diff options
Diffstat (limited to 'grub-core/kern/emu/hostfs.c')
| -rw-r--r-- | grub-core/kern/emu/hostfs.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/grub-core/kern/emu/hostfs.c b/grub-core/kern/emu/hostfs.c new file mode 100644 index 0000000..cb53210 --- /dev/null +++ b/grub-core/kern/emu/hostfs.c @@ -0,0 +1,200 @@ +/* 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; +} + +#undef open +#undef close + +static struct grub_fs grub_hostfs_fs = + { + .name = "hostfs", + .fs_dir = grub_hostfs_dir, + .fs_open = grub_hostfs_open, + .fs_read = grub_hostfs_read, + .fs_close = grub_hostfs_close, + .fs_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); +} |