xref: /freebsd/usr.bin/talk/get_addrs.c (revision 641a6cfb86023499caafe26a4d821a0b885cf00b)
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  * 4. Neither the name of the University nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29 
30 #include <sys/cdefs.h>
31 
32 __FBSDID("$FreeBSD$");
33 
34 #ifndef lint
35 static const char sccsid[] = "@(#)get_addrs.c	8.1 (Berkeley) 6/6/93";
36 #endif
37 
38 #include <err.h>
39 #include <netdb.h>
40 #include <string.h>
41 #include <unistd.h>
42 
43 #include "talk.h"
44 #include "talk_ctl.h"
45 
46 void
47 get_addrs(const char *my_machine_name __unused, const char *his_machine_name)
48 {
49 	struct hostent *hp;
50 	struct servent *sp;
51 
52 	msg.pid = htonl(getpid());
53 
54 	hp = gethostbyname(his_machine_name);
55 	if (hp == NULL)
56 		errx(1, "%s: %s", his_machine_name, hstrerror(h_errno));
57 	bcopy(hp->h_addr, (char *) &his_machine_addr, hp->h_length);
58 	if (get_iface(&his_machine_addr, &my_machine_addr) == -1)
59 		err(1, "failed to find my interface address");
60 	/* find the server's port */
61 	sp = getservbyname("ntalk", "udp");
62 	if (sp == 0)
63 		errx(1, "ntalk/udp: service is not registered");
64 	daemon_port = sp->s_port;
65 }
66