/* $NetBSD: mount_msdos.c,v 1.50 2016/08/21 22:27:20 jdolecek Exp $ */

/*
 * Copyright (c) 1994 Christopher G. Demetriou
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *          This product includes software developed for the
 *          NetBSD Project.  See http://www.NetBSD.org/ for
 *          information about NetBSD.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 * 
 * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
 */

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: mount_msdos.c,v 1.50 2016/08/21 22:27:20 jdolecek Exp $");
#endif /* not lint */

#include <sys/param.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <msdosfs/msdosfsmount.h>
#include <err.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <util.h>

#include <mntopts.h>

#include "mountprog.h"
#include "mount_msdos.h"

static const struct mntopt mopts[] = {
        MOPT_STDOPTS,
        MOPT_ASYNC,
        MOPT_SYNC,
        MOPT_UPDATE,
        MOPT_GETARGS,
        MOPT_NULL,
};

static void     usage(void) __dead;

#ifndef MOUNT_NOMAIN
int
main(int argc, char **argv)
{

        setprogname(argv[0]);
        return mount_msdos(argc, argv);
}
#endif

void
mount_msdos_parseargs(int argc, char **argv,
        struct msdosfs_args *args, int *mntflags,
        char *canon_dev, char *canon_dir)
{
        struct stat sb;
        int c, set_gid, set_uid, set_mask, set_dirmask, set_gmtoff;
        char *dev, *dir;
        time_t now;
        struct tm *tm;
        mntoptparse_t mp;

        *mntflags = set_gid = set_uid = set_mask = set_dirmask = set_gmtoff = 0;
        (void)memset(args, '\0', sizeof(*args));

        while ((c = getopt(argc, argv, "Gsl9Uu:g:m:M:o:t:")) != -1) {
                switch (c) {
                case 'G':
                        args->flags |= MSDOSFSMNT_GEMDOSFS;
                        break;
                case 's':
                        args->flags |= MSDOSFSMNT_SHORTNAME;
                        break;
                case 'l':
                        args->flags |= MSDOSFSMNT_LONGNAME;
                        break;
                case '9':
                        args->flags |= MSDOSFSMNT_NOWIN95;
                        break;
                case 'U':
                        args->flags |= MSDOSFSMNT_UTF8;
                        break;
                case 'u':
                        args->uid = a_uid(optarg);
                        set_uid = 1;
                        break;
                case 'g':
                        args->gid = a_gid(optarg);
                        set_gid = 1;
                        break;
                case 'm':
                        args->mask = a_mask(optarg);
                        set_mask = 1;
                        break;
                case 'M':
                        args->dirmask = a_mask(optarg);
                        set_dirmask = 1;
                        break;
                case 'o':
                        mp = getmntopts(optarg, mopts, mntflags, 0);
                        if (mp == NULL)
                                err(1, "getmntopts");
                        freemntopts(mp);
                        break;
                case 't':
                        args->gmtoff = atoi(optarg);
                        set_gmtoff = 1;
                        break;
                case '?':
                default:
                        usage();
                        break;
                }
        }

        if (optind + 2 != argc)
                usage();

        if (set_mask && !set_dirmask) {
                args->dirmask = args->mask;
                set_dirmask = 1;
        } else if (set_dirmask && !set_mask) {
                args->mask = args->dirmask;
                set_mask = 1;
        }

        dev = argv[optind];
        dir = argv[optind + 1];

        pathadj(dev, canon_dev);
        pathadj(dir, canon_dir);

        args->fspec = canon_dev;
        if (!set_gid || !set_uid || !set_mask) {
                if (stat(dir, &sb) == -1)
                        err(1, "stat %s", dir);

                if (!set_uid)
                        args->uid = sb.st_uid;
                if (!set_gid)
                        args->gid = sb.st_gid;
                if (!set_mask) {
                        args->mask = args->dirmask =
                                sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
                }
        }

        if (!set_gmtoff) {
                /* use user's time zone as default */
                time(&now);
                tm = localtime(&now);
                args->gmtoff = tm->tm_gmtoff;

        }
        args->flags |= MSDOSFSMNT_VERSIONED;
        args->version = MSDOSFSMNT_VERSION;
}

int
mount_msdos(int argc, char **argv)
{
        struct msdosfs_args args;
        char canon_dev[MAXPATHLEN], canon_dir[MAXPATHLEN];
        int mntflags;

        mount_msdos_parseargs(argc, argv, &args, &mntflags,
            canon_dev, canon_dir);

        if (mount(MOUNT_MSDOS, canon_dir, mntflags, &args, sizeof args) == -1)
                err(1, "%s on %s", canon_dev, canon_dir);

        if (mntflags & MNT_GETARGS) {
                char buf[1024];
                (void)snprintb(buf, sizeof(buf), MSDOSFSMNT_BITS, args.flags);
                printf("uid=%d, gid=%d, mask=0%o, dirmask=0%o, gmtoff=%d, flags=%s\n",
                    args.uid, args.gid, args.mask, args.dirmask,
                    args.gmtoff, buf);
        }

        exit (0);
}

static void
usage(void)
{

        fprintf(stderr, "usage: %s [-9GlsU] [-g gid] [-M mask] [-m mask] "
            "[-o options]\n\t[-t gmtoff] [-u uid] special mountpath\n",
            getprogname());
        exit(1);
}