🛡️ Sentinel: [CRITICAL] Fix unhandled TypeError for arbitrary IP inputs (DoS)

[ManupaKDU]

🚨 Severity: CRITICAL
💡 Vulnerability: The is_reachable function passed arbitrary ip inputs to ipaddress.ip_address() while only catching ValueError. However, ipaddress.ip_address() raises TypeError when passed certain invalid types (like None, lists, dictionaries, etc.). This unhandled TypeError could bubble up and crash the ThreadPoolExecutor worker threads, leading to a Denial of Service (DoS) vulnerability.
🎯 Impact: An attacker or a downstream component feeding malformed non-string/int inputs into the scanner could crash the worker threads and potentially the main application aggregator, preventing further network scanning operations.
🔧 Fix: Updated the try...except block around ipaddress.ip_address(ip) to catch TypeError alongside ValueError. Added comprehensive unit tests to ensure different invalid types are gracefully handled and safely logged.
✅ Verification: Run python3 -m unittest test_testping1.py and observe that test_is_reachable_type_error passes.

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PR created automatically by Jules for task 12876541776372777468 started by @ManupaKDU

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