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-rw-r--r--src/f2fs.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/src/f2fs.c b/src/f2fs.c
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+++ b/src/f2fs.c
@@ -0,0 +1,101 @@
+/*
+
+ File: f2fs.c
+
+ Copyright (C) 2018 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_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+#include <stdio.h>
+#include "types.h"
+#include "common.h"
+#include "f2fs_fs.h"
+#include "f2fs.h"
+#include "log.h"
+
+extern const arch_fnct_t arch_none;
+
+static void set_f2fs_info(partition_t *partition, const struct f2fs_super_block*hdr)
+{
+ partition->upart_type=UP_F2FS;
+ partition->blocksize=1<<le32(hdr->log_blocksize);
+ partition->fsname[0]='\0';
+ if(partition->sb_offset==0)
+ snprintf(partition->info, sizeof(partition->info), "F2FS, blocksize=%u", partition->blocksize);
+ else
+ snprintf(partition->info, sizeof(partition->info), "F2FS found using backup sector, blocksize=%u", partition->blocksize);
+}
+
+int check_f2fs(disk_t *disk, partition_t *partition)
+{
+ unsigned char *buffer=(unsigned char*)MALLOC(F2FS_BLKSIZE);
+ if(disk->pread(disk, buffer, F2FS_BLKSIZE, partition->part_offset + F2FS_SUPER_OFFSET) != F2FS_BLKSIZE)
+ {
+ free(buffer);
+ return 1;
+ }
+ if(test_f2fs((struct f2fs_super_block*)buffer)!=0)
+ {
+ free(buffer);
+ return 1;
+ }
+ set_f2fs_info(partition, (struct f2fs_super_block*)buffer);
+ free(buffer);
+ return 0;
+}
+
+int test_f2fs(const struct f2fs_super_block *hdr)
+{
+ if(le32(hdr->magic) != F2FS_SUPER_MAGIC)
+ return 1;
+ /* Currently, support 512/1024/2048/4096 bytes sector size */
+ if(le32(hdr->log_sectorsize) < 9 || le32(hdr->log_sectorsize) > 12)
+ return 1;
+ /* Currently, support only 4KB block size */
+ if(le32(hdr->log_blocksize) != F2FS_BLKSIZE_BITS)
+ return 1;
+ if(le32(hdr->log_sectorsize) + le32(hdr->log_sectors_per_block) != le32(hdr->log_blocksize))
+ return 1;
+ /* check log blocks per segment */
+ if(le32(hdr->log_blocks_per_seg) != 9)
+ return 1;
+ if(le64(hdr->block_count) == 0)
+ return 1;
+ return 0;
+}
+
+int recover_f2fs(const disk_t *disk, const struct f2fs_super_block *hdr, partition_t *partition)
+{
+ if(test_f2fs(hdr)!=0)
+ return 1;
+ partition->sborg_offset=0;
+ partition->sb_size=F2FS_BLKSIZE;
+ partition->part_type_i386=P_LINUX;
+ partition->part_type_gpt=GPT_ENT_TYPE_MS_BASIC_DATA;
+ partition->part_size=(uint64_t)le64(hdr->block_count) << le32(hdr->log_blocksize);
+ set_f2fs_info(partition, hdr);
+ return 0;
+}