Created
October 8, 2025 17:36
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| #!/usr/bin/env python3 | |
| import socket | |
| import time | |
| import errno | |
| from datetime import datetime | |
| HOST = "1.1.1.1" | |
| PORT = 80 | |
| CHECK_INTERVAL = 5 | |
| LOG_FILE = "network_log.txt" | |
| TIMEOUT = 3 | |
| def log_event(message): | |
| timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S") | |
| entry = f"{timestamp} - {message}\n" | |
| with open(LOG_FILE, "a") as f: | |
| f.write(entry) | |
| print(entry, end="") | |
| def check_connection(): | |
| try: | |
| with socket.create_connection((HOST, PORT), timeout=TIMEOUT): | |
| return True, None | |
| except OSError as err: | |
| if err.errno == errno.EHOSTUNREACH: | |
| reason = "EHOSTUNREACH" | |
| elif err.errno == errno.ENETUNREACH: | |
| reason = "ENETUNREACH" | |
| elif err.errno == errno.ETIMEDOUT: | |
| reason = "ETIMEDOUT" | |
| elif err.errno == errno.ECONNREFUSED: | |
| reason = "ECONNREFUSED" | |
| elif err.errno is not None: | |
| reason = f"OS error {err.errno}: {err.strerror or err}" | |
| else: | |
| reason = f"Socket error: {err}" | |
| return False, reason | |
| def main(): | |
| last_status = None | |
| down_since = None | |
| log_event(f"Starting network monitor for {HOST}:{PORT}") | |
| try: | |
| while True: | |
| online, error_reason = check_connection() | |
| if online and last_status != "UP": | |
| # We just came back online | |
| if down_since: | |
| downtime = time.time() - down_since | |
| mins, secs = divmod(int(downtime), 60) | |
| log_event(f"Network UP (downtime lasted {mins}m {secs}s)") | |
| down_since = None | |
| else: | |
| log_event("Network UP") | |
| last_status = "UP" | |
| elif not online and last_status != "DOWN": | |
| # We just went offline — log the cause once | |
| log_event(f"Network DOWN ({error_reason})") | |
| down_since = time.time() | |
| last_status = "DOWN" | |
| time.sleep(CHECK_INTERVAL) | |
| except KeyboardInterrupt: | |
| log_event("(KeyboardInterrupt)") | |
| if last_status == "DOWN" and down_since: | |
| downtime = time.time() - down_since | |
| mins, secs = divmod(int(downtime), 60) | |
| log_event(f"Network was DOWN on exit (down for {mins}m {secs}s)") | |
| print("\nExiting gracefully. Log written to:", LOG_FILE) | |
| if __name__ == "__main__": | |
| main() |
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