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
|
/* $OpenBSD: get.c,v 1.6 2004/04/14 20:37:28 henning Exp $ */
/*
* Copyright (c) 1993-95 Mats O Jansson. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#ifndef LINT
static const char rcsid[] =
"$OpenBSD: get.c,v 1.6 2004/04/14 20:37:28 henning Exp $";
#endif
#include <sys/types.h>
#include "common/mopdef.h"
u_char
mopGetChar(u_char *pkt, int *index)
{
u_char ret;
ret = pkt[*index];
*index = *index + 1;
return (ret);
}
u_short
mopGetShort(u_char *pkt, int *index)
{
u_short ret;
ret = pkt[*index] + pkt[*index+1]*256;
*index = *index + 2;
return (ret);
}
u_long
mopGetLong(u_char *pkt, int *index)
{
u_long ret;
ret = pkt[*index] + pkt[*index+1]*0x100 + pkt[*index+2]*0x10000 +
pkt[*index+3]*0x1000000;
*index = *index + 4;
return (ret);
}
void
mopGetMulti(u_char *pkt, int *index, u_char *dest, int size)
{
int i;
for (i = 0; i < size; i++)
dest[i] = pkt[*index+i];
*index = *index + size;
}
int
mopGetTrans(u_char *pkt, int trans)
{
u_short *ptype;
if (trans == 0) {
ptype = (u_short *)(pkt+12);
if (ntohs(*ptype) < 1600)
trans = TRANS_8023;
else
trans = TRANS_ETHER;
}
return (trans);
}
void
mopGetHeader(u_char *pkt, int *index, u_char **dst, u_char **src,
u_short *proto, int *len, int trans)
{
*dst = pkt;
*src = pkt + 6;
*index = *index + 12;
switch (trans) {
case TRANS_ETHER:
*proto = (u_short)(pkt[*index] * 256 + pkt[*index + 1]);
*index = *index + 2;
*len = (int)(pkt[*index + 1] * 256 + pkt[*index]);
*index = *index + 2;
break;
case TRANS_8023:
*len = (int)(pkt[*index] * 256 + pkt[*index + 1]);
*index = *index + 8;
*proto = (u_short)(pkt[*index] * 256 + pkt[*index + 1]);
*index = *index + 2;
break;
}
}
u_short
mopGetLength(u_char *pkt, int trans)
{
switch (trans) {
case TRANS_ETHER:
return (pkt[15] * 256 + pkt[14]);
break;
case TRANS_8023:
return (pkt[12] * 256 + pkt[13]);
break;
}
return (0);
}
|
