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//! Resolve valid proxy configurations via DoH.
//!
use crate::config;
use core::fmt;
use hickory_resolver::{TokioAsyncResolver, config::*, error::ResolveError};
use rustls::ClientConfig;
use std::{net::IpAddr, sync::Arc, time::Duration};
use tokio::time::error::Elapsed;
/// The port to connect to the DoH resolvers over.
const RESOLVER_PORT: u16 = 443;
const DEFAULT_TIMEOUT: Duration = std::time::Duration::from_secs(10);
pub struct Nameserver {
pub name: String,
pub addr: Vec<IpAddr>,
}
#[derive(Debug)]
pub enum Error {
ResolutionError(ResolveError),
Timeout(Elapsed),
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Error::ResolutionError(err) => err.fmt(f),
Error::Timeout(err) => err.fmt(f),
}
}
}
impl std::error::Error for Error {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
match self {
Self::ResolutionError(err) => err.source(),
Self::Timeout(err) => err.source(),
}
}
}
/// Returns a set of well known public DoH resolvers. A sane default in many cases.
pub fn default_resolvers() -> Vec<Nameserver> {
vec![
Nameserver {
name: "one.one.one.one".to_owned(),
addr: vec!["1.1.1.1".parse().unwrap(), "1.0.0.1".parse().unwrap()],
},
Nameserver {
name: "dns.quad9.net".to_owned(),
addr: vec![
"9.9.9.9".parse().unwrap(),
"149.112.112.112".parse().unwrap(),
],
},
]
}
/// Calls [resolve_configs] with a given `domain` using known DoH resolvers provided by [default_resolvers]
pub async fn resolve_default_config(domain: &str) -> Result<Vec<config::ProxyConfig>, Error> {
resolve_configs(&default_resolvers(), domain).await
}
/// Looks up the `domain` towards the given `resolvers`, and try to deserialize all the returned
/// AAAA records into [`ProxyConfig`](config::ProxyConfig)s.
pub async fn resolve_configs(
resolvers: &[Nameserver],
domain: &str,
) -> Result<Vec<config::ProxyConfig>, Error> {
let mut nameservers = ResolverConfig::new();
for resolver in resolvers.iter() {
let ns_config_group = NameServerConfigGroup::from_ips_https(
&resolver.addr,
RESOLVER_PORT,
resolver.name.clone(),
false,
)
.into_inner();
for ns_config in ns_config_group {
nameservers.add_name_server(ns_config);
}
}
nameservers.set_tls_client_config(Arc::new(client_config_tls12()));
let mut resolver_config: ResolverOpts = Default::default();
resolver_config.timeout = Duration::from_secs(5);
resolve_config_with_resolverconfig(nameservers, resolver_config, domain, DEFAULT_TIMEOUT).await
}
pub async fn resolve_config_with_resolverconfig(
resolver_config: ResolverConfig,
options: ResolverOpts,
domain: &str,
timeout: Duration,
) -> Result<Vec<config::ProxyConfig>, Error> {
let resolver = TokioAsyncResolver::tokio(resolver_config, options);
let lookup = tokio::time::timeout(timeout, resolver.ipv6_lookup(domain))
.await
.map_err(Error::Timeout)?
.map_err(Error::ResolutionError)?;
let addrs = lookup.into_iter().map(|aaaa_record| aaaa_record.0);
let mut proxy_configs = Vec::new();
for addr in addrs {
match config::ProxyConfig::try_from(addr) {
Ok(proxy_config) => {
log::trace!("IPv6 {addr} parsed into proxy config: {proxy_config:?}");
proxy_configs.push(proxy_config);
}
Err(e) => log::error!("IPv6 {addr} fails to parse to a proxy config: {e}"),
}
}
Ok(proxy_configs)
}
fn client_config_tls12() -> ClientConfig {
use rustls::RootCertStore;
let mut root_store = RootCertStore::empty();
root_store.add_trust_anchors(webpki_roots::TLS_SERVER_ROOTS.iter().map(|ta| {
rustls::OwnedTrustAnchor::from_subject_spki_name_constraints(
ta.subject,
ta.spki,
ta.name_constraints,
)
}));
ClientConfig::builder()
.with_safe_default_cipher_suites()
.with_safe_default_kx_groups()
.with_safe_default_protocol_versions() // this enables TLS 1.2 and 1.3
.unwrap()
.with_root_certificates(root_store)
.with_no_client_auth()
}
#[cfg(test)]
#[tokio::test]
async fn test_resolution() {
let nameservers = vec![Nameserver {
addr: vec!["1.1.1.1".parse().unwrap()],
name: "one.one.one.one".to_owned(),
}];
let _ = resolve_configs(&nameservers, "frakta.eu").await.unwrap();
}
#[cfg(test)]
#[test]
fn default_resolvers_dont_panic() {
let _ = default_resolvers();
}
|
