mirror of
https://github.com/Luzifer/dns.git
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158 lines
3.9 KiB
Python
158 lines
3.9 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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import difflib
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import hashlib
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import os
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import os.path
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import sys
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import time
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# Custom modules
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import consul
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# Third-party imports
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import dns.resolver
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import dns.rdatatype
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import jinja2
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import yaml
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DEFAULT_TTL = 3600
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def default(d, key, default=None):
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if key in d:
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return d[key]
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return default
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def diff_files(file1, file2):
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fromlines = []
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tolines = []
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if os.path.isfile(file1):
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with open(file1) as ff:
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fromlines = ff.readlines()
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if os.path.isfile(file2):
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with open(file2) as tf:
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tolines = tf.readlines()
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print(''.join(difflib.unified_diff(
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fromlines, tolines, file1, file2)))
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def hash_file(filename):
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if not os.path.isfile(filename):
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return ""
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hasher = hashlib.sha1()
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with open(filename, 'r') as afile:
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lines = afile.readlines()
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lines = map(replace_soa_line, lines)
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hasher.update(''.join(lines).encode('utf-8'))
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return hasher.hexdigest()
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def replace_soa_line(line):
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if 'SOA' in line:
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return '; SOA line replaced'
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return line
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def resolve_alias(entry):
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result = []
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answers = []
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answers.extend(dns.resolver.query(
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entry['alias'], 'A', raise_on_no_answer=False))
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answers.extend(dns.resolver.query(
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entry['alias'], 'AAAA', raise_on_no_answer=False))
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if len(answers) == 0:
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raise Exception(
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"Alias {} was not resolvable: No answers!".format(entry['alias']))
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for rdata in answers:
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new_entry = entry.copy()
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del new_entry['alias']
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new_entry['type'] = dns.rdatatype.to_text(rdata.rdtype)
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new_entry['data'] = rdata.address
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result.append(new_entry)
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return sorted(result, key=lambda k: k['data'])
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def sanitize(entry):
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result = []
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if entry['name'] == '':
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entry['name'] = '@'
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if 'alias' in entry:
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return resolve_alias(entry)
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for rr in entry['records']:
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new_entry = entry.copy()
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del new_entry['records']
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new_entry['data'] = rr
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if new_entry['type'] == 'TXT' and new_entry['data'][0] != '"':
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new_entry['data'] = '"{}"'.format(new_entry['data'])
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result.append(new_entry)
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result.sort(key=lambda k: k['data'])
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return result
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def write_zone(zone, ttl, soa, nameserver, mailserver, entries):
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soa['serial'] = int(time.time()) - 946681200 # 2000-01-01
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tpl = jinja2.Template(open("zone_template.j2").read())
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zone_content = tpl.render({
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"zone": zone,
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"ttl": ttl,
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"soa": soa,
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"nameserver": nameserver,
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"mailserver": mailserver,
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"entries": entries,
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})
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with open("zones/tmp.{}".format(zone), 'w') as zf:
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zf.write(zone_content)
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if hash_file("zones/tmp.{}".format(zone)) != hash_file("zones/db.{}".format(zone)):
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print("Generated and replaced zone file for {}".format(zone))
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diff_files("zones/db.{}".format(zone), "zones/tmp.{}".format(zone))
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os.rename("zones/tmp.{}".format(zone), "zones/db.{}".format(zone))
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else:
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os.unlink("zones/tmp.{}".format(zone))
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def main():
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zone_data = yaml.load(open("zones.yml"))
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for zone, config in zone_data['zones'].items():
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ttl = default(config, "default_ttl", DEFAULT_TTL)
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entries = []
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for entry in default(config, 'entries', []):
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entries.extend(sanitize(entry))
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if default(config, 'from_consul', False):
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for entry in consul.query_zone_entries(zone):
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entries.extend(sanitize(entry))
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mailserver = default(config, 'mailserver', {})
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if 'mailserver_set' in config and config['mailserver_set'] in zone_data['mailserver_sets']:
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mailserver = zone_data['mailserver_sets'][config['mailserver_set']]
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write_zone(zone, ttl, zone_data['soa'],
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zone_data['nameserver'], mailserver, entries)
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if __name__ == "__main__":
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main()
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