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//! DNS Device Path
//!
//! This module implements the DNS device path node as defined in UEFI 2.11 specification
//! section 10.3.4.27. This device path describes DNS server configuration.
use core::net::{Ipv4Addr, Ipv6Addr};
use crate::parser::{ByteOrder, Parser};
use crate::{Error, Head};
use alloc::vec::Vec;
/// DNS Server Address Lists
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum Servers {
/// IPv4 server addresses
Ipv4(Vec<Ipv4Addr>),
/// IPv6 server addresses
Ipv6(Vec<Ipv6Addr>),
}
/// DNS Device Path (SubType 0x1F)
///
/// According to UEFI 2.11 spec section 10.3.4.29:
/// - Length: 5+n bytes (variable length due to DNS server addresses)
/// - IsIPv6: 1 byte (0x00 = IPv4, 0x01 = IPv6)
/// - DNS Server Addresses: variable length list of IP addresses
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct Dns {
/// DNS server addresses
pub servers: Servers,
}
impl<'a> TryFrom<Head<'a>> for Dns {
type Error = Error;
fn try_from(mut node: Head<'a>) -> Result<Self, Self::Error> {
Ok(Self {
servers: match node.data.parse(())? {
0u8 => {
let mut servers = Vec::new();
while !node.data.is_empty() {
servers.push(Ipv4Addr::from_bits(node.data.parse(ByteOrder::Big)?));
}
Servers::Ipv4(servers)
}
1u8 => {
let mut servers = Vec::new();
while !node.data.is_empty() {
servers.push(Ipv6Addr::from_bits(node.data.parse(ByteOrder::Big)?));
}
Servers::Ipv6(servers)
}
_ => return Err(Error::Invalid),
},
})
}
}