Reverse-resolution support in invirt-dns

[invirt/packages/invirt-dns.git] / invirt-dns

diff --git a/invirt-dns b/invirt-dns
index e49c279..d6d072e 100755 (executable)
--- a/invirt-dns
+++ b/invirt-dns
@@ -7,6 +7,7 @@ from twisted.names import authority
 from twisted.internet import defer
 from twisted.python import failure
 
+from invirt.common import InvirtConfigError
 from invirt.config import structs as config
 import invirt.database
 import psycopg2
@@ -92,20 +93,41 @@ class DatabaseAuthority(common.ResolverBase):
                     results.append(dns.RRHeader(domain, dns.SOA, dns.IN,
                                                 ttl, self.soa, auth=True))
             else: # Request for a subdomain.
-                value = invirt.database.Machine.query().filter_by(name=host).first()
-                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)))
+                if name.endswith(".in-addr.arpa"): # Reverse resolution here
+                    if type in (dns.PTR, dns.ALL_RECORDS):
+                        ip = '.'.join(reversed(name.split('.')[:-2]))
+                        value = invirt.database.NIC.query.filter_by(ip=ip).first()
+                        if value and value.hostname:
+                            hostname = value.hostname
+                            if '.' not in hostname:
+                                hostname = hostname + "." + config.dns.domains[0]
+                            record = dns.Record_PTR(hostname, ttl)
+                            results.append(dns.RRHeader(name, dns.PTR, dns.IN,
+                                                        ttl, record, auth=True))
+                        else: # IP address doesn't point to an active host
+                            return defer.fail(failure.Failure(dns.AuthoritativeDomainError(name)))
+                    # FIXME: Should only return success with no records if the name actually exists
+                else: # Forward resolution here
+                    value = invirt.database.NIC.query.filter_by(hostname=host).first()
+                    if value:
+                        ip = value.ip
+                    else:
+                        value = invirt.database.Machine.query().filter_by(name=host).first()
+                        if value:
+                            ip = value.nics[0].ip
+                        else:
+                            return defer.fail(failure.Failure(dns.AuthoritativeDomainError(name)))
+                
+                    if ip is None:
+                        return defer.fail(failure.Failure(dns.AuthoritativeDomainError(name)))
 
-                if type in (dns.A, dns.ALL_RECORDS):
-                    record = dns.Record_A(ip, ttl)
-                    results.append(dns.RRHeader(name, dns.A, dns.IN, 
-                                                ttl, record, auth=True))
-                elif type == dns.SOA:
-                    results.append(dns.RRHeader(domain, dns.SOA, dns.IN,
-                                                ttl, self.soa, auth=True))
+                    if type in (dns.A, dns.ALL_RECORDS):
+                        record = dns.Record_A(ip, ttl)
+                        results.append(dns.RRHeader(name, dns.A, dns.IN, 
+                                                    ttl, record, auth=True))
+                    elif type == dns.SOA:
+                        results.append(dns.RRHeader(domain, dns.SOA, dns.IN,
+                                                    ttl, self.soa, auth=True))
             if len(results) == 0:
                 authority = []
                 additional = []
@@ -163,17 +185,21 @@ class QuotingBindAuthority(authority.BindAuthority):
 
 if '__main__' == __name__:
     resolvers = []
-    for zone in config.dns.zone_files:
-        for origin in config.dns.domains:
-            r = QuotingBindAuthority(zone)
-            # This sucks, but if I want a generic zone file, I have to
-            # reload the information by hand
-            r.origin = origin
-            lines = open(zone).readlines()
-            lines = r.collapseContinuations(r.stripComments(lines))
-            r.parseLines(lines)
-            
-            resolvers.append(r)
+    try:
+        for zone in config.dns.zone_files:
+            for origin in config.dns.domains:
+                r = QuotingBindAuthority(zone)
+                # This sucks, but if I want a generic zone file, I have to
+                # reload the information by hand
+                r.origin = origin
+                lines = open(zone).readlines()
+                lines = r.collapseContinuations(r.stripComments(lines))
+                r.parseLines(lines)
+                
+                resolvers.append(r)
+    except InvirtConfigError:
+        # Don't care if zone_files isn't defined
+        pass
     resolvers.append(DatabaseAuthority())
 
     verbosity = 0