diff options
Diffstat (limited to 'grub-core/kern/emu/hostfs.c')
| -rw-r--r-- | grub-core/kern/emu/hostfs.c | 175 |
1 files changed, 175 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..501ad46 --- /dev/null +++ b/grub-core/kern/emu/hostfs.c @@ -0,0 +1,175 @@ +/* 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/>. + */ +#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> +#include <errno.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; + if (fseeko (f, file->offset, SEEK_SET) != 0) + { + grub_error (GRUB_ERR_OUT_OF_RANGE, "fseeko: %s", strerror (errno)); + return -1; + } + + unsigned int s = fread (buf, 1, len, f); + if (s != len) + grub_error (GRUB_ERR_FILE_READ_ERROR, "fread: %s", strerror (errno)); + + return (signed) 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); +} |