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#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 "mactelnet.h"
#include "udp.h"
#include "config.h"
int sockfd;
int counter=0;
unsigned char *src = "00:e0:81:b5:ac:8e";
unsigned char *dst = "00:0c:42:43:58:a4";
void handlePacket(unsigned char *data, int data_len) {
struct mt_mactelnet_hdr pkthdr;
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;
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);
if (data_len - 22 > 0) {
parseControlPacket(data + 22, data_len - 22);
}
}
}
int main (int argc, char **argv) {
int outsockfd;
int result;
char data[200];
struct sockaddr_in si_me;
char buff[1500];
int plen = 0;
int sessionkey=0;
srand(time(NULL));
sockfd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
outsockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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);
if (bind(outsockfd, (struct sockaddr *)&si_me, sizeof(si_me))==-1) {
fprintf(stderr, "Error binding to port 20561\n");
return 1;
}
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(outsockfd, 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);
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);
result = recvfrom(outsockfd, buff, 1400, 0, 0, 0);
handlePacket(buff, result);
result = recvfrom(outsockfd, buff, 1400, 0, 0, 0);
handlePacket(buff, result);
close(sockfd);
return 0;
}
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