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/*
Mac-Telnet - Connect to RouterOS routers 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 <stdio.h>
#include <arpa/inet.h>
#include <netinet/ether.h>
#include <string.h>
#include "mactelnet.h"
#include "config.h"
int main(int argc, char **argv) {
int sock,result;
int optval = 1;
struct sockaddr_in si_me, si_remote;
unsigned char buff[MT_PACKET_LEN];
unsigned short nameLen = 0;
unsigned char name[MT_MNDP_MAX_NAME_LENGTH + 1];
unsigned char mac[ETH_ALEN];
/* Open a UDP socket handle */
sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
/* Set initialize address/port */
memset((char *) &si_me, 0, sizeof(si_me));
si_me.sin_family = AF_INET;
si_me.sin_port = htons(MT_MNDP_PORT);
si_me.sin_addr.s_addr = htonl(INADDR_ANY);
/* Bind to specified address/port */
if (bind(sock, (struct sockaddr *)&si_me, sizeof(si_me))==-1) {
fprintf(stderr, "Error binding to %s:%d\n", inet_ntoa(si_me.sin_addr), MT_MNDP_PORT);
return 1;
}
/* Write informative message to STDERR to make it easier to use the output in simple scripts */
fprintf(stderr, "Searching for MikroTik routers... Abort with CTRL+C.\n");
/* Set the socket to allow sending broadcast packets */
if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &optval, sizeof (optval))==-1) {
fprintf(stderr, "Unable to send broadcast packets: Operating in receive only mode.\n");
} else {
/* Request routers identify themselves */
unsigned int message = 0;
memset((char *) &si_remote, 0, sizeof(si_remote));
si_remote.sin_family = AF_INET;
si_remote.sin_port = htons(MT_MNDP_PORT);
si_remote.sin_addr.s_addr = htonl(INADDR_BROADCAST);
if (sendto (sock, &message, sizeof (message), 0, (struct sockaddr *)&si_remote, sizeof(si_remote))==-1) {
fprintf(stderr, "Unable to send broadcast packet: Operating in receive only mode.\n");
}
}
while(1) {
/* Wait for a UDP packet */
result = recvfrom(sock, buff, MT_PACKET_LEN, 0, 0, 0);
if (result < 0) {
fprintf(stderr, "Error occured. aborting\n");
exit(1);
}
/* Check for valid packet length */
if (result < 18) {
continue;
}
/* Fetch length of Identifier string */
memcpy(&nameLen, buff+16,2);
nameLen = (nameLen >> 8) | ((nameLen&0xff)<<8);
/* Enforce maximum name length */
nameLen = nameLen < sizeof(name) ? nameLen : MT_MNDP_MAX_NAME_LENGTH;
/* Read Identifier string */
memcpy(&name, buff+18, nameLen);
/* Append zero */
name[nameLen] = 0;
/* Read source MAC address */
memcpy(&mac, buff+8, ETH_ALEN);
/* Print it */
printf("%17s %s\n", ether_ntoa((struct ether_addr *)mac), name);
}
/* We'll never get here.. */
return 0;
}
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