| /* 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> |
| |
| #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); |
| } |