1711 lines
60 KiB
C++
1711 lines
60 KiB
C++
/*
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* Copyright 2019 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "p2p/base/connection.h"
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#include <math.h>
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#include <algorithm>
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#include <memory>
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#include <utility>
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#include <vector>
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#include "absl/algorithm/container.h"
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#include "absl/strings/match.h"
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#include "absl/strings/string_view.h"
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#include "p2p/base/port_allocator.h"
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#include "rtc_base/checks.h"
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#include "rtc_base/crc32.h"
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#include "rtc_base/helpers.h"
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#include "rtc_base/logging.h"
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#include "rtc_base/mdns_responder_interface.h"
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#include "rtc_base/message_digest.h"
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#include "rtc_base/network.h"
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#include "rtc_base/numerics/safe_minmax.h"
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#include "rtc_base/string_encode.h"
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#include "rtc_base/string_utils.h"
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#include "rtc_base/strings/string_builder.h"
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#include "rtc_base/third_party/base64/base64.h"
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namespace cricket {
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namespace {
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// Determines whether we have seen at least the given maximum number of
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// pings fail to have a response.
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inline bool TooManyFailures(
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const std::vector<Connection::SentPing>& pings_since_last_response,
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uint32_t maximum_failures,
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int rtt_estimate,
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int64_t now) {
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// If we haven't sent that many pings, then we can't have failed that many.
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if (pings_since_last_response.size() < maximum_failures)
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return false;
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// Check if the window in which we would expect a response to the ping has
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// already elapsed.
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int64_t expected_response_time =
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pings_since_last_response[maximum_failures - 1].sent_time + rtt_estimate;
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return now > expected_response_time;
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}
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// Determines whether we have gone too long without seeing any response.
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inline bool TooLongWithoutResponse(
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const std::vector<Connection::SentPing>& pings_since_last_response,
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int64_t maximum_time,
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int64_t now) {
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if (pings_since_last_response.size() == 0)
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return false;
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auto first = pings_since_last_response[0];
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return now > (first.sent_time + maximum_time);
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}
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// Helper methods for converting string values of log description fields to
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// enum.
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webrtc::IceCandidateType GetCandidateTypeByString(absl::string_view type) {
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if (type == LOCAL_PORT_TYPE) {
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return webrtc::IceCandidateType::kLocal;
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} else if (type == STUN_PORT_TYPE) {
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return webrtc::IceCandidateType::kStun;
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} else if (type == PRFLX_PORT_TYPE) {
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return webrtc::IceCandidateType::kPrflx;
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} else if (type == RELAY_PORT_TYPE) {
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return webrtc::IceCandidateType::kRelay;
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}
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return webrtc::IceCandidateType::kUnknown;
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}
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webrtc::IceCandidatePairProtocol GetProtocolByString(
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absl::string_view protocol) {
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if (protocol == UDP_PROTOCOL_NAME) {
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return webrtc::IceCandidatePairProtocol::kUdp;
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} else if (protocol == TCP_PROTOCOL_NAME) {
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return webrtc::IceCandidatePairProtocol::kTcp;
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} else if (protocol == SSLTCP_PROTOCOL_NAME) {
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return webrtc::IceCandidatePairProtocol::kSsltcp;
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} else if (protocol == TLS_PROTOCOL_NAME) {
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return webrtc::IceCandidatePairProtocol::kTls;
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}
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return webrtc::IceCandidatePairProtocol::kUnknown;
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}
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webrtc::IceCandidatePairAddressFamily GetAddressFamilyByInt(
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int address_family) {
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if (address_family == AF_INET) {
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return webrtc::IceCandidatePairAddressFamily::kIpv4;
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} else if (address_family == AF_INET6) {
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return webrtc::IceCandidatePairAddressFamily::kIpv6;
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}
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return webrtc::IceCandidatePairAddressFamily::kUnknown;
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}
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webrtc::IceCandidateNetworkType ConvertNetworkType(rtc::AdapterType type) {
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switch (type) {
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case rtc::ADAPTER_TYPE_ETHERNET:
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return webrtc::IceCandidateNetworkType::kEthernet;
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case rtc::ADAPTER_TYPE_LOOPBACK:
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return webrtc::IceCandidateNetworkType::kLoopback;
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case rtc::ADAPTER_TYPE_WIFI:
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return webrtc::IceCandidateNetworkType::kWifi;
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case rtc::ADAPTER_TYPE_VPN:
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return webrtc::IceCandidateNetworkType::kVpn;
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case rtc::ADAPTER_TYPE_CELLULAR:
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case rtc::ADAPTER_TYPE_CELLULAR_2G:
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case rtc::ADAPTER_TYPE_CELLULAR_3G:
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case rtc::ADAPTER_TYPE_CELLULAR_4G:
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case rtc::ADAPTER_TYPE_CELLULAR_5G:
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return webrtc::IceCandidateNetworkType::kCellular;
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default:
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return webrtc::IceCandidateNetworkType::kUnknown;
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}
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}
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// When we don't have any RTT data, we have to pick something reasonable. We
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// use a large value just in case the connection is really slow.
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const int DEFAULT_RTT = 3000; // 3 seconds
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// We will restrict RTT estimates (when used for determining state) to be
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// within a reasonable range.
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const int MINIMUM_RTT = 100; // 0.1 seconds
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const int MAXIMUM_RTT = 60000; // 60 seconds
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const int DEFAULT_RTT_ESTIMATE_HALF_TIME_MS = 500;
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// Computes our estimate of the RTT given the current estimate.
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inline int ConservativeRTTEstimate(int rtt) {
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return rtc::SafeClamp(2 * rtt, MINIMUM_RTT, MAXIMUM_RTT);
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}
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// Weighting of the old rtt value to new data.
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const int RTT_RATIO = 3; // 3 : 1
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constexpr int64_t kMinExtraPingDelayMs = 100;
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// Default field trials.
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const IceFieldTrials kDefaultFieldTrials;
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constexpr int kSupportGoogPingVersionRequestIndex = static_cast<int>(
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IceGoogMiscInfoBindingRequestAttributeIndex::SUPPORT_GOOG_PING_VERSION);
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constexpr int kSupportGoogPingVersionResponseIndex = static_cast<int>(
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IceGoogMiscInfoBindingResponseAttributeIndex::SUPPORT_GOOG_PING_VERSION);
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} // namespace
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// A ConnectionRequest is a STUN binding used to determine writability.
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class Connection::ConnectionRequest : public StunRequest {
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public:
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ConnectionRequest(StunRequestManager& manager,
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Connection* connection,
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std::unique_ptr<IceMessage> message);
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void OnResponse(StunMessage* response) override;
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void OnErrorResponse(StunMessage* response) override;
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void OnTimeout() override;
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void OnSent() override;
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int resend_delay() override;
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private:
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Connection* const connection_;
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};
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Connection::ConnectionRequest::ConnectionRequest(
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StunRequestManager& manager,
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Connection* connection,
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std::unique_ptr<IceMessage> message)
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: StunRequest(manager, std::move(message)), connection_(connection) {}
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void Connection::ConnectionRequest::OnResponse(StunMessage* response) {
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RTC_DCHECK_RUN_ON(connection_->network_thread_);
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connection_->OnConnectionRequestResponse(this, response);
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}
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void Connection::ConnectionRequest::OnErrorResponse(StunMessage* response) {
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RTC_DCHECK_RUN_ON(connection_->network_thread_);
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connection_->OnConnectionRequestErrorResponse(this, response);
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}
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void Connection::ConnectionRequest::OnTimeout() {
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RTC_DCHECK_RUN_ON(connection_->network_thread_);
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connection_->OnConnectionRequestTimeout(this);
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}
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void Connection::ConnectionRequest::OnSent() {
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RTC_DCHECK_RUN_ON(connection_->network_thread_);
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connection_->OnConnectionRequestSent(this);
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// Each request is sent only once. After a single delay , the request will
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// time out.
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set_timed_out();
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}
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int Connection::ConnectionRequest::resend_delay() {
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return CONNECTION_RESPONSE_TIMEOUT;
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}
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Connection::Connection(rtc::WeakPtr<Port> port,
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size_t index,
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const Candidate& remote_candidate)
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: network_thread_(port->thread()),
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id_(rtc::CreateRandomId()),
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port_(std::move(port)),
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local_candidate_(port_->Candidates()[index]),
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remote_candidate_(remote_candidate),
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recv_rate_tracker_(100, 10u),
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send_rate_tracker_(100, 10u),
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write_state_(STATE_WRITE_INIT),
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receiving_(false),
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connected_(true),
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pruned_(false),
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use_candidate_attr_(false),
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requests_(port_->thread(),
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[this](const void* data, size_t size, StunRequest* request) {
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OnSendStunPacket(data, size, request);
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}),
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rtt_(DEFAULT_RTT),
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last_ping_sent_(0),
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last_ping_received_(0),
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last_data_received_(0),
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last_ping_response_received_(0),
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state_(IceCandidatePairState::WAITING),
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time_created_ms_(rtc::TimeMillis()),
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field_trials_(&kDefaultFieldTrials),
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rtt_estimate_(DEFAULT_RTT_ESTIMATE_HALF_TIME_MS) {
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RTC_DCHECK_RUN_ON(network_thread_);
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RTC_DCHECK(port_);
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RTC_LOG(LS_INFO) << ToString() << ": Connection created";
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}
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Connection::~Connection() {
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RTC_DCHECK_RUN_ON(network_thread_);
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RTC_DCHECK(!port_);
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}
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webrtc::TaskQueueBase* Connection::network_thread() const {
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return network_thread_;
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}
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const Candidate& Connection::local_candidate() const {
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RTC_DCHECK_RUN_ON(network_thread_);
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return local_candidate_;
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}
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const Candidate& Connection::remote_candidate() const {
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return remote_candidate_;
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}
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const rtc::Network* Connection::network() const {
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return port()->Network();
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}
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int Connection::generation() const {
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return port()->generation();
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}
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uint64_t Connection::priority() const {
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if (!port_)
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return 0;
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uint64_t priority = 0;
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// RFC 5245 - 5.7.2. Computing Pair Priority and Ordering Pairs
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// Let G be the priority for the candidate provided by the controlling
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// agent. Let D be the priority for the candidate provided by the
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// controlled agent.
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// pair priority = 2^32*MIN(G,D) + 2*MAX(G,D) + (G>D?1:0)
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IceRole role = port_->GetIceRole();
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if (role != ICEROLE_UNKNOWN) {
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uint32_t g = 0;
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uint32_t d = 0;
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if (role == ICEROLE_CONTROLLING) {
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g = local_candidate().priority();
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d = remote_candidate_.priority();
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} else {
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g = remote_candidate_.priority();
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d = local_candidate().priority();
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}
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priority = std::min(g, d);
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priority = priority << 32;
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priority += 2 * std::max(g, d) + (g > d ? 1 : 0);
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}
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return priority;
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}
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void Connection::set_write_state(WriteState value) {
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RTC_DCHECK_RUN_ON(network_thread_);
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WriteState old_value = write_state_;
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write_state_ = value;
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if (value != old_value) {
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RTC_LOG(LS_VERBOSE) << ToString() << ": set_write_state from: " << old_value
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<< " to " << value;
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SignalStateChange(this);
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}
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}
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void Connection::UpdateReceiving(int64_t now) {
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RTC_DCHECK_RUN_ON(network_thread_);
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bool receiving;
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if (last_ping_sent() < last_ping_response_received()) {
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// We consider any candidate pair that has its last connectivity check
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// acknowledged by a response as receiving, particularly for backup
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// candidate pairs that send checks at a much slower pace than the selected
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// one. Otherwise, a backup candidate pair constantly becomes not receiving
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// as a side effect of a long ping interval, since we do not have a separate
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// receiving timeout for backup candidate pairs. See
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// IceConfig.ice_backup_candidate_pair_ping_interval,
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// IceConfig.ice_connection_receiving_timeout and their default value.
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receiving = true;
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} else {
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receiving =
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last_received() > 0 && now <= last_received() + receiving_timeout();
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}
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if (receiving_ == receiving) {
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return;
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}
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RTC_LOG(LS_VERBOSE) << ToString() << ": set_receiving to " << receiving;
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receiving_ = receiving;
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receiving_unchanged_since_ = now;
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SignalStateChange(this);
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}
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void Connection::set_state(IceCandidatePairState state) {
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RTC_DCHECK_RUN_ON(network_thread_);
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IceCandidatePairState old_state = state_;
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state_ = state;
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if (state != old_state) {
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RTC_LOG(LS_VERBOSE) << ToString() << ": set_state";
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}
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}
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void Connection::set_connected(bool value) {
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RTC_DCHECK_RUN_ON(network_thread_);
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bool old_value = connected_;
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connected_ = value;
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if (value != old_value) {
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RTC_LOG(LS_VERBOSE) << ToString() << ": Change connected_ to " << value;
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SignalStateChange(this);
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}
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}
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bool Connection::use_candidate_attr() const {
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RTC_DCHECK_RUN_ON(network_thread_);
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return use_candidate_attr_;
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}
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void Connection::set_use_candidate_attr(bool enable) {
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RTC_DCHECK_RUN_ON(network_thread_);
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use_candidate_attr_ = enable;
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}
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void Connection::set_nomination(uint32_t value) {
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RTC_DCHECK_RUN_ON(network_thread_);
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nomination_ = value;
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}
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uint32_t Connection::remote_nomination() const {
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RTC_DCHECK_RUN_ON(network_thread_);
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return remote_nomination_;
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}
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bool Connection::nominated() const {
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RTC_DCHECK_RUN_ON(network_thread_);
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return acked_nomination_ || remote_nomination_;
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}
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int Connection::unwritable_timeout() const {
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RTC_DCHECK_RUN_ON(network_thread_);
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return unwritable_timeout_.value_or(CONNECTION_WRITE_CONNECT_TIMEOUT);
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}
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void Connection::set_unwritable_timeout(const absl::optional<int>& value_ms) {
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RTC_DCHECK_RUN_ON(network_thread_);
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unwritable_timeout_ = value_ms;
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}
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int Connection::unwritable_min_checks() const {
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RTC_DCHECK_RUN_ON(network_thread_);
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return unwritable_min_checks_.value_or(CONNECTION_WRITE_CONNECT_FAILURES);
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}
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void Connection::set_unwritable_min_checks(const absl::optional<int>& value) {
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RTC_DCHECK_RUN_ON(network_thread_);
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unwritable_min_checks_ = value;
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}
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int Connection::inactive_timeout() const {
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RTC_DCHECK_RUN_ON(network_thread_);
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return inactive_timeout_.value_or(CONNECTION_WRITE_TIMEOUT);
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}
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void Connection::set_inactive_timeout(const absl::optional<int>& value) {
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RTC_DCHECK_RUN_ON(network_thread_);
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inactive_timeout_ = value;
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}
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int Connection::receiving_timeout() const {
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RTC_DCHECK_RUN_ON(network_thread_);
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return receiving_timeout_.value_or(WEAK_CONNECTION_RECEIVE_TIMEOUT);
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}
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void Connection::set_receiving_timeout(
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absl::optional<int> receiving_timeout_ms) {
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RTC_DCHECK_RUN_ON(network_thread_);
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receiving_timeout_ = receiving_timeout_ms;
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}
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void Connection::SetIceFieldTrials(const IceFieldTrials* field_trials) {
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RTC_DCHECK_RUN_ON(network_thread_);
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field_trials_ = field_trials;
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rtt_estimate_.SetHalfTime(field_trials->rtt_estimate_halftime_ms);
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}
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void Connection::OnSendStunPacket(const void* data,
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size_t size,
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StunRequest* req) {
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RTC_DCHECK_RUN_ON(network_thread_);
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rtc::PacketOptions options(port_->StunDscpValue());
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options.info_signaled_after_sent.packet_type =
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rtc::PacketType::kIceConnectivityCheck;
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auto err =
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port_->SendTo(data, size, remote_candidate_.address(), options, false);
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if (err < 0) {
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RTC_LOG(LS_WARNING) << ToString()
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<< ": Failed to send STUN ping "
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" err="
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<< err << " id=" << rtc::hex_encode(req->id());
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}
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}
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void Connection::OnReadPacket(const char* data,
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size_t size,
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int64_t packet_time_us) {
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RTC_DCHECK_RUN_ON(network_thread_);
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std::unique_ptr<IceMessage> msg;
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std::string remote_ufrag;
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const rtc::SocketAddress& addr(remote_candidate_.address());
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if (!port_->GetStunMessage(data, size, addr, &msg, &remote_ufrag)) {
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// The packet did not parse as a valid STUN message
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// This is a data packet, pass it along.
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last_data_received_ = rtc::TimeMillis();
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UpdateReceiving(last_data_received_);
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recv_rate_tracker_.AddSamples(size);
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stats_.packets_received++;
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SignalReadPacket(this, data, size, packet_time_us);
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// If timed out sending writability checks, start up again
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if (!pruned_ && (write_state_ == STATE_WRITE_TIMEOUT)) {
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RTC_LOG(LS_WARNING)
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<< "Received a data packet on a timed-out Connection. "
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"Resetting state to STATE_WRITE_INIT.";
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set_write_state(STATE_WRITE_INIT);
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}
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} else if (!msg) {
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// The packet was STUN, but failed a check and was handled internally.
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} else {
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// The packet is STUN and passed the Port checks.
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// Perform our own checks to ensure this packet is valid.
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// If this is a STUN request, then update the receiving bit and respond.
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// If this is a STUN response, then update the writable bit.
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// Log at LS_INFO if we receive a ping on an unwritable connection.
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rtc::LoggingSeverity sev = (!writable() ? rtc::LS_INFO : rtc::LS_VERBOSE);
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switch (msg->integrity()) {
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case StunMessage::IntegrityStatus::kNotSet:
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// Late computation of integrity status, but not an error.
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msg->ValidateMessageIntegrity(remote_candidate().password());
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break;
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case StunMessage::IntegrityStatus::kIntegrityOk:
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if (remote_candidate().password() != msg->password()) {
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|
// Password has changed. Recheck message.
|
|
// TODO(crbug.com/1177125): Redesign logic to check only once.
|
|
msg->RevalidateMessageIntegrity(remote_candidate().password());
|
|
}
|
|
break;
|
|
case StunMessage::IntegrityStatus::kIntegrityBad:
|
|
// Possibly we have a new password to try.
|
|
// TODO(crbug.com/1177125): Redesign logic to check only once.
|
|
msg->RevalidateMessageIntegrity(remote_candidate().password());
|
|
break;
|
|
default:
|
|
// This shouldn't happen.
|
|
RTC_DCHECK_NOTREACHED();
|
|
break;
|
|
}
|
|
switch (msg->type()) {
|
|
case STUN_BINDING_REQUEST:
|
|
RTC_LOG_V(sev) << ToString() << ": Received "
|
|
<< StunMethodToString(msg->type())
|
|
<< ", id=" << rtc::hex_encode(msg->transaction_id());
|
|
if (remote_ufrag == remote_candidate_.username()) {
|
|
HandleStunBindingOrGoogPingRequest(msg.get());
|
|
} else {
|
|
// The packet had the right local username, but the remote username
|
|
// was not the right one for the remote address.
|
|
RTC_LOG(LS_ERROR)
|
|
<< ToString()
|
|
<< ": Received STUN request with bad remote username "
|
|
<< remote_ufrag;
|
|
port_->SendBindingErrorResponse(msg.get(), addr,
|
|
STUN_ERROR_UNAUTHORIZED,
|
|
STUN_ERROR_REASON_UNAUTHORIZED);
|
|
}
|
|
break;
|
|
|
|
// Response from remote peer. Does it match request sent?
|
|
// This doesn't just check, it makes callbacks if transaction
|
|
// id's match.
|
|
case STUN_BINDING_RESPONSE:
|
|
case STUN_BINDING_ERROR_RESPONSE:
|
|
if (msg->IntegrityOk()) {
|
|
requests_.CheckResponse(msg.get());
|
|
}
|
|
// Otherwise silently discard the response.
|
|
break;
|
|
|
|
// Remote end point sent an STUN indication instead of regular binding
|
|
// request. In this case `last_ping_received_` will be updated but no
|
|
// response will be sent.
|
|
case STUN_BINDING_INDICATION:
|
|
ReceivedPing(msg->transaction_id());
|
|
break;
|
|
case GOOG_PING_REQUEST:
|
|
HandleStunBindingOrGoogPingRequest(msg.get());
|
|
break;
|
|
case GOOG_PING_RESPONSE:
|
|
case GOOG_PING_ERROR_RESPONSE:
|
|
if (msg->IntegrityOk()) {
|
|
requests_.CheckResponse(msg.get());
|
|
}
|
|
break;
|
|
default:
|
|
RTC_DCHECK_NOTREACHED();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void Connection::HandleStunBindingOrGoogPingRequest(IceMessage* msg) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
// This connection should now be receiving.
|
|
ReceivedPing(msg->transaction_id());
|
|
if (field_trials_->extra_ice_ping && last_ping_response_received_ == 0) {
|
|
if (local_candidate().type() == RELAY_PORT_TYPE ||
|
|
local_candidate().type() == PRFLX_PORT_TYPE ||
|
|
remote_candidate().type() == RELAY_PORT_TYPE ||
|
|
remote_candidate().type() == PRFLX_PORT_TYPE) {
|
|
const int64_t now = rtc::TimeMillis();
|
|
if (last_ping_sent_ + kMinExtraPingDelayMs <= now) {
|
|
RTC_LOG(LS_INFO) << ToString()
|
|
<< "WebRTC-ExtraICEPing/Sending extra ping"
|
|
" last_ping_sent_: "
|
|
<< last_ping_sent_ << " now: " << now
|
|
<< " (diff: " << (now - last_ping_sent_) << ")";
|
|
Ping(now);
|
|
} else {
|
|
RTC_LOG(LS_INFO) << ToString()
|
|
<< "WebRTC-ExtraICEPing/Not sending extra ping"
|
|
" last_ping_sent_: "
|
|
<< last_ping_sent_ << " now: " << now
|
|
<< " (diff: " << (now - last_ping_sent_) << ")";
|
|
}
|
|
}
|
|
}
|
|
|
|
const rtc::SocketAddress& remote_addr = remote_candidate_.address();
|
|
if (msg->type() == STUN_BINDING_REQUEST) {
|
|
// Check for role conflicts.
|
|
const std::string& remote_ufrag = remote_candidate_.username();
|
|
if (!port_->MaybeIceRoleConflict(remote_addr, msg, remote_ufrag)) {
|
|
// Received conflicting role from the peer.
|
|
RTC_LOG(LS_INFO) << "Received conflicting role from the peer.";
|
|
return;
|
|
}
|
|
}
|
|
|
|
stats_.recv_ping_requests++;
|
|
LogCandidatePairEvent(webrtc::IceCandidatePairEventType::kCheckReceived,
|
|
msg->reduced_transaction_id());
|
|
|
|
// This is a validated stun request from remote peer.
|
|
if (msg->type() == STUN_BINDING_REQUEST) {
|
|
SendStunBindingResponse(msg);
|
|
} else {
|
|
RTC_DCHECK(msg->type() == GOOG_PING_REQUEST);
|
|
SendGoogPingResponse(msg);
|
|
}
|
|
|
|
// If it timed out on writing check, start up again
|
|
if (!pruned_ && write_state_ == STATE_WRITE_TIMEOUT) {
|
|
set_write_state(STATE_WRITE_INIT);
|
|
}
|
|
|
|
if (port_->GetIceRole() == ICEROLE_CONTROLLED) {
|
|
const StunUInt32Attribute* nomination_attr =
|
|
msg->GetUInt32(STUN_ATTR_NOMINATION);
|
|
uint32_t nomination = 0;
|
|
if (nomination_attr) {
|
|
nomination = nomination_attr->value();
|
|
if (nomination == 0) {
|
|
RTC_LOG(LS_ERROR) << "Invalid nomination: " << nomination;
|
|
}
|
|
} else {
|
|
const StunByteStringAttribute* use_candidate_attr =
|
|
msg->GetByteString(STUN_ATTR_USE_CANDIDATE);
|
|
if (use_candidate_attr) {
|
|
nomination = 1;
|
|
}
|
|
}
|
|
// We don't un-nominate a connection, so we only keep a larger nomination.
|
|
if (nomination > remote_nomination_) {
|
|
set_remote_nomination(nomination);
|
|
SignalNominated(this);
|
|
}
|
|
}
|
|
// Set the remote cost if the network_info attribute is available.
|
|
// Note: If packets are re-ordered, we may get incorrect network cost
|
|
// temporarily, but it should get the correct value shortly after that.
|
|
const StunUInt32Attribute* network_attr =
|
|
msg->GetUInt32(STUN_ATTR_GOOG_NETWORK_INFO);
|
|
if (network_attr) {
|
|
uint32_t network_info = network_attr->value();
|
|
uint16_t network_cost = static_cast<uint16_t>(network_info);
|
|
if (network_cost != remote_candidate_.network_cost()) {
|
|
remote_candidate_.set_network_cost(network_cost);
|
|
// Network cost change will affect the connection ranking, so signal
|
|
// state change to force a re-sort in P2PTransportChannel.
|
|
SignalStateChange(this);
|
|
}
|
|
}
|
|
|
|
if (field_trials_->piggyback_ice_check_acknowledgement) {
|
|
HandlePiggybackCheckAcknowledgementIfAny(msg);
|
|
}
|
|
}
|
|
|
|
void Connection::SendStunBindingResponse(const StunMessage* message) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
RTC_DCHECK_EQ(message->type(), STUN_BINDING_REQUEST);
|
|
|
|
// Retrieve the username from the `message`.
|
|
const StunByteStringAttribute* username_attr =
|
|
message->GetByteString(STUN_ATTR_USERNAME);
|
|
RTC_DCHECK(username_attr != NULL);
|
|
if (username_attr == NULL) {
|
|
// No valid username, skip the response.
|
|
return;
|
|
}
|
|
|
|
// Fill in the response.
|
|
StunMessage response(STUN_BINDING_RESPONSE, message->transaction_id());
|
|
const StunUInt32Attribute* retransmit_attr =
|
|
message->GetUInt32(STUN_ATTR_RETRANSMIT_COUNT);
|
|
if (retransmit_attr) {
|
|
// Inherit the incoming retransmit value in the response so the other side
|
|
// can see our view of lost pings.
|
|
response.AddAttribute(std::make_unique<StunUInt32Attribute>(
|
|
STUN_ATTR_RETRANSMIT_COUNT, retransmit_attr->value()));
|
|
|
|
if (retransmit_attr->value() > CONNECTION_WRITE_CONNECT_FAILURES) {
|
|
RTC_LOG(LS_INFO)
|
|
<< ToString()
|
|
<< ": Received a remote ping with high retransmit count: "
|
|
<< retransmit_attr->value();
|
|
}
|
|
}
|
|
|
|
response.AddAttribute(std::make_unique<StunXorAddressAttribute>(
|
|
STUN_ATTR_XOR_MAPPED_ADDRESS, remote_candidate_.address()));
|
|
|
|
if (field_trials_->announce_goog_ping) {
|
|
// Check if message contains a announce-request.
|
|
auto goog_misc = message->GetUInt16List(STUN_ATTR_GOOG_MISC_INFO);
|
|
if (goog_misc != nullptr &&
|
|
goog_misc->Size() >= kSupportGoogPingVersionRequestIndex &&
|
|
// Which version can we handle...currently any >= 1
|
|
goog_misc->GetType(kSupportGoogPingVersionRequestIndex) >= 1) {
|
|
auto list =
|
|
StunAttribute::CreateUInt16ListAttribute(STUN_ATTR_GOOG_MISC_INFO);
|
|
list->AddTypeAtIndex(kSupportGoogPingVersionResponseIndex,
|
|
kGoogPingVersion);
|
|
response.AddAttribute(std::move(list));
|
|
}
|
|
}
|
|
|
|
response.AddMessageIntegrity(local_candidate().password());
|
|
response.AddFingerprint();
|
|
|
|
SendResponseMessage(response);
|
|
}
|
|
|
|
void Connection::SendGoogPingResponse(const StunMessage* message) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
RTC_DCHECK(message->type() == GOOG_PING_REQUEST);
|
|
|
|
// Fill in the response.
|
|
StunMessage response(GOOG_PING_RESPONSE, message->transaction_id());
|
|
response.AddMessageIntegrity32(local_candidate().password());
|
|
SendResponseMessage(response);
|
|
}
|
|
|
|
void Connection::SendResponseMessage(const StunMessage& response) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
// Where I send the response.
|
|
const rtc::SocketAddress& addr = remote_candidate_.address();
|
|
|
|
// Send the response.
|
|
rtc::ByteBufferWriter buf;
|
|
response.Write(&buf);
|
|
rtc::PacketOptions options(port_->StunDscpValue());
|
|
options.info_signaled_after_sent.packet_type =
|
|
rtc::PacketType::kIceConnectivityCheckResponse;
|
|
auto err = port_->SendTo(buf.Data(), buf.Length(), addr, options, false);
|
|
if (err < 0) {
|
|
RTC_LOG(LS_ERROR) << ToString() << ": Failed to send "
|
|
<< StunMethodToString(response.type())
|
|
<< ", to=" << addr.ToSensitiveString() << ", err=" << err
|
|
<< ", id=" << rtc::hex_encode(response.transaction_id());
|
|
} else {
|
|
// Log at LS_INFO if we send a stun ping response on an unwritable
|
|
// connection.
|
|
rtc::LoggingSeverity sev = (!writable()) ? rtc::LS_INFO : rtc::LS_VERBOSE;
|
|
RTC_LOG_V(sev) << ToString() << ": Sent "
|
|
<< StunMethodToString(response.type())
|
|
<< ", to=" << addr.ToSensitiveString()
|
|
<< ", id=" << rtc::hex_encode(response.transaction_id());
|
|
|
|
stats_.sent_ping_responses++;
|
|
LogCandidatePairEvent(webrtc::IceCandidatePairEventType::kCheckResponseSent,
|
|
response.reduced_transaction_id());
|
|
}
|
|
}
|
|
|
|
uint32_t Connection::acked_nomination() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return acked_nomination_;
|
|
}
|
|
|
|
void Connection::set_remote_nomination(uint32_t remote_nomination) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
remote_nomination_ = remote_nomination;
|
|
}
|
|
|
|
void Connection::OnReadyToSend() {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
SignalReadyToSend(this);
|
|
}
|
|
|
|
bool Connection::pruned() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return pruned_;
|
|
}
|
|
|
|
void Connection::Prune() {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
if (!pruned_ || active()) {
|
|
RTC_LOG(LS_INFO) << ToString() << ": Connection pruned";
|
|
pruned_ = true;
|
|
requests_.Clear();
|
|
set_write_state(STATE_WRITE_TIMEOUT);
|
|
}
|
|
}
|
|
|
|
void Connection::Destroy() {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
RTC_DCHECK(port_) << "Calling Destroy() twice?";
|
|
if (port_)
|
|
port_->DestroyConnection(this);
|
|
}
|
|
|
|
bool Connection::Shutdown() {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
if (!port_)
|
|
return false; // already shut down.
|
|
|
|
RTC_DLOG(LS_VERBOSE) << ToString() << ": Connection destroyed";
|
|
|
|
// Fire the 'destroyed' event before deleting the object. This is done
|
|
// intentionally to avoid a situation whereby the signal might have dangling
|
|
// pointers to objects that have been deleted by the time the async task
|
|
// that deletes the connection object runs.
|
|
auto destroyed_signals = SignalDestroyed;
|
|
SignalDestroyed.disconnect_all();
|
|
destroyed_signals(this);
|
|
|
|
LogCandidatePairConfig(webrtc::IceCandidatePairConfigType::kDestroyed);
|
|
|
|
// Reset the `port_` after logging and firing the destroyed signal since
|
|
// information required for logging needs access to `port_`.
|
|
port_.reset();
|
|
|
|
return true;
|
|
}
|
|
|
|
void Connection::FailAndPrune() {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
|
|
// TODO(bugs.webrtc.org/13865): There's a circular dependency between Port
|
|
// and Connection. In some cases (Port dtor), a Connection object is deleted
|
|
// without using the `Destroy` method (port_ won't be nulled and some
|
|
// functionality won't run as expected), while in other cases
|
|
// the Connection object is deleted asynchronously and in that case `port_`
|
|
// will be nulled.
|
|
// In such a case, there's a chance that the Port object gets
|
|
// deleted before the Connection object ends up being deleted.
|
|
if (!port_)
|
|
return;
|
|
|
|
set_state(IceCandidatePairState::FAILED);
|
|
Prune();
|
|
}
|
|
|
|
void Connection::PrintPingsSinceLastResponse(std::string* s, size_t max) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
rtc::StringBuilder oss;
|
|
if (pings_since_last_response_.size() > max) {
|
|
for (size_t i = 0; i < max; i++) {
|
|
const SentPing& ping = pings_since_last_response_[i];
|
|
oss << rtc::hex_encode(ping.id) << " ";
|
|
}
|
|
oss << "... " << (pings_since_last_response_.size() - max) << " more";
|
|
} else {
|
|
for (const SentPing& ping : pings_since_last_response_) {
|
|
oss << rtc::hex_encode(ping.id) << " ";
|
|
}
|
|
}
|
|
*s = oss.str();
|
|
}
|
|
|
|
bool Connection::selected() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return selected_;
|
|
}
|
|
|
|
void Connection::set_selected(bool selected) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
selected_ = selected;
|
|
}
|
|
|
|
void Connection::UpdateState(int64_t now) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
if (!port_)
|
|
return;
|
|
|
|
int rtt = ConservativeRTTEstimate(rtt_);
|
|
|
|
if (RTC_LOG_CHECK_LEVEL(LS_VERBOSE)) {
|
|
std::string pings;
|
|
PrintPingsSinceLastResponse(&pings, 5);
|
|
RTC_LOG(LS_VERBOSE) << ToString()
|
|
<< ": UpdateState()"
|
|
", ms since last received response="
|
|
<< now - last_ping_response_received_
|
|
<< ", ms since last received data="
|
|
<< now - last_data_received_ << ", rtt=" << rtt
|
|
<< ", pings_since_last_response=" << pings;
|
|
}
|
|
|
|
// Check the writable state. (The order of these checks is important.)
|
|
//
|
|
// Before becoming unwritable, we allow for a fixed number of pings to fail
|
|
// (i.e., receive no response). We also have to give the response time to
|
|
// get back, so we include a conservative estimate of this.
|
|
//
|
|
// Before timing out writability, we give a fixed amount of time. This is to
|
|
// allow for changes in network conditions.
|
|
|
|
if ((write_state_ == STATE_WRITABLE) &&
|
|
TooManyFailures(pings_since_last_response_, unwritable_min_checks(), rtt,
|
|
now) &&
|
|
TooLongWithoutResponse(pings_since_last_response_, unwritable_timeout(),
|
|
now)) {
|
|
uint32_t max_pings = unwritable_min_checks();
|
|
RTC_LOG(LS_INFO) << ToString() << ": Unwritable after " << max_pings
|
|
<< " ping failures and "
|
|
<< now - pings_since_last_response_[0].sent_time
|
|
<< " ms without a response,"
|
|
" ms since last received ping="
|
|
<< now - last_ping_received_
|
|
<< " ms since last received data="
|
|
<< now - last_data_received_ << " rtt=" << rtt;
|
|
set_write_state(STATE_WRITE_UNRELIABLE);
|
|
}
|
|
if ((write_state_ == STATE_WRITE_UNRELIABLE ||
|
|
write_state_ == STATE_WRITE_INIT) &&
|
|
TooLongWithoutResponse(pings_since_last_response_, inactive_timeout(),
|
|
now)) {
|
|
RTC_LOG(LS_INFO) << ToString() << ": Timed out after "
|
|
<< now - pings_since_last_response_[0].sent_time
|
|
<< " ms without a response, rtt=" << rtt;
|
|
set_write_state(STATE_WRITE_TIMEOUT);
|
|
}
|
|
|
|
// Update the receiving state.
|
|
UpdateReceiving(now);
|
|
if (dead(now)) {
|
|
port_->DestroyConnectionAsync(this);
|
|
}
|
|
}
|
|
|
|
void Connection::UpdateLocalIceParameters(int component,
|
|
absl::string_view username_fragment,
|
|
absl::string_view password) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
local_candidate_.set_component(component);
|
|
local_candidate_.set_username(username_fragment);
|
|
local_candidate_.set_password(password);
|
|
}
|
|
|
|
int64_t Connection::last_ping_sent() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return last_ping_sent_;
|
|
}
|
|
|
|
void Connection::Ping(int64_t now) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
if (!port_)
|
|
return;
|
|
|
|
last_ping_sent_ = now;
|
|
|
|
// If not using renomination, we use "1" to mean "nominated" and "0" to mean
|
|
// "not nominated". If using renomination, values greater than 1 are used for
|
|
// re-nominated pairs.
|
|
int nomination = use_candidate_attr_ ? 1 : 0;
|
|
if (nomination_ > 0) {
|
|
nomination = nomination_;
|
|
}
|
|
|
|
auto req =
|
|
std::make_unique<ConnectionRequest>(requests_, this, BuildPingRequest());
|
|
|
|
if (ShouldSendGoogPing(req->msg())) {
|
|
auto message = std::make_unique<IceMessage>(GOOG_PING_REQUEST, req->id());
|
|
message->AddMessageIntegrity32(remote_candidate_.password());
|
|
req.reset(new ConnectionRequest(requests_, this, std::move(message)));
|
|
}
|
|
|
|
pings_since_last_response_.push_back(SentPing(req->id(), now, nomination));
|
|
RTC_LOG(LS_VERBOSE) << ToString() << ": Sending STUN ping, id="
|
|
<< rtc::hex_encode(req->id())
|
|
<< ", nomination=" << nomination_;
|
|
requests_.Send(req.release());
|
|
state_ = IceCandidatePairState::IN_PROGRESS;
|
|
num_pings_sent_++;
|
|
}
|
|
|
|
std::unique_ptr<IceMessage> Connection::BuildPingRequest() {
|
|
auto message = std::make_unique<IceMessage>(STUN_BINDING_REQUEST);
|
|
// Note that the order of attributes does not impact the parsing on the
|
|
// receiver side. The attribute is retrieved then by iterating and matching
|
|
// over all parsed attributes. See StunMessage::GetAttribute.
|
|
message->AddAttribute(std::make_unique<StunByteStringAttribute>(
|
|
STUN_ATTR_USERNAME,
|
|
port()->CreateStunUsername(remote_candidate_.username())));
|
|
message->AddAttribute(std::make_unique<StunUInt32Attribute>(
|
|
STUN_ATTR_GOOG_NETWORK_INFO,
|
|
(port_->Network()->id() << 16) | port_->network_cost()));
|
|
|
|
if (field_trials_->piggyback_ice_check_acknowledgement &&
|
|
last_ping_id_received_) {
|
|
message->AddAttribute(std::make_unique<StunByteStringAttribute>(
|
|
STUN_ATTR_GOOG_LAST_ICE_CHECK_RECEIVED, *last_ping_id_received_));
|
|
}
|
|
|
|
// Adding ICE_CONTROLLED or ICE_CONTROLLING attribute based on the role.
|
|
IceRole ice_role = port_->GetIceRole();
|
|
RTC_DCHECK(ice_role == ICEROLE_CONTROLLING || ice_role == ICEROLE_CONTROLLED);
|
|
message->AddAttribute(std::make_unique<StunUInt64Attribute>(
|
|
ice_role == ICEROLE_CONTROLLING ? STUN_ATTR_ICE_CONTROLLING
|
|
: STUN_ATTR_ICE_CONTROLLED,
|
|
port_->IceTiebreaker()));
|
|
|
|
if (ice_role == ICEROLE_CONTROLLING) {
|
|
// We should have either USE_CANDIDATE attribute or ICE_NOMINATION
|
|
// attribute but not both. That was enforced in p2ptransportchannel.
|
|
if (use_candidate_attr()) {
|
|
message->AddAttribute(
|
|
std::make_unique<StunByteStringAttribute>(STUN_ATTR_USE_CANDIDATE));
|
|
}
|
|
if (nomination_ && nomination_ != acked_nomination()) {
|
|
message->AddAttribute(std::make_unique<StunUInt32Attribute>(
|
|
STUN_ATTR_NOMINATION, nomination_));
|
|
}
|
|
}
|
|
|
|
message->AddAttribute(std::make_unique<StunUInt32Attribute>(
|
|
STUN_ATTR_PRIORITY, prflx_priority()));
|
|
|
|
if (port()->send_retransmit_count_attribute()) {
|
|
message->AddAttribute(std::make_unique<StunUInt32Attribute>(
|
|
STUN_ATTR_RETRANSMIT_COUNT, pings_since_last_response_.size()));
|
|
}
|
|
if (field_trials_->enable_goog_ping &&
|
|
!remote_support_goog_ping_.has_value()) {
|
|
// Check if remote supports GOOG PING by announcing which version we
|
|
// support. This is sent on all STUN_BINDING_REQUEST until we get a
|
|
// STUN_BINDING_RESPONSE.
|
|
auto list =
|
|
StunAttribute::CreateUInt16ListAttribute(STUN_ATTR_GOOG_MISC_INFO);
|
|
list->AddTypeAtIndex(kSupportGoogPingVersionRequestIndex, kGoogPingVersion);
|
|
message->AddAttribute(std::move(list));
|
|
}
|
|
message->AddMessageIntegrity(remote_candidate_.password());
|
|
message->AddFingerprint();
|
|
|
|
return message;
|
|
}
|
|
|
|
int64_t Connection::last_ping_response_received() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return last_ping_response_received_;
|
|
}
|
|
|
|
const absl::optional<std::string>& Connection::last_ping_id_received() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return last_ping_id_received_;
|
|
}
|
|
|
|
// Used to check if any STUN ping response has been received.
|
|
int Connection::rtt_samples() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return rtt_samples_;
|
|
}
|
|
|
|
// Called whenever a valid ping is received on this connection. This is
|
|
// public because the connection intercepts the first ping for us.
|
|
int64_t Connection::last_ping_received() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return last_ping_received_;
|
|
}
|
|
|
|
void Connection::ReceivedPing(const absl::optional<std::string>& request_id) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
last_ping_received_ = rtc::TimeMillis();
|
|
last_ping_id_received_ = request_id;
|
|
UpdateReceiving(last_ping_received_);
|
|
}
|
|
|
|
void Connection::HandlePiggybackCheckAcknowledgementIfAny(StunMessage* msg) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
RTC_DCHECK(msg->type() == STUN_BINDING_REQUEST ||
|
|
msg->type() == GOOG_PING_REQUEST);
|
|
const StunByteStringAttribute* last_ice_check_received_attr =
|
|
msg->GetByteString(STUN_ATTR_GOOG_LAST_ICE_CHECK_RECEIVED);
|
|
if (last_ice_check_received_attr) {
|
|
const absl::string_view request_id =
|
|
last_ice_check_received_attr->string_view();
|
|
auto iter = absl::c_find_if(
|
|
pings_since_last_response_,
|
|
[&request_id](const SentPing& ping) { return ping.id == request_id; });
|
|
if (iter != pings_since_last_response_.end()) {
|
|
rtc::LoggingSeverity sev = !writable() ? rtc::LS_INFO : rtc::LS_VERBOSE;
|
|
RTC_LOG_V(sev) << ToString()
|
|
<< ": Received piggyback STUN ping response, id="
|
|
<< rtc::hex_encode(request_id);
|
|
const int64_t rtt = rtc::TimeMillis() - iter->sent_time;
|
|
ReceivedPingResponse(rtt, request_id, iter->nomination);
|
|
}
|
|
}
|
|
}
|
|
|
|
int64_t Connection::last_send_data() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return last_send_data_;
|
|
}
|
|
|
|
int64_t Connection::last_data_received() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return last_data_received_;
|
|
}
|
|
|
|
void Connection::ReceivedPingResponse(
|
|
int rtt,
|
|
absl::string_view request_id,
|
|
const absl::optional<uint32_t>& nomination) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
RTC_DCHECK_GE(rtt, 0);
|
|
// We've already validated that this is a STUN binding response with
|
|
// the correct local and remote username for this connection.
|
|
// So if we're not already, become writable. We may be bringing a pruned
|
|
// connection back to life, but if we don't really want it, we can always
|
|
// prune it again.
|
|
if (nomination && nomination.value() > acked_nomination_) {
|
|
acked_nomination_ = nomination.value();
|
|
}
|
|
|
|
int64_t now = rtc::TimeMillis();
|
|
total_round_trip_time_ms_ += rtt;
|
|
current_round_trip_time_ms_ = static_cast<uint32_t>(rtt);
|
|
rtt_estimate_.AddSample(now, rtt);
|
|
|
|
pings_since_last_response_.clear();
|
|
last_ping_response_received_ = now;
|
|
UpdateReceiving(last_ping_response_received_);
|
|
set_write_state(STATE_WRITABLE);
|
|
set_state(IceCandidatePairState::SUCCEEDED);
|
|
if (rtt_samples_ > 0) {
|
|
rtt_ = rtc::GetNextMovingAverage(rtt_, rtt, RTT_RATIO);
|
|
} else {
|
|
rtt_ = rtt;
|
|
}
|
|
rtt_samples_++;
|
|
}
|
|
|
|
Connection::WriteState Connection::write_state() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return write_state_;
|
|
}
|
|
|
|
bool Connection::writable() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return write_state_ == STATE_WRITABLE;
|
|
}
|
|
|
|
bool Connection::receiving() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return receiving_;
|
|
}
|
|
|
|
// Determines whether the connection has finished connecting. This can only
|
|
// be false for TCP connections.
|
|
bool Connection::connected() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return connected_;
|
|
}
|
|
|
|
bool Connection::weak() const {
|
|
return !(writable() && receiving() && connected());
|
|
}
|
|
|
|
bool Connection::active() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return write_state_ != STATE_WRITE_TIMEOUT;
|
|
}
|
|
|
|
bool Connection::dead(int64_t now) const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
if (last_received() > 0) {
|
|
// If it has ever received anything, we keep it alive
|
|
// - if it has recevied last DEAD_CONNECTION_RECEIVE_TIMEOUT (30s)
|
|
// - if it has a ping outstanding shorter than
|
|
// DEAD_CONNECTION_RECEIVE_TIMEOUT (30s)
|
|
// - else if IDLE let it live field_trials_->dead_connection_timeout_ms
|
|
//
|
|
// This covers the normal case of a successfully used connection that stops
|
|
// working. This also allows a remote peer to continue pinging over a
|
|
// locally inactive (pruned) connection. This also allows the local agent to
|
|
// ping with longer interval than 30s as long as it shorter than
|
|
// `dead_connection_timeout_ms`.
|
|
if (now <= (last_received() + DEAD_CONNECTION_RECEIVE_TIMEOUT)) {
|
|
// Not dead since we have received the last 30s.
|
|
return false;
|
|
}
|
|
if (!pings_since_last_response_.empty()) {
|
|
// Outstanding pings: let it live until the ping is unreplied for
|
|
// DEAD_CONNECTION_RECEIVE_TIMEOUT.
|
|
return now > (pings_since_last_response_[0].sent_time +
|
|
DEAD_CONNECTION_RECEIVE_TIMEOUT);
|
|
}
|
|
|
|
// No outstanding pings: let it live until
|
|
// field_trials_->dead_connection_timeout_ms has passed.
|
|
return now > (last_received() + field_trials_->dead_connection_timeout_ms);
|
|
}
|
|
|
|
if (active()) {
|
|
// If it has never received anything, keep it alive as long as it is
|
|
// actively pinging and not pruned. Otherwise, the connection might be
|
|
// deleted before it has a chance to ping. This is the normal case for a
|
|
// new connection that is pinging but hasn't received anything yet.
|
|
return false;
|
|
}
|
|
|
|
// If it has never received anything and is not actively pinging (pruned), we
|
|
// keep it around for at least MIN_CONNECTION_LIFETIME to prevent connections
|
|
// from being pruned too quickly during a network change event when two
|
|
// networks would be up simultaneously but only for a brief period.
|
|
return now > (time_created_ms_ + MIN_CONNECTION_LIFETIME);
|
|
}
|
|
|
|
int Connection::rtt() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return rtt_;
|
|
}
|
|
|
|
bool Connection::stable(int64_t now) const {
|
|
// A connection is stable if it's RTT has converged and it isn't missing any
|
|
// responses. We should send pings at a higher rate until the RTT converges
|
|
// and whenever a ping response is missing (so that we can detect
|
|
// unwritability faster)
|
|
return rtt_converged() && !missing_responses(now);
|
|
}
|
|
|
|
std::string Connection::ToDebugId() const {
|
|
return rtc::ToHex(reinterpret_cast<uintptr_t>(this));
|
|
}
|
|
|
|
uint32_t Connection::ComputeNetworkCost() const {
|
|
// TODO(honghaiz): Will add rtt as part of the network cost.
|
|
return port()->network_cost() + remote_candidate_.network_cost();
|
|
}
|
|
|
|
std::string Connection::ToString() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
constexpr absl::string_view CONNECT_STATE_ABBREV[2] = {
|
|
"-", // not connected (false)
|
|
"C", // connected (true)
|
|
};
|
|
constexpr absl::string_view RECEIVE_STATE_ABBREV[2] = {
|
|
"-", // not receiving (false)
|
|
"R", // receiving (true)
|
|
};
|
|
constexpr absl::string_view WRITE_STATE_ABBREV[4] = {
|
|
"W", // STATE_WRITABLE
|
|
"w", // STATE_WRITE_UNRELIABLE
|
|
"-", // STATE_WRITE_INIT
|
|
"x", // STATE_WRITE_TIMEOUT
|
|
};
|
|
constexpr absl::string_view ICESTATE[4] = {
|
|
"W", // STATE_WAITING
|
|
"I", // STATE_INPROGRESS
|
|
"S", // STATE_SUCCEEDED
|
|
"F" // STATE_FAILED
|
|
};
|
|
constexpr absl::string_view SELECTED_STATE_ABBREV[2] = {
|
|
"-", // candidate pair not selected (false)
|
|
"S", // selected (true)
|
|
};
|
|
rtc::StringBuilder ss;
|
|
ss << "Conn[" << ToDebugId();
|
|
|
|
if (!port_) {
|
|
// No content or network names for pending delete. Temporarily substitute
|
|
// the names with a hash (rhyming with trash).
|
|
ss << ":#:#:";
|
|
} else {
|
|
ss << ":" << port_->content_name() << ":" << port_->Network()->ToString()
|
|
<< ":";
|
|
}
|
|
|
|
const Candidate& local = local_candidate();
|
|
const Candidate& remote = remote_candidate();
|
|
ss << local.id() << ":" << local.component() << ":" << local.generation()
|
|
<< ":" << local.type() << ":" << local.protocol() << ":"
|
|
<< local.address().ToSensitiveString() << "->" << remote.id() << ":"
|
|
<< remote.component() << ":" << remote.priority() << ":" << remote.type()
|
|
<< ":" << remote.protocol() << ":" << remote.address().ToSensitiveString()
|
|
<< "|";
|
|
|
|
ss << CONNECT_STATE_ABBREV[connected_] << RECEIVE_STATE_ABBREV[receiving_]
|
|
<< WRITE_STATE_ABBREV[write_state_] << ICESTATE[static_cast<int>(state_)]
|
|
<< "|" << SELECTED_STATE_ABBREV[selected_] << "|" << remote_nomination_
|
|
<< "|" << nomination_ << "|";
|
|
|
|
if (port_)
|
|
ss << priority() << "|";
|
|
|
|
if (rtt_ < DEFAULT_RTT) {
|
|
ss << rtt_ << "]";
|
|
} else {
|
|
ss << "-]";
|
|
}
|
|
|
|
return ss.Release();
|
|
}
|
|
|
|
std::string Connection::ToSensitiveString() const {
|
|
return ToString();
|
|
}
|
|
|
|
const webrtc::IceCandidatePairDescription& Connection::ToLogDescription() {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
if (log_description_.has_value()) {
|
|
return log_description_.value();
|
|
}
|
|
const Candidate& local = local_candidate();
|
|
const Candidate& remote = remote_candidate();
|
|
const rtc::Network* network = port()->Network();
|
|
log_description_ = webrtc::IceCandidatePairDescription();
|
|
log_description_->local_candidate_type =
|
|
GetCandidateTypeByString(local.type());
|
|
log_description_->local_relay_protocol =
|
|
GetProtocolByString(local.relay_protocol());
|
|
log_description_->local_network_type = ConvertNetworkType(network->type());
|
|
log_description_->local_address_family =
|
|
GetAddressFamilyByInt(local.address().family());
|
|
log_description_->remote_candidate_type =
|
|
GetCandidateTypeByString(remote.type());
|
|
log_description_->remote_address_family =
|
|
GetAddressFamilyByInt(remote.address().family());
|
|
log_description_->candidate_pair_protocol =
|
|
GetProtocolByString(local.protocol());
|
|
return log_description_.value();
|
|
}
|
|
|
|
void Connection::set_ice_event_log(webrtc::IceEventLog* ice_event_log) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
ice_event_log_ = ice_event_log;
|
|
}
|
|
|
|
void Connection::LogCandidatePairConfig(
|
|
webrtc::IceCandidatePairConfigType type) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
if (ice_event_log_ == nullptr) {
|
|
return;
|
|
}
|
|
ice_event_log_->LogCandidatePairConfig(type, id(), ToLogDescription());
|
|
}
|
|
|
|
void Connection::LogCandidatePairEvent(webrtc::IceCandidatePairEventType type,
|
|
uint32_t transaction_id) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
if (ice_event_log_ == nullptr) {
|
|
return;
|
|
}
|
|
ice_event_log_->LogCandidatePairEvent(type, id(), transaction_id);
|
|
}
|
|
|
|
void Connection::OnConnectionRequestResponse(StunRequest* request,
|
|
StunMessage* response) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
// Log at LS_INFO if we receive a ping response on an unwritable
|
|
// connection.
|
|
rtc::LoggingSeverity sev = !writable() ? rtc::LS_INFO : rtc::LS_VERBOSE;
|
|
|
|
int rtt = request->Elapsed();
|
|
|
|
if (RTC_LOG_CHECK_LEVEL_V(sev)) {
|
|
std::string pings;
|
|
PrintPingsSinceLastResponse(&pings, 5);
|
|
RTC_LOG_V(sev) << ToString() << ": Received "
|
|
<< StunMethodToString(response->type())
|
|
<< ", id=" << rtc::hex_encode(request->id())
|
|
<< ", code=0" // Makes logging easier to parse.
|
|
", rtt="
|
|
<< rtt << ", pings_since_last_response=" << pings;
|
|
}
|
|
absl::optional<uint32_t> nomination;
|
|
const std::string request_id = request->id();
|
|
auto iter = absl::c_find_if(
|
|
pings_since_last_response_,
|
|
[&request_id](const SentPing& ping) { return ping.id == request_id; });
|
|
if (iter != pings_since_last_response_.end()) {
|
|
nomination.emplace(iter->nomination);
|
|
}
|
|
ReceivedPingResponse(rtt, request_id, nomination);
|
|
|
|
stats_.recv_ping_responses++;
|
|
LogCandidatePairEvent(
|
|
webrtc::IceCandidatePairEventType::kCheckResponseReceived,
|
|
response->reduced_transaction_id());
|
|
|
|
if (request->msg()->type() == STUN_BINDING_REQUEST) {
|
|
if (!remote_support_goog_ping_.has_value()) {
|
|
auto goog_misc = response->GetUInt16List(STUN_ATTR_GOOG_MISC_INFO);
|
|
if (goog_misc != nullptr &&
|
|
goog_misc->Size() >= kSupportGoogPingVersionResponseIndex) {
|
|
// The remote peer has indicated that it {does/does not} supports
|
|
// GOOG_PING.
|
|
remote_support_goog_ping_ =
|
|
goog_misc->GetType(kSupportGoogPingVersionResponseIndex) >=
|
|
kGoogPingVersion;
|
|
} else {
|
|
remote_support_goog_ping_ = false;
|
|
}
|
|
}
|
|
|
|
MaybeUpdateLocalCandidate(request, response);
|
|
|
|
if (field_trials_->enable_goog_ping && remote_support_goog_ping_) {
|
|
cached_stun_binding_ = request->msg()->Clone();
|
|
}
|
|
}
|
|
}
|
|
|
|
void Connection::OnConnectionRequestErrorResponse(ConnectionRequest* request,
|
|
StunMessage* response) {
|
|
if (!port_)
|
|
return;
|
|
|
|
int error_code = response->GetErrorCodeValue();
|
|
RTC_LOG(LS_WARNING) << ToString() << ": Received "
|
|
<< StunMethodToString(response->type())
|
|
<< " id=" << rtc::hex_encode(request->id())
|
|
<< " code=" << error_code
|
|
<< " rtt=" << request->Elapsed();
|
|
|
|
cached_stun_binding_.reset();
|
|
if (error_code == STUN_ERROR_UNKNOWN_ATTRIBUTE ||
|
|
error_code == STUN_ERROR_SERVER_ERROR ||
|
|
error_code == STUN_ERROR_UNAUTHORIZED) {
|
|
// Recoverable error, retry
|
|
} else if (error_code == STUN_ERROR_ROLE_CONFLICT) {
|
|
port_->SignalRoleConflict(port_.get());
|
|
} else if (request->msg()->type() == GOOG_PING_REQUEST) {
|
|
// Race, retry.
|
|
} else {
|
|
// This is not a valid connection.
|
|
RTC_LOG(LS_ERROR) << ToString()
|
|
<< ": Received STUN error response, code=" << error_code
|
|
<< "; killing connection";
|
|
set_state(IceCandidatePairState::FAILED);
|
|
port_->DestroyConnectionAsync(this);
|
|
}
|
|
}
|
|
|
|
void Connection::OnConnectionRequestTimeout(ConnectionRequest* request) {
|
|
// Log at LS_INFO if we miss a ping on a writable connection.
|
|
rtc::LoggingSeverity sev = writable() ? rtc::LS_INFO : rtc::LS_VERBOSE;
|
|
RTC_LOG_V(sev) << ToString() << ": Timing-out STUN ping "
|
|
<< rtc::hex_encode(request->id()) << " after "
|
|
<< request->Elapsed() << " ms";
|
|
}
|
|
|
|
void Connection::OnConnectionRequestSent(ConnectionRequest* request) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
// Log at LS_INFO if we send a ping on an unwritable connection.
|
|
rtc::LoggingSeverity sev = !writable() ? rtc::LS_INFO : rtc::LS_VERBOSE;
|
|
RTC_LOG_V(sev) << ToString() << ": Sent "
|
|
<< StunMethodToString(request->msg()->type())
|
|
<< ", id=" << rtc::hex_encode(request->id())
|
|
<< ", use_candidate=" << use_candidate_attr()
|
|
<< ", nomination=" << nomination_;
|
|
stats_.sent_ping_requests_total++;
|
|
LogCandidatePairEvent(webrtc::IceCandidatePairEventType::kCheckSent,
|
|
request->reduced_transaction_id());
|
|
if (stats_.recv_ping_responses == 0) {
|
|
stats_.sent_ping_requests_before_first_response++;
|
|
}
|
|
}
|
|
|
|
IceCandidatePairState Connection::state() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return state_;
|
|
}
|
|
|
|
int Connection::num_pings_sent() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return num_pings_sent_;
|
|
}
|
|
|
|
void Connection::MaybeSetRemoteIceParametersAndGeneration(
|
|
const IceParameters& ice_params,
|
|
int generation) {
|
|
if (remote_candidate_.username() == ice_params.ufrag &&
|
|
remote_candidate_.password().empty()) {
|
|
remote_candidate_.set_password(ice_params.pwd);
|
|
}
|
|
// TODO(deadbeef): A value of '0' for the generation is used for both
|
|
// generation 0 and "generation unknown". It should be changed to an
|
|
// absl::optional to fix this.
|
|
if (remote_candidate_.username() == ice_params.ufrag &&
|
|
remote_candidate_.password() == ice_params.pwd &&
|
|
remote_candidate_.generation() == 0) {
|
|
remote_candidate_.set_generation(generation);
|
|
}
|
|
}
|
|
|
|
void Connection::MaybeUpdatePeerReflexiveCandidate(
|
|
const Candidate& new_candidate) {
|
|
if (remote_candidate_.type() == PRFLX_PORT_TYPE &&
|
|
new_candidate.type() != PRFLX_PORT_TYPE &&
|
|
remote_candidate_.protocol() == new_candidate.protocol() &&
|
|
remote_candidate_.address() == new_candidate.address() &&
|
|
remote_candidate_.username() == new_candidate.username() &&
|
|
remote_candidate_.password() == new_candidate.password() &&
|
|
remote_candidate_.generation() == new_candidate.generation()) {
|
|
remote_candidate_ = new_candidate;
|
|
}
|
|
}
|
|
|
|
int64_t Connection::last_received() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return std::max(last_data_received_,
|
|
std::max(last_ping_received_, last_ping_response_received_));
|
|
}
|
|
|
|
int64_t Connection::receiving_unchanged_since() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return receiving_unchanged_since_;
|
|
}
|
|
|
|
uint32_t Connection::prflx_priority() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
// PRIORITY Attribute.
|
|
// Changing the type preference to Peer Reflexive and local preference
|
|
// and component id information is unchanged from the original priority.
|
|
// priority = (2^24)*(type preference) +
|
|
// (2^8)*(local preference) +
|
|
// (2^0)*(256 - component ID)
|
|
IcePriorityValue type_preference =
|
|
(local_candidate_.protocol() == TCP_PROTOCOL_NAME)
|
|
? ICE_TYPE_PREFERENCE_PRFLX_TCP
|
|
: ICE_TYPE_PREFERENCE_PRFLX;
|
|
return type_preference << 24 | (local_candidate_.priority() & 0x00FFFFFF);
|
|
}
|
|
|
|
ConnectionInfo Connection::stats() {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
stats_.recv_bytes_second = round(recv_rate_tracker_.ComputeRate());
|
|
stats_.recv_total_bytes = recv_rate_tracker_.TotalSampleCount();
|
|
stats_.sent_bytes_second = round(send_rate_tracker_.ComputeRate());
|
|
stats_.sent_total_bytes = send_rate_tracker_.TotalSampleCount();
|
|
stats_.receiving = receiving_;
|
|
stats_.writable = write_state_ == STATE_WRITABLE;
|
|
stats_.timeout = write_state_ == STATE_WRITE_TIMEOUT;
|
|
stats_.rtt = rtt_;
|
|
stats_.key = this;
|
|
stats_.state = state_;
|
|
if (port_) {
|
|
stats_.priority = priority();
|
|
stats_.local_candidate = local_candidate();
|
|
}
|
|
stats_.nominated = nominated();
|
|
stats_.total_round_trip_time_ms = total_round_trip_time_ms_;
|
|
stats_.current_round_trip_time_ms = current_round_trip_time_ms_;
|
|
stats_.remote_candidate = remote_candidate();
|
|
return stats_;
|
|
}
|
|
|
|
void Connection::MaybeUpdateLocalCandidate(StunRequest* request,
|
|
StunMessage* response) {
|
|
if (!port_)
|
|
return;
|
|
|
|
// RFC 5245
|
|
// The agent checks the mapped address from the STUN response. If the
|
|
// transport address does not match any of the local candidates that the
|
|
// agent knows about, the mapped address represents a new candidate -- a
|
|
// peer reflexive candidate.
|
|
const StunAddressAttribute* addr =
|
|
response->GetAddress(STUN_ATTR_XOR_MAPPED_ADDRESS);
|
|
if (!addr) {
|
|
RTC_LOG(LS_WARNING)
|
|
<< "Connection::OnConnectionRequestResponse - "
|
|
"No MAPPED-ADDRESS or XOR-MAPPED-ADDRESS found in the "
|
|
"stun response message";
|
|
return;
|
|
}
|
|
|
|
for (const Candidate& candidate : port_->Candidates()) {
|
|
if (absl::EndsWith(candidate.address().hostname(), ".reflector")) {
|
|
Candidate testCandidate = candidate;
|
|
testCandidate.set_address(local_candidate_.address());
|
|
if (testCandidate == local_candidate_) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (candidate.address() == addr->GetAddress()) {
|
|
if (local_candidate_ != candidate) {
|
|
RTC_LOG(LS_INFO) << ToString()
|
|
<< ": Updating local candidate type to srflx.";
|
|
local_candidate_ = candidate;
|
|
// SignalStateChange to force a re-sort in P2PTransportChannel as this
|
|
// Connection's local candidate has changed.
|
|
SignalStateChange(this);
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
|
|
// RFC 5245
|
|
// Its priority is set equal to the value of the PRIORITY attribute
|
|
// in the Binding request.
|
|
const StunUInt32Attribute* priority_attr =
|
|
request->msg()->GetUInt32(STUN_ATTR_PRIORITY);
|
|
if (!priority_attr) {
|
|
RTC_LOG(LS_WARNING) << "Connection::OnConnectionRequestResponse - "
|
|
"No STUN_ATTR_PRIORITY found in the "
|
|
"stun response message";
|
|
return;
|
|
}
|
|
const uint32_t priority = priority_attr->value();
|
|
std::string id = rtc::CreateRandomString(8);
|
|
|
|
// Create a peer-reflexive candidate based on the local candidate.
|
|
local_candidate_.set_id(id);
|
|
local_candidate_.set_type(PRFLX_PORT_TYPE);
|
|
// Set the related address and foundation attributes before changing the
|
|
// address.
|
|
local_candidate_.set_related_address(local_candidate_.address());
|
|
local_candidate_.set_foundation(port()->ComputeFoundation(
|
|
PRFLX_PORT_TYPE, local_candidate_.protocol(),
|
|
local_candidate_.relay_protocol(), local_candidate_.address()));
|
|
local_candidate_.set_priority(priority);
|
|
local_candidate_.set_address(addr->GetAddress());
|
|
|
|
// Change the local candidate of this Connection to the new prflx candidate.
|
|
RTC_LOG(LS_INFO) << ToString() << ": Updating local candidate type to prflx.";
|
|
port_->AddPrflxCandidate(local_candidate_);
|
|
|
|
// SignalStateChange to force a re-sort in P2PTransportChannel as this
|
|
// Connection's local candidate has changed.
|
|
SignalStateChange(this);
|
|
}
|
|
|
|
bool Connection::rtt_converged() const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
return rtt_samples_ > (RTT_RATIO + 1);
|
|
}
|
|
|
|
bool Connection::missing_responses(int64_t now) const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
if (pings_since_last_response_.empty()) {
|
|
return false;
|
|
}
|
|
|
|
int64_t waiting = now - pings_since_last_response_[0].sent_time;
|
|
return waiting > 2 * rtt();
|
|
}
|
|
|
|
bool Connection::TooManyOutstandingPings(
|
|
const absl::optional<int>& max_outstanding_pings) const {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
if (!max_outstanding_pings.has_value()) {
|
|
return false;
|
|
}
|
|
if (static_cast<int>(pings_since_last_response_.size()) <
|
|
*max_outstanding_pings) {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void Connection::SetLocalCandidateNetworkCost(uint16_t cost) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
|
|
if (cost == local_candidate_.network_cost())
|
|
return;
|
|
|
|
local_candidate_.set_network_cost(cost);
|
|
|
|
// Network cost change will affect the connection selection criteria.
|
|
// Signal the connection state change to force a re-sort in
|
|
// P2PTransportChannel.
|
|
SignalStateChange(this);
|
|
}
|
|
|
|
bool Connection::ShouldSendGoogPing(const StunMessage* message) {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
if (remote_support_goog_ping_ == true && cached_stun_binding_ &&
|
|
cached_stun_binding_->EqualAttributes(message, [](int type) {
|
|
// Ignore these attributes.
|
|
// NOTE: Consider what to do if adding more content to
|
|
// STUN_ATTR_GOOG_MISC_INFO
|
|
return type != STUN_ATTR_FINGERPRINT &&
|
|
type != STUN_ATTR_MESSAGE_INTEGRITY &&
|
|
type != STUN_ATTR_RETRANSMIT_COUNT &&
|
|
type != STUN_ATTR_GOOG_MISC_INFO;
|
|
})) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void Connection::ForgetLearnedState() {
|
|
RTC_DCHECK_RUN_ON(network_thread_);
|
|
RTC_LOG(LS_INFO) << ToString() << ": Connection forget learned state";
|
|
requests_.Clear();
|
|
receiving_ = false;
|
|
write_state_ = STATE_WRITE_INIT;
|
|
rtt_estimate_.Reset();
|
|
pings_since_last_response_.clear();
|
|
}
|
|
|
|
ProxyConnection::ProxyConnection(rtc::WeakPtr<Port> port,
|
|
size_t index,
|
|
const Candidate& remote_candidate)
|
|
: Connection(std::move(port), index, remote_candidate) {}
|
|
|
|
int ProxyConnection::Send(const void* data,
|
|
size_t size,
|
|
const rtc::PacketOptions& options) {
|
|
if (!port_)
|
|
return SOCKET_ERROR;
|
|
|
|
stats_.sent_total_packets++;
|
|
int sent =
|
|
port_->SendTo(data, size, remote_candidate_.address(), options, true);
|
|
int64_t now = rtc::TimeMillis();
|
|
if (sent <= 0) {
|
|
RTC_DCHECK(sent < 0);
|
|
error_ = port_->GetError();
|
|
stats_.sent_discarded_packets++;
|
|
stats_.sent_discarded_bytes += size;
|
|
} else {
|
|
send_rate_tracker_.AddSamplesAtTime(now, sent);
|
|
}
|
|
last_send_data_ = now;
|
|
return sent;
|
|
}
|
|
|
|
int ProxyConnection::GetError() {
|
|
return error_;
|
|
}
|
|
|
|
} // namespace cricket
|