Add socks5 proxy

iface/uspproxy/proxy.go

@@ -0,0 +1,43 @@
+package uspproxy
+
+import (
+	"context"
+	"net"
+
+	"github.com/armon/go-socks5"
+	log "github.com/sirupsen/logrus"
+)
+
+type Dialer interface {
+	Dial(ctx context.Context, network, addr string) (net.Conn, error)
+}
+
+// Proxy todo close server
+type Proxy struct {
+	server *socks5.Server
+}
+
+func NewSocks5(dialer Dialer) (*Proxy, error) {
+	conf := &socks5.Config{
+		Dial: dialer.Dial,
+	}
+	server, err := socks5.New(conf)
+	if err != nil {
+		log.Debugf("failed to init socks5 proxy: %s", err)
+		return nil, err
+	}
+
+	return &Proxy{
+		server: server,
+	}, nil
+}
+
+func (s *Proxy) ListenAndServe(addr string) error {
+	go func() {
+		err := s.server.ListenAndServe("tcp", addr)
+		if err != nil {
+			log.Debugf("failed to start socks5 proxy: %s", err)
+		}
+	}()
+	return nil
+}

iface/uspproxy/tun.go

@@ -0,0 +1,55 @@
+package uspproxy
+
+import (
+	"context"
+	"net"
+	"net/netip"
+
+	log "github.com/sirupsen/logrus"
+	"golang.zx2c4.com/wireguard/tun"
+	"golang.zx2c4.com/wireguard/tun/netstack"
+)
+
+type NSDialer struct {
+	net *netstack.Net
+}
+
+func (d *NSDialer) Dial(ctx context.Context, network, addr string) (net.Conn, error) {
+	conn, err := d.net.Dial(network, addr)
+	if err != nil {
+		log.Debugf("failed to deal connection: %s", err)
+	}
+	return conn, err
+}
+
+type NetStackTun struct {
+	address string
+
+	proxy *Proxy
+}
+
+func NewNetStackTun(address string) *NetStackTun {
+	return &NetStackTun{
+		address: address,
+	}
+}
+
+func (t *NetStackTun) Create() (tun.Device, error) {
+	nsTunDev, tunNet, err := netstack.CreateNetTUN(
+		[]netip.Addr{netip.MustParseAddr(t.address)},
+		[]netip.Addr{netip.MustParseAddr("8.8.8.8")},
+		1420)
+	if err != nil {
+		return nil, err
+	}
+
+	dialer := &NSDialer{tunNet}
+	t.proxy, err = NewSocks5(dialer)
+	if err != nil {
+		// close nsTunDev
+		return nil, err
+	}
+
+	err = t.proxy.ListenAndServe("127.0.0.1:1234")
+	return nsTunDev, nil
+}