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
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/*
* comparisons
* Copyright (C) 2000 Henry Spencer.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Library General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/lgpl.txt>.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
* License for more details.
*/
#include "internal.h"
#include "freeswan.h"
static int samenbits(const ip_address *a, const ip_address *b, int n);
/*
- addrcmp - compare two addresses
* Caution, the order of the tests is subtle: doing type test before
* size test can yield cases where a<b, b<c, but a>c.
*/
int /* like memcmp */
addrcmp(a, b)
const ip_address *a;
const ip_address *b;
{
int at = addrtypeof(a);
int bt = addrtypeof(b);
const unsigned char *ap;
const unsigned char *bp;
size_t as = addrbytesptr(a, &ap);
size_t bs = addrbytesptr(b, &bp);
size_t n = (as < bs) ? as : bs; /* min(as, bs) */
int c = memcmp(ap, bp, n);
if (c != 0) /* bytes differ */
return (c < 0) ? -1 : 1;
if (as != bs) /* comparison incomplete: lexical order */
return (as < bs) ? -1 : 1;
if (at != bt) /* bytes same but not same type: break tie */
return (at < bt) ? -1 : 1;
return 0;
}
/*
- sameaddr - are two addresses the same?
*/
int
sameaddr(a, b)
const ip_address *a;
const ip_address *b;
{
return (addrcmp(a, b) == 0) ? 1 : 0;
}
/*
- samesubnet - are two subnets the same?
*/
int
samesubnet(a, b)
const ip_subnet *a;
const ip_subnet *b;
{
if (!sameaddr(&a->addr, &b->addr)) /* also does type check */
return 0;
if (a->maskbits != b->maskbits)
return 0;
return 1;
}
/*
- subnetishost - is a subnet in fact a single host?
*/
int
subnetishost(a)
const ip_subnet *a;
{
return (a->maskbits == addrlenof(&a->addr)*8) ? 1 : 0;
}
/*
- samesaid - are two SA IDs the same?
*/
int
samesaid(a, b)
const ip_said *a;
const ip_said *b;
{
if (a->spi != b->spi) /* test first, most likely to be different */
return 0;
if (!sameaddr(&a->dst, &b->dst))
return 0;
if (a->proto != b->proto)
return 0;
return 1;
}
/*
- sameaddrtype - do two addresses have the same type?
*/
int
sameaddrtype(a, b)
const ip_address *a;
const ip_address *b;
{
return (addrtypeof(a) == addrtypeof(b)) ? 1 : 0;
}
/*
- samesubnettype - do two subnets have the same type?
*/
int
samesubnettype(a, b)
const ip_subnet *a;
const ip_subnet *b;
{
return (subnettypeof(a) == subnettypeof(b)) ? 1 : 0;
}
/*
- addrinsubnet - is this address in this subnet?
*/
int
addrinsubnet(a, s)
const ip_address *a;
const ip_subnet *s;
{
if (addrtypeof(a) != subnettypeof(s))
return 0;
if (!samenbits(a, &s->addr, s->maskbits))
return 0;
return 1;
}
/*
- subnetinsubnet - is one subnet within another?
*/
int
subnetinsubnet(a, b)
const ip_subnet *a;
const ip_subnet *b;
{
if (subnettypeof(a) != subnettypeof(b))
return 0;
if (a->maskbits < b->maskbits) /* a is bigger than b */
return 0;
if (!samenbits(&a->addr, &b->addr, b->maskbits))
return 0;
return 1;
}
/*
- samenbits - do two addresses have the same first n bits?
*/
static int
samenbits(a, b, nbits)
const ip_address *a;
const ip_address *b;
int nbits;
{
const unsigned char *ap;
const unsigned char *bp;
size_t n;
int m;
if (addrtypeof(a) != addrtypeof(b))
return 0; /* arbitrary */
n = addrbytesptr(a, &ap);
if (n == 0)
return 0; /* arbitrary */
(void) addrbytesptr(b, &bp);
if (nbits > n*8)
return 0; /* "can't happen" */
for (; nbits >= 8 && *ap == *bp; nbits -= 8, ap++, bp++)
continue;
if (nbits >= 8)
return 0;
if (nbits > 0) { /* partial byte */
m = ~(0xff >> nbits);
if ((*ap & m) != (*bp & m))
return 0;
}
return 1;
}
|
