131 lines
2.6 KiB
Go
131 lines
2.6 KiB
Go
package quic
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import (
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"context"
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"math"
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"math/rand"
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"net"
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"sync"
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"time"
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"github.com/go-gost/core/dialer"
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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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icmp_pkg "github.com/go-gost/x/internal/util/icmp"
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"github.com/go-gost/x/registry"
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"github.com/quic-go/quic-go"
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"golang.org/x/net/icmp"
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)
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func init() {
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registry.DialerRegistry().Register("icmp", NewDialer)
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}
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type icmpDialer 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 &icmpDialer{
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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 *icmpDialer) 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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func (d *icmpDialer) Dial(ctx context.Context, addr string, opts ...dialer.DialOption) (conn net.Conn, err error) {
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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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raddr, 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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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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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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var pc net.PacketConn
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pc, err = icmp.ListenPacket("ip4:icmp", "")
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if err != nil {
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return
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}
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id := raddr.Port
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if id == 0 {
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id = rand.New(rand.NewSource(time.Now().UnixNano())).Intn(math.MaxUint16) + 1
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raddr.Port = id
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}
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pc = icmp_pkg.ClientConn(pc, id)
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session, err = d.initSession(ctx, raddr, pc)
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if err != nil {
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d.logger.Error(err)
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pc.Close()
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return nil, err
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}
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d.sessions[addr] = session
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}
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conn, err = session.GetConn()
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if err != nil {
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session.Close()
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delete(d.sessions, addr)
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return nil, err
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}
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return
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}
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func (d *icmpDialer) initSession(ctx context.Context, addr net.Addr, conn net.PacketConn) (*quicSession, error) {
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quicConfig := &quic.Config{
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KeepAlivePeriod: d.md.keepAlivePeriod,
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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.Version2,
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},
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}
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tlsCfg := d.options.TLSConfig
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tlsCfg.NextProtos = []string{"h3", "quic/v1"}
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session, err := quic.DialEarly(ctx, conn, addr, tlsCfg, quicConfig)
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if err != nil {
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return nil, err
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}
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return &quicSession{session: session}, nil
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}
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// Multiplex implements dialer.Multiplexer interface.
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func (d *icmpDialer) Multiplex() bool {
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return true
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}
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