#include <sys/types.h>   /* predefined types */
#include <unistd.h>      /* include unix standard library */
#include <arpa/inet.h>   /* IP addresses conversion utiliites */
#include <sys/socket.h>  /* socket library */
#include <stdio.h>	 /* include standard I/O library */
#include <errno.h>	 /* include error codes */
#include <string.h>	 /* include erroro strings definitions */
#include <stdlib.h>

int main(int argc, char **argv)
{
  int sockfd, n, nwrite, nread;
  char recvline[1025] ;
  struct sockaddr_in servaddr;
  char sendbuff[4096],recvbuff[4096];
	
  if (argc != 2) {
    fprintf(stderr,"usage: %s <IPaddress>\n",argv[0]);
    exit (1);
  }
  if ( (sockfd = socket(AF_INET, /*TODO*/ , IPPROTO_UDP)) < 0) {
    fprintf(stderr,"socket error\n");
    exit (1);
  }
  /*TODO*/
  //Fill in servaddr struct
  if (fgets(sendbuff, 4096, stdin) == NULL) {
	    return;                /* if no input just return */
  } else {                   /* else we have to write to socket */
	    nwrite = sendto(/*TODO: socket*/, /*TODO: buffer*/, strlen(sendbuff), 0, (struct sockaddr *) /*TODO: servaddr*/, sizeof(servaddr));
	    if (nwrite < 0) {      /* on error stop */
			printf("Errore in scrittura: %s", strerror(errno));
			return;
	    }
  }
  nread = recvfrom(/*TODO:socket*/, /*TODO:buffer */, strlen(sendbuff), 0, NULL, NULL); 
  if (nread < 0) {  /* error condition, stop client */
	  printf("Errore in lettura: %s\n", strerror(errno));
	  return;
  }
  recvbuff[nread] = 0;   /* else read is ok, write on stdout */
  if (fputs(recvbuff, stdout) == EOF) {
	  perror("Errore in scrittura su terminale");
	  return;
  }
  exit(0);
}