1 /* $OpenBSD: get_addrs.c,v 1.10 2016/02/01 07:29:25 mestre 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 #include <err.h>
34 #include <netdb.h>
35 #include <string.h>
36 #include <unistd.h>
37
38 #include "talk.h"
39 #include "talk_ctl.h"
40
41 void
get_addrs(char * my_machine_name,char * his_machine_name)42 get_addrs(char *my_machine_name, char *his_machine_name)
43 {
44 struct hostent *hp;
45 struct servent *sp;
46
47 msg.pid = htonl(getpid());
48 /* look up the address of the local host */
49 hp = gethostbyname(my_machine_name);
50 if (hp == NULL)
51 errx(1, "%s: %s", my_machine_name, hstrerror(h_errno));
52 bcopy(hp->h_addr, &my_machine_addr, hp->h_length);
53 /*
54 * If the callee is on-machine, just copy the
55 * network address, otherwise do a lookup...
56 */
57 if (strcmp(his_machine_name, my_machine_name)) {
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, &his_machine_addr, hp->h_length);
62 } else
63 his_machine_addr = my_machine_addr;
64 /* find the server's port */
65 sp = getservbyname("ntalk", "udp");
66 if (sp == NULL)
67 errx(1, "ntalk/udp: service is not registered.");
68 daemon_port = sp->s_port;
69 }
70