112 lines
3.2 KiB
Rust
112 lines
3.2 KiB
Rust
//! DNS client compatible with the `embedded-nal-async` traits.
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//!
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//! This exists only for compatibility with crates that use `embedded-nal-async`.
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//! Prefer using [`Stack::dns_query`](crate::Stack::dns_query) directly if you're
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//! not using `embedded-nal-async`.
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use heapless::Vec;
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pub use smoltcp::socket::dns::{DnsQuery, Socket};
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pub(crate) use smoltcp::socket::dns::{GetQueryResultError, StartQueryError};
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pub use smoltcp::wire::{DnsQueryType, IpAddress};
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use crate::{Driver, Stack};
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/// Errors returned by DnsSocket.
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#[derive(Debug, PartialEq, Eq, Clone, Copy)]
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#[cfg_attr(feature = "defmt", derive(defmt::Format))]
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pub enum Error {
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/// Invalid name
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InvalidName,
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/// Name too long
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NameTooLong,
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/// Name lookup failed
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Failed,
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}
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impl From<GetQueryResultError> for Error {
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fn from(_: GetQueryResultError) -> Self {
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Self::Failed
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}
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}
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impl From<StartQueryError> for Error {
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fn from(e: StartQueryError) -> Self {
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match e {
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StartQueryError::NoFreeSlot => Self::Failed,
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StartQueryError::InvalidName => Self::InvalidName,
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StartQueryError::NameTooLong => Self::NameTooLong,
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}
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}
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}
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/// DNS client compatible with the `embedded-nal-async` traits.
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///
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/// This exists only for compatibility with crates that use `embedded-nal-async`.
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/// Prefer using [`Stack::dns_query`](crate::Stack::dns_query) directly if you're
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/// not using `embedded-nal-async`.
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pub struct DnsSocket<'a, D>
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where
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D: Driver + 'static,
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{
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stack: &'a Stack<D>,
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}
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impl<'a, D> DnsSocket<'a, D>
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where
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D: Driver + 'static,
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{
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/// Create a new DNS socket using the provided stack.
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///
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/// NOTE: If using DHCP, make sure it has reconfigured the stack to ensure the DNS servers are updated.
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pub fn new(stack: &'a Stack<D>) -> Self {
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Self { stack }
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}
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/// Make a query for a given name and return the corresponding IP addresses.
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pub async fn query(
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&self,
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name: &str,
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qtype: DnsQueryType,
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) -> Result<Vec<IpAddress, { smoltcp::config::DNS_MAX_RESULT_COUNT }>, Error> {
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self.stack.dns_query(name, qtype).await
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}
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}
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impl<'a, D> embedded_nal_async::Dns for DnsSocket<'a, D>
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where
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D: Driver + 'static,
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{
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type Error = Error;
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async fn get_host_by_name(
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&self,
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host: &str,
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addr_type: embedded_nal_async::AddrType,
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) -> Result<embedded_nal_async::IpAddr, Self::Error> {
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use embedded_nal_async::{AddrType, IpAddr};
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let qtype = match addr_type {
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AddrType::IPv6 => DnsQueryType::Aaaa,
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_ => DnsQueryType::A,
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};
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let addrs = self.query(host, qtype).await?;
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if let Some(first) = addrs.get(0) {
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Ok(match first {
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#[cfg(feature = "proto-ipv4")]
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IpAddress::Ipv4(addr) => IpAddr::V4(addr.0.into()),
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#[cfg(feature = "proto-ipv6")]
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IpAddress::Ipv6(addr) => IpAddr::V6(addr.0.into()),
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})
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} else {
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Err(Error::Failed)
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}
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}
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async fn get_host_by_address(
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&self,
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_addr: embedded_nal_async::IpAddr,
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_result: &mut [u8],
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) -> Result<usize, Self::Error> {
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todo!()
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}
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}
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