forked from quic-go/quic-go
292 lines
12 KiB
Go
292 lines
12 KiB
Go
package handshake
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import (
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"bytes"
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"sync"
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"time"
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"github.com/lucas-clemente/quic-go/internal/utils"
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"github.com/lucas-clemente/quic-go/protocol"
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"github.com/lucas-clemente/quic-go/qerr"
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)
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// ConnectionParametersManager negotiates and stores the connection parameters
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// A ConnectionParametersManager can be used for a server as well as a client
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// For the server:
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// 1. call SetFromMap with the values received in the CHLO. This sets the corresponding values here, subject to negotiation
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// 2. call GetHelloMap to get the values to send in the SHLO
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// For the client:
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// 1. call GetHelloMap to get the values to send in a CHLO
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// 2. call SetFromMap with the values received in the SHLO
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type ConnectionParametersManager interface {
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SetFromMap(map[Tag][]byte) error
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GetHelloMap() (map[Tag][]byte, error)
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GetSendStreamFlowControlWindow() protocol.ByteCount
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GetSendConnectionFlowControlWindow() protocol.ByteCount
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GetReceiveStreamFlowControlWindow() protocol.ByteCount
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GetMaxReceiveStreamFlowControlWindow() protocol.ByteCount
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GetReceiveConnectionFlowControlWindow() protocol.ByteCount
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GetMaxReceiveConnectionFlowControlWindow() protocol.ByteCount
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GetMaxOutgoingStreams() uint32
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GetMaxIncomingStreams() uint32
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GetIdleConnectionStateLifetime() time.Duration
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TruncateConnectionID() bool
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}
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type connectionParametersManager struct {
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mutex sync.RWMutex
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version protocol.VersionNumber
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perspective protocol.Perspective
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flowControlNegotiated bool
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truncateConnectionID bool
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maxStreamsPerConnection uint32
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maxIncomingDynamicStreamsPerConnection uint32
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idleConnectionStateLifetime time.Duration
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sendStreamFlowControlWindow protocol.ByteCount
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sendConnectionFlowControlWindow protocol.ByteCount
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receiveStreamFlowControlWindow protocol.ByteCount
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receiveConnectionFlowControlWindow protocol.ByteCount
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maxReceiveStreamFlowControlWindowServer protocol.ByteCount
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maxReceiveConnectionFlowControlWindowServer protocol.ByteCount
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maxReceiveStreamFlowControlWindowClient protocol.ByteCount
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maxReceiveConnectionFlowControlWindowClient protocol.ByteCount
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}
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var _ ConnectionParametersManager = &connectionParametersManager{}
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// ErrMalformedTag is returned when the tag value cannot be read
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var (
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ErrMalformedTag = qerr.Error(qerr.InvalidCryptoMessageParameter, "malformed Tag value")
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ErrFlowControlRenegotiationNotSupported = qerr.Error(qerr.InvalidCryptoMessageParameter, "renegotiation of flow control parameters not supported")
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)
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// NewConnectionParamatersManager creates a new connection parameters manager
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func NewConnectionParamatersManager(
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pers protocol.Perspective, v protocol.VersionNumber,
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maxReceiveStreamFlowControlWindowServer protocol.ByteCount, maxReceiveConnectionFlowControlWindowServer protocol.ByteCount,
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maxReceiveStreamFlowControlWindowClient protocol.ByteCount, maxReceiveConnectionFlowControlWindowClient protocol.ByteCount,
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) ConnectionParametersManager {
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if maxReceiveStreamFlowControlWindowServer == 0 {
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maxReceiveStreamFlowControlWindowServer = protocol.DefaultMaxReceiveStreamFlowControlWindowServer
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}
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if maxReceiveConnectionFlowControlWindowServer == 0 {
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maxReceiveConnectionFlowControlWindowServer = protocol.DefaultMaxReceiveConnectionFlowControlWindowServer
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}
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if maxReceiveStreamFlowControlWindowClient == 0 {
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maxReceiveStreamFlowControlWindowClient = protocol.DefaultMaxReceiveStreamFlowControlWindowClient
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}
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if maxReceiveConnectionFlowControlWindowClient == 0 {
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maxReceiveConnectionFlowControlWindowClient = protocol.DefaultMaxReceiveConnectionFlowControlWindowClient
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}
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h := &connectionParametersManager{
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perspective: pers,
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version: v,
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sendStreamFlowControlWindow: protocol.InitialStreamFlowControlWindow, // can only be changed by the client
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sendConnectionFlowControlWindow: protocol.InitialConnectionFlowControlWindow, // can only be changed by the client
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receiveStreamFlowControlWindow: protocol.ReceiveStreamFlowControlWindow,
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receiveConnectionFlowControlWindow: protocol.ReceiveConnectionFlowControlWindow,
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maxReceiveStreamFlowControlWindowServer: maxReceiveStreamFlowControlWindowServer,
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maxReceiveConnectionFlowControlWindowServer: maxReceiveConnectionFlowControlWindowServer,
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maxReceiveStreamFlowControlWindowClient: maxReceiveStreamFlowControlWindowClient,
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maxReceiveConnectionFlowControlWindowClient: maxReceiveConnectionFlowControlWindowClient,
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}
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if h.perspective == protocol.PerspectiveServer {
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h.idleConnectionStateLifetime = protocol.DefaultIdleTimeout
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h.maxStreamsPerConnection = protocol.MaxStreamsPerConnection // this is the value negotiated based on what the client sent
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h.maxIncomingDynamicStreamsPerConnection = protocol.MaxStreamsPerConnection // "incoming" seen from the client's perspective
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} else {
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h.idleConnectionStateLifetime = protocol.MaxIdleTimeoutClient
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h.maxStreamsPerConnection = protocol.MaxStreamsPerConnection // this is the value negotiated based on what the client sent
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h.maxIncomingDynamicStreamsPerConnection = protocol.MaxStreamsPerConnection // "incoming" seen from the server's perspective
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}
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return h
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}
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// SetFromMap reads all params
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func (h *connectionParametersManager) SetFromMap(params map[Tag][]byte) error {
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h.mutex.Lock()
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defer h.mutex.Unlock()
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if value, ok := params[TagTCID]; ok && h.perspective == protocol.PerspectiveServer {
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clientValue, err := utils.ReadUint32(bytes.NewBuffer(value))
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if err != nil {
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return ErrMalformedTag
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}
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h.truncateConnectionID = (clientValue == 0)
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}
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if value, ok := params[TagMSPC]; ok {
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clientValue, err := utils.ReadUint32(bytes.NewBuffer(value))
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if err != nil {
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return ErrMalformedTag
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}
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h.maxStreamsPerConnection = h.negotiateMaxStreamsPerConnection(clientValue)
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}
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if value, ok := params[TagMIDS]; ok {
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clientValue, err := utils.ReadUint32(bytes.NewBuffer(value))
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if err != nil {
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return ErrMalformedTag
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}
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h.maxIncomingDynamicStreamsPerConnection = h.negotiateMaxIncomingDynamicStreamsPerConnection(clientValue)
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}
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if value, ok := params[TagICSL]; ok {
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clientValue, err := utils.ReadUint32(bytes.NewBuffer(value))
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if err != nil {
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return ErrMalformedTag
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}
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h.idleConnectionStateLifetime = h.negotiateIdleConnectionStateLifetime(time.Duration(clientValue) * time.Second)
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}
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if value, ok := params[TagSFCW]; ok {
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if h.flowControlNegotiated {
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return ErrFlowControlRenegotiationNotSupported
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}
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sendStreamFlowControlWindow, err := utils.ReadUint32(bytes.NewBuffer(value))
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if err != nil {
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return ErrMalformedTag
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}
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h.sendStreamFlowControlWindow = protocol.ByteCount(sendStreamFlowControlWindow)
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}
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if value, ok := params[TagCFCW]; ok {
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if h.flowControlNegotiated {
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return ErrFlowControlRenegotiationNotSupported
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}
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sendConnectionFlowControlWindow, err := utils.ReadUint32(bytes.NewBuffer(value))
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if err != nil {
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return ErrMalformedTag
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}
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h.sendConnectionFlowControlWindow = protocol.ByteCount(sendConnectionFlowControlWindow)
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}
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_, containsSFCW := params[TagSFCW]
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_, containsCFCW := params[TagCFCW]
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if containsCFCW || containsSFCW {
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h.flowControlNegotiated = true
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}
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return nil
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}
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func (h *connectionParametersManager) negotiateMaxStreamsPerConnection(clientValue uint32) uint32 {
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return utils.MinUint32(clientValue, protocol.MaxStreamsPerConnection)
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}
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func (h *connectionParametersManager) negotiateMaxIncomingDynamicStreamsPerConnection(clientValue uint32) uint32 {
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return utils.MinUint32(clientValue, protocol.MaxIncomingDynamicStreamsPerConnection)
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}
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func (h *connectionParametersManager) negotiateIdleConnectionStateLifetime(clientValue time.Duration) time.Duration {
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if h.perspective == protocol.PerspectiveServer {
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return utils.MinDuration(clientValue, protocol.MaxIdleTimeoutServer)
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}
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return utils.MinDuration(clientValue, protocol.MaxIdleTimeoutClient)
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}
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// GetHelloMap gets all parameters needed for the Hello message
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func (h *connectionParametersManager) GetHelloMap() (map[Tag][]byte, error) {
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sfcw := bytes.NewBuffer([]byte{})
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utils.WriteUint32(sfcw, uint32(h.GetReceiveStreamFlowControlWindow()))
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cfcw := bytes.NewBuffer([]byte{})
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utils.WriteUint32(cfcw, uint32(h.GetReceiveConnectionFlowControlWindow()))
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mspc := bytes.NewBuffer([]byte{})
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utils.WriteUint32(mspc, h.maxStreamsPerConnection)
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mids := bytes.NewBuffer([]byte{})
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utils.WriteUint32(mids, protocol.MaxIncomingDynamicStreamsPerConnection)
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icsl := bytes.NewBuffer([]byte{})
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utils.WriteUint32(icsl, uint32(h.GetIdleConnectionStateLifetime()/time.Second))
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return map[Tag][]byte{
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TagICSL: icsl.Bytes(),
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TagMSPC: mspc.Bytes(),
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TagMIDS: mids.Bytes(),
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TagCFCW: cfcw.Bytes(),
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TagSFCW: sfcw.Bytes(),
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}, nil
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}
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// GetSendStreamFlowControlWindow gets the size of the stream-level flow control window for sending data
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func (h *connectionParametersManager) GetSendStreamFlowControlWindow() protocol.ByteCount {
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h.mutex.RLock()
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defer h.mutex.RUnlock()
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return h.sendStreamFlowControlWindow
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}
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// GetSendConnectionFlowControlWindow gets the size of the stream-level flow control window for sending data
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func (h *connectionParametersManager) GetSendConnectionFlowControlWindow() protocol.ByteCount {
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h.mutex.RLock()
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defer h.mutex.RUnlock()
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return h.sendConnectionFlowControlWindow
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}
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// GetReceiveStreamFlowControlWindow gets the size of the stream-level flow control window for receiving data
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func (h *connectionParametersManager) GetReceiveStreamFlowControlWindow() protocol.ByteCount {
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h.mutex.RLock()
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defer h.mutex.RUnlock()
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return h.receiveStreamFlowControlWindow
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}
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// GetMaxReceiveStreamFlowControlWindow gets the maximum size of the stream-level flow control window for sending data
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func (h *connectionParametersManager) GetMaxReceiveStreamFlowControlWindow() protocol.ByteCount {
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if h.perspective == protocol.PerspectiveServer {
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return h.maxReceiveStreamFlowControlWindowServer
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}
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return h.maxReceiveStreamFlowControlWindowClient
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}
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// GetReceiveConnectionFlowControlWindow gets the size of the stream-level flow control window for receiving data
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func (h *connectionParametersManager) GetReceiveConnectionFlowControlWindow() protocol.ByteCount {
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h.mutex.RLock()
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defer h.mutex.RUnlock()
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return h.receiveConnectionFlowControlWindow
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}
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// GetMaxReceiveConnectionFlowControlWindow gets the maximum size of the stream-level flow control window for sending data
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func (h *connectionParametersManager) GetMaxReceiveConnectionFlowControlWindow() protocol.ByteCount {
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if h.perspective == protocol.PerspectiveServer {
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return h.maxReceiveConnectionFlowControlWindowServer
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}
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return h.maxReceiveConnectionFlowControlWindowClient
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}
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// GetMaxOutgoingStreams gets the maximum number of outgoing streams per connection
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func (h *connectionParametersManager) GetMaxOutgoingStreams() uint32 {
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h.mutex.RLock()
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defer h.mutex.RUnlock()
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return h.maxIncomingDynamicStreamsPerConnection
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}
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// GetMaxIncomingStreams get the maximum number of incoming streams per connection
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func (h *connectionParametersManager) GetMaxIncomingStreams() uint32 {
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h.mutex.RLock()
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defer h.mutex.RUnlock()
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maxStreams := protocol.MaxIncomingDynamicStreamsPerConnection
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return utils.MaxUint32(uint32(maxStreams)+protocol.MaxStreamsMinimumIncrement, uint32(float64(maxStreams)*protocol.MaxStreamsMultiplier))
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}
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// GetIdleConnectionStateLifetime gets the idle timeout
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func (h *connectionParametersManager) GetIdleConnectionStateLifetime() time.Duration {
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h.mutex.RLock()
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defer h.mutex.RUnlock()
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return h.idleConnectionStateLifetime
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}
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// TruncateConnectionID determines if the client requests truncated ConnectionIDs
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func (h *connectionParametersManager) TruncateConnectionID() bool {
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if h.perspective == protocol.PerspectiveClient {
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return false
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}
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h.mutex.RLock()
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defer h.mutex.RUnlock()
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return h.truncateConnectionID
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}
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