mirror of
https://github.com/SagerNet/sing-box.git
synced 2025-04-03 11:57:37 +03:00
89 lines
2.1 KiB
Go
89 lines
2.1 KiB
Go
package derp
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import (
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"context"
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"net"
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"net/netip"
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"time"
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"github.com/sagernet/sing-box/adapter"
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boxService "github.com/sagernet/sing-box/adapter/service"
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"github.com/sagernet/sing-box/common/listener"
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C "github.com/sagernet/sing-box/constant"
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"github.com/sagernet/sing-box/log"
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"github.com/sagernet/sing-box/option"
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E "github.com/sagernet/sing/common/exceptions"
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"github.com/sagernet/sing/common/logger"
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N "github.com/sagernet/sing/common/network"
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"github.com/sagernet/tailscale/net/stun"
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)
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func RegisterSTUN(registry *boxService.Registry) {
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boxService.Register[option.DERPSTUNServiceOptions](registry, C.TypeDERPSTUN, NewSTUNService)
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}
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type STUNService struct {
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boxService.Adapter
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ctx context.Context
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logger logger.ContextLogger
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listener *listener.Listener
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}
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func NewSTUNService(ctx context.Context, logger log.ContextLogger, tag string, options option.DERPSTUNServiceOptions) (adapter.Service, error) {
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return &STUNService{
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Adapter: boxService.NewAdapter(C.TypeDERPSTUN, tag),
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ctx: ctx,
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logger: logger,
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listener: listener.New(listener.Options{
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Context: ctx,
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Logger: logger,
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Network: []string{N.NetworkUDP},
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Listen: options.ListenOptions,
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}),
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}, nil
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}
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func (d *STUNService) Start(stage adapter.StartStage) error {
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if stage != adapter.StartStateStart {
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return nil
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}
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packetConn, err := d.listener.ListenUDP()
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if err != nil {
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return err
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}
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go d.loopPacket(packetConn.(*net.UDPConn))
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return nil
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}
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func (d *STUNService) Close() error {
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return d.listener.Close()
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}
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func (d *STUNService) loopPacket(packetConn *net.UDPConn) {
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buffer := make([]byte, 65535)
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oob := make([]byte, 1024)
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var (
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n int
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oobN int
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addrPort netip.AddrPort
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err error
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)
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for {
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n, oobN, _, addrPort, err = packetConn.ReadMsgUDPAddrPort(buffer, oob)
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if err != nil {
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if E.IsClosedOrCanceled(err) {
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return
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}
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time.Sleep(time.Second)
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continue
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}
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if !stun.Is(buffer[:n]) {
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continue
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}
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txid, err := stun.ParseBindingRequest(buffer[:n])
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if err != nil {
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continue
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}
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packetConn.WriteMsgUDPAddrPort(stun.Response(txid, addrPort), oob[:oobN], addrPort)
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}
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}
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