/** Converts the RRSIG/SIG Record to a String */
public String rdataToString() {
StringBuffer sb = new StringBuffer();
if (signature != null) {
sb.append(Type.string(covered));
sb.append(" ");
sb.append(alg);
sb.append(" ");
sb.append(labels);
sb.append(" ");
sb.append(origttl);
sb.append(" ");
if (Options.check("multiline")) sb.append("(\n\t");
sb.append(FormattedTime.format(expire));
sb.append(" ");
sb.append(FormattedTime.format(timeSigned));
sb.append(" ");
sb.append(footprint);
sb.append(" ");
sb.append(signer);
if (Options.check("multiline")) {
sb.append("\n");
sb.append(base64.formatString(signature, 64, "\t", true));
} else {
sb.append(" ");
sb.append(base64.toString(signature));
}
}
return sb.toString();
}
private Message parseMessage(byte[] b) throws WireParseException {
try {
return (new Message(b));
} catch (IOException e) {
if (Options.check("verbose")) e.printStackTrace();
if (!(e instanceof WireParseException)) e = new WireParseException("Error parsing message");
throw (WireParseException) e;
}
}
private static void addSearch(String search, List list) {
Name name;
if (Options.check("verbose")) System.out.println("adding search " + search);
try {
name = Name.fromString(search, Name.root);
} catch (TextParseException e) {
return;
}
if (list.contains(name)) return;
list.add(name);
}
/** Converts a Record into a String representation */
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append(name);
if (sb.length() < 8) sb.append("\t");
if (sb.length() < 16) sb.append("\t");
sb.append("\t");
if (Options.check("BINDTTL")) sb.append(TTL.format(ttl));
else sb.append(ttl);
sb.append("\t");
if (dclass != DClass.IN || !Options.check("noPrintIN")) {
sb.append(DClass.string(dclass));
sb.append("\t");
}
sb.append(Type.string(type));
String rdata = rrToString();
if (!rdata.equals("")) {
sb.append("\t");
sb.append(rdata);
}
return sb.toString();
}
/*
* Receive an exception. If the resolution has been completed,
* do nothing. Otherwise make progress.
*/
public void handleException(Object id, Exception e) {
if (Options.check("verbose")) System.err.println("ExtendedResolver: got " + e);
synchronized (this) {
outstanding--;
if (done) return;
int n;
for (n = 0; n < inprogress.length; n++) if (inprogress[n] == id) break;
/* If we don't know what this is, do nothing. */
if (n == inprogress.length) return;
boolean startnext = false;
boolean waiting = false;
/*
* If this is the first response from server n,
* we should start sending queries to server n + 1.
*/
if (sent[n] == 1 && n < resolvers.length - 1) startnext = true;
if (e instanceof InterruptedIOException) {
/* Got a timeout; resend */
if (sent[n] < retries) send(n);
if (thrown == null) thrown = e;
} else if (e instanceof SocketException) {
/*
* Problem with the socket; don't resend
* on it
*/
if (thrown == null || thrown instanceof InterruptedIOException) thrown = e;
} else {
/*
* Problem with the response; don't resend
* on the same socket.
*/
thrown = e;
}
if (done) return;
if (startnext) send(n + 1);
if (done) return;
if (outstanding == 0) {
/*
* If we're done and this is synchronous,
* wake up the blocking thread.
*/
done = true;
if (listener == null) {
notifyAll();
return;
}
}
if (!done) return;
}
/* If we're done and this is asynchronous, call the callback. */
if (!(thrown instanceof Exception)) thrown = new RuntimeException(thrown.getMessage());
listener.handleException(this, (Exception) thrown);
}
/*
* Receive a response. If the resolution hasn't been completed,
* either wake up the blocking thread or call the callback.
*/
public void receiveMessage(Object id, Message m) {
if (Options.check("verbose")) System.err.println("ExtendedResolver: " + "received message");
synchronized (this) {
if (done) return;
response = m;
done = true;
if (listener == null) {
notifyAll();
return;
}
}
listener.receiveMessage(this, response);
}
/**
* Converts the generate specification to a string containing the corresponding $GENERATE
* statement.
*/
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append("$GENERATE ");
sb.append(start + "-" + end);
if (step > 1) sb.append("/" + step);
sb.append(" ");
sb.append(namePattern + " ");
sb.append(ttl + " ");
if (dclass != DClass.IN || !Options.check("noPrintIN")) sb.append(DClass.string(dclass) + " ");
sb.append(Type.string(type) + " ");
sb.append(rdataPattern + " ");
return sb.toString();
}
private static final Record getTypedObject(int type) {
if (type < 0 || type > knownRecords.length) return unknownRecord.getObject();
if (knownRecords[type] != null) return knownRecords[type];
/* Construct the class name by putting the type before "Record". */
String s =
Record.class.getPackage().getName() + "." + Type.string(type).replace('-', '_') + "Record";
try {
Class c = Class.forName(s);
Constructor m = c.getDeclaredConstructor(emptyClassArray);
knownRecords[type] = (Record) m.newInstance(emptyObjectArray);
} catch (ClassNotFoundException e) {
/* This is normal; do nothing */
} catch (Exception e) {
if (Options.check("verbose")) System.err.println(e);
}
if (knownRecords[type] == null) knownRecords[type] = unknownRecord.getObject();
return knownRecords[type];
}
/** Converts to a String */
public String toString() {
StringBuffer sb = toStringNoData();
if (key != null || (flags & (FLAG_NOKEY)) == (FLAG_NOKEY)) {
if (!Options.check("nohex")) {
sb.append("0x");
sb.append(Integer.toHexString(flags & 0xFFFF));
} else sb.append(flags & 0xFFFF);
sb.append(" ");
sb.append(proto);
sb.append(" ");
sb.append(alg);
if (key != null) {
sb.append(" (\n");
sb.append(base64.formatString(key, 64, "\t", true));
sb.append(" ; key_tag= ");
sb.append(getFootprint());
}
}
return sb.toString();
}
/**
* Creates a Zone by performing a zone transfer to the specified host. All records that do not
* belong in the Zone are added to the specified Cache.
*
* @see Cache
* @see Master
*/
public Zone(Name zone, short dclass, String remote, Cache cache) throws IOException {
super(false);
origin = zone;
this.dclass = dclass;
type = SECONDARY;
Resolver res = new SimpleResolver(remote);
Record rec = Record.newRecord(zone, Type.AXFR, dclass);
Message query = Message.newQuery(rec);
Message response = res.send(query);
Record[] recs = response.getSectionArray(Section.ANSWER);
for (int i = 0; i < recs.length; i++) {
if (!recs[i].getName().subdomain(origin)) {
if (Options.check("verbose"))
System.err.println(recs[i].getName() + "is not in zone " + origin);
continue;
}
addRecord(recs[i]);
}
if (cache != null) {
recs = response.getSectionArray(Section.ADDITIONAL);
for (int i = 0; i < recs.length; i++) cache.addRecord(recs[i], Credibility.GLUE, recs);
}
validate();
}
/**
* Looks up Records in the Cache. This follows CNAMEs and handles negatively cached data.
*
* @param name The name to look up
* @param type The type to look up
* @param minCred The minimum acceptable credibility
* @return A SetResponse object
* @see SetResponse
* @see Credibility
*/
public SetResponse lookupRecords(Name name, short type, byte minCred) {
SetResponse cr = null;
boolean verbose = Options.check("verbosecache");
Object o = lookup(name, type);
if (verbose) logLookup(name, type, "Starting");
if (o == null || o == NXRRSET) {
/*
* The name exists, but the type was not found. Or, the
* name does not exist and no parent does either. Punt.
*/
if (verbose) logLookup(name, type, "no information found");
return SetResponse.ofType(SetResponse.UNKNOWN);
}
Object[] objects;
if (o instanceof Element) objects = new Object[] {o};
else objects = (Object[]) o;
int nelements = 0;
for (int i = 0; i < objects.length; i++) {
Element element = (Element) objects[i];
if (element.expired()) {
if (verbose) {
logLookup(name, type, element.toString());
logLookup(name, type, "expired: ignoring");
}
removeSet(name, type, element);
objects[i] = null;
} else if (element.credibility < minCred) {
if (verbose) {
logLookup(name, type, element.toString());
logLookup(name, type, "not credible: ignoring");
}
objects[i] = null;
} else {
nelements++;
}
}
if (nelements == 0) {
/* We have data, but can't use it. Punt. */
if (verbose) logLookup(name, type, "no useful data found");
return SetResponse.ofType(SetResponse.UNKNOWN);
}
/*
* We have something at the name. It could be the answer,
* a CNAME, DNAME, or NS, or a negative cache entry.
*
* Ignore wildcards, since it's pretty unlikely that any will be
* cached. The occasional extra query is easily balanced by the
* reduced number of lookups.
*/
for (int i = 0; i < objects.length; i++) {
if (objects[i] == null) continue;
Element element = (Element) objects[i];
if (verbose) logLookup(name, type, element.toString());
RRset rrset = null;
if (element instanceof PositiveElement) rrset = ((PositiveElement) element).rrset;
/* Is this a negatively cached entry? */
if (rrset == null) {
/*
* If this is an NXDOMAIN entry, return NXDOMAIN.
*/
if (element.getType() == 0) {
if (verbose) logLookup(name, type, "NXDOMAIN");
return SetResponse.ofType(SetResponse.NXDOMAIN);
}
/*
* If we're not looking for type ANY, return NXRRSET.
* Otherwise ignore this.
*/
if (type != Type.ANY) {
if (verbose) logLookup(name, type, "NXRRSET");
return SetResponse.ofType(SetResponse.NXRRSET);
} else {
if (verbose) logLookup(name, type, "ANY query; " + "ignoring NXRRSET");
continue;
}
}
short rtype = rrset.getType();
Name rname = rrset.getName();
if (name.equals(rname)) {
if (type != Type.CNAME && type != Type.ANY && rtype == Type.CNAME) {
if (verbose) logLookup(name, type, "cname");
return new SetResponse(SetResponse.CNAME, rrset);
} else if (type != Type.NS && type != Type.ANY && rtype == Type.NS) {
if (verbose) logLookup(name, type, "exact delegation");
return new SetResponse(SetResponse.DELEGATION, rrset);
} else {
if (verbose) logLookup(name, type, "exact match");
if (cr == null) cr = new SetResponse(SetResponse.SUCCESSFUL);
cr.addRRset(rrset);
}
} else if (name.subdomain(rname)) {
if (rtype == Type.DNAME) {
if (verbose) logLookup(name, type, "dname");
return new SetResponse(SetResponse.DNAME, rrset);
} else if (rtype == Type.NS) {
if (verbose) logLookup(name, type, "parent delegation");
return new SetResponse(SetResponse.DELEGATION, rrset);
} else {
if (verbose)
logLookup(name, type, "ignoring rrset (" + rname + " " + Type.string(rtype) + ")");
}
} else {
if (verbose)
logLookup(name, type, "ignoring rrset (" + rname + " " + Type.string(rtype) + ")");
}
}
/*
* As far as I can tell, the only legitimate time cr will be null is
* if we queried for ANY and only saw negative responses, but not an
* NXDOMAIN. Return UNKNOWN.
*/
if (cr == null && type == Type.ANY) return SetResponse.ofType(SetResponse.UNKNOWN);
else if (cr == null)
throw new IllegalStateException(
"looking up (" + name + " " + Type.string(type) + "): " + "cr == null.");
return cr;
}
private static void addServer(String server, List list) {
if (list.contains(server)) return;
if (Options.check("verbose")) System.out.println("adding server " + server);
list.add(server);
}
/**
* Sends a message to a single server and waits for a response. No checking is done to ensure that
* the response is associated with the query.
*
* @param query The query to send.
* @return The response.
* @throws IOException An error occurred while sending or receiving.
*/
public Message send(Message query) throws IOException {
if (Options.check("verbose"))
System.err.println(
"Sending to " + address.getAddress().getHostAddress() + ":" + address.getPort());
if (query.getHeader().getOpcode() == Opcode.QUERY) {
Record question = query.getQuestion();
if (question != null && question.getType() == Type.AXFR) return sendAXFR(query);
}
query = (Message) query.clone();
applyEDNS(query);
if (tsig != null) {
tsig.apply(query, null);
}
byte[] out = query.toWire(Message.MAXLENGTH);
int udpSize = maxUDPSize(query);
boolean tcp = false;
long endTime = System.currentTimeMillis() + timeoutValue;
do {
byte[] b_in;
if (useTCP || out.length > udpSize) {
tcp = true;
}
if (tcp) {
b_in = TCPClient.sendrecv(localAddress, address, out, endTime);
} else {
b_in = UDPClient.sendrecv(localAddress, address, out, udpSize, endTime);
}
/*
* Check that the response is long enough.
*/
if (b_in.length < Header.LENGTH) {
throw new WireParseException("invalid DNS header - " + "too short");
}
/*
* Check that the response ID matches the query ID. We want
* to check this before actually parsing the message, so that
* if there's a malformed response that's not ours, it
* doesn't confuse us.
*/
int id = ((b_in[0] & 0xFF) << 8) + (b_in[1] & 0xFF);
int qid = query.getHeader().getID();
if (id != qid) {
String error = "invalid message id: expected " + qid + "; got id " + id;
if (tcp) {
throw new WireParseException(error);
} else {
if (Options.check("verbose")) {
System.err.println(error);
}
continue;
}
}
Message response = parseMessage(b_in);
verifyTSIG(query, response, b_in, tsig);
if (!tcp && !ignoreTruncation && response.getHeader().getFlag(Flags.TC)) {
tcp = true;
continue;
}
return response;
} while (true);
}
private void verifyTSIG(Message query, Message response, byte[] b, TSIG tsig) {
if (tsig == null) return;
int error = tsig.verify(response, b, query.getTSIG());
if (Options.check("verbose")) System.err.println("TSIG verify: " + Rcode.TSIGstring(error));
}
