xref: /freebsd/usr.bin/talk/get_names.c (revision fbbd9655e5107c68e4e0146ff22b73d7350475bc)
19b50d902SRodney W. Grimes /*
29b50d902SRodney W. Grimes  * Copyright (c) 1983, 1993
39b50d902SRodney W. Grimes  *	The Regents of the University of California.  All rights reserved.
49b50d902SRodney W. Grimes  *
59b50d902SRodney W. Grimes  * Redistribution and use in source and binary forms, with or without
69b50d902SRodney W. Grimes  * modification, are permitted provided that the following conditions
79b50d902SRodney W. Grimes  * are met:
89b50d902SRodney W. Grimes  * 1. Redistributions of source code must retain the above copyright
99b50d902SRodney W. Grimes  *    notice, this list of conditions and the following disclaimer.
109b50d902SRodney W. Grimes  * 2. Redistributions in binary form must reproduce the above copyright
119b50d902SRodney W. Grimes  *    notice, this list of conditions and the following disclaimer in the
129b50d902SRodney W. Grimes  *    documentation and/or other materials provided with the distribution.
13*fbbd9655SWarner Losh  * 3. Neither the name of the University nor the names of its contributors
149b50d902SRodney W. Grimes  *    may be used to endorse or promote products derived from this software
159b50d902SRodney W. Grimes  *    without specific prior written permission.
169b50d902SRodney W. Grimes  *
179b50d902SRodney W. Grimes  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
189b50d902SRodney W. Grimes  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
199b50d902SRodney W. Grimes  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
209b50d902SRodney W. Grimes  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
219b50d902SRodney W. Grimes  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
229b50d902SRodney W. Grimes  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
239b50d902SRodney W. Grimes  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
249b50d902SRodney W. Grimes  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
259b50d902SRodney W. Grimes  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
269b50d902SRodney W. Grimes  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
279b50d902SRodney W. Grimes  * SUCH DAMAGE.
289b50d902SRodney W. Grimes  */
299b50d902SRodney W. Grimes 
30caa64801SMark Murray #include <sys/cdefs.h>
31caa64801SMark Murray 
32caa64801SMark Murray __FBSDID("$FreeBSD$");
33caa64801SMark Murray 
349b50d902SRodney W. Grimes #ifndef lint
35caa64801SMark Murray static const char sccsid[] = "@(#)get_names.c	8.1 (Berkeley) 6/6/93";
3620868061SPhilippe Charnier #endif
37caa64801SMark Murray 
38caa64801SMark Murray #include <sys/param.h>
399b50d902SRodney W. Grimes 
4020868061SPhilippe Charnier #include <err.h>
4120868061SPhilippe Charnier #include <pwd.h>
429582ea7eSDima Dorfman #include <stdlib.h>
4328592604SJoerg Wunsch #include <string.h>
443daadfc8SXin LI #include <unistd.h>
45caa64801SMark Murray 
469b50d902SRodney W. Grimes #include "talk.h"
479b50d902SRodney W. Grimes 
489b50d902SRodney W. Grimes extern	CTL_MSG msg;
499b50d902SRodney W. Grimes 
5020868061SPhilippe Charnier static void
5120868061SPhilippe Charnier usage(void)
5220868061SPhilippe Charnier {
5320868061SPhilippe Charnier 	fprintf(stderr, "usage: talk person [ttyname]\n");
5420868061SPhilippe Charnier 	exit(1);
5520868061SPhilippe Charnier }
5620868061SPhilippe Charnier 
579b50d902SRodney W. Grimes /*
589b50d902SRodney W. Grimes  * Determine the local and remote user, tty, and machines
599b50d902SRodney W. Grimes  */
6028592604SJoerg Wunsch void
61b6d9e1f3SXin LI get_names(int argc, char *argv[])
629b50d902SRodney W. Grimes {
639b50d902SRodney W. Grimes 	char hostname[MAXHOSTNAMELEN];
649b50d902SRodney W. Grimes 	char *his_name, *my_name;
65b6d9e1f3SXin LI 	const char *my_machine_name, *his_machine_name;
66caa64801SMark Murray 	const char *his_tty;
67caa64801SMark Murray 	char *cp;
689b50d902SRodney W. Grimes 
6920868061SPhilippe Charnier 	if (argc < 2 )
7020868061SPhilippe Charnier 		usage();
7120868061SPhilippe Charnier 	if (!isatty(0))
7220868061SPhilippe Charnier 		errx(1, "standard input must be a tty, not a pipe or a file");
739b50d902SRodney W. Grimes 	if ((my_name = getlogin()) == NULL) {
749b50d902SRodney W. Grimes 		struct passwd *pw;
759b50d902SRodney W. Grimes 
7620868061SPhilippe Charnier 		if ((pw = getpwuid(getuid())) == NULL)
7720868061SPhilippe Charnier 			errx(1, "you don't exist. Go away");
789b50d902SRodney W. Grimes 		my_name = pw->pw_name;
799b50d902SRodney W. Grimes 	}
809b50d902SRodney W. Grimes 	gethostname(hostname, sizeof (hostname));
819b50d902SRodney W. Grimes 	my_machine_name = hostname;
829b50d902SRodney W. Grimes 	/* check for, and strip out, the machine name of the target */
8375ac3edfSEd Schouten 	cp = argv[1] + strcspn(argv[1], "@:!");
849b50d902SRodney W. Grimes 	if (*cp == '\0') {
859b50d902SRodney W. Grimes 		/* this is a local to local talk */
869b50d902SRodney W. Grimes 		his_name = argv[1];
879d61853dSBruce M Simpson 		my_machine_name = his_machine_name = "localhost";
889b50d902SRodney W. Grimes 	} else {
89c6189102SAndrey A. Chernov 		if (*cp++ == '@') {
909b50d902SRodney W. Grimes 			/* user@host */
919b50d902SRodney W. Grimes 			his_name = argv[1];
92c6189102SAndrey A. Chernov 			his_machine_name = cp;
93c6189102SAndrey A. Chernov 		} else {
94c6189102SAndrey A. Chernov 			/* host!user or host:user */
95c6189102SAndrey A. Chernov 			his_name = cp;
96c6189102SAndrey A. Chernov 			his_machine_name = argv[1];
97c6189102SAndrey A. Chernov 		}
98c6189102SAndrey A. Chernov 		*--cp = '\0';
999b50d902SRodney W. Grimes 	}
1009b50d902SRodney W. Grimes 	if (argc > 2)
1019b50d902SRodney W. Grimes 		his_tty = argv[2];	/* tty name is arg 2 */
1029b50d902SRodney W. Grimes 	else
1039b50d902SRodney W. Grimes 		his_tty = "";
1049b50d902SRodney W. Grimes 	get_addrs(my_machine_name, his_machine_name);
1059b50d902SRodney W. Grimes 	/*
1069b50d902SRodney W. Grimes 	 * Initialize the message template.
1079b50d902SRodney W. Grimes 	 */
1089b50d902SRodney W. Grimes 	msg.vers = TALK_VERSION;
1099b50d902SRodney W. Grimes 	msg.addr.sa_family = htons(AF_INET);
1109b50d902SRodney W. Grimes 	msg.ctl_addr.sa_family = htons(AF_INET);
1119b50d902SRodney W. Grimes 	msg.id_num = htonl(0);
1121c8ee5f2SXin LI 	strlcpy(msg.l_name, my_name, NAME_SIZE);
1131c8ee5f2SXin LI 	strlcpy(msg.r_name, his_name, NAME_SIZE);
1141c8ee5f2SXin LI 	strlcpy(msg.r_tty, his_tty, TTY_SIZE);
1159b50d902SRodney W. Grimes }
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