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6dbe3af9 | 1 | /* |
726f69e2 KZ |
2 | * Copyright (c) 1987, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
4 | * (c) UNIX System Laboratories, Inc. | |
5 | * All or some portions of this file are derived from material licensed | |
6 | * to the University of California by American Telephone and Telegraph | |
7 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with | |
8 | * the permission of UNIX System Laboratories, Inc. | |
6dbe3af9 | 9 | * |
726f69e2 KZ |
10 | * Redistribution and use in source and binary forms, with or without |
11 | * modification, are permitted provided that the following conditions | |
12 | * are met: | |
13 | * 1. Redistributions of source code must retain the above copyright | |
14 | * notice, this list of conditions and the following disclaimer. | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in the | |
17 | * documentation and/or other materials provided with the distribution. | |
18 | * 3. All advertising materials mentioning features or use of this software | |
19 | * must display the following acknowledgement: | |
20 | * This product includes software developed by the University of | |
21 | * California, Berkeley and its contributors. | |
22 | * 4. Neither the name of the University nor the names of its contributors | |
23 | * may be used to endorse or promote products derived from this software | |
24 | * without specific prior written permission. | |
25 | * | |
26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
36 | * SUCH DAMAGE. | |
37 | * | |
38 | * Modified Fri Mar 10 20:27:19 1995, faith@cs.unc.edu, for Linux | |
fd6b7a7f KZ |
39 | * Modified Mon Jul 1 18:14:10 1996, janl@ifi.uio.no, writing to stdout |
40 | * as suggested by Michael Meskes <meskes@Informatik.RWTH-Aachen.DE> | |
7eda085c | 41 | * |
b50945d4 | 42 | * 1999-02-22 Arkadiusz MiĆkiewicz <misiek@pld.ORG.PL> |
7eda085c KZ |
43 | * - added Native Language Support |
44 | * | |
1a68fc8a MP |
45 | * 2010-12-01 Marek Polacek <mmpolacek@gmail.com> |
46 | * - cleanups | |
6dbe3af9 | 47 | */ |
726f69e2 | 48 | |
6dbe3af9 | 49 | #include <errno.h> |
726f69e2 KZ |
50 | #include <stdio.h> |
51 | #include <stdlib.h> | |
52 | #include <string.h> | |
6dbe3af9 | 53 | #include <unistd.h> |
1a68fc8a MP |
54 | #include <sys/types.h> |
55 | #include <sys/stat.h> | |
fe16e125 | 56 | #include <getopt.h> |
cdd2a8c3 SK |
57 | |
58 | #include "closestream.h" | |
7eda085c | 59 | #include "nls.h" |
eb76ca98 | 60 | #include "c.h" |
51924a4e | 61 | #include "rpmatch.h" |
6dbe3af9 | 62 | |
5eae5930 FC |
63 | /* exit codes */ |
64 | ||
65 | #define IS_ALLOWED 0 /* Receiving messages is allowed. */ | |
66 | #define IS_NOT_ALLOWED 1 /* Receiving messages is not allowed. */ | |
67 | #define MESG_EXIT_FAILURE 2 /* An error occurred. */ | |
68 | ||
6e1eda6f | 69 | static void __attribute__((__noreturn__)) usage(void) |
fe16e125 | 70 | { |
6e1eda6f | 71 | FILE *out = stdout; |
1e6f6cdb | 72 | fputs(USAGE_HEADER, out); |
041b8ab2 SK |
73 | /* TRANSLATORS: this program uses for y and n rpmatch(3), |
74 | * which means they can be translated. */ | |
fe16e125 | 75 | fprintf(out, |
2960a4a3 | 76 | _(" %s [options] [y | n]\n"), program_invocation_short_name); |
451dbcfa BS |
77 | |
78 | fputs(USAGE_SEPARATOR, out); | |
79 | fputs(_("Control write access of other users to your terminal.\n"), out); | |
80 | ||
1e6f6cdb SK |
81 | fputs(USAGE_OPTIONS, out); |
82 | fputs(_(" -v, --verbose explain what is being done\n"), out); | |
83 | fputs(USAGE_HELP, out); | |
84 | fputs(USAGE_VERSION, out); | |
85 | fprintf(out, USAGE_MAN_TAIL("mesg(1)")); | |
fe16e125 | 86 | |
6e1eda6f | 87 | exit(EXIT_SUCCESS); |
fe16e125 SK |
88 | } |
89 | ||
1a68fc8a | 90 | int main(int argc, char *argv[]) |
6dbe3af9 | 91 | { |
726f69e2 KZ |
92 | struct stat sb; |
93 | char *tty; | |
010d5a67 | 94 | int ch, fd, verbose = FALSE, ret; |
726f69e2 | 95 | |
fe16e125 | 96 | static const struct option longopts[] = { |
87918040 SK |
97 | { "verbose", no_argument, NULL, 'v' }, |
98 | { "version", no_argument, NULL, 'V' }, | |
99 | { "help", no_argument, NULL, 'h' }, | |
100 | { NULL, 0, NULL, 0 } | |
fe16e125 SK |
101 | }; |
102 | ||
5d324c6b SK |
103 | setlocale(LC_ALL, ""); |
104 | bindtextdomain(PACKAGE, LOCALEDIR); | |
105 | textdomain(PACKAGE); | |
106 | atexit(close_stdout); | |
107 | ||
849c6ea3 | 108 | while ((ch = getopt_long(argc, argv, "vVh", longopts, NULL)) != -1) |
726f69e2 | 109 | switch (ch) { |
849c6ea3 SK |
110 | case 'v': |
111 | verbose = TRUE; | |
112 | break; | |
fe16e125 | 113 | case 'V': |
1e6f6cdb | 114 | printf(UTIL_LINUX_VERSION); |
fe16e125 SK |
115 | exit(EXIT_SUCCESS); |
116 | case 'h': | |
6e1eda6f | 117 | usage(); |
726f69e2 | 118 | default: |
677ec86c | 119 | errtryhelp(EXIT_FAILURE); |
726f69e2 | 120 | } |
1a68fc8a | 121 | |
726f69e2 KZ |
122 | argc -= optind; |
123 | argv += optind; | |
124 | ||
125 | if ((tty = ttyname(STDERR_FILENO)) == NULL) | |
5eae5930 | 126 | err(MESG_EXIT_FAILURE, _("ttyname failed")); |
010d5a67 SK |
127 | if ((fd = open(tty, O_RDONLY)) < 0) |
128 | err(MESG_EXIT_FAILURE, _("cannot open %s"), tty); | |
129 | if (fstat(fd, &sb)) | |
fc14ceba | 130 | err(MESG_EXIT_FAILURE, _("stat of %s failed"), tty); |
726f69e2 | 131 | |
1a68fc8a | 132 | if (!*argv) { |
010d5a67 | 133 | close(fd); |
726f69e2 | 134 | if (sb.st_mode & (S_IWGRP | S_IWOTH)) { |
1a68fc8a | 135 | puts(_("is y")); |
5eae5930 | 136 | return IS_ALLOWED; |
726f69e2 | 137 | } |
1a68fc8a | 138 | puts(_("is n")); |
5eae5930 | 139 | return IS_NOT_ALLOWED; |
726f69e2 KZ |
140 | } |
141 | ||
041b8ab2 | 142 | switch (rpmatch(argv[0])) { |
cd2a6f1c | 143 | case RPMATCH_YES: |
726f69e2 | 144 | #ifdef USE_TTY_GROUP |
010d5a67 | 145 | if (fchmod(fd, sb.st_mode | S_IWGRP) < 0) |
726f69e2 | 146 | #else |
010d5a67 | 147 | if (fchmod(fd, sb.st_mode | S_IWGRP | S_IWOTH) < 0) |
726f69e2 | 148 | #endif |
5eae5930 | 149 | err(MESG_EXIT_FAILURE, _("change %s mode failed"), tty); |
849c6ea3 SK |
150 | if (verbose) |
151 | puts(_("write access to your terminal is allowed")); | |
010d5a67 SK |
152 | ret = IS_ALLOWED; |
153 | break; | |
cd2a6f1c | 154 | case RPMATCH_NO: |
010d5a67 | 155 | if (fchmod(fd, sb.st_mode & ~(S_IWGRP|S_IWOTH)) < 0) |
5eae5930 | 156 | err(MESG_EXIT_FAILURE, _("change %s mode failed"), tty); |
849c6ea3 SK |
157 | if (verbose) |
158 | puts(_("write access to your terminal is denied")); | |
010d5a67 SK |
159 | ret = IS_NOT_ALLOWED; |
160 | break; | |
cd2a6f1c | 161 | case RPMATCH_INVALID: |
041b8ab2 | 162 | warnx(_("invalid argument: %s"), argv[0]); |
6e1eda6f | 163 | errtryhelp(EXIT_FAILURE); |
041b8ab2 SK |
164 | default: |
165 | abort(); | |
726f69e2 | 166 | } |
010d5a67 SK |
167 | close(fd); |
168 | return ret; | |
6dbe3af9 | 169 | } |