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8187443: Forest Consolidation: Move files to unified layout

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Reviewed-by: darcy, ihse
This commit is contained in:
Erik Joelsson 2017-09-12 19:03:39 +02:00
parent 270fe13182
commit 3789983e89
56923 changed files with 3 additions and 15727 deletions
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738
src/jdk.naming.dns/share/classes/com/sun/jndi/dns/DnsClient.java Normal file
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/*
* Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.jndi.dns;
import java.io.IOException;
import java.net.DatagramSocket;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.Socket;
import java.security.SecureRandom;
import javax.naming.*;
import java.util.Collections;
import java.util.Map;
import java.util.HashMap;
import sun.security.jca.JCAUtil;
// Some of this code began life as part of sun.javaos.net.DnsClient
// originally by sritchie@eng 1/96. It was first hacked up for JNDI
// use by caveh@eng 6/97.
/**
* The DnsClient class performs DNS client operations in support of DnsContext.
*
*/
public class DnsClient {
// DNS packet header field offsets
private static final int IDENT_OFFSET = 0;
private static final int FLAGS_OFFSET = 2;
private static final int NUMQ_OFFSET = 4;
private static final int NUMANS_OFFSET = 6;
private static final int NUMAUTH_OFFSET = 8;
private static final int NUMADD_OFFSET = 10;
private static final int DNS_HDR_SIZE = 12;
// DNS response codes
private static final int NO_ERROR = 0;
private static final int FORMAT_ERROR = 1;
private static final int SERVER_FAILURE = 2;
private static final int NAME_ERROR = 3;
private static final int NOT_IMPL = 4;
private static final int REFUSED = 5;
private static final String[] rcodeDescription = {
"No error",
"DNS format error",
"DNS server failure",
"DNS name not found",
"DNS operation not supported",
"DNS service refused"
};
private static final int DEFAULT_PORT = 53;
private static final int TRANSACTION_ID_BOUND = 0x10000;
private static final SecureRandom random = JCAUtil.getSecureRandom();
private InetAddress[] servers;
private int[] serverPorts;
private int timeout; // initial timeout on UDP queries in ms
private int retries; // number of UDP retries
private DatagramSocket udpSocket;
// Requests sent
private Map<Integer, ResourceRecord> reqs;
// Responses received
private Map<Integer, byte[]> resps;
//-------------------------------------------------------------------------
/*
* Each server is of the form "server[:port]". IPv6 literal host names
* include delimiting brackets.
* "timeout" is the initial timeout interval (in ms) for UDP queries,
* and "retries" gives the number of retries per server.
*/
public DnsClient(String[] servers, int timeout, int retries)
throws NamingException {
this.timeout = timeout;
this.retries = retries;
try {
udpSocket = new DatagramSocket();
} catch (java.net.SocketException e) {
NamingException ne = new ConfigurationException();
ne.setRootCause(e);
throw ne;
}
this.servers = new InetAddress[servers.length];
serverPorts = new int[servers.length];
for (int i = 0; i < servers.length; i++) {
// Is optional port given?
int colon = servers[i].indexOf(':',
servers[i].indexOf(']') + 1);
serverPorts[i] = (colon < 0)
? DEFAULT_PORT
: Integer.parseInt(servers[i].substring(colon + 1));
String server = (colon < 0)
? servers[i]
: servers[i].substring(0, colon);
try {
this.servers[i] = InetAddress.getByName(server);
} catch (java.net.UnknownHostException e) {
NamingException ne = new ConfigurationException(
"Unknown DNS server: " + server);
ne.setRootCause(e);
throw ne;
}
}
reqs = Collections.synchronizedMap(
new HashMap<Integer, ResourceRecord>());
resps = Collections.synchronizedMap(new HashMap<Integer, byte[]>());
}
@SuppressWarnings("deprecation")
protected void finalize() {
close();
}
// A lock to access the request and response queues in tandem.
private Object queuesLock = new Object();
public void close() {
udpSocket.close();
synchronized (queuesLock) {
reqs.clear();
resps.clear();
}
}
/*
* If recursion is true, recursion is requested on the query.
* If auth is true, only authoritative responses are accepted; other
* responses throw NameNotFoundException.
*/
ResourceRecords query(DnsName fqdn, int qclass, int qtype,
boolean recursion, boolean auth)
throws NamingException {
int xid;
Packet pkt;
ResourceRecord collision;
do {
// Generate a random transaction ID
xid = random.nextInt(TRANSACTION_ID_BOUND);
pkt = makeQueryPacket(fqdn, xid, qclass, qtype, recursion);
// enqueue the outstanding request
collision = reqs.putIfAbsent(xid, new ResourceRecord(pkt.getData(),
pkt.length(), Header.HEADER_SIZE, true, false));
} while (collision != null);
Exception caughtException = null;
boolean[] doNotRetry = new boolean[servers.length];
try {
//
// The UDP retry strategy is to try the 1st server, and then
// each server in order. If no answer, double the timeout
// and try each server again.
//
for (int retry = 0; retry < retries; retry++) {
// Try each name server.
for (int i = 0; i < servers.length; i++) {
if (doNotRetry[i]) {
continue;
}
// send the request packet and wait for a response.
try {
if (debug) {
dprint("SEND ID (" + (retry + 1) + "): " + xid);
}
byte[] msg = null;
msg = doUdpQuery(pkt, servers[i], serverPorts[i],
retry, xid);
//
// If the matching response is not got within the
// given timeout, check if the response was enqueued
// by some other thread, if not proceed with the next
// server or retry.
//
if (msg == null) {
if (resps.size() > 0) {
msg = lookupResponse(xid);
}
if (msg == null) { // try next server or retry
continue;
}
}
Header hdr = new Header(msg, msg.length);
if (auth && !hdr.authoritative) {
caughtException = new NameNotFoundException(
"DNS response not authoritative");
doNotRetry[i] = true;
continue;
}
if (hdr.truncated) { // message is truncated -- try TCP
// Try each server, starting with the one that just
// provided the truncated message.
for (int j = 0; j < servers.length; j++) {
int ij = (i + j) % servers.length;
if (doNotRetry[ij]) {
continue;
}
try {
Tcp tcp =
new Tcp(servers[ij], serverPorts[ij]);
byte[] msg2;
try {
msg2 = doTcpQuery(tcp, pkt);
} finally {
tcp.close();
}
Header hdr2 = new Header(msg2, msg2.length);
if (hdr2.query) {
throw new CommunicationException(
"DNS error: expecting response");
}
checkResponseCode(hdr2);
if (!auth || hdr2.authoritative) {
// Got a valid response
hdr = hdr2;
msg = msg2;
break;
} else {
doNotRetry[ij] = true;
}
} catch (Exception e) {
// Try next server, or use UDP response
}
} // servers
}
return new ResourceRecords(msg, msg.length, hdr, false);
} catch (IOException e) {
if (debug) {
dprint("Caught IOException:" + e);
}
if (caughtException == null) {
caughtException = e;
}
// Use reflection to allow pre-1.4 compilation.
// This won't be needed much longer.
if (e.getClass().getName().equals(
"java.net.PortUnreachableException")) {
doNotRetry[i] = true;
}
} catch (NameNotFoundException e) {
// This is authoritative, so return immediately
throw e;
} catch (CommunicationException e) {
if (caughtException == null) {
caughtException = e;
}
} catch (NamingException e) {
if (caughtException == null) {
caughtException = e;
}
doNotRetry[i] = true;
}
} // servers
} // retries
} finally {
reqs.remove(xid); // cleanup
}
if (caughtException instanceof NamingException) {
throw (NamingException) caughtException;
}
// A network timeout or other error occurred.
NamingException ne = new CommunicationException("DNS error");
ne.setRootCause(caughtException);
throw ne;
}
ResourceRecords queryZone(DnsName zone, int qclass, boolean recursion)
throws NamingException {
int xid = random.nextInt(TRANSACTION_ID_BOUND);
Packet pkt = makeQueryPacket(zone, xid, qclass,
ResourceRecord.QTYPE_AXFR, recursion);
Exception caughtException = null;
// Try each name server.
for (int i = 0; i < servers.length; i++) {
try {
Tcp tcp = new Tcp(servers[i], serverPorts[i]);
byte[] msg;
try {
msg = doTcpQuery(tcp, pkt);
Header hdr = new Header(msg, msg.length);
// Check only rcode as per
// draft-ietf-dnsext-axfr-clarify-04
checkResponseCode(hdr);
ResourceRecords rrs =
new ResourceRecords(msg, msg.length, hdr, true);
if (rrs.getFirstAnsType() != ResourceRecord.TYPE_SOA) {
throw new CommunicationException(
"DNS error: zone xfer doesn't begin with SOA");
}
if (rrs.answer.size() == 1 ||
rrs.getLastAnsType() != ResourceRecord.TYPE_SOA) {
// The response is split into multiple DNS messages.
do {
msg = continueTcpQuery(tcp);
if (msg == null) {
throw new CommunicationException(
"DNS error: incomplete zone transfer");
}
hdr = new Header(msg, msg.length);
checkResponseCode(hdr);
rrs.add(msg, msg.length, hdr);
} while (rrs.getLastAnsType() !=
ResourceRecord.TYPE_SOA);
}
// Delete the duplicate SOA record.
rrs.answer.removeElementAt(rrs.answer.size() - 1);
return rrs;
} finally {
tcp.close();
}
} catch (IOException e) {
caughtException = e;
} catch (NameNotFoundException e) {
throw e;
} catch (NamingException e) {
caughtException = e;
}
}
if (caughtException instanceof NamingException) {
throw (NamingException) caughtException;
}
NamingException ne = new CommunicationException(
"DNS error during zone transfer");
ne.setRootCause(caughtException);
throw ne;
}
/**
* Tries to retrieve a UDP packet matching the given xid
* received within the timeout.
* If a packet with different xid is received, the received packet
* is enqueued with the corresponding xid in 'resps'.
*/
private byte[] doUdpQuery(Packet pkt, InetAddress server,
int port, int retry, int xid)
throws IOException, NamingException {
int minTimeout = 50; // msec after which there are no retries.
synchronized (udpSocket) {
DatagramPacket opkt = new DatagramPacket(
pkt.getData(), pkt.length(), server, port);
DatagramPacket ipkt = new DatagramPacket(new byte[8000], 8000);
// Packets may only be sent to or received from this server address
udpSocket.connect(server, port);
int pktTimeout = (timeout * (1 << retry));
try {
udpSocket.send(opkt);
// timeout remaining after successive 'receive()'
int timeoutLeft = pktTimeout;
int cnt = 0;
do {
if (debug) {
cnt++;
dprint("Trying RECEIVE(" +
cnt + ") retry(" + (retry + 1) +
") for:" + xid + " sock-timeout:" +
timeoutLeft + " ms.");
}
udpSocket.setSoTimeout(timeoutLeft);
long start = System.currentTimeMillis();
udpSocket.receive(ipkt);
long end = System.currentTimeMillis();
byte[] data = ipkt.getData();
if (isMatchResponse(data, xid)) {
return data;
}
timeoutLeft = pktTimeout - ((int) (end - start));
} while (timeoutLeft > minTimeout);
} finally {
udpSocket.disconnect();
}
return null; // no matching packet received within the timeout
}
}
/*
* Sends a TCP query, and returns the first DNS message in the response.
*/
private byte[] doTcpQuery(Tcp tcp, Packet pkt) throws IOException {
int len = pkt.length();
// Send 2-byte message length, then send message.
tcp.out.write(len >> 8);
tcp.out.write(len);
tcp.out.write(pkt.getData(), 0, len);
tcp.out.flush();
byte[] msg = continueTcpQuery(tcp);
if (msg == null) {
throw new IOException("DNS error: no response");
}
return msg;
}
/*
* Returns the next DNS message from the TCP socket, or null on EOF.
*/
private byte[] continueTcpQuery(Tcp tcp) throws IOException {
int lenHi = tcp.in.read(); // high-order byte of response length
if (lenHi == -1) {
return null; // EOF
}
int lenLo = tcp.in.read(); // low-order byte of response length
if (lenLo == -1) {
throw new IOException("Corrupted DNS response: bad length");
}
int len = (lenHi << 8) | lenLo;
byte[] msg = new byte[len];
int pos = 0; // next unfilled position in msg
while (len > 0) {
int n = tcp.in.read(msg, pos, len);
if (n == -1) {
throw new IOException(
"Corrupted DNS response: too little data");
}
len -= n;
pos += n;
}
return msg;
}
private Packet makeQueryPacket(DnsName fqdn, int xid,
int qclass, int qtype, boolean recursion) {
int qnameLen = fqdn.getOctets();
int pktLen = DNS_HDR_SIZE + qnameLen + 4;
Packet pkt = new Packet(pktLen);
short flags = recursion ? Header.RD_BIT : 0;
pkt.putShort(xid, IDENT_OFFSET);
pkt.putShort(flags, FLAGS_OFFSET);
pkt.putShort(1, NUMQ_OFFSET);
pkt.putShort(0, NUMANS_OFFSET);
pkt.putInt(0, NUMAUTH_OFFSET);
makeQueryName(fqdn, pkt, DNS_HDR_SIZE);
pkt.putShort(qtype, DNS_HDR_SIZE + qnameLen);
pkt.putShort(qclass, DNS_HDR_SIZE + qnameLen + 2);
return pkt;
}
// Builds a query name in pkt according to the RFC spec.
private void makeQueryName(DnsName fqdn, Packet pkt, int off) {
// Loop through labels, least-significant first.
for (int i = fqdn.size() - 1; i >= 0; i--) {
String label = fqdn.get(i);
int len = label.length();
pkt.putByte(len, off++);
for (int j = 0; j < len; j++) {
pkt.putByte(label.charAt(j), off++);
}
}
if (!fqdn.hasRootLabel()) {
pkt.putByte(0, off);
}
}
//-------------------------------------------------------------------------
private byte[] lookupResponse(Integer xid) throws NamingException {
//
// Check the queued responses: some other thread in between
// received the response for this request.
//
if (debug) {
dprint("LOOKUP for: " + xid +
"\tResponse Q:" + resps);
}
byte[] pkt;
if ((pkt = resps.get(xid)) != null) {
checkResponseCode(new Header(pkt, pkt.length));
synchronized (queuesLock) {
resps.remove(xid);
reqs.remove(xid);
}
if (debug) {
dprint("FOUND (" + Thread.currentThread() +
") for:" + xid);
}
}
return pkt;
}
/*
* Checks the header of an incoming DNS response.
* Returns true if it matches the given xid and throws a naming
* exception, if appropriate, based on the response code.
*
* Also checks that the domain name, type and class in the response
* match those in the original query.
*/
private boolean isMatchResponse(byte[] pkt, int xid)
throws NamingException {
Header hdr = new Header(pkt, pkt.length);
if (hdr.query) {
throw new CommunicationException("DNS error: expecting response");
}
if (!reqs.containsKey(xid)) { // already received, ignore the response
return false;
}
// common case- the request sent matches the subsequent response read
if (hdr.xid == xid) {
if (debug) {
dprint("XID MATCH:" + xid);
}
checkResponseCode(hdr);
if (!hdr.query && hdr.numQuestions == 1) {
ResourceRecord rr = new ResourceRecord(pkt, pkt.length,
Header.HEADER_SIZE, true, false);
// Retrieve the original query
ResourceRecord query = reqs.get(xid);
int qtype = query.getType();
int qclass = query.getRrclass();
DnsName qname = query.getName();
// Check that the type/class/name in the query section of the
// response match those in the original query
if ((qtype == ResourceRecord.QTYPE_STAR ||
qtype == rr.getType()) &&
(qclass == ResourceRecord.QCLASS_STAR ||
qclass == rr.getRrclass()) &&
qname.equals(rr.getName())) {
if (debug) {
dprint("MATCH NAME:" + qname + " QTYPE:" + qtype +
" QCLASS:" + qclass);
}
// Remove the response for the xid if received by some other
// thread.
synchronized (queuesLock) {
resps.remove(xid);
reqs.remove(xid);
}
return true;
} else {
if (debug) {
dprint("NO-MATCH NAME:" + qname + " QTYPE:" + qtype +
" QCLASS:" + qclass);
}
}
}
return false;
}
//
// xid mis-match: enqueue the response, it may belong to some other
// thread that has not yet had a chance to read its response.
// enqueue only the first response, responses for retries are ignored.
//
synchronized (queuesLock) {
if (reqs.containsKey(hdr.xid)) { // enqueue only the first response
resps.put(hdr.xid, pkt);
}
}
if (debug) {
dprint("NO-MATCH SEND ID:" +
xid + " RECVD ID:" + hdr.xid +
" Response Q:" + resps +
" Reqs size:" + reqs.size());
}
return false;
}
/*
* Throws an exception if appropriate for the response code of a
* given header.
*/
private void checkResponseCode(Header hdr) throws NamingException {
int rcode = hdr.rcode;
if (rcode == NO_ERROR) {
return;
}
String msg = (rcode < rcodeDescription.length)
? rcodeDescription[rcode]
: "DNS error";
msg += " [response code " + rcode + "]";
switch (rcode) {
case SERVER_FAILURE:
throw new ServiceUnavailableException(msg);
case NAME_ERROR:
throw new NameNotFoundException(msg);
case NOT_IMPL:
case REFUSED:
throw new OperationNotSupportedException(msg);
case FORMAT_ERROR:
default:
throw new NamingException(msg);
}
}
//-------------------------------------------------------------------------
private static final boolean debug = false;
private static void dprint(String mess) {
if (debug) {
System.err.println("DNS: " + mess);
}
}
}
class Tcp {
private Socket sock;
java.io.InputStream in;
java.io.OutputStream out;
Tcp(InetAddress server, int port) throws IOException {
sock = new Socket(server, port);
sock.setTcpNoDelay(true);
out = new java.io.BufferedOutputStream(sock.getOutputStream());
in = new java.io.BufferedInputStream(sock.getInputStream());
}
void close() throws IOException {
sock.close();
}
}
/*
* javaos emulation -cj
*/
class Packet {
byte buf[];
Packet(int len) {
buf = new byte[len];
}
Packet(byte data[], int len) {
buf = new byte[len];
System.arraycopy(data, 0, buf, 0, len);
}
void putInt(int x, int off) {
buf[off + 0] = (byte)(x >> 24);
buf[off + 1] = (byte)(x >> 16);
buf[off + 2] = (byte)(x >> 8);
buf[off + 3] = (byte)x;
}
void putShort(int x, int off) {
buf[off + 0] = (byte)(x >> 8);
buf[off + 1] = (byte)x;
}
void putByte(int x, int off) {
buf[off] = (byte)x;
}
void putBytes(byte src[], int src_offset, int dst_offset, int len) {
System.arraycopy(src, src_offset, buf, dst_offset, len);
}
int length() {
return buf.length;
}
byte[] getData() {
return buf;
}
}

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src/jdk.naming.dns/share/classes/com/sun/jndi/dns/DnsContext.java Normal file
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src/jdk.naming.dns/share/classes/com/sun/jndi/dns/DnsContextFactory.java Normal file
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/*
* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.jndi.dns;
import java.net.MalformedURLException;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.List;
import javax.naming.*;
import javax.naming.spi.*;
import com.sun.jndi.toolkit.url.UrlUtil;
import sun.net.dns.ResolverConfiguration; // available since 1.4.1
/**
* A DnsContextFactory serves as the initial context factory for DNS.
*
* <p> When an initial context is being created, the environment
* property "java.naming.provider.url" should contain a DNS pseudo-URL
* (see DnsUrl) or a space-separated list of them. Multiple URLs must
* all have the same domain value.
* If the property is not set, the default "dns:" is used.
*
* @author Scott Seligman
*/
public class DnsContextFactory implements InitialContextFactory {
private static final String DEFAULT_URL = "dns:";
private static final int DEFAULT_PORT = 53;
public Context getInitialContext(Hashtable<?,?> env) throws NamingException {
if (env == null) {
env = new Hashtable<>(5);
}
return urlToContext(getInitCtxUrl(env), env);
}
public static DnsContext getContext(String domain,
String[] servers, Hashtable<?,?> env)
throws NamingException {
return new DnsContext(domain, servers, env);
}
/*
* "urls" are used to determine the servers, but any domain
* components are overridden by "domain".
*/
public static DnsContext getContext(String domain,
DnsUrl[] urls, Hashtable<?,?> env)
throws NamingException {
String[] servers = serversForUrls(urls);
DnsContext ctx = getContext(domain, servers, env);
if (platformServersUsed(urls)) {
ctx.setProviderUrl(constructProviderUrl(domain, servers));
}
return ctx;
}
/*
* Public for use by product test suite.
*/
public static boolean platformServersAvailable() {
return !filterNameServers(
ResolverConfiguration.open().nameservers(), true
).isEmpty();
}
private static Context urlToContext(String url, Hashtable<?,?> env)
throws NamingException {
DnsUrl[] urls;
try {
urls = DnsUrl.fromList(url);
} catch (MalformedURLException e) {
throw new ConfigurationException(e.getMessage());
}
if (urls.length == 0) {
throw new ConfigurationException(
"Invalid DNS pseudo-URL(s): " + url);
}
String domain = urls[0].getDomain();
// If multiple urls, all must have the same domain.
for (int i = 1; i < urls.length; i++) {
if (!domain.equalsIgnoreCase(urls[i].getDomain())) {
throw new ConfigurationException(
"Conflicting domains: " + url);
}
}
return getContext(domain, urls, env);
}
/*
* Returns all the servers specified in a set of URLs.
* If a URL has no host (or port), the servers configured on the
* underlying platform are used if possible. If no configured
* servers can be found, then fall back to the old behavior of
* using "localhost".
* There must be at least one URL.
*/
private static String[] serversForUrls(DnsUrl[] urls)
throws NamingException {
if (urls.length == 0) {
throw new ConfigurationException("DNS pseudo-URL required");
}
List<String> servers = new ArrayList<>();
for (int i = 0; i < urls.length; i++) {
String server = urls[i].getHost();
int port = urls[i].getPort();
if (server == null && port < 0) {
// No server or port given, so look to underlying platform.
// ResolverConfiguration does some limited caching, so the
// following is reasonably efficient even if called rapid-fire.
List<String> platformServers = filterNameServers(
ResolverConfiguration.open().nameservers(), false);
if (!platformServers.isEmpty()) {
servers.addAll(platformServers);
continue; // on to next URL (if any, which is unlikely)
}
}
if (server == null) {
server = "localhost";
}
servers.add((port < 0)
? server
: server + ":" + port);
}
return servers.toArray(new String[servers.size()]);
}
/*
* Returns true if serversForUrls(urls) would make use of servers
* from the underlying platform.
*/
private static boolean platformServersUsed(DnsUrl[] urls) {
if (!platformServersAvailable()) {
return false;
}
for (int i = 0; i < urls.length; i++) {
if (urls[i].getHost() == null &&
urls[i].getPort() < 0) {
return true;
}
}
return false;
}
/*
* Returns a value for the PROVIDER_URL property (space-separated URL
* Strings) that reflects the given domain and servers.
* Each server is of the form "server[:port]".
* There must be at least one server.
* IPv6 literal host names include delimiting brackets.
*/
private static String constructProviderUrl(String domain,
String[] servers) {
String path = "";
if (!domain.equals(".")) {
try {
path = "/" + UrlUtil.encode(domain, "ISO-8859-1");
} catch (java.io.UnsupportedEncodingException e) {
// assert false : "ISO-Latin-1 charset unavailable";
}
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < servers.length; i++) {
if (i > 0) {
sb.append(' ');
}
sb.append("dns://").append(servers[i]).append(path);
}
return sb.toString();
}
/*
* Reads environment to find URL(s) of initial context.
* Default URL is "dns:".
*/
private static String getInitCtxUrl(Hashtable<?,?> env) {
String url = (String) env.get(Context.PROVIDER_URL);
return ((url != null) ? url : DEFAULT_URL);
}
/**
* Removes any DNS server that's not permitted to access
* @param input the input server[:port] list, must not be null
* @param oneIsEnough return output once there exists one ok
* @return the filtered list, all non-permitted input removed
*/
private static List<String> filterNameServers(List<String> input, boolean oneIsEnough) {
SecurityManager security = System.getSecurityManager();
if (security == null || input == null || input.isEmpty()) {
return input;
} else {
List<String> output = new ArrayList<>();
for (String platformServer: input) {
int colon = platformServer.indexOf(':',
platformServer.indexOf(']') + 1);
int p = (colon < 0)
? DEFAULT_PORT
: Integer.parseInt(
platformServer.substring(colon + 1));
String s = (colon < 0)
? platformServer
: platformServer.substring(0, colon);
try {
security.checkConnect(s, p);
output.add(platformServer);
if (oneIsEnough) {
return output;
}
} catch (SecurityException se) {
continue;
}
}
return output;
}
}
}

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/*
* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.jndi.dns;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.Enumeration;
import javax.naming.*;
/**
* {@code DnsName} implements compound names for DNS as specified by
* RFCs 1034 and 1035, and as updated and clarified by RFCs 1123 and 2181.
*
* <p> The labels in a domain name correspond to JNDI atomic names.
* Each label must be less than 64 octets in length, and only the
* optional root label at the end of the name may be 0 octets long.
* The sum of the lengths of all labels in a name, plus the number of
* non-root labels plus 1, must be less than 256. The textual
* representation of a domain name consists of the labels, escaped as
* needed, dot-separated, and ordered right-to-left.
*
* <p> A label consists of a sequence of octets, each of which may
* have any value from 0 to 255.
*
* <p> <em>Host names</em> are a subset of domain names.
* Their labels contain only ASCII letters, digits, and hyphens, and
* none may begin or end with a hyphen. While names not conforming to
* these rules may be valid domain names, they will not be usable by a
* number of DNS applications, and should in most cases be avoided.
*
* <p> DNS does not specify an encoding (such as UTF-8) to use for
* octets with non-ASCII values. As of this writing there is some
* work going on in this area, but it is not yet finalized.
* {@code DnsName} currently converts any non-ASCII octets into
* characters using ISO-LATIN-1 encoding, in effect taking the
* value of each octet and storing it directly into the low-order byte
* of a Java character and <i>vice versa</i>. As a consequence, no
* character in a DNS name will ever have a non-zero high-order byte.
* When the work on internationalizing domain names has stabilized
* (see for example <i>draft-ietf-idn-idna-10.txt</i>), {@code DnsName}
* may be updated to conform to that work.
*
* <p> Backslash ({@code \}) is used as the escape character in the
* textual representation of a domain name. The character sequence
* `{@code \DDD}', where {@code DDD} is a 3-digit decimal number
* (with leading zeros if needed), represents the octet whose value
* is {@code DDD}. The character sequence `{@code \C}', where
* {@code C} is a character other than {@code '0'} through
* {@code '9'}, represents the octet whose value is that of
* {@code C} (again using ISO-LATIN-1 encoding); this is particularly
* useful for escaping {@code '.'} or backslash itself. Backslash is
* otherwise not allowed in a domain name. Note that escape characters
* are interpreted when a name is parsed. So, for example, the character
* sequences `{@code S}', `{@code \S}', and `{@code \083}' each
* represent the same one-octet name. The {@code toString()} method
* does not generally insert escape sequences except where necessary.
* If, however, the {@code DnsName} was constructed using unneeded
* escapes, those escapes may appear in the {@code toString} result.
*
* <p> Atomic names passed as parameters to methods of
* {@code DnsName}, and those returned by them, are unescaped. So,
* for example, <code>(new&nbsp;DnsName()).add("a.b")</code> creates an
* object representing the one-label domain name {@code a\.b}, and
* calling {@code get(0)} on this object returns {@code "a.b"}.
*
* <p> While DNS names are case-preserving, comparisons between them
* are case-insensitive. When comparing names containing non-ASCII
* octets, {@code DnsName} uses case-insensitive comparison
* between pairs of ASCII values, and exact binary comparison
* otherwise.
* <p> A {@code DnsName} instance is not synchronized against
* concurrent access by multiple threads.
*
* @author Scott Seligman
*/
public final class DnsName implements Name {
// If non-null, the domain name represented by this DnsName.
private String domain = "";
// The labels of this domain name, as a list of strings. Index 0
// corresponds to the leftmost (least significant) label: note that
// this is the reverse of the ordering used by the Name interface.
private ArrayList<String> labels = new ArrayList<>();
// The number of octets needed to carry this domain name in a DNS
// packet. Equal to the sum of the lengths of each label, plus the
// number of non-root labels, plus 1. Must remain less than 256.
private short octets = 1;
/**
* Constructs a {@code DnsName} representing the empty domain name.
*/
public DnsName() {
}
/**
* Constructs a {@code DnsName} representing a given domain name.
*
* @param name the domain name to parse
* @throws InvalidNameException if {@code name} does not conform
* to DNS syntax.
*/
public DnsName(String name) throws InvalidNameException {
parse(name);
}
/*
* Returns a new DnsName with its name components initialized to
* the components of "n" in the range [beg,end). Indexing is as
* for the Name interface, with 0 being the most significant.
*/
private DnsName(DnsName n, int beg, int end) {
// Compute indexes into "labels", which has least-significant label
// at index 0 (opposite to the convention used for "beg" and "end").
int b = n.size() - end;
int e = n.size() - beg;
labels.addAll(n.labels.subList(b, e));
if (size() == n.size()) {
domain = n.domain;
octets = n.octets;
} else {
for (String label: labels) {
if (label.length() > 0) {
octets += (short) (label.length() + 1);
}
}
}
}
public String toString() {
if (domain == null) {
StringBuilder buf = new StringBuilder();
for (String label: labels) {
if (buf.length() > 0 || label.length() == 0) {
buf.append('.');
}
escape(buf, label);
}
domain = buf.toString();
}
return domain;
}
/**
* Does this domain name follow <em>host name</em> syntax?
*/
public boolean isHostName() {
for (String label: labels) {
if (!isHostNameLabel(label)) {
return false;
}
}
return true;
}
public short getOctets() {
return octets;
}
public int size() {
return labels.size();
}
public boolean isEmpty() {
return (size() == 0);
}
public int hashCode() {
int h = 0;
for (int i = 0; i < size(); i++) {
h = 31 * h + getKey(i).hashCode();
}
return h;
}
public boolean equals(Object obj) {
if (!(obj instanceof Name) || (obj instanceof CompositeName)) {
return false;
}
Name n = (Name) obj;
return ((size() == n.size()) && // shortcut: do sizes differ?
(compareTo(obj) == 0));
}
public int compareTo(Object obj) {
Name n = (Name) obj;
return compareRange(0, size(), n); // never 0 if sizes differ
}
public boolean startsWith(Name n) {
return ((size() >= n.size()) &&
(compareRange(0, n.size(), n) == 0));
}
public boolean endsWith(Name n) {
return ((size() >= n.size()) &&
(compareRange(size() - n.size(), size(), n) == 0));
}
public String get(int pos) {
if (pos < 0 || pos >= size()) {
throw new ArrayIndexOutOfBoundsException();
}
int i = size() - pos - 1; // index of "pos" component in "labels"
return labels.get(i);
}
public Enumeration<String> getAll() {
return new Enumeration<String>() {
int pos = 0;
public boolean hasMoreElements() {
return (pos < size());
}
public String nextElement() {
if (pos < size()) {
return get(pos++);
}
throw new java.util.NoSuchElementException();
}
};
}
public Name getPrefix(int pos) {
return new DnsName(this, 0, pos);
}
public Name getSuffix(int pos) {
return new DnsName(this, pos, size());
}
public Object clone() {
return new DnsName(this, 0, size());
}
public Object remove(int pos) {
if (pos < 0 || pos >= size()) {
throw new ArrayIndexOutOfBoundsException();
}
int i = size() - pos - 1; // index of element to remove in "labels"
String label = labels.remove(i);
int len = label.length();
if (len > 0) {
octets -= (short) (len + 1);
}
domain = null; // invalidate "domain"
return label;
}
public Name add(String comp) throws InvalidNameException {
return add(size(), comp);
}
public Name add(int pos, String comp) throws InvalidNameException {
if (pos < 0 || pos > size()) {
throw new ArrayIndexOutOfBoundsException();
}
// Check for empty labels: may have only one, and only at end.
int len = comp.length();
if ((pos > 0 && len == 0) ||
(pos == 0 && hasRootLabel())) {
throw new InvalidNameException(
"Empty label must be the last label in a domain name");
}
// Check total name length.
if (len > 0) {
if (octets + len + 1 >= 256) {
throw new InvalidNameException("Name too long");
}
octets += (short) (len + 1);
}
int i = size() - pos; // index for insertion into "labels"
verifyLabel(comp);
labels.add(i, comp);
domain = null; // invalidate "domain"
return this;
}
public Name addAll(Name suffix) throws InvalidNameException {
return addAll(size(), suffix);
}
public Name addAll(int pos, Name n) throws InvalidNameException {
if (n instanceof DnsName) {
// "n" is a DnsName so we can insert it as a whole, rather than
// verifying and inserting it component-by-component.
// More code, but less work.
DnsName dn = (DnsName) n;
if (dn.isEmpty()) {
return this;
}
// Check for empty labels: may have only one, and only at end.
if ((pos > 0 && dn.hasRootLabel()) ||
(pos == 0 && hasRootLabel())) {
throw new InvalidNameException(
"Empty label must be the last label in a domain name");
}
short newOctets = (short) (octets + dn.octets - 1);
if (newOctets > 255) {
throw new InvalidNameException("Name too long");
}
octets = newOctets;
int i = size() - pos; // index for insertion into "labels"
labels.addAll(i, dn.labels);
// Preserve "domain" if we're appending or prepending,
// otherwise invalidate it.
if (isEmpty()) {
domain = dn.domain;
} else if (domain == null || dn.domain == null) {
domain = null;
} else if (pos == 0) {
domain += (dn.domain.equals(".") ? "" : ".") + dn.domain;
} else if (pos == size()) {
domain = dn.domain + (domain.equals(".") ? "" : ".") + domain;
} else {
domain = null;
}
} else if (n instanceof CompositeName) {
n = (DnsName) n; // force ClassCastException
} else { // "n" is a compound name, but not a DnsName.
// Add labels least-significant first: sometimes more efficient.
for (int i = n.size() - 1; i >= 0; i--) {
add(pos, n.get(i));
}
}
return this;
}
boolean hasRootLabel() {
return (!isEmpty() &&
get(0).equals(""));
}
/*
* Helper method for public comparison methods. Lexicographically
* compares components of this name in the range [beg,end) with
* all components of "n". Indexing is as for the Name interface,
* with 0 being the most significant. Returns negative, zero, or
* positive as these name components are less than, equal to, or
* greater than those of "n".
*/
private int compareRange(int beg, int end, Name n) {
if (n instanceof CompositeName) {
n = (DnsName) n; // force ClassCastException
}
// Loop through labels, starting with most significant.
int minSize = Math.min(end - beg, n.size());
for (int i = 0; i < minSize; i++) {
String label1 = get(i + beg);
String label2 = n.get(i);
int j = size() - (i + beg) - 1; // index of label1 in "labels"
// assert (label1 == labels.get(j));
int c = compareLabels(label1, label2);
if (c != 0) {
return c;
}
}
return ((end - beg) - n.size()); // longer range wins
}
/*
* Returns a key suitable for hashing the label at index i.
* Indexing is as for the Name interface, with 0 being the most
* significant.
*/
String getKey(int i) {
return keyForLabel(get(i));
}
/*
* Parses a domain name, setting the values of instance vars accordingly.
*/
private void parse(String name) throws InvalidNameException {
StringBuilder label = new StringBuilder(); // label being parsed
for (int i = 0; i < name.length(); i++) {
char c = name.charAt(i);
if (c == '\\') { // found an escape sequence
c = getEscapedOctet(name, i++);
if (isDigit(name.charAt(i))) { // sequence is \DDD
i += 2; // consume remaining digits
}
label.append(c);
} else if (c != '.') { // an unescaped octet
label.append(c);
} else { // found '.' separator
add(0, label.toString()); // check syntax, then add label
// to end of name
label.delete(0, i); // clear buffer for next label
}
}
// If name is neither "." nor "", the octets (zero or more)
// from the rightmost dot onward are now added as the final
// label of the name. Those two are special cases in that for
// all other domain names, the number of labels is one greater
// than the number of dot separators.
if (!name.equals("") && !name.equals(".")) {
add(0, label.toString());
}
domain = name; // do this last, since add() sets it to null
}
/*
* Returns (as a char) the octet indicated by the escape sequence
* at a given position within a domain name.
* @throws InvalidNameException if a valid escape sequence is not found.
*/
private static char getEscapedOctet(String name, int pos)
throws InvalidNameException {
try {
// assert (name.charAt(pos) == '\\');
char c1 = name.charAt(++pos);
if (isDigit(c1)) { // sequence is `\DDD'
char c2 = name.charAt(++pos);
char c3 = name.charAt(++pos);
if (isDigit(c2) && isDigit(c3)) {
return (char)
((c1 - '0') * 100 + (c2 - '0') * 10 + (c3 - '0'));
} else {
throw new InvalidNameException(
"Invalid escape sequence in " + name);
}
} else { // sequence is `\C'
return c1;
}
} catch (IndexOutOfBoundsException e) {
throw new InvalidNameException(
"Invalid escape sequence in " + name);
}
}
/*
* Checks that this label is valid.
* @throws InvalidNameException if label is not valid.
*/
private static void verifyLabel(String label) throws InvalidNameException {
if (label.length() > 63) {
throw new InvalidNameException(
"Label exceeds 63 octets: " + label);
}
// Check for two-byte characters.
for (int i = 0; i < label.length(); i++) {
char c = label.charAt(i);
if ((c & 0xFF00) != 0) {
throw new InvalidNameException(
"Label has two-byte char: " + label);
}
}
}
/*
* Does this label conform to host name syntax?
*/
private static boolean isHostNameLabel(String label) {
for (int i = 0; i < label.length(); i++) {
char c = label.charAt(i);
if (!isHostNameChar(c)) {
return false;
}
}
return !(label.startsWith("-") || label.endsWith("-"));
}
private static boolean isHostNameChar(char c) {
return (c == '-' ||
c >= 'a' && c <= 'z' ||
c >= 'A' && c <= 'Z' ||
c >= '0' && c <= '9');
}
private static boolean isDigit(char c) {
return (c >= '0' && c <= '9');
}
/*
* Append a label to buf, escaping as needed.
*/
private static void escape(StringBuilder buf, String label) {
for (int i = 0; i < label.length(); i++) {
char c = label.charAt(i);
if (c == '.' || c == '\\') {
buf.append('\\');
}
buf.append(c);
}
}
/*
* Compares two labels, ignoring case for ASCII values.
* Returns negative, zero, or positive as the first label
* is less than, equal to, or greater than the second.
* See keyForLabel().
*/
private static int compareLabels(String label1, String label2) {
int min = Math.min(label1.length(), label2.length());
for (int i = 0; i < min; i++) {
char c1 = label1.charAt(i);
char c2 = label2.charAt(i);
if (c1 >= 'A' && c1 <= 'Z') {
c1 += 'a' - 'A'; // to lower case
}
if (c2 >= 'A' && c2 <= 'Z') {
c2 += 'a' - 'A'; // to lower case
}
if (c1 != c2) {
return (c1 - c2);
}
}
return (label1.length() - label2.length()); // the longer one wins
}
/*
* Returns a key suitable for hashing a label. Two labels map to
* the same key iff they are equal, taking possible case-folding
* into account. See compareLabels().
*/
private static String keyForLabel(String label) {
StringBuilder sb = new StringBuilder(label.length());
for (int i = 0; i < label.length(); i++) {
char c = label.charAt(i);
if (c >= 'A' && c <= 'Z') {
c += 'a' - 'A'; // to lower case
}
sb.append(c);
}
return sb.toString();
}
/**
* Serializes only the domain name string, for compactness and to avoid
* any implementation dependency.
*
* @serialData The domain name string.
*/
private void writeObject(java.io.ObjectOutputStream s)
throws java.io.IOException {
s.writeObject(toString());
}
private void readObject(java.io.ObjectInputStream s)
throws java.io.IOException, ClassNotFoundException {
try {
parse((String) s.readObject());
} catch (InvalidNameException e) {
// shouldn't happen
throw new java.io.StreamCorruptedException(
"Invalid name: " + domain);
}
}
private static final long serialVersionUID = 7040187611324710271L;
}

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/*
* Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.jndi.dns;
import javax.naming.*;
/**
* A name parser for DNS names.
*
* @author Scott Seligman
*/
class DnsNameParser implements NameParser {
public Name parse(String name) throws NamingException {
return new DnsName(name);
}
// Every DnsNameParser is created equal.
public boolean equals(Object obj) {
return (obj instanceof DnsNameParser);
}
public int hashCode() {
return DnsNameParser.class.hashCode() + 1;
}
}

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/*
* Copyright (c) 2000, 2002, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.jndi.dns;
import java.net.MalformedURLException;
import java.util.Hashtable;
import java.util.StringTokenizer;
import com.sun.jndi.toolkit.url.Uri;
import com.sun.jndi.toolkit.url.UrlUtil;
/**
* A DnsUrl represents a DNS pseudo-URL of the form
* <pre>
* dns://[host][:port][/[domain]]
* or
* dns:[/][domain]
* </pre>
* The host names a DNS server. If the host is not provided, it
* indicates that the underlying platform's DNS server(s) should be
* used if possible, or that "localhost" should be used otherwise. If
* the port is not provided, the DNS default port 53 will be used.
* The domain indicates the domain name of the context, and is not
* necessarily related to the domain of the server; if it is not
* provided, the root domain "." is used. Special characters in
* the domain name must be %-escaped as described in RFC 2396.
*
* @author Scott Seligman
*/
public class DnsUrl extends Uri {
private String domain; // domain name of the context
/**
* Given a space-separated list of DNS URLs, returns an array of DnsUrl
* objects.
*/
public static DnsUrl[] fromList(String urlList)
throws MalformedURLException {
DnsUrl[] urls = new DnsUrl[(urlList.length() + 1) / 2];
int i = 0; // next available index in urls
StringTokenizer st = new StringTokenizer(urlList, " ");
while (st.hasMoreTokens()) {
urls[i++] = new DnsUrl(st.nextToken());
}
DnsUrl[] trimmed = new DnsUrl[i];
System.arraycopy(urls, 0, trimmed, 0, i);
return trimmed;
}
public DnsUrl(String url) throws MalformedURLException {
super(url);
if (!scheme.equals("dns")) {
throw new MalformedURLException(
url + " is not a valid DNS pseudo-URL");
}
domain = path.startsWith("/")
? path.substring(1)
: path;
domain = domain.equals("")
? "."
: UrlUtil.decode(domain);
// Debug
// System.out.println("host=" + host + " port=" + port +
// " domain=" + domain);
}
/**
* Returns the domain of this URL, or "." if none is provided.
* Never null.
*/
public String getDomain() {
return domain;
}
/*
// Debug
public static void main(String args[]) throws MalformedURLException {
DnsUrl[] urls = fromList(args[0]);
for (int i = 0; i < urls.length; i++) {
System.out.println(urls[i].toString());
}
}
*/
}

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/*
* Copyright (c) 2000, 2002, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.jndi.dns;
import javax.naming.*;
/**
* The Header class represents the header of a DNS message.
*
* @author Scott Seligman
*/
class Header {
static final int HEADER_SIZE = 12; // octets in a DNS header
// Masks and shift amounts for DNS header flag fields.
static final short QR_BIT = (short) 0x8000;
static final short OPCODE_MASK = (short) 0x7800;
static final int OPCODE_SHIFT = 11;
static final short AA_BIT = (short) 0x0400;
static final short TC_BIT = (short) 0x0200;
static final short RD_BIT = (short) 0x0100;
static final short RA_BIT = (short) 0x0080;
static final short RCODE_MASK = (short) 0x000F;
int xid; // ID: 16-bit query identifier
boolean query; // QR: true if query, false if response
int opcode; // OPCODE: 4-bit opcode
boolean authoritative; // AA
boolean truncated; // TC
boolean recursionDesired; // RD
boolean recursionAvail; // RA
int rcode; // RCODE: 4-bit response code
int numQuestions;
int numAnswers;
int numAuthorities;
int numAdditionals;
/*
* Returns a representation of a decoded DNS message header.
* Does not modify or store a reference to the msg array.
*/
Header(byte[] msg, int msgLen) throws NamingException {
decode(msg, msgLen);
}
/*
* Decodes a DNS message header. Does not modify or store a
* reference to the msg array.
*/
private void decode(byte[] msg, int msgLen) throws NamingException {
try {
int pos = 0; // current offset into msg
if (msgLen < HEADER_SIZE) {
throw new CommunicationException(
"DNS error: corrupted message header");
}
xid = getShort(msg, pos);
pos += 2;
// Flags
short flags = (short) getShort(msg, pos);
pos += 2;
query = (flags & QR_BIT) == 0;
opcode = (flags & OPCODE_MASK) >>> OPCODE_SHIFT;
authoritative = (flags & AA_BIT) != 0;
truncated = (flags & TC_BIT) != 0;
recursionDesired = (flags & RD_BIT) != 0;
recursionAvail = (flags & RA_BIT) != 0;
rcode = (flags & RCODE_MASK);
// RR counts
numQuestions = getShort(msg, pos);
pos += 2;
numAnswers = getShort(msg, pos);
pos += 2;
numAuthorities = getShort(msg, pos);
pos += 2;
numAdditionals = getShort(msg, pos);
pos += 2;
} catch (IndexOutOfBoundsException e) {
throw new CommunicationException(
"DNS error: corrupted message header");
}
}
/*
* Returns the 2-byte unsigned value at msg[pos]. The high
* order byte comes first.
*/
private static int getShort(byte[] msg, int pos) {
return (((msg[pos] & 0xFF) << 8) |
(msg[pos + 1] & 0xFF));
}
}

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/*
* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.jndi.dns;
import java.util.Hashtable;
/**
* A NameNode represents a node in the DNS namespace. Each node
* has a label, which is its name relative to its parent (so the
* node at Sun.COM has label "Sun"). Each node has a hashtable of
* children indexed by their labels converted to lower-case.
*
* <p> A node may be addressed from another by giving a DnsName
* consisting of the sequence of labels from one node to the other.
*
* <p> Each node also has an {@code isZoneCut} flag, used to indicate
* if the node is a zone cut. A zone cut is a node with an NS record
* that is contained in one zone, but that actually belongs to a child zone.
*
* <p> All access is unsynchronized.
*
* @author Scott Seligman
*/
class NameNode {
private String label; // name of this node relative to its
// parent, or null for root of a tree
private Hashtable<String,NameNode> children = null; // child nodes
private boolean isZoneCut = false; // true if this node is a zone cut
private int depth = 0; // depth in tree (0 for root)
NameNode(String label) {
this.label = label;
}
/*
* Returns a newly-allocated NameNode. Used to allocate new nodes
* in a tree. Should be overridden in a subclass to return an object
* of the subclass's type.
*/
protected NameNode newNameNode(String label) {
return new NameNode(label);
}
/*
* Returns the name of this node relative to its parent, or null for
* the root of a tree.
*/
String getLabel() {
return label;
}
/*
* Returns the depth of this node in the tree. The depth of the root
* is 0.
*/
int depth() {
return depth;
}
boolean isZoneCut() {
return isZoneCut;
}
void setZoneCut(boolean isZoneCut) {
this.isZoneCut = isZoneCut;
}
/*
* Returns the children of this node, or null if there are none.
* The caller must not modify the Hashtable returned.
*/
Hashtable<String,NameNode> getChildren() {
return children;
}
/*
* Returns the child node given the hash key (the down-cased label)
* for its name relative to this node, or null if there is no such
* child.
*/
NameNode get(String key) {
return (children != null)
? children.get(key)
: null;
}
/*
* Returns the node at the end of a path, or null if the
* node does not exist.
* The path is specified by the labels of {@code name}, beginning
* at index idx.
*/
NameNode get(DnsName name, int idx) {
NameNode node = this;
for (int i = idx; i < name.size() && node != null; i++) {
node = node.get(name.getKey(i));
}
return node;
}
/*
* Returns the node at the end of a path, creating it and any
* intermediate nodes as needed.
* The path is specified by the labels of {@code name}, beginning
* at index idx.
*/
NameNode add(DnsName name, int idx) {
NameNode node = this;
for (int i = idx; i < name.size(); i++) {
String label = name.get(i);
String key = name.getKey(i);
NameNode child = null;
if (node.children == null) {
node.children = new Hashtable<>();
} else {
child = node.children.get(key);
}
if (child == null) {
child = newNameNode(label);
child.depth = node.depth + 1;
node.children.put(key, child);
}
node = child;
}
return node;
}
}

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/*
* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.jndi.dns;
import javax.naming.*;
/**
* The Resolver class performs DNS client operations in support of DnsContext.
*
* <p> Every DnsName instance passed to or returned from a method of
* this class should be fully-qualified and contain a root label (an
* empty component at position 0).
*
* @author Scott Seligman
*/
class Resolver {
private DnsClient dnsClient;
private int timeout; // initial timeout on UDP queries in ms
private int retries; // number of UDP retries
/*
* Constructs a new Resolver given its servers and timeout parameters.
* Each server is of the form "server[:port]".
* IPv6 literal host names include delimiting brackets.
* There must be at least one server.
* "timeout" is the initial timeout interval (in ms) for UDP queries,
* and "retries" gives the number of retries per server.
*/
Resolver(String[] servers, int timeout, int retries)
throws NamingException {
this.timeout = timeout;
this.retries = retries;
dnsClient = new DnsClient(servers, timeout, retries);
}
public void close() {
dnsClient.close();
dnsClient = null;
}
/*
* Queries resource records of a particular class and type for a
* given domain name.
* Useful values of rrclass are ResourceRecord.[Q]CLASS_xxx.
* Useful values of rrtype are ResourceRecord.[Q]TYPE_xxx.
* If recursion is true, recursion is requested on the query.
* If auth is true, only authoritative responses are accepted.
*/
ResourceRecords query(DnsName fqdn, int rrclass, int rrtype,
boolean recursion, boolean auth)
throws NamingException {
return dnsClient.query(fqdn, rrclass, rrtype, recursion, auth);
}
/*
* Queries all resource records of a zone given its domain name and class.
* If recursion is true, recursion is requested on the query to find
* the name server (and also on the zone transfer, but it won't matter).
*/
ResourceRecords queryZone(DnsName zone, int rrclass, boolean recursion)
throws NamingException {
DnsClient cl =
new DnsClient(findNameServers(zone, recursion), timeout, retries);
try {
return cl.queryZone(zone, rrclass, recursion);
} finally {
cl.close();
}
}
/*
* Finds the zone of a given domain name. The method is to look
* for the first SOA record on the path from the given domain to
* the root. This search may be partially bypassed if the zone's
* SOA record is received in the authority section of a response.
* If recursion is true, recursion is requested on any queries.
*/
DnsName findZoneName(DnsName fqdn, int rrclass, boolean recursion)
throws NamingException {
fqdn = (DnsName) fqdn.clone();
while (fqdn.size() > 1) { // while below root
ResourceRecords rrs = null;
try {
rrs = query(fqdn, rrclass, ResourceRecord.TYPE_SOA,
recursion, false);
} catch (NameNotFoundException e) {
throw e;
} catch (NamingException e) {
// Ignore error and keep searching up the tree.
}
if (rrs != null) {
if (rrs.answer.size() > 0) { // found zone's SOA
return fqdn;
}
// Look for an SOA record giving the zone's top node.
for (int i = 0; i < rrs.authority.size(); i++) {
ResourceRecord rr = rrs.authority.elementAt(i);
if (rr.getType() == ResourceRecord.TYPE_SOA) {
DnsName zone = rr.getName();
if (fqdn.endsWith(zone)) {
return zone;
}
}
}
}
fqdn.remove(fqdn.size() - 1); // one step rootward
}
return fqdn; // no SOA found below root, so
// return root
}
/*
* Finds a zone's SOA record. Returns null if no SOA is found (in
* which case "zone" is not actually a zone).
* If recursion is true, recursion is requested on the query.
*/
ResourceRecord findSoa(DnsName zone, int rrclass, boolean recursion)
throws NamingException {
ResourceRecords rrs = query(zone, rrclass, ResourceRecord.TYPE_SOA,
recursion, false);
for (int i = 0; i < rrs.answer.size(); i++) {
ResourceRecord rr = rrs.answer.elementAt(i);
if (rr.getType() == ResourceRecord.TYPE_SOA) {
return rr;
}
}
return null;
}
/*
* Finds the name servers of a zone. {@code zone} is a fully-qualified
* domain name at the top of a zone.
* If recursion is true, recursion is requested on the query.
*/
private String[] findNameServers(DnsName zone, boolean recursion)
throws NamingException {
// %%% As an optimization, could look in authority section of
// findZoneName() response first.
ResourceRecords rrs =
query(zone, ResourceRecord.CLASS_INTERNET, ResourceRecord.TYPE_NS,
recursion, false);
String[] ns = new String[rrs.answer.size()];
for (int i = 0; i < ns.length; i++) {
ResourceRecord rr = rrs.answer.elementAt(i);
if (rr.getType() != ResourceRecord.TYPE_NS) {
throw new CommunicationException("Corrupted DNS message");
}
ns[i] = (String) rr.getRdata();
// Server name will be passed to InetAddress.getByName(), which
// may not be able to handle a trailing dot.
// assert ns[i].endsWith(".");
ns[i] = ns[i].substring(0, ns[i].length() - 1);
}
return ns;
}
}

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/*
* Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.jndi.dns;
import javax.naming.CommunicationException;
import javax.naming.InvalidNameException;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
/**
* The ResourceRecord class represents a DNS resource record.
* The string format is based on the master file representation in
* RFC 1035.
*
* @author Scott Seligman
*/
public class ResourceRecord {
/*
* Resource record type codes
*/
static final int TYPE_A = 1;
static final int TYPE_NS = 2;
static final int TYPE_CNAME = 5;
static final int TYPE_SOA = 6;
static final int TYPE_PTR = 12;
static final int TYPE_HINFO = 13;
static final int TYPE_MX = 15;
static final int TYPE_TXT = 16;
static final int TYPE_AAAA = 28;
static final int TYPE_SRV = 33;
static final int TYPE_NAPTR = 35;
static final int QTYPE_AXFR = 252; // zone transfer
static final int QTYPE_STAR = 255; // query type "*"
/*
* Mapping from resource record type codes to type name strings.
*/
static final String rrTypeNames[] = {
null, "A", "NS", null, null,
"CNAME", "SOA", null, null, null,
null, null, "PTR", "HINFO", null,
"MX", "TXT", null, null, null,
null, null, null, null, null,
null, null, null, "AAAA", null,
null, null, null, "SRV", null,
"NAPTR"
};
/*
* Resource record class codes
*/
static final int CLASS_INTERNET = 1;
static final int CLASS_HESIOD = 2;
static final int QCLASS_STAR = 255; // query class "*"
/*
* Mapping from resource record type codes to class name strings.
*/
static final String rrClassNames[] = {
null, "IN", null, null, "HS"
};
/*
* Maximum number of compression references in labels.
* Used to detect compression loops.
*/
private static final int MAXIMUM_COMPRESSION_REFERENCES = 16;
byte[] msg; // DNS message
int msgLen; // msg size (in octets)
boolean qSection; // true if this RR is part of question section
// and therefore has no ttl or rdata
int offset; // offset of RR w/in msg
int rrlen; // number of octets in encoded RR
DnsName name; // name field of RR, including root label
int rrtype; // type field of RR
String rrtypeName; // name of rrtype
int rrclass; // class field of RR
String rrclassName; // name of rrclass
int ttl = 0; // ttl field of RR
int rdlen = 0; // number of octets of rdata
Object rdata = null; // rdata -- most are String, unknown are byte[]
/*
* Constructs a new ResourceRecord. The encoded data of the DNS
* message is contained in msg; data for this RR begins at msg[offset].
* If qSection is true this RR is part of a question section. It's
* not a true resource record in that case, but is treated as if it
* were a shortened one (with no ttl or rdata). If decodeRdata is
* false, the rdata is not decoded (and getRdata() will return null)
* unless this is an SOA record.
*
* @throws CommunicationException if a decoded domain name isn't valid.
* @throws ArrayIndexOutOfBoundsException given certain other corrupt data.
*/
ResourceRecord(byte[] msg, int msgLen, int offset,
boolean qSection, boolean decodeRdata)
throws CommunicationException {
this.msg = msg;
this.msgLen = msgLen;
this.offset = offset;
this.qSection = qSection;
decode(decodeRdata);
}
public String toString() {
String text = name + " " + rrclassName + " " + rrtypeName;
if (!qSection) {
text += " " + ttl + " " +
((rdata != null) ? rdata : "[n/a]");
}
return text;
}
/*
* Returns the name field of this RR, including the root label.
*/
public DnsName getName() {
return name;
}
/*
* Returns the number of octets in the encoded RR.
*/
public int size() {
return rrlen;
}
public int getType() {
return rrtype;
}
public int getRrclass() {
return rrclass;
}
public Object getRdata() {
return rdata;
}
public static String getTypeName(int rrtype) {
return valueToName(rrtype, rrTypeNames);
}
public static int getType(String typeName) {
return nameToValue(typeName, rrTypeNames);
}
public static String getRrclassName(int rrclass) {
return valueToName(rrclass, rrClassNames);
}
public static int getRrclass(String className) {
return nameToValue(className, rrClassNames);
}
private static String valueToName(int val, String[] names) {
String name = null;
if ((val > 0) && (val < names.length)) {
name = names[val];
} else if (val == QTYPE_STAR) { // QTYPE_STAR == QCLASS_STAR
name = "*";
}
if (name == null) {
name = Integer.toString(val);
}
return name;
}
private static int nameToValue(String name, String[] names) {
if (name.equals("")) {
return -1; // invalid name
} else if (name.equals("*")) {
return QTYPE_STAR; // QTYPE_STAR == QCLASS_STAR
}
if (Character.isDigit(name.charAt(0))) {
try {
return Integer.parseInt(name);
} catch (NumberFormatException e) {
}
}
for (int i = 1; i < names.length; i++) {
if ((names[i] != null) &&
name.equalsIgnoreCase(names[i])) {
return i;
}
}
return -1; // unknown name
}
/*
* Compares two SOA record serial numbers using 32-bit serial number
* arithmetic as defined in RFC 1982. Serial numbers are unsigned
* 32-bit quantities. Returns a negative, zero, or positive value
* as the first serial number is less than, equal to, or greater
* than the second. If the serial numbers are not comparable the
* result is undefined. Note that the relation is not transitive.
*/
public static int compareSerialNumbers(long s1, long s2) {
long diff = s2 - s1;
if (diff == 0) {
return 0;
} else if ((diff > 0 && diff <= 0x7FFFFFFF) ||
(diff < 0 && -diff > 0x7FFFFFFF)) {
return -1;
} else {
return 1;
}
}
/*
* Decodes the binary format of the RR.
* May throw ArrayIndexOutOfBoundsException given corrupt data.
*/
private void decode(boolean decodeRdata) throws CommunicationException {
int pos = offset; // index of next unread octet
name = new DnsName(); // NAME
pos = decodeName(pos, name);
rrtype = getUShort(pos); // TYPE
rrtypeName = (rrtype < rrTypeNames.length)
? rrTypeNames[rrtype]
: null;
if (rrtypeName == null) {
rrtypeName = Integer.toString(rrtype);
}
pos += 2;
rrclass = getUShort(pos); // CLASS
rrclassName = (rrclass < rrClassNames.length)
? rrClassNames[rrclass]
: null;
if (rrclassName == null) {
rrclassName = Integer.toString(rrclass);
}
pos += 2;
if (!qSection) {
ttl = getInt(pos); // TTL
pos += 4;
rdlen = getUShort(pos); // RDLENGTH
pos += 2;
rdata = (decodeRdata || // RDATA
(rrtype == TYPE_SOA))
? decodeRdata(pos)
: null;
if (rdata instanceof DnsName) {
rdata = rdata.toString();
}
pos += rdlen;
}
rrlen = pos - offset;
msg = null; // free up for GC
}
/*
* Returns the 1-byte unsigned value at msg[pos].
*/
private int getUByte(int pos) {
return (msg[pos] & 0xFF);
}
/*
* Returns the 2-byte unsigned value at msg[pos]. The high
* order byte comes first.
*/
private int getUShort(int pos) {
return (((msg[pos] & 0xFF) << 8) |
(msg[pos + 1] & 0xFF));
}
/*
* Returns the 4-byte signed value at msg[pos]. The high
* order byte comes first.
*/
private int getInt(int pos) {
return ((getUShort(pos) << 16) | getUShort(pos + 2));
}
/*
* Returns the 4-byte unsigned value at msg[pos]. The high
* order byte comes first.
*/
private long getUInt(int pos) {
return (getInt(pos) & 0xffffffffL);
}
/*
* Returns the name encoded at msg[pos], including the root label.
*/
private DnsName decodeName(int pos) throws CommunicationException {
DnsName n = new DnsName();
decodeName(pos, n);
return n;
}
/*
* Prepends to "n" the domain name encoded at msg[pos], including the root
* label. Returns the index into "msg" following the name.
*/
private int decodeName(int pos, DnsName n) throws CommunicationException {
int endPos = -1;
int level = 0;
try {
while (true) {
if (level > MAXIMUM_COMPRESSION_REFERENCES)
throw new IOException("Too many compression references");
int typeAndLen = msg[pos] & 0xFF;
if (typeAndLen == 0) { // end of name
++pos;
n.add(0, "");
break;
} else if (typeAndLen <= 63) { // regular label
++pos;
n.add(0, new String(msg, pos, typeAndLen,
StandardCharsets.ISO_8859_1));
pos += typeAndLen;
} else if ((typeAndLen & 0xC0) == 0xC0) { // name compression
++level;
endPos = pos + 2;
pos = getUShort(pos) & 0x3FFF;
} else
throw new IOException("Invalid label type: " + typeAndLen);
}
} catch (IOException | InvalidNameException e) {
CommunicationException ce =new CommunicationException(
"DNS error: malformed packet");
ce.initCause(e);
throw ce;
}
if (endPos == -1)
endPos = pos;
return endPos;
}
/*
* Returns the rdata encoded at msg[pos]. The format is dependent
* on the rrtype and rrclass values, which have already been set.
* The length of the encoded data is rdlen, which has already been
* set.
* The rdata of records with unknown type/class combinations is
* returned in a newly-allocated byte array.
*/
private Object decodeRdata(int pos) throws CommunicationException {
if (rrclass == CLASS_INTERNET) {
switch (rrtype) {
case TYPE_A:
return decodeA(pos);
case TYPE_AAAA:
return decodeAAAA(pos);
case TYPE_CNAME:
case TYPE_NS:
case TYPE_PTR:
return decodeName(pos);
case TYPE_MX:
return decodeMx(pos);
case TYPE_SOA:
return decodeSoa(pos);
case TYPE_SRV:
return decodeSrv(pos);
case TYPE_NAPTR:
return decodeNaptr(pos);
case TYPE_TXT:
return decodeTxt(pos);
case TYPE_HINFO:
return decodeHinfo(pos);
}
}
// Unknown RR type/class
byte[] rd = new byte[rdlen];
System.arraycopy(msg, pos, rd, 0, rdlen);
return rd;
}
/*
* Returns the rdata of an MX record that is encoded at msg[pos].
*/
private String decodeMx(int pos) throws CommunicationException {
int preference = getUShort(pos);
pos += 2;
DnsName name = decodeName(pos);
return (preference + " " + name);
}
/*
* Returns the rdata of an SOA record that is encoded at msg[pos].
*/
private String decodeSoa(int pos) throws CommunicationException {
DnsName mname = new DnsName();
pos = decodeName(pos, mname);
DnsName rname = new DnsName();
pos = decodeName(pos, rname);
long serial = getUInt(pos);
pos += 4;
long refresh = getUInt(pos);
pos += 4;
long retry = getUInt(pos);
pos += 4;
long expire = getUInt(pos);
pos += 4;
long minimum = getUInt(pos); // now used as negative TTL
pos += 4;
return (mname + " " + rname + " " + serial + " " +
refresh + " " + retry + " " + expire + " " + minimum);
}
/*
* Returns the rdata of an SRV record that is encoded at msg[pos].
* See RFC 2782.
*/
private String decodeSrv(int pos) throws CommunicationException {
int priority = getUShort(pos);
pos += 2;
int weight = getUShort(pos);
pos += 2;
int port = getUShort(pos);
pos += 2;
DnsName target = decodeName(pos);
return (priority + " " + weight + " " + port + " " + target);
}
/*
* Returns the rdata of an NAPTR record that is encoded at msg[pos].
* See RFC 2915.
*/
private String decodeNaptr(int pos) throws CommunicationException {
int order = getUShort(pos);
pos += 2;
int preference = getUShort(pos);
pos += 2;
StringBuffer flags = new StringBuffer();
pos += decodeCharString(pos, flags);
StringBuffer services = new StringBuffer();
pos += decodeCharString(pos, services);
StringBuffer regexp = new StringBuffer(rdlen);
pos += decodeCharString(pos, regexp);
DnsName replacement = decodeName(pos);
return (order + " " + preference + " " + flags + " " +
services + " " + regexp + " " + replacement);
}
/*
* Returns the rdata of a TXT record that is encoded at msg[pos].
* The rdata consists of one or more <character-string>s.
*/
private String decodeTxt(int pos) {
StringBuffer buf = new StringBuffer(rdlen);
int end = pos + rdlen;
while (pos < end) {
pos += decodeCharString(pos, buf);
if (pos < end) {
buf.append(' ');
}
}
return buf.toString();
}
/*
* Returns the rdata of an HINFO record that is encoded at msg[pos].
* The rdata consists of two <character-string>s.
*/
private String decodeHinfo(int pos) {
StringBuffer buf = new StringBuffer(rdlen);
pos += decodeCharString(pos, buf);
buf.append(' ');
pos += decodeCharString(pos, buf);
return buf.toString();
}
/*
* Decodes the <character-string> at msg[pos] and adds it to buf.
* If the string contains one of the meta-characters ' ', '\\', or
* '"', then the result is quoted and any embedded '\\' or '"'
* chars are escaped with '\\'. Empty strings are also quoted.
* Returns the size of the encoded string, including the initial
* length octet.
*/
private int decodeCharString(int pos, StringBuffer buf) {
int start = buf.length(); // starting index of this string
int len = getUByte(pos++); // encoded string length
boolean quoted = (len == 0); // quote string if empty
for (int i = 0; i < len; i++) {
int c = getUByte(pos++);
quoted |= (c == ' ');
if ((c == '\\') || (c == '"')) {
quoted = true;
buf.append('\\');
}
buf.append((char) c);
}
if (quoted) {
buf.insert(start, '"');
buf.append('"');
}
return (len + 1); // size includes initial octet
}
/*
* Returns the rdata of an A record, in dotted-decimal format,
* that is encoded at msg[pos].
*/
private String decodeA(int pos) {
return ((msg[pos] & 0xff) + "." +
(msg[pos + 1] & 0xff) + "." +
(msg[pos + 2] & 0xff) + "." +
(msg[pos + 3] & 0xff));
}
/*
* Returns the rdata of an AAAA record, in colon-separated format,
* that is encoded at msg[pos]. For example: 4321:0:1:2:3:4:567:89ab.
* See RFCs 1886 and 2373.
*/
private String decodeAAAA(int pos) {
int[] addr6 = new int[8]; // the unsigned 16-bit words of the address
for (int i = 0; i < 8; i++) {
addr6[i] = getUShort(pos);
pos += 2;
}
// Find longest sequence of two or more zeros, to compress them.
int curBase = -1;
int curLen = 0;
int bestBase = -1;
int bestLen = 0;
for (int i = 0; i < 8; i++) {
if (addr6[i] == 0) {
if (curBase == -1) { // new sequence
curBase = i;
curLen = 1;
} else { // extend sequence
++curLen;
if ((curLen >= 2) && (curLen > bestLen)) {
bestBase = curBase;
bestLen = curLen;
}
}
} else { // not in sequence
curBase = -1;
}
}
// If addr begins with at least 6 zeros and is not :: or ::1,
// or with 5 zeros followed by 0xffff, use the text format for
// IPv4-compatible or IPv4-mapped addresses.
if (bestBase == 0) {
if ((bestLen == 6) ||
((bestLen == 7) && (addr6[7] > 1))) {
return ("::" + decodeA(pos - 4));
} else if ((bestLen == 5) && (addr6[5] == 0xffff)) {
return ("::ffff:" + decodeA(pos - 4));
}
}
// If bestBase != -1, compress zeros in [bestBase, bestBase+bestLen)
boolean compress = (bestBase != -1);
StringBuilder sb = new StringBuilder(40);
if (bestBase == 0) {
sb.append(':');
}
for (int i = 0; i < 8; i++) {
if (!compress || (i < bestBase) || (i >= bestBase + bestLen)) {
sb.append(Integer.toHexString(addr6[i]));
if (i < 7) {
sb.append(':');
}
} else if (compress && (i == bestBase)) { // first compressed zero
sb.append(':');
}
}
return sb.toString();
}
}

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/*
* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.jndi.dns;
import java.util.Vector;
import javax.naming.*;
/**
* The ResourceRecords class represents the resource records in the
* four sections of a DNS message.
*
* The additional records section is currently ignored.
*
* @author Scott Seligman
*/
class ResourceRecords {
// Four sections: question, answer, authority, additional.
// The question section is treated as being made up of (shortened)
// resource records, although this isn't technically how it's defined.
Vector<ResourceRecord> question = new Vector<>();
Vector<ResourceRecord> answer = new Vector<>();
Vector<ResourceRecord> authority = new Vector<>();
Vector<ResourceRecord> additional = new Vector<>();
/*
* True if these resource records are from a zone transfer. In
* that case only answer records are read (as per
* draft-ietf-dnsext-axfr-clarify-02.txt). Also, the rdata of
* those answer records is not decoded (for efficiency) except
* for SOA records.
*/
boolean zoneXfer;
/*
* Returns a representation of the resource records in a DNS message.
* Does not modify or store a reference to the msg array.
*/
ResourceRecords(byte[] msg, int msgLen, Header hdr, boolean zoneXfer)
throws NamingException {
if (zoneXfer) {
answer.ensureCapacity(8192); // an arbitrary "large" number
}
this.zoneXfer = zoneXfer;
add(msg, msgLen, hdr);
}
/*
* Returns the type field of the first answer record, or -1 if
* there are no answer records.
*/
int getFirstAnsType() {
if (answer.size() == 0) {
return -1;
}
return answer.firstElement().getType();
}
/*
* Returns the type field of the last answer record, or -1 if
* there are no answer records.
*/
int getLastAnsType() {
if (answer.size() == 0) {
return -1;
}
return answer.lastElement().getType();
}
/*
* Decodes the resource records in a DNS message and adds
* them to this object.
* Does not modify or store a reference to the msg array.
*/
void add(byte[] msg, int msgLen, Header hdr) throws NamingException {
ResourceRecord rr;
int pos = Header.HEADER_SIZE; // current offset into msg
try {
for (int i = 0; i < hdr.numQuestions; i++) {
rr = new ResourceRecord(msg, msgLen, pos, true, false);
if (!zoneXfer) {
question.addElement(rr);
}
pos += rr.size();
}
for (int i = 0; i < hdr.numAnswers; i++) {
rr = new ResourceRecord(
msg, msgLen, pos, false, !zoneXfer);
answer.addElement(rr);
pos += rr.size();
}
if (zoneXfer) {
return;
}
for (int i = 0; i < hdr.numAuthorities; i++) {
rr = new ResourceRecord(msg, msgLen, pos, false, true);
authority.addElement(rr);
pos += rr.size();
}
// The additional records section is currently ignored.
} catch (IndexOutOfBoundsException e) {
throw new CommunicationException(
"DNS error: corrupted message");
}
}
}

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/*
* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.jndi.dns;
import java.lang.ref.SoftReference;
import java.util.Date;
import java.util.Vector;
/**
* ZoneNode extends NameNode to represent a tree of the zones in the
* DNS namespace, along with any intermediate nodes between zones.
* A ZoneNode that represents a zone may be "populated" with a
* NameNode tree containing the zone's contents.
*
* <p> A populated zone's contents will be flagged as having expired after
* the time specified by the minimum TTL value in the zone's SOA record.
*
* <p> Since zone cuts aren't directly modeled by a tree of ZoneNodes,
* ZoneNode.isZoneCut() always returns false.
*
* <p> The synchronization strategy is documented in DnsContext.java.
*
* <p> The zone's contents are accessed via a soft reference, so its
* heap space may be reclaimed when necessary. The zone may be
* repopulated later.
*
* @author Scott Seligman
*/
class ZoneNode extends NameNode {
private SoftReference<NameNode> contentsRef = null; // the zone's namespace
private long serialNumber = -1; // the zone data's serial number
private Date expiration = null; // time when the zone's data expires
ZoneNode(String label) {
super(label);
}
protected NameNode newNameNode(String label) {
return new ZoneNode(label);
}
/*
* Clears the contents of this node. If the node was flagged as
* expired, it remains so.
*/
synchronized void depopulate() {
contentsRef = null;
serialNumber = -1;
}
/*
* Is this node currently populated?
*/
synchronized boolean isPopulated() {
return (getContents() != null);
}
/*
* Returns the zone's contents, or null if the zone is not populated.
*/
synchronized NameNode getContents() {
return (contentsRef != null)
? contentsRef.get()
: null;
}
/*
* Has this zone's data expired?
*/
synchronized boolean isExpired() {
return ((expiration != null) && expiration.before(new Date()));
}
/*
* Returns the deepest populated zone on the path specified by a
* fully-qualified domain name, or null if there is no populated
* zone on that path. Note that a node may be depopulated after
* being returned.
*/
ZoneNode getDeepestPopulated(DnsName fqdn) {
ZoneNode znode = this;
ZoneNode popNode = isPopulated() ? this : null;
for (int i = 1; i < fqdn.size(); i++) { // "i=1" to skip root label
znode = (ZoneNode) znode.get(fqdn.getKey(i));
if (znode == null) {
break;
} else if (znode.isPopulated()) {
popNode = znode;
}
}
return popNode;
}
/*
* Populates (or repopulates) a zone given its own fully-qualified
* name and its resource records. Returns the zone's new contents.
*/
NameNode populate(DnsName zone, ResourceRecords rrs) {
// assert zone.get(0).equals(""); // zone has root label
// assert (zone.size() == (depth() + 1)); // +1 due to root label
NameNode newContents = new NameNode(null);
for (int i = 0; i < rrs.answer.size(); i++) {
ResourceRecord rr = rrs.answer.elementAt(i);
DnsName n = rr.getName();
// Ignore resource records whose names aren't within the zone's
// domain. Also skip records of the zone's top node, since
// the zone's root NameNode is already in place.
if ((n.size() > zone.size()) && n.startsWith(zone)) {
NameNode nnode = newContents.add(n, zone.size());
if (rr.getType() == ResourceRecord.TYPE_NS) {
nnode.setZoneCut(true);
}
}
}
// The zone's SOA record is the first record in the answer section.
ResourceRecord soa = rrs.answer.firstElement();
synchronized (this) {
contentsRef = new SoftReference<NameNode>(newContents);
serialNumber = getSerialNumber(soa);
setExpiration(getMinimumTtl(soa));
return newContents;
}
}
/*
* Set this zone's data to expire in {@code secsToExpiration} seconds.
*/
private void setExpiration(long secsToExpiration) {
expiration = new Date(System.currentTimeMillis() +
1000 * secsToExpiration);
}
/*
* Returns an SOA record's minimum TTL field.
*/
private static long getMinimumTtl(ResourceRecord soa) {
String rdata = (String) soa.getRdata();
int pos = rdata.lastIndexOf(' ') + 1;
return Long.parseLong(rdata.substring(pos));
}
/*
* Compares this zone's serial number with that of an SOA record.
* Zone must be populated.
* Returns a negative, zero, or positive integer as this zone's
* serial number is less than, equal to, or greater than the SOA
* record's.
* See ResourceRecord.compareSerialNumbers() for a description of
* serial number arithmetic.
*/
int compareSerialNumberTo(ResourceRecord soa) {
// assert isPopulated();
return ResourceRecord.compareSerialNumbers(serialNumber,
getSerialNumber(soa));
}
/*
* Returns an SOA record's serial number.
*/
private static long getSerialNumber(ResourceRecord soa) {
String rdata = (String) soa.getRdata();
// An SOA record ends with: serial refresh retry expire minimum.
// Set "beg" to the space before serial, and "end" to the space after.
// We go "backward" to avoid dealing with escaped spaces in names.
int beg = rdata.length();
int end = -1;
for (int i = 0; i < 5; i++) {
end = beg;
beg = rdata.lastIndexOf(' ', end - 1);
}
return Long.parseLong(rdata.substring(beg + 1, end));
}
}

74
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/*
* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.jndi.url.dns;
import java.net.MalformedURLException;
import java.util.Hashtable;
import javax.naming.*;
import javax.naming.spi.ResolveResult;
import com.sun.jndi.dns.*;
import com.sun.jndi.toolkit.url.GenericURLDirContext;
/**
* A DNS URL context resolves names that are DNS pseudo-URLs.
* See com.sun.jndi.dns.DnsUrl for a description of the URL format.
*
* @author Scott Seligman
*/
public class dnsURLContext extends GenericURLDirContext {
public dnsURLContext(Hashtable<?,?> env) {
super(env);
}
/**
* Resolves the host and port of "url" to a root context connected
* to the named DNS server, and returns the domain name as the
* remaining name.
*/
protected ResolveResult getRootURLContext(String url, Hashtable<?,?> env)
throws NamingException {
DnsUrl dnsUrl;
try {
dnsUrl = new DnsUrl(url);
} catch (MalformedURLException e) {
throw new InvalidNameException(e.getMessage());
}
DnsUrl[] urls = new DnsUrl[] { dnsUrl };
String domain = dnsUrl.getDomain();
return new ResolveResult(
DnsContextFactory.getContext(".", urls, env),
new CompositeName().add(domain));
}
}

103
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/*
* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.jndi.url.dns;
import java.util.Hashtable;
import javax.naming.*;
import javax.naming.spi.ObjectFactory;
/**
* A DNS URL context factory creates contexts that can resolve names
* that are DNS pseudo-URLs.
* In addition, if given a specific DNS URL (or an array of them), the
* factory will resolve all the way to the named context.
* See com.sun.jndi.dns.DnsUrl for a description of the URL format.
*
* @author Scott Seligman
*/
public class dnsURLContextFactory implements ObjectFactory {
public Object getObjectInstance(Object urlInfo, Name name,
Context nameCtx, Hashtable<?,?> env)
throws NamingException {
if (urlInfo == null) {
return (new dnsURLContext(env));
} else if (urlInfo instanceof String) {
return getUsingURL((String) urlInfo, env);
} else if (urlInfo instanceof String[]) {
return getUsingURLs((String[]) urlInfo, env);
} else {
throw (new ConfigurationException(
"dnsURLContextFactory.getObjectInstance: " +
"argument must be a DNS URL String or an array of them"));
}
}
private static Object getUsingURL(String url, Hashtable<?,?> env)
throws NamingException {
dnsURLContext urlCtx = new dnsURLContext(env);
try {
return urlCtx.lookup(url);
} finally {
urlCtx.close();
}
}
/*
* Try each URL until lookup() succeeds for one of them.
* If all URLs fail, throw one of the exceptions arbitrarily.
* Not pretty, but potentially more informative than returning null.
*/
private static Object getUsingURLs(String[] urls, Hashtable<?,?> env)
throws NamingException {
if (urls.length == 0) {
throw (new ConfigurationException(
"dnsURLContextFactory: empty URL array"));
}
dnsURLContext urlCtx = new dnsURLContext(env);
try {
NamingException ne = null;
for (int i = 0; i < urls.length; i++) {
try {
return urlCtx.lookup(urls[i]);
} catch (NamingException e) {
ne = e;
}
}
throw ne; // failure: throw one of the exceptions caught
} finally {
urlCtx.close();
}
}
}

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/*
* Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* Provides the implementation of the DNS Java Naming provider.
*
* @provides javax.naming.spi.InitialContextFactory
* @moduleGraph
* @since 9
*/
module jdk.naming.dns {
requires java.naming;
// temporary export until NamingManager.getURLContext uses services
exports com.sun.jndi.url.dns to java.naming;
provides javax.naming.spi.InitialContextFactory with
com.sun.jndi.dns.DnsContextFactory;
}