1 /* $OpenBSD: get_addrs.c,v 1.7 2004/03/16 01:11:09 tedu Exp $ */
2 /* $NetBSD: get_addrs.c,v 1.3 1994/12/09 02:14:14 jtc Exp $ */
3
4 /*
5 * Copyright (c) 1983, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #ifndef lint
34 #if 0
35 static char sccsid[] = "@(#)get_addrs.c 8.1 (Berkeley) 6/6/93";
36 #endif
37 static const char rcsid[] = "$OpenBSD: get_addrs.c,v 1.7 2004/03/16 01:11:09 tedu Exp $";
38 #endif /* not lint */
39
40 #include "talk.h"
41 #include <netdb.h>
42 #include <stdio.h>
43 #include <unistd.h>
44 #include "talk_ctl.h"
45
46 void
get_addrs(my_machine_name,his_machine_name)47 get_addrs(my_machine_name, his_machine_name)
48 char *my_machine_name, *his_machine_name;
49 {
50 struct hostent *hp;
51 struct servent *sp;
52
53 msg.pid = htonl(getpid());
54 /* look up the address of the local host */
55 hp = gethostbyname(my_machine_name);
56 if (hp == NULL)
57 errx(1, "%s: %s", my_machine_name, hstrerror(h_errno));
58 memmove((char *)&my_machine_addr, hp->h_addr, hp->h_length);
59 /*
60 * If the callee is on-machine, just copy the
61 * network address, otherwise do a lookup...
62 */
63 if (strcmp(his_machine_name, my_machine_name)) {
64 hp = gethostbyname(his_machine_name);
65 if (hp == NULL)
66 errx(1, "%s: %s", his_machine_name, hstrerror(h_errno));
67 memmove((char *) &his_machine_addr, hp->h_addr, hp->h_length);
68 } else
69 his_machine_addr = my_machine_addr;
70 /* find the server's port */
71 sp = getservbyname("ntalk", "udp");
72 if (sp == NULL)
73 errx(1, "ntalk/udp: service is not registered.");
74 daemon_port = sp->s_port;
75 }
76