/* $NetBSD: chmod.c,v 1.39 2023/05/05 04:14:02 kre Exp $ */

/*
 * Copyright (c) 1989, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * 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. 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.
 */

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT(
"@(#) Copyright (c) 1989, 1993, 1994\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)chmod.c     8.8 (Berkeley) 4/1/94";
#else
__RCSID("$NetBSD: chmod.c,v 1.39 2023/05/05 04:14:02 kre Exp $");
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/types.h>

#include <err.h>
#include <errno.h>
#include <fts.h>
#include <limits.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>

__dead static void      usage(void);

struct option chmod_longopts[] = {
        { "reference",          required_argument,      0,
                                                1 },
        { NULL,                 0,                      0,
                                                0 },
};

int
main(int argc, char *argv[])
{
        FTS *ftsp;
        FTSENT *p;
        void *set;
        mode_t mval, nval;
        int Hflag, Lflag, Rflag, ch, dflag, fflag, fts_options, hflag, rval;
        char *mode, *reference;
        int (*change_mode)(const char *, mode_t);

        setprogname(argv[0]);
        (void)setlocale(LC_ALL, "");

        Hflag = Lflag = Rflag = dflag = fflag = hflag = 0;
        reference = NULL;
        while ((ch = getopt_long(argc, argv, "HLPRXdfghorstuwx",
            chmod_longopts, NULL)) != -1)
                switch (ch) {
                case 1:
                        reference = optarg;
                        break;
                case 'H':
                        Hflag = 1;
                        Lflag = 0;
                        break;
                case 'L':
                        Lflag = 1;
                        Hflag = 0;
                        break;
                case 'P':
                        Hflag = Lflag = 0;
                        break;
                case 'R':
                        Rflag = 1;
                        break;
                case 'd':
                        dflag = 1;
                        break;
                case 'f':
                        fflag = 1;
                        break;
                case 'h':
                        /*
                         * In System V the -h option causes chmod to
                         * change the mode of the symbolic link.
                         * 4.4BSD's symbolic links didn't have modes,
                         * so it was an undocumented noop.  In NetBSD
                         * 1.3, lchmod(2) is introduced and this
                         * option does real work.
                         */
                        hflag = 1;
                        break;
                /*
                 * XXX
                 * "-[rwx]" are valid mode commands.  If they are the entire
                 * argument, getopt has moved past them, so decrement optind.
                 * Regardless, we're done argument processing.
                 */
                case 'g': case 'o': case 'r': case 's':
                case 't': case 'u': case 'w': case 'X': case 'x':
                        if (argv[optind - 1][0] == '-' &&
                            argv[optind - 1][1] == ch &&
                            argv[optind - 1][2] == '\0')
                                --optind;
                        goto done;
                case '?':
                default:
                        usage();
                }
done:   argv += optind;
        argc -= optind;

        if (argc == 0 || (argc == 1 && reference == NULL))
                usage();

        fts_options = FTS_PHYSICAL;
        if (Rflag) {
                if (hflag) {
                        errx(EXIT_FAILURE,
                "the -R and -h options may not be specified together.");
                        /* NOTREACHED */
                }
                if (Hflag)
                        fts_options |= FTS_COMFOLLOW;
                if (Lflag) {
                        fts_options &= ~FTS_PHYSICAL;
                        fts_options |= FTS_LOGICAL;
                }
        } else if (!hflag)
                fts_options |= FTS_COMFOLLOW;
        if (hflag)
                change_mode = lchmod;
        else
                change_mode = chmod;

        if (reference == NULL) {
                mode = *argv++;
                if ((set = setmode(mode)) == NULL) {
                        err(EXIT_FAILURE, "Cannot set file mode `%s'", mode);
                        /* NOTREACHED */
                }
                mval = 0;
        } else {
                struct stat st;

                if (stat(reference, &st) == -1)
                        err(EXIT_FAILURE, "Cannot stat `%s'", reference);
                mval = st.st_mode;
                set = NULL;
        }

        if ((ftsp = fts_open(argv, fts_options, 0)) == NULL) {
                err(EXIT_FAILURE, "fts_open");
                /* NOTREACHED */
        }
        for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
                switch (p->fts_info) {
                case FTS_D:
                        if (!Rflag)
                                (void)fts_set(ftsp, p, FTS_SKIP);
                        break;
                case FTS_DNR:                   /* Warn, chmod, continue. */
                        warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
                        rval = 1;
                        break;
                case FTS_DP:                    /* Already changed at FTS_D. */
                        continue;
                case FTS_ERR:                   /* Warn, continue. */
                case FTS_NS:
                        warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
                        rval = 1;
                        continue;
                case FTS_SL:                    /* Ignore. */
                case FTS_SLNONE:
                        /*
                         * The only symlinks that end up here are ones that
                         * don't point to anything and ones that we found
                         * doing a physical walk.
                         */
                        if (!hflag)
                                continue;
                        /* else */
                        /* FALLTHROUGH */
                default:
                        break;
                }
                nval = set ? getmode(set, p->fts_statp->st_mode) : mval;
                if (dflag && nval == p->fts_statp->st_mode)
                        continue;
                if ((*change_mode)(p->fts_accpath, nval) && !fflag) {
                        warn("%s", p->fts_path);
                        rval = 1;
                }
        }
        if (errno) {
                err(EXIT_FAILURE, "fts_read");
                /* NOTREACHED */
        }
        exit(rval);
        /* NOTREACHED */
}

static void
usage(void)
{
        (void)fprintf(stderr,
            "Usage: %s [-R [-H | -L | -P]] [-dfh] mode file ...\n"
            "\t%s [-R [-H | -L | -P]] [-dfh] --reference=rfile file ...\n",
            getprogname(), getprogname());
        exit(1);
        /* NOTREACHED */
}