1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 2017 Gary Mills
24 * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
25 * Use is subject to license terms.
26 */
27
28/*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
29/*	  All Rights Reserved  	*/
30
31/*
32 * University Copyright- Copyright (c) 1982, 1986, 1988
33 * The Regents of the University of California
34 * All Rights Reserved
35 *
36 * University Acknowledgment- Portions of this document are derived from
37 * software developed by the University of California, Berkeley, and its
38 * contributors.
39 */
40
41#include "talk.h"
42#include "ctl.h"
43#include <locale.h>
44#include <pwd.h>
45#include <sys/systeminfo.h>
46
47char *getlogin(), *ttyname(int);
48
49extern CTL_MSG msg;
50
51/*
52 * Determine the local and remote user, tty, and machines
53 */
54
55struct hostent *gethostbyname();
56
57void
58get_names(argc, argv)
59int argc;
60char *argv[];
61{
62	char hostname[HOST_NAME_LENGTH + 1];
63	char *rem_name;
64	char *my_name;
65	char *my_machine_name;
66	char *rem_machine_name;
67	char *rem_tty;
68	char *ptr;
69	int name_length;
70
71	if (argc < 2) {
72		fprintf(stderr,
73		    "Usage: talk %s\n", gettext("address [terminal]"));
74		exit(1);
75	}
76	if (!isatty(0)) {
77		fprintf(stderr,
78	gettext("Standard input must be a tty, not a pipe or a file\n"));
79		exit(1);
80	}
81
82	if (!isatty(1)) {
83		fprintf(stderr,
84	gettext("Standard output must be a tty, not a pipe or a file\n"));
85		exit(1);
86	}
87
88	if ((my_name = getlogin()) == NULL) {
89	struct passwd *pass = getpwuid(getuid());
90	if (pass != NULL)
91		my_name = pass->pw_name;
92	}
93	if (my_name == NULL) {
94		fprintf(stderr,
95	gettext("Who are you?  You have no entry in /etc/utmp!  Aborting..\n"));
96		exit(1);
97	}
98
99	name_length = HOST_NAME_LENGTH;
100	(void) sysinfo(SI_HOSTNAME, hostname, name_length);
101	my_machine_name = hostname;
102
103	/*
104	 * check for, and strip out, the machine name of the target
105	 */
106
107	for (ptr = argv[1]; *ptr != '\0' &&
108			 *ptr != '@' &&
109			 *ptr != ':' &&
110			 *ptr != '!' &&
111			 *ptr != '.'; ptr++) {
112	}
113
114	if (*ptr == '\0') {
115
116		/* this is a local to local talk */
117
118	rem_name = argv[1];
119	rem_machine_name = my_machine_name;
120
121	} else {
122
123	if (*ptr == '@') {
124		/* user@host */
125		rem_name = argv[1];
126		rem_machine_name = ptr + 1;
127	} else {
128		/* host.user or host!user or host:user */
129		rem_name = ptr + 1;
130		rem_machine_name = argv[1];
131	}
132	*ptr = '\0';
133	}
134
135
136	if (argc > 2) {
137	rem_tty = argv[2];	/* tty name is arg 2 */
138	} else {
139	rem_tty = "";
140	}
141
142	get_addrs(my_machine_name, rem_machine_name);
143
144	/* Load these useful values into the standard message header */
145
146	msg.id_num = 0;
147
148	strncpy(msg.l_name, my_name, NAME_SIZE);
149	msg.l_name[NAME_SIZE - 1] = '\0';
150
151	strncpy(msg.r_name, rem_name, NAME_SIZE);
152	msg.r_name[NAME_SIZE - 1] = '\0';
153
154	strncpy(msg.r_tty, rem_tty, TTY_SIZE);
155	msg.r_tty[TTY_SIZE - 1] = '\0';
156}
157