Refactor struct & Add override dialer options

outbound/dialer/default.go

@@ -0,0 +1,47 @@
+package dialer
+
+import (
+	"context"
+	"net"
+	"time"
+
+	"github.com/database64128/tfo-go"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/option"
+	"github.com/sagernet/sing/common/control"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+)
+
+type defaultDialer struct {
+	tfo.Dialer
+	net.ListenConfig
+}
+
+func newDefault(options option.DialerOptions) N.Dialer {
+	var dialer net.Dialer
+	var listener net.ListenConfig
+	if options.BindInterface != "" {
+		dialer.Control = control.Append(dialer.Control, control.BindToInterface(options.BindInterface))
+		listener.Control = control.Append(listener.Control, control.BindToInterface(options.BindInterface))
+	}
+	if options.RoutingMark != 0 {
+		dialer.Control = control.Append(dialer.Control, control.RoutingMark(options.RoutingMark))
+		listener.Control = control.Append(listener.Control, control.RoutingMark(options.RoutingMark))
+	}
+	if options.ReuseAddr {
+		listener.Control = control.Append(listener.Control, control.ReuseAddr())
+	}
+	if options.ConnectTimeout != 0 {
+		dialer.Timeout = time.Duration(options.ConnectTimeout) * time.Second
+	}
+	return &defaultDialer{tfo.Dialer{Dialer: dialer, DisableTFO: !options.TCPFastOpen}, listener}
+}
+
+func (d *defaultDialer) DialContext(ctx context.Context, network string, address M.Socksaddr) (net.Conn, error) {
+	return d.Dialer.DialContext(ctx, network, address.String())
+}
+
+func (d *defaultDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
+	return d.ListenConfig.ListenPacket(ctx, C.NetworkUDP, "")
+}

outbound/dialer/detour.go

@@ -0,0 +1,52 @@
+package dialer
+
+import (
+	"context"
+	"net"
+	"sync"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/option"
+	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
+	options  option.DialerOptions
+	dialer   N.Dialer
+	initOnce sync.Once
+	initErr  error
+}
+
+func newDetour(router adapter.Router, options option.DialerOptions) N.Dialer {
+	return &detourDialer{router: router, options: options}
+}
+
+func (d *detourDialer) Dialer() (N.Dialer, error) {
+	d.initOnce.Do(func() {
+		var loaded bool
+		d.dialer, loaded = d.router.Outbound(d.options.Detour)
+		if !loaded {
+			d.initErr = E.New("outbound detour not found: ", d.options.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)
+}

outbound/dialer/dialer.go

@@ -0,0 +1,21 @@
+package dialer
+
+import (
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/option"
+	"github.com/sagernet/sing/common"
+	N "github.com/sagernet/sing/common/network"
+)
+
+func New(router adapter.Router, options option.DialerOptions) N.Dialer {
+	var dialer N.Dialer
+	if options.Detour == "" {
+		dialer = newDefault(options)
+	} else {
+		dialer = newDetour(router, options)
+	}
+	if options.OverrideOptions != nil {
+		dialer = newOverride(dialer, common.PtrValueOrDefault(options.OverrideOptions))
+	}
+	return dialer
+}

outbound/dialer/override.go

@@ -0,0 +1,68 @@
+package dialer
+
+import (
+	"context"
+	"crypto/tls"
+	"net"
+
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/option"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/common/uot"
+)
+
+var _ N.Dialer = (*overrideDialer)(nil)
+
+type overrideDialer struct {
+	upstream   N.Dialer
+	tlsEnabled bool
+	tlsConfig  tls.Config
+	uotEnabled bool
+}
+
+func newOverride(upstream N.Dialer, options option.OverrideStreamOptions) N.Dialer {
+	if !options.TLS && !options.UDPOverTCP {
+		return upstream
+	}
+	return &overrideDialer{
+		upstream,
+		options.TLS,
+		tls.Config{
+			ServerName:         options.TLSServerName,
+			InsecureSkipVerify: options.TLSInsecure,
+		},
+		options.UDPOverTCP,
+	}
+}
+
+func (d *overrideDialer) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
+	switch network {
+	case C.NetworkTCP:
+		conn, err := d.upstream.DialContext(ctx, C.NetworkTCP, destination)
+		if err != nil {
+			return nil, err
+		}
+		return tls.Client(conn, &d.tlsConfig), nil
+	case C.NetworkUDP:
+		if d.uotEnabled {
+			tcpConn, err := d.upstream.DialContext(ctx, C.NetworkTCP, destination)
+			if err != nil {
+				return nil, err
+			}
+			return uot.NewClientConn(tcpConn), nil
+		}
+	}
+	return d.upstream.DialContext(ctx, network, destination)
+}
+
+func (d *overrideDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
+	if d.uotEnabled {
+		tcpConn, err := d.upstream.DialContext(ctx, C.NetworkTCP, destination)
+		if err != nil {
+			return nil, err
+		}
+		return uot.NewClientConn(tcpConn), nil
+	}
+	return d.upstream.ListenPacket(ctx, destination)
+}