talk(1): Raise WARNS to 6 and fix warnings.
[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.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
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32 *
33 * @(#)get_names.c 8.1 (Berkeley) 6/6/93
34 * $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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35 */
36
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37#include <err.h>
38#include <pwd.h>
39#include <stdlib.h>
40#include <string.h>
41#include <sys/param.h>
42#include "talk.h"
43
44extern CTL_MSG msg;
45
46static void
47usage(void)
48{
49 fprintf(stderr, "usage: talk person [ttyname]\n");
50 exit(1);
51}
52
53/*
54 * Determine the local and remote user, tty, and machines
55 */
56void
1d1731fa 57get_names(int argc, char **argv)
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58{
59 char hostname[MAXHOSTNAMELEN];
60 char *his_name, *my_name;
61 char *my_machine_name, *his_machine_name;
e2daa382 62 const char *his_tty;
815943a9 63 char *cp;
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64
65 if (argc < 2 )
66 usage();
67 if (!isatty(0))
68 errx(1, "standard input must be a tty, not a pipe or a file");
69 if ((my_name = getlogin()) == NULL) {
70 struct passwd *pw;
71
72 if ((pw = getpwuid(getuid())) == NULL)
73 errx(1, "you don't exist. Go away");
74 my_name = pw->pw_name;
75 }
76 gethostname(hostname, sizeof (hostname));
77 my_machine_name = hostname;
78 /* check for, and strip out, the machine name of the target */
43b4d1bd 79 for (cp = argv[1]; *cp && !strchr("@:!", *cp); cp++)
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80 ;
81 if (*cp == '\0') {
82 /* this is a local to local talk */
83 his_name = argv[1];
84 his_machine_name = my_machine_name;
85 } else {
86 if (*cp++ == '@') {
87 /* user@host */
88 his_name = argv[1];
89 his_machine_name = cp;
90 } else {
91 /* host!user or host:user */
92 his_name = cp;
93 his_machine_name = argv[1];
94 }
95 *--cp = '\0';
96 }
97 if (argc > 2)
98 his_tty = argv[2]; /* tty name is arg 2 */
99 else
100 his_tty = "";
101 get_addrs(my_machine_name, his_machine_name);
102 /*
103 * Initialize the message template.
104 */
105 msg.vers = TALK_VERSION;
106 msg.addr.sa_family = htons(AF_INET);
107 msg.ctl_addr.sa_family = htons(AF_INET);
108 msg.id_num = htonl(0);
109 strncpy(msg.l_name, my_name, NAME_SIZE);
110 msg.l_name[NAME_SIZE - 1] = '\0';
111 strncpy(msg.r_name, his_name, NAME_SIZE);
112 msg.r_name[NAME_SIZE - 1] = '\0';
113 strncpy(msg.r_tty, his_tty, TTY_SIZE);
114 msg.r_tty[TTY_SIZE - 1] = '\0';
115}