128 lines
3.9 KiB
Rust
128 lines
3.9 KiB
Rust
use std::{
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collections::HashMap,
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future, iter,
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net::{IpAddr, SocketAddr},
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sync::{Arc, RwLock as StdRwLock},
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time::Duration,
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};
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use hickory_resolver::TokioAsyncResolver;
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use reqwest::dns::{Addrs, Name, Resolve, Resolving};
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use ruma::OwnedServerName;
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use tokio::sync::RwLock;
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use tracing::error;
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use crate::{service::sending::FedDest, Config, Error};
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pub(crate) type WellKnownMap = HashMap<OwnedServerName, (FedDest, String)>;
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type TlsNameMap = HashMap<String, (Vec<IpAddr>, u16)>;
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pub(crate) struct Resolver {
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pub(crate) destinations: Arc<RwLock<WellKnownMap>>, // actual_destination, host
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pub(crate) overrides: Arc<StdRwLock<TlsNameMap>>,
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pub(crate) resolver: Arc<TokioAsyncResolver>,
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pub(crate) hooked: Arc<Hooked>,
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}
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pub(crate) struct Hooked {
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pub(crate) overrides: Arc<StdRwLock<TlsNameMap>>,
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pub(crate) resolver: Arc<TokioAsyncResolver>,
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}
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impl Resolver {
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pub(crate) fn new(config: &Config) -> Self {
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let (sys_conf, mut opts) = hickory_resolver::system_conf::read_system_conf()
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.map_err(|e| {
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error!("Failed to set up hickory dns resolver with system config: {}", e);
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Error::bad_config("Failed to set up hickory dns resolver with system config.")
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})
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.unwrap();
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let mut conf = hickory_resolver::config::ResolverConfig::new();
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if let Some(domain) = sys_conf.domain() {
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conf.set_domain(domain.clone());
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}
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for sys_conf in sys_conf.search() {
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conf.add_search(sys_conf.clone());
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}
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for sys_conf in sys_conf.name_servers() {
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let mut ns = sys_conf.clone();
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ns.trust_negative_responses = !config.query_all_nameservers;
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conf.add_name_server(ns);
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}
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opts.cache_size = config.dns_cache_entries as usize;
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opts.negative_min_ttl = Some(Duration::from_secs(config.dns_min_ttl_nxdomain));
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opts.negative_max_ttl = Some(Duration::from_secs(60 * 60 * 24 * 30));
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opts.positive_min_ttl = Some(Duration::from_secs(config.dns_min_ttl));
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opts.positive_max_ttl = Some(Duration::from_secs(60 * 60 * 24 * 7));
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opts.timeout = Duration::from_secs(config.dns_timeout);
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opts.attempts = config.dns_attempts as usize;
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opts.try_tcp_on_error = config.dns_tcp_fallback;
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opts.num_concurrent_reqs = 1;
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opts.shuffle_dns_servers = true;
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opts.rotate = true;
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opts.ip_strategy = match config.ip_lookup_strategy {
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1 => hickory_resolver::config::LookupIpStrategy::Ipv4Only,
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2 => hickory_resolver::config::LookupIpStrategy::Ipv6Only,
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3 => hickory_resolver::config::LookupIpStrategy::Ipv4AndIpv6,
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4 => hickory_resolver::config::LookupIpStrategy::Ipv6thenIpv4,
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_ => hickory_resolver::config::LookupIpStrategy::Ipv4thenIpv6,
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};
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let resolver = Arc::new(TokioAsyncResolver::tokio(conf, opts));
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let overrides = Arc::new(StdRwLock::new(TlsNameMap::new()));
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Resolver {
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destinations: Arc::new(RwLock::new(WellKnownMap::new())),
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overrides: overrides.clone(),
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resolver: resolver.clone(),
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hooked: Arc::new(Hooked {
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overrides,
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resolver,
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}),
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}
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}
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}
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impl Resolve for Resolver {
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fn resolve(&self, name: Name) -> Resolving { resolve_to_reqwest(self.resolver.clone(), name) }
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}
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impl Resolve for Hooked {
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fn resolve(&self, name: Name) -> Resolving {
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let addr_port = self.overrides.read().unwrap().get(name.as_str()).cloned();
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if let Some((addr, port)) = addr_port {
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cached_to_reqwest(&addr, port)
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} else {
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resolve_to_reqwest(self.resolver.clone(), name)
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}
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}
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}
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fn cached_to_reqwest(override_name: &[IpAddr], port: u16) -> Resolving {
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override_name
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.first()
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.map(|first_name| -> Resolving {
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let saddr = SocketAddr::new(*first_name, port);
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let result: Box<dyn Iterator<Item = SocketAddr> + Send> = Box::new(iter::once(saddr));
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Box::pin(future::ready(Ok(result)))
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})
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.unwrap()
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}
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fn resolve_to_reqwest(resolver: Arc<TokioAsyncResolver>, name: Name) -> Resolving {
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Box::pin(async move {
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let results = resolver
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.lookup_ip(name.as_str())
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.await?
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.into_iter()
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.map(|ip| SocketAddr::new(ip, 0));
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Ok(Box::new(results) as Addrs)
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})
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}
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