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/*
Perl ARP Extension
Get the MAC address of an interface
Linux code
Programmed by Bastian Ballmann
Last update: 11.05.2022
This program is free software; you can redistribute
it and/or modify it under the terms of the
GNU General Public License version 2 as published
by the Free Software Foundation.
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.
*/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <net/ethernet.h>
#include <net/if.h>
#include "arp.h"
int get_mac_linux(const char *dev, char *mac)
{
int sock;
struct ifreq iface;
if ( !strlen(mac) || !strlen(dev) )
return -1;
/* Set hardware address as unknown */
strncpy(mac,"unknown", HEX_HW_ADDR_LEN);
mac[HEX_HW_ADDR_LEN - 1] = '\0';
/* Copy device name into the ifreq strcture so that we can look for its
* hardware address through an ioctl request */
strncpy(iface.ifr_name, dev, IFNAMSIZ);
iface.ifr_name[IFNAMSIZ - 1] = '\0';
// Open a socket
if((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
{
perror("socket");
return -1;
}
else
{
// Get the interface hardware address
if((ioctl(sock, SIOCGIFHWADDR, &iface)) < 0)
{
perror("ioctl SIOCGIFHWADDR");
close(sock);
return -1;
}
else
{
sprintf(mac,"%02x:%02x:%02x:%02x:%02x:%02x",
iface.ifr_hwaddr.sa_data[0] & 0xff,
iface.ifr_hwaddr.sa_data[1] & 0xff,
iface.ifr_hwaddr.sa_data[2] & 0xff,
iface.ifr_hwaddr.sa_data[3] & 0xff,
iface.ifr_hwaddr.sa_data[4] & 0xff,
iface.ifr_hwaddr.sa_data[5] & 0xff);
}
}
close(sock);
return 0;
}
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