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 1997 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30 /*
31 * University Copyright- Copyright (c) 1982, 1986, 1988
32 * The Regents of the University of California
33 * All Rights Reserved
34 *
35 * University Acknowledgment- Portions of this document are derived from
36 * software developed by the University of California, Berkeley, and its
37 * contributors.
38 */
39
40 #pragma ident "%Z%%M% %I% %E% SMI"
41
42 #include "talk.h"
43 #include "ctl.h"
44 #include <locale.h>
45 #include <pwd.h>
46 #include <sys/systeminfo.h>
47
48 char *getlogin(), *ttyname(int);
49
50 extern CTL_MSG msg;
51
52 /*
53 * Determine the local and remote user, tty, and machines
54 */
55
56 struct hostent *gethostbyname();
57
58 void
get_names(argc,argv)59 get_names(argc, argv)
60 int argc;
61 char *argv[];
62 {
63 char hostname[HOST_NAME_LENGTH + 1];
64 char *rem_name;
65 char *my_name;
66 char *my_machine_name;
67 char *rem_machine_name;
68 char *my_tty;
69 char *rem_tty;
70 char *ptr;
71 int name_length;
72
73 if (argc < 2) {
74 fprintf(stderr,
75 "Usage: talk %s\n", gettext("address [terminal]"));
76 exit(1);
77 }
78 if (!isatty(0)) {
79 fprintf(stderr,
80 gettext("Standard input must be a tty, not a pipe or a file\n"));
81 exit(1);
82 }
83
84 if (!isatty(1)) {
85 fprintf(stderr,
86 gettext("Standard output must be a tty, not a pipe or a file\n"));
87 exit(1);
88 }
89
90 if ((my_name = getlogin()) == NULL) {
91 struct passwd *pass = getpwuid(getuid());
92 if (pass != NULL)
93 my_name = pass->pw_name;
94 }
95 if (my_name == NULL) {
96 fprintf(stderr,
97 gettext("Who are you? You have no entry in /etc/utmp! Aborting..\n"));
98 exit(1);
99 }
100
101 name_length = HOST_NAME_LENGTH;
102 (void) sysinfo(SI_HOSTNAME, hostname, name_length);
103 my_machine_name = hostname;
104
105 my_tty = strrchr(ttyname(0), '/') + 1;
106
107 /*
108 * check for, and strip out, the machine name of the target
109 */
110
111 for (ptr = argv[1]; *ptr != '\0' &&
112 *ptr != '@' &&
113 *ptr != ':' &&
114 *ptr != '!' &&
115 *ptr != '.'; ptr++) {
116 }
117
118 if (*ptr == '\0') {
119
120 /* this is a local to local talk */
121
122 rem_name = argv[1];
123 rem_machine_name = my_machine_name;
124
125 } else {
126
127 if (*ptr == '@') {
128 /* user@host */
129 rem_name = argv[1];
130 rem_machine_name = ptr + 1;
131 } else {
132 /* host.user or host!user or host:user */
133 rem_name = ptr + 1;
134 rem_machine_name = argv[1];
135 }
136 *ptr = '\0';
137 }
138
139
140 if (argc > 2) {
141 rem_tty = argv[2]; /* tty name is arg 2 */
142 } else {
143 rem_tty = "";
144 }
145
146 get_addrs(my_machine_name, rem_machine_name);
147
148 /* Load these useful values into the standard message header */
149
150 msg.id_num = 0;
151
152 strncpy(msg.l_name, my_name, NAME_SIZE);
153 msg.l_name[NAME_SIZE - 1] = '\0';
154
155 strncpy(msg.r_name, rem_name, NAME_SIZE);
156 msg.r_name[NAME_SIZE - 1] = '\0';
157
158 strncpy(msg.r_tty, rem_tty, TTY_SIZE);
159 msg.r_tty[TTY_SIZE - 1] = '\0';
160 }
161