| /* |
| * Copyright (c) 1987, 1993 |
| * The Regents of the University of California. All rights reserved. |
| * (c) UNIX System Laboratories, Inc. |
| * All or some portions of this file are derived from material licensed |
| * to the University of California by American Telephone and Telegraph |
| * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
| * the permission of UNIX System Laboratories, Inc. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. All advertising materials mentioning features or use of this software |
| * must display the following acknowledgement: |
| * This product includes software developed by the University of |
| * California, Berkeley and its contributors. |
| * 4. Neither the name of the University nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * Modified Fri Mar 10 20:27:19 1995, faith@cs.unc.edu, for Linux |
| * Modified Mon Jul 1 18:14:10 1996, janl@ifi.uio.no, writing to stdout |
| * as suggested by Michael Meskes <meskes@Informatik.RWTH-Aachen.DE> |
| * |
| * 1999-02-22 Arkadiusz MiĆkiewicz <misiek@pld.ORG.PL> |
| * - added Native Language Support |
| * |
| * 2010-12-01 Marek Polacek <mmpolacek@gmail.com> |
| * - cleanups |
| */ |
| |
| #include <errno.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <getopt.h> |
| |
| #include "closestream.h" |
| #include "nls.h" |
| #include "c.h" |
| #include "rpmatch.h" |
| |
| /* exit codes */ |
| |
| #define IS_ALLOWED 0 /* Receiving messages is allowed. */ |
| #define IS_NOT_ALLOWED 1 /* Receiving messages is not allowed. */ |
| #define MESG_EXIT_FAILURE 2 /* An error occurred. */ |
| |
| static void __attribute__ ((__noreturn__)) usage(FILE * out) |
| { |
| fputs(USAGE_HEADER, out); |
| /* TRANSLATORS: this program uses for y and n rpmatch(3), |
| * which means they can be translated. */ |
| fprintf(out, |
| _(" %s [options] [y | n]\n"), program_invocation_short_name); |
| |
| fputs(USAGE_SEPARATOR, out); |
| fputs(_("Control write access of other users to your terminal.\n"), out); |
| |
| fputs(USAGE_OPTIONS, out); |
| fputs(_(" -v, --verbose explain what is being done\n"), out); |
| fputs(USAGE_HELP, out); |
| fputs(USAGE_VERSION, out); |
| fprintf(out, USAGE_MAN_TAIL("mesg(1)")); |
| |
| exit(out == stderr ? MESG_EXIT_FAILURE : EXIT_SUCCESS); |
| } |
| |
| int main(int argc, char *argv[]) |
| { |
| struct stat sb; |
| char *tty; |
| int ch, fd, verbose = FALSE, ret; |
| |
| static const struct option longopts[] = { |
| { "verbose", no_argument, NULL, 'v' }, |
| { "version", no_argument, NULL, 'V' }, |
| { "help", no_argument, NULL, 'h' }, |
| { NULL, 0, NULL, 0 } |
| }; |
| |
| setlocale(LC_ALL, ""); |
| bindtextdomain(PACKAGE, LOCALEDIR); |
| textdomain(PACKAGE); |
| atexit(close_stdout); |
| |
| while ((ch = getopt_long(argc, argv, "vVh", longopts, NULL)) != -1) |
| switch (ch) { |
| case 'v': |
| verbose = TRUE; |
| break; |
| case 'V': |
| printf(UTIL_LINUX_VERSION); |
| exit(EXIT_SUCCESS); |
| case 'h': |
| usage(stdout); |
| default: |
| errtryhelp(EXIT_FAILURE); |
| } |
| |
| argc -= optind; |
| argv += optind; |
| |
| if ((tty = ttyname(STDERR_FILENO)) == NULL) |
| err(MESG_EXIT_FAILURE, _("ttyname failed")); |
| if ((fd = open(tty, O_RDONLY)) < 0) |
| err(MESG_EXIT_FAILURE, _("cannot open %s"), tty); |
| if (fstat(fd, &sb)) |
| err(MESG_EXIT_FAILURE, _("stat of %s failed"), tty); |
| |
| if (!*argv) { |
| close(fd); |
| if (sb.st_mode & (S_IWGRP | S_IWOTH)) { |
| puts(_("is y")); |
| return IS_ALLOWED; |
| } |
| puts(_("is n")); |
| return IS_NOT_ALLOWED; |
| } |
| |
| switch (rpmatch(argv[0])) { |
| case RPMATCH_YES: |
| #ifdef USE_TTY_GROUP |
| if (fchmod(fd, sb.st_mode | S_IWGRP) < 0) |
| #else |
| if (fchmod(fd, sb.st_mode | S_IWGRP | S_IWOTH) < 0) |
| #endif |
| err(MESG_EXIT_FAILURE, _("change %s mode failed"), tty); |
| if (verbose) |
| puts(_("write access to your terminal is allowed")); |
| ret = IS_ALLOWED; |
| break; |
| case RPMATCH_NO: |
| if (fchmod(fd, sb.st_mode & ~(S_IWGRP|S_IWOTH)) < 0) |
| err(MESG_EXIT_FAILURE, _("change %s mode failed"), tty); |
| if (verbose) |
| puts(_("write access to your terminal is denied")); |
| ret = IS_NOT_ALLOWED; |
| break; |
| case RPMATCH_INVALID: |
| warnx(_("invalid argument: %s"), argv[0]); |
| usage(stderr); |
| default: |
| abort(); |
| } |
| close(fd); |
| return ret; |
| } |