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





// pegadata <localhost>
// peganome <nome da maquina>

int main(int argc, char *argv[])
{
   char *host;
   int sockfd;
   int len, result;

   struct sockaddr_in address;
   struct hostent *hostinfo;
   struct servent *servinfo;

   char buffer[128];

   

   if( argc == 1) host = "localhost";     
    else   host = argv[1];

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

   servinfo  =  getservbyname("daytime", "tcp");

   if (!servinfo) 
     {
       printf(" problema no getservbyname()!" );
       exit(1); 
     }


   printf("A porta do serviço daytime é: %d\n", ntohs(servinfo->s_port) );

   // criar socket 
   if ( (sockfd = socket(AF_INET, SOCK_STREAM, 0) )  < 0  )  // cria um novo socket
     {
       printf(" Houve erro na ebertura do socket ");
       exit(1);
     }


   //  criar endereço

   address.sin_family  = AF_INET;
   address.sin_port    = servinfo->s_port;
   address.sin_addr    = *(struct in_addr *)*hostinfo->h_addr_list;
   len = sizeof(address);

   result = connect(sockfd, (struct sockaddr *) &address, len);

   if( result == -1)
     {
       perror("  Erro na abertura da conexão ");
       exit(1);
     }
   
   result = read(sockfd, buffer, sizeof(buffer) );
   printf( " Foi lido %d bytes: %s\n", result, buffer);

   close(sockfd);
   exit(0);
}