🛡️ Sentinel: [MEDIUM] Prevent Log Injection in __main__ exception handler

[ManupaKDU]

🚨 Severity: MEDIUM
💡 Vulnerability: The exception handler in the __main__ block caught exceptions and directly interpolated {e} into the logging output. If an attacker controlled start_ip or end_ip strings and included \n characters (CRLF sequences), they could inject arbitrary, unsanitized newlines and spoofed log entries into the application's logging stream.
🎯 Impact: Attackers could manipulate log records, potentially masking malicious activity or creating false trails, which compromises the integrity of audit logs.
🔧 Fix: Wrapped the exception output in repr(str(e)) inside the logging call, forcing any injected control characters to be safely escaped as raw literal text instead of evaluated.
✅ Verification: Ensure tests pass locally using python3 -m unittest test_testping1.py, particularly the newly added test_main_block_log_injection.

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PR created automatically by Jules for task 802813851465095539 started by @ManupaKDU

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