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#! /usr/bin/env python3
# vim:set noet sw=8 ts=8 sts=8:
import sys, socket
import dns.query
import dns.zone
import dns.rdatatype
def resolve(hostname):
try:
addrs = socket.getaddrinfo(
hostname, 53, proto=socket.IPPROTO_UDP)
return list(dict.fromkeys([addr[4][0] for addr in addrs]))
except Exception as e:
raise (Exception(f"resolving {hostname}: {e}"))
def axfr(zone, hostname):
addrs = resolve(hostname)
last_exc = None
for addr in addrs:
try:
return dns.zone.from_xfr(dns.query.xfr(addr, zone))
except Exception as e:
last_exc = e
raise (last_exc)
def print_catalog(zone):
nodes = [node
for (name, node) in zone.nodes.items()
if len(name) == 2 and name[1] == b"zones"]
ptrs = [str(ptr.target).rstrip('.')
for node in nodes
for rdataset in node.rdatasets
if rdataset.rdtype == dns.rdatatype.PTR
for ptr in rdataset]
print("\n".join(ptrs))
def main():
if len(sys.argv) != 3:
print(f"Usage: {sys.argv[0]} <zone> <server>", file=sys.stderr)
return 1
zone_name = sys.argv[1]
server = sys.argv[2]
try:
zone = axfr(zone_name, server)
print_catalog(zone)
except Exception as e:
print(f"Failed to load catalog: {e}", file=sys.stderr)
return 1
return 0
if __name__ == "__main__":
sys.exit(main())
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