get_names.c revision 1.16 
1/*	$OpenBSD: get_names.c,v 1.16 2006/10/29 22:18:32 otto Exp $	*/
2/*	$NetBSD: get_names.c,v 1.4 1994/12/09 02:14:16 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
35static char sccsid[] = "@(#)get_names.c	8.1 (Berkeley) 6/6/93";
36#endif
37static const char rcsid[] = "$OpenBSD: get_names.c,v 1.16 2006/10/29 22:18:32 otto Exp $";
38#endif /* not lint */
39
40#include "talk.h"
41#include <sys/param.h>
42#include <pwd.h>
43#include <stdlib.h>
44#include <unistd.h>
45
46extern	CTL_MSG msg;
47
48/*
49 * Determine the local and remote user, tty, and machines
50 */
51void
52get_names(argc, argv)
53	int argc;
54	char *argv[];
55{
56	char hostname[MAXHOSTNAMELEN];
57	char *his_name, *my_name;
58	char *my_machine_name, *his_machine_name;
59	char *his_tty;
60	char *cp;
61	char *names;
62
63	if (argc > 1 && !strcmp(argv[1], "-H")) {
64		argv[1] = argv[0];
65		++argv;
66		--argc;
67		high_print = 1;
68	}
69
70	if (argc > 1 && !strcmp(argv[1], "-s")) {
71		argv[1] = argv[0];
72		++argv;
73		--argc;
74		smooth_scroll = TRUE;
75	}
76
77	if ((argc < 2 ) || ('@' == argv[1][0])) {
78		fprintf(stderr, "usage: talk [-Hs] user [ttyname]\n"
79				"       talk [-Hs] user@hostname [ttyname]\n");
80		exit(1);
81	}
82	if (!isatty(STDIN_FILENO))
83		errx(1, "standard input must be a tty, not a pipe or a file");
84
85	if ((my_name = getlogin()) == NULL) {
86		struct passwd *pw;
87
88		if ((pw = getpwuid(getuid())) == NULL)
89			errx(1, "you don't exist in the passwd file.");
90		my_name = pw->pw_name;
91	}
92	gethostname(hostname, sizeof (hostname));
93	my_machine_name = hostname;
94	/* check for, and strip out, the machine name of the target */
95	names = strdup(argv[1]);
96	if (names == NULL)
97		errx(1, "out of memory");
98	for (cp = names; *cp && !strchr("@:!.", *cp); cp++)
99		;
100	if (*cp == '\0') {
101		/* this is a local to local talk */
102		his_name = names;
103		his_machine_name = my_machine_name;
104	} else {
105		if (*cp++ == '@') {
106			/* user@host */
107			his_name = names;
108			his_machine_name = cp;
109		} else {
110			/* host.user or host!user or host:user */
111			his_name = cp;
112			his_machine_name = names;
113		}
114		*--cp = '\0';
115	}
116	if (argc > 2)
117		his_tty = argv[2];	/* tty name is arg 2 */
118	else
119		his_tty = "";
120	get_addrs(my_machine_name, his_machine_name);
121	/*
122	 * Initialize the message template.
123	 */
124	msg.vers = TALK_VERSION;
125	msg.addr.sa_family = htons(AF_INET);
126	msg.ctl_addr.sa_family = htons(AF_INET);
127	msg.id_num = htonl(0);
128	strncpy(msg.l_name, my_name, NAME_SIZE);
129	msg.l_name[NAME_SIZE - 1] = '\0';
130	strncpy(msg.r_name, his_name, NAME_SIZE);
131	msg.r_name[NAME_SIZE - 1] = '\0';
132	strncpy(msg.r_tty, his_tty, TTY_SIZE);
133	msg.r_tty[TTY_SIZE - 1] = '\0';
134	free(names);
135}
136