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Support for loading IP addresses from DiploNAT autodiscovery

This commit is contained in:
Alex 2023-04-05 15:38:16 +02:00
parent aaff9b7d4a
commit 0ed9edefee
6 changed files with 187 additions and 72 deletions
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1
Cargo.lock generated
View File

@ -106,6 +106,7 @@ dependencies = [
"futures",
"reqwest",
"serde",
"serde_json",
"structopt",
"tokio",
"tracing",

13
Cargo.nix
View File

@ -23,7 +23,7 @@ args@{
ignoreLockHash,
}:
let
nixifiedLockHash = "66706604b5c3f270cb3a6b72cb23bf3abba94b9d03fed4048584d92e89851d54";
nixifiedLockHash = "f8fd87706eb1709f2cf3a695f4400e1a5e130e3c599cdfebc00bba51c80f494f";
workspaceSrc = if args.workspaceSrc == null then ./. else args.workspaceSrc;
currentLockHash = builtins.hashFile "sha256" (workspaceSrc + /Cargo.lock);
lockHashIgnored = if ignoreLockHash
@ -188,10 +188,11 @@ in
dependencies = {
anyhow = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".anyhow."1.0.66" { inherit profileName; }).out;
async_trait = (buildRustPackages."registry+https://github.com/rust-lang/crates.io-index".async-trait."0.1.59" { profileName = "__noProfile"; }).out;
df_consul = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".df-consul."0.2.0" { inherit profileName; }).out;
df_consul = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".df-consul."0.3.3" { inherit profileName; }).out;
futures = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".futures."0.3.25" { inherit profileName; }).out;
reqwest = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".reqwest."0.11.13" { inherit profileName; }).out;
serde = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".serde."1.0.149" { inherit profileName; }).out;
serde_json = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".serde_json."1.0.89" { inherit profileName; }).out;
structopt = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".structopt."0.3.26" { inherit profileName; }).out;
tokio = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".tokio."1.23.0" { inherit profileName; }).out;
tracing = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".tracing."0.1.37" { inherit profileName; }).out;
@ -199,17 +200,19 @@ in
};
});
"registry+https://github.com/rust-lang/crates.io-index".df-consul."0.2.0" = overridableMkRustCrate (profileName: rec {
"registry+https://github.com/rust-lang/crates.io-index".df-consul."0.3.3" = overridableMkRustCrate (profileName: rec {
name = "df-consul";
version = "0.2.0";
version = "0.3.3";
registry = "registry+https://github.com/rust-lang/crates.io-index";
src = fetchCratesIo { inherit name version; sha256 = "a351d00f138e768845cdefb9ae27b79aeed97c698745c73bb2805cad1167aa81"; };
src = fetchCratesIo { inherit name version; sha256 = "0e38cfbab431b53dfd2d09f2a9902510c636d3d7397645bac5cf1959cfde2999"; };
dependencies = {
anyhow = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".anyhow."1.0.66" { inherit profileName; }).out;
bytes = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".bytes."1.3.0" { inherit profileName; }).out;
futures = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".futures."0.3.25" { inherit profileName; }).out;
log = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".log."0.4.17" { inherit profileName; }).out;
reqwest = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".reqwest."0.11.13" { inherit profileName; }).out;
serde = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".serde."1.0.149" { inherit profileName; }).out;
tokio = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".tokio."1.23.0" { inherit profileName; }).out;
};
});

1
Cargo.toml
View File

@ -16,5 +16,6 @@ structopt = "0.3"
tokio = { version = "1.22", default-features = false, features = ["rt", "rt-multi-thread", "io-util", "net", "time", "macros", "sync", "signal", "fs"] }
reqwest = { version = "0.11", default-features = false, features = ["json", "rustls-tls-webpki-roots" ] }
serde = { version = "1.0.107", features = ["derive"] }
serde_json = "1.0"
df-consul = "0.3.3"

2
run_local.sh
View File

@ -1,6 +1,6 @@
#!/bin/sh
RUST_LOG=d53=info cargo run \
RUST_LOG=d53=debug cargo run \
-- \
--consul-addr http://localhost:8500 \
--providers deuxfleurs.org:gandi \

240
src/dns_config.rs
View File

@ -1,17 +1,21 @@
use std::collections::{HashMap, HashSet};
use std::fmt;
use std::net::{Ipv4Addr, Ipv6Addr};
use std::sync::Arc;
use std::time::Duration;
use std::time::{Duration, SystemTime};
use anyhow::Result;
use serde::{Deserialize, Serialize};
use tokio::{select, sync::watch};
use tracing::*;
use df_consul::*;
const IPV4_TARGET_METADATA_TAG: &str = "public_ipv4";
const IPV6_TARGET_METADATA_TAG: &str = "public_ipv6";
const IP_TARGET_METADATA_TAG_PREFIX: &str = "public_";
const CNAME_TARGET_METADATA_TAG: &str = "cname_target";
const AUTODISCOVERY_CACHE_DURATION: u64 = 600; // 10 minutes
// ---- Extract DNS config from Consul catalog ----
#[derive(Debug, Eq, PartialEq, Default)]
@ -54,86 +58,192 @@ impl DnsConfig {
}
}
fn parse_d53_tag(tag: &str, node: &catalog::Node) -> Option<(DnsEntryKey, DnsEntryValue)> {
let splits = tag.split(' ').collect::<Vec<_>>();
if splits.len() != 2 {
return None;
}
let (record_type, targets) = match splits[0] {
"d53-a" => match node.meta.get(IPV4_TARGET_METADATA_TAG) {
Some(tgt) => (DnsRecordType::A, [tgt.to_string()].into_iter().collect()),
None => {
warn!("Got d53-a tag `{}` but node {} does not have a {} metadata value. Tag is ignored.", tag, node.node, IPV4_TARGET_METADATA_TAG);
return None;
}
},
"d53-aaaa" => match node.meta.get(IPV6_TARGET_METADATA_TAG) {
Some(tgt) => (DnsRecordType::AAAA, [tgt.to_string()].into_iter().collect()),
None => {
warn!("Got d53-aaaa tag `{}` but node {} does not have a {} metadata value. Tag is ignored.", tag, node.node, IPV6_TARGET_METADATA_TAG);
return None;
}
},
"d53-cname" => match node.meta.get(CNAME_TARGET_METADATA_TAG) {
Some(tgt) => (
DnsRecordType::CNAME,
[tgt.to_string()].into_iter().collect(),
),
None => {
warn!("Got d53-cname tag `{}` but node {} does not have a {} metadata value. Tag is ignored.", tag, node.node, CNAME_TARGET_METADATA_TAG);
return None;
}
},
_ => return None,
};
Some((
DnsEntryKey {
dns_path: splits[1].to_string(),
record_type,
},
DnsEntryValue { targets },
))
}
// ---- fetcher and autodiscovery cache ----
pub fn spawn_dns_config_task(
consul: &Consul,
mut must_exit: watch::Receiver<bool>,
consul: Consul,
must_exit: watch::Receiver<bool>,
) -> watch::Receiver<Arc<DnsConfig>> {
let (tx, rx) = watch::channel(Arc::new(DnsConfig::new()));
let mut catalog_rx = consul.watch_all_service_health(Duration::from_secs(60));
let fetcher = DnsConfigFetcher {
consul,
node_ipv4_cache: HashMap::new(),
node_ipv6_cache: HashMap::new(),
};
tokio::spawn(fetcher.task(tx, must_exit));
rx
}
struct DnsConfigFetcher {
consul: Consul,
node_ipv4_cache: HashMap<String, (u64, Option<Ipv4Addr>)>,
node_ipv6_cache: HashMap<String, (u64, Option<Ipv6Addr>)>,
}
impl DnsConfigFetcher {
async fn task(
mut self,
tx: watch::Sender<Arc<DnsConfig>>,
mut must_exit: watch::Receiver<bool>,
) {
let mut catalog_rx = self
.consul
.watch_all_service_health(Duration::from_secs(60));
tokio::spawn(async move {
while !*must_exit.borrow() {
select! {
_ = catalog_rx.changed() => (),
_ = must_exit.changed() => continue,
};
let services = catalog_rx.borrow_and_update();
let services = catalog_rx.borrow_and_update().clone();
match self.parse_catalog(&services).await {
Ok(dns_config) => tx.send(Arc::new(dns_config)).expect("Internal error"),
Err(e) => {
error!("Error when parsing tags: {}", e);
}
};
}
}
let mut dns_config = DnsConfig::new();
for (_svc, nodes) in services.iter() {
for node in nodes.iter() {
// Do not take into account backends if any have status critical
if node.checks.iter().any(|x| x.status == "critical") {
continue;
}
for tag in node.service.tags.iter() {
if let Some((k, v)) = parse_d53_tag(tag, &node.node) {
dns_config.add(k, v);
}
async fn parse_catalog(&mut self, services: &catalog::AllServiceHealth) -> Result<DnsConfig> {
let mut dns_config = DnsConfig::new();
for (_svc, nodes) in services.iter() {
for node in nodes.iter() {
// Do not take into account backends if any have status critical
if node.checks.iter().any(|x| x.status == "critical") {
continue;
}
for tag in node.service.tags.iter() {
if let Some((k, v)) = self.parse_d53_tag(tag, &node.node).await? {
dns_config.add(k, v);
}
}
}
tx.send(Arc::new(dns_config)).expect("Internal error");
}
});
rx
Ok(dns_config)
}
async fn parse_d53_tag(
&mut self,
tag: &str,
node: &catalog::Node,
) -> Result<Option<(DnsEntryKey, DnsEntryValue)>> {
let splits = tag.split(' ').collect::<Vec<_>>();
if splits.len() != 2 {
return Ok(None);
}
let (record_type, targets) = match splits[0] {
"d53-a" => match self.get_node_ipv4(&node).await? {
Some(tgt) => (DnsRecordType::A, [tgt.to_string()].into_iter().collect()),
None => {
warn!("Got d53-a tag `{}` but node {} does not appear to have a known public IPv4 address. Tag is ignored.", tag, node.node);
return Ok(None);
}
},
"d53-aaaa" => match self.get_node_ipv6(&node).await? {
Some(tgt) => (DnsRecordType::AAAA, [tgt.to_string()].into_iter().collect()),
None => {
warn!("Got d53-aaaa tag `{}` but node {} does not appear to have a known public IPv6 address. Tag is ignored.", tag, node.node);
return Ok(None);
}
},
"d53-cname" => match node.meta.get(CNAME_TARGET_METADATA_TAG) {
Some(tgt) => (
DnsRecordType::CNAME,
[tgt.to_string()].into_iter().collect(),
),
None => {
warn!("Got d53-cname tag `{}` but node {} does not have a {} metadata value. Tag is ignored.", tag, node.node, CNAME_TARGET_METADATA_TAG);
return Ok(None);
}
},
_ => return Ok(None),
};
Ok(Some((
DnsEntryKey {
dns_path: splits[1].to_string(),
record_type,
},
DnsEntryValue { targets },
)))
}
async fn get_node_ipv4(&mut self, node: &catalog::Node) -> Result<Option<Ipv4Addr>> {
Self::get_node_ip(&self.consul, "ipv4", &mut self.node_ipv4_cache, node).await
}
async fn get_node_ipv6(&mut self, node: &catalog::Node) -> Result<Option<Ipv6Addr>> {
Self::get_node_ip(&self.consul, "ipv6", &mut self.node_ipv6_cache, node).await
}
async fn get_node_ip<A>(
consul: &Consul,
family: &str,
cache: &mut HashMap<String, (u64, Option<A>)>,
node: &catalog::Node,
) -> Result<Option<A>>
where
A: Serialize + for<'de> Deserialize<'de> + std::fmt::Debug + std::str::FromStr + Copy + Eq,
<A as std::str::FromStr>::Err: Send + Sync + std::error::Error + 'static,
{
match cache.get(&node.node) {
Some((t, a)) if timestamp() <= t + AUTODISCOVERY_CACHE_DURATION => Ok(*a),
_ => {
let kv_key = format!("diplonat/autodiscovery/{}/{}", family, node.node);
let autodiscovery = consul.kv_get(&kv_key).await?;
if let Some(json) = autodiscovery {
let a = serde_json::from_slice::<DiplonatAutodiscoveryResult<A>>(&json)?;
if timestamp() <= a.timestamp + AUTODISCOVERY_CACHE_DURATION {
if cache.get(&node.node).map(|x| x.1) != Some(a.address) {
info!(
"Got {} address for {} from diplonat autodiscovery: {:?}",
family, node.node, a.address
);
}
cache.insert(node.node.clone(), (a.timestamp, a.address));
return Ok(a.address);
} else {
warn!("{} address for {} from diplonat autodiscovery is outdated (value: {:?}), falling back on value from Consul node meta", family, node.node, a.address);
}
}
let meta_tag = format!("{}{}", IP_TARGET_METADATA_TAG_PREFIX, family);
let a = node.meta.get(&meta_tag).map(|x| x.parse()).transpose()?;
if cache.get(&node.node).map(|x| x.1) != Some(a) {
info!(
"Got {} address for {} from Consul node meta: {:?}",
family, node.node, a
);
}
cache.insert(node.node.clone(), (timestamp(), a));
Ok(a)
}
}
}
}
// ---- util for interaction with diplonat ----
#[derive(Serialize, Deserialize, Debug)]
pub struct DiplonatAutodiscoveryResult<A> {
pub timestamp: u64,
pub address: Option<A>,
}
fn timestamp() -> u64 {
SystemTime::now()
.duration_since(SystemTime::UNIX_EPOCH)
.expect("clock error")
.as_secs()
}
// ---- Display impls ----

2
src/main.rs
View File

@ -111,7 +111,7 @@ async fn main() {
.map(ToString::to_string)
.collect::<Vec<_>>();
let rx_dns_config = dns_config::spawn_dns_config_task(&consul, exit_signal.clone());
let rx_dns_config = dns_config::spawn_dns_config_task(consul, exit_signal.clone());
let updater_task = tokio::spawn(dns_updater::dns_updater_task(
rx_dns_config.clone(),