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|
use std::collections::HashSet;
use std::net::{Ipv4Addr, Ipv6Addr};
use std::sync::Arc;
use std::time::Duration;
use anyhow::{anyhow, bail, Result};
use tokio::select;
use tokio::sync::watch;
use tracing::*;
use crate::dns_config::*;
use crate::DomainProvider;
const RETRY_DELAY: Duration = Duration::from_secs(600); // 10 minutes
pub async fn dns_updater_task(
mut rx_dns_config: watch::Receiver<Arc<DnsConfig>>,
providers: Vec<DomainProvider>,
allowed_domains: Vec<String>,
mut must_exit: watch::Receiver<bool>,
) {
for dom in allowed_domains.iter() {
info!(domain = dom, "allowing subdomains of domain");
}
for prov in providers.iter() {
info!(
domain = prov.domain,
provider = prov.provider.provider(),
"got provider for domain"
);
}
info!("DNS updater starting");
let mut config = Arc::new(DnsConfig::new());
let mut failures = HashSet::new();
while !*must_exit.borrow() {
select!(
c = rx_dns_config.changed() => {
if c.is_err() {
break;
}
}
_ = tokio::time::sleep(RETRY_DELAY) => {
if failures.is_empty() {
continue;
}
}
_ = must_exit.changed() => continue,
);
// Always lag 15 seconds behind actual updates,
// to avoid sending too many at once and hitting rate limits
tokio::time::sleep(Duration::from_secs(15)).await;
let new_config: Arc<DnsConfig> = rx_dns_config.borrow_and_update().clone();
let mut new_failures = HashSet::new();
for (key, value) in new_config.entries.iter() {
if failures.contains(key) {
info!(
record = key.to_string(),
target = value.to_string(),
"retrying after failure"
);
} else if config.entries.get(key) == Some(value) {
// Skip entries that haven't changed, and that were
// successfully updated on the previous iteration
continue;
}
// Skip entries for unallowed domains
if !allowed_domains
.iter()
.any(|d| key.dns_path == *d || key.dns_path.ends_with(&format!(".{}", d)))
{
error!(
domain = key.dns_path,
"domain/subdomain/hostname not in allowed list",
);
continue;
}
let provider = providers.iter().find(|p| {
key.dns_path == p.domain || key.dns_path.ends_with(&format!(".{}", p.domain))
});
if let Some(provider) = provider {
if let Err(e) = update_dns_entry(key, value, provider).await {
error!(
record = key.to_string(),
target = value.to_string(),
error = e.to_string(),
"unable to update record, will retry later"
);
new_failures.insert(key.clone());
}
} else {
error!(
domain = key.dns_path,
"no provider matches this domain/subdomain/hostname"
);
}
}
config = new_config;
failures = new_failures;
}
}
async fn update_dns_entry(
key: &DnsEntryKey,
value: &DnsEntryValue,
provider: &DomainProvider,
) -> Result<()> {
let subdomain = if key.dns_path == provider.domain {
None
} else {
Some(
key.dns_path
.strip_suffix(&format!(".{}", provider.domain))
.unwrap(),
)
};
info!(
record = key.to_string(),
target = value.to_string(),
domain = provider.domain,
subdomain = &subdomain,
provider = provider.provider.provider(),
"updating record"
);
if value.targets.is_empty() {
bail!("zero targets (internal error)");
}
match key.record_type {
DnsRecordType::A => {
let mut targets = vec![];
for tgt in value.targets.iter() {
targets.push(
tgt.parse::<Ipv4Addr>()
.map_err(|_| anyhow!("Invalid ipv4 address: {}", tgt))?,
);
}
provider
.provider
.update_a(&provider.domain, subdomain, &targets)
.await?;
}
DnsRecordType::AAAA => {
let mut targets = vec![];
for tgt in value.targets.iter() {
targets.push(
tgt.parse::<Ipv6Addr>()
.map_err(|_| anyhow!("Invalid ipv6 address: {}", tgt))?,
);
}
provider
.provider
.update_aaaa(&provider.domain, subdomain, &targets)
.await?;
}
DnsRecordType::CNAME => {
let mut targets = value.targets.iter().cloned().collect::<Vec<_>>();
if targets.len() > 1 {
targets.sort();
warn!(
record = key.to_string(),
all_targets = value.to_string(),
selected_target = targets[0],
"Several CNAME targets, taking first one in alphabetical order. Consider switching to a single global target instead."
);
}
provider
.provider
.update_cname(&provider.domain, subdomain, &targets[0])
.await?;
}
}
Ok(())
}
|
