// programa servidor7.cpp - Servidor que lê e escreve em um vetor de caracter
// Protocolo UDP

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


int main( )
{
   int server_sockfd, client_sockfd;
   size_t server_len;
   socklen_t client_len;
   struct sockaddr_in server_address;
   struct sockaddr_in client_address;

   unsigned short porta = 9734;

   unlink("server_socket");  // remocao de socket antigo
   if ( (server_sockfd = socket(AF_INET, SOCK_DGRAM, 0) )  < 0  )  // cria um novo socket
     {
       printf(" Houve erro na ebertura do socket ");
       exit(1);
     }
   server_address.sin_family = AF_INET;
   server_address.sin_addr.s_addr = htonl(INADDR_ANY);
   server_address.sin_port = htons(porta);
 

   server_len = sizeof(server_address);
  
   if(  bind(server_sockfd, (struct sockaddr *) &server_address, server_len) < 0 )
    {
      perror("Houve error no Bind");
      exit(1);
    }
   
 
   //listen(server_sockfd, 5);
   while(1){
      char vetor_ch[4];

      printf("Servidor esperando ...\n");
      
      //client_sockfd = accept(server_sockfd, (struct sockaddr *) &client_address, &client_len);
      client_len = sizeof(client_address);
      if(recvfrom(server_sockfd, vetor_ch, sizeof(vetor_ch),0,
          (struct sockaddr *) &client_address, &client_len) < 0 )
	{
          perror(" erro no RECVFROM( )");
          exit(1);
        } 
      for(int i =0; i<4;i++) {
        vetor_ch[i]++;
      }
      sendto(server_sockfd, vetor_ch, sizeof(vetor_ch),0,(struct sockaddr *) &client_address,sizeof(struct sockaddr));
      // close(server_sockfd);
   
   }
}