| // 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) { |
| const base::DictionaryValue* server_dict; |
| if (!server.GetAsDictionary(&server_dict)) { |
| errors_found = true; |
| continue; |
| } |
| |
| const 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 |