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/*
* Copyright (C) 1999 by Andries Brouwer
* Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
* Copyright (C) 2001 by Andreas Dilger
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
* Copyright (C) 2008 Karel Zak <kzak@redhat.com>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <stdint.h>
#include "superblocks.h"
/* linux-2.6/include/linux/swap.h */
struct swap_header_v1_2 {
/* char bootbits[1024]; */ /* Space for disklabel etc. */
uint32_t version;
uint32_t lastpage;
uint32_t nr_badpages;
unsigned char uuid[16];
unsigned char volume[16];
uint32_t padding[117];
uint32_t badpages[1];
} __attribute__((packed));
#define PAGESIZE_MIN 0xff6 /* 4086 (arm, i386, ...) */
#define PAGESIZE_MAX 0xfff6 /* 65526 (ia64) */
#define TOI_MAGIC_STRING "\xed\xc3\x02\xe9\x98\x56\xe5\x0c"
#define TOI_MAGIC_STRLEN (sizeof(TOI_MAGIC_STRING) - 1)
static int swap_set_info(blkid_probe pr, const char *version)
{
struct swap_header_v1_2 *hdr;
/* Swap header always located at offset of 1024 bytes */
hdr = (struct swap_header_v1_2 *) blkid_probe_get_buffer(pr, 1024,
sizeof(struct swap_header_v1_2));
if (!hdr)
return errno ? -errno : 1;
/* SWAPSPACE2 - check for wrong version or zeroed pagecount */
if (strcmp(version, "1") == 0) {
if (hdr->version != 1 && swab32(hdr->version) != 1) {
DBG(LOWPROBE, ul_debug("incorrect swap version"));
return 1;
}
if (hdr->lastpage == 0) {
DBG(LOWPROBE, ul_debug("not set last swap page"));
return 1;
}
}
/* arbitrary sanity check.. is there any garbage down there? */
if (hdr->padding[32] == 0 && hdr->padding[33] == 0) {
if (hdr->volume[0] && blkid_probe_set_label(pr, hdr->volume,
sizeof(hdr->volume)) < 0)
return 1;
if (blkid_probe_set_uuid(pr, hdr->uuid) < 0)
return 1;
}
blkid_probe_set_version(pr, version);
return 0;
}
static int probe_swap(blkid_probe pr, const struct blkid_idmag *mag)
{
unsigned char *buf;
if (!mag)
return 1;
/* TuxOnIce keeps valid swap header at the end of the 1st page */
buf = blkid_probe_get_buffer(pr, 0, TOI_MAGIC_STRLEN);
if (!buf)
return errno ? -errno : 1;
if (memcmp(buf, TOI_MAGIC_STRING, TOI_MAGIC_STRLEN) == 0)
return 1; /* Ignore swap signature, it's TuxOnIce */
if (!memcmp(mag->magic, "SWAP-SPACE", mag->len)) {
/* swap v0 doesn't support LABEL or UUID */
blkid_probe_set_version(pr, "0");
return 0;
}
if (!memcmp(mag->magic, "SWAPSPACE2", mag->len))
return swap_set_info(pr, "1");
return 1;
}
static int probe_swsuspend(blkid_probe pr, const struct blkid_idmag *mag)
{
if (!mag)
return 1;
if (!memcmp(mag->magic, "S1SUSPEND", mag->len))
return swap_set_info(pr, "s1suspend");
if (!memcmp(mag->magic, "S2SUSPEND", mag->len))
return swap_set_info(pr, "s2suspend");
if (!memcmp(mag->magic, "ULSUSPEND", mag->len))
return swap_set_info(pr, "ulsuspend");
if (!memcmp(mag->magic, TOI_MAGIC_STRING, TOI_MAGIC_STRLEN))
return swap_set_info(pr, "tuxonice");
if (!memcmp(mag->magic, "LINHIB0001", mag->len))
return swap_set_info(pr, "linhib0001");
return 1; /* no signature detected */
}
const struct blkid_idinfo swap_idinfo =
{
.name = "swap",
.usage = BLKID_USAGE_OTHER,
.probefunc = probe_swap,
.minsz = 10 * 4096, /* 10 pages */
.magics =
{
{ .magic = "SWAP-SPACE", .len = 10, .sboff = 0xff6 },
{ .magic = "SWAPSPACE2", .len = 10, .sboff = 0xff6 },
{ .magic = "SWAP-SPACE", .len = 10, .sboff = 0x1ff6 },
{ .magic = "SWAPSPACE2", .len = 10, .sboff = 0x1ff6 },
{ .magic = "SWAP-SPACE", .len = 10, .sboff = 0x3ff6 },
{ .magic = "SWAPSPACE2", .len = 10, .sboff = 0x3ff6 },
{ .magic = "SWAP-SPACE", .len = 10, .sboff = 0x7ff6 },
{ .magic = "SWAPSPACE2", .len = 10, .sboff = 0x7ff6 },
{ .magic = "SWAP-SPACE", .len = 10, .sboff = 0xfff6 },
{ .magic = "SWAPSPACE2", .len = 10, .sboff = 0xfff6 },
{ NULL }
}
};
const struct blkid_idinfo swsuspend_idinfo =
{
.name = "swsuspend",
.usage = BLKID_USAGE_OTHER,
.probefunc = probe_swsuspend,
.minsz = 10 * 4096, /* 10 pages */
.magics =
{
{ .magic = TOI_MAGIC_STRING, .len = TOI_MAGIC_STRLEN },
{ .magic = "S1SUSPEND", .len = 9, .sboff = 0xff6 },
{ .magic = "S2SUSPEND", .len = 9, .sboff = 0xff6 },
{ .magic = "ULSUSPEND", .len = 9, .sboff = 0xff6 },
{ .magic = "LINHIB0001", .len = 10, .sboff = 0xff6 },
{ .magic = "S1SUSPEND", .len = 9, .sboff = 0x1ff6 },
{ .magic = "S2SUSPEND", .len = 9, .sboff = 0x1ff6 },
{ .magic = "ULSUSPEND", .len = 9, .sboff = 0x1ff6 },
{ .magic = "LINHIB0001", .len = 10, .sboff = 0x1ff6 },
{ .magic = "S1SUSPEND", .len = 9, .sboff = 0x3ff6 },
{ .magic = "S2SUSPEND", .len = 9, .sboff = 0x3ff6 },
{ .magic = "ULSUSPEND", .len = 9, .sboff = 0x3ff6 },
{ .magic = "LINHIB0001", .len = 10, .sboff = 0x3ff6 },
{ .magic = "S1SUSPEND", .len = 9, .sboff = 0x7ff6 },
{ .magic = "S2SUSPEND", .len = 9, .sboff = 0x7ff6 },
{ .magic = "ULSUSPEND", .len = 9, .sboff = 0x7ff6 },
{ .magic = "LINHIB0001", .len = 10, .sboff = 0x7ff6 },
{ .magic = "S1SUSPEND", .len = 9, .sboff = 0xfff6 },
{ .magic = "S2SUSPEND", .len = 9, .sboff = 0xfff6 },
{ .magic = "ULSUSPEND", .len = 9, .sboff = 0xfff6 },
{ .magic = "LINHIB0001", .len = 10, .sboff = 0xfff6 },
{ NULL }
}
};
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