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use std::{
net::ToSocketAddrs,
task::{Context, Poll},
vec::IntoIter,
};
use hyper::{client::connect::dns::Name, service::Service};
use ipnet::IpNet;
use trust_dns_resolver::{
config::{ResolverConfig, ResolverOpts},
TokioAsyncResolver,
};
#[allow(unused_imports)]
use crate::internal_prelude::*;
pub trait Resolver: Clone + Send + Sync + 'static {
fn new_default() -> Result<Self, io::Error>;
fn resolve(&self, host: &str) -> PinnedFut<Result<IntoIter<SocketAddr>, io::Error>>;
fn with_net_blacklist(self, blacklist: Arc<Vec<IpNet>>) -> Self;
}
#[derive(Clone, Debug)]
pub struct AsyncHyperResolver {
resolver: Arc<TokioAsyncResolver>,
net_blacklist: Arc<Vec<IpNet>>,
}
impl AsyncHyperResolver {
pub fn new(config: ResolverConfig, options: ResolverOpts) -> Result<Self, io::Error> {
let resolver = Arc::new(TokioAsyncResolver::tokio(config, options)?);
Ok(Self { resolver, net_blacklist: Arc::new(vec![]) })
}
}
impl Resolver for AsyncHyperResolver {
fn new_default() -> Result<Self, io::Error> {
let resolver = Arc::new(TokioAsyncResolver::tokio_from_system_conf()?);
Ok(Self { resolver, net_blacklist: Arc::new(vec![]) })
}
fn with_net_blacklist(mut self, blacklist: Arc<Vec<IpNet>>) -> Self {
self.net_blacklist = blacklist;
self
}
fn resolve(&self, name: &str) -> PinnedFut<Result<IntoIter<SocketAddr>, io::Error>> {
let resolver = self.clone();
let s_name = String::from(name);
Box::pin(async move {
let r = resolver
.resolver
.lookup_ip(s_name.as_str())
.await?
.iter()
.map(|addr| (addr, 0_u16).to_socket_addrs())
.try_fold(Vec::new(), |mut acc, s_addr| {
acc.extend(s_addr?);
Ok::<_, io::Error>(acc)
})?
.into_iter();
let mut out_addrs: Vec<SocketAddr> = vec![];
for addr in r.into_iter() {
for blacklisted_net in resolver.net_blacklist.iter() {
if blacklisted_net.contains(&addr.ip()) {
return Err(io::Error::new(
io::ErrorKind::Interrupted,
format!("resolved IP {} is blacklisted", addr.ip().to_string().as_str()),
))
}
}
out_addrs.push(addr);
}
Ok(out_addrs.into_iter())
})
}
}
#[derive(Debug, Clone)]
pub(crate) struct Adaptor<R> {
resolver: Arc<R>,
}
impl<R: Resolver> Adaptor<R> {
pub fn new(resolver: Arc<R>) -> Self {
Self { resolver }
}
}
impl<R: Resolver> Service<Name> for Adaptor<R> {
type Error = io::Error;
type Future = PinnedFut<Result<Self::Response, Self::Error>>;
type Response = std::vec::IntoIter<SocketAddr>;
fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
fn call(&mut self, name: Name) -> Self::Future {
let adaptor = self.clone();
Box::pin(async move { adaptor.resolver.resolve(name.as_str()).await })
}
}
lazy_static! {
pub static ref RESERVED_SUBNETS: Arc<Vec<IpNet>> = Arc::new({
vec![
"0.0.0.0/8",
"10.0.0.0/8",
"100.64.0.0/10",
"127.0.0.0/8",
"169.254.0.0/16",
"172.16.0.0/12",
"192.0.0.0/24",
"192.0.2.0/24",
"192.88.99.0/24",
"192.168.0.0/16",
"198.18.0.0/15",
"198.51.100.0/24",
"203.0.113.0/24",
"224.0.0.0/4",
"233.252.0.0/24",
"240.0.0.0/4",
"255.255.255.255/32",
"::1/128",
"::/128",
"::ffff:0:0/96",
"64:ff9b::/96",
"64:ff9b:1::/48",
"100::/64",
"2001::/23",
"2001::/32",
"2001:1::1/128",
"2001:1::2/128",
"2001:2::/48",
"2001:3::/32",
"2001:4:112::/48",
"2001:10::/28",
"2001:20::/28",
"2001:db8::/32",
"2002::/16",
"2620:4f:8000::/48",
"fc00::/7",
"fe80::/10",
].iter().map(|net|net.parse().unwrap()).collect()
});
}