use crate::{
CAARecord, DnsRecord, DnsRecordType, Error, IntoFqdn, KeyValue, MXRecord, SRVRecord,
TLSARecord, TlsaCertUsage, TlsaMatching, TlsaSelector,
http::{HttpClient, HttpClientBuilder},
utils::strip_origin_from_name,
};
use serde::{Deserialize, Serialize};
use std::{
borrow::Cow,
net::{Ipv4Addr, Ipv6Addr},
time::Duration,
};
const DEFAULT_API_ENDPOINT: &str = "https://api.dynu.com/v2";
const RETRY_ATTEMPTS: u32 = 3;
#[derive(Clone)]
pub struct DynuProvider {
client: HttpClient,
endpoint: Cow<'static, str>,
}
#[derive(Deserialize, Debug)]
struct RootDomain {
id: i64,
#[serde(rename = "domainName")]
domain_name: String,
#[serde(rename = "statusCode", default)]
status_code: u16,
}
#[derive(Deserialize, Debug)]
struct RecordsResponse {
#[serde(rename = "statusCode", default)]
status_code: u16,
#[serde(rename = "dnsRecords", default)]
dns_records: Vec<ListedRecord>,
}
#[derive(Deserialize, Debug, Clone)]
struct ListedRecord {
id: i64,
#[serde(rename = "recordType", default)]
record_type: String,
#[serde(default)]
hostname: String,
#[serde(rename = "ipv4Address", default)]
ipv4_address: Option<Ipv4Addr>,
#[serde(rename = "ipv6Address", default)]
ipv6_address: Option<Ipv6Addr>,
#[serde(default)]
host: Option<String>,
#[serde(rename = "textData", default)]
text_data: Option<String>,
#[serde(default)]
priority: Option<u16>,
#[serde(default)]
weight: Option<u16>,
#[serde(default)]
port: Option<u16>,
#[serde(default)]
flag: Option<u8>,
#[serde(default)]
tag: Option<String>,
#[serde(rename = "caaValue", default)]
caa_value: Option<String>,
#[serde(rename = "certificateUsage", default)]
certificate_usage: Option<u8>,
#[serde(default)]
selector: Option<u8>,
#[serde(rename = "matchingType", default)]
matching_type: Option<u8>,
#[serde(default)]
certificate: Option<String>,
}
#[derive(Serialize, Debug)]
struct CreateRecord<'a> {
#[serde(rename = "recordType")]
record_type: &'static str,
#[serde(rename = "domainName")]
domain_name: &'a str,
#[serde(rename = "nodeName")]
node_name: &'a str,
#[serde(rename = "hostname")]
hostname: &'a str,
state: bool,
ttl: u32,
#[serde(flatten)]
payload: Payload,
}
#[derive(Serialize, Debug, Clone, PartialEq, Eq)]
#[serde(untagged)]
enum Payload {
Txt {
#[serde(rename = "textData")]
text_data: String,
},
A {
#[serde(rename = "ipv4Address")]
ipv4_address: Ipv4Addr,
},
Aaaa {
#[serde(rename = "ipv6Address")]
ipv6_address: Ipv6Addr,
},
Cname {
host: String,
},
Ns {
host: String,
},
Mx {
host: String,
priority: u16,
},
Srv {
host: String,
priority: u16,
weight: u16,
port: u16,
},
Caa {
flag: u8,
tag: String,
#[serde(rename = "caaValue")]
caa_value: String,
},
Tlsa {
#[serde(rename = "certificateUsage")]
certificate_usage: u8,
selector: u8,
#[serde(rename = "matchingType")]
matching_type: u8,
certificate: String,
},
}
impl DynuProvider {
pub(crate) fn new(api_key: impl AsRef<str>, timeout: Option<Duration>) -> crate::Result<Self> {
let api_key = api_key.as_ref();
if api_key.is_empty() {
return Err(Error::Api("Dynu API key is empty".to_string()));
}
let client = HttpClientBuilder::default()
.with_header("API-Key", api_key)
.with_header("Accept", "application/json")
.with_timeout(timeout)
.build();
Ok(Self {
client,
endpoint: Cow::Borrowed(DEFAULT_API_ENDPOINT),
})
}
#[cfg(test)]
pub(crate) fn with_endpoint(self, endpoint: impl Into<Cow<'static, str>>) -> Self {
Self {
endpoint: endpoint.into(),
..self
}
}
pub(crate) async fn set_rrset(
&self,
name: impl IntoFqdn<'_>,
record_type: DnsRecordType,
ttl: u32,
records: Vec<DnsRecord>,
origin: impl IntoFqdn<'_>,
) -> crate::Result<()> {
let _ = origin;
let hostname = name.into_name().into_owned();
let desired = build_payloads(record_type, records)?;
let root = self.get_root_domain(&hostname).await?;
let node = strip_origin_from_name(&hostname, &root.domain_name, Some(""));
let existing = self.list_at(root.id, &hostname, record_type).await?;
let mut existing_pool: Vec<ListedRecord> = existing;
let mut to_add: Vec<Payload> = Vec::new();
for payload in desired {
if let Some(idx) = existing_pool
.iter()
.position(|r| matches_payload(r, &payload))
{
existing_pool.swap_remove(idx);
} else {
to_add.push(payload);
}
}
for entry in existing_pool {
self.delete_by_id(root.id, entry.id).await?;
}
let record_type_str = record_type.as_str();
for payload in to_add {
self.post_record(
root.id,
record_type_str,
&root.domain_name,
&node,
&hostname,
ttl,
payload,
)
.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<()> {
let _ = origin;
if records.is_empty() {
return Ok(());
}
let hostname = name.into_name().into_owned();
let desired = build_payloads(record_type, records)?;
let root = self.get_root_domain(&hostname).await?;
let node = strip_origin_from_name(&hostname, &root.domain_name, Some(""));
let existing = self.list_at(root.id, &hostname, record_type).await?;
let record_type_str = record_type.as_str();
for payload in desired {
if existing.iter().any(|r| matches_payload(r, &payload)) {
continue;
}
self.post_record(
root.id,
record_type_str,
&root.domain_name,
&node,
&hostname,
ttl,
payload,
)
.await?;
}
Ok(())
}
pub(crate) async fn remove_from_rrset(
&self,
name: impl IntoFqdn<'_>,
record_type: DnsRecordType,
records: Vec<DnsRecord>,
origin: impl IntoFqdn<'_>,
) -> crate::Result<()> {
let _ = origin;
if records.is_empty() {
return Ok(());
}
let hostname = name.into_name().into_owned();
let to_remove = build_payloads(record_type, records)?;
let root = self.get_root_domain(&hostname).await?;
let existing = self.list_at(root.id, &hostname, record_type).await?;
for payload in to_remove {
if let Some(entry) = existing.iter().find(|r| matches_payload(r, &payload)) {
self.delete_by_id(root.id, entry.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;
let hostname = name.into_name().into_owned();
let root = self.get_root_domain(&hostname).await?;
let listed = self.list_at(root.id, &hostname, record_type).await?;
listed
.into_iter()
.map(|r| listed_to_dns_record(r, record_type))
.collect()
}
#[allow(clippy::too_many_arguments)]
async fn post_record(
&self,
domain_id: i64,
record_type: &'static str,
domain_name: &str,
node_name: &str,
hostname: &str,
ttl: u32,
payload: Payload,
) -> crate::Result<()> {
let body = CreateRecord {
record_type,
domain_name,
node_name,
hostname,
state: true,
ttl,
payload,
};
self.client
.post(format!("{}/dns/{}/record", self.endpoint, domain_id))
.with_body(body)?
.send_with_retry::<serde_json::Value>(RETRY_ATTEMPTS)
.await
.map(|_| ())
}
async fn delete_by_id(&self, domain_id: i64, record_id: i64) -> crate::Result<()> {
self.client
.delete(format!(
"{}/dns/{}/record/{}",
self.endpoint, domain_id, record_id
))
.send_with_retry::<serde_json::Value>(RETRY_ATTEMPTS)
.await
.map(|_| ())
}
async fn get_root_domain(&self, hostname: &str) -> crate::Result<RootDomain> {
let response: RootDomain = self
.client
.get(format!("{}/dns/getroot/{}", self.endpoint, hostname))
.send_with_retry(RETRY_ATTEMPTS)
.await?;
if response.status_code != 0 && !(200..300).contains(&response.status_code) {
return Err(Error::Api(format!(
"Dynu getroot returned status {}",
response.status_code
)));
}
Ok(response)
}
async fn list_at(
&self,
domain_id: i64,
hostname: &str,
record_type: DnsRecordType,
) -> crate::Result<Vec<ListedRecord>> {
let response: RecordsResponse = self
.client
.get(format!(
"{}/dns/record/{}?recordType={}",
self.endpoint,
hostname,
record_type.as_str()
))
.send_with_retry(RETRY_ATTEMPTS)
.await?;
if response.status_code != 0 && !(200..300).contains(&response.status_code) {
return Err(Error::Api(format!(
"Dynu getrecords returned status {}",
response.status_code
)));
}
let _ = domain_id;
let target_type = record_type.as_str();
let target_host = hostname.trim_end_matches('.');
Ok(response
.dns_records
.into_iter()
.filter(|r| {
r.record_type.eq_ignore_ascii_case(target_type)
&& r.hostname
.trim_end_matches('.')
.eq_ignore_ascii_case(target_host)
})
.collect())
}
}
fn build_payloads(
expected_type: DnsRecordType,
records: Vec<DnsRecord>,
) -> crate::Result<Vec<Payload>> {
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(),
)));
}
let (_, payload) = record_type_and_payload(record)?;
out.push(payload);
}
Ok(out)
}
fn record_type_and_payload(record: DnsRecord) -> crate::Result<(&'static str, Payload)> {
match record {
DnsRecord::TXT(text_data) => Ok(("TXT", Payload::Txt { text_data })),
DnsRecord::A(ipv4_address) => Ok(("A", Payload::A { ipv4_address })),
DnsRecord::AAAA(ipv6_address) => Ok(("AAAA", Payload::Aaaa { ipv6_address })),
DnsRecord::CNAME(host) => Ok((
"CNAME",
Payload::Cname {
host: host.into_name().into_owned(),
},
)),
DnsRecord::NS(host) => Ok((
"NS",
Payload::Ns {
host: host.into_name().into_owned(),
},
)),
DnsRecord::MX(mx) => Ok((
"MX",
Payload::Mx {
host: mx.exchange.into_name().into_owned(),
priority: mx.priority,
},
)),
DnsRecord::SRV(srv) => Ok((
"SRV",
Payload::Srv {
host: srv.target.into_name().into_owned(),
priority: srv.priority,
weight: srv.weight,
port: srv.port,
},
)),
DnsRecord::CAA(caa) => {
let (flag, tag, caa_value) = caa.decompose();
Ok((
"CAA",
Payload::Caa {
flag,
tag,
caa_value,
},
))
}
DnsRecord::TLSA(tlsa) => Ok((
"TLSA",
Payload::Tlsa {
certificate_usage: u8::from(tlsa.cert_usage),
selector: u8::from(tlsa.selector),
matching_type: u8::from(tlsa.matching),
certificate: tlsa.cert_data.iter().map(|b| format!("{b:02x}")).collect(),
},
)),
}
}
fn matches_payload(listed: &ListedRecord, payload: &Payload) -> bool {
match payload {
Payload::Txt { text_data } => listed
.text_data
.as_deref()
.map(|s| s == text_data)
.unwrap_or(false),
Payload::A { ipv4_address } => listed.ipv4_address.as_ref() == Some(ipv4_address),
Payload::Aaaa { ipv6_address } => listed.ipv6_address.as_ref() == Some(ipv6_address),
Payload::Cname { host } | Payload::Ns { host } => listed
.host
.as_deref()
.map(|h| {
h.trim_end_matches('.')
.eq_ignore_ascii_case(host.trim_end_matches('.'))
})
.unwrap_or(false),
Payload::Mx { host, priority } => {
listed.priority == Some(*priority)
&& listed
.host
.as_deref()
.map(|h| {
h.trim_end_matches('.')
.eq_ignore_ascii_case(host.trim_end_matches('.'))
})
.unwrap_or(false)
}
Payload::Srv {
host,
priority,
weight,
port,
} => {
listed.priority == Some(*priority)
&& listed.weight == Some(*weight)
&& listed.port == Some(*port)
&& listed
.host
.as_deref()
.map(|h| {
h.trim_end_matches('.')
.eq_ignore_ascii_case(host.trim_end_matches('.'))
})
.unwrap_or(false)
}
Payload::Caa {
flag,
tag,
caa_value,
} => {
listed.flag == Some(*flag)
&& listed.tag.as_deref() == Some(tag.as_str())
&& listed.caa_value.as_deref() == Some(caa_value.as_str())
}
Payload::Tlsa {
certificate_usage,
selector,
matching_type,
certificate,
} => {
listed.certificate_usage == Some(*certificate_usage)
&& listed.selector == Some(*selector)
&& listed.matching_type == Some(*matching_type)
&& listed
.certificate
.as_deref()
.map(|c| c.eq_ignore_ascii_case(certificate))
.unwrap_or(false)
}
}
}
fn listed_to_dns_record(listed: ListedRecord, expected: DnsRecordType) -> crate::Result<DnsRecord> {
match expected {
DnsRecordType::A => listed
.ipv4_address
.map(DnsRecord::A)
.ok_or_else(|| Error::Parse("missing ipv4Address in Dynu A record".to_string())),
DnsRecordType::AAAA => listed
.ipv6_address
.map(DnsRecord::AAAA)
.ok_or_else(|| Error::Parse("missing ipv6Address in Dynu AAAA record".to_string())),
DnsRecordType::CNAME => listed
.host
.map(DnsRecord::CNAME)
.ok_or_else(|| Error::Parse("missing host in Dynu CNAME record".to_string())),
DnsRecordType::NS => listed
.host
.map(DnsRecord::NS)
.ok_or_else(|| Error::Parse("missing host in Dynu NS record".to_string())),
DnsRecordType::MX => {
let exchange = listed
.host
.ok_or_else(|| Error::Parse("missing host in Dynu MX record".to_string()))?;
let priority = listed
.priority
.ok_or_else(|| Error::Parse("missing priority in Dynu MX record".to_string()))?;
Ok(DnsRecord::MX(MXRecord { exchange, priority }))
}
DnsRecordType::TXT => listed
.text_data
.map(DnsRecord::TXT)
.ok_or_else(|| Error::Parse("missing textData in Dynu TXT record".to_string())),
DnsRecordType::SRV => {
let target = listed
.host
.ok_or_else(|| Error::Parse("missing host in Dynu SRV record".to_string()))?;
let priority = listed
.priority
.ok_or_else(|| Error::Parse("missing priority in Dynu SRV record".to_string()))?;
let weight = listed
.weight
.ok_or_else(|| Error::Parse("missing weight in Dynu SRV record".to_string()))?;
let port = listed
.port
.ok_or_else(|| Error::Parse("missing port in Dynu SRV record".to_string()))?;
Ok(DnsRecord::SRV(SRVRecord {
priority,
weight,
port,
target,
}))
}
DnsRecordType::CAA => {
let flag = listed
.flag
.ok_or_else(|| Error::Parse("missing flag in Dynu CAA record".to_string()))?;
let tag = listed
.tag
.ok_or_else(|| Error::Parse("missing tag in Dynu CAA record".to_string()))?;
let value = listed
.caa_value
.ok_or_else(|| Error::Parse("missing caaValue in Dynu CAA record".to_string()))?;
Ok(DnsRecord::CAA(build_caa(flag, tag, value)?))
}
DnsRecordType::TLSA => {
let usage = listed.certificate_usage.ok_or_else(|| {
Error::Parse("missing certificateUsage in Dynu TLSA record".to_string())
})?;
let selector = listed
.selector
.ok_or_else(|| Error::Parse("missing selector in Dynu TLSA record".to_string()))?;
let matching = listed.matching_type.ok_or_else(|| {
Error::Parse("missing matchingType in Dynu TLSA record".to_string())
})?;
let hex = listed.certificate.ok_or_else(|| {
Error::Parse("missing certificate in Dynu TLSA record".to_string())
})?;
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 build_caa(flags: u8, tag: String, value: String) -> crate::Result<CAARecord> {
let issuer_critical = flags & 0x80 != 0;
match tag.as_str() {
"issue" => {
let (name, options) = parse_caa_value(&value);
Ok(CAARecord::Issue {
issuer_critical,
name,
options,
})
}
"issuewild" => {
let (name, options) = parse_caa_value(&value);
Ok(CAARecord::IssueWild {
issuer_critical,
name,
options,
})
}
"iodef" => Ok(CAARecord::Iodef {
issuer_critical,
url: value,
}),
other => Err(Error::Parse(format!("unknown CAA tag: {other}"))),
}
}
fn parse_caa_value(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 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}"))),
})
}