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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 <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <linux/if_ether.h>
#include "mactelnet.h"
#include "config.h"
unsigned char mt_mactelnet_cpmagic[4] = { 0x56, 0x34, 0x12, 0xff };
unsigned char mt_mactelnet_clienttype[2] = { 0x00, 0x15 };
int initPacket(struct mt_packet *packet, unsigned char ptype, unsigned char *srcmac, unsigned char *dstmac, unsigned short sessionkey, unsigned int counter) {
unsigned char *data = packet->data;
/* 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;
/* Client type: Mac Telnet */
memcpy(data + 16, &mt_mactelnet_clienttype, sizeof(mt_mactelnet_clienttype));
/* 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 */
packet->size = 22;
return 22;
}
int addControlPacket(struct mt_packet *packet, char cptype, void *cpdata, int data_len) {
unsigned char *data = packet->data + packet->size;
/* Something is really wrong. Packets should never become over 1500 bytes */
if (packet->size + MT_CPHEADER_LEN + data_len > MT_PACKET_LEN) {
fprintf(stderr, "addControlPacket: ERROR, too large packet. Exceeds %d bytes\n", MT_PACKET_LEN);
exit(1);
}
/* PLAINDATA isn't really a controlpacket, but we handle it here, since
parseControlPacket also parses raw data as PLAINDATA */
if (cptype == MT_CPTYPE_PLAINDATA) {
memcpy(data, cpdata, data_len);
packet->size += data_len;
return 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 + MT_CPHEADER_LEN, cpdata, data_len);
}
packet->size += MT_CPHEADER_LEN + data_len;
/* Control packet header length + data length */
return MT_CPHEADER_LEN + 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);
/* server type */
memcpy(&(pkthdr->clienttype), data+14, 2);
/* 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) {
/* 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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