a1a8b1b90a
* Makefile.util.def (libgrubmods): Add odc.c, newc.c and cpio_be.c. * grub-core/Makefile.core.def (newc): New module. (odc): Likewise. (cpio_be): Likewise. * grub-core/fs/cpio.c (ALIGN_CPIO): New macro. (MAGIC): Likewise. (MAGIC2): Likewise. (head) [MODE_ODC]: Adapt for the format. (head) [MODE_NEWC]: Likewise. (head) [!MODE_*]: Write fields of interest as arrays. (MAGIC_USTAR): Removed. (read_number) [MODE_NEWC]: Change to hex. (read_number) [!MODE_*]: Parse binary arrays. (grub_cpio_find_file): Factor out the code for better structure and always use read_number. (grub_cpio_mount): Use MAGIC and MAGIC2. (grub_cpio_dir): Exit on first hook non-0 return. (grub_cpio_fs) [MODE_ODC]: Set name to odc. (grub_cpio_fs) [MODE_NEWC]: Set name to newc. (GRUB_MOD_INIT) [MODE_ODC]: Set name to odc. (GRUB_MOD_INIT) [MODE_NEWC]: Set name to newc. (GRUB_MOD_FINI) [MODE_ODC]: Set name to odc. (GRUB_MOD_FINI) [MODE_NEWC]: Set name to newc. * grub-core/fs/newc.c: New file. * grub-core/fs/odc.c: Likewise. * grub-core/fs/cpio_be.c: Likewise.
745 lines
15 KiB
C
745 lines
15 KiB
C
/* cpio.c - cpio and tar filesystem. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2007,2008,2009 Free Software Foundation, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/file.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/disk.h>
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#include <grub/dl.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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#define ATTR_TYPE 0160000
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#define ATTR_FILE 0100000
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#define ATTR_DIR 0040000
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#define ATTR_LNK 0120000
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#ifdef MODE_ODC
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#define ALIGN_CPIO(x) x
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#define MAGIC "070707"
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struct head
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{
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char magic[6];
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char dev[6];
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char ino[6];
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char mode[6];
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char uid[6];
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char gid[6];
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char nlink[6];
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char rdev[6];
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char mtime[11];
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char namesize[6];
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char filesize[11];
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} __attribute__ ((packed));
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#elif defined (MODE_NEWC)
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#define ALIGN_CPIO(x) (ALIGN_UP ((x), 4))
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#define MAGIC "070701"
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#define MAGIC2 "070702"
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struct head
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{
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char magic[6];
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char ino[8];
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char mode[8];
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char uid[8];
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char gid[8];
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char nlink[8];
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char mtime[8];
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char filesize[8];
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char devmajor[8];
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char devminor[8];
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char rdevmajor[8];
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char rdevminor[8];
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char namesize[8];
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char check[8];
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} __attribute__ ((packed));
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#elif !defined (MODE_USTAR)
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/* cpio support */
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#define ALIGN_CPIO(x) (ALIGN_UP ((x), 2))
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#ifdef MODE_BIGENDIAN
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#define MAGIC "\x71\xc7"
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#else
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#define MAGIC "\xc7\x71"
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#endif
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struct head
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{
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grub_uint16_t magic[1];
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grub_uint16_t dev;
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grub_uint16_t ino;
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grub_uint16_t mode[1];
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grub_uint16_t uid;
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grub_uint16_t gid;
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grub_uint16_t nlink;
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grub_uint16_t rdev;
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grub_uint16_t mtime[2];
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grub_uint16_t namesize[1];
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grub_uint16_t filesize[2];
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} __attribute__ ((packed));
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#else
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/* tar support */
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#define MAGIC "ustar"
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struct head
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{
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char name[100];
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char mode[8];
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char uid[8];
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char gid[8];
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char size[12];
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char mtime[12];
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char chksum[8];
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char typeflag;
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char linkname[100];
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char magic[6];
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char version[2];
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char uname[32];
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char gname[32];
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char devmajor[8];
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char devminor[8];
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char prefix[155];
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} __attribute__ ((packed));
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#endif
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struct grub_cpio_data
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{
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grub_disk_t disk;
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grub_off_t hofs;
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grub_off_t dofs;
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grub_off_t size;
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#ifdef MODE_USTAR
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char *linkname;
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grub_size_t linkname_alloc;
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#endif
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};
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static grub_dl_t my_mod;
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static inline void
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canonicalize (char *name)
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{
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char *iptr, *optr;
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for (iptr = name, optr = name; *iptr; )
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{
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while (*iptr == '/')
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iptr++;
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if (iptr[0] == '.' && (iptr[1] == '/' || iptr[1] == 0))
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{
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iptr += 2;
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continue;
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}
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while (*iptr && *iptr != '/')
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*optr++ = *iptr++;
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if (*iptr)
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*optr++ = *iptr++;
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}
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*optr = 0;
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}
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#if defined (MODE_ODC) || defined (MODE_USTAR)
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static inline unsigned long long
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read_number (const char *str, grub_size_t size)
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{
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unsigned long long ret = 0;
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while (size-- && *str >= '0' && *str <= '7')
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ret = (ret << 3) | (*str++ & 0xf);
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return ret;
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}
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#elif defined (MODE_NEWC)
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static inline unsigned long long
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read_number (const char *str, grub_size_t size)
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{
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unsigned long long ret = 0;
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while (size-- && grub_isxdigit (*str))
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{
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char dig = *str++;
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if (dig >= '0' && dig <= '9')
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dig &= 0xf;
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else if (dig >= 'a' && dig <= 'f')
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dig -= 'a' - 10;
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else
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dig -= 'A' - 10;
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ret = (ret << 4) | (dig);
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}
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return ret;
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}
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#else
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static inline unsigned long long
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read_number (const grub_uint16_t *arr, grub_size_t size)
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{
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long long ret = 0;
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#ifdef MODE_BIGENDIAN
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while (size--)
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ret = (ret << 16) | grub_be_to_cpu16 (*arr++);
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#else
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while (size--)
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ret = (ret << 16) | grub_le_to_cpu16 (*arr++);
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#endif
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return ret;
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}
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#endif
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static grub_err_t
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grub_cpio_find_file (struct grub_cpio_data *data, char **name,
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grub_int32_t *mtime, grub_disk_addr_t *ofs,
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grub_uint32_t *mode)
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{
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#ifndef MODE_USTAR
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struct head hd;
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grub_size_t namesize;
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grub_uint32_t modeval;
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if (grub_disk_read (data->disk, 0, data->hofs, sizeof (hd), &hd))
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return grub_errno;
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if (grub_memcmp (hd.magic, MAGIC, sizeof (hd.magic)) != 0
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#ifdef MAGIC2
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&& grub_memcmp (hd.magic, MAGIC2, sizeof (hd.magic)) != 0
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#endif
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)
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return grub_error (GRUB_ERR_BAD_FS, "invalid cpio archive");
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data->size = read_number (hd.filesize, ARRAY_SIZE (hd.filesize));
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if (mtime)
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*mtime = read_number (hd.mtime, ARRAY_SIZE (hd.mtime));
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modeval = read_number (hd.mode, ARRAY_SIZE (hd.mode));
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namesize = read_number (hd.namesize, ARRAY_SIZE (hd.namesize));
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if (mode)
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*mode = modeval;
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*name = grub_malloc (namesize + 1);
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if (*name == NULL)
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return grub_errno;
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if (grub_disk_read (data->disk, 0, data->hofs + sizeof (hd),
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namesize, *name))
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{
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grub_free (*name);
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return grub_errno;
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}
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(*name)[namesize] = 0;
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if (data->size == 0 && modeval == 0 && namesize == 11
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&& grub_memcmp(*name, "TRAILER!!!", 11) == 0)
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{
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*ofs = 0;
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grub_free (*name);
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return GRUB_ERR_NONE;
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}
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canonicalize (*name);
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data->dofs = data->hofs + ALIGN_CPIO (sizeof (hd) + namesize);
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*ofs = data->dofs + ALIGN_CPIO (data->size);
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#else
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struct head hd;
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int reread = 0, have_longname = 0, have_longlink = 0;
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for (reread = 0; reread < 3; reread++)
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{
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if (grub_disk_read (data->disk, 0, data->hofs, sizeof (hd), &hd))
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return grub_errno;
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if (!hd.name[0])
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{
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*ofs = 0;
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return GRUB_ERR_NONE;
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}
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if (grub_memcmp (hd.magic, MAGIC, sizeof (MAGIC) - 1))
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return grub_error (GRUB_ERR_BAD_FS, "invalid tar archive");
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if (hd.typeflag == 'L')
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{
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grub_err_t err;
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grub_size_t namesize = read_number (hd.size, sizeof (hd.size));
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*name = grub_malloc (namesize + 1);
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if (*name == NULL)
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return grub_errno;
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err = grub_disk_read (data->disk, 0,
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data->hofs + GRUB_DISK_SECTOR_SIZE, namesize,
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*name);
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(*name)[namesize] = 0;
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if (err)
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return err;
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data->hofs += GRUB_DISK_SECTOR_SIZE
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+ ((namesize + GRUB_DISK_SECTOR_SIZE - 1) &
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~(GRUB_DISK_SECTOR_SIZE - 1));
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have_longname = 1;
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continue;
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}
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if (hd.typeflag == 'K')
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{
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grub_err_t err;
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grub_size_t linksize = read_number (hd.size, sizeof (hd.size));
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if (data->linkname_alloc < linksize + 1)
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{
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char *n;
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n = grub_malloc (2 * (linksize + 1));
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if (!n)
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return grub_errno;
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grub_free (data->linkname);
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data->linkname = n;
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data->linkname_alloc = 2 * (linksize + 1);
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}
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err = grub_disk_read (data->disk, 0,
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data->hofs + GRUB_DISK_SECTOR_SIZE, linksize,
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data->linkname);
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if (err)
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return err;
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data->linkname[linksize] = 0;
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data->hofs += GRUB_DISK_SECTOR_SIZE
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+ ((linksize + GRUB_DISK_SECTOR_SIZE - 1) &
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~(GRUB_DISK_SECTOR_SIZE - 1));
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have_longlink = 1;
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continue;
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}
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if (!have_longname)
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{
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*name = grub_strndup (hd.name, sizeof (hd.name));
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if (*name == NULL)
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return grub_errno;
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}
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data->size = read_number (hd.size, sizeof (hd.size));
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data->dofs = data->hofs + GRUB_DISK_SECTOR_SIZE;
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*ofs = data->dofs + ((data->size + GRUB_DISK_SECTOR_SIZE - 1) &
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~(GRUB_DISK_SECTOR_SIZE - 1));
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if (mtime)
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*mtime = read_number (hd.mtime, sizeof (hd.mtime));
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if (mode)
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{
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*mode = read_number (hd.mode, sizeof (hd.mode));
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switch (hd.typeflag)
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{
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case '2':
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*mode |= ATTR_LNK;
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break;
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case '0':
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*mode |= ATTR_FILE;
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break;
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case '5':
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*mode |= ATTR_DIR;
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break;
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}
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}
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if (!have_longlink)
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{
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if (data->linkname_alloc < 101)
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{
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char *n;
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n = grub_malloc (101);
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if (!n)
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return grub_errno;
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grub_free (data->linkname);
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data->linkname = n;
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data->linkname_alloc = 101;
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}
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grub_memcpy (data->linkname, hd.linkname, sizeof (hd.linkname));
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data->linkname[100] = 0;
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}
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canonicalize (*name);
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return GRUB_ERR_NONE;
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}
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#endif
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return GRUB_ERR_NONE;
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}
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static struct grub_cpio_data *
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grub_cpio_mount (grub_disk_t disk)
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{
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struct head hd;
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struct grub_cpio_data *data;
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if (grub_disk_read (disk, 0, 0, sizeof (hd), &hd))
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goto fail;
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if (grub_memcmp (hd.magic, MAGIC, sizeof (MAGIC) - 1)
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#ifdef MAGIC2
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&& grub_memcmp (hd.magic, MAGIC2, sizeof (MAGIC2) - 1)
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#endif
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)
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goto fail;
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data = (struct grub_cpio_data *) grub_zalloc (sizeof (*data));
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if (!data)
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goto fail;
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data->disk = disk;
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return data;
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fail:
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grub_error (GRUB_ERR_BAD_FS, "not a "
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#ifdef MODE_USTAR
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"tar"
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#else
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"cpio"
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#endif
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" filesystem");
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return 0;
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}
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static grub_err_t
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handle_symlink (struct grub_cpio_data *data,
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const char *fn, char **name,
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grub_uint32_t mode, int *restart)
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{
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grub_size_t flen;
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char *target;
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#ifndef MODE_USTAR
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grub_err_t err;
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#endif
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char *ptr;
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char *lastslash;
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grub_size_t prefixlen;
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char *rest;
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grub_size_t size;
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*restart = 0;
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if ((mode & ATTR_TYPE) != ATTR_LNK)
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return GRUB_ERR_NONE;
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flen = grub_strlen (fn);
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if (grub_memcmp (*name, fn, flen) != 0
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|| ((*name)[flen] != 0 && (*name)[flen] != '/'))
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return GRUB_ERR_NONE;
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rest = *name + flen;
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lastslash = rest;
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if (*rest)
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rest++;
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while (lastslash >= *name && *lastslash != '/')
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lastslash--;
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if (lastslash >= *name)
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prefixlen = lastslash - *name;
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else
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prefixlen = 0;
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if (prefixlen)
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prefixlen++;
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#ifdef MODE_USTAR
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size = grub_strlen (data->linkname);
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#else
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size = data->size;
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#endif
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if (size == 0)
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return GRUB_ERR_NONE;
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target = grub_malloc (size + grub_strlen (*name) + 2);
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if (!target)
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return grub_errno;
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#ifdef MODE_USTAR
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grub_memcpy (target + prefixlen, data->linkname, size);
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#else
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err = grub_disk_read (data->disk, 0, data->dofs, data->size,
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target + prefixlen);
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if (err)
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return err;
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#endif
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if (target[prefixlen] == '/')
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{
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grub_memmove (target, target + prefixlen, data->size - 1);
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ptr = target + data->size - 1;
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ptr = grub_stpcpy (ptr, rest);
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*ptr = 0;
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grub_dprintf ("cpio", "symlink redirected %s to %s\n",
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*name, target);
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grub_free (*name);
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*name = target;
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*restart = 1;
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return GRUB_ERR_NONE;
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}
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if (prefixlen)
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{
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grub_memcpy (target, *name, prefixlen);
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target[prefixlen] = '/';
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}
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ptr = target + prefixlen + size;
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ptr = grub_stpcpy (ptr, rest);
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*ptr = 0;
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grub_dprintf ("cpio", "symlink redirected %s to %s\n",
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*name, target);
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grub_free (*name);
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*name = target;
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*restart = 1;
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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grub_cpio_dir (grub_device_t device, const char *path_in,
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int (*hook) (const char *filename,
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const struct grub_dirhook_info *info))
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{
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struct grub_cpio_data *data;
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grub_disk_addr_t ofs;
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char *prev, *name, *path, *ptr;
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grub_size_t len;
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int symlinknest = 0;
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path = grub_strdup (path_in + 1);
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if (!path)
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return grub_errno;
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for (ptr = path + grub_strlen (path) - 1; ptr >= path && *ptr == '/'; ptr--)
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*ptr = 0;
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grub_dl_ref (my_mod);
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prev = 0;
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data = grub_cpio_mount (device->disk);
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if (!data)
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{
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grub_free (path);
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return grub_errno;
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}
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|
|
len = grub_strlen (path);
|
|
data->hofs = 0;
|
|
while (1)
|
|
{
|
|
grub_int32_t mtime;
|
|
grub_uint32_t mode;
|
|
grub_err_t err;
|
|
|
|
if (grub_cpio_find_file (data, &name, &mtime, &ofs, &mode))
|
|
goto fail;
|
|
|
|
if (!ofs)
|
|
break;
|
|
|
|
if (grub_memcmp (path, name, len) == 0
|
|
&& (name[len] == 0 || name[len] == '/' || len == 0))
|
|
{
|
|
char *p, *n;
|
|
|
|
n = name + len;
|
|
while (*n == '/')
|
|
n++;
|
|
|
|
p = grub_strchr (n, '/');
|
|
if (p)
|
|
*p = 0;
|
|
|
|
if (((!prev) || (grub_strcmp (prev, n) != 0)) && *n != 0)
|
|
{
|
|
struct grub_dirhook_info info;
|
|
grub_memset (&info, 0, sizeof (info));
|
|
info.dir = (p != NULL);
|
|
info.mtime = mtime;
|
|
info.mtimeset = 1;
|
|
|
|
if (hook (n, &info))
|
|
goto fail;
|
|
grub_free (prev);
|
|
prev = name;
|
|
}
|
|
else
|
|
{
|
|
int restart;
|
|
err = handle_symlink (data, name, &path, mode, &restart);
|
|
grub_free (name);
|
|
if (err)
|
|
goto fail;
|
|
if (restart)
|
|
{
|
|
len = grub_strlen (path);
|
|
if (++symlinknest == 8)
|
|
{
|
|
grub_error (GRUB_ERR_SYMLINK_LOOP,
|
|
"too deep nesting of symlinks");
|
|
goto fail;
|
|
}
|
|
ofs = 0;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
grub_free (name);
|
|
data->hofs = ofs;
|
|
}
|
|
|
|
fail:
|
|
|
|
grub_free (path);
|
|
grub_free (prev);
|
|
#ifdef MODE_USTAR
|
|
grub_free (data->linkname);
|
|
#endif
|
|
grub_free (data);
|
|
|
|
grub_dl_unref (my_mod);
|
|
|
|
return grub_errno;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_cpio_open (grub_file_t file, const char *name_in)
|
|
{
|
|
struct grub_cpio_data *data;
|
|
grub_disk_addr_t ofs;
|
|
char *fn;
|
|
char *name = grub_strdup (name_in + 1);
|
|
int symlinknest = 0;
|
|
|
|
if (!name)
|
|
return grub_errno;
|
|
|
|
grub_dl_ref (my_mod);
|
|
|
|
data = grub_cpio_mount (file->device->disk);
|
|
if (!data)
|
|
{
|
|
grub_free (name);
|
|
return grub_errno;
|
|
}
|
|
|
|
data->hofs = 0;
|
|
while (1)
|
|
{
|
|
grub_uint32_t mode;
|
|
int restart;
|
|
|
|
if (grub_cpio_find_file (data, &fn, NULL, &ofs, &mode))
|
|
goto fail;
|
|
|
|
if (!ofs)
|
|
{
|
|
grub_error (GRUB_ERR_FILE_NOT_FOUND, "file not found");
|
|
break;
|
|
}
|
|
|
|
if (handle_symlink (data, fn, &name, mode, &restart))
|
|
{
|
|
grub_free (fn);
|
|
goto fail;
|
|
}
|
|
|
|
if (restart)
|
|
{
|
|
ofs = 0;
|
|
if (++symlinknest == 8)
|
|
{
|
|
grub_error (GRUB_ERR_SYMLINK_LOOP,
|
|
"too deep nesting of symlinks");
|
|
goto fail;
|
|
}
|
|
goto no_match;
|
|
}
|
|
|
|
if (grub_strcmp (name, fn) != 0)
|
|
goto no_match;
|
|
|
|
file->data = data;
|
|
file->size = data->size;
|
|
grub_free (fn);
|
|
grub_free (name);
|
|
|
|
return GRUB_ERR_NONE;
|
|
|
|
no_match:
|
|
|
|
grub_free (fn);
|
|
data->hofs = ofs;
|
|
}
|
|
|
|
fail:
|
|
#ifdef MODE_USTAR
|
|
grub_free (data->linkname);
|
|
#endif
|
|
grub_free (data);
|
|
grub_free (name);
|
|
|
|
grub_dl_unref (my_mod);
|
|
|
|
return grub_errno;
|
|
}
|
|
|
|
static grub_ssize_t
|
|
grub_cpio_read (grub_file_t file, char *buf, grub_size_t len)
|
|
{
|
|
struct grub_cpio_data *data;
|
|
|
|
data = file->data;
|
|
return (grub_disk_read (data->disk, 0, data->dofs + file->offset,
|
|
len, buf)) ? -1 : (grub_ssize_t) len;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_cpio_close (grub_file_t file)
|
|
{
|
|
struct grub_cpio_data *data;
|
|
|
|
data = file->data;
|
|
#ifdef MODE_USTAR
|
|
grub_free (data->linkname);
|
|
#endif
|
|
grub_free (data);
|
|
|
|
grub_dl_unref (my_mod);
|
|
|
|
return grub_errno;
|
|
}
|
|
|
|
static struct grub_fs grub_cpio_fs = {
|
|
#ifdef MODE_USTAR
|
|
.name = "tarfs",
|
|
#elif defined (MODE_ODC)
|
|
.name = "odc",
|
|
#elif defined (MODE_NEWC)
|
|
.name = "newc",
|
|
#else
|
|
.name = "cpiofs",
|
|
#endif
|
|
.dir = grub_cpio_dir,
|
|
.open = grub_cpio_open,
|
|
.read = grub_cpio_read,
|
|
.close = grub_cpio_close,
|
|
#ifdef GRUB_UTIL
|
|
.reserved_first_sector = 0,
|
|
#endif
|
|
};
|
|
|
|
#ifdef MODE_USTAR
|
|
GRUB_MOD_INIT (tar)
|
|
#elif defined (MODE_ODC)
|
|
GRUB_MOD_INIT (odc)
|
|
#elif defined (MODE_NEWC)
|
|
GRUB_MOD_INIT (newc)
|
|
#else
|
|
GRUB_MOD_INIT (cpio)
|
|
#endif
|
|
{
|
|
grub_fs_register (&grub_cpio_fs);
|
|
my_mod = mod;
|
|
}
|
|
|
|
#ifdef MODE_USTAR
|
|
GRUB_MOD_FINI (tar)
|
|
#elif defined (MODE_ODC)
|
|
GRUB_MOD_FINI (odc)
|
|
#elif defined (MODE_NEWC)
|
|
GRUB_MOD_FINI (newc)
|
|
#else
|
|
GRUB_MOD_FINI (cpio)
|
|
#endif
|
|
{
|
|
grub_fs_unregister (&grub_cpio_fs);
|
|
}
|