/*
 * Copyright (c) 2009 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Alex Hornung <ahornung@gmail.com>
 *
 * 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 DragonFly Project 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 COPYRIGHT HOLDERS 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
 * COPYRIGHT HOLDERS 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/param.h>
#include <sys/mount.h>
#include <sys/devfs.h>

#include <err.h>
#include <mntopts.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>

#if 0
#define MOPT_UPDATE         { "update",     0, MNT_UPDATE, 0 }
#endif
#define MOPT_DEVFSOPTS          \
        { "ruleset=", 0, DEVFS_MNT_RULESET, 1 },        \
        { "jail", 0, DEVFS_MNT_JAIL, 1 }


struct mntopt mopts[] = {
        MOPT_STDOPTS,
        MOPT_DEVFSOPTS,
#if 0
        MOPT_UPDATE,
#endif
        MOPT_NULL
};

static void     usage(void);

int
main(int argc, char **argv)
{
        struct statfs sfb;
        struct devfs_mount_info info;
        int ch, mntflags;
        char *ptr, *mntto;
        char mntpoint[MAXPATHLEN];
        char rule_file[MAXPATHLEN];
        struct vfsconf vfc;
        int error;
        info.flags = 0;
        int i,k;
        int mounted = 0;

        mntflags = 0;

        while ((ch = getopt(argc, argv, "o:")) != -1)
                switch(ch) {
                case 'o':
                        getmntopts(optarg, mopts, &mntflags, &info.flags);
                        ptr = strstr(optarg, "ruleset=");
                        if (ptr) {
                                ptr += 8;
                                for (i = 0, k = 0;
                                    (i < MAXPATHLEN) && (ptr[i] != '\0') && (ptr[i] != ',');
                                    i++) {
                                        rule_file[k++] = ptr[i];

                                }
                                rule_file[k] = '\0';
                        }
                        break;
                case '?':
                default:
                        usage();
                }
        argc -= optind;
        argv += optind;

        if (argc < 1)
                usage();

        /* resolve mount point with realpath(3) */
        switch(argc) {
        case 1:
                mntto = argv[0];
                break;
        case 2:
                mntto = argv[1];
                break;
        default:
                mntto = NULL;
                usage();
                /* NOTREACHED */
        }

        checkpath(mntto, mntpoint);

        error = getvfsbyname("devfs", &vfc);
        if (error && vfsisloadable("devfs")) {
                if(vfsload("devfs"))
                        err(EX_OSERR, "vfsload(devfs)");
                endvfsent();
                error = getvfsbyname("devfs", &vfc);
        }
        if (error)
                errx(EX_OSERR, "devfs filesystem is not available");

        error = statfs(mntpoint, &sfb);

        if (error)
                err(EX_OSERR, "could not statfs() the mount point");

        if ((!strcmp(sfb.f_fstypename, "devfs")) &&
            (!strcmp(sfb.f_mntfromname, "devfs"))) {
                mounted = 1;
        }

        if (!mounted) {
                if (mount(vfc.vfc_name, mntpoint, mntflags, &info))
                        err(1, NULL);
        } else {
                if (fork() == 0) {
                        execlp("devfsctl", "devfsctl",
                            "-m", mntpoint,
                                "-c",
                                "-r",
                                NULL);
                }
        }

        if (info.flags & DEVFS_MNT_RULESET) {
                if (fork() == 0) {
                        execlp("devfsctl", "devfsctl",
                            "-m", mntpoint,
                                "-a",
                                "-f", rule_file,
                            NULL);
                }
        }
        exit(0);
}

static void
usage(void)
{
        fprintf(stderr,
            "usage: mount_devfs [-o options] [mount_from] mount_point\n");
        exit(1);
}