Bring sipb-xen-dns into alignment with more standard packaging practices

[invirt/packages/invirt-dns.git] / code / dnsserver.py

diff --git a/code/dnsserver.py b/code/dnsserver.py
deleted file mode 100755 (executable)
index ae46d4c..0000000
--- a/code/dnsserver.py
+++ /dev/null
@@ -1,110 +0,0 @@
-#!/usr/bin/python
-from twisted.internet import reactor
-from twisted.names import server
-from twisted.names import dns
-from twisted.names import common
-from twisted.internet import defer
-from twisted.python import failure
-
-import sipb_xen_database
-import psycopg2
-import sqlalchemy
-import time
-
-class DatabaseAuthority(common.ResolverBase):
-    """An Authority that is loaded from a file."""
-
-    soa = None
-
-    def __init__(self, domains, database=None):
-        common.ResolverBase.__init__(self)
-        if database is not None:
-            sipb_xen_database.connect(database)
-        self.domains = domains
-        self.soa = dns.Record_SOA(mname='sipb-xen-dev.mit.edu', 
-                                  rname='sipb-xen.mit.edu',
-                                  serial=1, refresh=3600, retry=900,
-                                  expire=3600000, minimum=21600, ttl=3600)
-        self.ns = dns.Record_NS(name='ns1.xvm.mit.edu', ttl=3600)
-        record = dns.Record_A(address='18.181.0.62', ttl=3600)
-        self.ns1 = dns.RRHeader('ns1.xvm.mit.edu', dns.A, dns.IN,
-                                3600, record, auth=True)
-
-    
-    def _lookup(self, name, cls, type, timeout = None):
-        for i in range(3):
-            try:
-                value = self._lookup_unsafe(name, cls, type, timeout = None)
-            except (psycopg2.OperationalError, sqlalchemy.exceptions.SQLError):
-                if i == 2:
-                    raise
-                print "Reloading database"
-                time.sleep(0.5)
-                continue
-            else:
-                return value
-
-    def _lookup_unsafe(self, name, cls, type, timeout):
-        sipb_xen_database.clear_cache()
-        
-        ttl = 900
-        name = name.lower()
-        if name in self.domains:
-            domain = name
-        else:
-            # This works because domain will remain bound after breaking out of the loop
-            for domain in self.domains:
-                if name.endswith('.'+domain):
-                    break
-            else: #Not us
-                return defer.fail(failure.Failure(dns.DomainError(name)))
-        results = []
-        authority = []
-        additional = [self.ns1]
-        authority.append(dns.RRHeader(domain, dns.NS, dns.IN,
-                                      3600, self.ns, auth=True))
-        if cls == dns.IN:
-            if type in (dns.A, dns.ALL_RECORDS):
-                host = name[:-len(domain)-1]
-                if not host:
-                    record = dns.Record_A('18.181.0.62', ttl)
-                    results.append(dns.RRHeader(name, dns.A, dns.IN, 
-                                                ttl, record, auth=True))
-                else:
-                    value = sipb_xen_database.Machine.get_by(name=host)
-                    if value is None or not value.nics:
-                        return defer.fail(failure.Failure(dns.AuthoritativeDomainError(name)))
-                    ip = value.nics[0].ip
-                    if ip is None:  #Deactivated?
-                        return defer.fail(failure.Failure(dns.AuthoritativeDomainError(name)))
-                    record = dns.Record_A(ip, ttl)
-                    results.append(dns.RRHeader(name, dns.A, dns.IN, 
-                                                ttl, record, auth=True))
-            elif type == dns.NS:
-                results.append(dns.RRHeader(domain, dns.NS, dns.IN,
-                                            ttl, self.ns, auth=True))
-                authority = []
-            elif type == dns.SOA:
-                results.append(dns.RRHeader(domain, dns.SOA, dns.IN,
-                                            ttl, self.soa, auth=True))
-            if len(results) == 0:
-                authority = []
-                additional = []
-            return defer.succeed((results, authority, additional))
-        else:
-            #Doesn't exist
-            return defer.fail(failure.Failure(dns.AuthoritativeDomainError(name)))
-
-if '__main__' == __name__:
-    resolver = DatabaseAuthority(['servers.csail.mit.edu',
-                                  'xvm.mit.edu'],
-                                 'postgres://sipb-xen@sipb-xen-dev/sipb_xen')
-
-    verbosity = 0
-    f = server.DNSServerFactory(authorities=[resolver], verbose=verbosity)
-    p = dns.DNSDatagramProtocol(f)
-    f.noisy = p.noisy = verbosity
-    
-    reactor.listenUDP(53, p)
-    reactor.listenTCP(53, f)
-    reactor.run()