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
|
/*
* Copyright (c) 2008-2024 OARC, Inc.
* Copyright (c) 2007-2008, Internet Systems Consortium, Inc.
* Copyright (c) 2003-2007, The Measurement Factory, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "dns_source_port_index.h"
#include <string.h>
/* dns_source_port_indexer */
/* Indexes the source port of DNS messages */
static unsigned int f_index[65536];
static unsigned short r_index[65536];
static unsigned int largest = 0;
int dns_source_port_indexer(const dns_message* m)
{
unsigned short p = m->tm->src_port;
if (0 == f_index[p]) {
f_index[p] = ++largest;
r_index[largest] = p;
}
return f_index[p];
}
static int next_iter = 0;
int dns_source_port_iterator(const char** label)
{
static char label_buf[20];
if (NULL == label) {
next_iter = 0;
return largest + 1;
}
if (next_iter > largest)
return -1;
snprintf(label_buf, sizeof(label_buf), "%hu", r_index[next_iter++]);
*label = label_buf;
return next_iter;
}
void dns_source_port_reset(void)
{
memset(f_index, 0, sizeof f_index);
memset(r_index, 0, sizeof r_index);
largest = 0;
}
/* dns_sport_range_indexer */
/* Indexes the "range" of a TCP/UDP source port of DNS messages */
/* "Range" is defined as port/1024. */
static int range_largest = 0;
static int range_next_iter = 0;
int dns_sport_range_indexer(const dns_message* m)
{
int r = (int)m->tm->src_port >> 10;
if (r > range_largest)
range_largest = r;
return r;
}
int dns_sport_range_iterator(const char** label)
{
static char label_buf[20];
if (NULL == label) {
range_next_iter = 0;
return range_largest + 1;
}
if (range_next_iter > range_largest)
return -1;
snprintf(label_buf, sizeof(label_buf), "%d-%d", (range_next_iter << 10), ((range_next_iter + 1) << 10) - 1);
*label = label_buf;
return ++range_next_iter;
}
void dns_sport_range_reset(void)
{
range_largest = 0;
}
|
