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

int main(int argc, char **argv)
{
  u_short port;                 /* user specified port number */
  char addr[1023];              /* will be a copy of address entered by u */
  struct sockaddr_in address;   /* the libc network address data structure */
  short int sock = -1;          /* file descriptor for the network socket */
  port = atoi(argv[1]);
  /* addr = strncpy(addr, argv[2], 1023); */
  strncpy(addr, argv[2], 1023);
  bzero((char *) &address, sizeof(address));    /* init addr struct */
  address.sin_addr.s_addr = inet_addr(addr);    /* assign the address */
  address.sin_port = htons(port);       /* translate int2port num */
  sock = socket(AF_INET, SOCK_STREAM, 0);
  if (connect(sock, (struct sockaddr *) &address, sizeof(address)) == 0)
    printf("%i is open on %s\n", port, argv[2]);
  if (errno == 113)
    fprintf(stderr, "F*^k - no route to host\n");
  close(sock);
  return 0;
}