From 9806c8f4a43a05675cd0e85b66d4d99b21a3f75e Mon Sep 17 00:00:00 2001
From: Steffen Vogel <post@steffenvogel.de>
Date: Sat, 20 Aug 2022 00:03:37 +0200
Subject: [PATCH] add script to do recursive AXFR DNS requests

---
 python/recursive-axfr/recursive-axfr.py | 52 +++++++++++++++++++++++++
 python/recursive-axfr/requirements.txt  |  1 +
 2 files changed, 53 insertions(+)
 create mode 100644 python/recursive-axfr/recursive-axfr.py
 create mode 100644 python/recursive-axfr/requirements.txt

diff --git a/python/recursive-axfr/recursive-axfr.py b/python/recursive-axfr/recursive-axfr.py
new file mode 100644
index 0000000..9dc9118
--- /dev/null
+++ b/python/recursive-axfr/recursive-axfr.py
@@ -0,0 +1,52 @@
+import dns.resolver
+import dns.zone
+import dns.query
+import dns.rdatatype
+import dns.reversename
+import dns.name
+
+import sys
+
+ZONES = ['0l.de', 'steffenvogel.de', 'dn42.org', 'vogel.cc', 'noteblok.net', 'chaos.family', '0l.dn42']
+
+master_name = 'ipa-0.edgy.vms.0l.de'
+master_answer = dns.resolver.resolve(master_name, 'A')
+
+NS = master_answer[0].address
+
+def get_names(zone, rdtypes=['A', 'AAAA', 'CNAME', 'NS']):
+    names = set()
+
+    zone = dns.name.from_text(zone)
+
+    try:
+        x = dns.query.xfr(NS, zone)
+        z = dns.zone.from_xfr(x)
+
+        for rdtype in rdtypes:
+            rdtype = dns.rdatatype.from_text(rdtype)
+
+            for name, ttl, rdata in z.iterate_rdatas(rdtype):
+                fqdn = name.derelativize(zone).to_text(True)
+
+                if rdtype == dns.rdatatype.NS and len(name) > 0:
+                    names |= get_names(fqdn)
+                elif not name.is_wild():
+                    names.add(fqdn)
+
+    except dns.xfr.TransferError as e:
+        print(f'{e}: {zone}', file=sys.stderr)
+
+    return names
+
+def main():
+
+    names = set()
+    for zone in ZONES:
+        names |= get_names(zone)
+
+    print('\n'.join(sorted(names)))
+
+
+if __name__ == '__main__':
+    main()
diff --git a/python/recursive-axfr/requirements.txt b/python/recursive-axfr/requirements.txt
new file mode 100644
index 0000000..2f73596
--- /dev/null
+++ b/python/recursive-axfr/requirements.txt
@@ -0,0 +1 @@
+dnspython