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

#include <sys/types.h>
#include <sys/socket.h>




// peganome <localhost>\par
// peganome <nome da maquina>\par

int main(int argc, char *argv[])
{
   char *host, **names, **addrs;
   struct hostent *hostinfo;

   // teste para pegar o nome

   if( argc == 1)
    {
     char myname[256];

     gethostname(myname,255);
     host = myname;     
    }
   else   host = argv[1];

   hostinfo = gethostbyname(host);
   if(!hostinfo)
    {
     printf("erro no gethostbyname()");
     exit(1);
    }

   printf("Resultados do host %s:\n", host);
   printf("Nome: %s\n", hostinfo->h_name);
   printf("Aliases: \n");
   names = hostinfo -> h_aliases;
   while(*names) {
     printf("       %s\n", *names);
     names++;
   }
 

   if(hostinfo->h_addrtype != AF_INET  ){
     printf("Não é um servidor IP");
     exit(1);
   }
   addrs = hostinfo->h_addr_list;
   while(*addrs)  {
     printf("Número IP: %s"
, inet_ntoa(*(struct in_addr *) *addrs));
     addrs++;
   }
   printf("\n");
   exit(0);
}