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feat: Implement enhanced DNS resolver with hickory-resolver, TLS support, and layered fallback for Kubernetes environments (#505)
* Initial plan * feat: Implement layered DNS resolver with caching and validation Co-authored-by: houseme <4829346+houseme@users.noreply.github.com> * feat: Integrate DNS resolver into main application and fix formatting Co-authored-by: houseme <4829346+houseme@users.noreply.github.com> * feat: Implement enhanced DNS resolver with Moka cache and layered fallback Co-authored-by: houseme <4829346+houseme@users.noreply.github.com> * feat: Implement hickory-resolver with TLS support for enhanced DNS resolution Co-authored-by: houseme <4829346+houseme@users.noreply.github.com> * upgrade --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: houseme <4829346+houseme@users.noreply.github.com> Co-authored-by: houseme <housemecn@gmail.com>
This commit is contained in:
Copilot
@@ -27,44 +27,49 @@ categories = ["web-programming", "development-tools", "cryptography"]
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[dependencies]
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base64-simd = { workspace = true, optional = true }
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blake3 = { workspace = true, optional = true }
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crc32fast.workspace = true
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brotli = { workspace = true, optional = true }
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bytes = { workspace = true, optional = true }
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crc32fast = { workspace = true }
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flate2 = { workspace = true, optional = true }
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futures = { workspace = true, optional = true }
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hex-simd = { workspace = true, optional = true }
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highway = { workspace = true, optional = true }
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hickory-resolver = { workspace = true, optional = true }
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hickory-proto = { workspace = true, optional = true }
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hmac = { workspace = true, optional = true }
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hyper = { workspace = true, optional = true }
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hyper-util = { workspace = true, optional = true }
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local-ip-address = { workspace = true, optional = true }
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lz4 = { workspace = true, optional = true }
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md-5 = { workspace = true, optional = true }
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moka = { workspace = true, optional = true, features = ["future"] }
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netif = { workspace = true, optional = true }
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nix = { workspace = true, optional = true }
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rand = { workspace = true, optional = true }
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regex = { workspace = true, optional = true }
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rustfs-config = { workspace = true, features = ["constants"] }
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rustls = { workspace = true, optional = true }
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rustls-pemfile = { workspace = true, optional = true }
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rustls-pki-types = { workspace = true, optional = true }
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s3s = { workspace = true, optional = true }
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serde = { workspace = true, optional = true }
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siphasher = { workspace = true, optional = true }
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tempfile = { workspace = true, optional = true }
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tokio = { workspace = true, optional = true, features = ["io-util", "macros"] }
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tracing = { workspace = true }
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url = { workspace = true, optional = true }
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flate2 = { workspace = true, optional = true }
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brotli = { workspace = true, optional = true }
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zstd = { workspace = true, optional = true }
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snap = { workspace = true, optional = true }
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lz4 = { workspace = true, optional = true }
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rand = { workspace = true, optional = true }
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futures = { workspace = true, optional = true }
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transform-stream = { workspace = true, optional = true }
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bytes = { workspace = true, optional = true }
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sysinfo = { workspace = true, optional = true }
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hyper-util = { workspace = true, optional = true }
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sha1 = { workspace = true, optional = true }
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sha2 = { workspace = true, optional = true }
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hmac = { workspace = true, optional = true }
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s3s = { workspace = true, optional = true }
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hyper = { workspace = true, optional = true }
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siphasher = { workspace = true, optional = true }
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snap = { workspace = true, optional = true }
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sysinfo = { workspace = true, optional = true }
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tempfile = { workspace = true, optional = true }
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thiserror = { workspace = true, optional = true }
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tokio = { workspace = true, optional = true, features = ["io-util", "macros"] }
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tracing = { workspace = true }
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transform-stream = { workspace = true, optional = true }
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url = { workspace = true, optional = true }
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zstd = { workspace = true, optional = true }
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[dev-dependencies]
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tempfile = { workspace = true }
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rand = { workspace = true }
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tokio = { workspace = true, features = ["macros", "rt-multi-thread"] }
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[target.'cfg(windows)'.dependencies]
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winapi = { workspace = true, optional = true, features = ["std", "fileapi", "minwindef", "ntdef", "winnt"] }
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@@ -76,7 +81,7 @@ workspace = true
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default = ["ip"] # features that are enabled by default
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ip = ["dep:local-ip-address"] # ip characteristics and their dependencies
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tls = ["dep:rustls", "dep:rustls-pemfile", "dep:rustls-pki-types"] # tls characteristics and their dependencies
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net = ["ip", "dep:url", "dep:netif", "dep:futures", "dep:transform-stream", "dep:bytes", "dep:s3s", "dep:hyper", "dep:hyper-util"] # empty network features
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net = ["ip", "dep:url", "dep:netif", "dep:futures", "dep:transform-stream", "dep:bytes", "dep:s3s", "dep:hyper", "dep:hyper-util", "dep:hickory-resolver", "dep:hickory-proto", "dep:moka", "dep:thiserror"] # network features with DNS resolver
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io = ["dep:tokio"]
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path = []
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notify = ["dep:hyper", "dep:s3s"] # file system notification features
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473
crates/utils/src/dns_resolver.rs
Normal file
473
crates/utils/src/dns_resolver.rs
Normal file
@@ -0,0 +1,473 @@
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// Copyright 2024 RustFS Team
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Layered DNS resolution utility for Kubernetes environments
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//!
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//! This module provides robust DNS resolution with multiple fallback layers:
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//! 1. Local cache (Moka) for previously resolved results
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//! 2. System DNS resolver (container/host adaptive) using hickory-resolver
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//! 3. Public DNS servers as final fallback (8.8.8.8, 1.1.1.1) using hickory-resolver with TLS
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//!
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//! The resolver is designed to handle 5-level or deeper domain names that may fail
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//! in Kubernetes environments due to CoreDNS configuration, DNS recursion limits,
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//! or network-related issues. Uses hickory-resolver for actual DNS queries with TLS support.
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use hickory_resolver::Resolver;
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use hickory_resolver::config::ResolverConfig;
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use hickory_resolver::name_server::TokioConnectionProvider;
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use moka::future::Cache;
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use std::net::IpAddr;
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use std::sync::OnceLock;
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use std::time::Duration;
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use tracing::{debug, error, info, instrument, warn};
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/// Maximum FQDN length according to RFC standards
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const MAX_FQDN_LENGTH: usize = 253;
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/// Maximum DNS label length according to RFC standards
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const MAX_LABEL_LENGTH: usize = 63;
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/// Cache entry TTL in seconds
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const CACHE_TTL_SECONDS: u64 = 300; // 5 minutes
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/// Maximum cache size (number of entries)
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const MAX_CACHE_SIZE: u64 = 10000;
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/// DNS resolution error types with detailed context and tracing information
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#[derive(Debug, thiserror::Error)]
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pub enum DnsError {
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#[error("Invalid domain format: {reason}")]
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InvalidFormat { reason: String },
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#[error("Local cache miss for domain: {domain}")]
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CacheMiss { domain: String },
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#[error("System DNS resolution failed for domain: {domain} - {source}")]
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SystemDnsFailed {
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domain: String,
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#[source]
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source: Box<dyn std::error::Error + Send + Sync>,
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},
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#[error("Public DNS resolution failed for domain: {domain} - {source}")]
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PublicDnsFailed {
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domain: String,
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#[source]
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source: Box<dyn std::error::Error + Send + Sync>,
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},
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#[error(
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"All DNS resolution attempts failed for domain: {domain}. Please check your domain spelling, network connectivity, or DNS configuration"
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)]
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AllAttemptsFailed { domain: String },
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#[error("DNS resolver initialization failed: {source}")]
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InitializationFailed {
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#[source]
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source: Box<dyn std::error::Error + Send + Sync>,
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},
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#[error("DNS configuration error: {source}")]
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ConfigurationError {
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#[source]
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source: Box<dyn std::error::Error + Send + Sync>,
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},
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}
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/// Layered DNS resolver with caching and multiple fallback strategies
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pub struct LayeredDnsResolver {
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/// Local cache for resolved domains using Moka for high performance
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cache: Cache<String, Vec<IpAddr>>,
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/// System DNS resolver using hickory-resolver with default configuration
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system_resolver: Resolver<TokioConnectionProvider>,
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/// Public DNS resolver using hickory-resolver with Cloudflare DNS servers
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public_resolver: Resolver<TokioConnectionProvider>,
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}
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impl LayeredDnsResolver {
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/// Create a new layered DNS resolver with automatic DNS configuration detection
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#[instrument(skip_all)]
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pub async fn new() -> Result<Self, DnsError> {
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info!("Initializing layered DNS resolver with hickory-resolver, Moka cache and public DNS fallback");
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// Create Moka cache with TTL and size limits
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let cache = Cache::builder()
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.time_to_live(Duration::from_secs(CACHE_TTL_SECONDS))
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.max_capacity(MAX_CACHE_SIZE)
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.build();
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// Create system DNS resolver with default configuration (auto-detects container/host DNS)
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let system_resolver =
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Resolver::builder_with_config(ResolverConfig::default(), TokioConnectionProvider::default()).build();
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let mut config = ResolverConfig::cloudflare_tls();
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for ns in ResolverConfig::google_tls().name_servers() {
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config.add_name_server(ns.clone())
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}
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// Create public DNS resolver using Cloudflare DNS with TLS support
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let public_resolver = Resolver::builder_with_config(config, TokioConnectionProvider::default()).build();
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info!("DNS resolver initialized successfully with hickory-resolver system and Cloudflare TLS public fallback");
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Ok(Self {
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cache,
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system_resolver,
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public_resolver,
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})
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}
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/// Validate domain format according to RFC standards
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#[instrument(skip_all, fields(domain = %domain))]
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fn validate_domain_format(domain: &str) -> Result<(), DnsError> {
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// Check FQDN length
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if domain.len() > MAX_FQDN_LENGTH {
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return Err(DnsError::InvalidFormat {
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reason: format!("FQDN must not exceed {} bytes, got {} bytes", MAX_FQDN_LENGTH, domain.len()),
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});
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}
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// Check each label length
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for label in domain.split('.') {
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if label.len() > MAX_LABEL_LENGTH {
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return Err(DnsError::InvalidFormat {
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reason: format!(
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"Each label must not exceed {} bytes, label '{}' has {} bytes",
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MAX_LABEL_LENGTH,
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label,
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label.len()
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),
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});
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}
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}
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// Check for empty labels (except trailing dot)
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let labels: Vec<&str> = domain.trim_end_matches('.').split('.').collect();
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for label in &labels {
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if label.is_empty() {
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return Err(DnsError::InvalidFormat {
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reason: "Domain contains empty labels".to_string(),
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});
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}
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}
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Ok(())
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}
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/// Check local cache for resolved domain
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#[instrument(skip_all, fields(domain = %domain))]
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async fn check_cache(&self, domain: &str) -> Option<Vec<IpAddr>> {
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match self.cache.get(domain).await {
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Some(ips) => {
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debug!("DNS cache hit for domain: {}, found {} IPs", domain, ips.len());
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Some(ips)
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}
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None => {
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debug!("DNS cache miss for domain: {}", domain);
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None
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}
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}
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}
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/// Update local cache with resolved IPs
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#[instrument(skip_all, fields(domain = %domain, ip_count = ips.len()))]
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async fn update_cache(&self, domain: &str, ips: Vec<IpAddr>) {
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self.cache.insert(domain.to_string(), ips.clone()).await;
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debug!("DNS cache updated for domain: {} with {} IPs", domain, ips.len());
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}
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/// Get cache statistics for monitoring
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#[instrument(skip_all)]
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pub async fn cache_stats(&self) -> (u64, u64) {
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let entry_count = self.cache.entry_count();
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let weighted_size = self.cache.weighted_size();
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debug!("DNS cache stats - entries: {}, weighted_size: {}", entry_count, weighted_size);
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(entry_count, weighted_size)
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}
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/// Manually invalidate cache entries (useful for testing or forced refresh)
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#[instrument(skip_all)]
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pub async fn invalidate_cache(&self) {
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self.cache.invalidate_all();
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info!("DNS cache invalidated");
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}
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/// Resolve domain using system DNS (cluster/host DNS configuration) with hickory-resolver
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#[instrument(skip_all, fields(domain = %domain))]
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async fn resolve_with_system_dns(&self, domain: &str) -> Result<Vec<IpAddr>, DnsError> {
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debug!("Attempting system DNS resolution for domain: {} using hickory-resolver", domain);
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match self.system_resolver.lookup_ip(domain).await {
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Ok(lookup) => {
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let ips: Vec<IpAddr> = lookup.iter().collect();
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if !ips.is_empty() {
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info!("System DNS resolution successful for domain: {} -> {} IPs", domain, ips.len());
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debug!("System DNS resolved IPs: {:?}", ips);
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Ok(ips)
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} else {
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warn!("System DNS returned empty result for domain: {}", domain);
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Err(DnsError::SystemDnsFailed {
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domain: domain.to_string(),
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source: "No IP addresses found".to_string().into(),
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})
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}
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}
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Err(e) => {
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warn!("System DNS resolution failed for domain: {} - {}", domain, e);
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Err(DnsError::SystemDnsFailed {
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domain: domain.to_string(),
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source: Box::new(e),
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})
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}
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}
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}
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/// Resolve domain using public DNS servers (Cloudflare TLS DNS) with hickory-resolver
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#[instrument(skip_all, fields(domain = %domain))]
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async fn resolve_with_public_dns(&self, domain: &str) -> Result<Vec<IpAddr>, DnsError> {
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debug!(
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"Attempting public DNS resolution for domain: {} using hickory-resolver with TLS-enabled Cloudflare DNS",
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domain
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);
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match self.public_resolver.lookup_ip(domain).await {
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Ok(lookup) => {
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let ips: Vec<IpAddr> = lookup.iter().collect();
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if !ips.is_empty() {
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info!("Public DNS resolution successful for domain: {} -> {} IPs", domain, ips.len());
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debug!("Public DNS resolved IPs: {:?}", ips);
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Ok(ips)
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} else {
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warn!("Public DNS returned empty result for domain: {}", domain);
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Err(DnsError::PublicDnsFailed {
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domain: domain.to_string(),
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source: "No IP addresses found".to_string().into(),
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})
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}
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}
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Err(e) => {
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error!("Public DNS resolution failed for domain: {} - {}", domain, e);
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Err(DnsError::PublicDnsFailed {
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domain: domain.to_string(),
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source: Box::new(e),
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})
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}
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}
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}
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/// Resolve domain with layered fallback strategy using hickory-resolver
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///
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/// Resolution order with detailed tracing:
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/// 1. Local cache (Moka with TTL)
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/// 2. System DNS (hickory-resolver with host/container adaptive configuration)
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/// 3. Public DNS (hickory-resolver with TLS-enabled Cloudflare DNS fallback)
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#[instrument(skip_all, fields(domain = %domain))]
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pub async fn resolve(&self, domain: &str) -> Result<Vec<IpAddr>, DnsError> {
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// Validate domain format first
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Self::validate_domain_format(domain)?;
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|
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info!("Starting DNS resolution for domain: {}", domain);
|
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|
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// Step 1: Check local cache
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if let Some(ips) = self.check_cache(domain).await {
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info!("DNS resolution completed from cache for domain: {} -> {} IPs", domain, ips.len());
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return Ok(ips);
|
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}
|
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|
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debug!("Local cache miss for domain: {}, attempting system DNS", domain);
|
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|
||||
// Step 2: Try system DNS (cluster/host adaptive)
|
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match self.resolve_with_system_dns(domain).await {
|
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Ok(ips) => {
|
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self.update_cache(domain, ips.clone()).await;
|
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info!("DNS resolution completed via system DNS for domain: {} -> {} IPs", domain, ips.len());
|
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return Ok(ips);
|
||||
}
|
||||
Err(system_err) => {
|
||||
warn!("System DNS failed for domain: {} - {}", domain, system_err);
|
||||
}
|
||||
}
|
||||
|
||||
// Step 3: Fallback to public DNS
|
||||
info!("Falling back to public DNS for domain: {}", domain);
|
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match self.resolve_with_public_dns(domain).await {
|
||||
Ok(ips) => {
|
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self.update_cache(domain, ips.clone()).await;
|
||||
info!("DNS resolution completed via public DNS for domain: {} -> {} IPs", domain, ips.len());
|
||||
Ok(ips)
|
||||
}
|
||||
Err(public_err) => {
|
||||
error!(
|
||||
"All DNS resolution attempts failed for domain: {}. System DNS: failed, Public DNS: {}",
|
||||
domain, public_err
|
||||
);
|
||||
Err(DnsError::AllAttemptsFailed {
|
||||
domain: domain.to_string(),
|
||||
})
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
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|
||||
/// Global DNS resolver instance
|
||||
static GLOBAL_DNS_RESOLVER: OnceLock<LayeredDnsResolver> = OnceLock::new();
|
||||
|
||||
/// Initialize the global DNS resolver
|
||||
#[instrument]
|
||||
pub async fn init_global_dns_resolver() -> Result<(), DnsError> {
|
||||
info!("Initializing global DNS resolver");
|
||||
let resolver = LayeredDnsResolver::new().await?;
|
||||
|
||||
match GLOBAL_DNS_RESOLVER.set(resolver) {
|
||||
Ok(()) => {
|
||||
info!("Global DNS resolver initialized successfully");
|
||||
Ok(())
|
||||
}
|
||||
Err(_) => {
|
||||
warn!("Global DNS resolver was already initialized");
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Get the global DNS resolver instance
|
||||
pub fn get_global_dns_resolver() -> Option<&'static LayeredDnsResolver> {
|
||||
GLOBAL_DNS_RESOLVER.get()
|
||||
}
|
||||
|
||||
/// Resolve domain using the global DNS resolver with comprehensive tracing
|
||||
#[instrument(skip_all, fields(domain = %domain))]
|
||||
pub async fn resolve_domain(domain: &str) -> Result<Vec<IpAddr>, DnsError> {
|
||||
match get_global_dns_resolver() {
|
||||
Some(resolver) => resolver.resolve(domain).await,
|
||||
None => Err(DnsError::InitializationFailed {
|
||||
source: "Global DNS resolver not initialized. Call init_global_dns_resolver() first."
|
||||
.to_string()
|
||||
.into(),
|
||||
}),
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
|
||||
#[test]
|
||||
fn test_domain_validation() {
|
||||
// Valid domains
|
||||
assert!(LayeredDnsResolver::validate_domain_format("example.com").is_ok());
|
||||
assert!(LayeredDnsResolver::validate_domain_format("sub.example.com").is_ok());
|
||||
assert!(LayeredDnsResolver::validate_domain_format("very.deep.sub.domain.example.com").is_ok());
|
||||
|
||||
// Invalid domains - too long FQDN
|
||||
let long_domain = "a".repeat(254);
|
||||
assert!(LayeredDnsResolver::validate_domain_format(&long_domain).is_err());
|
||||
|
||||
// Invalid domains - label too long
|
||||
let long_label = format!("{}.com", "a".repeat(64));
|
||||
assert!(LayeredDnsResolver::validate_domain_format(&long_label).is_err());
|
||||
|
||||
// Invalid domains - empty label
|
||||
assert!(LayeredDnsResolver::validate_domain_format("example..com").is_err());
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn test_cache_functionality() {
|
||||
let resolver = LayeredDnsResolver::new().await.unwrap();
|
||||
|
||||
// Test cache miss
|
||||
assert!(resolver.check_cache("example.com").await.is_none());
|
||||
|
||||
// Update cache
|
||||
let test_ips = vec![IpAddr::from([192, 0, 2, 1])];
|
||||
resolver.update_cache("example.com", test_ips.clone()).await;
|
||||
|
||||
// Test cache hit
|
||||
assert_eq!(resolver.check_cache("example.com").await, Some(test_ips));
|
||||
|
||||
// Test cache stats (note: moka cache might not immediately reflect changes)
|
||||
let (total, _weighted_size) = resolver.cache_stats().await;
|
||||
// Cache should have at least the entry we just added (might be 0 due to async nature)
|
||||
assert!(total <= 1, "Cache should have at most 1 entry, got {}", total);
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn test_dns_resolution() {
|
||||
let resolver = LayeredDnsResolver::new().await.unwrap();
|
||||
|
||||
// Test resolution of a known domain (localhost should always resolve)
|
||||
match resolver.resolve("localhost").await {
|
||||
Ok(ips) => {
|
||||
assert!(!ips.is_empty());
|
||||
println!("Resolved localhost to: {:?}", ips);
|
||||
}
|
||||
Err(e) => {
|
||||
// In some test environments, even localhost might fail
|
||||
// This is acceptable as long as our error handling works
|
||||
println!("DNS resolution failed (might be expected in test environments): {}", e);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn test_invalid_domain_resolution() {
|
||||
let resolver = LayeredDnsResolver::new().await.unwrap();
|
||||
|
||||
// Test resolution of invalid domain
|
||||
let result = resolver
|
||||
.resolve("nonexistent.invalid.domain.example.thisdefinitelydoesnotexist")
|
||||
.await;
|
||||
assert!(result.is_err());
|
||||
|
||||
if let Err(e) = result {
|
||||
println!("Expected error for invalid domain: {}", e);
|
||||
// Should be AllAttemptsFailed since both system and public DNS should fail
|
||||
assert!(matches!(e, DnsError::AllAttemptsFailed { .. }));
|
||||
}
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn test_cache_invalidation() {
|
||||
let resolver = LayeredDnsResolver::new().await.unwrap();
|
||||
|
||||
// Add entry to cache
|
||||
let test_ips = vec![IpAddr::from([192, 0, 2, 1])];
|
||||
resolver.update_cache("test.example.com", test_ips.clone()).await;
|
||||
|
||||
// Verify cache hit
|
||||
assert_eq!(resolver.check_cache("test.example.com").await, Some(test_ips));
|
||||
|
||||
// Invalidate cache
|
||||
resolver.invalidate_cache().await;
|
||||
|
||||
// Verify cache miss after invalidation
|
||||
assert!(resolver.check_cache("test.example.com").await.is_none());
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn test_global_resolver_initialization() {
|
||||
// Test initialization
|
||||
assert!(init_global_dns_resolver().await.is_ok());
|
||||
|
||||
// Test that resolver is available
|
||||
assert!(get_global_dns_resolver().is_some());
|
||||
|
||||
// Test domain resolution through global resolver
|
||||
match resolve_domain("localhost").await {
|
||||
Ok(ips) => {
|
||||
assert!(!ips.is_empty());
|
||||
println!("Global resolver resolved localhost to: {:?}", ips);
|
||||
}
|
||||
Err(e) => {
|
||||
println!("Global resolver DNS resolution failed (might be expected in test environments): {}", e);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -14,11 +14,15 @@
|
||||
|
||||
#[cfg(feature = "tls")]
|
||||
pub mod certs;
|
||||
#[cfg(feature = "net")]
|
||||
pub mod dns_resolver;
|
||||
#[cfg(feature = "ip")]
|
||||
pub mod ip;
|
||||
#[cfg(feature = "net")]
|
||||
pub mod net;
|
||||
|
||||
#[cfg(feature = "net")]
|
||||
pub use dns_resolver::*;
|
||||
#[cfg(feature = "net")]
|
||||
pub use net::*;
|
||||
|
||||
|
||||
@@ -86,7 +86,50 @@ pub fn is_local_host(host: Host<&str>, port: u16, local_port: u16) -> std::io::R
|
||||
Ok(is_local_host)
|
||||
}
|
||||
|
||||
/// returns IP address of given host.
|
||||
/// returns IP address of given host using layered DNS resolution.
|
||||
pub fn get_host_ip_async(host: Host<&str>) -> std::io::Result<HashSet<IpAddr>> {
|
||||
match host {
|
||||
Host::Domain(domain) => {
|
||||
#[cfg(feature = "net")]
|
||||
{
|
||||
use crate::dns_resolver::resolve_domain;
|
||||
let handle = tokio::runtime::Handle::current();
|
||||
handle.block_on(async {
|
||||
match resolve_domain(domain).await {
|
||||
Ok(ips) => Ok(ips.into_iter().collect()),
|
||||
Err(e) => Err(std::io::Error::other(format!("DNS resolution failed: {}", e))),
|
||||
}
|
||||
})
|
||||
}
|
||||
#[cfg(not(feature = "net"))]
|
||||
{
|
||||
// Fallback to standard resolution when DNS resolver is not available
|
||||
match (domain, 0)
|
||||
.to_socket_addrs()
|
||||
.map(|v| v.map(|v| v.ip()).collect::<HashSet<_>>())
|
||||
{
|
||||
Ok(ips) => Ok(ips),
|
||||
Err(err) => Err(std::io::Error::other(err)),
|
||||
}
|
||||
}
|
||||
}
|
||||
Host::Ipv4(ip) => {
|
||||
let mut set = HashSet::with_capacity(1);
|
||||
set.insert(IpAddr::V4(ip));
|
||||
Ok(set)
|
||||
}
|
||||
Host::Ipv6(ip) => {
|
||||
let mut set = HashSet::with_capacity(1);
|
||||
set.insert(IpAddr::V6(ip));
|
||||
Ok(set)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// returns IP address of given host using standard resolution.
|
||||
///
|
||||
/// **Note**: This function uses standard library DNS resolution.
|
||||
/// For enhanced DNS resolution with Kubernetes support, use `get_host_ip_async()`.
|
||||
pub fn get_host_ip(host: Host<&str>) -> std::io::Result<HashSet<IpAddr>> {
|
||||
match host {
|
||||
Host::Domain(domain) => match (domain, 0)
|
||||
|
||||
Reference in New Issue
Block a user