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authorChristophe Grenier <grenier@cgsecurity.org>2015-09-17 20:55:11 +0200
committerChristophe Grenier <grenier@cgsecurity.org>2015-09-17 20:55:11 +0200
commitebf01db331b22f7e10c6470ac72e2dfd38b35a75 (patch)
tree6bd02d9ac337a20f9ce56f5c63d87b3e1d88c8ff /src/file_ibd.c
parent393b63c9984696229083e2fd1e97aeb57106eb60 (diff)
PhotoRec: recover InnoDB .ibd database file
Diffstat (limited to 'src/file_ibd.c')
-rw-r--r--src/file_ibd.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/src/file_ibd.c b/src/file_ibd.c
new file mode 100644
index 0000000..1129149
--- /dev/null
+++ b/src/file_ibd.c
@@ -0,0 +1,106 @@
+/*
+
+ File: file_ibd.c
+
+ Copyright (C) 2015 Christophe GRENIER <grenier@cgsecurity.org>
+
+ This software 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 2 of the License, or
+ (at your option) any later version.
+
+ This program 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 this program; if not, write the Free Software Foundation, Inc., 51
+ Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+#include <stdio.h>
+#include "types.h"
+#include "filegen.h"
+#include "common.h"
+#include "log.h"
+
+static void register_header_check_ibd(file_stat_t *file_stat);
+
+const file_hint_t file_hint_ibd= {
+ .extension="ibd",
+ .description="InnoDB database file",
+ .max_filesize=PHOTOREC_MAX_FILE_SIZE,
+ .recover=1,
+ .enable_by_default=1,
+ .register_header_check=&register_header_check_ibd
+};
+
+#define FSP_HEADER_OFFSET 38
+#define FSP_SPACE_FLAGS 16 /* fsp_space_t.flags, similar to dict_table_t::flags */
+#define FIL_PAGE_TYPE_FSP_HDR 8 /* File space header */
+#define DICT_TF_BITS 6 /* number of flag bits */
+#define DICT_TF_FORMAT_SHIFT 5 /* file format */
+#define DICT_TF_FORMAT_MASK \
+ ((~(~0 << (DICT_TF_BITS - DICT_TF_FORMAT_SHIFT))) << DICT_TF_FORMAT_SHIFT)
+
+#define DICT_TF_FORMAT_ZIP 1 /* InnoDB plugin for 5.1: compressed tables */
+
+struct innodb_fil_header
+{
+ uint32_t space_or_chksum;
+ uint32_t offset;
+ uint32_t prev;
+ uint32_t next;
+ uint64_t lsn;
+ uint16_t type;
+ uint64_t file_flush_lsn;
+ uint32_t arch_log_no_or_space_id;
+} __attribute__ ((gcc_struct, __packed__));
+
+static int header_check_ibd(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new)
+{
+ const struct innodb_fil_header *hdr=(const struct innodb_fil_header *)buffer;
+ const uint32_t *flags_ptr=(const uint32_t *)&buffer[FSP_HEADER_OFFSET + FSP_SPACE_FLAGS];
+ const uint32_t flags=be32(*flags_ptr);
+ if(be16(hdr->type)==0)
+ {
+ /* Antelope (pre-5.1.7) */
+ if(flags==0)
+ return 0;
+ }
+ else if(be16(hdr->type)==FIL_PAGE_TYPE_FSP_HDR)
+ {
+ const unsigned int format = flags & DICT_TF_FORMAT_MASK >> DICT_TF_FORMAT_SHIFT;
+ if(flags==0)
+ {
+ /* Antelope (5.1.7 or newer) */
+ }
+ else if(format==DICT_TF_FORMAT_ZIP)
+ {
+ /* Barracuda */
+ }
+ else
+ return 0;
+ }
+ else
+ return 0;
+ if(buffer_size >= 0xc078 && memcmp(&buffer[0xc070], "supremum", 8)!=0)
+ return 0;
+ reset_file_recovery(file_recovery_new);
+ file_recovery_new->extension=file_hint_ibd.extension;
+ file_recovery_new->min_filesize=0xc078;
+ return 1;
+}
+
+static void register_header_check_ibd(file_stat_t *file_stat)
+{
+ register_header_check(0xc063, "infimum", 7, &header_check_ibd, file_stat);
+}