| /* hostfs.c - Dummy filesystem to provide access to the hosts filesystem */ |
| /* |
| * GRUB -- GRand Unified Bootloader |
| * Copyright (C) 2007,2008 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/>. |
| */ |
| #define _BSD_SOURCE |
| #include <grub/fs.h> |
| #include <grub/file.h> |
| #include <grub/disk.h> |
| #include <grub/misc.h> |
| #include <grub/dl.h> |
| #include <grub/util/misc.h> |
| |
| #include <dirent.h> |
| #include <stdio.h> |
| |
| |
| /* dirent.d_type is a BSD extension, not part of POSIX */ |
| #include <sys/stat.h> |
| #include <string.h> |
| |
| static int |
| is_dir (const char *path, const char *name) |
| { |
| int len1 = strlen(path); |
| int len2 = strlen(name); |
| |
| char pathname[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); |
| |
| struct stat st; |
| if (stat (pathname, &st)) |
| return 0; |
| return S_ISDIR (st.st_mode); |
| } |
| |
| static grub_err_t |
| grub_hostfs_dir (grub_device_t device, const char *path, |
| int (*hook) (const char *filename, |
| const struct grub_dirhook_info *info)) |
| { |
| DIR *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 = opendir (path); |
| if (! dir) |
| return grub_error (GRUB_ERR_BAD_FILENAME, |
| "can't open the hostfs directory `%s'", path); |
| |
| while (1) |
| { |
| struct dirent *de; |
| struct grub_dirhook_info info; |
| grub_memset (&info, 0, sizeof (info)); |
| |
| de = readdir (dir); |
| if (! de) |
| break; |
| |
| info.dir = !! is_dir (path, de->d_name); |
| hook (de->d_name, &info); |
| |
| } |
| |
| 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) |
| { |
| FILE *f; |
| |
| f = fopen (name, "rb"); |
| if (! f) |
| return grub_error (GRUB_ERR_BAD_FILENAME, |
| "can't open `%s'", name); |
| file->data = f; |
| |
| #ifdef __MINGW32__ |
| file->size = grub_util_get_disk_size (name); |
| #else |
| fseeko (f, 0, SEEK_END); |
| file->size = ftello (f); |
| fseeko (f, 0, SEEK_SET); |
| #endif |
| |
| return GRUB_ERR_NONE; |
| } |
| |
| static grub_ssize_t |
| grub_hostfs_read (grub_file_t file, char *buf, grub_size_t len) |
| { |
| FILE *f; |
| |
| f = (FILE *) file->data; |
| fseeko (f, file->offset, SEEK_SET); |
| int s = fread (buf, 1, len, f); |
| |
| return s; |
| } |
| |
| static grub_err_t |
| grub_hostfs_close (grub_file_t file) |
| { |
| FILE *f; |
| |
| f = (FILE *) file->data; |
| fclose (f); |
| |
| 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); |
| } |