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// Copyright (c) 2015 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 "net/third_party/quiche/src/quic/tools/quic_client_base.h"
#include "net/third_party/quiche/src/quic/core/crypto/quic_random.h"
#include "net/third_party/quiche/src/quic/core/http/spdy_utils.h"
#include "net/third_party/quiche/src/quic/core/quic_server_id.h"
#include "net/third_party/quiche/src/quic/core/quic_utils.h"
#include "net/third_party/quiche/src/quic/core/tls_client_handshaker.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_flags.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_logging.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_text_utils.h"
namespace quic {
QuicClientBase::NetworkHelper::~NetworkHelper() = default;
QuicClientBase::QuicClientBase(
const QuicServerId& server_id,
const ParsedQuicVersionVector& supported_versions,
const QuicConfig& config,
QuicConnectionHelperInterface* helper,
QuicAlarmFactory* alarm_factory,
std::unique_ptr<NetworkHelper> network_helper,
std::unique_ptr<ProofVerifier> proof_verifier)
: server_id_(server_id),
initialized_(false),
local_port_(0),
config_(config),
crypto_config_(std::move(proof_verifier),
TlsClientHandshaker::CreateSslCtx()),
helper_(helper),
alarm_factory_(alarm_factory),
supported_versions_(supported_versions),
initial_max_packet_length_(0),
num_stateless_rejects_received_(0),
num_sent_client_hellos_(0),
connection_error_(QUIC_NO_ERROR),
connected_or_attempting_connect_(false),
network_helper_(std::move(network_helper)) {}
QuicClientBase::~QuicClientBase() = default;
bool QuicClientBase::Initialize() {
num_sent_client_hellos_ = 0;
num_stateless_rejects_received_ = 0;
connection_error_ = QUIC_NO_ERROR;
connected_or_attempting_connect_ = false;
// If an initial flow control window has not explicitly been set, then use the
// same values that Chrome uses.
const uint32_t kSessionMaxRecvWindowSize = 15 * 1024 * 1024; // 15 MB
const uint32_t kStreamMaxRecvWindowSize = 6 * 1024 * 1024; // 6 MB
if (config()->GetInitialStreamFlowControlWindowToSend() ==
kMinimumFlowControlSendWindow) {
config()->SetInitialStreamFlowControlWindowToSend(kStreamMaxRecvWindowSize);
}
if (config()->GetInitialSessionFlowControlWindowToSend() ==
kMinimumFlowControlSendWindow) {
config()->SetInitialSessionFlowControlWindowToSend(
kSessionMaxRecvWindowSize);
}
if (!network_helper_->CreateUDPSocketAndBind(server_address_,
bind_to_address_, local_port_)) {
return false;
}
initialized_ = true;
return true;
}
bool QuicClientBase::Connect() {
// Attempt multiple connects until the maximum number of client hellos have
// been sent.
while (!connected() &&
GetNumSentClientHellos() <= QuicCryptoClientStream::kMaxClientHellos) {
StartConnect();
while (EncryptionBeingEstablished()) {
WaitForEvents();
}
if (GetQuicReloadableFlag(enable_quic_stateless_reject_support) &&
connected()) {
// Resend any previously queued data.
ResendSavedData();
}
ParsedQuicVersion version = UnsupportedQuicVersion();
if (session() != nullptr &&
session()->error() != QUIC_CRYPTO_HANDSHAKE_STATELESS_REJECT &&
!CanReconnectWithDifferentVersion(&version)) {
// We've successfully created a session but we're not connected, and there
// is no stateless reject to recover from and cannot try to reconnect with
// different version. Give up trying.
break;
}
}
if (!connected() &&
GetNumSentClientHellos() > QuicCryptoClientStream::kMaxClientHellos &&
session() != nullptr &&
session()->error() == QUIC_CRYPTO_HANDSHAKE_STATELESS_REJECT) {
// The overall connection failed due too many stateless rejects.
set_connection_error(QUIC_CRYPTO_TOO_MANY_REJECTS);
}
return session()->connection()->connected();
}
void QuicClientBase::StartConnect() {
DCHECK(initialized_);
DCHECK(!connected());
QuicPacketWriter* writer = network_helper_->CreateQuicPacketWriter();
ParsedQuicVersion mutual_version = UnsupportedQuicVersion();
const bool can_reconnect_with_different_version =
CanReconnectWithDifferentVersion(&mutual_version);
if (connected_or_attempting_connect()) {
// If the last error was not a stateless reject, then the queued up data
// does not need to be resent.
// Keep queued up data if client can try to connect with a different
// version.
if (session()->error() != QUIC_CRYPTO_HANDSHAKE_STATELESS_REJECT &&
!can_reconnect_with_different_version) {
ClearDataToResend();
}
// Before we destroy the last session and create a new one, gather its stats
// and update the stats for the overall connection.
UpdateStats();
}
session_ = CreateQuicClientSession(
supported_versions(),
new QuicConnection(GetNextConnectionId(), server_address(), helper(),
alarm_factory(), writer,
/* owns_writer= */ false, Perspective::IS_CLIENT,
can_reconnect_with_different_version
? ParsedQuicVersionVector{mutual_version}
: supported_versions()));
if (initial_max_packet_length_ != 0) {
session()->connection()->SetMaxPacketLength(initial_max_packet_length_);
}
// Reset |writer()| after |session()| so that the old writer outlives the old
// session.
set_writer(writer);
InitializeSession();
set_connected_or_attempting_connect(true);
}
void QuicClientBase::InitializeSession() {
session()->Initialize();
}
void QuicClientBase::Disconnect() {
DCHECK(initialized_);
initialized_ = false;
if (connected()) {
session()->connection()->CloseConnection(
QUIC_PEER_GOING_AWAY, "Client disconnecting",
ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
}
ClearDataToResend();
network_helper_->CleanUpAllUDPSockets();
}
ProofVerifier* QuicClientBase::proof_verifier() const {
return crypto_config_.proof_verifier();
}
bool QuicClientBase::EncryptionBeingEstablished() {
return !session_->IsEncryptionEstablished() &&
session_->connection()->connected();
}
bool QuicClientBase::WaitForEvents() {
DCHECK(connected());
network_helper_->RunEventLoop();
DCHECK(session() != nullptr);
ParsedQuicVersion version = UnsupportedQuicVersion();
if (!connected() &&
(session()->error() == QUIC_CRYPTO_HANDSHAKE_STATELESS_REJECT ||
CanReconnectWithDifferentVersion(&version))) {
if (session()->error() == QUIC_CRYPTO_HANDSHAKE_STATELESS_REJECT) {
DCHECK(GetQuicReloadableFlag(enable_quic_stateless_reject_support));
QUIC_DLOG(INFO) << "Detected stateless reject while waiting for events. "
<< "Attempting to reconnect.";
} else {
QUIC_DLOG(INFO) << "Can reconnect with version: " << version
<< ", attempting to reconnect.";
}
Connect();
}
return session()->num_active_requests() != 0;
}
bool QuicClientBase::MigrateSocket(const QuicIpAddress& new_host) {
return MigrateSocketWithSpecifiedPort(new_host, local_port_);
}
bool QuicClientBase::MigrateSocketWithSpecifiedPort(
const QuicIpAddress& new_host,
int port) {
if (!connected()) {
return false;
}
network_helper_->CleanUpAllUDPSockets();
set_bind_to_address(new_host);
if (!network_helper_->CreateUDPSocketAndBind(server_address_,
bind_to_address_, port)) {
return false;
}
session()->connection()->SetSelfAddress(
network_helper_->GetLatestClientAddress());
QuicPacketWriter* writer = network_helper_->CreateQuicPacketWriter();
set_writer(writer);
session()->connection()->SetQuicPacketWriter(writer, false);
return true;
}
bool QuicClientBase::ChangeEphemeralPort() {
auto current_host = network_helper_->GetLatestClientAddress().host();
return MigrateSocketWithSpecifiedPort(current_host, 0 /*any ephemeral port*/);
}
QuicSession* QuicClientBase::session() {
return session_.get();
}
QuicClientBase::NetworkHelper* QuicClientBase::network_helper() {
return network_helper_.get();
}
const QuicClientBase::NetworkHelper* QuicClientBase::network_helper() const {
return network_helper_.get();
}
void QuicClientBase::WaitForStreamToClose(QuicStreamId id) {
DCHECK(connected());
while (connected() && !session_->IsClosedStream(id)) {
WaitForEvents();
}
}
bool QuicClientBase::WaitForCryptoHandshakeConfirmed() {
DCHECK(connected());
while (connected() && !session_->IsCryptoHandshakeConfirmed()) {
WaitForEvents();
}
// If the handshake fails due to a timeout, the connection will be closed.
QUIC_LOG_IF(ERROR, !connected()) << "Handshake with server failed.";
return connected();
}
bool QuicClientBase::connected() const {
return session_.get() && session_->connection() &&
session_->connection()->connected();
}
bool QuicClientBase::goaway_received() const {
return session_ != nullptr && session_->goaway_received();
}
int QuicClientBase::GetNumSentClientHellos() {
// If we are not actively attempting to connect, the session object
// corresponds to the previous connection and should not be used.
const int current_session_hellos = !connected_or_attempting_connect_
? 0
: GetNumSentClientHellosFromSession();
return num_sent_client_hellos_ + current_session_hellos;
}
void QuicClientBase::UpdateStats() {
num_sent_client_hellos_ += GetNumSentClientHellosFromSession();
if (session()->error() == QUIC_CRYPTO_HANDSHAKE_STATELESS_REJECT) {
++num_stateless_rejects_received_;
}
}
int QuicClientBase::GetNumReceivedServerConfigUpdates() {
// If we are not actively attempting to connect, the session object
// corresponds to the previous connection and should not be used.
// We do not need to take stateless rejects into account, since we
// don't expect any scup messages to be sent during a
// statelessly-rejected connection.
return !connected_or_attempting_connect_
? 0
: GetNumReceivedServerConfigUpdatesFromSession();
}
QuicErrorCode QuicClientBase::connection_error() const {
// Return the high-level error if there was one. Otherwise, return the
// connection error from the last session.
if (connection_error_ != QUIC_NO_ERROR) {
return connection_error_;
}
if (session_ == nullptr) {
return QUIC_NO_ERROR;
}
return session_->error();
}
QuicConnectionId QuicClientBase::GetNextConnectionId() {
QuicConnectionId server_designated_id = GetNextServerDesignatedConnectionId();
return !server_designated_id.IsEmpty() ? server_designated_id
: GenerateNewConnectionId();
}
QuicConnectionId QuicClientBase::GetNextServerDesignatedConnectionId() {
QuicCryptoClientConfig::CachedState* cached =
crypto_config_.LookupOrCreate(server_id_);
// If the cached state indicates that we should use a server-designated
// connection ID, then return that connection ID.
CHECK(cached != nullptr) << "QuicClientCryptoConfig::LookupOrCreate returned "
<< "unexpected nullptr.";
return cached->has_server_designated_connection_id()
? cached->GetNextServerDesignatedConnectionId()
: EmptyQuicConnectionId();
}
QuicConnectionId QuicClientBase::GenerateNewConnectionId() {
return QuicUtils::CreateRandomConnectionId();
}
bool QuicClientBase::CanReconnectWithDifferentVersion(
ParsedQuicVersion* version) const {
if (session_ == nullptr || session_->connection() == nullptr ||
session_->error() != QUIC_INVALID_VERSION ||
session_->connection()->server_supported_versions().empty()) {
return false;
}
for (const auto& client_version : supported_versions_) {
if (QuicContainsValue(session_->connection()->server_supported_versions(),
client_version)) {
*version = client_version;
return true;
}
}
return false;
}
} // namespace quic