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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 <stdio.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <linux/if_ether.h>
#include <openssl/md5.h>
#include "mactelnet.h"
#include "udp.h"
#include "console.h"
#include "config.h"
int sockfd;
int counter=0;
int outcounter=0;
int sessionkey=0;
unsigned char *src = "00:e0:81:b5:ac:8e";
unsigned char dstmem[] = "00:0c:42:43:58:a4";
unsigned char *dst = dstmem;
unsigned char encryptionkey[128];
unsigned char username[255];
unsigned char password[255];
void sendAuthData(unsigned char *username, unsigned char *password) {
unsigned char data[1500];
unsigned char *terminal = "linux";
int userLen = strlen(username);
int terminalLen = strlen(terminal);
unsigned short width = 0;
unsigned short height = 0;
int result;
int plen;
int databytes;
plen = initPacket(data, MT_PTYPE_DATA, src, dst, sessionkey, outcounter);
databytes = plen;
plen += addControlPacket(data + plen, MT_CPTYPE_PASSWORD, password, 17);
plen += addControlPacket(data + plen, MT_CPTYPE_USERNAME, username, userLen);
plen += addControlPacket(data + plen, MT_CPTYPE_TERM_TYPE, terminal, terminalLen);
if (getTerminalSize(&width, &height) > 0) {
plen += addControlPacket(data + plen, MT_CPTYPE_TERM_WIDTH, &width, 2);
plen += addControlPacket(data + plen, MT_CPTYPE_TERM_HEIGHT, &height, 2);
}
outcounter += plen - databytes;
result = sendCustomUDP(sockfd, src, dst, "213.236.240.252", 20561, "255.255.255.255", 20561, data, plen);
}
void handlePacket(unsigned char *data, int data_len) {
struct mt_mactelnet_hdr pkthdr;
struct mt_mactelnet_control_hdr cpkthdr;
parsePacket(data, &pkthdr);
if (DEBUG)
printf("Received packet:\n\tVersion %d\n\tType: %d\n\tSesskey: %d\n\tCounter: %d\n\n", pkthdr.ver, pkthdr.ptype, pkthdr.seskey, pkthdr.counter);
if (pkthdr.ptype == MT_PTYPE_DATA) {
char odata[200];
int plen=0,result=0;
int rest = 0;
unsigned char *p = data;
counter += data_len - 22;
plen = initPacket(odata, MT_PTYPE_ACK, src, dst, pkthdr.seskey, counter);
result = sendCustomUDP(sockfd, src, dst, "213.236.240.252", 20561, "255.255.255.255", 20561, odata, plen);
if (DEBUG)
printf("ACK: Plen = %d, Send result: %d\n", plen, result);
rest = data_len - 22;
p += 22;
while (rest > 0) {
int read = 0;
struct mt_mactelnet_control_hdr cpkt;
read = parseControlPacket(p, rest, &cpkt);
p += read;
rest -= read;
if (cpkt.cptype == MT_CPTYPE_ENCRYPTIONKEY) {
unsigned char md5data[100];
unsigned char md5sum[100];
MD5_CTX c;
memcpy(encryptionkey, cpkt.data, cpkt.length);
md5data[0] = 0;
strcpy(md5data+1, password);
strncat(md5data+1, encryptionkey, 16);
MD5_Init(&c);
MD5_Update(&c, md5data, 9+16);
MD5_Final(md5sum+1, &c);
md5sum[0] = 0;
sendAuthData(username, md5sum);
if (DEBUG)
printf("Received encryption key of %d characters\n", cpkt.length);
}
else if (cpkt.cptype == MT_CPTYPE_PLAINDATA) {
cpkt.data[cpkt.length] = 0;
printf("%s", cpkt.data);
}
}
}
else if (pkthdr.ptype == MT_PTYPE_ACK) {
// TODO: If we were resubmitting lost messages, stop resubmitting here if received counter is correct.
}
else if (pkthdr.ptype == MT_PTYPE_END) {
char odata[200];
int plen=0,result=0;
plen = initPacket(odata, MT_PTYPE_END, src, dst, pkthdr.seskey, 0);
result = sendCustomUDP(sockfd, src, dst, "213.236.240.252", 20561, "255.255.255.255", 20561, odata, plen);
fprintf(stderr, "Connection closed.\n");
exit(0);
} else {
fprintf(stderr, "Unhandeled packet type: %d received from server %s\n", pkthdr.ptype, dst);
}
}
int main (int argc, char **argv) {
int insockfd;
int result;
char data[200];
struct sockaddr_in si_me;
char buff[1500];
int plen = 0;
if (argc < 3) {
fprintf(stderr, "Usage: %s <MAC> <username> <password>\n", argv[0]);
return 1;
}
strncpy(dst, argv[1], 17);
strncpy(username, argv[2], 254);
strncpy(password, argv[3], 254);
srand(time(NULL));
// Transmit raw packets with this socket
sockfd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
// Receive regular udp packets with this socket
insockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
// Initialize receiving socket
memset((char *) &si_me, 0, sizeof(si_me));
si_me.sin_family = AF_INET;
si_me.sin_port = htons(20561);
si_me.sin_addr.s_addr = htonl(INADDR_ANY);
// Bind to udp port
if (bind(insockfd, (struct sockaddr *)&si_me, sizeof(si_me))==-1) {
fprintf(stderr, "Error binding to port 20561\n");
return 1;
}
// Sessioon key
sessionkey = rand() % 65535;
printf("Connecting to %s...\n", dst);
plen = initPacket(data, MT_PTYPE_SESSIONSTART, src, dst, sessionkey, 0);
result = sendCustomUDP(sockfd, src, dst, "213.236.240.252", 20561, "255.255.255.255", 20561, data, plen);
if (DEBUG)
printf("Plen = %d, Send result: %d\n", plen, result);
if (DEBUG)
printf("Sessionkey: %d\n", sessionkey);
result = recvfrom(insockfd, buff, 1400, 0, 0, 0);
handlePacket(buff, result);
// TODO: Should resubmit whenever a PTYPE_DATA packet is sent, and an ACK packet with correct datacounter is received
// or time out the connection, in all other cases.
plen = initPacket(data, MT_PTYPE_DATA, src, dst, sessionkey, 0);
plen += addControlPacket(data + plen, MT_CPTYPE_BEGINAUTH, NULL, 0);
outcounter += 9;
result = sendCustomUDP(sockfd, src, dst, "213.236.240.252", 20561, "255.255.255.255", 20561, data, plen);
if (DEBUG)
printf("Plen = %d, Send result: %d\n", plen, result);
memset(buff, 0, 1500);
result = recvfrom(insockfd, buff, 1500, 0, 0, 0);
if (result < 1) {
fprintf(stderr, "Connection failed.\n");
return 1;
}
handlePacket(buff, result);
memset(buff, 0, 1500);
result = recvfrom(insockfd, buff, 1500, 0, 0, 0);
handlePacket(buff, result);
while(1) {
memset(buff, 0, 1500);
result = recvfrom(insockfd, buff, 1500, 0, 0, 0);
handlePacket(buff, result);
}
close(sockfd);
close(insockfd);
return 0;
}
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