get_names.c revision 1.18 
1/*	$OpenBSD: get_names.c,v 1.18 2009/10/27 23:59:44 deraadt 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#include "talk.h"
34#include <sys/param.h>
35#include <pwd.h>
36#include <stdlib.h>
37#include <unistd.h>
38
39extern	CTL_MSG msg;
40
41/*
42 * Determine the local and remote user, tty, and machines
43 */
44void
45get_names(argc, argv)
46	int argc;
47	char *argv[];
48{
49	char hostname[MAXHOSTNAMELEN];
50	char *his_name, *my_name;
51	char *my_machine_name, *his_machine_name;
52	char *his_tty;
53	char *cp;
54	char *names;
55
56	if (argc > 1 && !strcmp(argv[1], "-H")) {
57		argv[1] = argv[0];
58		++argv;
59		--argc;
60		high_print = 1;
61	}
62
63	if (argc > 1 && !strcmp(argv[1], "-s")) {
64		argv[1] = argv[0];
65		++argv;
66		--argc;
67		smooth_scroll = TRUE;
68	}
69
70	if ((argc < 2 ) || ('@' == argv[1][0])) {
71		fprintf(stderr, "usage: talk [-Hs] person [ttyname]\n");
72		exit(1);
73	}
74	if (!isatty(STDIN_FILENO))
75		errx(1, "standard input must be a tty, not a pipe or a file");
76
77	if ((my_name = getlogin()) == NULL) {
78		struct passwd *pw;
79
80		if ((pw = getpwuid(getuid())) == NULL)
81			errx(1, "you don't exist in the passwd file.");
82		my_name = pw->pw_name;
83	}
84	gethostname(hostname, sizeof (hostname));
85	my_machine_name = hostname;
86	/* check for, and strip out, the machine name of the target */
87	names = strdup(argv[1]);
88	if (names == NULL)
89		errx(1, "out of memory");
90	for (cp = names; *cp && !strchr("@:!.", *cp); cp++)
91		;
92	if (*cp == '\0') {
93		/* this is a local to local talk */
94		his_name = names;
95		his_machine_name = my_machine_name;
96	} else {
97		if (*cp++ == '@') {
98			/* user@host */
99			his_name = names;
100			his_machine_name = cp;
101		} else {
102			/* host.user or host!user or host:user */
103			his_name = cp;
104			his_machine_name = names;
105		}
106		*--cp = '\0';
107	}
108	if (argc > 2)
109		his_tty = argv[2];	/* tty name is arg 2 */
110	else
111		his_tty = "";
112	get_addrs(my_machine_name, his_machine_name);
113	/*
114	 * Initialize the message template.
115	 */
116	msg.vers = TALK_VERSION;
117	msg.addr.sa_family = htons(AF_INET);
118	msg.ctl_addr.sa_family = htons(AF_INET);
119	msg.id_num = htonl(0);
120	strncpy(msg.l_name, my_name, NAME_SIZE);
121	msg.l_name[NAME_SIZE - 1] = '\0';
122	strncpy(msg.r_name, his_name, NAME_SIZE);
123	msg.r_name[NAME_SIZE - 1] = '\0';
124	strncpy(msg.r_tty, his_tty, TTY_SIZE);
125	msg.r_tty[TTY_SIZE - 1] = '\0';
126	free(names);
127}
128