private static List<Name> subdomainsForName(Name name) {
final List<Name> names = Lists.newArrayList(name);
final String sub = parentDomainForName(name);
if (sub.equals("") || sub.equals(".")) {
names.add(Name.fromConstantString("."));
} else {
names.addAll(subdomainsForName(Name.fromConstantString(sub)));
}
return names;
}
public static DnsRecord createNSRecord(String name, String target) throws Exception {
if (!name.endsWith(".")) name = name + ".";
if (!target.endsWith(".")) target = target + ".";
NSRecord rec = new NSRecord(Name.fromString(name), DClass.IN, 86400L, Name.fromString(target));
return toDnsRecord(DNSRecord.fromWire(rec.toWireCanonical()));
}
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;
}
}
private Message makeQuery(DNSRequest request, int id) throws TextParseException {
Name name = Name.fromString(request.getHostname(), Name.root);
int type;
switch (request.getRecordType()) {
case DNSRequest.A:
type = Type.A;
break;
case DNSRequest.AAAA:
type = Type.AAAA;
break;
case DNSRequest.MX:
type = Type.MX;
break;
case DNSRequest.PTR:
type = Type.PTR;
break;
case DNSRequest.SPF:
type = Type.SPF;
break;
case DNSRequest.TXT:
type = Type.TXT;
break;
default:
throw new UnsupportedOperationException("Unknown query type: " + request.getRecordType());
}
Record question = Record.newRecord(name, type, DClass.ANY);
Message query = Message.newQuery(question);
query.getHeader().setID(id);
return query;
}
@Test
public void itLogsServerErrors() throws Exception {
header.setRcode(Rcode.REFUSED);
Name name = Name.fromString("John Wayne.");
Record question = Record.newRecord(name, 65530, 43210);
Message query = Message.newQuery(question);
Message response = mock(Message.class);
when(response.getHeader()).thenReturn(header);
when(response.getSectionArray(Section.ANSWER)).thenReturn(null);
when(response.getQuestion()).thenReturn(question);
when(nameServer.query(
any(Message.class), any(InetAddress.class), any(DNSAccessRecord.Builder.class)))
.thenThrow(new RuntimeException("Aw snap!"));
FakeAbstractProtocol abstractProtocol = new FakeAbstractProtocol(client, query.toWire());
abstractProtocol.setNameServer(nameServer);
abstractProtocol.run();
verify(accessLogger)
.info(
"144140678.000 qtype=DNS chi=192.168.23.45 ttms=345.123 xn=65535 fqdn=John\\032Wayne. type=TYPE65530 class=CLASS43210 rcode=SERVFAIL rtype=- rloc=\"-\" rdtl=- rerr=\"Server Error:RuntimeException:Aw snap!\" ttl=\"-\" ans=\"-\"");
}
public static Name getInternalName() throws TextParseException {
String internalNameString = VmInstances.INSTANCE_SUBDOMAIN + ".internal.";
internalNameString =
internalNameString.startsWith(".")
? internalNameString.replaceFirst("\\.", "")
: internalNameString;
Name internalName = Name.fromString(internalNameString);
return internalName;
}
/*
* converts a String to a DNS name
*/
private Name nameFromString(String str) {
if (!str.endsWith(".")) str += ".";
try {
return Name.fromString(str);
} catch (Exception e) {
throw new IllegalArgumentException("Invalid DNS name");
}
}
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 Name getExternalName() throws TextParseException {
String externalNameString =
VmInstances.INSTANCE_SUBDOMAIN
+ "."
+ SystemConfiguration.getSystemConfiguration().getDnsDomain()
+ ".";
externalNameString =
externalNameString.startsWith(".")
? externalNameString.replaceFirst("\\.", "")
: externalNameString;
Name externalName = Name.fromString(externalNameString);
return externalName;
}
/*
* Look for SOA records corresponding to the request
* TODO: Add cache coherency to SOA records?
*/
protected synchronized Record checkForSoaRecord(String questionName) {
if (!questionName.endsWith(".")) questionName += ".";
if (soaRecords == null) {
DnsRecord[] getRecs = null;
// load all SOA records...
try {
getRecs = proxy.getDNSByType(Type.SOA);
if (getRecs == null || getRecs.length == 0) soaRecords = Collections.emptyMap();
else {
soaRecords = new HashMap<String, Record>();
for (DnsRecord rec : getRecs) {
Record newRec =
Record.newRecord(
Name.fromString(rec.getName()),
Type.SOA,
rec.getDclass(),
rec.getTtl(),
rec.getData());
soaRecords.put(newRec.getName().toString(), newRec);
}
}
} catch (Exception e) {
LOGGER.error("Failed to load SOA records from config service.");
}
}
Record retVal = null;
if (soaRecords.size() > 0) {
// look for the record by question name
retVal = soaRecords.get(questionName);
if (retVal == null) {
// start taking apart the question name . by .
int index = -1;
while ((index = questionName.indexOf(".")) > 0 && index < (questionName.length() - 1)) {
questionName = questionName.substring(index + 1);
retVal = soaRecords.get(questionName);
if (retVal != null) break;
}
}
}
return retVal;
}
@Test
public void itLogsARecordQueries() throws Exception {
header.setRcode(Rcode.NOERROR);
Name name = Name.fromString("www.example.com.");
Record question = Record.newRecord(name, Type.A, DClass.IN, 0L);
Message query = Message.newQuery(question);
query.getHeader().getRcode();
byte[] queryBytes = query.toWire();
whenNew(Message.class).withArguments(queryBytes).thenReturn(query);
InetAddress resolvedAddress = Inet4Address.getByName("192.168.8.9");
Record answer = new ARecord(name, DClass.IN, 3600L, resolvedAddress);
Record[] answers = new Record[] {answer};
Message response = mock(Message.class);
when(response.getHeader()).thenReturn(header);
when(response.getSectionArray(Section.ANSWER)).thenReturn(answers);
when(response.getQuestion()).thenReturn(question);
InetAddress client = Inet4Address.getByName("192.168.23.45");
when(nameServer.query(
any(Message.class), any(InetAddress.class), any(DNSAccessRecord.Builder.class)))
.thenReturn(response);
FakeAbstractProtocol abstractProtocol = new FakeAbstractProtocol(client, queryBytes);
abstractProtocol.setNameServer(nameServer);
abstractProtocol.run();
verify(accessLogger)
.info(
"144140678.000 qtype=DNS chi=192.168.23.45 ttms=345.123 xn=65535 fqdn=www.example.com. type=A class=IN rcode=NOERROR rtype=- rloc=\"-\" rdtl=- rerr=\"-\" ttl=\"3600\" ans=\"192.168.8.9\"");
}
protected Collection<Record> processGenericANYRecordRequest(String name) throws DNSException {
DnsRecord records[];
try {
records = proxy.getDNSByNameAndType(name, Type.ANY);
} catch (Exception e) {
throw new DNSException(
DNSError.newError(Rcode.SERVFAIL),
"DNS service proxy call for DNS records failed: " + e.getMessage(),
e);
}
if (records == null || records.length == 0) return null;
Collection<Record> retVal = new ArrayList<Record>();
try {
for (DnsRecord record : records) {
Record rec =
Record.newRecord(
Name.fromString(record.getName()),
record.getType(),
record.getDclass(),
record.getTtl(),
record.getData());
retVal.add(rec);
}
} catch (Exception e) {
throw new DNSException(
DNSError.newError(Rcode.SERVFAIL),
"Failure while parsing generic record data: " + e.getMessage(),
e);
}
return retVal;
}
/**
* Processes all DNS CERT requests.
*
* @param name The record name. In many cases this a email address.
* @return Returns a set of record responses to the request.
* @throws DNSException
*/
@SuppressWarnings("unused")
protected RRset processCERTRecordRequest(String name) throws DNSException {
if (name.endsWith(".")) name = name.substring(0, name.length() - 1);
Certificate[] certs;
// use the certificate configuration service
try {
certs = proxy.getCertificatesForOwner(name, null);
} catch (Exception e) {
throw new DNSException(
DNSError.newError(Rcode.SERVFAIL),
"DNS service proxy call for certificates failed: " + e.getMessage(),
e);
}
if (certs == null || certs.length == 0) {
// unless the call above was for an org level cert, it will probably always fail because the
// "name" parameter has had all instances of "@" replaced with ".". The certificate service
// stores owners using "@".
// This is horrible, but try hitting the cert service replacing each "." with "@" one by one.
// Start at the beginning of the address because this is more than likely where the "@"
// character
// will be.
int previousIndex = 0;
int replaceIndex = 0;
while ((replaceIndex = name.indexOf(".", previousIndex)) > -1) {
char[] chars = name.toCharArray();
chars[replaceIndex] = '@';
try {
certs = proxy.getCertificatesForOwner(String.copyValueOf(chars), null);
} catch (Exception e) {
throw new DNSException(
DNSError.newError(Rcode.SERVFAIL),
"DNS service proxy call for certificates failed: " + e.getMessage(),
e);
}
if (certs != null && certs.length > 0) break;
if (replaceIndex >= (name.length() - 1)) break;
previousIndex = replaceIndex + 1;
}
}
if (certs == null || certs.length == 0) return null;
if (!name.endsWith(".")) name += ".";
RRset retVal = new RRset();
try {
for (Certificate cert : certs) {
int certRecordType = CERTRecord.PKIX;
byte[] retData = null;
X509Certificate xCert = null;
try {
// need to convert to cert container because this might be
// a certificate with wrapped private key data
final CertUtils.CertContainer cont = CertUtils.toCertContainer(cert.getData());
xCert = cont.getCert();
// check if this is a compliant certificate with the configured policy... if not, move on
if (!isCertCompliantWithPolicy(xCert)) continue;
retData = xCert.getEncoded();
} catch (CertificateConversionException e) {
// probably not a Certificate... might be a URL
}
if (xCert == null) {
// see if it's a URL
try {
retData = cert.getData();
URL url = new URL(new String(retData));
certRecordType = CERTRecord.URI;
} catch (Exception e) {
throw new DNSException(
DNSError.newError(Rcode.SERVFAIL),
"Failure while parsing CERT record data: " + e.getMessage(),
e);
}
}
int keyTag = 0;
int alg = 0;
if (xCert != null && xCert.getPublicKey() instanceof RSAKey) {
RSAKey key = (RSAKey) xCert.getPublicKey();
byte[] modulus = key.getModulus().toByteArray();
keyTag = (modulus[modulus.length - 2] << 8) & 0xFF00;
keyTag |= modulus[modulus.length - 1] & 0xFF;
alg = 5;
}
CERTRecord rec =
new CERTRecord(
Name.fromString(name),
DClass.IN,
86400L,
certRecordType,
keyTag,
alg /*public key alg, RFC 4034*/,
retData);
retVal.addRR(rec);
}
} catch (Exception e) {
throw new DNSException(
DNSError.newError(Rcode.SERVFAIL),
"Failure while parsing CERT record data: " + e.getMessage(),
e);
}
// because of policy filtering, it's possible that we could have filtered out every cert
// resulting in an empty RR set
return (retVal.size() == 0) ? null : retVal;
}
private static String parentDomainForName(Name name) {
return name.toString().replaceAll("\\A[^\\.]+\\.", "");
}
/* (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);
}
}
/** {@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;
}
public static void main(String[] args) throws Exception {
ZoneTransferIn xfrin;
TSIG key = null;
int ixfr_serial = -1;
String server = null;
int port = SimpleResolver.DEFAULT_PORT;
boolean fallback = false;
Name zname;
int arg = 0;
while (arg < args.length) {
if (args[arg].equals("-i")) {
ixfr_serial = Integer.parseInt(args[++arg]);
if (ixfr_serial < 0) usage("invalid serial number");
} else if (args[arg].equals("-k")) {
String s = args[++arg];
int index = s.indexOf('/');
if (index < 0) usage("invalid key");
key = new TSIG(s.substring(0, index), s.substring(index + 1));
} else if (args[arg].equals("-s")) {
server = args[++arg];
} else if (args[arg].equals("-p")) {
port = Integer.parseInt(args[++arg]);
if (port < 0 || port > 0xFFFF) usage("invalid port");
} else if (args[arg].equals("-f")) {
fallback = true;
} else if (args[arg].startsWith("-")) {
usage("invalid option");
} else {
break;
}
arg++;
}
if (arg >= args.length) usage("no zone name specified");
zname = Name.fromString(args[arg]);
if (server == null) {
Lookup l = new Lookup(zname, Type.NS);
Record[] ns = l.run();
if (ns == null) {
System.out.println("failed to look up NS record: " + l.getErrorString());
System.exit(1);
}
server = ns[0].rdataToString();
System.out.println("sending to server '" + server + "'");
}
if (ixfr_serial >= 0)
xfrin = ZoneTransferIn.newIXFR(zname, ixfr_serial, fallback, server, port, key);
else xfrin = ZoneTransferIn.newAXFR(zname, server, port, key);
List response = xfrin.run();
if (xfrin.isAXFR()) {
if (ixfr_serial >= 0) System.out.println("AXFR-like IXFR response");
else System.out.println("AXFR response");
Iterator it = response.iterator();
while (it.hasNext()) System.out.println(it.next());
} else if (xfrin.isIXFR()) {
System.out.println("IXFR response");
Iterator it = response.iterator();
while (it.hasNext()) {
ZoneTransferIn.Delta delta;
delta = (ZoneTransferIn.Delta) it.next();
System.out.println("delta from " + delta.start + " to " + delta.end);
System.out.println("deletes");
Iterator it2 = delta.deletes.iterator();
while (it2.hasNext()) System.out.println(it2.next());
System.out.println("adds");
it2 = delta.adds.iterator();
while (it2.hasNext()) System.out.println(it2.next());
}
} else if (xfrin.isCurrent()) {
System.out.println("up to date");
}
}
