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
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
//
// Mono.Net.Dns.DnsResponse
//
// Authors:
// Gonzalo Paniagua Javier (gonzalo.mono@gmail.com)
//
// Copyright 2011 Gonzalo Paniagua Javier
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.Text;
namespace Mono.Net.Dns {
class DnsResponse : DnsPacket {
static readonly ReadOnlyCollection<DnsResourceRecord> EmptyRR = new ReadOnlyCollection<DnsResourceRecord> (new DnsResourceRecord [0]);
static readonly ReadOnlyCollection<DnsQuestion> EmptyQS = new ReadOnlyCollection<DnsQuestion> (new DnsQuestion [0]);
ReadOnlyCollection<DnsQuestion> question;
ReadOnlyCollection<DnsResourceRecord> answer;
ReadOnlyCollection<DnsResourceRecord> authority;
ReadOnlyCollection<DnsResourceRecord> additional;
int offset = DnsHeader.DnsHeaderLength;
public DnsResponse (byte [] buffer, int length)
: base (buffer, length)
{
}
public void Reset ()
{
question = null;
answer = null;
authority = null;
additional = null;
for (int i = 0; i < packet.Length; i++)
packet [i] = 0;
}
ReadOnlyCollection<DnsResourceRecord> GetRRs (int count)
{
if (count <= 0)
return EmptyRR;
List<DnsResourceRecord> records = new List<DnsResourceRecord>(count);
for (int i = 0; i < count; i++)
records.Add (DnsResourceRecord.CreateFromBuffer (this, position, ref offset));
return records.AsReadOnly ();
}
ReadOnlyCollection<DnsQuestion> GetQuestions (int count)
{
if (count <= 0)
return EmptyQS;
List<DnsQuestion> records = new List<DnsQuestion> (count);
for(int i = 0; i < count; i++) {
DnsQuestion record = new DnsQuestion ();
offset = record.Init (this, offset);
records.Add (record);
}
return records.AsReadOnly ();
}
public ReadOnlyCollection<DnsQuestion> GetQuestions ()
{
if (question == null)
question = GetQuestions (Header.QuestionCount);
return question;
}
public ReadOnlyCollection<DnsResourceRecord> GetAnswers ()
{
if (answer == null) {
GetQuestions ();
answer = GetRRs (Header.AnswerCount);
}
return answer;
}
public ReadOnlyCollection<DnsResourceRecord> GetAuthority ()
{
if (authority == null) {
GetQuestions ();
GetAnswers ();
authority = GetRRs (Header.AuthorityCount);
}
return authority;
}
public ReadOnlyCollection<DnsResourceRecord> GetAdditional ()
{
if (additional == null) {
GetQuestions ();
GetAnswers ();
GetAuthority ();
additional = GetRRs (Header.AdditionalCount);
}
return additional;
}
public override string ToString ()
{
StringBuilder sb = new StringBuilder();
sb.Append(Header);
sb.Append("Question:\r\n");
foreach(DnsQuestion q in GetQuestions()) {
sb.AppendFormat("\t{0}\r\n", q);
}
sb.Append("Answer(s):\r\n");
foreach(DnsResourceRecord q in GetAnswers()) {
sb.AppendFormat("\t{0}\r\n", q);
}
sb.Append("Authority:\r\n");
foreach(DnsResourceRecord q in GetAuthority()) {
sb.AppendFormat("\t{0}\r\n", q);
}
sb.Append("Additional:\r\n");
foreach(DnsResourceRecord q in GetAdditional()) {
sb.AppendFormat("\t{0}\r\n", q);
}
return sb.ToString();
}
}
}
|
