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// Copyright (c) 1999-2004 Brian Wellington ([email protected])
import java.io.*;
import java.net.*;
import java.util.*;
import org.xbill.DNS.*;
/** @author Brian Wellington <[email protected]> */
public class jnamed {
static final int FLAG_DNSSECOK = 1;
static final int FLAG_SIGONLY = 2;
Map caches;
Map znames;
Map TSIGs;
private static String
addrport(InetAddress addr, int port) {
return addr.getHostAddress() + "#" + port;
}
public
jnamed(String conffile) throws IOException, ZoneTransferException {
FileInputStream fs;
InputStreamReader isr;
BufferedReader br;
List ports = new ArrayList();
List addresses = new ArrayList();
try {
fs = new FileInputStream(conffile);
isr = new InputStreamReader(fs);
br = new BufferedReader(isr);
}
catch (Exception e) {
System.out.println("Cannot open " + conffile);
return;
}
try {
caches = new HashMap();
znames = new HashMap();
TSIGs = new HashMap();
String line = null;
while ((line = br.readLine()) != null) {
StringTokenizer st = new StringTokenizer(line);
if (!st.hasMoreTokens())
continue;
String keyword = st.nextToken();
if (!st.hasMoreTokens()) {
System.out.println("Invalid line: " + line);
continue;
}
if (keyword.charAt(0) == '#')
continue;
if (keyword.equals("primary"))
addPrimaryZone(st.nextToken(), st.nextToken());
else if (keyword.equals("secondary"))
addSecondaryZone(st.nextToken(),
st.nextToken());
else if (keyword.equals("cache")) {
Cache cache = new Cache(st.nextToken());
caches.put(new Integer(DClass.IN), cache);
} else if (keyword.equals("key")) {
String s1 = st.nextToken();
String s2 = st.nextToken();
if (st.hasMoreTokens())
addTSIG(s1, s2, st.nextToken());
else
addTSIG("hmac-md5", s1, s2);
} else if (keyword.equals("port")) {
ports.add(Integer.valueOf(st.nextToken()));
} else if (keyword.equals("address")) {
String addr = st.nextToken();
addresses.add(Address.getByAddress(addr));
} else {
System.out.println("unknown keyword: " +
keyword);
}
}
if (ports.size() == 0)
ports.add(new Integer(53));
if (addresses.size() == 0)
addresses.add(Address.getByAddress("0.0.0.0"));
Iterator iaddr = addresses.iterator();
while (iaddr.hasNext()) {
InetAddress addr = (InetAddress) iaddr.next();
Iterator iport = ports.iterator();
while (iport.hasNext()) {
int port = ((Integer)iport.next()).intValue();
addUDP(addr, port);
addTCP(addr, port);
System.out.println("jnamed: listening on " +
addrport(addr, port));
}
}
System.out.println("jnamed: running");
}
finally {
fs.close();
}
}
public void
addPrimaryZone(String zname, String zonefile) throws IOException {
Name origin = null;
if (zname != null)
origin = Name.fromString(zname, Name.root);
Zone newzone = new Zone(origin, zonefile);
znames.put(newzone.getOrigin(), newzone);
}
public void
addSecondaryZone(String zone, String remote)
throws IOException, ZoneTransferException
{
Name zname = Name.fromString(zone, Name.root);
Zone newzone = new Zone(zname, DClass.IN, remote);
znames.put(zname, newzone);
}
public void
addTSIG(String algstr, String namestr, String key) throws IOException {
Name name = Name.fromString(namestr, Name.root);
TSIGs.put(name, new TSIG(algstr, namestr, key));
}
public Cache
getCache(int dclass) {
Cache c = (Cache) caches.get(new Integer(dclass));
if (c == null) {
c = new Cache(dclass);
caches.put(new Integer(dclass), c);
}
return c;
}
public Zone
findBestZone(Name name) {
Zone foundzone = null;
foundzone = (Zone) znames.get(name);
if (foundzone != null)
return foundzone;
int labels = name.labels();
for (int i = 1; i < labels; i++) {
Name tname = new Name(name, i);
foundzone = (Zone) znames.get(tname);
if (foundzone != null)
return foundzone;
}
return null;
}
public RRset
findExactMatch(Name name, int type, int dclass, boolean glue) {
Zone zone = findBestZone(name);
if (zone != null)
return zone.findExactMatch(name, type);
else {
RRset [] rrsets;
Cache cache = getCache(dclass);
if (glue)
rrsets = cache.findAnyRecords(name, type);
else
rrsets = cache.findRecords(name, type);
if (rrsets == null)
return null;
else
return rrsets[0]; /* not quite right */
}
}
void
addRRset(Name name, Message response, RRset rrset, int section, int flags) {
for (int s = 1; s <= section; s++)
if (response.findRRset(name, rrset.getType(), s))
return;
if ((flags & FLAG_SIGONLY) == 0) {
Iterator it = rrset.rrs();
while (it.hasNext()) {
Record r = (Record) it.next();
if (r.getName().isWild() && !name.isWild())
r = r.withName(name);
response.addRecord(r, section);
}
}
if ((flags & (FLAG_SIGONLY | FLAG_DNSSECOK)) != 0) {
Iterator it = rrset.sigs();
while (it.hasNext()) {
Record r = (Record) it.next();
if (r.getName().isWild() && !name.isWild())
r = r.withName(name);
response.addRecord(r, section);
}
}
}
private final void
addSOA(Message response, Zone zone) {
response.addRecord(zone.getSOA(), Section.AUTHORITY);
}
private final void
addNS(Message response, Zone zone, int flags) {
RRset nsRecords = zone.getNS();
addRRset(nsRecords.getName(), response, nsRecords,
Section.AUTHORITY, flags);
}
private final void
addCacheNS(Message response, Cache cache, Name name) {
SetResponse sr = cache.lookupRecords(name, Type.NS, Credibility.HINT);
if (!sr.isDelegation())
return;
RRset nsRecords = sr.getNS();
Iterator it = nsRecords.rrs();
while (it.hasNext()) {
Record r = (Record) it.next();
response.addRecord(r, Section.AUTHORITY);
}
}
private void
addGlue(Message response, Name name, int flags) {
RRset a = findExactMatch(name, Type.A, DClass.IN, true);
if (a == null)
return;
addRRset(name, response, a, Section.ADDITIONAL, flags);
}
private void
addAdditional2(Message response, int section, int flags) {
Record [] records = response.getSectionArray(section);
for (int i = 0; i < records.length; i++) {
Record r = records[i];
Name glueName = r.getAdditionalName();
if (glueName != null)
addGlue(response, glueName, flags);
}
}
private final void
addAdditional(Message response, int flags) {
addAdditional2(response, Section.ANSWER, flags);
addAdditional2(response, Section.AUTHORITY, flags);
}
byte
addAnswer(Message response, Name name, int type, int dclass,
int iterations, int flags)
{
SetResponse sr;
byte rcode = Rcode.NOERROR;
if (iterations > 6)
return Rcode.NOERROR;
if (type == Type.SIG || type == Type.RRSIG) {
type = Type.ANY;
flags |= FLAG_SIGONLY;
}
Zone zone = findBestZone(name);
if (zone != null)
sr = zone.findRecords(name, type);
else {
Cache cache = getCache(dclass);
sr = cache.lookupRecords(name, type, Credibility.NORMAL);
}
if (sr.isUnknown()) {
addCacheNS(response, getCache(dclass), name);
}
if (sr.isNXDOMAIN()) {
response.getHeader().setRcode(Rcode.NXDOMAIN);
if (zone != null) {
addSOA(response, zone);
if (iterations == 0)
response.getHeader().setFlag(Flags.AA);
}
rcode = Rcode.NXDOMAIN;
}
else if (sr.isNXRRSET()) {
if (zone != null) {
addSOA(response, zone);
if (iterations == 0)
response.getHeader().setFlag(Flags.AA);
}
}
else if (sr.isDelegation()) {
RRset nsRecords = sr.getNS();
addRRset(nsRecords.getName(), response, nsRecords,
Section.AUTHORITY, flags);
}
else if (sr.isCNAME()) {
CNAMERecord cname = sr.getCNAME();
RRset rrset = new RRset(cname);
addRRset(name, response, rrset, Section.ANSWER, flags);
if (zone != null && iterations == 0)
response.getHeader().setFlag(Flags.AA);
rcode = addAnswer(response, cname.getTarget(),
type, dclass, iterations + 1, flags);
}
else if (sr.isDNAME()) {
DNAMERecord dname = sr.getDNAME();
RRset rrset = new RRset(dname);
addRRset(name, response, rrset, Section.ANSWER, flags);
Name newname;
try {
newname = name.fromDNAME(dname);
}
catch (NameTooLongException e) {
return Rcode.YXDOMAIN;
}
rrset = new RRset(new CNAMERecord(name, dclass, 0, newname));
addRRset(name, response, rrset, Section.ANSWER, flags);
if (zone != null && iterations == 0)
response.getHeader().setFlag(Flags.AA);
rcode = addAnswer(response, newname, type, dclass,
iterations + 1, flags);
}
else if (sr.isSuccessful()) {
RRset [] rrsets = sr.answers();
for (int i = 0; i < rrsets.length; i++)
addRRset(name, response, rrsets[i],
Section.ANSWER, flags);
if (zone != null) {
addNS(response, zone, flags);
if (iterations == 0)
response.getHeader().setFlag(Flags.AA);
}
else
addCacheNS(response, getCache(dclass), name);
}
return rcode;
}
byte []
doAXFR(Name name, Message query, TSIG tsig, TSIGRecord qtsig, Socket s) {
Zone zone = (Zone) znames.get(name);
boolean first = true;
if (zone == null)
return errorMessage(query, Rcode.REFUSED);
Iterator it = zone.AXFR();
try {
DataOutputStream dataOut;
dataOut = new DataOutputStream(s.getOutputStream());
int id = query.getHeader().getID();
while (it.hasNext()) {
RRset rrset = (RRset) it.next();
Message response = new Message(id);
Header header = response.getHeader();
header.setFlag(Flags.QR);
header.setFlag(Flags.AA);
addRRset(rrset.getName(), response, rrset,
Section.ANSWER, FLAG_DNSSECOK);
if (tsig != null) {
tsig.applyStream(response, qtsig, first);
qtsig = response.getTSIG();
}
first = false;
byte [] out = response.toWire();
dataOut.writeShort(out.length);
dataOut.write(out);
}
}
catch (IOException ex) {
System.out.println("AXFR failed");
}
try {
s.close();
}
catch (IOException ex) {
}
return null;
}
/*
* Note: a null return value means that the caller doesn't need to do
* anything. Currently this only happens if this is an AXFR request over
* TCP.
*/
byte []
generateReply(Message query, byte [] in, int length, Socket s)
throws IOException
{
Header header;
boolean badversion;
int maxLength;
int flags = 0;
header = query.getHeader();
if (header.getFlag(Flags.QR))
return null;
if (header.getRcode() != Rcode.NOERROR)
return errorMessage(query, Rcode.FORMERR);
if (header.getOpcode() != Opcode.QUERY)
return errorMessage(query, Rcode.NOTIMP);
Record queryRecord = query.getQuestion();
TSIGRecord queryTSIG = query.getTSIG();
TSIG tsig = null;
if (queryTSIG != null) {
tsig = (TSIG) TSIGs.get(queryTSIG.getName());
if (tsig == null ||
tsig.verify(query, in, length, null) != Rcode.NOERROR)
return formerrMessage(in);
}
OPTRecord queryOPT = query.getOPT();
if (queryOPT != null && queryOPT.getVersion() > 0)
badversion = true;
if (s != null)
maxLength = 65535;
else if (queryOPT != null)
maxLength = Math.max(queryOPT.getPayloadSize(), 512);
else
maxLength = 512;
if (queryOPT != null && (queryOPT.getFlags() & ExtendedFlags.DO) != 0)
flags = FLAG_DNSSECOK;
Message response = new Message(query.getHeader().getID());
response.getHeader().setFlag(Flags.QR);
if (query.getHeader().getFlag(Flags.RD))
response.getHeader().setFlag(Flags.RD);
response.addRecord(queryRecord, Section.QUESTION);
Name name = queryRecord.getName();
int type = queryRecord.getType();
int dclass = queryRecord.getDClass();
if (type == Type.AXFR && s != null)
return doAXFR(name, query, tsig, queryTSIG, s);
if (!Type.isRR(type) && type != Type.ANY)
return errorMessage(query, Rcode.NOTIMP);
byte rcode = addAnswer(response, name, type, dclass, 0, flags);
if (rcode != Rcode.NOERROR && rcode != Rcode.NXDOMAIN)
return errorMessage(query, rcode);
addAdditional(response, flags);
if (queryOPT != null) {
int optflags = (flags == FLAG_DNSSECOK) ? ExtendedFlags.DO : 0;
OPTRecord opt = new OPTRecord((short)4096, rcode, (byte)0,
optflags);
response.addRecord(opt, Section.ADDITIONAL);
}
response.setTSIG(tsig, Rcode.NOERROR, queryTSIG);
return response.toWire(maxLength);
}
byte []
buildErrorMessage(Header header, int rcode, Record question) {
Message response = new Message();
response.setHeader(header);
for (int i = 0; i < 4; i++)
response.removeAllRecords(i);
if (rcode == Rcode.SERVFAIL)
response.addRecord(question, Section.QUESTION);
header.setRcode(rcode);
return response.toWire();
}
public byte []
formerrMessage(byte [] in) {
Header header;
try {
header = new Header(in);
}
catch (IOException e) {
return null;
}
return buildErrorMessage(header, Rcode.FORMERR, null);
}
public byte []
errorMessage(Message query, int rcode) {
return buildErrorMessage(query.getHeader(), rcode,
query.getQuestion());
}
public void
TCPclient(Socket s) {
try {
int inLength;
DataInputStream dataIn;
DataOutputStream dataOut;
byte [] in;
InputStream is = s.getInputStream();
dataIn = new DataInputStream(is);
inLength = dataIn.readUnsignedShort();
in = new byte[inLength];
dataIn.readFully(in);
Message query;
byte [] response = null;
try {
query = new Message(in);
response = generateReply(query, in, in.length, s);
if (response == null)
return;
}
catch (IOException e) {
response = formerrMessage(in);
}
dataOut = new DataOutputStream(s.getOutputStream());
dataOut.writeShort(response.length);
dataOut.write(response);
}
catch (IOException e) {
System.out.println("TCPclient(" +
addrport(s.getLocalAddress(),
s.getLocalPort()) +
"): " + e);
}
finally {
try {
s.close();
}
catch (IOException e) {}
}
}
public void
serveTCP(InetAddress addr, int port) {
try {
ServerSocket sock = new ServerSocket(port, 128, addr);
while (true) {
final Socket s = sock.accept();
Thread t;
t = new Thread(new Runnable() {
public void run() {TCPclient(s);}});
t.start();
}
}
catch (IOException e) {
System.out.println("serveTCP(" + addrport(addr, port) + "): " +
e);
}
}
public void
serveUDP(InetAddress addr, int port) {
try {
DatagramSocket sock = new DatagramSocket(port, addr);
final short udpLength = 512;
byte [] in = new byte[udpLength];
DatagramPacket indp = new DatagramPacket(in, in.length);
DatagramPacket outdp = null;
while (true) {
indp.setLength(in.length);
try {
sock.receive(indp);
}
catch (InterruptedIOException e) {
continue;
}
Message query;
byte [] response = null;
try {
query = new Message(in);
response = generateReply(query, in,
indp.getLength(),
null);
if (response == null)
continue;
}
catch (IOException e) {
response = formerrMessage(in);
}
if (outdp == null)
outdp = new DatagramPacket(response,
response.length,
indp.getAddress(),
indp.getPort());
else {
outdp.setData(response);
outdp.setLength(response.length);
outdp.setAddress(indp.getAddress());
outdp.setPort(indp.getPort());
}
sock.send(outdp);
}
}
catch (IOException e) {
System.out.println("serveUDP(" + addrport(addr, port) + "): " +
e);
}
}
public void
addTCP(final InetAddress addr, final int port) {
Thread t;
t = new Thread(new Runnable() {
public void run() {serveTCP(addr, port);}});
t.start();
}
public void
addUDP(final InetAddress addr, final int port) {
Thread t;
t = new Thread(new Runnable() {
public void run() {serveUDP(addr, port);}});
t.start();
}
public static void main(String [] args) {
if (args.length > 1) {
System.out.println("usage: jnamed [conf]");
System.exit(0);
}
jnamed s;
try {
String conf;
if (args.length == 1)
conf = args[0];
else
conf = "jnamed.conf";
s = new jnamed(conf);
}
catch (IOException e) {
System.out.println(e);
}
catch (ZoneTransferException e) {
System.out.println(e);
}
}
}