2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
34 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
39 static const char sccsid[] = "@(#)get_names.c 8.1 (Berkeley) 6/6/93";
42 #include <sys/param.h>
56 fprintf(stderr, "usage: talk person [ttyname]\n");
61 * Determine the local and remote user, tty, and machines
64 get_names(int argc, char *argv[])
66 char hostname[MAXHOSTNAMELEN];
67 char *his_name, *my_name;
68 const char *my_machine_name, *his_machine_name;
75 errx(1, "standard input must be a tty, not a pipe or a file");
76 if ((my_name = getlogin()) == NULL) {
79 if ((pw = getpwuid(getuid())) == NULL)
80 errx(1, "you don't exist. Go away");
81 my_name = pw->pw_name;
83 gethostname(hostname, sizeof (hostname));
84 my_machine_name = hostname;
85 /* check for, and strip out, the machine name of the target */
86 for (cp = argv[1]; *cp && !index("@:!", *cp); cp++)
89 /* this is a local to local talk */
91 my_machine_name = his_machine_name = "localhost";
96 his_machine_name = cp;
98 /* host!user or host:user */
100 his_machine_name = argv[1];
105 his_tty = argv[2]; /* tty name is arg 2 */
108 get_addrs(my_machine_name, his_machine_name);
110 * Initialize the message template.
112 msg.vers = TALK_VERSION;
113 msg.addr.sa_family = htons(AF_INET);
114 msg.ctl_addr.sa_family = htons(AF_INET);
115 msg.id_num = htonl(0);
116 strlcpy(msg.l_name, my_name, NAME_SIZE);
117 strlcpy(msg.r_name, his_name, NAME_SIZE);
118 strlcpy(msg.r_tty, his_tty, TTY_SIZE);