bsd-family-tree: add NetBSD 7.0.2; Add recent DragonFly
[dragonfly.git] / usr.bin / talk / get_names.c
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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.
dc71b7ab 13 * 3. Neither the name of the University nor the names of its contributors
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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.
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28 *
29 * @(#)get_names.c 8.1 (Berkeley) 6/6/93
30 * $FreeBSD: src/usr.bin/talk/get_names.c,v 1.6.2.1 2001/07/30 10:31:29 dd Exp $
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31 */
32
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33#include <err.h>
34#include <pwd.h>
35#include <stdlib.h>
36#include <string.h>
37#include <sys/param.h>
38#include "talk.h"
39
40extern CTL_MSG msg;
41
42static void
43usage(void)
44{
45 fprintf(stderr, "usage: talk person [ttyname]\n");
46 exit(1);
47}
48
49/*
50 * Determine the local and remote user, tty, and machines
51 */
52void
1d1731fa 53get_names(int argc, char **argv)
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54{
55 char hostname[MAXHOSTNAMELEN];
56 char *his_name, *my_name;
57 char *my_machine_name, *his_machine_name;
e2daa382 58 const char *his_tty;
815943a9 59 char *cp;
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60
61 if (argc < 2 )
62 usage();
63 if (!isatty(0))
64 errx(1, "standard input must be a tty, not a pipe or a file");
65 if ((my_name = getlogin()) == NULL) {
66 struct passwd *pw;
67
68 if ((pw = getpwuid(getuid())) == NULL)
69 errx(1, "you don't exist. Go away");
70 my_name = pw->pw_name;
71 }
72 gethostname(hostname, sizeof (hostname));
73 my_machine_name = hostname;
74 /* check for, and strip out, the machine name of the target */
43b4d1bd 75 for (cp = argv[1]; *cp && !strchr("@:!", *cp); cp++)
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76 ;
77 if (*cp == '\0') {
78 /* this is a local to local talk */
79 his_name = argv[1];
80 his_machine_name = my_machine_name;
81 } else {
82 if (*cp++ == '@') {
83 /* user@host */
84 his_name = argv[1];
85 his_machine_name = cp;
86 } else {
87 /* host!user or host:user */
88 his_name = cp;
89 his_machine_name = argv[1];
90 }
91 *--cp = '\0';
92 }
93 if (argc > 2)
94 his_tty = argv[2]; /* tty name is arg 2 */
95 else
96 his_tty = "";
97 get_addrs(my_machine_name, his_machine_name);
98 /*
99 * Initialize the message template.
100 */
101 msg.vers = TALK_VERSION;
102 msg.addr.sa_family = htons(AF_INET);
103 msg.ctl_addr.sa_family = htons(AF_INET);
104 msg.id_num = htonl(0);
105 strncpy(msg.l_name, my_name, NAME_SIZE);
106 msg.l_name[NAME_SIZE - 1] = '\0';
107 strncpy(msg.r_name, his_name, NAME_SIZE);
108 msg.r_name[NAME_SIZE - 1] = '\0';
109 strncpy(msg.r_tty, his_tty, TTY_SIZE);
110 msg.r_tty[TTY_SIZE - 1] = '\0';
111}