Add week 7 materials

2026-10-21 23:03:28 +03:00
parent 4bb38fb0a8
commit a987b82834
22 changed files with 1265 additions and 0 deletions
@@ -0,0 +1,25 @@
+"""Change the authoritative record or flush the resolver's cache."""
+import argparse
+import ipaddress
+import json
+from pathlib import Path
+import subprocess
+from server import ROOT, write_zone
+
+parser = argparse.ArgumentParser(description=__doc__)
+parser.add_argument("action", choices=["reset", "update", "flush", "status"])
+parser.add_argument("--address", default="192.0.2.20")
+parser.add_argument("--ttl", type=int)
+args = parser.parse_args()
+if args.ttl is not None and not 1 <= args.ttl <= 3600:
+    parser.error("TTL must be between 1 and 3600")
+if args.action in ("reset", "update"):
+    previous = json.loads((ROOT / "state.json").read_text())
+    address = "192.0.2.10" if args.action == "reset" else str(ipaddress.IPv4Address(args.address))
+    ttl = args.ttl if args.ttl is not None else (60 if args.action == "reset" else previous["ttl"])
+    write_zone(address, ttl)
+    subprocess.run(["named-checkzone", "lab.test", str(ROOT / "lab.test.zone")], check=True)
+    subprocess.run(["rndc", "-c", str(ROOT / "rndc.conf"), "reload", "lab.test"], check=True)
+    print((ROOT / "state.json").read_text())
+else:
+    subprocess.run(["rndc", "-c", str(ROOT / "rndc.conf"), args.action], check=True)