#include        <sys/types.h>   /* basic system data types */
#include        <sys/socket.h>  /* basic socket definitions */
#include        <netinet/in.h>
#include        <stdio.h>
#include <sys/time.h>
#include	<strings.h>
#include        <arpa/inet.h>
#include	<stdlib.h>

//#include        <unistd.h>

#define MAXLINE 1024

void
dg_cli(FILE *fp, int sockfd, const struct sockaddr *pservaddr, int servlen)
{
  int     n;
  char    sendline[MAXLINE], recvline[MAXLINE + 1];

  while (fgets(sendline, MAXLINE, fp) != NULL) {

    sendto(sockfd, sendline, strlen(sendline), 0, pservaddr, servlen);

    n = recvfrom(sockfd, recvline, MAXLINE, 0, NULL, NULL);

    recvline[n] = 0;        /* null terminate */
    fputs(recvline, stdout);
  }
}


int
main(int argc, char **argv)
{
  int sockfd;
  struct sockaddr_in servaddr;

  if (argc != 2) {
    printf("usage: udpcli <IPaddress>");
    exit(-1);
  }

  bzero(&servaddr, sizeof(servaddr));
  servaddr.sin_family = AF_INET;
  servaddr.sin_port = htons(6789);
  //	inet_pton(AF_INET, argv[1], &servaddr.sin_addr);
  servaddr.sin_addr.s_addr = inet_addr(argv[1]);
  
  sockfd = socket(AF_INET, SOCK_DGRAM, 0);
  
  dg_cli(stdin, sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr));
  
  exit(0);
}