From 7677e337e3d84e0fe768861e778b9b89e5282c01 Mon Sep 17 00:00:00 2001
From: gru <gru@gitea.linuxiarz.pl>
Date: Tue, 17 Jun 2025 00:05:07 +0200
Subject: [PATCH] Add check_cups_working.py

---
 check_cups_working.py | 62 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 check_cups_working.py

diff --git a/check_cups_working.py b/check_cups_working.py
new file mode 100644
index 0000000..c891aff
--- /dev/null
+++ b/check_cups_working.py
@@ -0,0 +1,62 @@
+#!/usr/bin/env python3
+"""
+This script checks whether the CUPS service is listening on TCP port 631.
+If not, it restarts the service and verifies again.
+
+ Example manual usage:
+    sudo /usr/local/bin/check_cups_working.py --host 127.0.0.1
+
+ Example crontab entry (run every 5 minutes, silent mode):
+    */5 * * * * root /usr/local/bin/check_cups_working.py --host 127.0.0.1 --quiet
+"""
+
+import socket
+import subprocess
+import time
+import sys
+import argparse
+
+PORT = 631
+SERVICE = "cups"
+
+def is_port_listening(host, port):
+    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
+        s.settimeout(1)
+        try:
+            s.connect((host, port))
+            return True
+        except (ConnectionRefusedError, socket.timeout, OSError):
+            return False
+
+def restart_service(service):
+    subprocess.run(["systemctl", "restart", service], check=False)
+    time.sleep(3)
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="Checks if CUPS is listening on TCP port 631 and restarts the service if not."
+    )
+    parser.add_argument("--host", default="127.0.0.1", help="IP address to check (default: 127.0.0.1)")
+    parser.add_argument("--quiet", action="store_true", help="Suppress all output (for use in cron jobs)")
+    args = parser.parse_args()
+
+    def log(msg):
+        if not args.quiet:
+            print(msg)
+
+    if is_port_listening(args.host, PORT):
+        log(f"CUPS OK: listening on {args.host}:{PORT}")
+        sys.exit(0)
+    else:
+        log(f"CUPS not listening on {args.host}:{PORT}. Restarting service...")
+        restart_service(SERVICE)
+
+        if is_port_listening(args.host, PORT):
+            log("CUPS restarted and is now listening.")
+            sys.exit(0)
+        else:
+            log("ERROR: CUPS still not listening after restart!")
+            sys.exit(2)
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file