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Travis Burtrum 2021-03-14 01:34:34 -05:00
parent 68551393b0
commit f24029ca35
12 changed files with 986 additions and 364 deletions
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42
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properties(
[
disableConcurrentBuilds()
]
)
node('linux && docker') {
try {
stage('Checkout') {
//branch name from Jenkins environment variables
echo "My branch is: ${env.BRANCH_NAME}"
// this doesn't grab tags pointing to this branch
//checkout scm
// this hack does... https://issues.jenkins.io/browse/JENKINS-45164
checkout([
$class: 'GitSCM',
branches: [[name: 'refs/heads/'+env.BRANCH_NAME]],
extensions: [[$class: 'CloneOption', noTags: false, shallow: false, depth: 0, reference: '']],
userRemoteConfigs: scm.userRemoteConfigs,
])
sh '''
set -euxo pipefail
git checkout "$BRANCH_NAME" --
git reset --hard "origin/$BRANCH_NAME"
'''
}
stage('Build + Deploy') {
sh 'curl --compressed -sL https://code.moparisthebest.com/moparisthebest/self-ci/raw/branch/master/build-ci.sh | bash'
}
currentBuild.result = 'SUCCESS'
} catch (Exception err) {
currentBuild.result = 'FAILURE'
} finally {
stage('Email') {
step([$class: 'Mailer', notifyEveryUnstableBuild: true, recipients: 'admin.jenkins@moparisthebest.com', sendToIndividuals: true])
}
deleteDir()
}
}

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.ci/build.sh Executable file
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#!/bin/bash
set -exo pipefail
echo "starting build for TARGET $TARGET"
export CRATE_NAME=kiss-ntpd
# cross doesn't actually support stdin/stdout pipes for some reason, skip it for now
DISABLE_TESTS=1
SUFFIX=""
echo "$TARGET" | grep -E '^x86_64-pc-windows-gnu$' >/dev/null && SUFFIX=".exe"
cross rustc --bin kiss-ntpd --target $TARGET --release
# to check how they are built
file "target/$TARGET/release/kiss-ntpd$SUFFIX"
# if this commit has a tag, upload artifact to release
strip "target/$TARGET/release/kiss-ntpd$SUFFIX" || true # if strip fails, it's fine
mkdir -p release
mv "target/$TARGET/release/kiss-ntpd$SUFFIX" "release/kiss-ntpd-$TARGET$SUFFIX"
echo 'build success!'
exit 0

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target/
**/*.rs.bk
.idea/

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.rustfmt.toml Normal file
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max_width = 200

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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
[[package]]
name = "kiss-ntpd"
version = "1.0.0"

27
Cargo.toml
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[package]
name = "rsntp"
version = "0.0.1"
authors = ["Miroslav Lichvar <mlichvar0@gmail.com>"]
description = "Multi-threaded NTP server"
license = "GPLv2+"
name = "kiss-ntpd"
version = "1.0.0"
authors = ["moparisthebest <admin@moparisthebest.com>"]
edition = "2018"
[dependencies]
byteorder = "1.2.0"
getopts = "0.2.14"
net2 = "0.2.29"
privdrop = "= 0.2.0"
rand = "0.6"
description = "NTP server that Keeps It Simple, Stupid"
repository = "https://code.moparisthebest.com/moparisthebest/kiss-ntpd"
keywords = ["ntp", "time", "kiss"]
license = "AGPL-3.0-or-later"
readme = "README.md"
include = [
"**/*.rs",
"Cargo.toml",
"*.md",
]

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LICENSE.md Normal file
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### GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007
Copyright (C) 2007 Free Software Foundation, Inc.
<https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.
### Preamble
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The licenses for most software and other practical works are designed
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Developers that use our General Public Licenses protect your rights
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#### 7. Additional Terms.
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#### 8. Termination.
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#### 9. Acceptance Not Required for Having Copies.
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#### 10. Automatic Licensing of Downstream Recipients.
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#### 11. Patents.
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you grant is automatically extended to all recipients of the covered
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A patent license is "discriminatory" if it does not include within the
scope of its coverage, prohibits the exercise of, or is conditioned on
the non-exercise of one or more of the rights that are specifically
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Nothing in this License shall be construed as excluding or limiting
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#### 12. No Surrender of Others' Freedom.
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from those to whom you convey the Program, the only way you could
satisfy both those terms and this License would be to refrain entirely
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#### 13. Remote Network Interaction; Use with the GNU General Public License.
Notwithstanding any other provision of this License, if you modify the
Program, your modified version must prominently offer all users
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#### 14. Revised Versions of this License.
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GNU Affero General Public License, you may choose any version ever
published by the Free Software Foundation.
If the Program specifies that a proxy can decide which future versions
of the GNU Affero General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
#### 15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
CORRECTION.
#### 16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR
CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT
NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR
LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM
TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER
PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
#### 17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
### How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these
terms.
To do so, attach the following notices to the program. It is safest to
attach them to the start of each source file to most effectively state
the exclusion of warranty; and each file should have at least the
"copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper
mail.
If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source. For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code. There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for
the specific requirements.
You should also get your employer (if you work as a programmer) or
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. For more information on this, and how to apply and follow
the GNU AGPL, see <https://www.gnu.org/licenses/>.

8
Makefile
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@ -1,8 +0,0 @@
debug:
cargo build
release:
cargo build --release
clean:
cargo clean

33
README.adoc
View File

@ -1,33 +0,0 @@
= rsntp
+rsntp+ is an experimental high-performance NTP server written in Rust. It does
not implement a full NTP client and relies on another NTP client and server to
be running on the system instead. It periodically updates its state to mirror
the real NTP client/server and uses multiple threads to serve the current
system time.
By default, +rsntp+ uses one thread for IPv4 and another for IPv6. In order to
get the best performance, it's necessary to increase the number of threads
using the +--ipv4-threads+ and +--ipv6-threads+ options to correspond to the
number of CPU cores available on the system.
The real NTP client/server needs to be configured to listen on 127.0.0.1 on
port 11123 (or another port if specified with the +--server-addr+ option). For
instance, the following configuration should work with +chronyd+:
----
allow 127.0.0.1
port 11123
bindaddress 127.0.0.1
----
The following table shows the maximum number of NTP requests handled per second
measured on a Linux (4.16) machine with an Intel E5-1220 CPU (4 cores) and an
Intel I350 network card (1 Gb/s).
|==========================================================
| 1 thread | 430 kpps
| 2 threads | 750 kpps
| 3 threads | 1030 kpps
| 4 threads | 1100 kpps (maximum for 1 Gb/s)
|==========================================================

34
README.md Normal file
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@ -0,0 +1,34 @@
kiss-ntpd
---------
[![Build Status](https://ci.moparisthe.best/job/moparisthebest/job/kiss-ntpd/job/master/badge/icon%3Fstyle=plastic)](https://ci.moparisthe.best/job/moparisthebest/job/kiss-ntpd/job/master/)
[![crates.io](https://img.shields.io/crates/v/kiss-ntpd.svg)](https://crates.io/crates/kiss-ntpd)
An NTP server that Keeps It Simple, Stupid.
It simply responds to NTP queries with the current system time, it doesn't fuss with
leap seconds or stratum or any of those other things we don't care about. It will
simply synchronize your clock to the server's clock rather closely and that's it.
Host this on your router for all your LAN clients, and let systemd-timesyncd or another
ntp client keep that clock in sync.
##### Usage
```
$ kiss-ntpd -h
usage: kiss-ntpd [options...]
-b, --bind address to bind to, default '0.0.0.0:123'
-h, --help print this usage text
-V, -v, --version Show version number then quit
-d, --debug Print packets sent and recieved, very verbose
Environment variable support:
You if environmental variable KISS_NTPD_BIND is set, it is used in place of --bind
Also KISS_NTPD_DEBUG=true can be used in place of --debug
```
There is an example systemd unit in `systemd/kiss-ntpd.service` which runs it with minimal permissions
and as locked down as possible.
Many thanks to [rsntp](https://github.com/mlichvar/rsntp) from which I forked this code.

473
src/main.rs
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@ -1,40 +1,29 @@
// Copyright (C) 2017 Miroslav Lichvar
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
/*
kiss-ntpd: an NTP server that Keeps It Simple, Stupid
Copyright (C) 2017 Miroslav Lichvar
Copyright (C) 2021 Travis Burtrum
extern crate byteorder;
extern crate getopts;
extern crate net2;
extern crate rand;
extern crate privdrop;
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
use std::thread;
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
use std::convert::TryInto;
use std::env;
use std::io;
use std::io::{Error, ErrorKind};
use std::net::{UdpSocket, SocketAddr};
use std::time::{SystemTime, Duration};
use std::sync::{Arc, Mutex};
use byteorder::{BigEndian, ByteOrder};
use getopts::Options;
use net2::UdpBuilder;
use net2::unix::UnixUdpBuilderExt;
use rand::random;
use std::net::{SocketAddr, UdpSocket};
use std::str::FromStr;
use std::time::SystemTime;
#[derive(Debug, Copy, Clone)]
struct NtpTimestamp {
@ -44,31 +33,28 @@ struct NtpTimestamp {
impl NtpTimestamp {
fn now() -> NtpTimestamp {
let now = SystemTime::now();
let dur = now.duration_since(std::time::UNIX_EPOCH).unwrap();
let dur = now.duration_since(std::time::UNIX_EPOCH).unwrap(); // this should be unable to happen
let secs = dur.as_secs() + 2208988800; // 1900 epoch
let nanos = dur.subsec_nanos();
NtpTimestamp{ts: (secs << 32) + (nanos as f64 * 4.294967296) as u64}
NtpTimestamp {
ts: (secs << 32) + (nanos as f64 * 4.294967296) as u64,
}
}
fn zero() -> NtpTimestamp {
NtpTimestamp{ts: 0}
}
fn random() -> NtpTimestamp {
NtpTimestamp{ts: random()}
}
fn diff_to_sec(&self, ts: &NtpTimestamp) -> f64 {
(self.ts - ts.ts) as i64 as f64 / 4294967296.0
NtpTimestamp { ts: 0 }
}
fn read(buf: &[u8]) -> NtpTimestamp {
NtpTimestamp{ts: BigEndian::read_u64(buf)}
// this unwrap can never fail because we always send in exactly 8 bytes
NtpTimestamp {
ts: u64::from_be_bytes(buf.try_into().unwrap()),
}
}
fn write(&self, buf: &mut [u8]) {
BigEndian::write_u64(buf, self.ts);
buf.copy_from_slice(&self.ts.to_be_bytes());
}
}
@ -85,19 +71,18 @@ struct NtpFracValue {
impl NtpFracValue {
fn read(buf: &[u8]) -> NtpFracValue {
NtpFracValue{val: BigEndian::read_u32(buf)}
// this unwrap can never fail because we always send in exactly 4 bytes
NtpFracValue {
val: u32::from_be_bytes(buf.try_into().unwrap()),
}
}
fn write(&self, buf: &mut [u8]) {
BigEndian::write_u32(buf, self.val);
buf.copy_from_slice(&self.val.to_be_bytes());
}
fn zero() -> NtpFracValue {
NtpFracValue{val: 0}
}
fn increment(&mut self) {
self.val += 1;
NtpFracValue { val: 0 }
}
}
@ -141,7 +126,7 @@ impl NtpPacket {
return Err(Error::new(ErrorKind::Other, "Unsupported version"));
}
Ok(NtpPacket{
Ok(NtpPacket {
remote_addr: addr,
local_ts: local_ts,
leap: leap,
@ -152,7 +137,8 @@ impl NtpPacket {
precision: buf[3] as i8,
delay: NtpFracValue::read(&buf[4..8]),
dispersion: NtpFracValue::read(&buf[8..12]),
ref_id: BigEndian::read_u32(&buf[12..16]),
// this unwrap can never fail because we always send in exactly 4 bytes
ref_id: u32::from_be_bytes((&buf[12..16]).try_into().unwrap()),
ref_ts: NtpTimestamp::read(&buf[16..24]),
orig_ts: NtpTimestamp::read(&buf[24..32]),
rx_ts: NtpTimestamp::read(&buf[32..40]),
@ -169,7 +155,7 @@ impl NtpPacket {
buf[3] = self.precision as u8;
self.delay.write(&mut buf[4..8]);
self.dispersion.write(&mut buf[8..12]);
BigEndian::write_u32(&mut buf[12..16], self.ref_id);
&mut buf[12..16].copy_from_slice(&self.ref_id.to_be_bytes());
self.ref_ts.write(&mut buf[16..24]);
self.orig_ts.write(&mut buf[24..32]);
self.rx_ts.write(&mut buf[32..40]);
@ -179,319 +165,182 @@ impl NtpPacket {
}
fn is_request(&self) -> bool {
self.mode == 1 || self.mode == 3 ||
(self.mode == 0 && self.version == 1 && self.remote_addr.port() != 123)
self.mode == 1 || self.mode == 3 || (self.mode == 0 && self.version == 1 && self.remote_addr.port() != 123)
}
fn make_response(&self, state: &NtpServerState) -> Option<NtpPacket> {
fn make_response(&self) -> Option<NtpPacket> {
if !self.is_request() {
return None;
}
Some(NtpPacket{
Some(NtpPacket {
remote_addr: self.remote_addr,
local_ts: NtpTimestamp::zero(),
leap: state.leap,
leap: 0,
version: self.version,
mode: if self.mode == 1 { 2 } else { 4 },
stratum: state.stratum,
stratum: 8,
poll: self.poll,
precision: state.precision,
delay: state.delay,
dispersion: state.dispersion,
ref_id: state.ref_id,
ref_ts: state.ref_ts,
precision: 0,
delay: NtpFracValue::zero(),
dispersion: NtpFracValue::zero(),
ref_id: 0,
ref_ts: NtpTimestamp::now(),
orig_ts: self.tx_ts,
rx_ts: self.local_ts,
tx_ts: NtpTimestamp::now(),
})
}
fn new_request(remote_addr: SocketAddr) -> NtpPacket {
NtpPacket{
remote_addr: remote_addr,
local_ts: NtpTimestamp::now(),
leap: 0,
version: 4,
mode: 3,
stratum: 0,
poll: 0,
precision: 0,
delay: NtpFracValue::zero(),
dispersion: NtpFracValue::zero(),
ref_id: 0,
ref_ts: NtpTimestamp::zero(),
orig_ts: NtpTimestamp::zero(),
rx_ts: NtpTimestamp::zero(),
tx_ts: NtpTimestamp::random(),
}
}
fn is_valid_response(&self, request: &NtpPacket) -> bool {
self.remote_addr == request.remote_addr &&
self.mode == request.mode + 1 &&
self.orig_ts == request.tx_ts
}
fn get_server_state(&self) -> NtpServerState {
NtpServerState{
leap: self.leap,
stratum: self.stratum,
precision: self.precision,
ref_id: self.ref_id,
ref_ts: self.ref_ts,
dispersion: self.dispersion,
delay: self.delay,
}
}
}
#[derive(Copy, Clone)]
struct NtpServerState {
leap: u8,
stratum: u8,
precision: i8,
ref_id: u32,
ref_ts: NtpTimestamp,
dispersion: NtpFracValue,
delay: NtpFracValue,
}
struct NtpServer {
state: Arc<Mutex<NtpServerState>>,
sockets: Vec<UdpSocket>,
server_addr: String,
socket: UdpSocket,
debug: bool,
}
impl NtpServer {
fn new(local_addrs: Vec<String>, server_addr: String, debug: bool) -> NtpServer {
let state = NtpServerState{
leap: 0,
stratum: 0,
precision: 0,
ref_id: 0,
ref_ts: NtpTimestamp::zero(),
dispersion: NtpFracValue::zero(),
delay: NtpFracValue::zero(),
};
let mut sockets = vec![];
for addr in local_addrs {
let sockaddr = addr.parse().unwrap();
let udp_builder = match sockaddr {
SocketAddr::V4(_) => UdpBuilder::new_v4().unwrap(),
SocketAddr::V6(_) => UdpBuilder::new_v6().unwrap(),
};
let udp_builder_ref = match sockaddr {
SocketAddr::V4(_) => &udp_builder,
SocketAddr::V6(_) => udp_builder.only_v6(true).unwrap(),
};
let socket = match udp_builder_ref.reuse_port(true).unwrap().bind(sockaddr) {
Ok(s) => s,
Err(e) => panic!("Couldn't bind socket: {}", e)
};
sockets.push(socket);
}
NtpServer{
state: Arc::new(Mutex::new(state)),
sockets: sockets,
server_addr: server_addr,
fn new(local_addr: String, debug: bool) -> NtpServer {
NtpServer {
socket: UdpSocket::bind(local_addr).expect("could not bind to socket"),
debug: debug,
}
}
fn process_requests(thread_id: u32, debug: bool, socket: UdpSocket, state: Arc<Mutex<NtpServerState>>) {
let mut last_update = NtpTimestamp::now();
let mut cached_state: NtpServerState;
cached_state = *state.lock().unwrap();
println!("Server thread #{} started", thread_id);
fn process_requests(debug: bool, socket: UdpSocket) {
println!("Server thread started");
loop {
match NtpPacket::receive(&socket) {
Ok(request) => {
if debug {
println!("Thread #{} received {:?}", thread_id, request);
println!("received {:?}", request);
}
if request.local_ts.diff_to_sec(&last_update).abs() > 0.1 {
cached_state = *state.lock().unwrap();
last_update = request.local_ts;
if debug {
println!("Thread #{} updated its state", thread_id);
}
}
match request.make_response(&cached_state) {
Some(response) => {
match response.send(&socket) {
Ok(_) => {
if debug {
println!("Thread #{} sent {:?}", thread_id, response);
}
},
Err(e) => println!("Thread #{} failed to send packet to {}: {}",
thread_id, response.remote_addr, e)
match request.make_response() {
Some(response) => match response.send(&socket) {
Ok(_) => {
if debug {
println!("sent {:?}", response);
}
}
Err(e) => println!("failed to send packet to {}: {}", response.remote_addr, e),
},
None => {}
}
},
}
Err(e) => {
println!("Thread #{} failed to receive packet: {}", thread_id, e);
},
println!("failed to receive packet: {}", e);
}
}
}
}
fn update_state(state: Arc<Mutex<NtpServerState>>, addr: SocketAddr, debug: bool) {
let request = NtpPacket::new_request(addr);
let mut new_state: Option<NtpServerState> = None;
let socket = match addr {
SocketAddr::V4(_) => UdpBuilder::new_v4().unwrap().bind("0.0.0.0:0").unwrap(),
SocketAddr::V6(_) => UdpBuilder::new_v6().unwrap().bind("[::]:0").unwrap(),
};
socket.set_read_timeout(Some(Duration::new(1, 0))).unwrap();
match request.send(&socket) {
Ok(_) => {
if debug {
println!("Client sent {:?}", request);
}
},
Err(e) => {
println!("Client failed to send packet: {}", e);
return;
}
}
loop {
let response = match NtpPacket::receive(&socket) {
Ok(packet) => {
if debug {
println!("Client received {:?}", packet);
}
if !packet.is_valid_response(&request) {
println!("Client received unexpected {:?}", packet);
continue;
}
packet
},
Err(e) => {
if debug {
println!("Client failed to receive packet: {}", e);
}
break;
}
};
new_state = Some(response.get_server_state());
break;
}
if let Ok(mut state) = state.lock() {
if let Some(new_state) = new_state {
*state = new_state;
}
state.dispersion.increment();
}
}
fn run(&self) {
let mut threads = vec![];
let mut id = 0;
let quit = false;
for socket in &self.sockets {
id = id + 1;
let state = self.state.clone();
let debug = self.debug;
let cloned_socket = socket.try_clone().unwrap();
threads.push(thread::spawn(move || {NtpServer::process_requests(id, debug, cloned_socket, state); }));
}
while ! quit {
NtpServer::update_state(self.state.clone(), self.server_addr.parse().unwrap(), self.debug);
thread::sleep(Duration::new(1, 0));
}
for thread in threads {
let _ = thread.join();
}
fn run(self) {
NtpServer::process_requests(self.debug, self.socket);
}
}
fn print_usage(opts: Options) {
let brief = format!("Usage: rsntp [OPTIONS]");
print!("{}", opts.usage(&brief));
fn arg_to_env(arg: &str) -> Option<String> {
if !arg.starts_with("--") {
return None;
}
let env = "KISS_NTPD_".to_owned();
let mut env = env + &arg.trim_matches('-').replace("-", "_");
env.make_ascii_uppercase();
Some(env)
}
fn env_for_arg(arg: &str) -> Option<String> {
arg_to_env(arg).and_then(|key| std::env::var(key).ok())
}
pub struct Args<'a> {
args: &'a Vec<String>,
}
impl<'a> Args<'a> {
pub fn new(args: &'a Vec<String>) -> Args {
Args { args }
}
pub fn flag(&self, flag: &'a str) -> bool {
if self.args.contains(&flag.to_owned()) {
return true;
}
// because env we want slightly special handling of empty/0/false
match env_for_arg(flag) {
Some(env) => &env != "" && &env != "0" && &env != "false",
None => false,
}
}
pub fn get_option(&self, flags: &[&'a str]) -> Option<String> {
for flag in flags.iter() {
let mut found = false;
for arg in self.args.iter() {
if found {
return Some(arg.to_owned());
}
if arg == flag {
found = true;
}
}
}
// no matching arguments are found, so check env variables as a fallback
for flag in flags.iter() {
let env = env_for_arg(flag);
if env.is_some() {
return env;
}
}
return None;
}
pub fn get_str(&self, flags: &[&'a str], def: &'a str) -> String {
match self.get_option(flags) {
Some(ret) => ret,
None => def.to_owned(),
}
}
pub fn get<T: FromStr>(&self, flags: &[&'a str], def: T) -> T {
match self.get_option(flags) {
Some(ret) => match ret.parse::<T>() {
Ok(ret) => ret,
Err(_) => def, // or panic
},
None => def,
}
}
}
fn main() {
let args: Vec<String> = env::args().collect();
let mut addrs = Vec::new();
let mut opts = Options::new();
let raw_args = env::args().collect();
let args = Args::new(&raw_args);
opts.optopt("4", "ipv4-threads", "set number of IPv4 server threads (1)", "NUM");
opts.optopt("6", "ipv6-threads", "set number of IPv6 server threads (1)", "NUM");
opts.optopt("a", "ipv4-address", "set local address of IPv4 server sockets (0.0.0.0:123)", "ADDR:PORT");
opts.optopt("b", "ipv6-address", "set local address of IPv6 server sockets ([::]:123)", "ADDR:PORT");
opts.optopt("s", "server-address", "set server address (127.0.0.1:11123)", "ADDR:PORT");
opts.optopt("u", "user", "run as USER", "USER");
opts.optopt("r", "root", "change root directory", "DIR");
opts.optflag("d", "debug", "Enable debug messages");
opts.optflag("h", "help", "Print this help message");
let matches = match opts.parse(&args[1..]) {
Ok(m) => m,
Err(e) => {
println!("{}", e);
print_usage(opts);
return;
}
};
if matches.opt_present("h") {
print_usage(opts);
if args.flag("-V") || args.flag("-v") || args.flag("--version") {
println!("kiss-ntpd {} ", env!("CARGO_PKG_VERSION"));
return;
}
let server_addr = matches.opt_str("s").unwrap_or("127.0.0.1:11123".to_string());
let n4 = matches.opt_str("4").unwrap_or("1".to_string()).parse().unwrap_or(1);
let n6 = matches.opt_str("6").unwrap_or("1".to_string()).parse().unwrap_or(1);
let local_address4 = matches.opt_str("a").unwrap_or("0.0.0.0:123".to_string());
let local_address6 = matches.opt_str("b").unwrap_or("[::]:123".to_string());
let default_udp_host = "0.0.0.0:123";
for _ in 0..n4 {
addrs.push(local_address4.clone());
let bind = args.get_str(&["-b", "--bind"], default_udp_host).to_owned();
if args.flag("-h") || args.flag("--help") {
println!(
r#"usage: kiss-ntpd [options...]
-b, --bind address to bind to, default '{}'
-h, --help print this usage text
-V, -v, --version Show version number then quit
-d, --debug Print packets sent and recieved, very verbose
Environment variable support:
You if environmental variable KISS_NTPD_BIND is set, it is used in place of --bind
Also KISS_NTPD_DEBUG=true can be used in place of --debug
"#,
default_udp_host
);
return;
}
for _ in 0..n6 {
addrs.push(local_address6.clone());
}
let server = NtpServer::new(addrs, server_addr, matches.opt_present("d"));
if matches.opts_present(&["r".to_string(), "u".to_string()]) {
privdrop::PrivDrop::default()
.chroot(matches.opt_str("r").unwrap_or("/".to_string()))
.user(&matches.opt_str("u").unwrap_or("root".to_string()))
.unwrap_or_else(|e| { panic!("Couldn't set user: {}", e) })
.apply()
.unwrap_or_else(|e| { panic!("Couldn't drop privileges: {}", e) });
}
let server = NtpServer::new(bind, args.flag("-d") || args.flag("--debug"));
server.run();
}

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systemd/kiss-ntpd.service Normal file
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[Unit]
Description=kiss-ntpd NTP daemon
After=network-online.target
Wants=network-online.target
StartLimitIntervalSec=0
Documentation=https://code.moparisthebest.com/moparisthebest/kiss-ntpd
Documentation=https://github.com/moparisthebest/kiss-ntpd
[Service]
ExecStart=/usr/bin/kiss-ntpd
Restart=always
RestartSec=1s
# anything under here isn't strictly needed, but probably good
# to lock this down with the minimal permissions necessary
# which are not many at all
User=kiss-ntpd
DynamicUser=yes
ProtectSystem=strict
ProtectHome=true
PrivateTmp=true
PrivateDevices=true
ProtectHostname=true
ProtectKernelTunables=true
ProtectKernelModules=true
ProtectKernelLogs=true
ProtectControlGroups=true
RestrictAddressFamilies=AF_INET AF_INET6
RestrictNamespaces=net
LockPersonality=true
MemoryDenyWriteExecute=true
RestrictRealtime=true
RestrictSUIDSGID=true
RemoveIPC=true
SystemCallArchitectures=native
# these are just needed to bind to low ports
CapabilityBoundingSet=CAP_NET_BIND_SERVICE
AmbientCapabilities=CAP_NET_BIND_SERVICE
[Install]
WantedBy=multi-user.target