1 /* $NetBSD: get_addrs.c,v 1.12 2015/06/16 22:54:11 christos Exp $ */
2
3 /*
4 * Copyright (c) 1983, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #ifndef lint
34 #if 0
35 static char sccsid[] = "@(#)get_addrs.c 8.1 (Berkeley) 6/6/93";
36 #endif
37 __RCSID("$NetBSD: get_addrs.c,v 1.12 2015/06/16 22:54:11 christos Exp $");
38 #endif /* not lint */
39
40 #include "talk.h"
41 #include <netdb.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <unistd.h>
45 #include <err.h>
46 #include "talk_ctl.h"
47
48 void
get_addrs(const char * my_machine_name,const char * his_machine_name)49 get_addrs(const char *my_machine_name, const char *his_machine_name)
50 {
51 struct hostent *hp;
52 struct servent *sp;
53
54 msg.pid = htonl(getpid());
55 /*
56 * If the callee is on-machine, just use loopback
57 * otherwise do a lookup...
58 */
59 if (strcmp(his_machine_name, my_machine_name) != 0) {
60 /* look up the address of the local host */
61 hp = gethostbyname(my_machine_name);
62 if (hp == NULL)
63 errx(EXIT_FAILURE, "%s: %s", my_machine_name,
64 hstrerror(h_errno));
65 memcpy(&my_machine_addr, hp->h_addr, sizeof(my_machine_addr));
66 hp = gethostbyname(his_machine_name);
67 if (hp == NULL)
68 errx(EXIT_FAILURE, "%s: %s", his_machine_name,
69 hstrerror(h_errno));
70 memcpy(&his_machine_addr, hp->h_addr, sizeof(his_machine_addr));
71 } else
72 his_machine_addr.s_addr = my_machine_addr.s_addr =
73 htonl(INADDR_LOOPBACK);
74
75 /* find the server's port */
76 sp = getservbyname("ntalk", "udp");
77 if (sp == 0)
78 errx(EXIT_FAILURE, "%s/%s: service is not registered.",
79 "ntalk", "udp");
80 daemon_port = sp->s_port;
81 }
82