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
|
/* $Id: internal.c,v 1.9 2004/04/05 12:47:07 armin Exp $ */
/*
* Copyright (c) 2003,2004 Armin Wolfermann
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "dnsproxy.h"
struct internal {
unsigned int addr;
unsigned int mask;
struct internal *next;
};
static struct internal *internals = NULL;
int
add_internal(char *s)
{
char *p;
int mask;
struct in_addr addr;
struct internal *ipa;
if (s == NULL)
return 0;
if ((p = strchr(s, '/')) != NULL) {
mask = strtol(p+1, NULL, 10) % 32;
*p = '\0';
} else {
mask = 32;
}
if (inet_pton(AF_INET, s, &addr) != 1)
return 0;
if ((ipa = calloc(1, sizeof(struct internal))) == NULL)
fatal("calloc: %s", strerror(errno));
memcpy(&ipa->addr, &addr, 4);
ipa->mask = htonl(0xffffffff << (32 - mask));
ipa->addr &= ipa->mask;
ipa->next = internals;
internals = ipa;
DPRINTF(("add_internal %s/%d (%08x/%08x)\n", inet_ntoa(addr), mask,
ipa->addr, ipa->mask));
return 1;
}
int
is_internal(struct in_addr arg)
{
unsigned int addr;
struct internal *p;
DPRINTF(("is_internal(%s)\n", inet_ntoa(arg)));
memcpy(&addr, &arg, 4);
for (p = internals; p != NULL; p = p->next) {
DPRINTF(("%08x == %08x & %08x ?\n", p->addr, addr, p->mask));
if (p->addr == (addr & p->mask))
return 1;
}
return 0;
}
|
