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// Copyright 2016 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/port_allocator.h"
#include <algorithm>
#include <map>
#include "base/bind.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "net/base/escape.h"
#include "net/http/http_status_code.h"
#include "remoting/protocol/network_settings.h"
#include "remoting/protocol/transport_context.h"
namespace {
typedef std::map<std::string, std::string> StringMap;
// Parses the lines in the result of the HTTP request that are of the form
// 'a=b' and returns them in a map.
StringMap ParseMap(const std::string& string) {
StringMap map;
base::StringPairs pairs;
base::SplitStringIntoKeyValuePairs(string, '=', '\n', &pairs);
for (auto& pair : pairs) {
map[pair.first] = pair.second;
}
return map;
}
const int kNumRetries = 5;
} // namespace
namespace remoting {
namespace protocol {
PortAllocator::PortAllocator(
scoped_ptr<rtc::NetworkManager> network_manager,
scoped_ptr<rtc::PacketSocketFactory> socket_factory,
scoped_refptr<TransportContext> transport_context)
: BasicPortAllocator(network_manager.get(), socket_factory.get()),
network_manager_(std::move(network_manager)),
socket_factory_(std::move(socket_factory)),
transport_context_(transport_context) {
// We always use PseudoTcp to provide a reliable channel. It provides poor
// performance when combined with TCP-based transport, so we have to disable
// TCP ports. ENABLE_SHARED_UFRAG flag is specified so that the same username
// fragment is shared between all candidates.
int flags = cricket::PORTALLOCATOR_DISABLE_TCP |
cricket::PORTALLOCATOR_ENABLE_SHARED_UFRAG |
cricket::PORTALLOCATOR_ENABLE_IPV6;
NetworkSettings network_settings = transport_context_->network_settings();
if (!(network_settings.flags & NetworkSettings::NAT_TRAVERSAL_STUN))
flags |= cricket::PORTALLOCATOR_DISABLE_STUN;
if (!(network_settings.flags & NetworkSettings::NAT_TRAVERSAL_RELAY))
flags |= cricket::PORTALLOCATOR_DISABLE_RELAY;
set_flags(flags);
SetPortRange(network_settings.port_range.min_port,
network_settings.port_range.max_port);
}
PortAllocator::~PortAllocator() {}
cricket::PortAllocatorSession* PortAllocator::CreateSessionInternal(
const std::string& content_name,
int component,
const std::string& ice_username_fragment,
const std::string& ice_password) {
return new PortAllocatorSession(this, content_name, component,
ice_username_fragment, ice_password);
}
PortAllocatorSession::PortAllocatorSession(PortAllocator* allocator,
const std::string& content_name,
int component,
const std::string& ice_ufrag,
const std::string& ice_pwd)
: BasicPortAllocatorSession(allocator,
content_name,
component,
ice_ufrag,
ice_pwd),
transport_context_(allocator->transport_context()),
weak_factory_(this) {}
PortAllocatorSession::~PortAllocatorSession() {}
void PortAllocatorSession::GetPortConfigurations() {
transport_context_->GetIceConfig(base::Bind(
&PortAllocatorSession::OnIceConfig, weak_factory_.GetWeakPtr()));
}
void PortAllocatorSession::OnIceConfig(const IceConfig& ice_config) {
ice_config_ = ice_config;
ConfigReady(GetPortConfiguration().release());
if (relay_enabled() && !ice_config_.relay_servers.empty() &&
!ice_config_.relay_token.empty()) {
TryCreateRelaySession();
}
}
scoped_ptr<cricket::PortConfiguration>
PortAllocatorSession::GetPortConfiguration() {
cricket::ServerAddresses stun_servers;
for (const auto& host : ice_config_.stun_servers) {
stun_servers.insert(host);
}
scoped_ptr<cricket::PortConfiguration> config(
new cricket::PortConfiguration(stun_servers, username(), password()));
if (relay_enabled()) {
for (const auto& turn_server : ice_config_.turn_servers) {
config->AddRelay(turn_server);
}
}
return config;
}
void PortAllocatorSession::TryCreateRelaySession() {
DCHECK(!ice_config_.relay_servers.empty());
DCHECK(!ice_config_.relay_token.empty());
if (attempts_ == kNumRetries) {
LOG(ERROR) << "PortAllocator: maximum number of requests reached; "
<< "giving up on relay.";
return;
}
// Choose the next host to try.
std::string host =
ice_config_.relay_servers[attempts_ % ice_config_.relay_servers.size()];
attempts_++;
DCHECK(!username().empty());
DCHECK(!password().empty());
std::string url = "https://" + host + "/create_session?username=" +
net::EscapeUrlEncodedData(username(), false) +
"&password=" +
net::EscapeUrlEncodedData(password(), false) + "&sn=1";
scoped_ptr<UrlRequest> url_request =
transport_context_->url_request_factory()->CreateUrlRequest(
UrlRequest::Type::GET, url);
url_request->AddHeader("X-Talk-Google-Relay-Auth: " +
ice_config_.relay_token);
url_request->AddHeader("X-Google-Relay-Auth: " + ice_config_.relay_token);
url_request->AddHeader("X-Stream-Type: chromoting");
url_request->Start(base::Bind(&PortAllocatorSession::OnSessionRequestResult,
base::Unretained(this)));
url_requests_.insert(std::move(url_request));
}
void PortAllocatorSession::OnSessionRequestResult(
const UrlRequest::Result& result) {
if (!result.success || result.status != net::HTTP_OK) {
LOG(WARNING) << "Received error when allocating relay session: "
<< result.status;
TryCreateRelaySession();
return;
}
StringMap map = ParseMap(result.response_body);
if (!username().empty() && map["username"] != username()) {
LOG(WARNING) << "Received unexpected username value from relay server.";
}
if (!password().empty() && map["password"] != password()) {
LOG(WARNING) << "Received unexpected password value from relay server.";
}
scoped_ptr<cricket::PortConfiguration> config = GetPortConfiguration();
std::string relay_ip = map["relay.ip"];
std::string relay_port = map["relay.udp_port"];
unsigned relay_port_int;
if (!relay_ip.empty() && !relay_port.empty() &&
base::StringToUint(relay_port, &relay_port_int)) {
cricket::RelayServerConfig relay_config(cricket::RELAY_GTURN);
rtc::SocketAddress address(relay_ip, relay_port_int);
relay_config.ports.push_back(
cricket::ProtocolAddress(address, cricket::PROTO_UDP));
config->AddRelay(relay_config);
}
ConfigReady(config.release());
}
} // namespace protocol
} // namespace remoting
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