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
|
/*
* $Id: libnet_link_pf.c,v 1.3 2004/01/03 20:31:02 mike Exp $
*
* libnet
* libnet_pf.c - pf routines
*
* Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
* All rights reserved.
*
* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* packet filter subroutines for tcpdump
* Extraction/creation by Jeffrey Mogul, DECWRL
*/
#include "common.h"
#include "../include/gnuc.h"
#ifdef HAVE_OS_PROTO_H
#include "../include/os-proto.h"
#endif
struct libnet_link_int *
libnet_open_link_interface(int8_t *device, int8_t *ebuf)
{
register struct libnet_link_int *l;
int16_t enmode;
int backlog = -1; /* request the most */
struct enfilter Filter;
struct endevp devparams;
l = (struct libnet_link_int *)malloc(sizeof(*l));
if (l == NULL)
{
snprintf(ebuf, LIBNET_ERRBUF_SIZE,
"libnet_open_link_int: %s", strerror(errno));
return (0);
}
memset(l, 0, sizeof(*l));
l->fd = pfopen(device, O_RDWR);
if (l->fd < 0)
{
snprintf(ebuf, LIBNET_ERRBUF_SIZE,
"pf open: %s: %s\nyour system may not be properly configured; see \"man packetfilter(4)\"",
device, strerror(errno));
goto bad;
}
enmode = ENTSTAMP|ENBATCH|ENNONEXCL;
if (ioctl(l->fd, EIOCMBIS, (caddr_t)&enmode) < 0)
{
snprintf(ebuf, LIBNET_ERRBUF_SIZE,
"EIOCMBIS: %s", strerror(errno));
goto bad;
}
#ifdef ENCOPYALL
/* Try to set COPYALL mode so that we see packets to ourself */
enmode = ENCOPYALL;
ioctl(l->fd, EIOCMBIS, (caddr_t)&enmode); /* OK if this fails */
#endif
/* set the backlog */
if (ioctl(l->fd, EIOCSETW, (caddr_t)&backlog) < 0)
{
snprintf(ebuf, LIBNET_ERRBUF_SIZE,
"EIOCSETW: %s", strerror(errno));
goto bad;
}
/*
* discover interface type
*/
if (ioctl(l->fd, EIOCDEVP, (caddr_t)&devparams) < 0)
{
snprintf(ebuf, LIBNET_ERRBUF_SIZE,
"EIOCDEVP: %s", strerror(errno));
goto bad;
}
/* HACK: to compile prior to Ultrix 4.2 */
#ifndef ENDT_FDDI
#define ENDT_FDDI 4
#endif
switch (devparams.end_dev_type)
{
case ENDT_10MB:
l->linktype = DLT_EN10MB;
break;
case ENDT_FDDI:
l->linktype = DLT_FDDI;
break;
default:
/*
* XXX
* Currently, the Ultrix packet filter supports only
* Ethernet and FDDI. Eventually, support for SLIP and PPP
* (and possibly others: T1?) should be added.
*/
l->linktype = DLT_EN10MB;
break;
}
/*
* acceptag all packets
*/
bzero((int8_t *)&Filter, sizeof(Filter));
Filter.enf_Priority = 37; /* anything > 2 */
Filter.enf_FilterLen = 0; /* means "always true" */
if (ioctl(l->fd, EIOCSETF, (caddr_t)&Filter) < 0)
{
snprintf(ebuf, LIBNET_ERRBUF_SIZE,
"EIOCSETF: %s", strerror(errno));
goto bad;
}
return (l);
bad:
free(l);
return (NULL);
}
int
libnet_close_link_interface(struct libnet_link_int *l)
{
if (close(l->fd) == 0)
{
free(l);
return (1);
}
else
{
free(l);
return (-1);
}
}
int
libnet_write_link_layer(struct libnet_link_int *l, const int8_t *device,
const uint8_t *buf, int len)
{
int c;
c = write(l->fd, buf, len);
if (c != len)
{
snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
"libnet_write_link: %d bytes written (%s)", c,
strerror(errno));
}
return (c);
}
/**
* Local Variables:
* indent-tabs-mode: nil
* c-file-style: "stroustrup"
* End:
*/
|
