Init commit

common/dialer/dialer.go

@@ -0,0 +1,46 @@
+package dialer
+
+import (
+	"context"
+	"net"
+	"time"
+
+	"github.com/database64128/tfo-go"
+	"github.com/sagernet/sing-box/config"
+	"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 (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) (net.PacketConn, error) {
+	return d.ListenConfig.ListenPacket(ctx, "udp", "")
+}
+
+func newDialer(options config.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}
+}

common/dialer/lazy.go

@@ -0,0 +1,59 @@
+package dialer
+
+import (
+	"context"
+	"net"
+	"sync"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/config"
+	E "github.com/sagernet/sing/common/exceptions"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+)
+
+type LazyDialer struct {
+	router   adapter.Router
+	options  config.DialerOptions
+	dialer   N.Dialer
+	initOnce sync.Once
+	initErr  error
+}
+
+func NewDialer(router adapter.Router, options config.DialerOptions) N.Dialer {
+	return &LazyDialer{
+		router:  router,
+		options: options,
+	}
+}
+
+func (d *LazyDialer) Dialer() (N.Dialer, error) {
+	d.initOnce.Do(func() {
+		if d.options.Detour != "" {
+			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)
+			}
+		} else {
+			d.dialer = newDialer(d.options)
+		}
+	})
+	return d.dialer, d.initErr
+}
+
+func (d *LazyDialer) 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 *LazyDialer) ListenPacket(ctx context.Context) (net.PacketConn, error) {
+	dialer, err := d.Dialer()
+	if err != nil {
+		return nil, err
+	}
+	return dialer.ListenPacket(ctx)
+}