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server.go
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server.go
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package server
import (
"context"
"crypto/tls"
"net/http"
"sync"
"github.com/apernet/quic-go"
"github.com/apernet/quic-go/http3"
"github.com/apernet/hysteria/core/v2/internal/congestion"
"github.com/apernet/hysteria/core/v2/internal/protocol"
"github.com/apernet/hysteria/core/v2/internal/utils"
)
const (
closeErrCodeOK = 0x100 // HTTP3 ErrCodeNoError
closeErrCodeTrafficLimitReached = 0x107 // HTTP3 ErrCodeExcessiveLoad
)
type Server interface {
Serve() error
Close() error
}
func NewServer(config *Config) (Server, error) {
if err := config.fill(); err != nil {
return nil, err
}
tlsConfig := http3.ConfigureTLSConfig(&tls.Config{
Certificates: config.TLSConfig.Certificates,
GetCertificate: config.TLSConfig.GetCertificate,
})
quicConfig := &quic.Config{
InitialStreamReceiveWindow: config.QUICConfig.InitialStreamReceiveWindow,
MaxStreamReceiveWindow: config.QUICConfig.MaxStreamReceiveWindow,
InitialConnectionReceiveWindow: config.QUICConfig.InitialConnectionReceiveWindow,
MaxConnectionReceiveWindow: config.QUICConfig.MaxConnectionReceiveWindow,
MaxIdleTimeout: config.QUICConfig.MaxIdleTimeout,
MaxIncomingStreams: config.QUICConfig.MaxIncomingStreams,
DisablePathMTUDiscovery: config.QUICConfig.DisablePathMTUDiscovery,
EnableDatagrams: true,
}
listener, err := quic.Listen(config.Conn, tlsConfig, quicConfig)
if err != nil {
_ = config.Conn.Close()
return nil, err
}
return &serverImpl{
config: config,
listener: listener,
}, nil
}
type serverImpl struct {
config *Config
listener *quic.Listener
}
func (s *serverImpl) Serve() error {
for {
conn, err := s.listener.Accept(context.Background())
if err != nil {
return err
}
go s.handleClient(conn)
}
}
func (s *serverImpl) Close() error {
err := s.listener.Close()
_ = s.config.Conn.Close()
return err
}
func (s *serverImpl) handleClient(conn quic.Connection) {
handler := newH3sHandler(s.config, conn)
h3s := http3.Server{
Handler: handler,
StreamHijacker: handler.ProxyStreamHijacker,
}
err := h3s.ServeQUICConn(conn)
// If the client is authenticated, we need to log the disconnect event
if handler.authenticated {
if tl := s.config.TrafficLogger; tl != nil {
tl.LogOnlineState(handler.authID, false)
}
if el := s.config.EventLogger; el != nil {
el.Disconnect(conn.RemoteAddr(), handler.authID, err)
}
}
_ = conn.CloseWithError(closeErrCodeOK, "")
}
type h3sHandler struct {
config *Config
conn quic.Connection
authenticated bool
authMutex sync.Mutex
authID string
udpSM *udpSessionManager // Only set after authentication
}
func newH3sHandler(config *Config, conn quic.Connection) *h3sHandler {
return &h3sHandler{
config: config,
conn: conn,
}
}
func (h *h3sHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.Method == http.MethodPost && r.Host == protocol.URLHost && r.URL.Path == protocol.URLPath {
h.authMutex.Lock()
defer h.authMutex.Unlock()
if h.authenticated {
// Already authenticated
protocol.AuthResponseToHeader(w.Header(), protocol.AuthResponse{
UDPEnabled: !h.config.DisableUDP,
Rx: h.config.BandwidthConfig.MaxRx,
RxAuto: h.config.IgnoreClientBandwidth,
})
w.WriteHeader(protocol.StatusAuthOK)
return
}
authReq := protocol.AuthRequestFromHeader(r.Header)
actualTx := authReq.Rx
ok, id := h.config.Authenticator.Authenticate(h.conn.RemoteAddr(), authReq.Auth, actualTx)
if ok {
// Set authenticated flag
h.authenticated = true
h.authID = id
if h.config.IgnoreClientBandwidth {
// Ignore client bandwidth, always use BBR
congestion.UseBBR(h.conn)
actualTx = 0
} else {
// actualTx = min(serverTx, clientRx)
if h.config.BandwidthConfig.MaxTx > 0 && actualTx > h.config.BandwidthConfig.MaxTx {
// We have a maxTx limit and the client is asking for more than that,
// return and use the limit instead
actualTx = h.config.BandwidthConfig.MaxTx
}
if actualTx > 0 {
congestion.UseBrutal(h.conn, actualTx)
} else {
// Client doesn't know its own bandwidth, use BBR
congestion.UseBBR(h.conn)
}
}
// Auth OK, send response
protocol.AuthResponseToHeader(w.Header(), protocol.AuthResponse{
UDPEnabled: !h.config.DisableUDP,
Rx: h.config.BandwidthConfig.MaxRx,
RxAuto: h.config.IgnoreClientBandwidth,
})
w.WriteHeader(protocol.StatusAuthOK)
// Call event logger
if tl := h.config.TrafficLogger; tl != nil {
tl.LogOnlineState(id, true)
}
if el := h.config.EventLogger; el != nil {
el.Connect(h.conn.RemoteAddr(), id, actualTx)
}
// Initialize UDP session manager (if UDP is enabled)
// We use sync.Once to make sure that only one goroutine is started,
// as ServeHTTP may be called by multiple goroutines simultaneously
if !h.config.DisableUDP {
go func() {
sm := newUDPSessionManager(
&udpIOImpl{h.conn, id, h.config.TrafficLogger, h.config.Outbound},
&udpEventLoggerImpl{h.conn, id, h.config.EventLogger},
h.config.UDPIdleTimeout)
h.udpSM = sm
go sm.Run()
}()
}
} else {
// Auth failed, pretend to be a normal HTTP server
h.masqHandler(w, r)
}
} else {
// Not an auth request, pretend to be a normal HTTP server
h.masqHandler(w, r)
}
}
func (h *h3sHandler) ProxyStreamHijacker(ft http3.FrameType, id quic.ConnectionTracingID, stream quic.Stream, err error) (bool, error) {
if err != nil || !h.authenticated {
return false, nil
}
// Wraps the stream with QStream, which handles Close() properly
stream = &utils.QStream{Stream: stream}
switch ft {
case protocol.FrameTypeTCPRequest:
go h.handleTCPRequest(stream)
return true, nil
default:
return false, nil
}
}
func (h *h3sHandler) handleTCPRequest(stream quic.Stream) {
// Read request
reqAddr, err := protocol.ReadTCPRequest(stream)
if err != nil {
_ = stream.Close()
return
}
// Log the event
if h.config.EventLogger != nil {
h.config.EventLogger.TCPRequest(h.conn.RemoteAddr(), h.authID, reqAddr)
}
// Dial target
tConn, err := h.config.Outbound.TCP(reqAddr)
if err != nil {
_ = protocol.WriteTCPResponse(stream, false, err.Error())
_ = stream.Close()
// Log the error
if h.config.EventLogger != nil {
h.config.EventLogger.TCPError(h.conn.RemoteAddr(), h.authID, reqAddr, err)
}
return
}
_ = protocol.WriteTCPResponse(stream, true, "")
// Start proxying
if h.config.TrafficLogger != nil {
err = copyTwoWayWithLogger(h.authID, stream, tConn, h.config.TrafficLogger)
} else {
// Use the fast path if no traffic logger is set
err = copyTwoWay(stream, tConn)
}
if h.config.EventLogger != nil {
h.config.EventLogger.TCPError(h.conn.RemoteAddr(), h.authID, reqAddr, err)
}
// Cleanup
_ = tConn.Close()
_ = stream.Close()
// Disconnect the client if TrafficLogger requested
if err == errDisconnect {
_ = h.conn.CloseWithError(closeErrCodeTrafficLimitReached, "")
}
}
func (h *h3sHandler) masqHandler(w http.ResponseWriter, r *http.Request) {
if h.config.MasqHandler != nil {
h.config.MasqHandler.ServeHTTP(w, r)
} else {
// Return 404 for everything
http.NotFound(w, r)
}
}
// udpIOImpl is the IO implementation for udpSessionManager with TrafficLogger support
type udpIOImpl struct {
Conn quic.Connection
AuthID string
TrafficLogger TrafficLogger
Outbound Outbound
}
func (io *udpIOImpl) ReceiveMessage() (*protocol.UDPMessage, error) {
for {
msg, err := io.Conn.ReceiveDatagram(context.Background())
if err != nil {
// Connection error, this will stop the session manager
return nil, err
}
udpMsg, err := protocol.ParseUDPMessage(msg)
if err != nil {
// Invalid message, this is fine - just wait for the next
continue
}
if io.TrafficLogger != nil {
ok := io.TrafficLogger.LogTraffic(io.AuthID, uint64(len(udpMsg.Data)), 0)
if !ok {
// TrafficLogger requested to disconnect the client
_ = io.Conn.CloseWithError(closeErrCodeTrafficLimitReached, "")
return nil, errDisconnect
}
}
return udpMsg, nil
}
}
func (io *udpIOImpl) SendMessage(buf []byte, msg *protocol.UDPMessage) error {
if io.TrafficLogger != nil {
ok := io.TrafficLogger.LogTraffic(io.AuthID, 0, uint64(len(msg.Data)))
if !ok {
// TrafficLogger requested to disconnect the client
_ = io.Conn.CloseWithError(closeErrCodeTrafficLimitReached, "")
return errDisconnect
}
}
msgN := msg.Serialize(buf)
if msgN < 0 {
// Message larger than buffer, silent drop
return nil
}
return io.Conn.SendDatagram(buf[:msgN])
}
func (io *udpIOImpl) UDP(reqAddr string) (UDPConn, error) {
return io.Outbound.UDP(reqAddr)
}
type udpEventLoggerImpl struct {
Conn quic.Connection
AuthID string
EventLogger EventLogger
}
func (l *udpEventLoggerImpl) New(sessionID uint32, reqAddr string) {
if l.EventLogger != nil {
l.EventLogger.UDPRequest(l.Conn.RemoteAddr(), l.AuthID, sessionID, reqAddr)
}
}
func (l *udpEventLoggerImpl) Close(sessionID uint32, err error) {
if l.EventLogger != nil {
l.EventLogger.UDPError(l.Conn.RemoteAddr(), l.AuthID, sessionID, err)
}
}