public static Zone getInstanceExternalZone() {
try {
Name name = getExternalName();
Name host = Name.fromString("root." + name.toString());
Name admin =
Name.fromString(
Internets.localHostInetAddress().getCanonicalHostName() + "." + name.toString());
Name target = Name.fromString(Internets.localHostInetAddress().getCanonicalHostName() + ".");
long serial = 1;
long refresh = 86400;
long retry = ttl;
long expires = 2419200;
// This is the negative cache TTL
long minimum = 600;
Record soarec =
new SOARecord(
name, DClass.IN, ttl, host, admin, serial, refresh, retry, expires, minimum);
long nsTTL = 604800;
Record nsrec = new NSRecord(name, DClass.IN, nsTTL, target);
return new TransientZone(name, new Record[] {soarec, nsrec});
} catch (Exception e) {
LOG.error(e, e);
return null;
}
}
public static Zone getPtrZone(Name queryName) {
try {
String nameString = queryName.toString();
Name name;
int index = nameString.indexOf(".in-addr.arpa.");
if (index > 0) {
String ipString = nameString.substring(0, index);
String[] parts = ipString.split("\\.");
// fix this for v6
if (parts.length == 4) {
nameString = nameString.substring(parts[0].length() + 1);
name = new Name(nameString);
} else {
return null;
}
} else {
return null;
}
long serial = 1;
long refresh = 86400;
long retry = ttl;
long expires = 2419200;
// This is the negative cache TTL
long minimum = 600;
Record soarec =
new SOARecord(
name,
DClass.IN,
ttl,
name,
Name.fromString("root." + name.toString()),
serial,
refresh,
retry,
expires,
minimum);
long nsTTL = 604800;
Record nsrec =
new NSRecord(
name,
DClass.IN,
nsTTL,
Name.fromString(Internets.localHostInetAddress().getCanonicalHostName() + "."));
return new TransientZone(name, new Record[] {soarec, nsrec});
} catch (Exception e) {
LOG.error(e, e);
return null;
}
}
/** {@inheritDoc} */
@SuppressWarnings("unchecked")
@Override
public Message get(Message request) throws DNSException {
LOGGER.trace("get(Message) Entered");
/* for testing time out cases
try
{
Thread.sleep(1000000);
}
catch (Exception e)
{
}
*/
if (request == null) throw new DNSException(DNSError.newError(Rcode.FORMERR));
Header header = request.getHeader();
if (header.getFlag(Flags.QR) || header.getRcode() != Rcode.NOERROR)
throw new DNSException(DNSError.newError(Rcode.FORMERR));
if (header.getOpcode() != Opcode.QUERY) throw new DNSException(DNSError.newError(Rcode.NOTIMP));
Record question = request.getQuestion();
if (question == null || question.getDClass() != DClass.IN) {
throw new DNSException(DNSError.newError(Rcode.NOTIMP));
}
Record queryRecord = request.getQuestion();
Name name = queryRecord.getName();
int type = queryRecord.getType();
if (LOGGER.isDebugEnabled()) {
StringBuilder builder = new StringBuilder("Recieved Query Request:");
builder.append("\r\n\tName: " + name.toString());
builder.append("\r\n\tType: " + type);
builder.append("\r\n\tDClass: " + queryRecord.getDClass());
LOGGER.debug(builder.toString());
}
Collection<Record> lookupRecords = null;
switch (question.getType()) {
case Type.A:
case Type.MX:
case Type.SOA:
case Type.SRV:
case Type.NS:
case Type.CNAME:
{
try {
final RRset set = processGenericRecordRequest(name.toString(), type);
if (set != null) {
lookupRecords = new ArrayList<Record>();
Iterator<Record> iter = set.rrs();
while (iter.hasNext()) lookupRecords.add(iter.next());
}
} catch (Exception e) {
throw new DNSException(
DNSError.newError(Rcode.SERVFAIL),
"DNS service proxy call failed: " + e.getMessage(),
e);
}
break;
}
case Type.CERT:
{
final RRset set = processCERTRecordRequest(name.toString());
if (set != null) {
lookupRecords = new ArrayList<Record>();
Iterator<Record> iter = set.rrs();
while (iter.hasNext()) lookupRecords.add(iter.next());
}
break;
}
case Type.ANY:
{
Collection<Record> genRecs = processGenericANYRecordRequest(name.toString());
RRset certRecs = processCERTRecordRequest(name.toString());
if (genRecs != null || certRecs != null) {
lookupRecords = new ArrayList<Record>();
if (genRecs != null) lookupRecords.addAll(genRecs);
if (certRecs != null) {
Iterator<Record> iter = certRecs.rrs();
while (iter.hasNext()) lookupRecords.add(iter.next());
}
}
break;
}
default:
{
LOGGER.debug("Query Type " + type + " not implemented");
throw new DNSException(
DNSError.newError(Rcode.NOTIMP), "Query Type " + type + " not implemented");
}
}
if (lookupRecords == null || lookupRecords.size() == 0) {
LOGGER.debug("No records found.");
return null;
}
final Message response = new Message(request.getHeader().getID());
response.getHeader().setFlag(Flags.QR);
if (request.getHeader().getFlag(Flags.RD)) response.getHeader().setFlag(Flags.RD);
response.addRecord(queryRecord, Section.QUESTION);
final Iterator<Record> iter = lookupRecords.iterator();
while (iter.hasNext()) response.addRecord(iter.next(), Section.ANSWER);
// we are authoritative only
response.getHeader().setFlag(Flags.AA);
// look for an SOA record
final Record soaRecord = checkForSoaRecord(name.toString());
if (soaRecord != null) response.addRecord(soaRecord, Section.AUTHORITY);
LOGGER.trace("get(Message) Exit");
return response;
}
/* (non-Javadoc)
* @see com.eucalyptus.dns.Zone#findRecords(org.xbill.DNS.Name, int)
*/
@Override
public SetResponse findRecords(Name name, int type) {
if (type == Type.AAAA) return (SetResponse.ofType(SetResponse.SUCCESSFUL));
if (StackConfiguration.USE_INSTANCE_DNS
&& name.toString().matches("euca-.+{3}-.+{3}-.+{3}-.+{3}\\..*")) {
try {
String[] tryIp =
name.toString()
.replaceAll("euca-", "")
.replaceAll(VmInstances.INSTANCE_SUBDOMAIN + ".*", "")
.split("-");
if (tryIp.length < 4) return super.findRecords(name, type);
String ipCandidate =
new StringBuffer()
.append(tryIp[0])
.append(".")
.append(tryIp[1])
.append(".")
.append(tryIp[2])
.append(".")
.append(tryIp[3])
.toString();
try {
VmInstances.lookupByPublicIp(ipCandidate);
} catch (Exception e) {
try {
VmInstances.lookupByPrivateIp(ipCandidate);
} catch (Exception e1) {
return super.findRecords(name, type);
}
}
InetAddress ip = InetAddress.getByName(ipCandidate);
SetResponse resp = new SetResponse(SetResponse.SUCCESSFUL);
resp.addRRset(new RRset(new ARecord(name, 1, ttl, ip)));
return resp;
} catch (Exception e) {
return super.findRecords(name, type);
}
} else if (StackConfiguration.USE_INSTANCE_DNS && name.toString().endsWith(".in-addr.arpa.")) {
int index = name.toString().indexOf(".in-addr.arpa.");
Name target;
if (index > 0) {
String ipString = name.toString().substring(0, index);
String[] parts = ipString.split("\\.");
String ipCandidate;
if (parts.length == 4) {
ipCandidate =
new StringBuffer()
.append(parts[3])
.append(".")
.append(parts[2])
.append(".")
.append(parts[1])
.append(".")
.append(parts[0])
.toString();
} else {
return super.findRecords(name, type);
}
try {
VmInstance instance = VmInstances.lookupByPublicIp(ipCandidate);
target = new Name(instance.getPublicDnsName() + ".");
} catch (Exception e) {
try {
VmInstance instance = VmInstances.lookupByPrivateIp(ipCandidate);
target = new Name(instance.getPrivateDnsName() + ".");
} catch (Exception e1) {
return super.findRecords(name, type);
}
}
SetResponse resp = new SetResponse(SetResponse.SUCCESSFUL);
resp.addRRset(new RRset(new PTRRecord(name, DClass.IN, ttl, target)));
return resp;
} else {
return super.findRecords(name, type);
}
} else {
return super.findRecords(name, type);
}
}
private static String parentDomainForName(Name name) {
return name.toString().replaceAll("\\A[^\\.]+\\.", "");
}
