156 lines
3.4 KiB
Go
156 lines
3.4 KiB
Go
package quic
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import (
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"context"
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"errors"
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"net"
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"sync"
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"time"
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"github.com/go-gost/gost/pkg/dialer"
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quic_util "github.com/go-gost/gost/pkg/internal/util/quic"
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"github.com/go-gost/gost/pkg/logger"
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md "github.com/go-gost/gost/pkg/metadata"
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"github.com/go-gost/gost/pkg/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.DialerRegistry().Register("quic", NewDialer)
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}
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type quicDialer struct {
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sessions map[string]*quicSession
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sessionMutex sync.Mutex
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logger logger.Logger
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md metadata
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options dialer.Options
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}
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func NewDialer(opts ...dialer.Option) dialer.Dialer {
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options := dialer.Options{}
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for _, opt := range opts {
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opt(&options)
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}
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return &quicDialer{
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sessions: make(map[string]*quicSession),
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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 (d *quicDialer) Init(md md.Metadata) (err error) {
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if err = d.parseMetadata(md); err != nil {
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return
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}
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return nil
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}
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// Multiplex implements dialer.Multiplexer interface.
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func (d *quicDialer) Multiplex() bool {
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return true
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}
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func (d *quicDialer) Dial(ctx context.Context, addr string, opts ...dialer.DialOption) (conn net.Conn, err error) {
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var options dialer.DialOptions
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for _, opt := range opts {
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opt(&options)
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}
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d.sessionMutex.Lock()
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defer d.sessionMutex.Unlock()
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session, ok := d.sessions[addr]
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if !ok {
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var cc *net.UDPConn
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cc, err = net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4zero, Port: 0})
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if err != nil {
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return
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}
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conn = cc
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if d.md.cipherKey != nil {
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conn = quic_util.CipherConn(cc, d.md.cipherKey)
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}
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session = &quicSession{conn: conn}
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d.sessions[addr] = session
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}
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return session.conn, err
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}
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// Handshake implements dialer.Handshaker
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func (d *quicDialer) Handshake(ctx context.Context, conn net.Conn, options ...dialer.HandshakeOption) (net.Conn, error) {
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opts := &dialer.HandshakeOptions{}
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for _, option := range options {
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option(opts)
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}
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d.sessionMutex.Lock()
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defer d.sessionMutex.Unlock()
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if d.md.handshakeTimeout > 0 {
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conn.SetDeadline(time.Now().Add(d.md.handshakeTimeout))
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defer conn.SetDeadline(time.Time{})
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}
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session, ok := d.sessions[opts.Addr]
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if session != nil && session.conn != conn {
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conn.Close()
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return nil, errors.New("quic: unrecognized connection")
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}
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if !ok || session.session == nil {
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s, err := d.initSession(ctx, opts.Addr, conn)
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if err != nil {
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d.logger.Error(err)
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conn.Close()
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delete(d.sessions, opts.Addr)
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return nil, err
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}
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session = s
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d.sessions[opts.Addr] = session
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}
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cc, err := session.GetConn()
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if err != nil {
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session.Close()
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delete(d.sessions, opts.Addr)
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return nil, err
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}
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return cc, nil
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}
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func (d *quicDialer) initSession(ctx context.Context, addr string, conn net.Conn) (*quicSession, error) {
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pc, ok := conn.(net.PacketConn)
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if !ok {
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return nil, errors.New("quic: wrong connection type")
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}
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udpAddr, err := net.ResolveUDPAddr("udp", addr)
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if err != nil {
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return nil, err
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}
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quicConfig := &quic.Config{
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KeepAlive: d.md.keepAlive,
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HandshakeIdleTimeout: d.md.handshakeTimeout,
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MaxIdleTimeout: d.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 := d.options.TLSConfig
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tlsCfg.NextProtos = []string{"http/3", "quic/v1"}
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session, err := quic.DialContext(ctx, pc, udpAddr, addr, tlsCfg, quicConfig)
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if err != nil {
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d.logger.Error(err)
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return nil, err
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}
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return &quicSession{conn: conn, session: session}, nil
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}
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