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
|
/*****************************************************************************
* Mandrake Security *
* Written by Vandoorselaere Yoann *
* (C) 1999, Mandrakesoft *
*****************************************************************************/
/*****
*
* Copyright (C) 1999 Mandrakesoft
* All Rights Reserved
*
* This file is part of the Mandrake Security program.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*****/
/*
* This program will verify each interface on the machine to
* see if one of them is in promisc state.
*
* In this program, buf is an array containing many structure ifreq...
* this allow you to print out :
* ( BUFSIZ / sizeof(struct ifreq )) number of ether card configuration.
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
static int quiet_mode = 0;
void usage(void);
void check_args(int argc, char **argv);
void PrintResult(struct ifreq *ifr);
int main(int argc, char **argv)
{
struct ifconf ifc;
char buf[BUFSIZ], *ptr, *ptr_end;
int ret, sock;
check_args(argc, argv);
sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0) {
perror("socket");
exit(1);
}
ifc.ifc_len = sizeof(buf);
ifc.ifc_buf = buf;
ret = ioctl(sock, SIOCGIFCONF, (char *) &ifc);
if (ret < 0) {
perror("ioctl: SIOCGIFCONF");
exit(1);
}
ptr_end = buf + ifc.ifc_len;
for (ptr = ifc.ifc_buf; ptr < ptr_end; ptr += sizeof(struct ifreq)) {
struct ifreq *ifr;
ifr = (struct ifreq *) ptr;
ret = ioctl(sock, SIOCGIFFLAGS, (char *) ifr);
if (ret < 0) {
perror("ioctl : SIOCGIFFLAGS");
exit(1);
}
PrintResult(ifr);
}
close(sock);
exit(0);
}
void PrintResult(struct ifreq *ifr)
{
if (quiet_mode == 0) {
if ((ifr->ifr_flags & IFF_PROMISC) != 0)
printf("%s : Promiscuous mode detected.\n",
ifr->ifr_name);
else
printf("%s : Not in promiscuous mode.\n",
ifr->ifr_name);
} else {
if ((ifr->ifr_flags & IFF_PROMISC) != 0)
printf("%s\n", ifr->ifr_name);
}
}
void check_args(int argc, char **argv)
{
while (1) {
int c;
c = getopt(argc, argv, "qh");
if (c == -1)
break;
switch (c) {
case 'q':
quiet_mode = 1;
break;
case 'h':
usage();
exit(0);
default:
exit(1);
}
}
}
void usage(void)
{
fprintf(stderr, "Usage:\n");
fprintf(stderr,
"\t-q Quiet mode ( only report interface name ).\n\n");
}
|
