dissect.jffs.c_jffs2#
Module Contents#
- dissect.jffs.c_jffs2.jffs2_def = Multiline-String#
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""" /* these are defined by POSIX and also present in glibc's dirent.h */ #define DT_UNKNOWN 0 #define DT_FIFO 1 #define DT_CHR 2 #define DT_DIR 4 #define DT_BLK 6 #define DT_REG 8 #define DT_LNK 10 #define DT_SOCK 12 #define DT_WHT 14 /* Values we may expect to find in the 'magic' field */ #define JFFS2_OLD_MAGIC_BITMASK 0x1984 #define JFFS2_MAGIC_BITMASK 0x1985 #define KSAMTIB_CIGAM_2SFFJ 0x8519 /* For detecting wrong-endian fs */ #define JFFS2_EMPTY_BITMASK 0xffff #define JFFS2_DIRTY_BITMASK 0x0000 /* Summary node MAGIC marker */ #define JFFS2_SUM_MAGIC 0x02851885 /* We only allow a single char for length, and 0xFF is empty flash so we don't want it confused with a real length. Hence max 254. */ #define JFFS2_MAX_NAME_LEN 254 /* How small can we sensibly write nodes? */ #define JFFS2_MIN_DATA_LEN 128 #define JFFS2_COMPR_NONE 0x00 #define JFFS2_COMPR_ZERO 0x01 /* All data in such an inode should be 0x00 */ #define JFFS2_COMPR_RTIME 0x02 /* https://github.com/torvalds/linux/blob/master/fs/jffs2/compr_rtime.c */ #define JFFS2_COMPR_RUBINMIPS 0x03 /* Deprecated. */ #define JFFS2_COMPR_COPY 0x04 /* Never implemented. */ #define JFFS2_COMPR_DYNRUBIN 0x05 /* https://github.com/torvalds/linux/blob/master/fs/jffs2/compr_rubin.c */ #define JFFS2_COMPR_ZLIB 0x06 #define JFFS2_COMPR_LZO 0x07 /* Compatibility flags. */ #define JFFS2_COMPAT_MASK 0xc000 /* What do to if an unknown nodetype is found */ #define JFFS2_NODE_ACCURATE 0x2000 /* INCOMPAT: Fail to mount the filesystem */ #define JFFS2_FEATURE_INCOMPAT 0xc000 /* ROCOMPAT: Mount read-only */ #define JFFS2_FEATURE_ROCOMPAT 0x8000 /* RWCOMPAT_COPY: Mount read/write, and copy the node when it's GC'd */ #define JFFS2_FEATURE_RWCOMPAT_COPY 0x4000 /* RWCOMPAT_DELETE: Mount read/write, and delete the node when it's GC'd */ #define JFFS2_FEATURE_RWCOMPAT_DELETE 0x0000 #define JFFS2_NODETYPE_DIRENT (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 1) #define JFFS2_NODETYPE_INODE (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 2) #define JFFS2_NODETYPE_CLEANMARKER (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3) #define JFFS2_NODETYPE_PADDING (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 4) #define JFFS2_NODETYPE_SUMMARY (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 6) #define JFFS2_NODETYPE_XATTR (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 8) #define JFFS2_NODETYPE_XREF (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 9) /* XATTR Related */ #define JFFS2_XPREFIX_USER 1 /* for "user." */ #define JFFS2_XPREFIX_SECURITY 2 /* for "security." */ #define JFFS2_XPREFIX_ACL_ACCESS 3 /* for "system.posix_acl_access" */ #define JFFS2_XPREFIX_ACL_DEFAULT 4 /* for "system.posix_acl_default" */ #define JFFS2_XPREFIX_TRUSTED 5 /* for "trusted.*" */ #define JFFS2_ACL_VERSION 0x0001 #define JFFS2_INO_FLAG_PREREAD 1 /* Do read_inode() for this one at mount time, don't wait for it to happen later */ #define JFFS2_INO_FLAG_USERCOMPR 2 /* User has requested a specific compression type */ struct jffs2_unknown_node { /* All start like this */ uint16 magic; uint16 nodetype; uint32 totlen; /* So we can skip over nodes we don't grok */ uint32 hdr_crc; }; struct jffs2_raw_dirent { uint16 magic; uint16 nodetype; /* == JFFS2_NODETYPE_DIRENT */ uint32 totlen; uint32 hdr_crc; uint32 pino; uint32 version; uint32 ino; /* == zero for unlink */ uint32 mctime; uint8 nsize; uint8 type; uint8 unused[2]; uint32 node_crc; uint32 name_crc; char name[nsize]; }; /* The JFFS2 raw inode structure: Used for storage on physical media. */ /* The uid, gid, atime, mtime and ctime members could be longer, but are left like this for space efficiency. If and when people decide they really need them extended, it's simple enough to add support for a new type of raw node. */ struct jffs2_raw_inode { uint16 magic; /* A constant magic number. */ uint16 nodetype; /* == JFFS2_NODETYPE_INODE */ uint32 totlen; /* Total length of this node (inc data, etc.) */ uint32 hdr_crc; uint32 ino; /* Inode number. */ uint32 version; /* Version number. */ uint32 mode; /* The file's type or mode. */ uint16 uid; /* The file's owner. */ uint16 gid; /* The file's group. */ uint32 isize; /* Total resultant size of this inode (used for truncations) */ uint32 atime; /* Last access time. */ uint32 mtime; /* Last modification time. */ uint32 ctime; /* Change time. */ uint32 offset; /* Where to begin to write. */ uint32 csize; /* (Compressed) data size */ uint32 dsize; /* Size of the node's data. (after decompression) */ uint8 compr; /* Compression algorithm used */ uint8 usercompr; /* Compression algorithm requested by the user */ uint16 flags; /* See JFFS2_INO_FLAG_* */ uint32 data_crc; /* CRC for the (compressed) data. */ uint32 node_crc; /* CRC for the raw inode (excluding data) */ // char data[csize]; }; struct jffs2_raw_xattr { uint16 magic; uint16 nodetype; /* = JFFS2_NODETYPE_XATTR */ uint32 totlen; uint32 hdr_crc; uint32 xid; /* XATTR identifier number */ uint32 version; uint8 xprefix; uint8 name_len; uint16 value_len; uint32 data_crc; uint32 node_crc; uint8 data[0]; }; struct jffs2_raw_xref { uint16 magic; uint16 nodetype; /* = JFFS2_NODETYPE_XREF */ uint32 totlen; uint32 hdr_crc; uint32 ino; /* inode number */ uint32 xid; /* XATTR identifier number */ uint32 xseqno; /* xref sequential number */ uint32 node_crc; }; struct jffs2_raw_summary { uint16 magic; uint16 nodetype; /* = JFFS2_NODETYPE_SUMMARY */ uint32 totlen; uint32 hdr_crc; uint32 sum_num; /* number of sum entries*/ uint32 cln_mkr; /* clean marker size, 0 = no cleanmarker */ uint32 padded; /* sum of the size of padding nodes */ uint32 sum_crc; /* summary information crc */ uint32 node_crc; /* node crc */ uint32 sum[0]; /* inode summary info */ }; /* Data payload for device nodes. */ union jffs2_device_node { uint16 old_id; uint32 new_id; }; """
- dissect.jffs.c_jffs2.c_jffs2#
- dissect.jffs.c_jffs2.JFFS2_MAGIC_NUMBERS = ()#
- dissect.jffs.c_jffs2.DT_MAP#