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/* $NetBSD: ffs_appleufs.c,v 1.15 2015/02/15 11:04:43 maxv Exp $ */
/*
* Copyright (c) 2002 Darrin B. Jewell
* 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 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ffs_appleufs.c,v 1.15 2015/02/15 11:04:43 maxv Exp $");
#include <sys/param.h>
#include <sys/time.h>
#if defined(_KERNEL)
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/cprng.h>
#endif
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/ufs_bswap.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>
#if !defined(_KERNEL) && !defined(STANDALONE)
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#define KASSERT(x) assert(x)
#endif
/*
* This is the same calculation as in_cksum.
*/
u_int16_t
ffs_appleufs_cksum(const struct appleufslabel *appleufs)
{
const u_int16_t *p = (const u_int16_t *)appleufs;
int len = APPLEUFS_LABEL_SIZE; /* sizeof(struct appleufslabel) */
long res = 0;
while (len > 1) {
res += *p++;
len -= 2;
}
#if 0 /* APPLEUFS_LABEL_SIZE is guaranteed to be even */
if (len == 1)
res += htobe16(*(u_char *)p<<8);
#endif
res = (res >> 16) + (res & 0xffff);
res += (res >> 16);
return (~res);
}
/*
* Copies o to n, validating and byteswapping along the way. Returns 0 if ok,
* EINVAL if not valid.
*/
int
ffs_appleufs_validate(const char *name, const struct appleufslabel *o,
struct appleufslabel *n)
{
struct appleufslabel tmp;
if (!n)
n = &tmp;
if (o->ul_magic != be32toh(APPLEUFS_LABEL_MAGIC))
return EINVAL;
*n = *o;
n->ul_checksum = 0;
n->ul_checksum = ffs_appleufs_cksum(n);
n->ul_magic = be32toh(o->ul_magic);
n->ul_version = be32toh(o->ul_version);
n->ul_time = be32toh(o->ul_time);
n->ul_namelen = be16toh(o->ul_namelen);
if (n->ul_checksum != o->ul_checksum)
return EINVAL;
if (n->ul_namelen == 0)
return EINVAL;
if (n->ul_namelen > APPLEUFS_MAX_LABEL_NAME)
n->ul_namelen = APPLEUFS_MAX_LABEL_NAME;
n->ul_name[n->ul_namelen - 1] = '\0';
#ifdef DEBUG
printf("%s: found APPLE UFS label v%d: \"%s\"\n", name,
n->ul_version, n->ul_name);
#endif
n->ul_uuid = be64toh(o->ul_uuid);
return 0;
}
void
ffs_appleufs_set(struct appleufslabel *appleufs, const char *name, time_t t,
uint64_t uuid)
{
size_t namelen;
if (!name)
name = "untitled";
if (t == ((time_t)-1)) {
#if defined(_KERNEL)
t = time_second;
#elif defined(STANDALONE)
t = 0;
#else
(void)time(&t);
#endif
}
if (uuid == 0) {
#if defined(_KERNEL) && !defined(STANDALONE)
uuid = cprng_fast64();
#endif
}
namelen = strlen(name);
if (namelen > APPLEUFS_MAX_LABEL_NAME)
namelen = APPLEUFS_MAX_LABEL_NAME;
memset(appleufs, 0, APPLEUFS_LABEL_SIZE);
appleufs->ul_magic = htobe32(APPLEUFS_LABEL_MAGIC);
appleufs->ul_version = htobe32(APPLEUFS_LABEL_VERSION);
appleufs->ul_time = htobe32((u_int32_t)t);
appleufs->ul_namelen = htobe16(namelen);
strncpy(appleufs->ul_name, name, namelen);
appleufs->ul_uuid = htobe64(uuid);
appleufs->ul_checksum = ffs_appleufs_cksum(appleufs);
}
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