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Annotation of src/usr.bin/mesg/mesg.c, Revision 1.17

1.17    ! beck        1: /*     $OpenBSD: mesg.c,v 1.16 2019/06/28 13:35:02 deraadt Exp $       */
1.1       deraadt     2: /*     $NetBSD: mesg.c,v 1.4 1994/12/23 07:16:32 jtc Exp $     */
                      3:
                      4: /*
                      5:  * Copyright (c) 1987, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  * (c) UNIX System Laboratories, Inc.
                      8:  * All or some portions of this file are derived from material licensed
                      9:  * to the University of California by American Telephone and Telegraph
                     10:  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
                     11:  * the permission of UNIX System Laboratories, Inc.
                     12:  *
                     13:  * Redistribution and use in source and binary forms, with or without
                     14:  * modification, are permitted provided that the following conditions
                     15:  * are met:
                     16:  * 1. Redistributions of source code must retain the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer.
                     18:  * 2. Redistributions in binary form must reproduce the above copyright
                     19:  *    notice, this list of conditions and the following disclaimer in the
                     20:  *    documentation and/or other materials provided with the distribution.
1.5       millert    21:  * 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    22:  *    may be used to endorse or promote products derived from this software
                     23:  *    without specific prior written permission.
                     24:  *
                     25:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     26:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     27:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     28:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     29:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     30:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     31:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     32:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     33:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     34:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     35:  * SUCH DAMAGE.
                     36:  */
                     37:
                     38: #include <sys/types.h>
                     39: #include <sys/stat.h>
                     40:
                     41: #include <err.h>
                     42: #include <errno.h>
                     43: #include <stdio.h>
                     44: #include <stdlib.h>
                     45: #include <string.h>
                     46: #include <unistd.h>
                     47:
                     48: int
1.6       deraadt    49: main(int argc, char *argv[])
1.1       deraadt    50: {
                     51:        struct stat sb;
                     52:        char *tty;
                     53:        int ch;
1.9       deraadt    54:
1.3       millert    55:        while ((ch = getopt(argc, argv, "")) != -1)
1.1       deraadt    56:                switch (ch) {
                     57:                case '?':
                     58:                default:
                     59:                        goto usage;
                     60:                }
                     61:        argc -= optind;
                     62:        argv += optind;
                     63:
                     64:        if ((tty = ttyname(STDERR_FILENO)) == NULL)
1.4       flipk      65:                err(2, "ttyname");
1.13      deraadt    66:
                     67:        if (unveil(tty, "rw") == -1)
1.17    ! beck       68:                err(2, "unveil %s", tty);
1.13      deraadt    69:        if (pledge("stdio rpath fattr", NULL) == -1)
1.15      mestre     70:                err(2, "pledge");
1.13      deraadt    71:
1.16      deraadt    72:        if (stat(tty, &sb) == -1)
1.4       flipk      73:                err(2, "%s", tty);
1.12      semarie    74:
                     75:        sb.st_mode &= ACCESSPERMS;
1.1       deraadt    76:
                     77:        if (*argv == NULL) {
                     78:                if (sb.st_mode & S_IWGRP) {
                     79:                        (void)fprintf(stderr, "is y\n");
                     80:                        exit(0);
                     81:                }
                     82:                (void)fprintf(stderr, "is n\n");
                     83:                exit(1);
                     84:        }
                     85:
                     86:        switch (*argv[0]) {
                     87:        case 'y':
1.16      deraadt    88:                if (chmod(tty, sb.st_mode | S_IWGRP) == -1)
1.4       flipk      89:                        err(2, "%s", tty);
1.1       deraadt    90:                exit(0);
                     91:        case 'n':
1.16      deraadt    92:                if (chmod(tty, sb.st_mode & ~S_IWGRP) == -1)
1.4       flipk      93:                        err(2, "%s", tty);
1.1       deraadt    94:                exit(1);
                     95:        }
                     96:
1.7       jmc        97: usage: (void)fprintf(stderr, "usage: mesg [n | y]\n");
1.1       deraadt    98:        exit(2);
                     99: }