dnsjava/src/main/java/jnamed.java at master · qutian/dnsjava · GitHub

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import java.io.*;

import java.net.*;

import java.util.*;

import org.xbill.DNS.*;

/** @author Brian Wellington <bwelling@xbill.org> */

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);

}

dnsjava/src/main/java/jnamed.java at master · qutian/dnsjava · GitHub

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