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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/http_ice_config_request.h"
#include "base/bind.h"
#include "base/callback_helpers.h"
#include "base/json/json_reader.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/values.h"
#include "net/base/url_util.h"
#include "remoting/protocol/ice_config.h"
namespace remoting {
namespace protocol {
namespace {
// Ensure ICE config is correct at least one hour after session starts.
const int kMinimumConfigLifetimeSeconds = 3600;
// See draft-petithuguenin-behave-turn-uris-01.
const int kDefaultStunTurnPort = 3478;
const int kDefaultTurnsPort = 5349;
bool ParseLifetime(const std::string& string, base::TimeDelta* result) {
double seconds = 0;
if (!base::EndsWith(string, "s", base::CompareCase::INSENSITIVE_ASCII) ||
!base::StringToDouble(string.substr(0, string.size() - 1), &seconds)) {
return false;
}
*result = base::TimeDelta::FromSecondsD(seconds);
return true;
}
// Parses url in form of <stun|turn|turns>:<host>[:<port>][?transport=<udp|tcp>]
// and adds an entry to the |config|.
bool AddServerToConfig(std::string url,
const std::string& username,
const std::string& password,
IceConfig* config) {
cricket::ProtocolType turn_transport_type = cricket::PROTO_LAST;
const char kTcpTransportSuffix[] = "?transport=tcp";
const char kUdpTransportSuffix[] = "?transport=udp";
if (base::EndsWith(url, kTcpTransportSuffix,
base::CompareCase::INSENSITIVE_ASCII)) {
turn_transport_type = cricket::PROTO_TCP;
url.resize(url.size() - strlen(kTcpTransportSuffix));
} else if (base::EndsWith(url, kUdpTransportSuffix,
base::CompareCase::INSENSITIVE_ASCII)) {
turn_transport_type = cricket::PROTO_UDP;
url.resize(url.size() - strlen(kUdpTransportSuffix));
}
size_t colon_pos = url.find(':');
if (colon_pos == std::string::npos)
return false;
std::string protocol = url.substr(0, colon_pos);
std::string host;
int port;
if (!net::ParseHostAndPort(url.substr(colon_pos + 1), &host, &port))
return false;
if (protocol == "stun") {
if (port == -1)
port = kDefaultStunTurnPort;
config->stun_servers.push_back(rtc::SocketAddress(host, port));
} else if (protocol == "turn") {
if (port == -1)
port = kDefaultStunTurnPort;
if (turn_transport_type == cricket::PROTO_LAST)
turn_transport_type = cricket::PROTO_UDP;
config->turn_servers.push_back(cricket::RelayServerConfig(
host, port, username, password, turn_transport_type, false));
} else if (protocol == "turns") {
if (port == -1)
port = kDefaultTurnsPort;
if (turn_transport_type == cricket::PROTO_LAST)
turn_transport_type = cricket::PROTO_TCP;
config->turn_servers.push_back(cricket::RelayServerConfig(
host, port, username, password, turn_transport_type, true));
} else {
return false;
}
return true;
}
} // namespace
HttpIceConfigRequest::HttpIceConfigRequest(
UrlRequestFactory* url_request_factory,
const std::string& url)
: url_(url) {
url_request_ =
url_request_factory->CreateUrlRequest(UrlRequest::Type::POST, url_);
url_request_->SetPostData("application/json", "");
}
HttpIceConfigRequest::~HttpIceConfigRequest() {}
void HttpIceConfigRequest::Send(const OnIceConfigCallback& callback) {
DCHECK(on_ice_config_callback_.is_null());
DCHECK(!callback.is_null());
on_ice_config_callback_ = callback;
url_request_->Start(
base::Bind(&HttpIceConfigRequest::OnResponse, base::Unretained(this)));
}
void HttpIceConfigRequest::OnResponse(const UrlRequest::Result& result) {
DCHECK(!on_ice_config_callback_.is_null());
if (!result.success) {
LOG(ERROR) << "Failed to fetch " << url_;
base::ResetAndReturn(&on_ice_config_callback_).Run(IceConfig());
return;
}
if (result.status != 200) {
LOG(ERROR) << "Received status code " << result.status << " from " << url_
<< ": " << result.response_body;
base::ResetAndReturn(&on_ice_config_callback_).Run(IceConfig());
return;
}
std::unique_ptr<base::Value> json =
base::JSONReader::Read(result.response_body);
base::DictionaryValue* dictionary = nullptr;
base::ListValue* ice_servers_list = nullptr;
if (!json || !json->GetAsDictionary(&dictionary) ||
!dictionary->GetList("iceServers", &ice_servers_list)) {
LOG(ERROR) << "Received invalid response from " << url_ << ": "
<< result.response_body;
base::ResetAndReturn(&on_ice_config_callback_).Run(IceConfig());
return;
}
IceConfig ice_config;
// Parse lifetimeDuration field.
std::string lifetime_str;
base::TimeDelta lifetime;
if (!dictionary->GetString("lifetimeDuration", &lifetime_str) ||
!ParseLifetime(lifetime_str, &lifetime)) {
LOG(ERROR) << "Received invalid lifetimeDuration value: " << lifetime_str;
// If the |lifetimeDuration| field is missing or cannot be parsed then mark
// the config as expired so it will refreshed for the next session.
ice_config.expiration_time = base::Time::Now();
} else {
ice_config.expiration_time =
base::Time::Now() + lifetime -
base::TimeDelta::FromSeconds(kMinimumConfigLifetimeSeconds);
}
// Parse iceServers list and store them in |ice_config|.
bool errors_found = false;
for (const auto& server : *ice_servers_list) {
base::DictionaryValue* server_dict;
if (!server->GetAsDictionary(&server_dict)) {
errors_found = true;
continue;
}
base::ListValue* urls_list = nullptr;
if (!server_dict->GetList("urls", &urls_list)) {
errors_found = true;
continue;
}
std::string username;
server_dict->GetString("username", &username);
std::string password;
server_dict->GetString("credential", &password);
for (const auto& url : *urls_list) {
std::string url_str;
if (!url->GetAsString(&url_str)) {
errors_found = true;
continue;
}
if (!AddServerToConfig(url_str, username, password, &ice_config)) {
LOG(ERROR) << "Invalid ICE server URL: " << url_str;
}
}
}
if (errors_found) {
LOG(ERROR) << "Received ICE config from the server that contained errors: "
<< result.response_body;
}
// If there are no STUN or no TURN servers then mark the config as expired so
// it will refreshed for the next session.
if (errors_found || ice_config.stun_servers.empty() ||
ice_config.turn_servers.empty()) {
ice_config.expiration_time = base::Time::Now();
}
base::ResetAndReturn(&on_ice_config_callback_).Run(ice_config);
}
} // namespace protocol
} // namespace remoting
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