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Add cheatmounting

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2011-04-22 19:20:46 +02:00
parent dcd73ec05e
commit 24089d19e2
4 changed files with 166 additions and 40 deletions
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99
grub-core/disk/luks.c
View file

@ -25,6 +25,15 @@
#include <grub/crypto.h>
#include <grub/extcmd.h>
#include <grub/i18n.h>
#ifdef GRUB_UTIL
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <grub/emu/hostdisk.h>
#include <unistd.h>
#include <string.h>
#endif
GRUB_MOD_LICENSE ("GPLv3+");
@ -80,6 +89,10 @@ struct grub_luks
unsigned long id, source_id;
enum grub_disk_dev_id source_dev_id;
char uuid[sizeof (((struct grub_luks_phdr *) 0)->uuid) + 1];
#ifdef GRUB_UTIL
char *cheat;
int cheat_fd;
#endif
struct grub_luks *next;
};
typedef struct grub_luks *grub_luks_t;
@ -497,6 +510,12 @@ grub_luks_scan_device_real (const char *name, grub_disk_t source)
}
newdev->source = grub_strdup (name);
if (!newdev->source)
{
grub_free (newdev);
return grub_errno;
}
newdev->source_id = source->id;
newdev->source_dev_id = source->dev->id;
newdev->next = luks_list;
@ -507,6 +526,48 @@ grub_luks_scan_device_real (const char *name, grub_disk_t source)
return GRUB_ERR_NONE;
}
#ifdef GRUB_UTIL
grub_err_t
grub_luks_cheat_mount (const char *sourcedev, const char *cheat)
{
grub_err_t err;
struct grub_luks_phdr header;
grub_luks_t newdev;
grub_disk_t source;
/* Try to open disk. */
source = grub_disk_open (sourcedev);
if (!source)
return grub_errno;
/* Read the LUKS header. */
err = grub_disk_read (source, 0, 0, sizeof (header), &header);
if (err)
return err;
newdev = configure_ciphers (&header);
grub_disk_close (source);
if (!newdev)
return grub_errno;
newdev->cheat = grub_strdup (cheat);
newdev->source = grub_strdup (sourcedev);
if (!newdev->source || !newdev->cheat)
{
grub_free (newdev->source);
grub_free (newdev->cheat);
grub_free (newdev);
return grub_errno;
}
newdev->cheat_fd = -1;
newdev->source_id = source->id;
newdev->source_dev_id = source->dev->id;
newdev->next = luks_list;
luks_list = newdev;
return GRUB_ERR_NONE;
}
#endif
static int
grub_luks_scan_device (const char *name)
{
@ -575,6 +636,17 @@ grub_luks_open (const char *name, grub_disk_t disk,
if (!dev)
return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "No such device");
#ifdef GRUB_UTIL
if (dev->cheat)
{
if (dev->cheat_fd == -1)
dev->cheat_fd = open (dev->cheat, O_RDONLY);
if (dev->cheat_fd == -1)
return grub_error (GRUB_ERR_IO, "couldn't open %s: %s",
dev->cheat, strerror (errno));
}
#endif
if (!dev->source_disk)
{
grub_dprintf ("luks", "Opening device %s\n", name);
@ -599,11 +671,17 @@ grub_luks_close (grub_disk_t disk)
dev->ref--;
if (dev->ref == 0)
if (dev->ref != 0)
return;
#ifdef GRUB_UTIL
if (dev->cheat)
{
grub_disk_close (dev->source_disk);
dev->source_disk = NULL;
close (dev->cheat_fd);
dev->cheat_fd = -1;
}
#endif
grub_disk_close (dev->source_disk);
dev->source_disk = NULL;
}
static grub_err_t
@ -612,6 +690,21 @@ grub_luks_read (grub_disk_t disk, grub_disk_addr_t sector,
{
grub_luks_t dev = (grub_luks_t) disk->data;
grub_err_t err;
#ifdef GRUB_UTIL
if (dev->cheat)
{
err = grub_util_fd_sector_seek (dev->cheat_fd, dev->cheat, sector);
if (err)
return err;
if (grub_util_fd_read (dev->cheat_fd, buf, size << GRUB_DISK_SECTOR_BITS)
!= (ssize_t) (size << GRUB_DISK_SECTOR_BITS))
return grub_error (GRUB_ERR_READ_ERROR, "cannot read from `%s'",
dev->cheat);
return GRUB_ERR_NONE;
}
#endif
grub_dprintf ("luks",
"Reading %" PRIuGRUB_SIZE " sectors from sector 0x%"
PRIxGRUB_UINT64_T " with offset of %" PRIuGRUB_UINT32_T "\n",