Skip bind connection with private destination to interface

common/dialer/bind.go

@@ -0,0 +1,19 @@
+package dialer
+
+import (
+	"syscall"
+
+	"github.com/sagernet/sing/common/control"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+)
+
+func skipIfPrivate(next control.Func) control.Func {
+	return func(network, address string, conn syscall.RawConn) error {
+		destination := M.ParseSocksaddr(address)
+		if !N.IsPublicAddr(destination.Addr) {
+			return nil
+		}
+		return next(network, address, conn)
+	}
+}