src/pxar/decoder.rs: implement seekable decoder
This commit is contained in:
Dietmar Maurer
parent
0e21b87be3
commit
46cfe7ab7e
@ -48,3 +48,6 @@ pub use encoder::*;
|
||||
|
||||
mod sequential_decoder;
|
||||
pub use sequential_decoder::*;
|
||||
|
||||
mod decoder;
|
||||
pub use decoder::*;
|
||||
|
||||
288
src/pxar/decoder.rs
Normal file
288
src/pxar/decoder.rs
Normal file
@ -0,0 +1,288 @@
|
||||
//! *pxar* format decoder for seekable files
|
||||
//!
|
||||
//! This module contain the code to decode *pxar* archive files.
|
||||
|
||||
use failure::*;
|
||||
use endian_trait::Endian;
|
||||
|
||||
use super::format_definition::*;
|
||||
use super::sequential_decoder::*;
|
||||
use crate::tools;
|
||||
|
||||
use std::io::{Read, Write, Seek, SeekFrom};
|
||||
use std::path::{Path, PathBuf};
|
||||
|
||||
use std::os::unix::io::AsRawFd;
|
||||
use std::os::unix::io::RawFd;
|
||||
use std::os::unix::io::FromRawFd;
|
||||
use std::os::unix::ffi::{OsStrExt, OsStringExt};
|
||||
use std::ffi::{OsStr, OsString};
|
||||
|
||||
use nix::fcntl::OFlag;
|
||||
use nix::sys::stat::Mode;
|
||||
use nix::errno::Errno;
|
||||
use nix::NixPath;
|
||||
|
||||
pub struct CaDirectoryEntry {
|
||||
start: u64,
|
||||
end: u64,
|
||||
pub filename: OsString,
|
||||
pub entry: CaFormatEntry,
|
||||
}
|
||||
|
||||
// This one needs Read+Seek
|
||||
pub struct Decoder<'a, R: Read + Seek> {
|
||||
inner: SequentialDecoder<'a, R>,
|
||||
root_start: u64,
|
||||
root_end: u64,
|
||||
}
|
||||
|
||||
const HEADER_SIZE: u64 = std::mem::size_of::<CaFormatHeader>() as u64;
|
||||
|
||||
impl <'a, R: Read + Seek> Decoder<'a, R> {
|
||||
|
||||
pub fn new(reader: &'a mut R) -> Result<Self, Error> {
|
||||
|
||||
let root_end = reader.seek(SeekFrom::End(0))?;
|
||||
|
||||
Ok(Self {
|
||||
inner: SequentialDecoder::new(reader),
|
||||
root_start: 0,
|
||||
root_end: root_end,
|
||||
})
|
||||
}
|
||||
|
||||
pub fn root(&self) -> CaDirectoryEntry {
|
||||
CaDirectoryEntry {
|
||||
start: self.root_start,
|
||||
end: self.root_end,
|
||||
filename: OsString::new(), // Empty
|
||||
entry: CaFormatEntry {
|
||||
feature_flags: 0,
|
||||
mode: 0,
|
||||
flags: 0,
|
||||
uid: 0,
|
||||
gid: 0,
|
||||
mtime: 0,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn seek(&mut self, pos: SeekFrom) -> Result<u64, Error> {
|
||||
let pos = self.inner.get_reader_mut().seek(pos)?;
|
||||
Ok(pos)
|
||||
}
|
||||
|
||||
pub fn restore<F>(
|
||||
&mut self,
|
||||
dir: &CaDirectoryEntry,
|
||||
path: &Path,
|
||||
callback: F,
|
||||
) -> Result<(), Error>
|
||||
where F: Fn(&Path) -> Result<(), Error>
|
||||
{
|
||||
let start = dir.start;
|
||||
|
||||
self.seek(SeekFrom::Start(start))?;
|
||||
|
||||
self.inner.restore(path, &callback)?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn read_directory_entry(&mut self, start: u64, end: u64) -> Result<CaDirectoryEntry, Error> {
|
||||
|
||||
self.seek(SeekFrom::Start(start))?;
|
||||
|
||||
let head: CaFormatHeader = self.inner.read_item()?;
|
||||
|
||||
if head.htype != CA_FORMAT_FILENAME {
|
||||
bail!("wrong filename header type for object [{}..{}]", start, end);
|
||||
}
|
||||
|
||||
let entry_start = start + head.size;
|
||||
|
||||
let filename = self.inner.read_filename(head.size)?;
|
||||
|
||||
let head: CaFormatHeader = self.inner.read_item()?;
|
||||
check_ca_header::<CaFormatEntry>(&head, CA_FORMAT_ENTRY)?;
|
||||
let entry: CaFormatEntry = self.inner.read_item()?;
|
||||
|
||||
Ok(CaDirectoryEntry {
|
||||
start: entry_start,
|
||||
end: end,
|
||||
filename: filename,
|
||||
entry,
|
||||
})
|
||||
}
|
||||
|
||||
pub fn list_dir(&mut self, dir: &CaDirectoryEntry) -> Result<Vec<CaDirectoryEntry>, Error> {
|
||||
|
||||
const GOODBYE_ITEM_SIZE: u64 = std::mem::size_of::<CaFormatGoodbyeItem>() as u64;
|
||||
|
||||
let start = dir.start;
|
||||
let end = dir.end;
|
||||
|
||||
//println!("list_dir1: {} {}", start, end);
|
||||
|
||||
if (end - start) < (HEADER_SIZE + GOODBYE_ITEM_SIZE) {
|
||||
bail!("detected short object [{}..{}]", start, end);
|
||||
}
|
||||
|
||||
self.seek(SeekFrom::Start(end - GOODBYE_ITEM_SIZE))?;
|
||||
|
||||
let item: CaFormatGoodbyeItem = self.inner.read_item()?;
|
||||
|
||||
if item.hash != CA_FORMAT_GOODBYE_TAIL_MARKER {
|
||||
bail!("missing goodbye tail marker for object [{}..{}]", start, end);
|
||||
}
|
||||
|
||||
let goodbye_table_size = item.size;
|
||||
if goodbye_table_size < (HEADER_SIZE + GOODBYE_ITEM_SIZE) {
|
||||
bail!("short goodbye table size for object [{}..{}]", start, end);
|
||||
|
||||
}
|
||||
let goodbye_inner_size = goodbye_table_size - HEADER_SIZE - GOODBYE_ITEM_SIZE;
|
||||
if (goodbye_inner_size % GOODBYE_ITEM_SIZE) != 0 {
|
||||
bail!("wrong goodbye inner table size for entry [{}..{}]", start, end);
|
||||
}
|
||||
|
||||
let goodbye_start = end - goodbye_table_size;
|
||||
|
||||
if item.offset != (goodbye_start - start) {
|
||||
println!("DEBUG: {} {}", u64::from_le(item.offset), goodbye_start - start);
|
||||
bail!("wrong offset in goodbye tail marker for entry [{}..{}]", start, end);
|
||||
}
|
||||
|
||||
self.seek(SeekFrom::Start(goodbye_start))?;
|
||||
let head: CaFormatHeader = self.inner.read_item()?;
|
||||
|
||||
if head.htype != CA_FORMAT_GOODBYE {
|
||||
bail!("wrong goodbye table header type for entry [{}..{}]", start, end);
|
||||
}
|
||||
|
||||
if head.size != goodbye_table_size {
|
||||
bail!("wrong goodbye table size for entry [{}..{}]", start, end);
|
||||
}
|
||||
|
||||
let mut range_list = Vec::new();
|
||||
|
||||
for i in 0..goodbye_inner_size/GOODBYE_ITEM_SIZE {
|
||||
let item: CaFormatGoodbyeItem = self.inner.read_item()?;
|
||||
|
||||
if item.offset > (goodbye_start - start) {
|
||||
bail!("goodbye entry {} offset out of range [{}..{}] {} {} {}",
|
||||
i, start, end, item.offset, goodbye_start, start);
|
||||
}
|
||||
let item_start = goodbye_start - item.offset;
|
||||
let item_end = item_start + item.size;
|
||||
if item_end > goodbye_start {
|
||||
bail!("goodbye entry {} end out of range [{}..{}]",
|
||||
i, start, end);
|
||||
}
|
||||
|
||||
range_list.push((item_start, item_end));
|
||||
}
|
||||
|
||||
let mut result = vec![];
|
||||
|
||||
for (item_start, item_end) in range_list {
|
||||
let entry = self.read_directory_entry(item_start, item_end)?;
|
||||
//println!("ENTRY: {} {} {:?}", item_start, item_end, entry.filename);
|
||||
result.push(entry);
|
||||
}
|
||||
|
||||
Ok(result)
|
||||
}
|
||||
|
||||
pub fn print_filenames<W: std::io::Write>(
|
||||
&mut self,
|
||||
output: &mut W,
|
||||
prefix: &mut PathBuf,
|
||||
dir: &CaDirectoryEntry,
|
||||
) -> Result<(), Error> {
|
||||
|
||||
let mut list = self.list_dir(dir)?;
|
||||
|
||||
list.sort_unstable_by(|a, b| a.filename.cmp(&b.filename));
|
||||
|
||||
for item in &list {
|
||||
|
||||
prefix.push(item.filename.clone());
|
||||
|
||||
let mode = item.entry.mode as u32;
|
||||
|
||||
let ifmt = mode & libc::S_IFMT;
|
||||
|
||||
let osstr: &OsStr = prefix.as_ref();
|
||||
output.write(osstr.as_bytes())?;
|
||||
output.write(b"\n")?;
|
||||
|
||||
if ifmt == libc::S_IFDIR {
|
||||
self.print_filenames(output, prefix, item)?;
|
||||
} else if ifmt == libc::S_IFREG {
|
||||
} else if ifmt == libc::S_IFLNK {
|
||||
} else if ifmt == libc::S_IFBLK {
|
||||
} else if ifmt == libc::S_IFCHR {
|
||||
} else {
|
||||
bail!("unknown item mode/type for {:?}", prefix);
|
||||
}
|
||||
|
||||
prefix.pop();
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
fn file_openat(parent: RawFd, filename: &OsStr, flags: OFlag, mode: Mode) -> Result<std::fs::File, Error> {
|
||||
|
||||
let fd = filename.with_nix_path(|cstr| {
|
||||
nix::fcntl::openat(parent, cstr.as_ref(), flags, mode)
|
||||
})??;
|
||||
|
||||
let file = unsafe { std::fs::File::from_raw_fd(fd) };
|
||||
|
||||
Ok(file)
|
||||
}
|
||||
|
||||
fn dir_mkdirat(parent: RawFd, filename: &OsStr) -> Result<nix::dir::Dir, Error> {
|
||||
|
||||
// call mkdirat first
|
||||
let res = filename.with_nix_path(|cstr| unsafe {
|
||||
libc::mkdirat(parent, cstr.as_ptr(), libc::S_IRWXU)
|
||||
})?;
|
||||
Errno::result(res)?;
|
||||
|
||||
let dir = nix::dir::Dir::openat(parent, filename, OFlag::O_DIRECTORY, Mode::empty())?;
|
||||
|
||||
Ok(dir)
|
||||
}
|
||||
|
||||
fn symlinkat(target: &Path, parent: RawFd, linkname: &OsStr) -> Result<(), Error> {
|
||||
|
||||
target.with_nix_path(|target| {
|
||||
linkname.with_nix_path(|linkname| {
|
||||
let res = unsafe { libc::symlinkat(target.as_ptr(), parent, linkname.as_ptr()) };
|
||||
Errno::result(res)?;
|
||||
Ok(())
|
||||
})?
|
||||
})?
|
||||
}
|
||||
|
||||
fn nsec_to_update_timespec(mtime_nsec: u64) -> [libc::timespec; 2] {
|
||||
|
||||
// restore mtime
|
||||
const UTIME_OMIT: i64 = ((1 << 30) - 2);
|
||||
const NANOS_PER_SEC: i64 = 1_000_000_000;
|
||||
|
||||
let sec = (mtime_nsec as i64) / NANOS_PER_SEC;
|
||||
let nsec = (mtime_nsec as i64) % NANOS_PER_SEC;
|
||||
|
||||
let times: [libc::timespec; 2] = [
|
||||
libc::timespec { tv_sec: 0, tv_nsec: UTIME_OMIT },
|
||||
libc::timespec { tv_sec: sec, tv_nsec: nsec },
|
||||
];
|
||||
|
||||
times
|
||||
}
|
||||
@ -1,656 +0,0 @@
|
||||
//! *pxar* format decoder.
|
||||
//!
|
||||
//! This module contain the code to decode *pxar* archive files.
|
||||
|
||||
use failure::*;
|
||||
use endian_trait::Endian;
|
||||
|
||||
use super::format_definition::*;
|
||||
use crate::tools;
|
||||
|
||||
use std::io::{Read, Write, Seek, SeekFrom};
|
||||
use std::path::{Path, PathBuf};
|
||||
|
||||
use std::os::unix::io::AsRawFd;
|
||||
use std::os::unix::io::RawFd;
|
||||
use std::os::unix::io::FromRawFd;
|
||||
use std::os::unix::ffi::{OsStrExt, OsStringExt};
|
||||
use std::ffi::{OsStr, OsString};
|
||||
|
||||
use nix::fcntl::OFlag;
|
||||
use nix::sys::stat::Mode;
|
||||
use nix::errno::Errno;
|
||||
use nix::NixPath;
|
||||
|
||||
pub struct CaDirectoryEntry {
|
||||
start: u64,
|
||||
end: u64,
|
||||
pub filename: OsString,
|
||||
pub entry: CaFormatEntry,
|
||||
}
|
||||
|
||||
// This one needs Read+Seek (we may want one without Seek?)
|
||||
pub struct PxarDecoder<'a, R: Read + Seek> {
|
||||
reader: &'a mut R,
|
||||
root_start: u64,
|
||||
root_end: u64,
|
||||
}
|
||||
|
||||
const HEADER_SIZE: u64 = std::mem::size_of::<CaFormatHeader>() as u64;
|
||||
|
||||
impl <'a, R: Read + Seek> PxarDecoder<'a, R> {
|
||||
|
||||
pub fn new(reader: &'a mut R) -> Result<Self, Error> {
|
||||
|
||||
let root_end = reader.seek(SeekFrom::End(0))?;
|
||||
|
||||
Ok(Self {
|
||||
reader: reader,
|
||||
root_start: 0,
|
||||
root_end: root_end,
|
||||
})
|
||||
}
|
||||
|
||||
pub fn root(&self) -> CaDirectoryEntry {
|
||||
CaDirectoryEntry {
|
||||
start: self.root_start,
|
||||
end: self.root_end,
|
||||
filename: OsString::new(), // Empty
|
||||
entry: CaFormatEntry {
|
||||
feature_flags: 0,
|
||||
mode: 0,
|
||||
flags: 0,
|
||||
uid: 0,
|
||||
gid: 0,
|
||||
mtime: 0,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn read_item<T: Endian>(&mut self) -> Result<T, Error> {
|
||||
|
||||
let mut result: T = unsafe { std::mem::uninitialized() };
|
||||
|
||||
let buffer = unsafe { std::slice::from_raw_parts_mut(
|
||||
&mut result as *mut T as *mut u8,
|
||||
std::mem::size_of::<T>()
|
||||
)};
|
||||
|
||||
self.reader.read_exact(buffer)?;
|
||||
|
||||
Ok(result.from_le())
|
||||
}
|
||||
|
||||
fn read_symlink(&mut self, size: u64) -> Result<PathBuf, Error> {
|
||||
if size < (HEADER_SIZE + 2) {
|
||||
bail!("dectected short symlink target.");
|
||||
}
|
||||
let target_len = size - HEADER_SIZE;
|
||||
|
||||
if target_len > (libc::PATH_MAX as u64) {
|
||||
bail!("symlink target too long ({}).", target_len);
|
||||
}
|
||||
|
||||
let mut buffer = vec![0u8; target_len as usize];
|
||||
self.reader.read_exact(&mut buffer)?;
|
||||
|
||||
let last_byte = buffer.pop().unwrap();
|
||||
if last_byte != 0u8 {
|
||||
bail!("symlink target not nul terminated.");
|
||||
}
|
||||
|
||||
Ok(PathBuf::from(std::ffi::OsString::from_vec(buffer)))
|
||||
}
|
||||
|
||||
fn read_filename(&mut self, size: u64) -> Result<OsString, Error> {
|
||||
if size < (HEADER_SIZE + 2) {
|
||||
bail!("dectected short filename");
|
||||
}
|
||||
let name_len = size - HEADER_SIZE;
|
||||
|
||||
if name_len > ((libc::FILENAME_MAX as u64) + 1) {
|
||||
bail!("filename too long ({}).", name_len);
|
||||
}
|
||||
|
||||
let mut buffer = vec![0u8; name_len as usize];
|
||||
self.reader.read_exact(&mut buffer)?;
|
||||
|
||||
let last_byte = buffer.pop().unwrap();
|
||||
if last_byte != 0u8 {
|
||||
bail!("filename entry not nul terminated.");
|
||||
}
|
||||
|
||||
if buffer.iter().find(|b| (**b == b'/')).is_some() {
|
||||
bail!("found invalid filename with slashes.");
|
||||
}
|
||||
|
||||
Ok(std::ffi::OsString::from_vec(buffer))
|
||||
}
|
||||
|
||||
pub fn restore<F: Fn(&Path) -> Result<(), Error>>(
|
||||
&mut self,
|
||||
dir: &CaDirectoryEntry,
|
||||
callback: F,
|
||||
) -> Result<(), Error> {
|
||||
|
||||
let start = dir.start;
|
||||
|
||||
self.reader.seek(SeekFrom::Start(start))?;
|
||||
|
||||
let base = ".";
|
||||
|
||||
let mut path = PathBuf::from(base);
|
||||
|
||||
let dir = match nix::dir::Dir::open(&path, nix::fcntl::OFlag::O_DIRECTORY, nix::sys::stat::Mode::empty()) {
|
||||
Ok(dir) => dir,
|
||||
Err(err) => bail!("unable to open base directory - {}", err),
|
||||
};
|
||||
|
||||
let restore_dir = "restoretest";
|
||||
path.push(restore_dir);
|
||||
|
||||
self.restore_sequential(&mut path, &OsString::from(restore_dir), &dir, &callback)?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn restore_attributes(&mut self, _entry: &CaFormatEntry) -> Result<CaFormatHeader, Error> {
|
||||
|
||||
loop {
|
||||
let head: CaFormatHeader = self.read_item()?;
|
||||
match head.htype {
|
||||
// fimxe: impl ...
|
||||
_ => return Ok(head),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn restore_mode(&mut self, entry: &CaFormatEntry, fd: RawFd) -> Result<(), Error> {
|
||||
|
||||
let mode = Mode::from_bits_truncate((entry.mode as u32) & 0o7777);
|
||||
|
||||
nix::sys::stat::fchmod(fd, mode)?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn restore_mode_at(&mut self, entry: &CaFormatEntry, dirfd: RawFd, filename: &OsStr) -> Result<(), Error> {
|
||||
|
||||
let mode = Mode::from_bits_truncate((entry.mode as u32) & 0o7777);
|
||||
|
||||
// NOTE: we want :FchmodatFlags::NoFollowSymlink, but fchmodat does not support that
|
||||
// on linux (see man fchmodat). Fortunately, we can simply avoid calling this on symlinks.
|
||||
nix::sys::stat::fchmodat(Some(dirfd), filename, mode, nix::sys::stat::FchmodatFlags::FollowSymlink)?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn restore_ugid(&mut self, entry: &CaFormatEntry, fd: RawFd) -> Result<(), Error> {
|
||||
|
||||
let uid = entry.uid as u32;
|
||||
let gid = entry.gid as u32;
|
||||
|
||||
let res = unsafe { libc::fchown(fd, uid, gid) };
|
||||
Errno::result(res)?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn restore_ugid_at(&mut self, entry: &CaFormatEntry, dirfd: RawFd, filename: &OsStr) -> Result<(), Error> {
|
||||
|
||||
let uid = entry.uid as u32;
|
||||
let gid = entry.gid as u32;
|
||||
|
||||
let res = filename.with_nix_path(|cstr| unsafe {
|
||||
libc::fchownat(dirfd, cstr.as_ptr(), uid, gid, libc::AT_SYMLINK_NOFOLLOW)
|
||||
})?;
|
||||
Errno::result(res)?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn restore_mtime(&mut self, entry: &CaFormatEntry, fd: RawFd) -> Result<(), Error> {
|
||||
|
||||
let times = nsec_to_update_timespec(entry.mtime);
|
||||
|
||||
let res = unsafe { libc::futimens(fd, ×[0]) };
|
||||
Errno::result(res)?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn restore_mtime_at(&mut self, entry: &CaFormatEntry, dirfd: RawFd, filename: &OsStr) -> Result<(), Error> {
|
||||
|
||||
let times = nsec_to_update_timespec(entry.mtime);
|
||||
|
||||
let res = filename.with_nix_path(|cstr| unsafe {
|
||||
libc::utimensat(dirfd, cstr.as_ptr(), ×[0], libc::AT_SYMLINK_NOFOLLOW)
|
||||
})?;
|
||||
Errno::result(res)?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn restore_device_at(&mut self, entry: &CaFormatEntry, dirfd: RawFd, filename: &OsStr, device: &CaFormatDevice) -> Result<(), Error> {
|
||||
|
||||
let rdev = nix::sys::stat::makedev(device.major, device.minor);
|
||||
let mode = ((entry.mode as u32) & libc::S_IFMT) | 0o0600;
|
||||
let res = filename.with_nix_path(|cstr| unsafe {
|
||||
libc::mknodat(dirfd, cstr.as_ptr(), mode, rdev)
|
||||
})?;
|
||||
Errno::result(res)?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn restore_socket_at(&mut self, dirfd: RawFd, filename: &OsStr) -> Result<(), Error> {
|
||||
|
||||
let mode = libc::S_IFSOCK | 0o0600;
|
||||
let res = filename.with_nix_path(|cstr| unsafe {
|
||||
libc::mknodat(dirfd, cstr.as_ptr(), mode, 0)
|
||||
})?;
|
||||
Errno::result(res)?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn restore_fifo_at(&mut self, dirfd: RawFd, filename: &OsStr) -> Result<(), Error> {
|
||||
|
||||
let mode = libc::S_IFIFO | 0o0600;
|
||||
let res = filename.with_nix_path(|cstr| unsafe {
|
||||
libc::mkfifoat(dirfd, cstr.as_ptr(), mode)
|
||||
})?;
|
||||
Errno::result(res)?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
pub fn restore_sequential<F: Fn(&Path) -> Result<(), Error>>(
|
||||
&mut self,
|
||||
path: &mut PathBuf, // user for error reporting
|
||||
filename: &OsStr, // repeats path last component
|
||||
parent: &nix::dir::Dir,
|
||||
callback: &F,
|
||||
) -> Result<(), Error> {
|
||||
|
||||
let parent_fd = parent.as_raw_fd();
|
||||
|
||||
// read ENTRY first
|
||||
let head: CaFormatHeader = self.read_item()?;
|
||||
check_ca_header::<CaFormatEntry>(&head, CA_FORMAT_ENTRY)?;
|
||||
let entry: CaFormatEntry = self.read_item()?;
|
||||
|
||||
let mode = entry.mode as u32; //fixme: upper 32bits?
|
||||
|
||||
let ifmt = mode & libc::S_IFMT;
|
||||
|
||||
if ifmt == libc::S_IFDIR {
|
||||
let dir = match dir_mkdirat(parent_fd, filename) {
|
||||
Ok(dir) => dir,
|
||||
Err(err) => bail!("unable to open directory {:?} - {}", path, err),
|
||||
};
|
||||
|
||||
let mut head = self.restore_attributes(&entry)?;
|
||||
|
||||
while head.htype == CA_FORMAT_FILENAME {
|
||||
let name = self.read_filename(head.size)?;
|
||||
path.push(&name);
|
||||
println!("NAME: {:?}", path);
|
||||
self.restore_sequential(path, &name, &dir, callback)?;
|
||||
path.pop();
|
||||
|
||||
head = self.read_item()?;
|
||||
}
|
||||
|
||||
if head.htype != CA_FORMAT_GOODBYE {
|
||||
bail!("got unknown header type inside directory entry {:016x}", head.htype);
|
||||
}
|
||||
|
||||
println!("Skip Goodbye");
|
||||
if head.size < HEADER_SIZE { bail!("detected short goodbye table"); }
|
||||
|
||||
// self.reader.seek(SeekFrom::Current((head.size - HEADER_SIZE) as i64))?;
|
||||
let mut done = 0;
|
||||
let skip = (head.size - HEADER_SIZE) as usize;
|
||||
let mut skip_buffer = vec![0u8; 64*1024];
|
||||
while done < skip {
|
||||
let todo = skip - done;
|
||||
let n = if todo > skip_buffer.len() { skip_buffer.len() } else { todo };
|
||||
let data = &mut skip_buffer[..n];
|
||||
self.reader.read_exact(data)?;
|
||||
done += n;
|
||||
}
|
||||
|
||||
|
||||
self.restore_mode(&entry, dir.as_raw_fd())?;
|
||||
self.restore_mtime(&entry, dir.as_raw_fd())?;
|
||||
self.restore_ugid(&entry, dir.as_raw_fd())?;
|
||||
|
||||
return Ok(());
|
||||
}
|
||||
|
||||
if ifmt == libc::S_IFLNK {
|
||||
// fixme: create symlink
|
||||
//fixme: restore permission, acls, xattr, ...
|
||||
|
||||
let head: CaFormatHeader = self.read_item()?;
|
||||
match head.htype {
|
||||
CA_FORMAT_SYMLINK => {
|
||||
let target = self.read_symlink(head.size)?;
|
||||
println!("TARGET: {:?}", target);
|
||||
if let Err(err) = symlinkat(&target, parent_fd, filename) {
|
||||
bail!("create symlink {:?} failed - {}", path, err);
|
||||
}
|
||||
}
|
||||
_ => {
|
||||
bail!("got unknown header type inside symlink entry {:016x}", head.htype);
|
||||
}
|
||||
}
|
||||
|
||||
// self.restore_mode_at(&entry, parent_fd, filename)?; //not supported on symlinks
|
||||
self.restore_ugid_at(&entry, parent_fd, filename)?;
|
||||
self.restore_mtime_at(&entry, parent_fd, filename)?;
|
||||
|
||||
return Ok(());
|
||||
}
|
||||
|
||||
if ifmt == libc::S_IFSOCK {
|
||||
|
||||
self.restore_socket_at(parent_fd, filename)?;
|
||||
|
||||
self.restore_mode_at(&entry, parent_fd, filename)?;
|
||||
self.restore_ugid_at(&entry, parent_fd, filename)?;
|
||||
self.restore_mtime_at(&entry, parent_fd, filename)?;
|
||||
|
||||
return Ok(());
|
||||
}
|
||||
|
||||
if ifmt == libc::S_IFIFO {
|
||||
|
||||
self.restore_fifo_at(parent_fd, filename)?;
|
||||
|
||||
self.restore_mode_at(&entry, parent_fd, filename)?;
|
||||
self.restore_ugid_at(&entry, parent_fd, filename)?;
|
||||
self.restore_mtime_at(&entry, parent_fd, filename)?;
|
||||
|
||||
return Ok(());
|
||||
}
|
||||
|
||||
if (ifmt == libc::S_IFBLK) || (ifmt == libc::S_IFCHR) {
|
||||
|
||||
let head: CaFormatHeader = self.read_item()?;
|
||||
match head.htype {
|
||||
CA_FORMAT_DEVICE => {
|
||||
let device: CaFormatDevice = self.read_item()?;
|
||||
self.restore_device_at(&entry, parent_fd, filename, &device)?;
|
||||
}
|
||||
_ => {
|
||||
bail!("got unknown header type inside device entry {:016x}", head.htype);
|
||||
}
|
||||
}
|
||||
|
||||
self.restore_mode_at(&entry, parent_fd, filename)?;
|
||||
self.restore_ugid_at(&entry, parent_fd, filename)?;
|
||||
self.restore_mtime_at(&entry, parent_fd, filename)?;
|
||||
|
||||
return Ok(());
|
||||
}
|
||||
|
||||
if ifmt == libc::S_IFREG {
|
||||
|
||||
let mut read_buffer: [u8; 64*1024] = unsafe { std::mem::uninitialized() };
|
||||
|
||||
let flags = OFlag::O_CREAT|OFlag::O_WRONLY|OFlag::O_EXCL;
|
||||
let open_mode = Mode::from_bits_truncate(0o0600 | mode);
|
||||
|
||||
let mut file = match file_openat(parent_fd, filename, flags, open_mode) {
|
||||
Ok(file) => file,
|
||||
Err(err) => bail!("open file {:?} failed - {}", path, err),
|
||||
};
|
||||
|
||||
let head = self.restore_attributes(&entry)?;
|
||||
|
||||
if head.htype != CA_FORMAT_PAYLOAD {
|
||||
bail!("got unknown header type for file entry {:016x}", head.htype);
|
||||
}
|
||||
|
||||
if head.size < HEADER_SIZE {
|
||||
bail!("detected short payload");
|
||||
}
|
||||
let need = (head.size - HEADER_SIZE) as usize;
|
||||
//self.reader.seek(SeekFrom::Current(need as i64))?;
|
||||
|
||||
let mut done = 0;
|
||||
while done < need {
|
||||
let todo = need - done;
|
||||
let n = if todo > read_buffer.len() { read_buffer.len() } else { todo };
|
||||
let data = &mut read_buffer[..n];
|
||||
self.reader.read_exact(data)?;
|
||||
file.write_all(data)?;
|
||||
done += n;
|
||||
}
|
||||
|
||||
self.restore_mode(&entry, file.as_raw_fd())?;
|
||||
self.restore_mtime(&entry, file.as_raw_fd())?;
|
||||
self.restore_ugid(&entry, file.as_raw_fd())?;
|
||||
|
||||
return Ok(());
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn read_directory_entry(&mut self, start: u64, end: u64) -> Result<CaDirectoryEntry, Error> {
|
||||
|
||||
self.reader.seek(SeekFrom::Start(start))?;
|
||||
let mut buffer = [0u8; HEADER_SIZE as usize];
|
||||
self.reader.read_exact(&mut buffer)?;
|
||||
let head = tools::map_struct::<CaFormatHeader>(&buffer)?;
|
||||
|
||||
if u64::from_le(head.htype) != CA_FORMAT_FILENAME {
|
||||
bail!("wrong filename header type for object [{}..{}]", start, end);
|
||||
}
|
||||
|
||||
let name_len = u64::from_le(head.size);
|
||||
|
||||
let entry_start = start + name_len;
|
||||
|
||||
let filename = self.read_filename(name_len)?;
|
||||
|
||||
let head: CaFormatHeader = self.read_item()?;
|
||||
check_ca_header::<CaFormatEntry>(&head, CA_FORMAT_ENTRY)?;
|
||||
let entry: CaFormatEntry = self.read_item()?;
|
||||
|
||||
Ok(CaDirectoryEntry {
|
||||
start: entry_start,
|
||||
end: end,
|
||||
filename: filename,
|
||||
entry: CaFormatEntry {
|
||||
feature_flags: u64::from_le(entry.feature_flags),
|
||||
mode: u64::from_le(entry.mode),
|
||||
flags: u64::from_le(entry.flags),
|
||||
uid: u64::from_le(entry.uid),
|
||||
gid: u64::from_le(entry.gid),
|
||||
mtime: u64::from_le(entry.mtime),
|
||||
},
|
||||
})
|
||||
}
|
||||
|
||||
pub fn list_dir(&mut self, dir: &CaDirectoryEntry) -> Result<Vec<CaDirectoryEntry>, Error> {
|
||||
|
||||
const GOODBYE_ITEM_SIZE: u64 = std::mem::size_of::<CaFormatGoodbyeItem>() as u64;
|
||||
|
||||
let start = dir.start;
|
||||
let end = dir.end;
|
||||
|
||||
//println!("list_dir1: {} {}", start, end);
|
||||
|
||||
if (end - start) < (HEADER_SIZE + GOODBYE_ITEM_SIZE) {
|
||||
bail!("detected short object [{}..{}]", start, end);
|
||||
}
|
||||
|
||||
self.reader.seek(SeekFrom::Start(end - GOODBYE_ITEM_SIZE))?;
|
||||
let mut buffer = [0u8; GOODBYE_ITEM_SIZE as usize];
|
||||
self.reader.read_exact(&mut buffer)?;
|
||||
|
||||
let item = tools::map_struct::<CaFormatGoodbyeItem>(&buffer)?;
|
||||
|
||||
if u64::from_le(item.hash) != CA_FORMAT_GOODBYE_TAIL_MARKER {
|
||||
bail!("missing goodbye tail marker for object [{}..{}]", start, end);
|
||||
}
|
||||
|
||||
let goodbye_table_size = u64::from_le(item.size);
|
||||
if goodbye_table_size < (HEADER_SIZE + GOODBYE_ITEM_SIZE) {
|
||||
bail!("short goodbye table size for object [{}..{}]", start, end);
|
||||
|
||||
}
|
||||
let goodbye_inner_size = goodbye_table_size - HEADER_SIZE - GOODBYE_ITEM_SIZE;
|
||||
if (goodbye_inner_size % GOODBYE_ITEM_SIZE) != 0 {
|
||||
bail!("wrong goodbye inner table size for entry [{}..{}]", start, end);
|
||||
}
|
||||
|
||||
let goodbye_start = end - goodbye_table_size;
|
||||
|
||||
if u64::from_le(item.offset) != (goodbye_start - start) {
|
||||
println!("DEBUG: {} {}", u64::from_le(item.offset), goodbye_start - start);
|
||||
bail!("wrong offset in goodbye tail marker for entry [{}..{}]", start, end);
|
||||
}
|
||||
|
||||
self.reader.seek(SeekFrom::Start(goodbye_start))?;
|
||||
let mut buffer = [0u8; HEADER_SIZE as usize];
|
||||
self.reader.read_exact(&mut buffer)?;
|
||||
let head = tools::map_struct::<CaFormatHeader>(&buffer)?;
|
||||
|
||||
if u64::from_le(head.htype) != CA_FORMAT_GOODBYE {
|
||||
bail!("wrong goodbye table header type for entry [{}..{}]", start, end);
|
||||
}
|
||||
|
||||
if u64::from_le(head.size) != goodbye_table_size {
|
||||
bail!("wrong goodbye table size for entry [{}..{}]", start, end);
|
||||
}
|
||||
|
||||
let mut buffer = [0u8; GOODBYE_ITEM_SIZE as usize];
|
||||
|
||||
let mut range_list = Vec::new();
|
||||
|
||||
for i in 0..goodbye_inner_size/GOODBYE_ITEM_SIZE {
|
||||
self.reader.read_exact(&mut buffer)?;
|
||||
let item = tools::map_struct::<CaFormatGoodbyeItem>(&buffer)?;
|
||||
let item_offset = u64::from_le(item.offset);
|
||||
if item_offset > (goodbye_start - start) {
|
||||
bail!("goodbye entry {} offset out of range [{}..{}] {} {} {}",
|
||||
i, start, end, item_offset, goodbye_start, start);
|
||||
}
|
||||
let item_start = goodbye_start - item_offset;
|
||||
let _item_hash = u64::from_le(item.hash);
|
||||
let item_end = item_start + u64::from_le(item.size);
|
||||
if item_end > goodbye_start {
|
||||
bail!("goodbye entry {} end out of range [{}..{}]",
|
||||
i, start, end);
|
||||
}
|
||||
|
||||
range_list.push((item_start, item_end));
|
||||
}
|
||||
|
||||
let mut result = vec![];
|
||||
|
||||
for (item_start, item_end) in range_list {
|
||||
let entry = self.read_directory_entry(item_start, item_end)?;
|
||||
//println!("ENTRY: {} {} {:?}", item_start, item_end, entry.filename);
|
||||
result.push(entry);
|
||||
}
|
||||
|
||||
Ok(result)
|
||||
}
|
||||
|
||||
pub fn print_filenames<W: std::io::Write>(
|
||||
&mut self,
|
||||
output: &mut W,
|
||||
prefix: &mut PathBuf,
|
||||
dir: &CaDirectoryEntry,
|
||||
) -> Result<(), Error> {
|
||||
|
||||
let mut list = self.list_dir(dir)?;
|
||||
|
||||
list.sort_unstable_by(|a, b| a.filename.cmp(&b.filename));
|
||||
|
||||
for item in &list {
|
||||
|
||||
prefix.push(item.filename.clone());
|
||||
|
||||
let mode = item.entry.mode as u32;
|
||||
|
||||
let ifmt = mode & libc::S_IFMT;
|
||||
|
||||
let osstr: &OsStr = prefix.as_ref();
|
||||
output.write(osstr.as_bytes())?;
|
||||
output.write(b"\n")?;
|
||||
|
||||
if ifmt == libc::S_IFDIR {
|
||||
self.print_filenames(output, prefix, item)?;
|
||||
} else if ifmt == libc::S_IFREG {
|
||||
} else if ifmt == libc::S_IFLNK {
|
||||
} else if ifmt == libc::S_IFBLK {
|
||||
} else if ifmt == libc::S_IFCHR {
|
||||
} else {
|
||||
bail!("unknown item mode/type for {:?}", prefix);
|
||||
}
|
||||
|
||||
prefix.pop();
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
fn file_openat(parent: RawFd, filename: &OsStr, flags: OFlag, mode: Mode) -> Result<std::fs::File, Error> {
|
||||
|
||||
let fd = filename.with_nix_path(|cstr| {
|
||||
nix::fcntl::openat(parent, cstr.as_ref(), flags, mode)
|
||||
})??;
|
||||
|
||||
let file = unsafe { std::fs::File::from_raw_fd(fd) };
|
||||
|
||||
Ok(file)
|
||||
}
|
||||
|
||||
fn dir_mkdirat(parent: RawFd, filename: &OsStr) -> Result<nix::dir::Dir, Error> {
|
||||
|
||||
// call mkdirat first
|
||||
let res = filename.with_nix_path(|cstr| unsafe {
|
||||
libc::mkdirat(parent, cstr.as_ptr(), libc::S_IRWXU)
|
||||
})?;
|
||||
Errno::result(res)?;
|
||||
|
||||
let dir = nix::dir::Dir::openat(parent, filename, OFlag::O_DIRECTORY, Mode::empty())?;
|
||||
|
||||
Ok(dir)
|
||||
}
|
||||
|
||||
fn symlinkat(target: &Path, parent: RawFd, linkname: &OsStr) -> Result<(), Error> {
|
||||
|
||||
target.with_nix_path(|target| {
|
||||
linkname.with_nix_path(|linkname| {
|
||||
let res = unsafe { libc::symlinkat(target.as_ptr(), parent, linkname.as_ptr()) };
|
||||
Errno::result(res)?;
|
||||
Ok(())
|
||||
})?
|
||||
})?
|
||||
}
|
||||
|
||||
fn nsec_to_update_timespec(mtime_nsec: u64) -> [libc::timespec; 2] {
|
||||
|
||||
// restore mtime
|
||||
const UTIME_OMIT: i64 = ((1 << 30) - 2);
|
||||
const NANOS_PER_SEC: i64 = 1_000_000_000;
|
||||
|
||||
let sec = (mtime_nsec as i64) / NANOS_PER_SEC;
|
||||
let nsec = (mtime_nsec as i64) % NANOS_PER_SEC;
|
||||
|
||||
let times: [libc::timespec; 2] = [
|
||||
libc::timespec { tv_sec: 0, tv_nsec: UTIME_OMIT },
|
||||
libc::timespec { tv_sec: sec, tv_nsec: nsec },
|
||||
];
|
||||
|
||||
times
|
||||
}
|
||||
@ -36,7 +36,11 @@ impl <'a, R: Read> SequentialDecoder<'a, R> {
|
||||
Self { reader, skip_buffer }
|
||||
}
|
||||
|
||||
fn read_item<T: Endian>(&mut self) -> Result<T, Error> {
|
||||
pub (crate) fn get_reader_mut(&mut self) -> & mut R {
|
||||
self.reader
|
||||
}
|
||||
|
||||
pub (crate) fn read_item<T: Endian>(&mut self) -> Result<T, Error> {
|
||||
|
||||
let mut result: T = unsafe { std::mem::uninitialized() };
|
||||
|
||||
@ -71,7 +75,7 @@ impl <'a, R: Read> SequentialDecoder<'a, R> {
|
||||
Ok(PathBuf::from(std::ffi::OsString::from_vec(buffer)))
|
||||
}
|
||||
|
||||
fn read_filename(&mut self, size: u64) -> Result<OsString, Error> {
|
||||
pub (crate) fn read_filename(&mut self, size: u64) -> Result<OsString, Error> {
|
||||
if size < (HEADER_SIZE + 2) {
|
||||
bail!("dectected short filename");
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user