proxmox-backup/src/backup/catalog_blob.rs

226 lines
7.3 KiB
Rust
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use failure::*;
use std::sync::Arc;
use std::ffi::{CStr, CString};
use std::io::{Read, BufRead, BufReader, Write, Seek};
use std::convert::TryFrom;
use chrono::offset::{TimeZone, Local};
use proxmox::tools::io::ReadExt;
use crate::pxar::catalog::{BackupCatalogWriter, CatalogEntryType};
use super::{DataBlobWriter, DataBlobReader, CryptConfig};
pub struct CatalogBlobWriter<W: Write + Seek> {
writer: DataBlobWriter<W>,
level: usize,
}
impl <W: Write + Seek> CatalogBlobWriter<W> {
pub fn new_compressed(writer: W) -> Result<Self, Error> {
let writer = DataBlobWriter::new_compressed(writer)?;
Ok(Self { writer, level: 0 })
}
pub fn new_signed_compressed(writer: W, config: Arc<CryptConfig>) -> Result<Self, Error> {
let writer = DataBlobWriter::new_signed_compressed(writer, config)?;
Ok(Self { writer, level: 0 })
}
pub fn new_encrypted_compressed(writer: W, config: Arc<CryptConfig>) -> Result<Self, Error> {
let writer = DataBlobWriter::new_encrypted_compressed(writer, config)?;
Ok(Self { writer, level: 0 })
}
pub fn finish(self) -> Result<W, Error> {
self.writer.finish()
}
}
impl <W: Write + Seek> BackupCatalogWriter for CatalogBlobWriter<W> {
fn start_directory(&mut self, name: &CStr) -> Result<(), Error> {
self.writer.write_all(&[CatalogEntryType::Directory as u8])?;
self.writer.write_all(name.to_bytes_with_nul())?;
self.writer.write_all(b"{")?;
self.level += 1;
Ok(())
}
fn end_directory(&mut self) -> Result<(), Error> {
if self.level == 0 {
bail!("got unexpected end_directory level 0");
}
self.writer.write_all(b"}")?;
self.level -= 1;
Ok(())
}
fn add_file(&mut self, name: &CStr, size: u64, mtime: u64) -> Result<(), Error> {
self.writer.write_all(&[CatalogEntryType::File as u8])?;
self.writer.write_all(&size.to_le_bytes())?;
self.writer.write_all(&mtime.to_le_bytes())?;
self.writer.write_all(name.to_bytes_with_nul())?;
Ok(())
}
fn add_symlink(&mut self, name: &CStr) -> Result<(), Error> {
self.writer.write_all(&[CatalogEntryType::Symlink as u8])?;
self.writer.write_all(name.to_bytes_with_nul())?;
Ok(())
}
fn add_hardlink(&mut self, name: &CStr) -> Result<(), Error> {
self.writer.write_all(&[CatalogEntryType::Hardlink as u8])?;
self.writer.write_all(name.to_bytes_with_nul())?;
Ok(())
}
fn add_block_device(&mut self, name: &CStr) -> Result<(), Error> {
self.writer.write_all(&[CatalogEntryType::BlockDevice as u8])?;
self.writer.write_all(name.to_bytes_with_nul())?;
Ok(())
}
fn add_char_device(&mut self, name: &CStr) -> Result<(), Error> {
self.writer.write_all(&[CatalogEntryType::CharDevice as u8])?;
self.writer.write_all(name.to_bytes_with_nul())?;
Ok(())
}
fn add_fifo(&mut self, name: &CStr) -> Result<(), Error> {
self.writer.write_all(&[CatalogEntryType::Fifo as u8])?;
self.writer.write_all(name.to_bytes_with_nul())?;
Ok(())
}
fn add_socket(&mut self, name: &CStr) -> Result<(), Error> {
self.writer.write_all(&[CatalogEntryType::Socket as u8])?;
self.writer.write_all(name.to_bytes_with_nul())?;
Ok(())
}
}
pub struct CatalogBlobReader<R: Read + BufRead> {
reader: BufReader<DataBlobReader<R>>,
dir_stack: Vec<CString>,
}
impl <R: Read + BufRead> CatalogBlobReader<R> {
pub fn new(reader: R, crypt_config: Option<Arc<CryptConfig>>) -> Result<Self, Error> {
let dir_stack = Vec::new();
let reader = BufReader::new(DataBlobReader::new(reader, crypt_config)?);
Ok(Self { reader, dir_stack })
}
fn read_filename(&mut self) -> Result<std::ffi::CString, Error> {
let mut filename = Vec::new();
self.reader.read_until(0u8, &mut filename)?;
if filename.len() > 0 && filename[filename.len()-1] == 0u8 {
filename.pop();
}
if filename.len() == 0 {
bail!("got zero length filename");
}
if filename.iter().find(|b| **b == b'/').is_some() {
bail!("found invalid filename with slashes.");
}
Ok(unsafe { CString::from_vec_unchecked(filename) })
}
fn next_byte(&mut self) -> Result<u8, std::io::Error> {
let mut buf = [0u8; 1];
self.reader.read_exact(&mut buf)?;
Ok(buf[0])
}
fn expect_next(&mut self, expect: u8) -> Result<(), Error> {
let next = self.next_byte()?;
if next != expect {
bail!("got unexpected byte ({} != {})", next, expect);
}
Ok(())
}
fn print_entry(&self, etype: CatalogEntryType, filename: &CStr, size: u64, mtime: u64) -> Result<(), Error> {
let mut out = Vec::new();
write!(out, "{} ", char::from(etype as u8))?;
for name in &self.dir_stack {
out.extend(name.to_bytes());
out.push(b'/');
}
out.extend(filename.to_bytes());
let dt = Local.timestamp(mtime as i64, 0);
if etype == CatalogEntryType::File {
write!(out, " {} {}", size, dt.to_rfc3339_opts(chrono::SecondsFormat::Secs, false))?;
}
writeln!(out)?;
std::io::stdout().write_all(&out)?;
Ok(())
}
fn parse_entries(&mut self) -> Result<(), Error> {
loop {
let etype = match self.next_byte() {
Ok(v) => v,
Err(err) => {
if err.kind() == std::io::ErrorKind::UnexpectedEof {
if self.dir_stack.len() == 0 {
break;
}
}
return Err(err.into());
}
};
if etype == b'}' {
if self.dir_stack.pop().is_none() {
bail!("got unexpected '}'");
}
break;
}
let etype = CatalogEntryType::try_from(etype)?;
match etype {
CatalogEntryType::Directory => {
let filename = self.read_filename()?;
self.print_entry(etype.into(), &filename, 0, 0)?;
self.dir_stack.push(filename);
self.expect_next(b'{')?;
self.parse_entries()?;
}
CatalogEntryType::File => {
let size = unsafe { self.reader.read_le_value::<u64>()? };
let mtime = unsafe { self.reader.read_le_value::<u64>()? };
let filename = self.read_filename()?;
self.print_entry(etype.into(), &filename, size, mtime)?;
}
CatalogEntryType::Symlink |
CatalogEntryType::Hardlink |
CatalogEntryType::Fifo |
CatalogEntryType::Socket |
CatalogEntryType::BlockDevice |
CatalogEntryType::CharDevice => {
let filename = self.read_filename()?;
self.print_entry(etype.into(), &filename, 0, 0)?;
}
}
}
Ok(())
}
pub fn dump(&mut self) -> Result<(), Error> {
self.parse_entries()?;
Ok(())
}
}