152 lines
2.9 KiB
Go
152 lines
2.9 KiB
Go
package quic
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import (
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"context"
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"net"
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"github.com/go-gost/core/listener"
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"github.com/go-gost/core/logger"
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md "github.com/go-gost/core/metadata"
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metrics "github.com/go-gost/core/metrics/wrapper"
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quic_util "github.com/go-gost/x/internal/util/quic"
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"github.com/go-gost/x/registry"
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"github.com/lucas-clemente/quic-go"
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)
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func init() {
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registry.ListenerRegistry().Register("quic", NewListener)
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}
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type quicListener struct {
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ln quic.Listener
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cqueue chan net.Conn
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errChan chan error
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logger logger.Logger
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md metadata
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options listener.Options
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}
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func NewListener(opts ...listener.Option) listener.Listener {
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options := listener.Options{}
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for _, opt := range opts {
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opt(&options)
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}
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return &quicListener{
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logger: options.Logger,
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options: options,
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}
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}
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func (l *quicListener) Init(md md.Metadata) (err error) {
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if err = l.parseMetadata(md); err != nil {
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return
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}
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addr := l.options.Addr
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if _, _, err := net.SplitHostPort(addr); err != nil {
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addr = net.JoinHostPort(addr, "0")
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}
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var laddr *net.UDPAddr
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laddr, err = net.ResolveUDPAddr("udp", addr)
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if err != nil {
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return
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}
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var conn net.PacketConn
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conn, err = net.ListenUDP("udp", laddr)
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if err != nil {
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return
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}
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if l.md.cipherKey != nil {
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conn = quic_util.CipherPacketConn(conn, l.md.cipherKey)
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}
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config := &quic.Config{
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KeepAlive: l.md.keepAlive,
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HandshakeIdleTimeout: l.md.handshakeTimeout,
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MaxIdleTimeout: l.md.maxIdleTimeout,
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Versions: []quic.VersionNumber{
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quic.Version1,
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quic.VersionDraft29,
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},
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}
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tlsCfg := l.options.TLSConfig
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tlsCfg.NextProtos = []string{"http/3", "quic/v1"}
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ln, err := quic.Listen(conn, tlsCfg, config)
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if err != nil {
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return
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}
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l.ln = ln
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l.cqueue = make(chan net.Conn, l.md.backlog)
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l.errChan = make(chan error, 1)
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go l.listenLoop()
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return
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}
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func (l *quicListener) Accept() (conn net.Conn, err error) {
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var ok bool
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select {
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case conn = <-l.cqueue:
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conn = metrics.WrapConn(l.options.Service, conn)
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case err, ok = <-l.errChan:
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if !ok {
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err = listener.ErrClosed
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}
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}
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return
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}
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func (l *quicListener) Close() error {
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return l.ln.Close()
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}
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func (l *quicListener) Addr() net.Addr {
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return l.ln.Addr()
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}
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func (l *quicListener) listenLoop() {
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for {
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ctx := context.Background()
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session, err := l.ln.Accept(ctx)
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if err != nil {
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l.logger.Error("accept:", err)
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l.errChan <- err
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close(l.errChan)
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return
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}
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go l.mux(ctx, session)
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}
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}
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func (l *quicListener) mux(ctx context.Context, session quic.Session) {
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defer session.CloseWithError(0, "closed")
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for {
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stream, err := session.AcceptStream(ctx)
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if err != nil {
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l.logger.Error("accept stream:", err)
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return
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}
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conn := &quicConn{
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Stream: stream,
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laddr: session.LocalAddr(),
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raddr: session.RemoteAddr(),
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}
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select {
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case l.cqueue <- conn:
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case <-stream.Context().Done():
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stream.Close()
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default:
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stream.Close()
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l.logger.Warnf("connection queue is full, client %s discarded", session.RemoteAddr())
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}
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}
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}
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