/**
* Builds a new Record from its textual representation
*
* @param name The owner name of the record.
* @param type The record's type.
* @param dclass The record's class.
* @param ttl The record's time to live.
* @param st A tokenizer containing the textual representation of the rdata.
* @param origin The default origin to be appended to relative domain names.
* @return The new record
* @throws IOException The text format was invalid.
*/
public static Record fromString(
Name name, int type, int dclass, long ttl, Tokenizer st, Name origin) throws IOException {
Record rec;
if (!name.isAbsolute()) throw new RelativeNameException(name);
Type.check(type);
DClass.check(dclass);
TTL.check(ttl);
Tokenizer.Token t = st.get();
if (t.type == Tokenizer.IDENTIFIER && t.value.equals("\\#")) {
int length = st.getUInt16();
byte[] data = st.getHex();
if (data == null) {
data = new byte[0];
}
if (length != data.length)
throw st.exception("invalid unknown RR encoding: " + "length mismatch");
DNSInput in = new DNSInput(data);
return newRecord(name, type, dclass, ttl, length, in);
}
st.unget();
rec = getEmptyRecord(name, type, dclass, ttl, true);
rec.rdataFromString(st, origin);
t = st.get();
if (t.type != Tokenizer.EOL && t.type != Tokenizer.EOF) {
throw st.exception("unexpected tokens at end of record");
}
return rec;
}
/** 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 Record parseRR(MyStringTokenizer st, boolean useLast, Record last, Name origin)
throws IOException {
Name name;
int ttl;
short type, dclass;
if (!useLast) name = new Name(st.nextToken(), origin);
else name = last.getName();
String s = st.nextToken();
try {
ttl = TTL.parseTTL(s);
s = st.nextToken();
} catch (NumberFormatException e) {
if (!useLast || last == null) ttl = defaultTTL;
else ttl = last.getTTL();
}
if ((dclass = DClass.value(s)) > 0) s = st.nextToken();
else dclass = DClass.IN;
if ((type = Type.value(s)) < 0) throw new IOException("Parse error");
return Record.fromString(name, type, dclass, ttl, st, origin);
}
public SIGBase(
Name name,
int type,
int dclass,
long ttl,
int covered,
int alg,
long origttl,
Date expire,
Date timeSigned,
int footprint,
Name signer,
byte[] signature) {
super(name, type, dclass, ttl);
Type.check(covered);
checkU8("alg", alg);
checkU8("labels", labels);
TTL.check(origttl);
checkU16("footprint", footprint);
this.covered = covered;
this.alg = alg;
this.labels = name.labels();
this.origttl = origttl;
this.expire = expire;
this.timeSigned = timeSigned;
this.footprint = footprint;
if (!signer.isAbsolute()) throw new RelativeNameException(signer);
this.signer = signer;
this.signature = signature;
}
/**
* Creates a new empty record, with the given parameters.
*
* @param name The owner name of the record.
* @param type The record's type.
* @param dclass The record's class.
* @param ttl The record's time to live.
* @return An object of a subclass of Record
*/
public static Record newRecord(Name name, int type, int dclass, long ttl) {
if (!name.isAbsolute()) throw new RelativeNameException(name);
Type.check(type);
DClass.check(dclass);
TTL.check(ttl);
return getEmptyRecord(name, type, dclass, ttl, false);
}
public String toString() {
StringBuffer sb = new StringBuffer();
if (type == 0) sb.append("NXDOMAIN " + name);
else sb.append("NXRRSET " + name + " " + Type.string(type));
sb.append(" cl = ");
sb.append(credibility);
return sb.toString();
}
/**
* Indicates whether generation is supported for this type.
*
* @throws InvalidTypeException The type is out of range.
*/
public static boolean supportedType(int type) {
Type.check(type);
return (type == Type.PTR
|| type == Type.CNAME
|| type == Type.DNAME
|| type == Type.A
|| type == Type.AAAA
|| type == Type.NS);
}
Record(Name name, int type, int dclass, long ttl) {
if (!name.isAbsolute()) throw new RelativeNameException(name);
Type.check(type);
DClass.check(dclass);
TTL.check(ttl);
this.name = name;
this.type = type;
this.dclass = dclass;
this.ttl = ttl;
}
/**
* 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();
}
Record rdataFromString(Name name, short dclass, int ttl, MyStringTokenizer st, Name origin)
throws TextParseException {
SIGRecord rec = new SIGRecord(name, dclass, ttl);
rec.covered = Type.value(st.nextToken());
rec.alg = Byte.parseByte(st.nextToken());
rec.labels = Byte.parseByte(st.nextToken());
rec.origttl = TTL.parseTTL(st.nextToken());
rec.expire = parseDate(st.nextToken());
rec.timeSigned = parseDate(st.nextToken());
rec.footprint = (short) Integer.parseInt(st.nextToken());
rec.signer = Name.fromString(st.nextToken(), origin);
if (st.hasMoreTokens()) rec.signature = base64.fromString(st.remainingTokens());
return rec;
}
/**
* Creates a new record, with the given parameters.
*
* @param name The owner name of the record.
* @param type The record's type.
* @param dclass The record's class.
* @param ttl The record's time to live.
* @param length The length of the record's data.
* @param data The rdata of the record, in uncompressed DNS wire format. Only the first length
* bytes are used.
*/
public static Record newRecord(
Name name, int type, int dclass, long ttl, int length, byte[] data) {
if (!name.isAbsolute()) throw new RelativeNameException(name);
Type.check(type);
DClass.check(dclass);
TTL.check(ttl);
DNSInput in;
if (data != null) in = new DNSInput(data);
else in = null;
try {
return newRecord(name, type, dclass, ttl, length, in);
} catch (IOException e) {
return null;
}
}
/**
* Converts the given section of the Message to a String.
*
* @see Section
*/
public String sectionToString(int i) {
if (i > 3) return null;
StringBuffer sb = new StringBuffer();
Record[] records = getSectionArray(i);
for (int j = 0; j < records.length; j++) {
Record rec = records[j];
if (i == Section.QUESTION) {
sb.append(";;\t" + rec.name);
sb.append(", type = " + Type.string(rec.type));
sb.append(", class = " + DClass.string(rec.dclass));
} else sb.append(rec);
sb.append("\n");
}
return sb.toString();
}
/**
* Adds a record to the Cache.
*
* @param r The record to be added
* @param cred The credibility of the record
* @param o The source of the record (this could be a Message, for example)
* @see Record
*/
public void addRecord(Record r, byte cred, Object o) {
Name name = r.getName();
short type = r.getRRsetType();
if (!Type.isRR(type)) return;
boolean addrrset = false;
Element element = (Element) findExactSet(name, type);
if (element == null || cred > element.credibility) {
RRset rrset = new RRset();
rrset.addRR(r);
addRRset(rrset, cred);
} else if (cred == element.credibility) {
if (element instanceof PositiveElement) {
PositiveElement pe = (PositiveElement) element;
pe.rrset.addRR(r);
}
}
}
protected static Record rdataFromString(SIGBase rec, Tokenizer st, Name origin)
throws IOException {
String typeString = st.getString();
int covered = Type.value(typeString);
if (covered < 0) throw st.exception("Invalid type: " + typeString);
rec.covered = covered;
String algString = st.getString();
int alg = DNSSEC.Algorithm.value(algString);
if (alg < 0) throw st.exception("Invalid algorithm: " + algString);
rec.alg = alg;
rec.labels = st.getUInt8();
rec.origttl = st.getTTL();
rec.expire = FormattedTime.parse(st.getString());
rec.timeSigned = FormattedTime.parse(st.getString());
rec.footprint = st.getUInt16();
rec.signer = st.getName(origin);
rec.signature = st.getBase64();
return rec;
}
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 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();
}
/** Converts rdata 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(" (\n\t");
sb.append(formatDate(expire));
sb.append(" ");
sb.append(formatDate(timeSigned));
sb.append(" ");
sb.append((int) footprint & 0xFFFF);
sb.append(" ");
sb.append(signer);
sb.append("\n");
sb.append(base64.formatString(signature, 64, "\t", true));
}
return sb.toString();
}
public void check(int val) {
Type.check(val);
}
private void logLookup(Name name, short type, String msg) {
System.err.println("lookupRecords(" + name + " " + Type.string(type) + "): " + msg);
}
/**
* 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;
}