def _is_valid_domain(domain: str) -> bool: """ Basic domain validation. Args: domain: Domain string to validate Returns: True if domain appears valid """ if not domain or len(domain) > 253: return False # Check for valid characters and structure parts = domain.split('.') if len(parts) < 2: return False for part in parts: if not part or len(part) > 63: return False if not part.replace('-', '').replace('_', '').isalnum(): return False return True def _is_valid_ip(ip: str) -> bool: """ Basic IP address validation. Args: ip: IP address string to validate Returns: True if IP appears valid """ try: parts = ip.split('.') if len(parts) != 4: return False for part in parts: num = int(part) if not 0 <= num <= 255: return False return True except (ValueError, AttributeError): return False