mirror of
https://github.com/saymrwulf/xous-core.git
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82 lines
2.4 KiB
Rust
82 lines
2.4 KiB
Rust
#[allow(dead_code)]
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// note: this name cannot be changed, because it is baked into `libstd`
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pub(crate) const SERVER_NAME_DNS: &str = "_DNS Resolver Middleware_";
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use net::NetIpAddr;
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use rkyv::{Archive, Deserialize, Serialize};
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#[allow(dead_code)]
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pub(crate) const DNS_NAME_LENGTH_LIMIT: usize = 256;
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#[allow(dead_code)]
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pub(crate) const DNS_PKT_MAX_LEN: usize = 512;
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/// These opcodes can be called by anyone at any time
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#[derive(num_derive::FromPrimitive, num_derive::ToPrimitive, Debug)]
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#[repr(C)]
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pub(crate) enum Opcode {
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Lookup = 0,
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Flush = 1,
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/// used internally to update the TTL field, and eventually expire the cache (unless cache is frozen)
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UpdateTtl = 2,
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/// issuing this opcode causes all future attempts to change the DNS server configs to be ignored. This also freezes the cache.
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FreezeConfig = 3,
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/// this allows automatic updates to the DNS server configs based on DHCP. This is the default state.
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ThawConfig = 4,
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Quit = 5,
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/// Perform a DNS lookup and return the results in a raw format.
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///
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/// The query should be a `MutableBorrow` and should be a `&str` with the
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/// `valid` parameter set to the length of the query.
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///
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/// The result will be a `&[u8]` with the first field being `0` and the second
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/// field indicating the number of results.
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///
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/// # Errors
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///
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/// If there is an error, then the first field is `1` and the second field is
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/// an error code corresponding to `DnsResponseCode`
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///
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/// # Success
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///
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/// Upon successful return, a series of entries will begin at offset 2. Each
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/// entry is a tag, followed by a number of octets. The tag indicates
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/// how many octets follow:
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///
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/// * 4: Ipv4 Address -- 4 octets follow, for a total of 5 bytes
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/// * 6: Ipv6 Address -- 16 octets follow, for a total of 17 bytes
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RawLookup = 6,
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}
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#[derive(
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Debug,
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num_derive::FromPrimitive,
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num_derive::ToPrimitive,
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Archive,
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Serialize,
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Deserialize,
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Copy,
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Clone,
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)]
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#[repr(u16)]
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pub enum DnsResponseCode {
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NoError = 0,
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FormatError = 1,
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ServerFailure = 2,
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NameError = 3,
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NotImplemented = 4,
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Refused = 5,
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UnknownError = 6,
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NetworkError = 7,
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NoServerSpecified = 8,
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}
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#[derive(Debug, Archive, Serialize, Deserialize, Copy, Clone)]
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pub struct DnsResponse {
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pub addr: Option<NetIpAddr>,
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pub code: DnsResponseCode,
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}
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