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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
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
30 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
35 static const char sccsid[] = "@(#)get_names.c 8.1 (Berkeley) 6/6/93";
38 #include <sys/param.h>
53 fprintf(stderr, "usage: talk person [ttyname]\n");
58 * Determine the local and remote user, tty, and machines
61 get_names(int argc, char *argv[])
63 char hostname[MAXHOSTNAMELEN];
64 char *his_name, *my_name;
65 const char *my_machine_name, *his_machine_name;
72 errx(1, "standard input must be a tty, not a pipe or a file");
73 if ((my_name = getlogin()) == NULL) {
76 if ((pw = getpwuid(getuid())) == NULL)
77 errx(1, "you don't exist. Go away");
78 my_name = pw->pw_name;
80 gethostname(hostname, sizeof (hostname));
81 my_machine_name = hostname;
82 /* check for, and strip out, the machine name of the target */
83 cp = argv[1] + strcspn(argv[1], "@:!");
85 /* this is a local to local talk */
87 my_machine_name = his_machine_name = "localhost";
92 his_machine_name = cp;
94 /* host!user or host:user */
96 his_machine_name = argv[1];
101 his_tty = argv[2]; /* tty name is arg 2 */
104 get_addrs(my_machine_name, his_machine_name);
106 * Initialize the message template.
108 msg.vers = TALK_VERSION;
109 msg.addr.sa_family = htons(AF_INET);
110 msg.ctl_addr.sa_family = htons(AF_INET);
111 msg.id_num = htonl(0);
112 strlcpy(msg.l_name, my_name, NAME_SIZE);
113 strlcpy(msg.r_name, his_name, NAME_SIZE);
114 strlcpy(msg.r_tty, his_tty, TTY_SIZE);