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Code Issues Releases Activity

Improved HTTP client (#4740)

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* Improved HTTP client

* Change config compat to use auto, rename blacklist

* Fix wrong doc references
This commit is contained in:
Daniel García 2024-07-12 22:33:11 +02:00 committed by GitHub
parent a4ab014ade
commit 035f694d2f
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GPG Key ID: B5690EEEBB952194
12 changed files with 326 additions and 217 deletions
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10
.env.template
View File

@ -320,15 +320,15 @@
## The default is 10 seconds, but this could be to low on slower network connections
# ICON_DOWNLOAD_TIMEOUT=10
## Icon blacklist Regex
## Any domains or IPs that match this regex won't be fetched by the icon service.
## Block HTTP domains/IPs by Regex
## Any domains or IPs that match this regex won't be fetched by the internal HTTP client.
## Useful to hide other servers in the local network. Check the WIKI for more details
## NOTE: Always enclose this regex withing single quotes!
# ICON_BLACKLIST_REGEX='^(192\.168\.0\.[0-9]+|192\.168\.1\.[0-9]+)$'
# HTTP_REQUEST_BLOCK_REGEX='^(192\.168\.0\.[0-9]+|192\.168\.1\.[0-9]+)$'
## Any IP which is not defined as a global IP will be blacklisted.
## Enabling this will cause the internal HTTP client to refuse to connect to any non global IP address.
## Useful to secure your internal environment: See https://en.wikipedia.org/wiki/Reserved_IP_addresses for a list of IPs which it will block
# ICON_BLACKLIST_NON_GLOBAL_IPS=true
# HTTP_REQUEST_BLOCK_NON_GLOBAL_IPS=true
## Client Settings
## Enable experimental feature flags for clients.

17
src/api/admin.rs
View File

@ -1,4 +1,5 @@
use once_cell::sync::Lazy;
use reqwest::Method;
use serde::de::DeserializeOwned;
use serde_json::Value;
use std::env;
@ -21,10 +22,10 @@ use crate::{
config::ConfigBuilder,
db::{backup_database, get_sql_server_version, models::*, DbConn, DbConnType},
error::{Error, MapResult},
http_client::make_http_request,
mail,
util::{
container_base_image, format_naive_datetime_local, get_display_size, get_reqwest_client,
is_running_in_container, NumberOrString,
container_base_image, format_naive_datetime_local, get_display_size, is_running_in_container, NumberOrString,
},
CONFIG, VERSION,
};
@ -594,15 +595,15 @@ struct TimeApi {
}
async fn get_json_api<T: DeserializeOwned>(url: &str) -> Result<T, Error> {
let json_api = get_reqwest_client();
Ok(json_api.get(url).send().await?.error_for_status()?.json::<T>().await?)
Ok(make_http_request(Method::GET, url)?.send().await?.error_for_status()?.json::<T>().await?)
}
async fn has_http_access() -> bool {
let http_access = get_reqwest_client();
match http_access.head("https://github.com/dani-garcia/vaultwarden").send().await {
let req = match make_http_request(Method::HEAD, "https://github.com/dani-garcia/vaultwarden") {
Ok(r) => r,
Err(_) => return false,
};
match req.send().await {
Ok(r) => r.status().is_success(),
_ => false,
}

8
src/api/core/mod.rs
View File

@ -12,6 +12,7 @@ pub use accounts::purge_auth_requests;
pub use ciphers::{purge_trashed_ciphers, CipherData, CipherSyncData, CipherSyncType};
pub use emergency_access::{emergency_notification_reminder_job, emergency_request_timeout_job};
pub use events::{event_cleanup_job, log_event, log_user_event};
use reqwest::Method;
pub use sends::purge_sends;
pub fn routes() -> Vec<Route> {
@ -53,7 +54,8 @@ use crate::{
auth::Headers,
db::DbConn,
error::Error,
util::{get_reqwest_client, parse_experimental_client_feature_flags},
http_client::make_http_request,
util::parse_experimental_client_feature_flags,
};
#[derive(Debug, Serialize, Deserialize)]
@ -139,9 +141,7 @@ async fn hibp_breach(username: &str) -> JsonResult {
);
if let Some(api_key) = crate::CONFIG.hibp_api_key() {
let hibp_client = get_reqwest_client();
let res = hibp_client.get(&url).header("hibp-api-key", api_key).send().await?;
let res = make_http_request(Method::GET, &url)?.header("hibp-api-key", api_key).send().await?;
// If we get a 404, return a 404, it means no breached accounts
if res.status() == 404 {

7
src/api/core/two_factor/duo.rs
View File

@ -15,7 +15,7 @@ use crate::{
DbConn,
},
error::MapResult,
util::get_reqwest_client,
http_client::make_http_request,
CONFIG,
};
@ -210,10 +210,7 @@ async fn duo_api_request(method: &str, path: &str, params: &str, data: &DuoData)
let m = Method::from_str(method).unwrap_or_default();
let client = get_reqwest_client();
client
.request(m, &url)
make_http_request(m, &url)?
.basic_auth(username, Some(password))
.header(header::USER_AGENT, "vaultwarden:Duo/1.0 (Rust)")
.header(header::DATE, date)

48
src/api/icons.rs
View File

@ -1,6 +1,6 @@
use std::{
net::IpAddr,
sync::{Arc, Mutex},
sync::Arc,
time::{Duration, SystemTime},
};
@ -22,7 +22,8 @@ use html5gum::{Emitter, HtmlString, InfallibleTokenizer, Readable, StringReader,
use crate::{
error::Error,
util::{get_reqwest_client_builder, Cached, CustomDnsResolver, CustomResolverError},
http_client::{get_reqwest_client_builder, should_block_address, CustomHttpClientError},
util::Cached,
CONFIG,
};
@ -53,7 +54,6 @@ static CLIENT: Lazy<Client> = Lazy::new(|| {
.timeout(icon_download_timeout)
.pool_max_idle_per_host(5) // Configure the Hyper Pool to only have max 5 idle connections
.pool_idle_timeout(pool_idle_timeout) // Configure the Hyper Pool to timeout after 10 seconds
.dns_resolver(CustomDnsResolver::instance())
.default_headers(default_headers.clone())
.build()
.expect("Failed to build client")
@ -69,7 +69,8 @@ fn icon_external(domain: &str) -> Option<Redirect> {
return None;
}
if is_domain_blacklisted(domain) {
if should_block_address(domain) {
warn!("Blocked address: {}", domain);
return None;
}
@ -99,6 +100,15 @@ async fn icon_internal(domain: &str) -> Cached<(ContentType, Vec<u8>)> {
);
}
if should_block_address(domain) {
warn!("Blocked address: {}", domain);
return Cached::ttl(
(ContentType::new("image", "png"), FALLBACK_ICON.to_vec()),
CONFIG.icon_cache_negttl(),
true,
);
}
match get_icon(domain).await {
Some((icon, icon_type)) => {
Cached::ttl((ContentType::new("image", icon_type), icon), CONFIG.icon_cache_ttl(), true)
@ -144,30 +154,6 @@ fn is_valid_domain(domain: &str) -> bool {
true
}
pub fn is_domain_blacklisted(domain: &str) -> bool {
let Some(config_blacklist) = CONFIG.icon_blacklist_regex() else {
return false;
};
// Compiled domain blacklist
static COMPILED_BLACKLIST: Mutex<Option<(String, Regex)>> = Mutex::new(None);
let mut guard = COMPILED_BLACKLIST.lock().unwrap();
// If the stored regex is up to date, use it
if let Some((value, regex)) = &*guard {
if value == &config_blacklist {
return regex.is_match(domain);
}
}
// If we don't have a regex stored, or it's not up to date, recreate it
let regex = Regex::new(&config_blacklist).unwrap();
let is_match = regex.is_match(domain);
*guard = Some((config_blacklist, regex));
is_match
}
async fn get_icon(domain: &str) -> Option<(Vec<u8>, String)> {
let path = format!("{}/{}.png", CONFIG.icon_cache_folder(), domain);
@ -195,9 +181,9 @@ async fn get_icon(domain: &str) -> Option<(Vec<u8>, String)> {
Some((icon.to_vec(), icon_type.unwrap_or("x-icon").to_string()))
}
Err(e) => {
// If this error comes from the custom resolver, this means this is a blacklisted domain
// If this error comes from the custom resolver, this means this is a blocked domain
// or non global IP, don't save the miss file in this case to avoid leaking it
if let Some(error) = CustomResolverError::downcast_ref(&e) {
if let Some(error) = CustomHttpClientError::downcast_ref(&e) {
warn!("{error}");
return None;
}
@ -353,7 +339,7 @@ async fn get_icon_url(domain: &str) -> Result<IconUrlResult, Error> {
// First check the domain as given during the request for HTTPS.
let resp = match get_page(&ssldomain).await {
Err(e) if CustomResolverError::downcast_ref(&e).is_none() => {
Err(e) if CustomHttpClientError::downcast_ref(&e).is_none() => {
// If we get an error that is not caused by the blacklist, we retry with HTTP
match get_page(&httpdomain).await {
mut sub_resp @ Err(_) => {

2
src/api/mod.rs
View File

@ -20,7 +20,7 @@ pub use crate::api::{
core::two_factor::send_incomplete_2fa_notifications,
core::{emergency_notification_reminder_job, emergency_request_timeout_job},
core::{event_cleanup_job, events_routes as core_events_routes},
icons::{is_domain_blacklisted, routes as icons_routes},
icons::routes as icons_routes,
identity::routes as identity_routes,
notifications::routes as notifications_routes,
notifications::{AnonymousNotify, Notify, UpdateType, WS_ANONYMOUS_SUBSCRIPTIONS, WS_USERS},

27
src/api/push.rs
View File

@ -1,11 +1,14 @@
use reqwest::header::{ACCEPT, AUTHORIZATION, CONTENT_TYPE};
use reqwest::{
header::{ACCEPT, AUTHORIZATION, CONTENT_TYPE},
Method,
};
use serde_json::Value;
use tokio::sync::RwLock;
use crate::{
api::{ApiResult, EmptyResult, UpdateType},
db::models::{Cipher, Device, Folder, Send, User},
util::get_reqwest_client,
http_client::make_http_request,
CONFIG,
};
@ -50,8 +53,7 @@ async fn get_auth_push_token() -> ApiResult<String> {
("client_secret", &client_secret),
];
let res = match get_reqwest_client()
.post(&format!("{}/connect/token", CONFIG.push_identity_uri()))
let res = match make_http_request(Method::POST, &format!("{}/connect/token", CONFIG.push_identity_uri()))?
.form(&params)
.send()
.await
@ -104,8 +106,7 @@ pub async fn register_push_device(device: &mut Device, conn: &mut crate::db::DbC
let auth_push_token = get_auth_push_token().await?;
let auth_header = format!("Bearer {}", &auth_push_token);
if let Err(e) = get_reqwest_client()
.post(CONFIG.push_relay_uri() + "/push/register")
if let Err(e) = make_http_request(Method::POST, &(CONFIG.push_relay_uri() + "/push/register"))?
.header(CONTENT_TYPE, "application/json")
.header(ACCEPT, "application/json")
.header(AUTHORIZATION, auth_header)
@ -132,8 +133,7 @@ pub async fn unregister_push_device(push_uuid: Option<String>) -> EmptyResult {
let auth_header = format!("Bearer {}", &auth_push_token);
match get_reqwest_client()
.delete(CONFIG.push_relay_uri() + "/push/" + &push_uuid.unwrap())
match make_http_request(Method::DELETE, &(CONFIG.push_relay_uri() + "/push/" + &push_uuid.unwrap()))?
.header(AUTHORIZATION, auth_header)
.send()
.await
@ -266,8 +266,15 @@ async fn send_to_push_relay(notification_data: Value) {
let auth_header = format!("Bearer {}", &auth_push_token);
if let Err(e) = get_reqwest_client()
.post(CONFIG.push_relay_uri() + "/push/send")
let req = match make_http_request(Method::POST, &(CONFIG.push_relay_uri() + "/push/send")) {
Ok(r) => r,
Err(e) => {
error!("An error occurred while sending a send update to the push relay: {}", e);
return;
}
};
if let Err(e) = req
.header(ACCEPT, "application/json")
.header(CONTENT_TYPE, "application/json")
.header(AUTHORIZATION, &auth_header)

26
src/config.rs
View File

@ -146,6 +146,12 @@ macro_rules! make_config {
config.signups_domains_whitelist = config.signups_domains_whitelist.trim().to_lowercase();
config.org_creation_users = config.org_creation_users.trim().to_lowercase();
// Copy the values from the deprecated flags to the new ones
if config.http_request_block_regex.is_none() {
config.http_request_block_regex = config.icon_blacklist_regex.clone();
}
config
}
}
@ -531,12 +537,18 @@ make_config! {
icon_cache_negttl: u64, true, def, 259_200;
/// Icon download timeout |> Number of seconds when to stop attempting to download an icon.
icon_download_timeout: u64, true, def, 10;
/// Icon blacklist Regex |> Any domains or IPs that match this regex won't be fetched by the icon service.
/// [Deprecated] Icon blacklist Regex |> Use `http_request_block_regex` instead
icon_blacklist_regex: String, false, option;
/// [Deprecated] Icon blacklist non global IPs |> Use `http_request_block_non_global_ips` instead
icon_blacklist_non_global_ips: bool, false, def, true;
/// Block HTTP domains/IPs by Regex |> Any domains or IPs that match this regex won't be fetched by the internal HTTP client.
/// Useful to hide other servers in the local network. Check the WIKI for more details
icon_blacklist_regex: String, true, option;
/// Icon blacklist non global IPs |> Any IP which is not defined as a global IP will be blacklisted.
http_request_block_regex: String, true, option;
/// Block non global IPs |> Enabling this will cause the internal HTTP client to refuse to connect to any non global IP address.
/// Useful to secure your internal environment: See https://en.wikipedia.org/wiki/Reserved_IP_addresses for a list of IPs which it will block
icon_blacklist_non_global_ips: bool, true, def, true;
http_request_block_non_global_ips: bool, true, auto, |c| c.icon_blacklist_non_global_ips;
/// Disable Two-Factor remember |> Enabling this would force the users to use a second factor to login every time.
/// Note that the checkbox would still be present, but ignored.
@ -899,12 +911,12 @@ fn validate_config(cfg: &ConfigItems) -> Result<(), Error> {
err!("To use email 2FA as automatic fallback, email 2fa has to be enabled!");
}
// Check if the icon blacklist regex is valid
if let Some(ref r) = cfg.icon_blacklist_regex {
// Check if the HTTP request block regex is valid
if let Some(ref r) = cfg.http_request_block_regex {
let validate_regex = regex::Regex::new(r);
match validate_regex {
Ok(_) => (),
Err(e) => err!(format!("`ICON_BLACKLIST_REGEX` is invalid: {e:#?}")),
Err(e) => err!(format!("`HTTP_REQUEST_BLOCK_REGEX` is invalid: {e:#?}")),
}
}

5
src/error.rs
View File

@ -2,6 +2,7 @@
// Error generator macro
//
use crate::db::models::EventType;
use crate::http_client::CustomHttpClientError;
use std::error::Error as StdError;
macro_rules! make_error {
@ -68,6 +69,10 @@ make_error! {
Empty(Empty): _no_source, _serialize,
// Used to represent err! calls
Simple(String): _no_source, _api_error,
// Used in our custom http client to handle non-global IPs and blocked domains
CustomHttpClient(CustomHttpClientError): _has_source, _api_error,
// Used for special return values, like 2FA errors
Json(Value): _no_source, _serialize,
Db(DieselErr): _has_source, _api_error,

246
src/http_client.rs Normal file
View File

@ -0,0 +1,246 @@
use std::{
fmt,
net::{IpAddr, SocketAddr},
str::FromStr,
sync::{Arc, Mutex},
time::Duration,
};
use hickory_resolver::{system_conf::read_system_conf, TokioAsyncResolver};
use once_cell::sync::Lazy;
use regex::Regex;
use reqwest::{
dns::{Name, Resolve, Resolving},
header, Client, ClientBuilder,
};
use url::Host;
use crate::{util::is_global, CONFIG};
pub fn make_http_request(method: reqwest::Method, url: &str) -> Result<reqwest::RequestBuilder, crate::Error> {
let Ok(url) = url::Url::parse(url) else {
err!("Invalid URL");
};
let Some(host) = url.host() else {
err!("Invalid host");
};
should_block_host(host)?;
static INSTANCE: Lazy<Client> = Lazy::new(|| get_reqwest_client_builder().build().expect("Failed to build client"));
Ok(INSTANCE.request(method, url))
}
pub fn get_reqwest_client_builder() -> ClientBuilder {
let mut headers = header::HeaderMap::new();
headers.insert(header::USER_AGENT, header::HeaderValue::from_static("Vaultwarden"));
let redirect_policy = reqwest::redirect::Policy::custom(|attempt| {
if attempt.previous().len() >= 5 {
return attempt.error("Too many redirects");
}
let Some(host) = attempt.url().host() else {
return attempt.error("Invalid host");
};
if let Err(e) = should_block_host(host) {
return attempt.error(e);
}
attempt.follow()
});
Client::builder()
.default_headers(headers)
.redirect(redirect_policy)
.dns_resolver(CustomDnsResolver::instance())
.timeout(Duration::from_secs(10))
}
pub fn should_block_address(domain_or_ip: &str) -> bool {
if let Ok(ip) = IpAddr::from_str(domain_or_ip) {
if should_block_ip(ip) {
return true;
}
}
should_block_address_regex(domain_or_ip)
}
fn should_block_ip(ip: IpAddr) -> bool {
if !CONFIG.http_request_block_non_global_ips() {
return false;
}
!is_global(ip)
}
fn should_block_address_regex(domain_or_ip: &str) -> bool {
let Some(block_regex) = CONFIG.http_request_block_regex() else {
return false;
};
static COMPILED_REGEX: Mutex<Option<(String, Regex)>> = Mutex::new(None);
let mut guard = COMPILED_REGEX.lock().unwrap();
// If the stored regex is up to date, use it
if let Some((value, regex)) = &*guard {
if value == &block_regex {
return regex.is_match(domain_or_ip);
}
}
// If we don't have a regex stored, or it's not up to date, recreate it
let regex = Regex::new(&block_regex).unwrap();
let is_match = regex.is_match(domain_or_ip);
*guard = Some((block_regex, regex));
is_match
}
fn should_block_host(host: Host<&str>) -> Result<(), CustomHttpClientError> {
let (ip, host_str): (Option<IpAddr>, String) = match host {
url::Host::Ipv4(ip) => (Some(ip.into()), ip.to_string()),
url::Host::Ipv6(ip) => (Some(ip.into()), ip.to_string()),
url::Host::Domain(d) => (None, d.to_string()),
};
if let Some(ip) = ip {
if should_block_ip(ip) {
return Err(CustomHttpClientError::NonGlobalIp {
domain: None,
ip,
});
}
}
if should_block_address_regex(&host_str) {
return Err(CustomHttpClientError::Blocked {
domain: host_str,
});
}
Ok(())
}
#[derive(Debug, Clone)]
pub enum CustomHttpClientError {
Blocked {
domain: String,
},
NonGlobalIp {
domain: Option<String>,
ip: IpAddr,
},
}
impl CustomHttpClientError {
pub fn downcast_ref(e: &dyn std::error::Error) -> Option<&Self> {
let mut source = e.source();
while let Some(err) = source {
source = err.source();
if let Some(err) = err.downcast_ref::<CustomHttpClientError>() {
return Some(err);
}
}
None
}
}
impl fmt::Display for CustomHttpClientError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::Blocked {
domain,
} => write!(f, "Blocked domain: {domain} matched HTTP_REQUEST_BLOCK_REGEX"),
Self::NonGlobalIp {
domain: Some(domain),
ip,
} => write!(f, "IP {ip} for domain '{domain}' is not a global IP!"),
Self::NonGlobalIp {
domain: None,
ip,
} => write!(f, "IP {ip} is not a global IP!"),
}
}
}
impl std::error::Error for CustomHttpClientError {}
#[derive(Debug, Clone)]
enum CustomDnsResolver {
Default(),
Hickory(Arc<TokioAsyncResolver>),
}
type BoxError = Box<dyn std::error::Error + Send + Sync>;
impl CustomDnsResolver {
fn instance() -> Arc<Self> {
static INSTANCE: Lazy<Arc<CustomDnsResolver>> = Lazy::new(CustomDnsResolver::new);
Arc::clone(&*INSTANCE)
}
fn new() -> Arc<Self> {
match read_system_conf() {
Ok((config, opts)) => {
let resolver = TokioAsyncResolver::tokio(config.clone(), opts.clone());
Arc::new(Self::Hickory(Arc::new(resolver)))
}
Err(e) => {
warn!("Error creating Hickory resolver, falling back to default: {e:?}");
Arc::new(Self::Default())
}
}
}
// Note that we get an iterator of addresses, but we only grab the first one for convenience
async fn resolve_domain(&self, name: &str) -> Result<Option<SocketAddr>, BoxError> {
pre_resolve(name)?;
let result = match self {
Self::Default() => tokio::net::lookup_host(name).await?.next(),
Self::Hickory(r) => r.lookup_ip(name).await?.iter().next().map(|a| SocketAddr::new(a, 0)),
};
if let Some(addr) = &result {
post_resolve(name, addr.ip())?;
}
Ok(result)
}
}
fn pre_resolve(name: &str) -> Result<(), CustomHttpClientError> {
if should_block_address(name) {
return Err(CustomHttpClientError::Blocked {
domain: name.to_string(),
});
}
Ok(())
}
fn post_resolve(name: &str, ip: IpAddr) -> Result<(), CustomHttpClientError> {
if should_block_ip(ip) {
Err(CustomHttpClientError::NonGlobalIp {
domain: Some(name.to_string()),
ip,
})
} else {
Ok(())
}
}
impl Resolve for CustomDnsResolver {
fn resolve(&self, name: Name) -> Resolving {
let this = self.clone();
Box::pin(async move {
let name = name.as_str();
let result = this.resolve_domain(name).await?;
Ok::<reqwest::dns::Addrs, _>(Box::new(result.into_iter()))
})
}
}

1
src/main.rs
View File

@ -47,6 +47,7 @@ mod config;
mod crypto;
#[macro_use]
mod db;
mod http_client;
mod mail;
mod ratelimit;
mod util;

146
src/util.rs
View File

@ -4,7 +4,6 @@
use std::{collections::HashMap, io::Cursor, ops::Deref, path::Path};
use num_traits::ToPrimitive;
use once_cell::sync::Lazy;
use rocket::{
fairing::{Fairing, Info, Kind},
http::{ContentType, Header, HeaderMap, Method, Status},
@ -686,19 +685,6 @@ where
}
}
use reqwest::{header, Client, ClientBuilder};
pub fn get_reqwest_client() -> &'static Client {
static INSTANCE: Lazy<Client> = Lazy::new(|| get_reqwest_client_builder().build().expect("Failed to build client"));
&INSTANCE
}
pub fn get_reqwest_client_builder() -> ClientBuilder {
let mut headers = header::HeaderMap::new();
headers.insert(header::USER_AGENT, header::HeaderValue::from_static("Vaultwarden"));
Client::builder().default_headers(headers).timeout(Duration::from_secs(10))
}
pub fn convert_json_key_lcase_first(src_json: Value) -> Value {
match src_json {
Value::Array(elm) => {
@ -750,138 +736,6 @@ pub fn parse_experimental_client_feature_flags(experimental_client_feature_flags
feature_states
}
mod dns_resolver {
use std::{
fmt,
net::{IpAddr, SocketAddr},
sync::Arc,
};
use hickory_resolver::{system_conf::read_system_conf, TokioAsyncResolver};
use once_cell::sync::Lazy;
use reqwest::dns::{Name, Resolve, Resolving};
use crate::{util::is_global, CONFIG};
#[derive(Debug, Clone)]
pub enum CustomResolverError {
Blacklist {
domain: String,
},
NonGlobalIp {
domain: String,
ip: IpAddr,
},
}
impl CustomResolverError {
pub fn downcast_ref(e: &dyn std::error::Error) -> Option<&Self> {
let mut source = e.source();
while let Some(err) = source {
source = err.source();
if let Some(err) = err.downcast_ref::<CustomResolverError>() {
return Some(err);
}
}
None
}
}
impl fmt::Display for CustomResolverError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::Blacklist {
domain,
} => write!(f, "Blacklisted domain: {domain} matched ICON_BLACKLIST_REGEX"),
Self::NonGlobalIp {
domain,
ip,
} => write!(f, "IP {ip} for domain '{domain}' is not a global IP!"),
}
}
}
impl std::error::Error for CustomResolverError {}
#[derive(Debug, Clone)]
pub enum CustomDnsResolver {
Default(),
Hickory(Arc<TokioAsyncResolver>),
}
type BoxError = Box<dyn std::error::Error + Send + Sync>;
impl CustomDnsResolver {
pub fn instance() -> Arc<Self> {
static INSTANCE: Lazy<Arc<CustomDnsResolver>> = Lazy::new(CustomDnsResolver::new);
Arc::clone(&*INSTANCE)
}
fn new() -> Arc<Self> {
match read_system_conf() {
Ok((config, opts)) => {
let resolver = TokioAsyncResolver::tokio(config.clone(), opts.clone());
Arc::new(Self::Hickory(Arc::new(resolver)))
}
Err(e) => {
warn!("Error creating Hickory resolver, falling back to default: {e:?}");
Arc::new(Self::Default())
}
}
}
// Note that we get an iterator of addresses, but we only grab the first one for convenience
async fn resolve_domain(&self, name: &str) -> Result<Option<SocketAddr>, BoxError> {
pre_resolve(name)?;
let result = match self {
Self::Default() => tokio::net::lookup_host(name).await?.next(),
Self::Hickory(r) => r.lookup_ip(name).await?.iter().next().map(|a| SocketAddr::new(a, 0)),
};
if let Some(addr) = &result {
post_resolve(name, addr.ip())?;
}
Ok(result)
}
}
fn pre_resolve(name: &str) -> Result<(), CustomResolverError> {
if crate::api::is_domain_blacklisted(name) {
return Err(CustomResolverError::Blacklist {
domain: name.to_string(),
});
}
Ok(())
}
fn post_resolve(name: &str, ip: IpAddr) -> Result<(), CustomResolverError> {
if CONFIG.icon_blacklist_non_global_ips() && !is_global(ip) {
Err(CustomResolverError::NonGlobalIp {
domain: name.to_string(),
ip,
})
} else {
Ok(())
}
}
impl Resolve for CustomDnsResolver {
fn resolve(&self, name: Name) -> Resolving {
let this = self.clone();
Box::pin(async move {
let name = name.as_str();
let result = this.resolve_domain(name).await?;
Ok::<reqwest::dns::Addrs, _>(Box::new(result.into_iter()))
})
}
}
}
pub use dns_resolver::{CustomDnsResolver, CustomResolverError};
/// TODO: This is extracted from IpAddr::is_global, which is unstable:
/// https://doc.rust-lang.org/nightly/std/net/enum.IpAddr.html#method.is_global
/// Remove once https://github.com/rust-lang/rust/issues/27709 is merged