package dialer import ( "context" "net" "sync" "github.com/sagernet/sing-box/adapter" E "github.com/sagernet/sing/common/exceptions" M "github.com/sagernet/sing/common/metadata" N "github.com/sagernet/sing/common/network" ) type DetourDialer struct { router adapter.Router detour string dialer N.Dialer initOnce sync.Once initErr error } func NewDetour(router adapter.Router, detour string) N.Dialer { return &DetourDialer{router: router, detour: detour} } func (d *DetourDialer) Start() error { _, err := d.Dialer() return err } func (d *DetourDialer) Dialer() (N.Dialer, error) { d.initOnce.Do(func() { var loaded bool d.dialer, loaded = d.router.Outbound(d.detour) if !loaded { d.initErr = E.New("outbound detour not found: ", d.detour) } }) return d.dialer, d.initErr } func (d *DetourDialer) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) { dialer, err := d.Dialer() if err != nil { return nil, err } return dialer.DialContext(ctx, network, destination) } func (d *DetourDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) { dialer, err := d.Dialer() if err != nil { return nil, err } return dialer.ListenPacket(ctx, destination) } func (d *DetourDialer) Upstream() any { detour, _ := d.Dialer() return detour }