\" Copyright (c) 1986 Regents of the University of California.
\" All rights reserved.  The Berkeley software License Agreement
\" specifies the terms and conditions for redistribution.
\"
\"      @(#)dgramsend.c 6.2 (Berkeley) 5/8/86
\"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>

#define DATA "The sea is calm tonight, the tide is full . . ."

/*
* Here I send a datagram to a receiver whose name I get from the command
* line arguments.  The form of the command line is dgramsend hostname
* portnumber
*/

main(argc, argv)
       int argc;
       char *argv[];
{
       int sock;
       struct sockaddr_in name;
       struct hostent *hp, *gethostbyname();

       /* Create socket on which to send. */
       sock = socket(AF_INET, SOCK_DGRAM, 0);
       if (sock < 0) {
               perror("opening datagram socket");
               exit(1);
       }
       /*
        * Construct name, with no wildcards, of the socket to send to.
        * Getnostbyname() returns a structure including the network address
        * of the specified host.  The port number is taken from the command
        * line.
        */
       hp = gethostbyname(argv[1]);
       if (hp == 0) {
               fprintf(stderr, "%s: unknown host\n", argv[1]);
               exit(2);
       }
       bcopy(hp->h_addr, &name.sin_addr, hp->h_length);
       name.sin_family = AF_INET;
       name.sin_port = htons(atoi(argv[2]));
       /* Send message. */
       if (sendto(sock, DATA, sizeof(DATA), 0, &name, sizeof(name)) < 0)
               perror("sending datagram message");
       close(sock);
}