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/*
Mac-Telnet - Connect to RouterOS clients via MAC address
Copyright (C) 2010, Håkon Nessjøen <haakon.nessjoen@gmail.com>
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.
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; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdlib.h>
#include <string.h>
#include <malloc.h>
#include <unistd.h>
#include <netinet/in.h>
#include <linux/if_ether.h>
#include <sys/ioctl.h>
#include <net/if.h>
/* Functions using NETDEVICE api */
int getDeviceIndex(int sockfd, unsigned char *deviceName) {
struct ifreq ifr;
strncpy(ifr.ifr_name, deviceName, 16);
if (ioctl(sockfd, SIOCGIFINDEX, &ifr) != 0) {
return -1;
}
/* Return interface index */
return ifr.ifr_ifindex;
}
int getDeviceMAC(const int sockfd, const unsigned char *deviceName, unsigned char *mac) {
struct ifreq ifr;
strncpy(ifr.ifr_name, deviceName, 16);
if (ioctl(sockfd, SIOCGIFHWADDR, &ifr) != 0) {
return -1;
}
/* Fetch mac address */
memcpy(mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
return 1;
}
int getDeviceIp(const int sockfd, const unsigned char *deviceName, struct sockaddr_in *ip) {
struct ifconf ifc;
struct ifreq *ifr;
int i,numDevices;
/*
* Do a initial query without allocating ifreq structs
* to count the number of ifreq structs to allocate memory for
*/
memset(&ifc, 0, sizeof(ifc));
if (ioctl(sockfd, SIOCGIFCONF, &ifc) != 0) {
return -1;
}
/*
* Allocate memory for interfaces, multiply by two in case
* the number of interfaces has increased since last ioctl
*/
if ((ifr = malloc(ifc.ifc_len * 2)) == NULL) {
perror("malloc");
exit(1);
}
ifc.ifc_req = ifr;
if (ioctl(sockfd, SIOCGIFCONF, &ifc) != 0) {
free(ifr);
return -1;
}
/* Iterate through all devices, searching for interface */
numDevices = ifc.ifc_len / sizeof(struct ifreq);
for (i = 0; i < numDevices; ++i) {
if (strcmp(ifr[i].ifr_name, deviceName) == 0) {
/* Fetch IP for found interface */
memcpy(ip, &(ifr[i].ifr_addr), sizeof(ip));
free(ifr);
return 1;
}
}
free(ifr);
return -1;
}
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