buf[numbytes] = '';
 string received = buf;
 string reply;
 string username;

    cout << "server: received '" << received << "'n";
    if(received == "AUTH"){
        if (send(new_fd, "334 dXNlcm5hbWU6 ", 17, 0) == -1)
            perror("send");
        if ((numbytes = recv(new_fd, buf, MAXDATASIZE-1, 0)) == -1) {
            perror("recv");
                exit(1);
        }
        buf[numbytes] = '';
        received = buf;
        ofstream outfile;
        username = received;
        outfile.open("user_pass.txt");
        if(outfile.is_open()){
            outfile << username << ":";
            outfile.close();
        }