_TRANSPORTPROPERTY_TCP_SEND_WINDOW,
pp::Var(kTcpSendBufferSize)) != PP_OK) {
LOG(ERROR) << "Failed to set TCP send window";
}
if (transport->SetProperty(PP_TRANSPORTPROPERTY_TCP_NO_DELAY,
pp::Var(true)) != PP_OK) {
LOG(ERROR) << "Failed to set TCP_NODELAY";
}
if (transport->SetProperty(PP_TRANSPORTPROPERTY_TCP_ACK_DELAY,
pp::Var(kTcpAckDelayMilliseconds)) != PP_OK) {
LOG(ERROR) << "Failed to set TCP ACK delay.";
}
if (transport_config.nat_traversal) {
if (transport->SetProperty(
PP_TRANSPORTPROPERTY_STUN_SERVER,
pp::Var(transport_config.stun_server)) != PP_OK) {
LOG(ERROR) << "Failed to set STUN server.";
}
if (transport->SetProperty(
PP_TRANSPORTPROPERTY_RELAY_SERVER,
pp::Var(transport_config.relay_server)) != PP_OK) {
LOG(ERROR) << "Failed to set relay server.";
}
if (transport->SetProperty(
PP_TRANSPORTPROPERTY_RELAY_PASSWORD,
pp::Var(transport_config.relay_token)) != PP_OK) {
LOG(ERROR) << "Failed to set relay token.";
}
if (transport->SetProperty(
PP_TRANSPORTPROPERTY_RELAY_MODE,
pp::Var(PP_TRANSPORTRELAYMODE_GOOGLE)) != PP_OK) {
LOG(ERROR) << "Failed to set relay mode.";
}
}
if (transport->SetProperty(PP_TRANSPORTPROPERTY_DISABLE_TCP_TRANSPORT,
pp::Var(true)) != PP_OK) {
LOG(ERROR) << "Failed to set DISABLE_TCP_TRANSPORT flag.";
}
channel_ = new PepperTransportSocketAdapter(transport, name_, this);
owned_channel_.reset(channel_);
int result = channel_->Connect(&p2p_connect_callback_);
if (result != net::ERR_IO_PENDING)
OnP2PConnect(result);
}
void PepperStreamChannel::AddRemoveCandidate(
const cricket::Candidate& candidate) {
DCHECK(CalledOnValidThread());
if (channel_)
channel_->AddRemoteCandidate(jingle_glue::SerializeP2PCandidate(candidate));
}
const std::string& PepperStreamChannel::name() const {
DCHECK(CalledOnValidThread());
return name_;
}
bool PepperStreamChannel::is_connected() const {
DCHECK(CalledOnValidThread());
return connected_;
}
void PepperStreamChannel::OnChannelDeleted() {
if (connected_) {
channel_ = NULL;
// The PepperTransportSocketAdapter is being deleted, so delete
// the channel too.
delete this;
}
}
void PepperStreamChannel::OnChannelNewLocalCandidate(
const std::string& candidate) {
DCHECK(CalledOnValidThread());
cricket::Candidate candidate_value;
if (!jingle_glue::DeserializeP2PCandidate(candidate, &candidate_value)) {
LOG(ERROR) << "Failed to parse candidate " << candidate;
}
session_->AddLocalCandidate(candidate_value);
}
void PepperStreamChannel::OnP2PConnect(int result) {
DCHECK(CalledOnValidThread());
if (result != net::OK)
NotifyConnectFailed();
authenticator_->SecureAndAuthenticate(owned_channel_.release(), base::Bind(
&PepperStreamChannel::OnAuthenticationDone, base::Unretained(this)));
}
void PepperStreamChannel::OnAuthenticationDone(
net::Error error, net::StreamSocket* socket) {
DCHECK(CalledOnValidThread());
if (error != net::OK) {
NotifyConnectFailed();
return;
}
NotifyConnected(socket);
}
void PepperStreamChannel::NotifyConnected(net::StreamSocket* socket) {
DCHECK(!connected_);
callback_.Run(socket);
connected_ = true;
}
void PepperStreamChannel::NotifyConnectFailed() {
channel_ = NULL;
owned_channel_.reset();
authenticator_.reset();
NotifyConnected(NULL);
}
} // namespace protocol
} // namespace remoting
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