/*        $NetBSD: hammer.c,v 1.4 2021/01/10 12:38:40 tkusumi Exp $      */

/*-
* Copyright (c) 2016-2019 The DragonFly Project
* Copyright (c) 2016-2019 Tomohiro Kusumi <[email protected]>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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>
__KERNEL_RCSID(0, "$NetBSD: hammer.c,v 1.4 2021/01/10 12:38:40 tkusumi Exp $");

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>
#include <uuid.h>

#include "fstyp.h"
#include "hammer_disk.h"

static hammer_volume_ondisk_t
read_ondisk(FILE *fp)
{
       return (read_buf(fp, 0, sizeof(struct hammer_volume_ondisk)));
}

static int
test_ondisk(const hammer_volume_ondisk_t ondisk)
{
       static int count = 0;
       static hammer_uuid_t fsid, fstype;
       static char label[64];

       if (ondisk->vol_signature != HAMMER_FSBUF_VOLUME &&
           ondisk->vol_signature != HAMMER_FSBUF_VOLUME_REV)
               return (1);
       if (ondisk->vol_rootvol != HAMMER_ROOT_VOLNO)
               return (1);
       if (ondisk->vol_no < 0 || ondisk->vol_no > HAMMER_MAX_VOLUMES - 1)
               return (1);
       if (ondisk->vol_count < 1 || ondisk->vol_count > HAMMER_MAX_VOLUMES)
               return (1);

       if (count == 0) {
               count = ondisk->vol_count;
               if (count == 0)
                       return (1);
               memcpy(&fsid, &ondisk->vol_fsid, sizeof(fsid));
               memcpy(&fstype, &ondisk->vol_fstype, sizeof(fstype));
               strlcpy(label, ondisk->vol_label, sizeof(label));
       } else {
               if (ondisk->vol_count != count)
                       return (1);
               if (!uuid_equal(&ondisk->vol_fsid, &fsid, NULL))
                       return (1);
               if (!uuid_equal(&ondisk->vol_fstype, &fstype, NULL))
                       return (1);
               if (strcmp(ondisk->vol_label, label))
                       return (1);
       }

       return (0);
}

static const char*
extract_device_name(const char *devpath)
{
       const char *p;

       p = strrchr(devpath, '/');
       if (p) {
               p++;
               if (*p == 0)
                       p = NULL;
       } else {
               p = devpath;
       }
       return (p);
}

int
fstyp_hammer(FILE *fp, char *label, size_t size)
{
       hammer_volume_ondisk_t ondisk;
       int error = 1;
#ifdef HAS_DEVPATH
       const char *p;
#endif
       ondisk = read_ondisk(fp);
       if (!ondisk)
               goto fail;
       if (ondisk->vol_no != HAMMER_ROOT_VOLNO)
               goto fail;
       if (ondisk->vol_count != 1)
               goto fail;
       if (test_ondisk(ondisk))
               goto fail;

       /*
        * fstyp_function in DragonFly takes an additional devpath argument
        * which doesn't exist in FreeBSD and NetBSD.
        */
#ifdef HAS_DEVPATH
       /* Add device name to help support multiple autofs -media mounts. */
       p = extract_device_name(devpath);
       if (p)
               snprintf(label, size, "%s_%s", ondisk->vol_label, p);
       else
               strlcpy(label, ondisk->vol_label, size);
#else
       strlcpy(label, ondisk->vol_label, size);
#endif
       error = 0;
fail:
       free(ondisk);
       return (error);
}

static int
test_volume(const char *volpath)
{
       hammer_volume_ondisk_t ondisk = NULL;
       FILE *fp;
       int volno = -1;

       if ((fp = fopen(volpath, "r")) == NULL)
               goto fail;

       ondisk = read_ondisk(fp);
       if (!ondisk)
               goto fail;
       if (test_ondisk(ondisk))
               goto fail;

       volno = ondisk->vol_no;
fail:
       if (fp)
               fclose(fp);
       free(ondisk);
       return (volno);
}

static int
__fsvtyp_hammer(const char *blkdevs, char *label, size_t size, int partial)
{
       hammer_volume_ondisk_t ondisk = NULL;
       FILE *fp = NULL;
       char *dup = NULL, *p, *volpath, *rootvolpath, x[HAMMER_MAX_VOLUMES];
       int i, volno, error = 1;

       if (!blkdevs)
               goto fail;

       memset(x, 0, sizeof(x));
       dup = strdup(blkdevs);
       p = dup;

       volpath = NULL;
       rootvolpath = NULL;
       volno = -1;
       while (p) {
               volpath = p;
               if ((p = strchr(p, ':')) != NULL)
                       *p++ = '\0';
               if ((volno = test_volume(volpath)) == -1)
                       break;
               if (volno < 0 || volno >= HAMMER_MAX_VOLUMES)
                       goto fail;
               x[volno]++;
               if (volno == HAMMER_ROOT_VOLNO)
                       rootvolpath = volpath;
       }

       /* If no rootvolpath, proceed only if partial mode with volpath. */
       if (rootvolpath)
               volpath = rootvolpath;
       else if (!partial || !volpath)
               goto fail;
       if ((fp = fopen(volpath, "r")) == NULL)
               goto fail;
       ondisk = read_ondisk(fp);
       if (!ondisk)
               goto fail;

       if (volno == -1)
               goto fail;
       if (partial)
               goto success;

       for (i = 0; i < HAMMER_MAX_VOLUMES; i++)
               if (x[i] > 1)
                       goto fail;
       for (i = 0; i < HAMMER_MAX_VOLUMES; i++)
               if (x[i] == 0)
                       break;
       if (ondisk->vol_count != i)
               goto fail;
       for (; i < HAMMER_MAX_VOLUMES; i++)
               if (x[i] != 0)
                       goto fail;
success:
       /* Add device name to help support multiple autofs -media mounts. */
       p = __UNCONST(extract_device_name(volpath));
       if (p)
               snprintf(label, size, "%s_%s", ondisk->vol_label, p);
       else
               strlcpy(label, ondisk->vol_label, size);
       error = 0;
fail:
       if (fp)
               fclose(fp);
       free(ondisk);
       free(dup);
       return (error);
}

int
fsvtyp_hammer(const char *blkdevs, char *label, size_t size)
{
       return (__fsvtyp_hammer(blkdevs, label, size, 0));
}

int
fsvtyp_hammer_partial(const char *blkdevs, char *label, size_t size)
{
       return (__fsvtyp_hammer(blkdevs, label, size, 1));
}

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