Refactor - now wireguard based. (#7)

hub/util.go

@@ -38,6 +38,19 @@ func (app *App) sendJSON(w http.ResponseWriter, data any) error {
 	return nil
 }
 
+// addrFromBytes parses raw IP bytes (4 or 16) into a netip.Addr, unmapping
+// IPv4-in-IPv6, returning the zero Addr for empty/invalid input.
+func addrFromBytes(b []byte) netip.Addr {
+	if len(b) == 0 {
+		return netip.Addr{}
+	}
+	addr, ok := netip.AddrFromSlice(b)
+	if !ok {
+		return netip.Addr{}
+	}
+	return addr.Unmap()
+}
+
 func stringToIP(in string) ([]byte, error) {
 	in = strings.TrimSpace(in)
 	if len(in) == 0 {