projects / lttng-ci.git / blame
| Commit | Line | Data |
|---|---|---|
| c3c15dc7 KS |
1 | #!/usr/bin/env python3 |
| 2 | # | |
| 3 | ||
| 4 | import argparse | |
| 5 | import ipaddress | |
| 6 | import subprocess | |
| 7 | ||
| 8 | import dns.message | |
| 9 | import dns.query | |
| 10 | import dns.resolver | |
| 11 | ||
| 12 | def get_argument_parser(): | |
| 13 | parser = argparse.ArgumentParser( | |
| 14 | prog='update_dns_entry.py', | |
| 15 | description='Generate fixed-address DHCP configuration based for hosts based on DNS entries' | |
| 16 | ) | |
| 17 | parser.add_argument( | |
| 18 | '-s', '--server', default=None, required=True, | |
| 19 | help='Server for DNS updates' | |
| 20 | ) | |
| 21 | parser.add_argument( | |
| 22 | '-u', '--user', default=None, | |
| 23 | help='The user to use with samba-tool' | |
| 24 | ) | |
| 25 | parser.add_argument( | |
| 26 | '-z', '--zone', required=True, | |
| 27 | help='The zone in which to update the entry' | |
| 28 | ) | |
| 29 | parser.add_argument( | |
| 30 | '-n', '--name', required=True, | |
| 31 | help='DNS entry name' | |
| 32 | ) | |
| 33 | parser.add_argument( | |
| 34 | '-v', '--value', required=True, | |
| 35 | help='DNS entry value' | |
| 36 | ) | |
| 37 | parser.add_argument( | |
| 38 | '-t', '--type', default='A', | |
| 39 | help='Entry type' | |
| 40 | ) | |
| 41 | return parser | |
| 42 | ||
| 43 | ||
| 44 | def update_dns_entry(server, zone, name, entry_type, value, user=None, with_reverse = True): | |
| 45 | if entry_type == "A": | |
| 46 | assert(ipaddress.ip_address(value)) | |
| 47 | try: | |
| 48 | server_ip = str(ipaddress.ip_address(server)) | |
| 49 | except ValueError: | |
| 50 | server_ip = dns.resolver.resolve(server)[0].to_text() | |
| 51 | ||
| 52 | commands = [] | |
| 53 | # Verify existing entry | |
| 54 | query = dns.message.make_query('.'.join([name, zone]), entry_type) | |
| 55 | record = dns.query.udp(query, server_ip); | |
| 56 | if len(record.answer) == 0: | |
| 57 | # Create | |
| 58 | argv = ['samba-tool', 'dns', 'add', server, zone, name, entry_type, value] | |
| 59 | if user is not None: | |
| 60 | argv += ['-U', user] | |
| 61 | commands.append(argv) | |
| 62 | else: | |
| 63 | assert(len(record.answer) == 1) | |
| 64 | # Check validity | |
| 65 | existing = (record.answer)[0][0].to_text() | |
| 66 | if existing != value: | |
| 67 | # Update | |
| 68 | argv = ['samba-tool', 'dns', 'update', server, zone, name, entry_type, existing, value] | |
| 69 | if user is not None: | |
| 70 | argv += ['-U', user] | |
| 71 | commands.append(argv) | |
| 72 | ||
| 73 | # Check reverse | |
| 74 | if with_reverse and entry_type == 'A': | |
| 75 | rname, rzone = ipaddress.ip_address(value).reverse_pointer.split('.', 1) | |
| 76 | rvalue = '.'.join([name, zone]) + '.' | |
| 77 | rtype = 'PTR' | |
| 78 | query = dns.message.make_query(ipaddress.ip_address(value).reverse_pointer, rtype) | |
| 79 | record = dns.query.udp(query, server_ip) | |
| 80 | if len(record.answer) == 0: | |
| 81 | argv = ['samba-tool', 'dns', 'add', server, rzone, rname, rtype, rvalue] | |
| 82 | if user is not None: | |
| 83 | argv += ['-U', user] | |
| 84 | commands.append(argv) | |
| 85 | else: | |
| 86 | assert(len(record.answer) == 1) | |
| 87 | existing = (record.answer)[0][0].to_text() | |
| 88 | if existing != value: | |
| 89 | argv = ['samba-tool', 'dns', 'update', server, rzone, rname, rtype, existing, rvalue] | |
| 90 | if user is not None: | |
| 91 | argv += ['-U', user] | |
| 92 | commands.append(argv) | |
| 93 | ||
| 94 | # Run commands | |
| 95 | for command in commands: | |
| 96 | subprocess.run(command, check=True) | |
| 97 | ||
| 98 | ||
| 99 | if __name__ == '__main__': | |
| 100 | parser = get_argument_parser() | |
| 101 | args = parser.parse_args() | |
| 102 | update_dns_entry(args.server, args.zone, args.name, args.type, args.value, user=args.user) |