sd-notify-0.4.1/.cargo_vcs_info.json0000644000000001360000000000100127520ustar { "git": { "sha1": "1898486ebf49e183e652fa5f29e1053595369760" }, "path_in_vcs": "" }sd-notify-0.4.1/.github/workflows/ci.yml000064400000000000000000000013461046102023000162610ustar 00000000000000name: ci on: pull_request: push: branches: - master env: CARGO_INCREMENTAL: 0 jobs: build: name: Build runs-on: ubuntu-latest steps: - name: Checkout uses: actions/checkout@v1 - name: Install toolchain uses: actions-rs/toolchain@v1 with: toolchain: stable profile: minimal override: true components: rustfmt, clippy - name: Fetch run: cargo fetch - name: Format run: cargo fmt -- --check - name: Build run: cargo build - name: Clippy run: cargo clippy -- -D warnings - name: Build tests run: cargo test --no-run - name: Test run: cargo test sd-notify-0.4.1/.gitignore000064400000000000000000000000361046102023000135310ustar 00000000000000/target **/*.rs.bk Cargo.lock sd-notify-0.4.1/CHANGELOG.md000064400000000000000000000021031046102023000133470ustar 00000000000000# Changelog ## [0.4.1] - 2022-08-31 ### Changed - added `watchdog_enabled` (similar to [`sd_watchdog_enabled`](https://www.freedesktop.org/software/systemd/man/sd_watchdog_enabled.html)) ## [0.4.0] - 2022-01-12 ### Changed - (breaking) `NotifyState::Status`, `NotifyState::BusError` and `NotifyState::Custom` now contain a `&str` instead of a `String` - the crate is now using the 2021 edition ## [0.3.0] - 2021-02-25 ### Changed - (breaking) `listen_fds` now returns an iterator over `RawFd` values - (breaking) `SD_LISTEN_FDS_START` is gone ## [0.2.0] - 2021-02-18 ### Changed - (breaking) changed the `NotifyState::MainPid` and `NotifyState::Error` data from `i32` to `u32` - (breaking) changed `listen_fds` to return `Result` instead of `Result` ### Fixed - fixed `Display` implementation for `NotifyState::WatchdogUsec` and `NotifyState::ExtendTimeoutUsec` - removed a stray debug print ## [0.1.1] - 2019-10-20 ### Added - `listen_fds` function for file descriptor retrieval when using socket activation ## [0.1.0] - 2019-09-22 ### Added - Initial release sd-notify-0.4.1/Cargo.toml0000644000000015120000000000100107470ustar # THIS FILE IS AUTOMATICALLY GENERATED BY CARGO # # When uploading crates to the registry Cargo will automatically # "normalize" Cargo.toml files for maximal compatibility # with all versions of Cargo and also rewrite `path` dependencies # to registry (e.g., crates.io) dependencies. # # If you are reading this file be aware that the original Cargo.toml # will likely look very different (and much more reasonable). # See Cargo.toml.orig for the original contents. [package] edition = "2021" name = "sd-notify" version = "0.4.1" description = "Lightweight crate for systemd service state notifications" readme = "README.md" keywords = [ "systemd", "sd_notify", ] categories = ["os"] license = "MIT OR Apache-2.0" repository = "https://github.com/lnicola/sd-notify" [package.metadata.docs.rs] targets = ["x86_64-unknown-linux-gnu"] sd-notify-0.4.1/Cargo.toml.orig000064400000000000000000000005541046102023000144350ustar 00000000000000[package] name = "sd-notify" version = "0.4.1" edition = "2021" description = "Lightweight crate for systemd service state notifications" readme = "README.md" keywords = ["systemd", "sd_notify"] categories = ["os"] license = "MIT OR Apache-2.0" repository = "https://github.com/lnicola/sd-notify" [package.metadata.docs.rs] targets = ["x86_64-unknown-linux-gnu"] sd-notify-0.4.1/LICENSE-APACHE000064400000000000000000000251371046102023000134760ustar 00000000000000 Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. 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See the License for the specific language governing permissions and limitations under the License. sd-notify-0.4.1/LICENSE-MIT000064400000000000000000000020451046102023000131770ustar 00000000000000Copyright (c) 2019 Laurențiu Nicola Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. sd-notify-0.4.1/README.md000064400000000000000000000021271046102023000130230ustar 00000000000000# `sd-notify` [![Actions Status]][github actions] [![Latest Version]][crates.io] [![API docs]][docs.rs] [Actions Status]: https://github.com/lnicola/sd-notify/workflows/ci/badge.svg [github actions]: https://github.com/lnicola/sd-notify/actions [Latest Version]: https://img.shields.io/crates/v/sd-notify.svg [crates.io]: https://crates.io/crates/sd-notify [API docs]: https://docs.rs/sd-notify/badge.svg [docs.rs]: https://docs.rs/sd-notify/ A lightweight (no dependencies) crate for sending `systemd` service state notifications. ## Quick start ```rust let _ = sd_notify::notify(true, &[NotifyState::Ready]); ``` ## Releases Release notes are available in [CHANGELOG.md](CHANGELOG.md). ## License This project is licensed under either of * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or [http://www.apache.org/licenses/LICENSE-2.0][LICENSE-APACHE]) * MIT license ([LICENSE-MIT](LICENSE-MIT) or [http://opensource.org/licenses/MIT][LICENSE-MIT]) at your option. [LICENSE-APACHE]: http://www.apache.org/licenses/LICENSE-2.0 [LICENSE-MIT]: http://opensource.org/licenses/MIT sd-notify-0.4.1/src/ffi.rs000064400000000000000000000002641046102023000134450ustar 00000000000000extern "C" { pub fn fcntl(fd: i32, cmd: i32, ...) -> i32; } pub const F_GETFD: i32 = 1; pub const F_SETFD: i32 = 2; pub const FD_CLOEXEC: i32 = 2; pub const EBADF: i32 = 9; sd-notify-0.4.1/src/lib.rs000064400000000000000000000305471046102023000134560ustar 00000000000000#![doc(html_root_url = "https://docs.rs/sd-notify/0.1.0")] #![deny(missing_docs)] //! Lightweight crate for interacting with `systemd`. //! //! This crate can be used to send service readiness or state change notifications //! to `systemd` or compatible service managers. It doesn't offer the full //! functionality of `libsystemd`, but is pure-Rust and has no dependencies. //! //! For bindings to the native `libsystemd` library, see the [`systemd`][systemd] //! crate. For a more complete Rust reimplementation of `libsystemd` API, see the //! [`libsystemd`][libsystemd] crate. //! //! [systemd]: https://crates.io/crates/systemd //! [libsystemd]: https://crates.io/crates/libsystemd //! //! # Example //! //! ```no_run //! # use sd_notify::NotifyState; //! # //! let _ = sd_notify::notify(true, &[NotifyState::Ready]); //! ``` use std::convert::TryFrom; use std::env; use std::fmt::{self, Display, Formatter, Write}; use std::fs; use std::io::{self, ErrorKind}; use std::os::unix::io::RawFd; use std::os::unix::net::UnixDatagram; use std::process; use std::str::FromStr; mod ffi; /// Daemon notification for the service manager. #[derive(Clone, Debug)] pub enum NotifyState<'a> { /// Service startup is finished. Ready, /// Service is reloading its configuration. Reloading, /// Service is stopping. Stopping, /// Free-form status message for the service manager. Status(&'a str), /// Service has failed with an `errno`-style error code, e.g. `2` for `ENOENT`. Errno(u32), /// Service has failed with a D-Bus-style error code, e.g. `org.freedesktop.DBus.Error.TimedOut`. BusError(&'a str), /// Main process ID (PID) of the service, in case it wasn't started directly by the service manager. MainPid(u32), /// Tells the service manager to update the watchdog timestamp. Watchdog, /// Tells the service manager to trigger a watchdog failure. WatchdogTrigger, /// Resets the configured watchdog value. WatchdogUsec(u32), /// Tells the service manager to extend the service timeout. ExtendTimeoutUsec(u32), /// Custom state. Custom(&'a str), } impl Display for NotifyState<'_> { fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result { match self { NotifyState::Ready => write!(f, "READY=1"), NotifyState::Reloading => write!(f, "RELOADING=1"), NotifyState::Stopping => write!(f, "STOPPING=1"), NotifyState::Status(msg) => write!(f, "STATUS={}", msg), NotifyState::Errno(err) => write!(f, "ERRNO={}", err), NotifyState::BusError(addr) => write!(f, "BUSERROR={}", addr), NotifyState::MainPid(pid) => write!(f, "MAINPID={}", pid), NotifyState::Watchdog => write!(f, "WATCHDOG=1"), NotifyState::WatchdogTrigger => write!(f, "WATCHDOG=trigger"), NotifyState::WatchdogUsec(usec) => write!(f, "WATCHDOG_USEC={}", usec), NotifyState::ExtendTimeoutUsec(usec) => write!(f, "EXTEND_TIMEOUT_USEC={}", usec), NotifyState::Custom(state) => write!(f, "{}", state), } } } /// Checks whether the system has been booted by `systemd`. /// /// This is implemented by verifying that a `/run/systemd/system` directory exists. /// /// # Example /// /// ```no_run /// let _ = sd_notify::booted(); /// ``` pub fn booted() -> io::Result { let m = fs::symlink_metadata("/run/systemd/system")?; Ok(m.is_dir()) } /// Sends the service manager a list of state changes. /// /// If the `unset_env` parameter is set, the `NOTIFY_SOCKET` environment variable /// will be unset before returning. Further calls to `sd_notify` will fail, but /// child processes will no longer inherit the variable. /// /// The notification mechanism involves sending a datagram to a Unix domain socket. /// See [`sd_notify(3)`][sd_notify] for details. /// /// [sd_notify]: https://www.freedesktop.org/software/systemd/man/sd_notify.html /// /// # Limitations /// /// The implementation of this function is somewhat naive: it doesn't support /// sending notifications on behalf of other processes, doesn't pass file /// descriptors, doesn't send credentials, and does not increase the send /// buffer size. It's still useful, though, in usual situations. /// /// # Example /// /// ```no_run /// # use sd_notify::NotifyState; /// # /// let _ = sd_notify::notify(true, &[NotifyState::Ready]); /// ``` pub fn notify(unset_env: bool, state: &[NotifyState]) -> io::Result<()> { let socket_path = match env::var_os("NOTIFY_SOCKET") { Some(path) => path, None => return Ok(()), }; if unset_env { env::remove_var("NOTIFY_SOCKET"); } let mut msg = String::new(); let sock = UnixDatagram::unbound()?; for s in state { let _ = writeln!(msg, "{}", s); } let len = sock.send_to(msg.as_bytes(), socket_path)?; if len != msg.len() { Err(io::Error::new(ErrorKind::WriteZero, "incomplete write")) } else { Ok(()) } } /// Checks for file descriptors passed by the service manager for socket /// activation. /// /// The function returns an iterator over file descriptors, starting from /// `SD_LISTEN_FDS_START`. The number of descriptors is obtained from the /// `LISTEN_FDS` environment variable. /// /// Before returning, the file descriptors are set as `O_CLOEXEC`. /// /// See [`sd_listen_fds(3)`][sd_listen_fds] for details. /// /// [sd_listen_fds]: https://www.freedesktop.org/software/systemd/man/sd_listen_fds.html /// /// # Example /// /// ```no_run /// let socket = sd_notify::listen_fds().map(|mut fds| fds.next().expect("missing fd")); /// ``` pub fn listen_fds() -> io::Result> { struct Guard; impl Drop for Guard { fn drop(&mut self) { env::remove_var("LISTEN_PID"); env::remove_var("LISTEN_FDS"); } } let _guard = Guard; let listen_pid = if let Ok(pid) = env::var("LISTEN_PID") { pid } else { return Ok(0..0); } .parse::() .map_err(|_| io::Error::new(ErrorKind::InvalidInput, "invalid LISTEN_PID"))?; if listen_pid != process::id() { return Ok(0..0); } let listen_fds = if let Ok(fds) = env::var("LISTEN_FDS") { fds } else { return Ok(0..0); } .parse::() .map_err(|_| io::Error::new(ErrorKind::InvalidInput, "invalid LISTEN_FDS"))?; let overflow = || io::Error::new(ErrorKind::InvalidInput, "fd count overflowed"); const SD_LISTEN_FDS_START: u32 = 3; let last = SD_LISTEN_FDS_START .checked_add(listen_fds) .ok_or_else(overflow)?; for fd in SD_LISTEN_FDS_START..last { fd_cloexec(fd)? } let last = RawFd::try_from(last).map_err(|_| overflow())?; let listen_fds = SD_LISTEN_FDS_START as RawFd..last; Ok(listen_fds) } fn fd_cloexec(fd: u32) -> io::Result<()> { let fd = RawFd::try_from(fd).map_err(|_| io::Error::from_raw_os_error(ffi::EBADF))?; let flags = unsafe { ffi::fcntl(fd, ffi::F_GETFD, 0) }; if flags < 0 { return Err(io::Error::last_os_error()); } let new_flags = flags | ffi::FD_CLOEXEC; if new_flags != flags { let r = unsafe { ffi::fcntl(fd, ffi::F_SETFD, new_flags) }; if r < 0 { return Err(io::Error::last_os_error()); } } Ok(()) } /// Asks the service manager for enabled watchdog. /// /// If the `unset_env` parameter is set, the `WATCHDOG_USEC` and `WATCHDOG_PID` environment variables /// will be unset before returning. Further calls to `watchdog_enabled` will fail, but /// child processes will no longer inherit the variable. /// /// See [`sd_watchdog_enabled(3)`][sd_watchdog_enabled] for details. /// /// [sd_watchdog_enabled]: https://www.freedesktop.org/software/systemd/man/sd_watchdog_enabled.html /// /// /// # Example /// /// ```no_run /// # use sd_notify; /// # /// let mut usec = 0; /// let enabled = sd_notify::watchdog_enabled(true, &mut usec); /// ``` pub fn watchdog_enabled(unset_env: bool, usec: &mut u64) -> bool { struct Guard { unset_env: bool, } impl Drop for Guard { fn drop(&mut self) { if self.unset_env { env::remove_var("WATCHDOG_USEC"); env::remove_var("WATCHDOG_PID"); } } } let _guard = Guard { unset_env }; let s = env::var("WATCHDOG_USEC") .ok() .and_then(|s| u64::from_str(&s).ok()); let p = env::var("WATCHDOG_PID") .ok() .and_then(|s| u32::from_str(&s).ok()); match (s, p) { (Some(usec_val), Some(pid)) if pid == process::id() => { *usec = usec_val; true } _ => false, } } #[cfg(test)] mod tests { use super::NotifyState; use std::env; use std::fs; use std::os::unix::net::UnixDatagram; use std::path::PathBuf; use std::process; struct SocketHelper(PathBuf, UnixDatagram); impl SocketHelper { pub fn recv_string(&self) -> String { let mut buf = [0; 1024]; let len = self.1.recv(&mut buf).unwrap(); String::from_utf8(Vec::from(&buf[0..len])).unwrap() } } impl Drop for SocketHelper { fn drop(&mut self) { let _ = fs::remove_file(&self.0); } } fn bind_socket() -> SocketHelper { let path = env::temp_dir().join("sd-notify-test-sock"); let _ = fs::remove_file(&path); env::set_var("NOTIFY_SOCKET", &path); let sock = UnixDatagram::bind(&path).unwrap(); SocketHelper(path, sock) } #[test] fn notify() { let s = bind_socket(); super::notify(false, &[NotifyState::Ready]).unwrap(); assert_eq!(s.recv_string(), "READY=1\n"); assert!(env::var_os("NOTIFY_SOCKET").is_some()); super::notify( true, &[ NotifyState::Status("Reticulating splines"), NotifyState::Watchdog, NotifyState::Custom("X_WORKS=1"), ], ) .unwrap(); assert_eq!( s.recv_string(), "STATUS=Reticulating splines\nWATCHDOG=1\nX_WORKS=1\n" ); assert!(env::var_os("NOTIFY_SOCKET").is_none()); } #[test] fn listen_fds() { // We are not testing the success case because `fd_cloexec` would fail. assert!(super::listen_fds().unwrap().next().is_none()); env::set_var("LISTEN_PID", "1"); env::set_var("LISTEN_FDS", "1"); assert!(super::listen_fds().unwrap().next().is_none()); assert!(env::var_os("LISTEN_PID").is_none()); assert!(env::var_os("LISTEN_FDS").is_none()); env::set_var("LISTEN_PID", "no way"); env::set_var("LISTEN_FDS", "1"); assert!(super::listen_fds().is_err()); assert!(env::var_os("LISTEN_PID").is_none()); assert!(env::var_os("LISTEN_FDS").is_none()); } #[test] fn watchdog_enabled() { // test original logic: https://github.com/systemd/systemd/blob/f3376ee8fa28aab3f7edfad1ddfbcceca5bc841c/src/libsystemd/sd-daemon/sd-daemon.c#L632 // invalid pid and unset env env::set_var("WATCHDOG_USEC", "5"); env::set_var("WATCHDOG_PID", "1"); let mut usec = 0; assert_eq!(super::watchdog_enabled(true, &mut usec), false); assert_eq!(usec, 0 as u64); assert!(env::var_os("WATCHDOG_USEC").is_none()); assert!(env::var_os("WATCHDOG_PID").is_none()); // invalid usec and no unset env env::set_var("WATCHDOG_USEC", "invalid-usec"); env::set_var("WATCHDOG_PID", process::id().to_string()); let mut usec = 0; assert_eq!(super::watchdog_enabled(true, &mut usec), false); assert_eq!(usec, 0); assert!(env::var_os("WATCHDOG_USEC").is_none()); assert!(env::var_os("WATCHDOG_PID").is_none()); // no usec, no pip no unset env let mut usec = 0; assert_eq!(super::watchdog_enabled(false, &mut usec), false); assert_eq!(usec, 0); assert!(env::var_os("WATCHDOG_USEC").is_none()); assert!(env::var_os("WATCHDOG_PID").is_none()); // valid pip env::set_var("WATCHDOG_USEC", "5"); env::set_var("WATCHDOG_PID", process::id().to_string()); let mut usec = 0; assert_eq!(super::watchdog_enabled(false, &mut usec), true); assert_eq!(usec, 5 as u64); assert!(env::var_os("WATCHDOG_USEC").is_some()); assert!(env::var_os("WATCHDOG_PID").is_some()); } }