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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-14 19:10:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-14 19:10:49 +0000
commitcfe5e3905201349e9cf3f95d52ff4bd100bde37d (patch)
treed0baf160cbee3195249d095f85e52d20c21acf02 /term-utils/mesg.c
parentInitial commit. (diff)
downloadutil-linux-cfe5e3905201349e9cf3f95d52ff4bd100bde37d.tar.xz
util-linux-cfe5e3905201349e9cf3f95d52ff4bd100bde37d.zip
Adding upstream version 2.39.3.upstream/2.39.3
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'term-utils/mesg.c')
-rw-r--r--term-utils/mesg.c185
1 files changed, 185 insertions, 0 deletions
diff --git a/term-utils/mesg.c b/term-utils/mesg.c
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+/*
+ * 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 Miƛkiewicz <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"
+#include "ttyutils.h"
+#include "pathnames.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(void)
+{
+ FILE *out = stdout;
+ 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);
+ printf(USAGE_HELP_OPTIONS(16));
+ printf(USAGE_MAN_TAIL("mesg(1)"));
+
+ exit(EXIT_SUCCESS);
+}
+
+int main(int argc, char *argv[])
+{
+ struct stat sb;
+ char *tty;
+ char ttybuf[sizeof(_PATH_PROC_FDDIR) + sizeof(stringify_value(INT_MAX))];
+ 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);
+ close_stdout_atexit();
+
+ while ((ch = getopt_long(argc, argv, "vVh", longopts, NULL)) != -1)
+ switch (ch) {
+ case 'v':
+ verbose = TRUE;
+ break;
+
+ case 'V':
+ print_version(EXIT_SUCCESS);
+ case 'h':
+ usage();
+ default:
+ errtryhelp(EXIT_FAILURE);
+ }
+
+ argc -= optind;
+ argv += optind;
+
+ fd = get_terminal_stdfd();
+ if (fd < 0) {
+ if (verbose)
+ warnx(_("no tty"));
+ exit(MESG_EXIT_FAILURE);
+ }
+
+ tty = ttyname(fd);
+ if (!tty) {
+ snprintf(ttybuf, sizeof(ttybuf), "%s/%d", _PATH_PROC_FDDIR, fd);
+ tty = ttybuf;
+ if (verbose)
+ warnx(_("ttyname() failed, attempting to go around using: %s"), tty);
+ }
+
+ if (!*argv) {
+ if (stat(tty, &sb))
+ err(MESG_EXIT_FAILURE, _("stat of %s failed"), tty);
+ if (sb.st_mode & (S_IWGRP | S_IWOTH)) {
+ puts(_("is y"));
+ return IS_ALLOWED;
+ }
+ puts(_("is n"));
+ return IS_NOT_ALLOWED;
+ }
+
+ 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);
+
+ 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]);
+ errtryhelp(EXIT_FAILURE);
+ default:
+ abort();
+ }
+ close(fd);
+ return ret;
+}