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/*
ifpromisc - This is a simple subset of Fred N. van Kempen,
<waltje@uwalt.nl.mugnet.org>'s ifconfig.
Show state of all ethernet interface
xxx is PROMISC
or
xxx is not promisc
Version: @(#)ifpromisc.c 0.5 2000/12/21
Last Changes: Ports for Solaris
Andre Gustavo <gustavo@anita.visualnet.com.br>
Port for OpenBSD
Nelson Murilo, <nelson@pangeia.com.br>
Author: Nelson Murilo, <nelson@pangeia.com.br>
Copyright 1997-2000 (C) Pangeia Informatica
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 of the License, or (at
your option) any later version.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#ifdef __linux__
#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#else
#include <net/if.h>
#ifndef __OpenBSD__
#include <net/if_arp.h>
#endif
#endif
#ifdef SOLARIS2
#include <sys/sockio.h>
#endif
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
struct interface
{
char name[IFNAMSIZ]; /* interface name */
short type; /* if type */
short flags; /* various flags */
};
/* This structure defines protocol families and their handlers. */
struct aftype {
char *name;
char *title;
int af;
int alen;
char *(*print) (unsigned char *);
char *(*sprint) (struct sockaddr *, int numeric);
int (*input) (char *bufp, struct sockaddr *);
void (*herror) (char *text);
};
char *Release = "chkrootkit package",
*Version = "@(#) ifpromisc 0.3 (20/02/97)";
int skfd = -1; /* AF_INET raw socket desc. */
static void ife_print(struct interface *ptr)
{
printf("%s is ", ptr->name);
if (ptr->flags & IFF_PROMISC)
printf("PROMISC");
else
printf("not promisc");
putchar('\n');
}
/* Fetch the inteface configuration from the kernel. */
static int if_fetch(char *ifname, struct interface *ife)
{
struct ifreq ifr;
memset((char *) ife, 0, sizeof(struct interface));
strcpy(ife->name, ifname);
strcpy(ifr.ifr_name, ifname);
if (ioctl(skfd, SIOCGIFFLAGS, &ifr) < 0) return(-1);
ife->flags = ifr.ifr_flags;
return(0);
}
static void if_print()
{
char buff[1024];
struct interface ife;
struct ifconf ifc;
struct ifreq *ifr;
int i;
ifc.ifc_len = sizeof(buff);
ifc.ifc_buf = buff;
if (ioctl(skfd, SIOCGIFCONF, &ifc) < 0)
{
fprintf(stderr, "SIOCGIFCONF: %s\n", strerror(errno));
return;
}
ifr = ifc.ifc_req;
for (i = ifc.ifc_len / sizeof(struct ifreq); --i >= 0; ifr++)
{
if (if_fetch(ifr->ifr_name, &ife) < 0)
{
#ifdef __linux__
fprintf(stderr, "%s: unknown interface.\n", ifr->ifr_name);
#endif
continue;
}
if (!memcmp(ifr->ifr_name, "lo", 2))
continue;
ife_print(&ife);
}
}
int main(int argc, char **argv)
{
struct sockaddr sa;
struct aftype *ap;
/* Create a channel to the NET kernel. */
if ((skfd = socket(AF_INET, SOCK_DGRAM,0)) < 0) {
perror("socket");
exit(-1);
}
if_print();
(void) close(skfd);
exit(0);
}
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