blob: 964ce23f48a6d5efd2ce2f9e0be8338e71b380bf (
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
78
79
80
81
|
// Copyright (c) 1999-2004 Brian Wellington (bwelling@xbill.org)
package org.xbill.DNS;
/**
* Constants and functions relating to flags in the DNS header.
*
* @author Brian Wellington
*/
public final class Flags {
private static Mnemonic flags = new Mnemonic("DNS Header Flag",
Mnemonic.CASE_LOWER);
/** query/response */
public static final byte QR = 0;
/** authoritative answer */
public static final byte AA = 5;
/** truncated */
public static final byte TC = 6;
/** recursion desired */
public static final byte RD = 7;
/** recursion available */
public static final byte RA = 8;
/** authenticated data */
public static final byte AD = 10;
/** (security) checking disabled */
public static final byte CD = 11;
/** dnssec ok (extended) */
public static final int DO = ExtendedFlags.DO;
static {
flags.setMaximum(0xF);
flags.setPrefix("FLAG");
flags.setNumericAllowed(true);
flags.add(QR, "qr");
flags.add(AA, "aa");
flags.add(TC, "tc");
flags.add(RD, "rd");
flags.add(RA, "ra");
flags.add(AD, "ad");
flags.add(CD, "cd");
}
private
Flags() {}
/** Converts a numeric Flag into a String */
public static String
string(int i) {
return flags.getText(i);
}
/** Converts a String representation of an Flag into its numeric value */
public static int
value(String s) {
return flags.getValue(s);
}
/**
* Indicates if a bit in the flags field is a flag or not. If it's part of
* the rcode or opcode, it's not.
*/
public static boolean
isFlag(int index) {
flags.check(index);
if ((index >= 1 && index <= 4) || (index >= 12))
return false;
return true;
}
}
|
