get_addrs.c revision 87710 
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#include <sys/cdefs.h>
35
36__FBSDID("$FreeBSD: head/usr.bin/talk/get_addrs.c 87710 2001-12-11 23:51:14Z markm $");
37
38#ifndef lint
39static const char sccsid[] = "@(#)get_addrs.c	8.1 (Berkeley) 6/6/93";
40#endif
41
42#include <err.h>
43#include <netdb.h>
44#include <string.h>
45
46#include "talk.h"
47#include "talk_ctl.h"
48
49void
50get_addrs(my_machine_name, his_machine_name)
51	char *my_machine_name __unused, *his_machine_name;
52{
53	struct hostent *hp;
54	struct servent *sp;
55
56	msg.pid = htonl(getpid());
57
58	hp = gethostbyname(his_machine_name);
59	if (hp == NULL)
60		errx(1, "%s: %s", his_machine_name, hstrerror(h_errno));
61	bcopy(hp->h_addr, (char *) &his_machine_addr, hp->h_length);
62	if (get_iface(&his_machine_addr, &my_machine_addr) == -1)
63		err(1, "failed to find my interface address");
64	/* find the server's port */
65	sp = getservbyname("ntalk", "udp");
66	if (sp == 0)
67		errx(1, "ntalk/udp: service is not registered");
68	daemon_port = sp->s_port;
69}
70