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/* hostfs.c - Dummy filesystem to provide access to the hosts filesystem */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2007,2008,2009,2010 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config-util.h>
#define _BSD_SOURCE
#include <grub/fs.h>
#include <grub/file.h>
#include <grub/disk.h>
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/dl.h>
#include <grub/util/misc.h>
#include <grub/emu/hostdisk.h>
#include <grub/i18n.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
static int
is_dir (const char *path, const char *name)
{
int len1 = strlen(path);
int len2 = strlen(name);
int ret;
char *pathname = xmalloc (len1 + 1 + len2 + 1 + 13);
strcpy (pathname, path);
/* Avoid UNC-path "//name" on Cygwin. */
if (len1 > 0 && pathname[len1 - 1] != '/')
strcat (pathname, "/");
strcat (pathname, name);
ret = grub_util_is_directory (pathname);
free (pathname);
return ret;
}
struct grub_hostfs_data
{
char *filename;
grub_util_fd_t f;
};
static grub_err_t
grub_hostfs_dir (grub_device_t device, const char *path,
grub_fs_dir_hook_t hook, void *hook_data)
{
grub_util_fd_dir_t dir;
/* Check if the disk is our dummy disk. */
if (grub_strcmp (device->disk->name, "host"))
return grub_error (GRUB_ERR_BAD_FS, "not a hostfs");
dir = grub_util_fd_opendir (path);
if (! dir)
return grub_error (GRUB_ERR_BAD_FILENAME,
N_("can't open `%s': %s"), path,
grub_util_fd_strerror ());
while (1)
{
grub_util_fd_dirent_t de;
struct grub_dirhook_info info;
grub_memset (&info, 0, sizeof (info));
de = grub_util_fd_readdir (dir);
if (! de)
break;
info.dir = !! is_dir (path, de->d_name);
hook (de->d_name, &info, hook_data);
}
grub_util_fd_closedir (dir);
return GRUB_ERR_NONE;
}
/* Open a file named NAME and initialize FILE. */
static grub_err_t
grub_hostfs_open (struct grub_file *file, const char *name)
{
grub_util_fd_t f;
struct grub_hostfs_data *data;
f = grub_util_fd_open (name, GRUB_UTIL_FD_O_RDONLY);
if (! GRUB_UTIL_FD_IS_VALID (f))
return grub_error (GRUB_ERR_BAD_FILENAME,
N_("can't open `%s': %s"), name,
strerror (errno));
data = grub_malloc (sizeof (*data));
if (!data)
{
grub_util_fd_close (f);
return grub_errno;
}
data->filename = grub_strdup (name);
if (!data->filename)
{
grub_free (data);
grub_util_fd_close (f);
return grub_errno;
}
data->f = f;
file->data = data;
file->size = grub_util_get_fd_size (f, name, NULL);
return GRUB_ERR_NONE;
}
static grub_ssize_t
grub_hostfs_read (grub_file_t file, char *buf, grub_size_t len)
{
struct grub_hostfs_data *data;
data = file->data;
if (grub_util_fd_seek (data->f, file->offset) != 0)
{
grub_error (GRUB_ERR_OUT_OF_RANGE, N_("cannot seek `%s': %s"),
data->filename, grub_util_fd_strerror ());
return -1;
}
unsigned int s = grub_util_fd_read (data->f, buf, len);
if (s != len)
grub_error (GRUB_ERR_FILE_READ_ERROR, N_("cannot read `%s': %s"),
data->filename, grub_util_fd_strerror ());
return (signed) s;
}
static grub_err_t
grub_hostfs_close (grub_file_t file)
{
struct grub_hostfs_data *data;
data = file->data;
grub_util_fd_close (data->f);
grub_free (data->filename);
grub_free (data);
return GRUB_ERR_NONE;
}
static grub_err_t
grub_hostfs_label (grub_device_t device __attribute ((unused)),
char **label __attribute ((unused)))
{
*label = 0;
return GRUB_ERR_NONE;
}
static struct grub_fs grub_hostfs_fs =
{
.name = "hostfs",
.dir = grub_hostfs_dir,
.open = grub_hostfs_open,
.read = grub_hostfs_read,
.close = grub_hostfs_close,
.label = grub_hostfs_label,
.next = 0
};
GRUB_MOD_INIT(hostfs)
{
grub_fs_register (&grub_hostfs_fs);
}
GRUB_MOD_FINI(hostfs)
{
grub_fs_unregister (&grub_hostfs_fs);
}
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