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
+}