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authorChristophe Grenier <grenier@cgsecurity.org>2009-09-03 08:14:03 +0200
committerChristophe Grenier <grenier@cgsecurity.org>2009-09-03 08:14:03 +0200
commit34b943e8813aa52361169a63e3335f6bf15a5277 (patch)
tree4179df88255ad82679f97bad5dc2f72641607b8c /src/file_bac.c
parent5e5828c170d5b83dcdbe088d21dab201f0406f98 (diff)
PhotoRec: recover Bacula backup .bac and Qemu image .cow (COW and COW2)
Diffstat (limited to 'src/file_bac.c')
-rw-r--r--src/file_bac.c97
1 files changed, 97 insertions, 0 deletions
diff --git a/src/file_bac.c b/src/file_bac.c
new file mode 100644
index 0000000..e7a6191
--- /dev/null
+++ b/src/file_bac.c
@@ -0,0 +1,97 @@
+/*
+
+ File: file_bac.c
+
+ Copyright (C) 2009 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"
+#include "memmem.h"
+
+static void register_header_check_bac(file_stat_t *file_stat);
+static int header_check_bac(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);
+static int data_check_bac(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery);
+
+const file_hint_t file_hint_bac= {
+ .extension="bac",
+ .description="Bacula backup",
+ .min_header_distance=0,
+ .max_filesize=PHOTOREC_MAX_FILE_SIZE,
+ .recover=1,
+ .enable_by_default=1,
+ .register_header_check=&register_header_check_bac
+};
+
+static const unsigned char bac_header[8]={ 0, 0, 0, 0, 'B', 'B', '0', '2' };
+static void register_header_check_bac(file_stat_t *file_stat)
+{
+ register_header_check(8, bac_header, sizeof(bac_header), &header_check_bac, file_stat);
+}
+
+static int header_check_bac(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)
+{
+ if(memcmp(&buffer[8], bac_header, sizeof(bac_header))==0)
+ {
+ reset_file_recovery(file_recovery_new);
+ file_recovery_new->extension=file_hint_bac.extension;
+ file_recovery_new->data_check=data_check_bac;
+ file_recovery_new->file_check=&file_check_size;
+ file_recovery_new->calculated_file_size=0;
+ return 1;
+ }
+ return 0;
+}
+
+static int data_check_bac(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
+{
+ while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
+ file_recovery->calculated_file_size + 0x18 < file_recovery->file_size + buffer_size/2)
+ {
+ const unsigned int i=file_recovery->calculated_file_size - file_recovery->file_size + buffer_size/2;
+ const unsigned int block_size=(buffer[i+4]<<24)|(buffer[i+5]<<16)|(buffer[i+6]<<8)|buffer[i+7];
+#ifdef DEBUG_BACULA
+ const unsigned int block_nbr=(buffer[i+8]<<24)|(buffer[i+9]<<16)|(buffer[i+10]<<8)|buffer[i+11];
+ log_trace("file_bac.c: block %u size %u, calculated_file_size %llu\n",
+ block_nbr, block_size,
+ (long long unsigned)file_recovery->calculated_file_size);
+#endif
+ if(memcmp(&buffer[i+12], "BB02", 4)!=0 || block_size<0x18)
+ {
+ log_error("file_bac.c: invalid block at %llu\n",
+ (long long unsigned)file_recovery->calculated_file_size);
+ return 2;
+ }
+ file_recovery->calculated_file_size+=(uint64_t)block_size;
+ }
+#ifdef DEBUG_BACULA
+ log_trace("file_bac.c: new calculated_file_size %llu\n",
+ (long long unsigned)file_recovery->calculated_file_size);
+#endif
+ return 1;
+}
+