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authorChristophe Grenier <grenier@cgsecurity.org>2012-08-15 12:15:38 +0200
committerChristophe Grenier <grenier@cgsecurity.org>2012-08-15 12:15:38 +0200
commit45b3584afa42b004498ab230a4f466054d3b58ce (patch)
tree108d79335d72c2457150917ead6b8861604af0fc /src/file_mig.c
parent4d2697cdaca2ead182c81464d10ec3e5e4536801 (diff)
PhotoRec: recover Windows Migration Backup .mig files
Diffstat (limited to 'src/file_mig.c')
-rw-r--r--src/file_mig.c110
1 files changed, 110 insertions, 0 deletions
diff --git a/src/file_mig.c b/src/file_mig.c
new file mode 100644
index 0000000..9e00288
--- /dev/null
+++ b/src/file_mig.c
@@ -0,0 +1,110 @@
+/*
+
+ File: file_mig.c
+
+ Copyright (C) 2012 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"
+#ifdef DEBUG_MIG
+#include "log.h"
+#endif
+
+static void register_header_check_mig(file_stat_t *file_stat);
+
+const file_hint_t file_hint_mig= {
+ .extension="mig",
+ .description="Windows Migration Backup",
+ .min_header_distance=0,
+ .max_filesize=PHOTOREC_MAX_FILE_SIZE,
+ .recover=1,
+ .enable_by_default=1,
+ .register_header_check=&register_header_check_mig
+};
+
+struct MIG_HDR
+{
+ uint32_t magic;
+ uint32_t fn_size;
+ uint32_t s_size;
+ uint32_t unk1;
+ uint32_t unk2;
+ uint32_t unk3;
+ unsigned char fn[0];
+} __attribute__ ((__packed__));
+
+static void file_check_mig(file_recovery_t *file_recovery)
+{
+ struct MIG_HDR h;
+ uint64_t offset=0x34;
+ file_recovery->file_size=0;
+ while(1)
+ {
+ if(fseek(file_recovery->handle, offset, SEEK_SET) < 0 ||
+ fread(&h, sizeof(h), 1, file_recovery->handle) != 1)
+ {
+#ifdef DEBUG_MIG
+ log_info("0x%lx no header\n", (long unsigned)offset);
+#endif
+ return ;
+ }
+ if(le32(h.magic)!=0x5354524d) /* STRM=stream */
+ {
+#ifdef DEBUG_MIG
+ log_info("0x%lx no magic %x\n", (long unsigned)offset, le32(h.magic));
+#endif
+ file_recovery->file_size=offset+8;
+ return ;
+ }
+#ifdef DEBUG_MIG
+ log_info("0x%lx magic s_size=0x%u\n", (long unsigned)offset, le32(h.s_size));
+#endif
+ offset+=sizeof(h)+le32(h.s_size);
+ }
+}
+
+static const unsigned char mig_header[8]= {
+ '1' , 'g' , 'i' , 'M' , 0x02, 0x00, 0x00, 0x00
+};
+
+static int header_check_mig(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[0], mig_header, sizeof(mig_header))==0 &&
+ memcmp(&buffer[0x34], "MRTS", 4)==0)
+ {
+ reset_file_recovery(file_recovery_new);
+ file_recovery_new->extension=file_hint_mig.extension;
+ file_recovery_new->file_check=&file_check_mig;
+ return 1;
+ }
+ return 0;
+}
+
+static void register_header_check_mig(file_stat_t *file_stat)
+{
+ register_header_check(0, mig_header, sizeof(mig_header), &header_check_mig, file_stat);
+}