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A QUIC implementation in Java
/*
* Copyright © 2020, 2021, 2022, 2023, 2024 Peter Doornbosch
*
* This file is part of Kwik, an implementation of the QUIC protocol in Java.
*
* Kwik is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your option)
* any later version.
*
* Kwik is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
* more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see closeCallback;
private final StreamManager streamManager;
private final byte[] token;
private final ConnectionIdManager connectionIdManager;
private volatile String negotiatedApplicationProtocol;
private volatile long bytesReceived;
private volatile boolean addressValidated;
private boolean acceptEarlyData = true;
private boolean acceptedEarlyData = false;
private int allowedClientConnectionIds = 3;
private boolean applicationProtocolStarted;
/**
* Creates a server connection implementation.
*
* @param originalVersion quic version used for this connection
* @param serverSocket the socket that is used for sending packets
* @param initialClientAddress the initial client address (after handshake, clients can move to different address)
* @param peerCid the connection id of the client
* @param originalDcid the original destination connection id used by the client
* @param tlsServerEngineFactory factory for creating tls engine
* @param configuration connection configuration settings
* @param applicationProtocolRegistry the registry for application protocols this server supports
* @param connectionRegistry the registry for server connections
* @param closeCallback callback for notifying interested parties this connection is closed
* @param log logger
*/
public ServerConnectionImpl(Version originalVersion, DatagramSocket serverSocket, InetSocketAddress initialClientAddress,
byte[] peerCid, byte[] originalDcid, TlsServerEngineFactory tlsServerEngineFactory,
ServerConnectionConfig configuration, ApplicationProtocolRegistry applicationProtocolRegistry,
ServerConnectionRegistry connectionRegistry, Consumer closeCallback, Logger log) {
super(originalVersion, Role.Server, null, new LogProxy(log, originalDcid));
this.originalVersion = originalVersion;
this.initialClientAddress = initialClientAddress;
this.retryRequired = configuration.retryRequired() == ServerConnectionConfig.RetryRequired.Always;
this.configuration = configuration;
this.applicationProtocolRegistry = applicationProtocolRegistry;
this.closeCallback = closeCallback;
tlsEngine = tlsServerEngineFactory.createServerEngine(new TlsMessageSender(), this);
tlsEngine.addSupportedCiphers(List.of(
TlsConstants.CipherSuite.TLS_AES_128_GCM_SHA256,
TlsConstants.CipherSuite.TLS_AES_256_GCM_SHA384,
TlsConstants.CipherSuite.TLS_CHACHA20_POLY1305_SHA256
// TlsConstants.CipherSuite.TLS_AES_128_CCM_SHA256 not yet support by Kwik
// TlsConstants.CipherSuite.TLS_AES_128_CCM_8_SHA256 not used in QUIC!
));
idleTimer = new IdleTimer(this, log);
sender = new SenderImpl(quicVersion, getMaxPacketSize(), serverSocket, initialClientAddress,this, Bytes.bytesToHex(originalDcid), configuration.initialRtt(), this.log);
if (! retryRequired) {
sender.setAntiAmplificationLimit(0);
}
idleTimer.setPtoSupplier(sender::getPto);
BiConsumer closeWithErrorFunction = (error, reason) -> {
immediateCloseWithError(EncryptionLevel.App, error, reason);
};
connectionIdManager = new ConnectionIdManager(peerCid, originalDcid, configuration.connectionIdLength(), allowedClientConnectionIds, connectionRegistry, sender, closeWithErrorFunction, log);
ackGenerator = sender.getGlobalAckGenerator();
if (retryRequired) {
random = new SecureRandom();
token = new byte[TOKEN_SIZE];
random.nextBytes(token);
}
else {
random = null;
token = null;
}
connectionSecrets.computeInitialKeys(originalDcid);
sender.start(connectionSecrets);
streamManager = new StreamManager(this, Role.Server, log, configuration);
this.log.getQLog().emitConnectionCreatedEvent(Instant.now());
}
@Override
protected PacketFilter createProcessorChain() {
return new CheckDestinationFilter(
new DropDuplicatePacketsFilter(
new VersionNegotiationConfirmedFilter(
new PostProcessingFilter(
new QlogPacketFilter(
new ClosingOrDrainingFilter(this, log))))));
}
PacketParser createParser() {
return new ServerRolePacketParser(connectionSecrets, quicVersion, getSourceConnectionIdLength(), retryRequired,
processorChain, () -> versionNegotiationStatus, log);
}
@Override
public void abortConnection(Throwable error) {
log.error(this + " aborted due to internal error", error);
closeCallback.accept(this);
}
@Override
protected SenderImpl getSender() {
return sender;
}
@Override
protected TlsEngine getTlsEngine() {
return tlsEngine;
}
@Override
protected GlobalAckGenerator getAckGenerator() {
return ackGenerator;
}
@Override
protected StreamManager getStreamManager() {
return streamManager;
}
@Override
protected ConnectionIdManager getConnectionIdManager() {
return connectionIdManager;
}
@Override
@Deprecated
public long getInitialMaxStreamData() {
return configuration.maxBidirectionalStreamBufferSize();
}
@Override
public int getMaxShortHeaderPacketOverhead() {
return 1 // flag byte
+ connectionIdManager.getCurrentPeerConnectionId().length
+ 4 // max packet number size, in practice this will be mostly 1
+ 16; // encryption overhead
}
@Override
protected int getSourceConnectionIdLength() {
return connectionIdManager.getInitialConnectionId().length;
}
@Override
protected void cryptoProcessingErrorOcurred(Exception exception) {
}
public byte[] getInitialConnectionId() {
return connectionIdManager.getInitialConnectionId();
}
@Override
public byte[] getSourceConnectionId() {
return connectionIdManager.getInitialConnectionId();
}
@Override
public byte[] getDestinationConnectionId() {
return connectionIdManager.getCurrentPeerConnectionId();
}
@Override
public void earlySecretsKnown() {
// https://www.rfc-editor.org/rfc/rfc9369.html#name-compatible-negotiation-requ
// "Servers can accept 0-RTT and then process 0-RTT packets from the original version."
connectionSecrets.computeEarlySecrets(tlsEngine, tlsEngine.getSelectedCipher(), originalVersion);
}
@Override
public void handshakeSecretsKnown() {
connectionSecrets.computeHandshakeSecrets(tlsEngine, tlsEngine.getSelectedCipher());
}
@Override
public void handshakeFinished() {
connectionSecrets.computeApplicationSecrets(tlsEngine);
sender.enableAppLevel();
// https://www.rfc-editor.org/rfc/rfc9001.html#name-discarding-handshake-keys
// "An endpoint MUST discard its handshake keys when the TLS handshake is confirmed"
// https://www.rfc-editor.org/rfc/rfc9001.html#name-handshake-confirmed
// "In this document, the TLS handshake is considered confirmed at the server when the handshake completes."
// https://www.rfc-editor.org/rfc/rfc9001.html#name-handshake-complete
// "In this document, the TLS handshake is considered complete when the TLS stack has reported that the handshake
// is complete. This happens when the TLS stack has both sent a Finished message and verified the peer's Finished message."
sender.discard(PnSpace.Handshake, "tls handshake confirmed");
connectionSecrets.discardKeys(EncryptionLevel.Handshake);
// https://tools.ietf.org/html/draft-ietf-quic-tls-32#section-4.9.2
// "The server MUST send a HANDSHAKE_DONE frame as soon as it completes the handshake."
sendHandshakeDone(new HandshakeDoneFrame(quicVersion.getVersion()));
connectionState = Connected;
synchronized (handshakeStateLock) {
if (handshakeState.transitionAllowed(HandshakeState.Confirmed)) {
handshakeState = HandshakeState.Confirmed;
handshakeStateListeners.forEach(l -> l.handshakeStateChangedEvent(handshakeState));
}
else {
log.debug("Handshake state cannot be set to Confirmed");
}
}
if (!applicationProtocolStarted) {
applicationProtocolRegistry.startApplicationProtocolConnection(negotiatedApplicationProtocol, this);
applicationProtocolStarted = true;
}
connectionIdManager.handshakeFinished();
}
private void sendHandshakeDone(QuicFrame frame) {
send(frame, this::sendHandshakeDone);
}
@Override
public void newSessionTicketReceived(NewSessionTicket ticket) {
}
@Override
public void extensionsReceived(List extensions) throws TlsProtocolException {
// https://tools.ietf.org/html/draft-ietf-quic-tls-32#section-8.1
// "Unless another mechanism is used for agreeing on an application protocol, endpoints MUST use ALPN for this purpose."
Optional alpnExtension = extensions.stream()
.filter(ext -> ext instanceof ApplicationLayerProtocolNegotiationExtension)
.findFirst();
if (alpnExtension.isEmpty()) {
throw new MissingExtensionAlert("missing application layer protocol negotiation extension");
}
else {
// "When using ALPN, endpoints MUST immediately close a connection (...) if an application protocol is not negotiated."
List requestedProtocols = ((ApplicationLayerProtocolNegotiationExtension) alpnExtension.get()).getProtocols();
Optional applicationProtocol = applicationProtocolRegistry.selectSupportedApplicationProtocol(requestedProtocols);
if (applicationProtocol.isPresent()) {
negotiatedApplicationProtocol = applicationProtocol.get();
// Add negotiated protocol to TLS response (Encrypted Extensions message)
tlsEngine.addServerExtensions(new ApplicationLayerProtocolNegotiationExtension(applicationProtocol.get()));
// Determine configuration values based on server preferences and protocol requirements
ApplicationProtocolConnectionFactory apFactory = applicationProtocolRegistry.getApplicationProtocolConnectionFactory(applicationProtocol.get());
configure(apFactory, applicationProtocol.get());
}
else {
throw new NoApplicationProtocolAlert(requestedProtocols);
}
}
// https://tools.ietf.org/html/draft-ietf-quic-tls-32#section-8.2
// "endpoints that receive ClientHello or EncryptedExtensions messages without the quic_transport_parameters extension
// MUST close the connection with an error of type 0x16d (equivalent to a fatal TLS missing_extension alert"
Optional tpExtension = extensions.stream()
.filter(ext -> ext instanceof QuicTransportParametersExtension)
.findFirst();
if (tpExtension.isEmpty()) {
throw new MissingExtensionAlert("missing quic transport parameters extension");
}
else {
try {
validateAndProcess(((QuicTransportParametersExtension) tpExtension.get()).getTransportParameters());
} catch (TransportError transportParameterError) {
throw new TlsProtocolException("transport parameter error", transportParameterError);
}
}
TransportParameters serverTransportParams = initTransportParameters();
// https://www.rfc-editor.org/rfc/rfc9369.html#name-version-negotiation-conside
// "Any QUIC endpoint that supports QUIC version 2 MUST send, process, and validate the version_information
// transport parameter specified in [QUIC-VN] to prevent version downgrade attacks."
serverTransportParams.setVersionInformation(new TransportParameters.VersionInformation(quicVersion.getVersion(), List.of(Version.QUIC_version_1, Version.QUIC_version_2)));
serverTransportParams.setActiveConnectionIdLimit(allowedClientConnectionIds);
serverTransportParams.setDisableMigration(true);
serverTransportParams.setInitialSourceConnectionId(connectionIdManager.getInitialConnectionId());
serverTransportParams.setOriginalDestinationConnectionId(connectionIdManager.getOriginalDestinationConnectionId());
if (retryRequired) {
serverTransportParams.setRetrySourceConnectionId(connectionIdManager.getInitialConnectionId());
}
tlsEngine.setSelectedApplicationLayerProtocol(negotiatedApplicationProtocol);
tlsEngine.addServerExtensions(new QuicTransportParametersExtension(quicVersion.getVersion(), serverTransportParams, Role.Server));
tlsEngine.setSessionData(quicVersion.getVersion().getBytes());
tlsEngine.setSessionDataVerificationCallback(this::acceptSessionResumption);
}
private void configure(ApplicationProtocolSettings alpSettings, String protocol) {
if (alpSettings.maxConcurrentPeerInitiatedUnidirectionalStreams() == ApplicationProtocolSettings.NOT_SPECIFIED) {
log.warn("The ApplicationProtocolConnectionFactory for protocol " + protocol +
" does not define (override) maxConcurrentPeerInitiatedUnidirectionalStreams; this will be required in future versions of Kwik");
}
if (alpSettings.maxConcurrentPeerInitiatedBidirectionalStreams() == ApplicationProtocolSettings.NOT_SPECIFIED) {
log.warn("The ApplicationProtocolConnectionFactory for protocol " + protocol +
" does not define (override) maxConcurrentPeerInitiatedBidirectionalStreams; this will be required in future versions of Kwik");
}
configuration = configuration.merge(alpSettings);
streamManager.initialize(configuration);
}
TransportParameters initTransportParameters() {
TransportParameters parameters = new TransportParameters();
parameters.setMaxIdleTimeout(configuration.maxIdleTimeout());
parameters.setInitialMaxStreamDataBidiLocal(configuration.maxBidirectionalStreamBufferSize());
parameters.setInitialMaxStreamDataBidiRemote(configuration.maxBidirectionalStreamBufferSize());
parameters.setInitialMaxStreamDataUni(configuration.maxUnidirectionalStreamBufferSize());
parameters.setInitialMaxData(configuration.maxConnectionBufferSize());
parameters.setInitialMaxStreamsBidi(configuration.maxOpenPeerInitiatedBidirectionalStreams());
parameters.setInitialMaxStreamsUni(configuration.maxOpenPeerInitiatedUnidirectionalStreams());
return parameters;
}
boolean acceptSessionResumption(ByteBuffer storedSessionData) {
// https://www.rfc-editor.org/rfc/rfc9369.html#name-tls-resumption-and-new_toke
// "Servers MUST validate the originating version of any session ticket or token and not accept one issued from
// a different version."
if (quicVersion.getVersion().equals(Version.parse(storedSessionData.getInt()))) {
return true;
}
else {
log.warn("Resumed session denied because quic versions don't match");
return false;
}
}
@Override
public boolean isEarlyDataAccepted() {
if (acceptEarlyData) {
// Remember that server connection actually accepted early data
acceptedEarlyData = true;
log.info("Server accepted early data");
return true;
}
else {
return false;
}
}
void increaseAntiAmplificationLimit(int increment) {
bytesReceived += increment;
if (! addressValidated) {
sender.setAntiAmplificationLimit(3 * (int) bytesReceived);
}
}
@Override
protected boolean checkDestinationConnectionId(QuicPacket packet) {
byte[] cid = packet.getDestinationConnectionId();
if ((packet instanceof InitialPacket || packet instanceof ZeroRttPacket) && Arrays.equals(cid, getOriginalDestinationConnectionId())) {
return true;
}
else {
return super.checkDestinationConnectionId(packet);
}
}
@Override
public ProcessResult process(InitialPacket packet, Instant time) {
assert(Arrays.equals(packet.getDestinationConnectionId(), connectionIdManager.getInitialConnectionId()) || Arrays.equals(packet.getDestinationConnectionId(), connectionIdManager.getOriginalDestinationConnectionId()));
if (retryRequired) {
if (packet.getToken() == null) {
sendRetry();
connectionSecrets.recomputeInitialKeys(connectionIdManager.getInitialConnectionId());
return ProcessResult.Abort; // No further packet processing (e.g. ack generation).
}
else if (!Arrays.equals(packet.getToken(), token)) {
// https://tools.ietf.org/html/draft-ietf-quic-transport-33#section-8.1.2
// "If a server receives a client Initial that can be unprotected but contains an invalid Retry token,
// (...), the server SHOULD immediately close (Section 10.2) the connection with an INVALID_TOKEN error."
immediateCloseWithError(EncryptionLevel.Initial, INVALID_TOKEN.value, null);
return ProcessResult.Abort;
}
else {
// Receiving a valid token implies address is validated.
addressValidated = true;
sender.unsetAntiAmplificationLimit();
// Valid token, proceed as usual.
processFrames(packet, time);
return ProcessResult.Continue;
}
}
else {
processFrames(packet, time);
return ProcessResult.Continue;
}
}
private void sendRetry() {
RetryPacket retry = new RetryPacket(quicVersion.getVersion(), connectionIdManager.getInitialConnectionId(), getDestinationConnectionId(), getOriginalDestinationConnectionId(), token);
sender.send(retry);
}
@Override
public ProcessResult process(ShortHeaderPacket packet, Instant time) {
connectionIdManager.registerConnectionIdInUse(packet.getDestinationConnectionId());
processFrames(packet, time);
return ProcessResult.Continue;
}
@Override
public ProcessResult process(VersionNegotiationPacket packet, Instant time) {
// Intentionally discarding packet without any action (clients should not send Version Negotiation packets).
return ProcessResult.Abort;
}
@Override
public ProcessResult process(HandshakePacket packet, Instant time) {
if (! addressValidated) {
// https://tools.ietf.org/html/draft-ietf-quic-transport-34#section-8.1
// "In particular, receipt of a packet protected with Handshake keys confirms that the peer successfully processed
// an Initial packet. Once an endpoint has successfully processed a Handshake packet from the peer, it can consider
// the peer address to have been validated."
addressValidated = true;
sender.unsetAntiAmplificationLimit();
}
// https://tools.ietf.org/html/draft-ietf-quic-transport-32#section-17.2.2.1
// "A server stops sending and processing Initial packets when it receives its first Handshake packet. "
sender.discard(PnSpace.Initial, "first handshake packet received"); // Only discards when not yet done.
processFrames(packet, time);
// https://www.rfc-editor.org/rfc/rfc9001.html#name-discarding-initial-keys
// "a server MUST discard Initial keys when it first successfully processes a Handshake packet"
connectionSecrets.discardKeys(EncryptionLevel.Initial);
return ProcessResult.Continue;
}
@Override
public ProcessResult process(RetryPacket packet, Instant time) {
// Intentionally discarding packet without any action (clients should not send Retry packets).
return ProcessResult.Abort;
}
@Override
public ProcessResult process(ZeroRttPacket packet, Instant time) {
if (acceptedEarlyData) {
if (! applicationProtocolStarted) {
applicationProtocolRegistry.startApplicationProtocolConnection(negotiatedApplicationProtocol, this);
applicationProtocolStarted = true;
}
processFrames(packet, time);
}
else {
log.warn("Ignoring 0-RTT packet because server connection does not accept early data.");
}
return ProcessResult.Continue;
}
@Override
public void process(HandshakeDoneFrame handshakeDoneFrame, QuicPacket packet, Instant timeReceived) {
}
@Override
public void process(NewConnectionIdFrame newConnectionIdFrame, QuicPacket packet, Instant timeReceived) {
connectionIdManager.process(newConnectionIdFrame);
}
@Override
public void process(NewTokenFrame newTokenFrame, QuicPacket packet, Instant timeReceived) {
}
@Override
public void process(RetireConnectionIdFrame retireConnectionIdFrame, QuicPacket packet, Instant timeReceived) {
connectionIdManager.process(retireConnectionIdFrame, packet.getDestinationConnectionId());
}
@Override
protected void terminate() {
super.terminate(() -> {
String statsSummary = getStats().toString().replace("\n", " ");
log.info(String.format("Stats for connection %s: %s", Bytes.bytesToHex(connectionIdManager.getInitialConnectionId()), statsSummary));
});
log.getQLog().emitConnectionTerminatedEvent();
closeCallback.accept(this);
}
private void validateAndProcess(TransportParameters transportParameters) throws TransportError {
TransportParameters.VersionInformation versionInformation = transportParameters.getVersionInformation();
if (versionInformation != null) {
Optional clientPreferred = versionInformation.getOtherVersions().stream()
// Filter out versions reserved to exercise version negotiation (0x?a?a?a?a) and unknown versions.
.filter(version -> version.isV1V2()).findFirst();
if (!clientPreferred.equals(Optional.of(quicVersion.getVersion()))) {
log.info(String.format("Switching from initial version %s to client's preferred version %s.", quicVersion, clientPreferred));
versionNegotiationStatus = VersionNegotiationStatus.VersionChangeUnconfirmed;
quicVersion.setVersion(clientPreferred.get());
connectionSecrets.recomputeInitialKeys();
}
}
if (transportParameters.getInitialMaxStreamsBidi() > 0x1000000000000000l) {
throw new TransportError(TRANSPORT_PARAMETER_ERROR);
}
if (transportParameters.getMaxUdpPayloadSize() < 1200) {
throw new TransportError(TRANSPORT_PARAMETER_ERROR);
}
if (transportParameters.getAckDelayExponent() > 20) {
throw new TransportError(TRANSPORT_PARAMETER_ERROR);
}
if (transportParameters.getMaxAckDelay() > 16384) {
throw new TransportError(TRANSPORT_PARAMETER_ERROR);
}
if (transportParameters.getActiveConnectionIdLimit() < 2) {
throw new TransportError(TRANSPORT_PARAMETER_ERROR);
}
if (!connectionIdManager.validateInitialPeerConnectionId(transportParameters.getInitialSourceConnectionId())) {
// https://tools.ietf.org/html/draft-ietf-quic-transport-32#section-7.3
// "An endpoint MUST treat absence of the initial_source_connection_id transport parameter from either
// endpoint (...) as a connection error of type TRANSPORT_PARAMETER_ERROR."
// "An endpoint MUST treat the following as a connection error of type TRANSPORT_PARAMETER_ERROR or
// PROTOCOL_VIOLATION: a mismatch between values received from a peer in these transport parameters and the
// value sent in the corresponding Destination or Source Connection ID fields of Initial packets."
throw new TransportError(TRANSPORT_PARAMETER_ERROR);
}
// https://www.rfc-editor.org/rfc/rfc9000.html#name-transport-parameter-definit
// "A client MUST NOT include any server-only transport parameter: original_destination_connection_id,
// preferred_address, retry_source_connection_id, or stateless_reset_token. A server MUST treat receipt of any
// of these transport parameters as a connection error of type TRANSPORT_PARAMETER_ERROR."
if (transportParameters.getOriginalDestinationConnectionId() != null || transportParameters.getPreferredAddress() != null
|| transportParameters.getRetrySourceConnectionId() != null || transportParameters.getStatelessResetToken() != null) {
throw new TransportError(TRANSPORT_PARAMETER_ERROR);
}
determineIdleTimeout(configuration.maxIdleTimeout(), transportParameters.getMaxIdleTimeout());
connectionIdManager.registerPeerCidLimit(transportParameters.getActiveConnectionIdLimit());
flowController = new FlowControl(Role.Server, transportParameters.getInitialMaxData(),
transportParameters.getInitialMaxStreamDataBidiLocal(), transportParameters.getInitialMaxStreamDataBidiRemote(),
transportParameters.getInitialMaxStreamDataUni(), log);
streamManager.setFlowController(flowController);
processCommonTransportParameters(transportParameters);
}
@Override
public InetAddress getInitialClientAddress() {
return initialClientAddress.getAddress();
}
private class TlsMessageSender implements ServerMessageSender {
@Override
public void send(ServerHello sh) {
CryptoStream cryptoStream = getCryptoStream(EncryptionLevel.Initial);
cryptoStream.write(sh, false);
log.sentPacketInfo(cryptoStream.toStringSent());
}
@Override
public void send(EncryptedExtensions ee) {
getCryptoStream(EncryptionLevel.Handshake).write(ee, false);
}
@Override
public void send(CertificateMessage cm) throws IOException {
getCryptoStream(EncryptionLevel.Handshake).write(cm, false);
}
@Override
public void send(CertificateVerifyMessage cv) throws IOException {
getCryptoStream(EncryptionLevel.Handshake).write(cv, false);
}
@Override
public void send(FinishedMessage finished) throws IOException {
CryptoStream cryptoStream = getCryptoStream(EncryptionLevel.Handshake);
cryptoStream.write(finished, false);
log.sentPacketInfo(cryptoStream.toStringSent());
}
@Override
public void send(NewSessionTicketMessage newSessionTicket) throws IOException {
CryptoStream cryptoStream = getCryptoStream(EncryptionLevel.App);
cryptoStream.write(newSessionTicket, true);
}
}
public boolean isClosed() {
return connectionState == Status.Closed;
}
public byte[] getOriginalDestinationConnectionId() {
return connectionIdManager.getOriginalDestinationConnectionId();
}
public List getActiveConnectionIds() {
return connectionIdManager.getActiveConnectionIds();
}
@Override
public void setMaxAllowedBidirectionalStreams(int max) {
throw new UnsupportedOperationException("Not implemented for server connection."
+ "If you really need this functionality, create an issue at https://github.com/ptrd/kwik/issues");
}
@Override
public void setMaxAllowedUnidirectionalStreams(int max) {
throw new UnsupportedOperationException("Not implemented for server connection."
+ "If you really need this functionality, create an issue at https://github.com/ptrd/kwik/issues");
}
@Override
public void setDefaultStreamReceiveBufferSize(long size) {
setDefaultUnidirectionalStreamReceiveBufferSize(size);
setDefaultBidirectionalStreamReceiveBufferSize(size);
}
@Override
public void setDefaultUnidirectionalStreamReceiveBufferSize(long size) {
assert applicationProtocolStarted;
if (size < 1024) {
throw new IllegalArgumentException("Buffer size must be at least 1024");
}
if (size > configuration.maxConnectionBufferSize()) {
throw new IllegalArgumentException("Buffer size cannot be larger than connection buffer size");
}
streamManager.setDefaultUnidirectionalStreamReceiveBufferSize(size);
}
@Override
public void setDefaultBidirectionalStreamReceiveBufferSize(long size) {
assert applicationProtocolStarted;
if (size < 1024) {
throw new IllegalArgumentException("Buffer size must be at least 1024");
}
if (size > configuration.maxConnectionBufferSize()) {
throw new IllegalArgumentException("Buffer size cannot be larger than connection buffer size");
}
streamManager.setDefaultBidirectionalStreamReceiveBufferSize(size);
}
@Override
public void setPeerInitiatedStreamCallback(Consumer streamConsumer) {
streamManager.setPeerInitiatedStreamCallback(streamConsumer);
}
@Override
public String toString() {
return "ServerConnection["
+ Bytes.bytesToHex(connectionIdManager.getOriginalDestinationConnectionId())
+ "/" + Bytes.bytesToHex(connectionIdManager.getInitialConnectionId())
+ "(" + getQuicVersion() + ")"
+ " " + initialClientAddress
+ "]";
}
class VersionNegotiationConfirmedFilter extends BasePacketFilter {
public VersionNegotiationConfirmedFilter(PacketFilter next) {
super(next);
}
@Override
public void processPacket(QuicPacket packet, PacketMetaData metaData) {
if (versionNegotiationStatus == VersionChangeUnconfirmed) {
if (packet.getVersion().equals(quicVersion.getVersion())) {
versionNegotiationStatus = VersionNegotiationStatus.VersionNegotiated;
}
}
next(packet, metaData);
}
}
}