durnitisp/src/icmp.rs

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// Copyright 2020 Jeremy Wall
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::sync::{Arc, RwLock};
use std::time::Duration;
use crate::util;
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use ekko::{Ekko, EkkoResponse};
use gflags;
use log::{error, info};
use prometheus::{CounterVec, IntGaugeVec};
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gflags::define! {
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/// The size in bytes of the ping requests.
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--pingPayload = "durnitisp"
}
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gflags::define! {
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/// The size in bytes of the ping requests.
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--pingTTL: u32 = 113
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}
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gflags::define! {
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/// The size in bytes of the ping requests.
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--pingTimeout: u64 = 2048
}
gflags::define! {
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/// The size in bytes of the ping requests.
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--maxHops: u8 = 50
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}
fn resolve_host_address(host: &str) -> String {
format!("{}", util::resolve_hosts(&vec![host]).unwrap().first().unwrap().unwrap())
}
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pub fn start_echo_loop(
domain_name: &str,
stop_signal: Arc<RwLock<bool>>,
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ping_latency_guage: IntGaugeVec,
ping_counter: CounterVec,
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) {
let resolved = resolve_host_address(domain_name);
info!("Attempting to ping domain {} at address: {}", domain_name, resolved);
let mut sender = Ekko::with_target(&resolved).unwrap();
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loop {
{
// Limit the scope of this lock
if *stop_signal.read().unwrap() {
info!("Stopping ping thread for {}", domain_name);
return;
}
}
match sender
.send_with_timeout(MAXHOPS.flag, Some(Duration::from_millis(PINGTIMEOUT.flag))) {
Ok(r) => match r {
EkkoResponse::DestinationResponse(r) => {
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let elapsed = r.elapsed.as_millis();
info!(
"ICMP: Reply from {}: time={}ms",
r.address.unwrap(),
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elapsed,
);
ping_counter
.with(&prometheus::labels! {"result" => "ok", "domain" => domain_name})
.inc();
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if elapsed != 0 {
ping_latency_guage
.with(&prometheus::labels! {"domain" => domain_name})
.set(r.elapsed.as_millis() as i64);
}
}
EkkoResponse::UnreachableResponse((_, ref _code)) => {
// If we got unreachable we need to set up a new sender.
error!("{:?}", r);
info!("Restarting our sender");
ping_counter
.with(&prometheus::labels! {"result" => "unreachable", "domain" => domain_name})
.inc();
let resolved = resolve_host_address(domain_name);
let mut new_sender = Ekko::with_target(&resolved).unwrap();
std::mem::swap(&mut sender, &mut new_sender);
}
EkkoResponse::ExceededResponse(_) => {
ping_counter
.with(&prometheus::labels! {"result" => "timeout", "domain" => domain_name})
.inc();
}
_ => {
ping_counter
.with(&prometheus::labels! {"result" => "err", "domain" => domain_name})
.inc();
error!("{:?}", r);
}
},
Err(e) => {
ping_counter
.with(&prometheus::labels! {"result" => "err", "domain" => domain_name})
.inc();
error!("Ping send to domain: {} address: {} failed: {:?}, Trying again later", domain_name, &resolved, e);
}
};
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std::thread::sleep(Duration::from_secs(3));
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}
}