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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 <string.h>
#include <stdio.h>
#include <linux/if_ether.h>
#include "mactelnet.h"
#include "config.h"
unsigned char mt_mactelnet_cpmagic[4] = { 0x56, 0x34, 0x12, 0xff };
int initPacket(unsigned char *data, unsigned char ptype, unsigned char *srcmac, unsigned char *dstmac, unsigned short sessionkey, unsigned short counter) {
/* Packet version */
data[0] = 1;
/* Packet type */
data[1] = ptype;
/* src ethernet address */
memcpy(data + 2, srcmac, ETH_ALEN);
/* dst ethernet address */
memcpy(data + 8, dstmac, ETH_ALEN);
/* Session key */
data[14] = sessionkey >> 8;
data[15] = sessionkey & 0xff;
/* Magic number */
data[16] = 0x00;
data[17] = 0x15;
/* Received/sent data counter */
data[18] = (counter >> 24) & 0xff;
data[19] = (counter >> 16) & 0xff;
data[20] = (counter >> 8) & 0xff;
data[21] = counter & 0xff;
/* 22 bytes header */
return 22;
}
int addControlPacket(unsigned char *data, unsigned char cptype, void *cpdata, int data_len) {
/* Control Packet Magic id */
memcpy(data, mt_mactelnet_cpmagic, sizeof(mt_mactelnet_cpmagic));
/* Control packet type */
data[4] = cptype;
/* Data length */
data[5] = (data_len >> 24) & 0xff;
data[6] = (data_len >> 16) & 0xff;
data[7] = (data_len >> 8) & 0xff;
data[8] = data_len & 0xff;
/* Insert data */
if (data_len) {
memcpy(data+9, cpdata, data_len);
}
/* Control packet header length + data length */
return 9+data_len;
}
void parsePacket(unsigned char *data, struct mt_mactelnet_hdr *pkthdr) {
/* Packet version */
pkthdr->ver = data[0];
/* Packet type */
pkthdr->ptype = data[1];
/* src ethernet addr */
memcpy(pkthdr->srcaddr, data+2,6);
/* dst ethernet addr */
memcpy(pkthdr->dstaddr, data+8,6);
/* Session key */
pkthdr->seskey = data[16] << 8 | data[17];
/* Received/sent data counter */
pkthdr->counter = data[18] << 24 | data[19] << 16 | data[20] << 8 | data[21];
/* Set pointer to actual data */
pkthdr->data = data + 22;
}
int parseControlPacket(unsigned char *data, const int data_len, struct mt_mactelnet_control_hdr *cpkthdr) {
if (data_len < 0)
return 0;
/* Check for valid minimum packet length & magic header */
if (data_len >= 9 && memcmp(data, &mt_mactelnet_cpmagic, 4) == 0) {
if (DEBUG)
printf("\t----Control packet:\n\t\tType: %d\n\t\tLength: %d\n", data[4], data[5]<<24|data[6]<<16|data[7]<<8|data[8]);
/* Control packet type */
cpkthdr->cptype = data[4];
/* Control packet data length */
cpkthdr->length = data[5]<<24|data[6]<<16|data[7]<<8|data[8];
/* Set pointer to actual data */
cpkthdr->data = data + 9;
/* Return number of bytes in packet */
return cpkthdr->length + 9;
} else {
/* Mark data as raw terminal data */
cpkthdr->cptype = MT_CPTYPE_PLAINDATA;
cpkthdr->length = data_len;
cpkthdr->data = data;
/* Consume the whole rest of the packet */
return data_len;
}
}
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