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package com.koushikdutta.async.dns;
import com.koushikdutta.async.ByteBufferList;
import com.koushikdutta.async.http.Multimap;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.ArrayList;
/**
* Created by koush on 10/20/13.
*/
public class DnsResponse {
public ArrayList<InetAddress> addresses = new ArrayList<InetAddress>();
public ArrayList<String> names = new ArrayList<String>();
public Multimap txt = new Multimap();
public InetSocketAddress source;
private static String parseName(ByteBufferList bb, ByteBuffer backReference) {
bb.order(ByteOrder.BIG_ENDIAN);
String ret = "";
int len;
while (0 != (len = bb.get() & 0x00FF)) {
// compressed
if ((len & 0x00c0) == 0x00c0) {
int offset = ((len & ~0xFFFFFFc0) << 8) | (bb.get() & 0x00FF);
if (ret.length() > 0)
ret += ".";
ByteBufferList sub = new ByteBufferList();
ByteBuffer duplicate = backReference.duplicate();
duplicate.get(new byte[offset]);
sub.add(duplicate);
return ret + parseName(sub, backReference);
}
byte[] bytes = new byte[len];
bb.get(bytes);
if (ret.length() > 0)
ret += ".";
ret += new String(bytes);
}
return ret;
}
public static DnsResponse parse(ByteBufferList bb) {
ByteBuffer b = bb.getAll();
bb.add(b.duplicate());
// naive parsing...
bb.order(ByteOrder.BIG_ENDIAN);
// id
bb.getShort();
// flags
bb.getShort();
// number questions
int questions = bb.getShort();
// number answer rr
int answers = bb.getShort();
// number authority rr
int authorities = bb.getShort();
// number additional rr
int additionals = bb.getShort();
for (int i = 0; i < questions; i++) {
parseName(bb, b);
// type
bb.getShort();
// class
bb.getShort();
}
DnsResponse response = new DnsResponse();
for (int i = 0; i < answers; i++) {
String name = parseName(bb, b);
// type
int type = bb.getShort();
// class
int clazz = bb.getShort();
// ttl
int ttl = bb.getInt();
// length of address
int length = bb.getShort();
try {
if (type == 1) {
// data
byte[] data = new byte[length];
bb.get(data);
response.addresses.add(InetAddress.getByAddress(data));
}
else if (type == 0x000c) {
response.names.add(parseName(bb, b));
}
else if (type == 16) {
ByteBufferList txt = new ByteBufferList();
bb.get(txt, length);
response.parseTxt(txt);
}
else {
bb.get(new byte[length]);
}
}
catch (Exception e) {
// e.printStackTrace();
}
}
// authorities
for (int i = 0; i < authorities; i++) {
String name = parseName(bb, b);
// type
int type = bb.getShort();
// class
int clazz = bb.getShort();
// ttl
int ttl = bb.getInt();
// length of address
int length = bb.getShort();
try {
bb.get(new byte[length]);
}
catch (Exception e) {
// e.printStackTrace();
}
}
// additionals
for (int i = 0; i < additionals; i++) {
String name = parseName(bb, b);
// type
int type = bb.getShort();
// class
int clazz = bb.getShort();
// ttl
int ttl = bb.getInt();
// length of address
int length = bb.getShort();
try {
if (type == 16) {
ByteBufferList txt = new ByteBufferList();
bb.get(txt, length);
response.parseTxt(txt);
}
else {
bb.get(new byte[length]);
}
}
catch (Exception e) {
// e.printStackTrace();
}
}
return response;
}
void parseTxt(ByteBufferList bb) {
while (bb.hasRemaining()) {
int length = (int)bb.get() & 0x00FF;
byte [] bytes = new byte[length];
bb.get(bytes);
String string = new String(bytes);
String[] pair = string.split("=");
txt.add(pair[0], pair[1]);
}
}
@Override
public String toString() {
String ret = "addresses:\n";
for (InetAddress address: addresses)
ret += address.toString() + "\n";
ret += "names:\n";
for (String name: names)
ret += name + "\n";
return ret;
}
}
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