use crate::{
CAARecord, DnsRecord, DnsRecordType, Error, IntoFqdn, KeyValue, MXRecord, SRVRecord,
TLSARecord, TlsaCertUsage, TlsaMatching, TlsaSelector,
http::{HttpClient, HttpClientBuilder},
utils::txt_chunks_to_text,
};
use base64::{Engine as _, engine::general_purpose::STANDARD as B64};
use serde::{Deserialize, Serialize};
use std::time::Duration;
const DEFAULT_API_ENDPOINT: &str = "https://api.luadns.com";
const PAGE_SIZE: u32 = 500;
#[derive(Clone)]
pub struct LuaDnsProvider {
client: HttpClient,
endpoint: String,
}
#[derive(Deserialize, Debug, Clone)]
pub struct LuaZone {
pub id: i64,
pub name: String,
}
#[derive(Serialize, Deserialize, Debug, Clone)]
pub struct LuaRecord {
#[serde(default, skip_serializing_if = "Option::is_none")]
pub id: Option<i64>,
pub name: String,
#[serde(rename = "type")]
pub rr_type: String,
pub content: String,
pub ttl: u32,
#[serde(default, skip_serializing_if = "Option::is_none")]
pub zone_id: Option<i64>,
}
impl LuaDnsProvider {
pub(crate) fn new(
api_username: impl AsRef<str>,
api_token: impl AsRef<str>,
timeout: Option<Duration>,
) -> Self {
let raw = format!("{}:{}", api_username.as_ref(), api_token.as_ref());
let encoded = B64.encode(raw);
let client = HttpClientBuilder::default()
.with_header("Authorization", format!("Basic {encoded}"))
.with_header("Accept", "application/json")
.with_timeout(timeout)
.build();
Self {
client,
endpoint: DEFAULT_API_ENDPOINT.to_string(),
}
}
#[cfg(test)]
pub(crate) fn with_endpoint(self, endpoint: impl AsRef<str>) -> Self {
Self {
endpoint: endpoint.as_ref().to_string(),
..self
}
}
async fn list_zones(&self) -> crate::Result<Vec<LuaZone>> {
let mut out: Vec<LuaZone> = Vec::new();
let mut page: u32 = 1;
loop {
let chunk: Vec<LuaZone> = self
.client
.get(format!(
"{}/v1/zones?limit={PAGE_SIZE}&page={page}",
self.endpoint
))
.send_with_retry(3)
.await?;
let received = chunk.len();
out.extend(chunk);
if (received as u32) < PAGE_SIZE {
break;
}
page += 1;
}
Ok(out)
}
async fn find_zone(&self, origin: &str) -> crate::Result<LuaZone> {
let zones = self.list_zones().await?;
zones
.into_iter()
.find(|z| z.name.eq_ignore_ascii_case(origin))
.ok_or_else(|| Error::Api(format!("LuaDNS zone {origin} not found")))
}
async fn list_records(&self, zone_id: i64) -> crate::Result<Vec<LuaRecord>> {
let mut out: Vec<LuaRecord> = Vec::new();
let mut page: u32 = 1;
loop {
let chunk: Vec<LuaRecord> = self
.client
.get(format!(
"{}/v1/zones/{zone_id}/records?limit={PAGE_SIZE}&page={page}",
self.endpoint
))
.send_with_retry(3)
.await?;
let received = chunk.len();
out.extend(chunk);
if (received as u32) < PAGE_SIZE {
break;
}
page += 1;
}
Ok(out)
}
async fn list_at(
&self,
zone_id: i64,
fqdn: &str,
record_type: DnsRecordType,
) -> crate::Result<Vec<LuaRecord>> {
let target = fqdn.trim_end_matches('.');
let rr_type = record_type.as_str();
let records = self.list_records(zone_id).await?;
Ok(records
.into_iter()
.filter(|r| r.rr_type == rr_type && r.name.trim_end_matches('.') == target)
.collect())
}
pub(crate) async fn set_rrset(
&self,
name: impl IntoFqdn<'_>,
record_type: DnsRecordType,
ttl: u32,
records: Vec<DnsRecord>,
origin: impl IntoFqdn<'_>,
) -> crate::Result<()> {
check_record_types(record_type, &records)?;
let origin_name = origin.into_name().to_string();
let zone = self.find_zone(&origin_name).await?;
let fqdn = name.into_fqdn().to_string();
let desired = build_contents(record_type, records)?;
let mut existing_pool = self.list_at(zone.id, &fqdn, record_type).await?;
let mut to_add = Vec::new();
for content in desired {
if let Some(idx) = existing_pool.iter().position(|r| r.content == content) {
existing_pool.swap_remove(idx);
} else {
to_add.push(content);
}
}
for entry in existing_pool {
if let Some(id) = entry.id {
self.delete_record(zone.id, id).await?;
}
}
for content in to_add {
self.create_raw(zone.id, &fqdn, record_type, ttl, content)
.await?;
}
Ok(())
}
pub(crate) async fn add_to_rrset(
&self,
name: impl IntoFqdn<'_>,
record_type: DnsRecordType,
ttl: u32,
records: Vec<DnsRecord>,
origin: impl IntoFqdn<'_>,
) -> crate::Result<()> {
check_record_types(record_type, &records)?;
if records.is_empty() {
return Ok(());
}
let origin_name = origin.into_name().to_string();
let zone = self.find_zone(&origin_name).await?;
let fqdn = name.into_fqdn().to_string();
let desired = build_contents(record_type, records)?;
let existing = self.list_at(zone.id, &fqdn, record_type).await?;
for content in desired {
if existing.iter().any(|r| r.content == content) {
continue;
}
self.create_raw(zone.id, &fqdn, record_type, ttl, content)
.await?;
}
Ok(())
}
pub(crate) async fn remove_from_rrset(
&self,
name: impl IntoFqdn<'_>,
record_type: DnsRecordType,
records: Vec<DnsRecord>,
origin: impl IntoFqdn<'_>,
) -> crate::Result<()> {
check_record_types(record_type, &records)?;
if records.is_empty() {
return Ok(());
}
let origin_name = origin.into_name().to_string();
let zone = self.find_zone(&origin_name).await?;
let fqdn = name.into_fqdn().to_string();
let to_remove = build_contents(record_type, records)?;
let existing = self.list_at(zone.id, &fqdn, record_type).await?;
for content in to_remove {
if let Some(entry) = existing.iter().find(|r| r.content == content)
&& let Some(id) = entry.id
{
self.delete_record(zone.id, id).await?;
}
}
Ok(())
}
pub(crate) async fn list_rrset(
&self,
name: impl IntoFqdn<'_>,
record_type: DnsRecordType,
origin: impl IntoFqdn<'_>,
) -> crate::Result<Vec<DnsRecord>> {
let origin_name = origin.into_name().to_string();
let zone = self.find_zone(&origin_name).await?;
let fqdn = name.into_fqdn().to_string();
let listed = self.list_at(zone.id, &fqdn, record_type).await?;
listed
.into_iter()
.map(|r| parse_content(record_type, &r.content))
.collect()
}
async fn create_raw(
&self,
zone_id: i64,
fqdn: &str,
record_type: DnsRecordType,
ttl: u32,
content: String,
) -> crate::Result<()> {
let body = LuaRecord {
id: None,
name: fqdn.to_string(),
rr_type: record_type.as_str().to_string(),
content,
ttl,
zone_id: None,
};
self.client
.post(format!("{}/v1/zones/{zone_id}/records", self.endpoint))
.with_body(&body)?
.send_with_retry::<LuaRecord>(3)
.await
.map(|_| ())
}
async fn delete_record(&self, zone_id: i64, record_id: i64) -> crate::Result<()> {
self.client
.delete(format!(
"{}/v1/zones/{zone_id}/records/{record_id}",
self.endpoint
))
.send_raw()
.await
.map(|_| ())
}
}
fn ensure_dot(name: String) -> String {
if name.ends_with('.') {
name
} else {
format!("{name}.")
}
}
fn render_content(record: DnsRecord) -> String {
match record {
DnsRecord::A(addr) => addr.to_string(),
DnsRecord::AAAA(addr) => addr.to_string(),
DnsRecord::CNAME(content) => ensure_dot(content),
DnsRecord::NS(content) => ensure_dot(content),
DnsRecord::TXT(content) => {
let mut out = String::with_capacity(content.len() + 4);
txt_chunks_to_text(&mut out, &content, " ");
out
}
DnsRecord::MX(mx) => format!("{} {}", mx.priority, ensure_dot(mx.exchange)),
DnsRecord::SRV(srv) => format!(
"{} {} {} {}",
srv.priority,
srv.weight,
srv.port,
ensure_dot(srv.target)
),
DnsRecord::TLSA(tlsa) => tlsa.to_string(),
DnsRecord::CAA(caa) => caa.to_string(),
}
}
fn build_contents(
expected_type: DnsRecordType,
records: Vec<DnsRecord>,
) -> crate::Result<Vec<String>> {
let mut out = Vec::with_capacity(records.len());
for record in records {
if record.as_type() != expected_type {
return Err(Error::Api(format!(
"RRSet record type mismatch: expected {}, got {}",
expected_type.as_str(),
record.as_type().as_str(),
)));
}
out.push(render_content(record));
}
Ok(out)
}
fn check_record_types(expected: DnsRecordType, records: &[DnsRecord]) -> crate::Result<()> {
for r in records {
if r.as_type() != expected {
return Err(Error::Api(format!(
"RRSet record type mismatch: expected {}, got {}",
expected.as_str(),
r.as_type().as_str(),
)));
}
}
Ok(())
}
fn parse_content(record_type: DnsRecordType, content: &str) -> crate::Result<DnsRecord> {
Ok(match record_type {
DnsRecordType::A => DnsRecord::A(
content
.parse()
.map_err(|e| Error::Parse(format!("invalid A value '{content}': {e}")))?,
),
DnsRecordType::AAAA => DnsRecord::AAAA(
content
.parse()
.map_err(|e| Error::Parse(format!("invalid AAAA value '{content}': {e}")))?,
),
DnsRecordType::CNAME => DnsRecord::CNAME(strip_trailing_dot(content)),
DnsRecordType::NS => DnsRecord::NS(strip_trailing_dot(content)),
DnsRecordType::MX => parse_mx(content)?,
DnsRecordType::TXT => DnsRecord::TXT(parse_txt(content)),
DnsRecordType::SRV => parse_srv(content)?,
DnsRecordType::TLSA => parse_tlsa(content)?,
DnsRecordType::CAA => parse_caa(content)?,
})
}
fn parse_mx(value: &str) -> crate::Result<DnsRecord> {
let mut parts = value.splitn(2, char::is_whitespace);
let priority = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid MX value '{value}'")))?
.parse()
.map_err(|e| Error::Parse(format!("invalid MX priority in '{value}': {e}")))?;
let exchange = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid MX value '{value}'")))?
.trim();
Ok(DnsRecord::MX(MXRecord {
priority,
exchange: strip_trailing_dot(exchange),
}))
}
fn parse_srv(value: &str) -> crate::Result<DnsRecord> {
let mut parts = value.split_whitespace();
let priority = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid SRV value '{value}'")))?
.parse()
.map_err(|e| Error::Parse(format!("invalid SRV priority in '{value}': {e}")))?;
let weight = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid SRV value '{value}'")))?
.parse()
.map_err(|e| Error::Parse(format!("invalid SRV weight in '{value}': {e}")))?;
let port = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid SRV value '{value}'")))?
.parse()
.map_err(|e| Error::Parse(format!("invalid SRV port in '{value}': {e}")))?;
let target = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid SRV value '{value}'")))?;
Ok(DnsRecord::SRV(SRVRecord {
priority,
weight,
port,
target: strip_trailing_dot(target),
}))
}
fn parse_txt(value: &str) -> String {
let trimmed = value.trim();
let mut out = String::with_capacity(trimmed.len());
let mut bytes = trimmed.bytes().peekable();
while let Some(&b) = bytes.peek() {
if b != b'"' {
bytes.next();
continue;
}
bytes.next();
loop {
match bytes.next() {
Some(b'"') => break,
Some(b'\\') => {
if let Some(next) = bytes.next() {
out.push(next as char);
}
}
Some(other) => out.push(other as char),
None => break,
}
}
}
if out.is_empty() && !trimmed.is_empty() && !trimmed.starts_with('"') {
return trimmed.to_string();
}
out
}
fn parse_tlsa(content: &str) -> crate::Result<DnsRecord> {
let mut parts = content.split_whitespace();
let usage: u8 = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid TLSA record: {content}")))?
.parse()
.map_err(|e| Error::Parse(format!("invalid TLSA usage: {e}")))?;
let selector: u8 = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid TLSA record: {content}")))?
.parse()
.map_err(|e| Error::Parse(format!("invalid TLSA selector: {e}")))?;
let matching: u8 = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid TLSA record: {content}")))?
.parse()
.map_err(|e| Error::Parse(format!("invalid TLSA matching: {e}")))?;
let hex: String = parts.collect::<Vec<_>>().join("");
Ok(DnsRecord::TLSA(TLSARecord {
cert_usage: tlsa_cert_usage_from_u8(usage)?,
selector: tlsa_selector_from_u8(selector)?,
matching: tlsa_matching_from_u8(matching)?,
cert_data: decode_hex(&hex)?,
}))
}
fn parse_caa(value: &str) -> crate::Result<DnsRecord> {
let mut parts = value.splitn(3, char::is_whitespace);
let flags: u8 = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid CAA value '{value}'")))?
.parse()
.map_err(|e| Error::Parse(format!("invalid CAA flags in '{value}': {e}")))?;
let tag = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid CAA value '{value}'")))?
.to_ascii_lowercase();
let raw_value = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid CAA value '{value}'")))?
.trim();
let unquoted = raw_value
.strip_prefix('"')
.and_then(|s| s.strip_suffix('"'))
.map(|s| s.replace("\\\"", "\""))
.unwrap_or_else(|| raw_value.to_string());
let issuer_critical = flags & 0x80 != 0;
match tag.as_str() {
"issue" => {
let (name, options) = parse_caa_kv(&unquoted);
Ok(DnsRecord::CAA(CAARecord::Issue {
issuer_critical,
name,
options,
}))
}
"issuewild" => {
let (name, options) = parse_caa_kv(&unquoted);
Ok(DnsRecord::CAA(CAARecord::IssueWild {
issuer_critical,
name,
options,
}))
}
"iodef" => Ok(DnsRecord::CAA(CAARecord::Iodef {
issuer_critical,
url: unquoted,
})),
other => Err(Error::Parse(format!("unknown CAA tag: {other}"))),
}
}
fn parse_caa_kv(value: &str) -> (Option<String>, Vec<KeyValue>) {
let mut parts = value.split(';').map(str::trim);
let name_part = parts.next().unwrap_or("").trim().to_string();
let name = if name_part.is_empty() {
None
} else {
Some(name_part)
};
let options = parts
.filter(|p| !p.is_empty())
.map(|p| match p.split_once('=') {
Some((k, v)) => KeyValue {
key: k.trim().to_string(),
value: v.trim().to_string(),
},
None => KeyValue {
key: p.trim().to_string(),
value: String::new(),
},
})
.collect();
(name, options)
}
fn strip_trailing_dot(value: &str) -> String {
value.strip_suffix('.').unwrap_or(value).to_string()
}
fn decode_hex(hex: &str) -> crate::Result<Vec<u8>> {
if !hex.len().is_multiple_of(2) {
return Err(Error::Parse(format!("invalid hex string: {hex}")));
}
(0..hex.len())
.step_by(2)
.map(|i| {
u8::from_str_radix(&hex[i..i + 2], 16)
.map_err(|e| Error::Parse(format!("invalid hex byte: {e}")))
})
.collect()
}
fn tlsa_cert_usage_from_u8(value: u8) -> crate::Result<TlsaCertUsage> {
Ok(match value {
0 => TlsaCertUsage::PkixTa,
1 => TlsaCertUsage::PkixEe,
2 => TlsaCertUsage::DaneTa,
3 => TlsaCertUsage::DaneEe,
255 => TlsaCertUsage::Private,
_ => return Err(Error::Parse(format!("unknown TLSA cert usage: {value}"))),
})
}
fn tlsa_selector_from_u8(value: u8) -> crate::Result<TlsaSelector> {
Ok(match value {
0 => TlsaSelector::Full,
1 => TlsaSelector::Spki,
255 => TlsaSelector::Private,
_ => return Err(Error::Parse(format!("unknown TLSA selector: {value}"))),
})
}
fn tlsa_matching_from_u8(value: u8) -> crate::Result<TlsaMatching> {
Ok(match value {
0 => TlsaMatching::Raw,
1 => TlsaMatching::Sha256,
2 => TlsaMatching::Sha512,
255 => TlsaMatching::Private,
_ => return Err(Error::Parse(format!("unknown TLSA matching: {value}"))),
})
}