feat: use internal resolver for wg network

internal/proxy/proxy_test.go

@@ -0,0 +1,45 @@
+package proxy
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"testing"
+)
+
+func TestDialWithDNS(t *testing.T) {
+	if testing.Short() {
+		t.Skip()
+	}
+
+	stdDiar := net.Dialer{
+		Resolver: &net.Resolver{
+			Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
+				return nil, fmt.Errorf("dial to %s", address)
+			},
+		},
+	}
+
+	// d := dialWithDNS(stdDiar.DialContext, "https://223.5.5.5")
+	d := dialWithDNS(func(ctx context.Context, network, address string) (net.Conn, error) {
+		t.Logf("dial to %s:%s", network, address)
+		return stdDiar.DialContext(ctx, network, address)
+	}, "tls://223.5.5.5")
+
+	for _, addr := range []string{
+		"example.com:80",
+		"223.6.6.6:80",
+		"localhost:22",
+		"127.0.0.1:22",
+	} {
+		t.Run(addr, func(t *testing.T) {
+			conn, err := d(context.Background(), "tcp", addr)
+			if err != nil {
+				t.Error(err)
+			} else {
+				t.Logf("remote %s", conn.RemoteAddr())
+				conn.Close()
+			}
+		})
+	}
+}