get_addrs.c revision 14443 
1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static char sccsid[] = "@(#)get_addrs.c	8.1 (Berkeley) 6/6/93";
36#endif /* not lint */
37
38#include <string.h>
39#include <netdb.h>
40#include <stdio.h>
41#include "talk.h"
42#include "talk_ctl.h"
43
44void
45get_addrs(my_machine_name, his_machine_name)
46	char *my_machine_name, *his_machine_name;
47{
48	struct hostent *hp;
49	struct servent *sp;
50
51	msg.pid = htonl(getpid());
52
53	hp = gethostbyname(his_machine_name);
54	if (hp == NULL) {
55		fprintf(stderr, "talk: %s: ", his_machine_name);
56		herror((char *)NULL);
57		exit(-1);
58	}
59	bcopy(hp->h_addr, (char *) &his_machine_addr, hp->h_length);
60	if (get_iface(&his_machine_addr, &my_machine_addr) == -1) {
61		perror("failed to find my interface address");
62		exit(-1);
63	}
64	/* find the server's port */
65	sp = getservbyname("ntalk", "udp");
66	if (sp == 0) {
67		fprintf(stderr, "talk: %s/%s: service is not registered.\n",
68		     "ntalk", "udp");
69		exit(-1);
70	}
71	daemon_port = sp->s_port;
72}
73