blob: c42ac3ebe1e004a34336cf4089f9ae8e3e2f30c1 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
package de.measite.minidns.util;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.IDN;
import java.util.HashSet;
public class NameUtil {
public static int size(String name) {
return name.length() + 2;
}
public static byte[] toByteArray(String name) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream(64);
DataOutputStream dos = new DataOutputStream(baos);
for (String s: name.split("[.\u3002\uFF0E\uFF61]")) {
byte[] buffer = IDN.toASCII(s).getBytes();
dos.writeByte(buffer.length);
dos.write(buffer);
}
dos.writeByte(0);
dos.flush();
return baos.toByteArray();
}
public static String parse(DataInputStream dis, byte data[])
throws IOException
{
int c = dis.readUnsignedByte();
if ((c & 0xc0) == 0xc0) {
c = ((c & 0x3f) << 8) + dis.readUnsignedByte();
HashSet<Integer> jumps = new HashSet<Integer>();
jumps.add(c);
return parse(data, c, jumps);
}
if (c == 0) {
return "";
}
byte b[] = new byte[c];
dis.readFully(b);
String s = IDN.toUnicode(new String(b));
String t = parse(dis, data);
if (t.length() > 0) {
s = s + "." + t;
}
return s;
}
public static String parse(
byte data[],
int offset,
HashSet<Integer> jumps
) {
int c = data[offset] & 0xff;
if ((c & 0xc0) == 0xc0) {
c = ((c & 0x3f) << 8) + data[offset + 1];
if (jumps.contains(c)) {
throw new IllegalStateException("Cyclic offsets detected.");
}
jumps.add(c);
return parse(data, c, jumps);
}
if (c == 0) {
return "";
}
String s = new String(data,offset + 1, c);
String t = parse(data, offset + 1 + c, jumps);
if (t.length() > 0) {
s = s + "." + t;
}
return s;
}
}
|
