2 from twisted.internet import reactor
3 from twisted.names import server
4 from twisted.names import dns
5 from twisted.names import common
6 from twisted.internet import defer
7 from twisted.python import failure
9 from invirt.config import structs as config
10 import invirt.database
15 class DatabaseAuthority(common.ResolverBase):
16 """An Authority that is loaded from a file."""
20 def __init__(self, domains=None, database=None):
21 common.ResolverBase.__init__(self)
22 if database is not None:
23 invirt.database.connect(database)
25 invirt.database.connect()
26 if domains is not None:
27 self.domains = domains
29 self.domains = config.dns.domains
30 ns = config.dns.nameservers[0]
31 self.soa = dns.Record_SOA(mname=ns.hostname,
32 rname=config.dns.contact.replace('@','.',1),
33 serial=1, refresh=3600, retry=900,
34 expire=3600000, minimum=21600, ttl=3600)
35 self.ns = dns.Record_NS(name=ns.hostname, ttl=3600)
36 record = dns.Record_A(address=ns.ip, ttl=3600)
37 self.ns1 = dns.RRHeader(ns.hostname, dns.A, dns.IN,
38 3600, record, auth=True)
41 def _lookup(self, name, cls, type, timeout = None):
44 value = self._lookup_unsafe(name, cls, type, timeout = None)
45 except (psycopg2.OperationalError, sqlalchemy.exceptions.SQLError):
48 print "Reloading database"
54 def _lookup_unsafe(self, name, cls, type, timeout):
55 invirt.database.clear_cache()
59 if name in self.domains:
62 # This works because domain will remain bound after breaking out of the loop
63 for domain in self.domains:
64 if name.endswith('.'+domain):
67 return defer.fail(failure.Failure(dns.DomainError(name)))
70 additional = [self.ns1]
71 authority.append(dns.RRHeader(domain, dns.NS, dns.IN,
72 3600, self.ns, auth=True))
74 host = name[:-len(domain)-1]
76 if type in (dns.A, dns.ALL_RECORDS):
77 record = dns.Record_A(config.dns.nameservers[0].ip, ttl)
78 results.append(dns.RRHeader(name, dns.A, dns.IN,
79 ttl, record, auth=True))
81 results.append(dns.RRHeader(domain, dns.NS, dns.IN,
82 ttl, self.ns, auth=True))
85 results.append(dns.RRHeader(domain, dns.SOA, dns.IN,
86 ttl, self.soa, auth=True))
89 value = invirt.database.Machine.get_by(name=host)
90 if value is None or not value.nics:
91 return defer.fail(failure.Failure(dns.AuthoritativeDomainError(name)))
93 if ip is None: #Deactivated?
94 return defer.fail(failure.Failure(dns.AuthoritativeDomainError(name)))
95 if type in (dns.A, dns.ALL_RECORDS):
96 record = dns.Record_A(ip, ttl)
97 results.append(dns.RRHeader(name, dns.A, dns.IN,
98 ttl, record, auth=True))
100 results.append(dns.RRHeader(domain, dns.SOA, dns.IN,
101 ttl, self.soa, auth=True))
102 if len(results) == 0:
105 return defer.succeed((results, authority, additional))
108 return defer.fail(failure.Failure(dns.AuthoritativeDomainError(name)))
110 if '__main__' == __name__:
111 resolver = DatabaseAuthority()
114 f = server.DNSServerFactory(authorities=[resolver], verbose=verbosity)
115 p = dns.DNSDatagramProtocol(f)
116 f.noisy = p.noisy = verbosity
118 reactor.listenUDP(53, p)
119 reactor.listenTCP(53, f)