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/*****************************************************************************
* Mandriva Linux Security *
* Written by Vandoorselaere Yoann *
* (C) 1999-2005, Mandriva *
*****************************************************************************/
/*****
*
* Copyright (C) 1999-2005 Mandriva
* 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 <stdlib.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");
}
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