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 +1,29 @@
+"""Trace the real private hierarchy root-dns -> tld-dns -> auth."""
+import subprocess
+
+
+def dig(*args):
+    command = ["dig", "-r", *args, "+time=2", "+tries=1"]
+    print("\n$ " + " ".join(command), flush=True)
+    result = subprocess.run(command, capture_output=True, text=True, timeout=20)
+    print(result.stdout, flush=True)
+    if result.returncode:
+        raise RuntimeError(result.stderr or result.stdout)
+    return result.stdout
+
+
+def main():
+    print("Private hierarchy: root-dns (.) -> tld-dns (test.) -> auth (lab.test.)")
+    trace = dig("@root-dns", "+trace", "+nodnssec", "orders.lab.test", "A")
+    assert "192.0.2." in trace and "ns.test." in trace and "ns.lab.test." in trace
+    referral = dig("@root-dns", "orders.lab.test", "A", "+norecurse")
+    assert "ANSWER: 0" in referral and "ns.test." in referral
+    tld = dig("@tld-dns", "orders.lab.test", "A", "+norecurse")
+    assert "ANSWER: 0" in tld and "ns.lab.test." in tld
+    final = dig("@auth", "orders.lab.test", "A", "+norecurse")
+    assert "192.0.2." in final and "flags: qr aa" in final
+    print("PASS: real root/TLD referrals and final authoritative answer in the private hierarchy")
+
+
+if __name__ == "__main__":
+    main()