153 lines
4.9 KiB
Rust
153 lines
4.9 KiB
Rust
//! *catar* binary format definition
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//!
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//! Please note the all values are stored in little endian ordering.
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//!
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//! The Archive contains a list of items. Each item starts with a
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//! `CaFormatHeader`, followed by the item data.
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use failure::*;
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use endian_trait::Endian;
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use siphasher::sip::SipHasher24;
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pub const CA_FORMAT_ENTRY: u64 = 0x1396fabcea5bbb51;
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pub const CA_FORMAT_FILENAME: u64 = 0x6dbb6ebcb3161f0b;
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pub const CA_FORMAT_SYMLINK: u64 = 0x664a6fb6830e0d6c;
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pub const CA_FORMAT_PAYLOAD: u64 = 0x8b9e1d93d6dcffc9;
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pub const CA_FORMAT_GOODBYE: u64 = 0xdfd35c5e8327c403;
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/* The end marker used in the GOODBYE object */
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pub const CA_FORMAT_GOODBYE_TAIL_MARKER: u64 = 0x57446fa533702943;
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// Feature flags
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// DOS file flags
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pub const CA_FORMAT_WITH_FLAG_HIDDEN: u64 = 0x2000;
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pub const CA_FORMAT_WITH_FLAG_SYSTEM: u64 = 0x4000;
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pub const CA_FORMAT_WITH_FLAG_ARCHIVE: u64 = 0x8000;
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// chattr() flags
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pub const CA_FORMAT_WITH_FLAG_APPEND: u64 = 0x10000;
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pub const CA_FORMAT_WITH_FLAG_NOATIME: u64 = 0x20000;
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pub const CA_FORMAT_WITH_FLAG_COMPR: u64 = 0x40000;
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pub const CA_FORMAT_WITH_FLAG_NOCOW: u64 = 0x80000;
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pub const CA_FORMAT_WITH_FLAG_NODUMP: u64 = 0x100000;
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pub const CA_FORMAT_WITH_FLAG_DIRSYNC: u64 = 0x200000;
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pub const CA_FORMAT_WITH_FLAG_IMMUTABLE: u64 = 0x400000;
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pub const CA_FORMAT_WITH_FLAG_SYNC: u64 = 0x800000;
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pub const CA_FORMAT_WITH_FLAG_NOCOMP: u64 = 0x1000000;
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pub const CA_FORMAT_WITH_FLAG_PROJINHERIT: u64 = 0x2000000;
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pub const CA_FORMAT_FEATURE_FLAGS_MAX: u64 = 0xb000_0001_ffef_fe26; // fixme: ?
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#[derive(Endian,Clone)]
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#[repr(C)]
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pub struct CaFormatHeader {
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/// The size of the item, including the size of `CaFormatHeader`.
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pub size: u64,
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/// The item type (see `CA_FORMAT_` constants).
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pub htype: u64,
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}
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#[derive(Endian,Clone)]
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#[repr(C)]
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pub struct CaFormatEntry {
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pub feature_flags: u64,
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pub mode: u64,
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pub flags: u64,
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pub uid: u64,
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pub gid: u64,
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pub mtime: u64,
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}
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#[derive(Endian)]
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#[repr(C)]
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pub struct CaFormatGoodbyeItem {
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/// The offset from the start of the GOODBYE object to the start
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/// of the matching directory item (point to a FILENAME). The last
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/// GOODBYE item points to the start of the matching ENTRY
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/// object.
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pub offset: u64,
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/// The overall size of the directory item. The last GOODBYE item
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/// repeats the size of the GOODBYE item.
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pub size: u64,
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/// SipHash24 of the directory item name. The last GOODBYE item
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/// uses the special hash value `CA_FORMAT_GOODBYE_TAIL_MARKER`.
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pub hash: u64,
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}
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/// Helper function to extract file names from binary archive.
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pub fn read_os_string(buffer: &[u8]) -> std::ffi::OsString {
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let len = buffer.len();
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use std::os::unix::ffi::OsStrExt;
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let name = if len > 0 && buffer[len-1] == 0 {
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std::ffi::OsStr::from_bytes(&buffer[0..len-1])
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} else {
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std::ffi::OsStr::from_bytes(&buffer)
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};
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name.into()
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}
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/// Create SipHash values for goodby tables.
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//pub fn compute_goodbye_hash(name: &std::ffi::CStr) -> u64 {
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pub fn compute_goodbye_hash(name: &[u8]) -> u64 {
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use std::hash::Hasher;
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let mut hasher = SipHasher24::new_with_keys(0x8574442b0f1d84b3, 0x2736ed30d1c22ec1);
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hasher.write(name);
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hasher.finish()
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}
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pub fn check_ca_header<T>(head: &CaFormatHeader, htype: u64) -> Result<(), Error> {
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if head.htype != htype {
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bail!("got wrong header type ({:016x} != {:016x}", head.htype, htype);
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}
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if head.size != (std::mem::size_of::<T>() + std::mem::size_of::<CaFormatHeader>()) as u64 {
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bail!("got wrong header size for type {:016x}", htype);
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}
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Ok(())
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}
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// form /usr/include/linux/fs.h
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const FS_APPEND_FL: u32 = 0x00000020;
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const FS_NOATIME_FL: u32 = 0x00000080;
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const FS_COMPR_FL: u32 = 0x00000004;
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const FS_NOCOW_FL: u32 = 0x00800000;
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const FS_NODUMP_FL: u32 = 0x00000040;
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const FS_DIRSYNC_FL: u32 = 0x00010000;
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const FS_IMMUTABLE_FL: u32 = 0x00000010;
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const FS_SYNC_FL: u32 = 0x00000008;
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const FS_NOCOMP_FL: u32 = 0x00000400;
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const FS_PROJINHERIT_FL: u32 = 0x20000000;
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static CHATTR_MAP: [(u64, u32); 10] = [
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( CA_FORMAT_WITH_FLAG_APPEND, FS_APPEND_FL ),
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( CA_FORMAT_WITH_FLAG_NOATIME, FS_NOATIME_FL ),
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( CA_FORMAT_WITH_FLAG_COMPR, FS_COMPR_FL ),
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( CA_FORMAT_WITH_FLAG_NOCOW, FS_NOCOW_FL ),
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( CA_FORMAT_WITH_FLAG_NODUMP, FS_NODUMP_FL ),
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( CA_FORMAT_WITH_FLAG_DIRSYNC, FS_DIRSYNC_FL ),
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( CA_FORMAT_WITH_FLAG_IMMUTABLE, FS_IMMUTABLE_FL ),
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( CA_FORMAT_WITH_FLAG_SYNC, FS_SYNC_FL ),
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( CA_FORMAT_WITH_FLAG_NOCOMP, FS_NOCOMP_FL ),
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( CA_FORMAT_WITH_FLAG_PROJINHERIT, FS_PROJINHERIT_FL ),
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];
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pub fn ca_feature_flags_from_chattr(attr: u32) -> u64 {
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let mut flags = 0u64;
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for (ca_flag, fs_flag) in &CHATTR_MAP {
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if (attr & fs_flag) != 0 { flags = flags | ca_flag; }
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}
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flags
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}
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