551 lines
16 KiB
Rust
551 lines
16 KiB
Rust
//! Tools and utilities
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//!
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//! This is a collection of small and useful tools.
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use std::any::Any;
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use std::collections::HashMap;
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use std::hash::BuildHasher;
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use std::fs::File;
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use std::io::{self, BufRead, Read, Seek, SeekFrom};
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use std::os::unix::io::RawFd;
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use std::path::Path;
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use anyhow::{bail, format_err, Error};
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use serde_json::Value;
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use openssl::hash::{hash, DigestBytes, MessageDigest};
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use percent_encoding::AsciiSet;
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pub use proxmox::tools::fd::Fd;
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pub mod acl;
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pub mod apt;
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pub mod async_io;
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pub mod borrow;
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pub mod cert;
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pub mod daemon;
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pub mod disks;
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pub mod fs;
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pub mod format;
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pub mod lru_cache;
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pub mod runtime;
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pub mod ticket;
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pub mod statistics;
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pub mod systemd;
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pub mod nom;
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pub mod logrotate;
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pub mod loopdev;
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pub mod fuse_loop;
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pub mod socket;
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pub mod subscription;
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pub mod zip;
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pub mod http;
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mod parallel_handler;
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pub use parallel_handler::*;
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mod wrapped_reader_stream;
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pub use wrapped_reader_stream::*;
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mod async_channel_writer;
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pub use async_channel_writer::*;
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mod std_channel_writer;
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pub use std_channel_writer::*;
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pub mod xattr;
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mod process_locker;
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pub use process_locker::*;
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mod file_logger;
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pub use file_logger::*;
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mod broadcast_future;
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pub use broadcast_future::*;
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/// The `BufferedRead` trait provides a single function
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/// `buffered_read`. It returns a reference to an internal buffer. The
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/// purpose of this traid is to avoid unnecessary data copies.
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pub trait BufferedRead {
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/// This functions tries to fill the internal buffers, then
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/// returns a reference to the available data. It returns an empty
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/// buffer if `offset` points to the end of the file.
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fn buffered_read(&mut self, offset: u64) -> Result<&[u8], Error>;
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}
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pub fn json_object_to_query(data: Value) -> Result<String, Error> {
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let mut query = url::form_urlencoded::Serializer::new(String::new());
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let object = data.as_object().ok_or_else(|| {
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format_err!("json_object_to_query: got wrong data type (expected object).")
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})?;
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for (key, value) in object {
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match value {
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Value::Bool(b) => {
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query.append_pair(key, &b.to_string());
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}
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Value::Number(n) => {
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query.append_pair(key, &n.to_string());
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}
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Value::String(s) => {
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query.append_pair(key, &s);
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}
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Value::Array(arr) => {
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for element in arr {
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match element {
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Value::Bool(b) => {
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query.append_pair(key, &b.to_string());
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}
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Value::Number(n) => {
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query.append_pair(key, &n.to_string());
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}
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Value::String(s) => {
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query.append_pair(key, &s);
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}
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_ => bail!(
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"json_object_to_query: unable to handle complex array data types."
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),
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}
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}
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}
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_ => bail!("json_object_to_query: unable to handle complex data types."),
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}
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}
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Ok(query.finish())
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}
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pub fn required_string_param<'a>(param: &'a Value, name: &str) -> Result<&'a str, Error> {
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match param[name].as_str() {
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Some(s) => Ok(s),
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None => bail!("missing parameter '{}'", name),
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}
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}
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pub fn required_string_property<'a>(param: &'a Value, name: &str) -> Result<&'a str, Error> {
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match param[name].as_str() {
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Some(s) => Ok(s),
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None => bail!("missing property '{}'", name),
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}
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}
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pub fn required_integer_param<'a>(param: &'a Value, name: &str) -> Result<i64, Error> {
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match param[name].as_i64() {
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Some(s) => Ok(s),
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None => bail!("missing parameter '{}'", name),
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}
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}
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pub fn required_integer_property<'a>(param: &'a Value, name: &str) -> Result<i64, Error> {
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match param[name].as_i64() {
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Some(s) => Ok(s),
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None => bail!("missing property '{}'", name),
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}
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}
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pub fn required_array_param<'a>(param: &'a Value, name: &str) -> Result<Vec<Value>, Error> {
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match param[name].as_array() {
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Some(s) => Ok(s.to_vec()),
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None => bail!("missing parameter '{}'", name),
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}
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}
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pub fn required_array_property<'a>(param: &'a Value, name: &str) -> Result<Vec<Value>, Error> {
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match param[name].as_array() {
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Some(s) => Ok(s.to_vec()),
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None => bail!("missing property '{}'", name),
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}
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}
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pub fn complete_file_name<S: BuildHasher>(arg: &str, _param: &HashMap<String, String, S>) -> Vec<String> {
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let mut result = vec![];
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use nix::fcntl::AtFlags;
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use nix::fcntl::OFlag;
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use nix::sys::stat::Mode;
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let mut dirname = std::path::PathBuf::from(if arg.is_empty() { "./" } else { arg });
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let is_dir = match nix::sys::stat::fstatat(libc::AT_FDCWD, &dirname, AtFlags::empty()) {
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Ok(stat) => (stat.st_mode & libc::S_IFMT) == libc::S_IFDIR,
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Err(_) => false,
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};
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if !is_dir {
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if let Some(parent) = dirname.parent() {
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dirname = parent.to_owned();
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}
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}
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let mut dir =
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match nix::dir::Dir::openat(libc::AT_FDCWD, &dirname, OFlag::O_DIRECTORY, Mode::empty()) {
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Ok(d) => d,
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Err(_) => return result,
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};
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for item in dir.iter() {
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if let Ok(entry) = item {
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if let Ok(name) = entry.file_name().to_str() {
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if name == "." || name == ".." {
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continue;
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}
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let mut newpath = dirname.clone();
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newpath.push(name);
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if let Ok(stat) =
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nix::sys::stat::fstatat(libc::AT_FDCWD, &newpath, AtFlags::empty())
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{
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if (stat.st_mode & libc::S_IFMT) == libc::S_IFDIR {
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newpath.push("");
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if let Some(newpath) = newpath.to_str() {
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result.push(newpath.to_owned());
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}
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continue;
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}
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}
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if let Some(newpath) = newpath.to_str() {
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result.push(newpath.to_owned());
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}
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}
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}
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}
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result
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}
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/// Scan directory for matching file names.
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///
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/// Scan through all directory entries and call `callback()` function
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/// if the entry name matches the regular expression. This function
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/// used unix `openat()`, so you can pass absolute or relative file
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/// names. This function simply skips non-UTF8 encoded names.
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pub fn scandir<P, F>(
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dirfd: RawFd,
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path: &P,
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regex: ®ex::Regex,
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mut callback: F,
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) -> Result<(), Error>
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where
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F: FnMut(RawFd, &str, nix::dir::Type) -> Result<(), Error>,
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P: ?Sized + nix::NixPath,
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{
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for entry in self::fs::scan_subdir(dirfd, path, regex)? {
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let entry = entry?;
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let file_type = match entry.file_type() {
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Some(file_type) => file_type,
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None => bail!("unable to detect file type"),
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};
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callback(
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entry.parent_fd(),
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unsafe { entry.file_name_utf8_unchecked() },
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file_type,
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)?;
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}
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Ok(())
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}
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/// Shortcut for md5 sums.
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pub fn md5sum(data: &[u8]) -> Result<DigestBytes, Error> {
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hash(MessageDigest::md5(), data).map_err(Error::from)
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}
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pub fn get_hardware_address() -> Result<String, Error> {
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static FILENAME: &str = "/etc/ssh/ssh_host_rsa_key.pub";
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let contents = proxmox::tools::fs::file_get_contents(FILENAME)
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.map_err(|e| format_err!("Error getting host key - {}", e))?;
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let digest = md5sum(&contents)
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.map_err(|e| format_err!("Error digesting host key - {}", e))?;
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Ok(proxmox::tools::bin_to_hex(&digest).to_uppercase())
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}
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pub fn assert_if_modified(digest1: &str, digest2: &str) -> Result<(), Error> {
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if digest1 != digest2 {
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bail!("detected modified configuration - file changed by other user? Try again.");
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}
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Ok(())
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}
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/// Extract a specific cookie from cookie header.
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/// We assume cookie_name is already url encoded.
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pub fn extract_cookie(cookie: &str, cookie_name: &str) -> Option<String> {
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for pair in cookie.split(';') {
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let (name, value) = match pair.find('=') {
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Some(i) => (pair[..i].trim(), pair[(i + 1)..].trim()),
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None => return None, // Cookie format error
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};
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if name == cookie_name {
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use percent_encoding::percent_decode;
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if let Ok(value) = percent_decode(value.as_bytes()).decode_utf8() {
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return Some(value.into());
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} else {
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return None; // Cookie format error
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}
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}
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}
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None
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}
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pub fn join(data: &Vec<String>, sep: char) -> String {
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let mut list = String::new();
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for item in data {
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if !list.is_empty() {
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list.push(sep);
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}
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list.push_str(item);
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}
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list
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}
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/// Detect modified configuration files
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///
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/// This function fails with a reasonable error message if checksums do not match.
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pub fn detect_modified_configuration_file(digest1: &[u8;32], digest2: &[u8;32]) -> Result<(), Error> {
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if digest1 != digest2 {
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bail!("detected modified configuration - file changed by other user? Try again.");
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}
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Ok(())
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}
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/// normalize uri path
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///
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/// Do not allow ".", "..", or hidden files ".XXXX"
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/// Also remove empty path components
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pub fn normalize_uri_path(path: &str) -> Result<(String, Vec<&str>), Error> {
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let items = path.split('/');
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let mut path = String::new();
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let mut components = vec![];
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for name in items {
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if name.is_empty() {
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continue;
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}
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if name.starts_with('.') {
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bail!("Path contains illegal components.");
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}
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path.push('/');
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path.push_str(name);
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components.push(name);
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}
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Ok((path, components))
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}
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/// Helper to check result from std::process::Command output
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///
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/// The exit_code_check() function should return true if the exit code
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/// is considered successful.
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pub fn command_output(
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output: std::process::Output,
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exit_code_check: Option<fn(i32) -> bool>,
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) -> Result<Vec<u8>, Error> {
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if !output.status.success() {
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match output.status.code() {
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Some(code) => {
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let is_ok = match exit_code_check {
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Some(check_fn) => check_fn(code),
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None => code == 0,
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};
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if !is_ok {
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let msg = String::from_utf8(output.stderr)
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.map(|m| if m.is_empty() { String::from("no error message") } else { m })
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.unwrap_or_else(|_| String::from("non utf8 error message (suppressed)"));
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bail!("status code: {} - {}", code, msg);
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}
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}
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None => bail!("terminated by signal"),
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}
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}
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Ok(output.stdout)
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}
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/// Helper to check result from std::process::Command output, returns String.
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///
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/// The exit_code_check() function should return true if the exit code
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/// is considered successful.
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pub fn command_output_as_string(
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output: std::process::Output,
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exit_code_check: Option<fn(i32) -> bool>,
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) -> Result<String, Error> {
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let output = command_output(output, exit_code_check)?;
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let output = String::from_utf8(output)?;
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Ok(output)
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}
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pub fn run_command(
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mut command: std::process::Command,
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exit_code_check: Option<fn(i32) -> bool>,
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) -> Result<String, Error> {
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let output = command.output()
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.map_err(|err| format_err!("failed to execute {:?} - {}", command, err))?;
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let output = command_output_as_string(output, exit_code_check)
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.map_err(|err| format_err!("command {:?} failed - {}", command, err))?;
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Ok(output)
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}
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pub fn fd_change_cloexec(fd: RawFd, on: bool) -> Result<(), Error> {
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use nix::fcntl::{fcntl, FdFlag, F_GETFD, F_SETFD};
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let mut flags = FdFlag::from_bits(fcntl(fd, F_GETFD)?)
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.ok_or_else(|| format_err!("unhandled file flags"))?; // nix crate is stupid this way...
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flags.set(FdFlag::FD_CLOEXEC, on);
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fcntl(fd, F_SETFD(flags))?;
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Ok(())
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}
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static mut SHUTDOWN_REQUESTED: bool = false;
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pub fn request_shutdown() {
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unsafe {
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SHUTDOWN_REQUESTED = true;
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}
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crate::server::server_shutdown();
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}
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#[inline(always)]
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pub fn shutdown_requested() -> bool {
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unsafe { SHUTDOWN_REQUESTED }
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}
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pub fn fail_on_shutdown() -> Result<(), Error> {
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if shutdown_requested() {
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bail!("Server shutdown requested - aborting task");
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}
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Ok(())
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}
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/// safe wrapper for `nix::unistd::pipe2` defaulting to `O_CLOEXEC` and guarding the file
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/// descriptors.
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pub fn pipe() -> Result<(Fd, Fd), Error> {
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let (pin, pout) = nix::unistd::pipe2(nix::fcntl::OFlag::O_CLOEXEC)?;
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Ok((Fd(pin), Fd(pout)))
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}
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/// safe wrapper for `nix::sys::socket::socketpair` defaulting to `O_CLOEXEC` and guarding the file
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/// descriptors.
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pub fn socketpair() -> Result<(Fd, Fd), Error> {
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use nix::sys::socket;
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let (pa, pb) = socket::socketpair(
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socket::AddressFamily::Unix,
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socket::SockType::Stream,
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None,
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socket::SockFlag::SOCK_CLOEXEC,
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)?;
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Ok((Fd(pa), Fd(pb)))
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}
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/// An easy way to convert types to Any
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///
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/// Mostly useful to downcast trait objects (see RpcEnvironment).
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pub trait AsAny {
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fn as_any(&self) -> &dyn Any;
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}
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impl<T: Any> AsAny for T {
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fn as_any(&self) -> &dyn Any {
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self
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}
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}
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/// This used to be: `SIMPLE_ENCODE_SET` plus space, `"`, `#`, `<`, `>`, backtick, `?`, `{`, `}`
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pub const DEFAULT_ENCODE_SET: &AsciiSet = &percent_encoding::CONTROLS // 0..1f and 7e
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// The SIMPLE_ENCODE_SET adds space and anything >= 0x7e (7e itself is already included above)
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.add(0x20)
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.add(0x7f)
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// the DEFAULT_ENCODE_SET added:
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.add(b' ')
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.add(b'"')
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.add(b'#')
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.add(b'<')
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.add(b'>')
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.add(b'`')
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.add(b'?')
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.add(b'{')
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.add(b'}');
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/// Get an iterator over lines of a file, skipping empty lines and comments (lines starting with a
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/// `#`).
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pub fn file_get_non_comment_lines<P: AsRef<Path>>(
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path: P,
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) -> Result<impl Iterator<Item = io::Result<String>>, Error> {
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let path = path.as_ref();
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Ok(io::BufReader::new(
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File::open(path).map_err(|err| format_err!("error opening {:?}: {}", path, err))?,
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)
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.lines()
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.filter_map(|line| match line {
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Ok(line) => {
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let line = line.trim();
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if line.is_empty() || line.starts_with('#') {
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None
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} else {
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Some(Ok(line.to_string()))
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}
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}
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Err(err) => Some(Err(err)),
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}))
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}
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pub fn setup_safe_path_env() {
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std::env::set_var("PATH", "/sbin:/bin:/usr/sbin:/usr/bin");
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// Make %ENV safer - as suggested by https://perldoc.perl.org/perlsec.html
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for name in &["IFS", "CDPATH", "ENV", "BASH_ENV"] {
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std::env::remove_var(name);
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}
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}
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pub fn strip_ascii_whitespace(line: &[u8]) -> &[u8] {
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let line = match line.iter().position(|&b| !b.is_ascii_whitespace()) {
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Some(n) => &line[n..],
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None => return &[],
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};
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match line.iter().rev().position(|&b| !b.is_ascii_whitespace()) {
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Some(n) => &line[..(line.len() - n)],
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None => &[],
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}
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}
|
|
|
|
/// Seeks to start of file and computes the SHA256 hash
|
|
pub fn compute_file_csum(file: &mut File) -> Result<([u8; 32], u64), Error> {
|
|
|
|
file.seek(SeekFrom::Start(0))?;
|
|
|
|
let mut hasher = openssl::sha::Sha256::new();
|
|
let mut buffer = proxmox::tools::vec::undefined(256*1024);
|
|
let mut size: u64 = 0;
|
|
|
|
loop {
|
|
let count = match file.read(&mut buffer) {
|
|
Ok(count) => count,
|
|
Err(ref err) if err.kind() == std::io::ErrorKind::Interrupted => {
|
|
continue;
|
|
}
|
|
Err(err) => return Err(err.into()),
|
|
};
|
|
if count == 0 {
|
|
break;
|
|
}
|
|
size += count as u64;
|
|
hasher.update(&buffer[..count]);
|
|
}
|
|
|
|
let csum = hasher.finish();
|
|
|
|
Ok((csum, size))
|
|
}
|