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+[dev-dependencies] +tokio-test = "0.4" +tower = { version = "0.5", features = ["util"] } diff --git a/DEVELOP.md b/DEVELOP.md index da48b76..9aa3e8d 100644 --- a/DEVELOP.md +++ b/DEVELOP.md @@ -85,7 +85,7 @@ See [docs/plan.md](docs/plan.md) for the full project plan and milestone checkli | Milestone | Status | |-----------|--------| -| M1 โ€” Core Forwarding | ๐Ÿ”ฒ Not started | +| M1 โ€” Core Forwarding | โœ… Done | | M2 โ€” Multiple Upstreams & Config | ๐Ÿ”ฒ Not started | | M3 โ€” Caching | ๐Ÿ”ฒ Not started | | M4 โ€” Observability | ๐Ÿ”ฒ Not started | diff --git a/config/default.toml b/config/default.toml new file mode 100644 index 0000000..352a8ec --- /dev/null +++ b/config/default.toml @@ -0,0 +1,14 @@ +[server] +listen = "0.0.0.0:8800" + +[upstream] +resolvers = [ + { name = "cloudflare", url = "https://cloudflare-dns.com/dns-query" }, + { name = "google", url = "https://dns.google/dns-query" }, +] +strategy = "round-robin" + +[cache] +enabled = true +max_entries = 10000 +max_ttl_secs = 3600 diff --git a/docs/plan.md b/docs/plan.md index e7c1f2a..b5239c3 100644 --- a/docs/plan.md +++ b/docs/plan.md @@ -37,12 +37,12 @@ A lightweight DNS-over-HTTPS (DoH) forwarder that accepts DNS queries over HTTPS ### M1 โ€” Core Forwarding -- [ ] Project scaffold (Cargo workspace, CI) -- [ ] HTTP server with `/dns-query` endpoint (GET + POST) -- [ ] Parse incoming DNS wire-format queries -- [ ] Forward to a single upstream DoH resolver -- [ ] Return DNS wire-format response -- [ ] Basic integration test +- [x] Project scaffold (Cargo workspace, CI) +- [x] HTTP server with `/dns-query` endpoint (GET + POST) +- [x] Parse incoming DNS wire-format queries +- [x] Forward to a single upstream DoH resolver +- [x] Return DNS wire-format response +- [x] Basic integration test ### M2 โ€” Multiple Upstreams & Config diff --git a/src/config.rs b/src/config.rs new file mode 100644 index 0000000..e185f52 --- /dev/null +++ b/src/config.rs @@ -0,0 +1,117 @@ +use serde::Deserialize; +use std::path::Path; + +/// Top-level application configuration. +#[derive(Debug, Clone, Deserialize)] +pub struct AppConfig { + /// Server configuration. + pub server: ServerConfig, + /// Upstream resolver configuration. + pub upstream: UpstreamConfig, + /// Cache configuration. + #[allow(dead_code)] // Used once M3 caching is implemented + pub cache: CacheConfig, +} + +/// Server bind address and port. +#[derive(Debug, Clone, Deserialize)] +pub struct ServerConfig { + /// Address to listen on (e.g., "0.0.0.0:3000"). + pub listen: String, +} + +/// Upstream DoH resolver settings. +#[derive(Debug, Clone, Deserialize)] +pub struct UpstreamConfig { + /// List of upstream DoH resolvers. + pub resolvers: Vec, + /// Selection strategy: "round-robin" or "failover". + pub strategy: String, +} + +/// A single upstream resolver entry. +#[derive(Debug, Clone, Deserialize)] +pub struct ResolverEntry { + /// Human-readable name (e.g., "cloudflare"). + pub name: String, + /// DoH endpoint URL. + pub url: String, +} + +/// Cache settings. +#[derive(Debug, Clone, Deserialize)] +#[allow(dead_code)] // Fields used once M3 caching is implemented +pub struct CacheConfig { + /// Whether caching is enabled. + pub enabled: bool, + /// Maximum number of cache entries. + pub max_entries: usize, + /// Maximum TTL in seconds (caps per-record TTL). + pub max_ttl_secs: u64, +} + +impl AppConfig { + /// Load configuration from a TOML file, with optional env var overrides. + pub fn load(path: &Path) -> anyhow::Result { + let content = std::fs::read_to_string(path) + .map_err(|e| anyhow::anyhow!("failed to read config file {:?}: {}", path, e))?; + let config: AppConfig = toml::from_str(&content)?; + Ok(config) + } +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn test_parse_default_config() { + let config_str = r#" +[server] +listen = "127.0.0.1:8080" + +[upstream] +resolvers = [ + { name = "cloudflare", url = "https://cloudflare-dns.com/dns-query" }, +] +strategy = "round-robin" + +[cache] +enabled = true +max_entries = 5000 +max_ttl_secs = 300 +"#; + let config: AppConfig = toml::from_str(config_str).unwrap(); + assert_eq!(config.server.listen, "127.0.0.1:8080"); + assert_eq!(config.upstream.resolvers.len(), 1); + assert_eq!(config.upstream.resolvers[0].name, "cloudflare"); + assert_eq!(config.upstream.strategy, "round-robin"); + assert!(config.cache.enabled); + assert_eq!(config.cache.max_entries, 5000); + } + + #[test] + fn test_parse_multiple_resolvers() { + let config_str = r#" +[server] +listen = "0.0.0.0:3000" + +[upstream] +resolvers = [ + { name = "cloudflare", url = "https://cloudflare-dns.com/dns-query" }, + { name = "google", url = "https://dns.google/dns-query" }, + { name = "quad9", url = "https://dns.quad9.net/dns-query" }, +] +strategy = "failover" + +[cache] +enabled = false +max_entries = 0 +max_ttl_secs = 0 +"#; + let config: AppConfig = toml::from_str(config_str).unwrap(); + assert_eq!(config.upstream.resolvers.len(), 3); + assert_eq!(config.upstream.strategy, "failover"); + assert!(!config.cache.enabled); + } +} diff --git a/src/dns/mod.rs b/src/dns/mod.rs new file mode 100644 index 0000000..60c0187 --- /dev/null +++ b/src/dns/mod.rs @@ -0,0 +1,4 @@ +//! DNS wire-format parsing and response building. + +pub mod query; +pub mod response; diff --git a/src/dns/query.rs b/src/dns/query.rs new file mode 100644 index 0000000..3f4fdb4 --- /dev/null +++ b/src/dns/query.rs @@ -0,0 +1,55 @@ +use hickory_proto::op::Message; + +/// Errors that can occur when parsing a DNS query. +#[derive(Debug, thiserror::Error)] +pub enum QueryParseError { + /// The wire-format bytes are not a valid DNS message. + #[error("invalid DNS message: {0}")] + InvalidMessage(#[from] hickory_proto::ProtoError), +} + +/// Parse raw bytes into a DNS [`Message`]. +/// +/// This is used to decode incoming DNS wire-format queries received +/// over the DoH endpoint (RFC 8484). +pub fn parse_query(buf: &[u8]) -> Result { + let message = Message::from_vec(buf)?; + Ok(message) +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn test_parse_valid_dns_query() { + // Minimal valid DNS query for "example.com" A record + #[rustfmt::skip] + let buf: Vec = vec![ + 0xAB, 0xCD, // transaction ID + 0x01, 0x00, // flags: standard query, recursion desired + 0x00, 0x01, // 1 question + 0x00, 0x00, // 0 answers + 0x00, 0x00, // 0 authority + 0x00, 0x00, // 0 additional + // question: example.com A IN + 0x07, b'e', b'x', b'a', b'm', b'p', b'l', b'e', + 0x03, b'c', b'o', b'm', + 0x00, // root label + 0x00, 0x01, // type A + 0x00, 0x01, // class IN + ]; + + let message = parse_query(&buf).unwrap(); + assert_eq!(message.id(), 0xABCD); + assert_eq!(message.queries().len(), 1); + assert_eq!(message.queries()[0].name().to_string(), "example.com."); + } + + #[test] + fn test_parse_invalid_bytes_returns_error() { + let buf = vec![0x00; 3]; // too short + let result = parse_query(&buf); + assert!(result.is_err()); + } +} diff --git a/src/dns/response.rs b/src/dns/response.rs new file mode 100644 index 0000000..794f90a --- /dev/null +++ b/src/dns/response.rs @@ -0,0 +1,76 @@ +use hickory_proto::op::Message; + +/// Errors that can occur when building a DNS response. +#[derive(Debug, thiserror::Error)] +pub enum ResponseBuildError { + /// Serialization of the DNS message failed. + #[error("failed to serialize DNS message: {0}")] + SerializationFailed(#[from] hickory_proto::ProtoError), +} + +/// Serialize a DNS [`Message`] into wire-format bytes. +/// +/// Used to encode the upstream response before returning it to the +/// DoH client. +pub fn serialize_response(message: &Message) -> Result, ResponseBuildError> { + let bytes = message.to_vec()?; + Ok(bytes) +} + +/// Build a SERVFAIL response for a given query message. +/// +/// Used when the upstream resolver is unreachable or returns an error. +pub fn build_servfail(original: &Message) -> Result, ResponseBuildError> { + let mut response = Message::new(); + response.set_id(original.id()); + response.set_response_code(hickory_proto::op::ResponseCode::ServFail); + response.set_recursion_desired(original.recursion_desired()); + response.set_recursion_available(true); + + // Copy the original question section into the response + for query in original.queries() { + response.add_query(query.clone()); + } + + serialize_response(&response) +} + +#[cfg(test)] +mod tests { + use super::*; + use hickory_proto::op::{Message, Query}; + use hickory_proto::rr::RecordType; + + #[test] + fn test_serialize_and_roundtrip() { + let mut msg = Message::new(); + msg.set_id(1234); + msg.set_response_code(hickory_proto::op::ResponseCode::NoError); + + let bytes = serialize_response(&msg).unwrap(); + assert!(!bytes.is_empty()); + + let parsed = Message::from_vec(&bytes).unwrap(); + assert_eq!(parsed.id(), 1234); + } + + #[test] + fn test_build_servfail_preserves_id_and_question() { + let mut query = Message::new(); + query.set_id(5678); + query.add_query(Query::query( + hickory_proto::rr::Name::from_ascii("example.com.").unwrap(), + RecordType::A, + )); + + let response_bytes = build_servfail(&query).unwrap(); + let response = Message::from_vec(&response_bytes).unwrap(); + + assert_eq!(response.id(), 5678); + assert_eq!( + response.response_code(), + hickory_proto::op::ResponseCode::ServFail + ); + assert_eq!(response.queries().len(), 1); + } +} diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..98dfa5d --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,6 @@ +//! A lightweight DNS-over-HTTPS forwarder. + +pub mod config; +pub mod dns; +pub mod routes; +pub mod upstream; diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..ca0d131 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,81 @@ +use std::path::PathBuf; +use std::sync::Arc; + +use anyhow::Context; +use axum::routing::{get, post}; +use axum::{Extension, Router}; +use tokio::net::TcpListener; +use tracing::info; +use tracing_subscriber::EnvFilter; + +use doh_forwarder::config::AppConfig; +use doh_forwarder::routes::{dns_query_get, dns_query_post, AppState}; +use doh_forwarder::upstream::doh_client::DohClient; + +#[tokio::main] +async fn main() -> anyhow::Result<()> { + // Initialize tracing (RUST_LOG env filter, defaults to info) + tracing_subscriber::fmt() + .with_env_filter( + EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info")), + ) + .init(); + + // Parse CLI args for config path + let config_path = parse_config_path(); + info!(path = %config_path.display(), "loading configuration"); + + let config = AppConfig::load(&config_path) + .with_context(|| format!("failed to load config from {:?}", config_path))?; + + info!(listen = %config.server.listen, "starting doh-forwarder"); + info!( + resolvers = config + .upstream + .resolvers + .iter() + .map(|r| r.name.as_str()) + .collect::>() + .join(", "), + strategy = %config.upstream.strategy, + "upstream configuration" + ); + + let doh_client = DohClient::new(config.upstream.resolvers.clone()); + + let state = AppState { + doh_client, + rr_counter: Arc::new(std::sync::atomic::AtomicUsize::new(0)), + }; + + let app = Router::new() + .route("/dns-query", post(dns_query_post).get(dns_query_get)) + .route("/health", get(health)) + .layer(Extension(state)); + + let listener = TcpListener::bind(&config.server.listen) + .await + .with_context(|| format!("failed to bind to {}", config.server.listen))?; + + info!(addr = %listener.local_addr()?, "listening"); + + axum::serve(listener, app).await.context("server error")?; + + Ok(()) +} + +/// Health-check endpoint. +async fn health() -> &'static str { + "ok" +} + +/// Parse the config file path from CLI args, defaulting to `config/default.toml`. +fn parse_config_path() -> PathBuf { + let args: Vec = std::env::args().collect(); + if let Some(pos) = args.iter().position(|a| a == "--config") { + if let Some(path) = args.get(pos + 1) { + return PathBuf::from(path); + } + } + PathBuf::from("config/default.toml") +} diff --git a/src/routes.rs b/src/routes.rs new file mode 100644 index 0000000..23e00f5 --- /dev/null +++ b/src/routes.rs @@ -0,0 +1,139 @@ +use axum::extract::Query; +use axum::http::{header, StatusCode}; +use axum::response::{IntoResponse, Response}; +use axum::Extension; +use base64::Engine; +use std::sync::Arc; +use tracing::{error, info, warn}; + +use crate::dns::query::parse_query; +use crate::dns::response::build_servfail; +use crate::upstream::doh_client::DohClient; + +/// Shared application state passed to route handlers. +#[derive(Clone)] +pub struct AppState { + /// The DoH upstream client. + pub doh_client: DohClient, + /// Round-robin counter for upstream selection. + pub rr_counter: Arc, +} + +/// Query parameters for the GET variant of `/dns-query`. +#[derive(Debug, serde::Deserialize)] +pub struct DnsQueryParams { + /// Base64url-encoded DNS wire-format query (RFC 8484 ยง4.1). + pub dns: String, +} + +/// POST handler for `/dns-query` (RFC 8484 ยง4.2). +/// +/// Expects `Content-Type: application/dns-message` and a raw DNS +/// wire-format body. +pub async fn dns_query_post(Extension(state): Extension, body: bytes::Bytes) -> Response { + let query_bytes = body.to_vec(); + + // Validate that it's a parseable DNS message + let query = match parse_query(&query_bytes) { + Ok(q) => q, + Err(e) => { + warn!(error = %e, "invalid DNS query received"); + return (StatusCode::BAD_REQUEST, "invalid DNS query").into_response(); + } + }; + + let qname = query + .queries() + .first() + .map(|q| q.name().to_string()) + .unwrap_or_default(); + let qtype = query + .queries() + .first() + .map(|q| q.query_type().to_string()) + .unwrap_or_default(); + + info!(query = %qname, qtype = %qtype, "received DoH POST query"); + + forward_and_respond(&state, &query_bytes, &query).await +} + +/// GET handler for `/dns-query` (RFC 8484 ยง4.1). +/// +/// Expects a `?dns=` query parameter. +pub async fn dns_query_get( + Extension(state): Extension, + Query(params): Query, +) -> Response { + use base64::engine::general_purpose::URL_SAFE_NO_PAD; + + let query_bytes = match URL_SAFE_NO_PAD.decode(¶ms.dns) { + Ok(b) => b, + Err(e) => { + warn!(error = %e, "invalid base64url in dns query param"); + return (StatusCode::BAD_REQUEST, "invalid base64url dns param").into_response(); + } + }; + + let query = match parse_query(&query_bytes) { + Ok(q) => q, + Err(e) => { + warn!(error = %e, "invalid DNS query from base64 param"); + return (StatusCode::BAD_REQUEST, "invalid DNS query").into_response(); + } + }; + + let qname = query + .queries() + .first() + .map(|q| q.name().to_string()) + .unwrap_or_default(); + let qtype = query + .queries() + .first() + .map(|q| q.query_type().to_string()) + .unwrap_or_default(); + + info!(query = %qname, qtype = %qtype, "received DoH GET query"); + + forward_and_respond(&state, &query_bytes, &query).await +} + +/// Forward a query to the upstream and build the response. +async fn forward_and_respond( + state: &AppState, + query_bytes: &[u8], + query: &hickory_proto::op::Message, +) -> Response { + // Pick upstream via round-robin + let idx = state + .rr_counter + .fetch_add(1, std::sync::atomic::Ordering::Relaxed); + + match state.doh_client.forward(query_bytes, idx).await { + Ok(response_bytes) => { + info!(bytes = response_bytes.len(), "forwarding upstream response"); + ( + StatusCode::OK, + [(header::CONTENT_TYPE, "application/dns-message")], + response_bytes, + ) + .into_response() + } + Err(e) => { + error!(error = %e, "upstream forward failed, returning SERVFAIL"); + match build_servfail(query) { + Ok(servfail) => ( + StatusCode::OK, + [(header::CONTENT_TYPE, "application/dns-message")], + servfail, + ) + .into_response(), + Err(e) => { + error!(error = %e, "failed to build SERVFAIL response"); + (StatusCode::INTERNAL_SERVER_ERROR, "internal error").into_response() + } + } + } + } +} diff --git a/src/upstream/doh_client.rs b/src/upstream/doh_client.rs new file mode 100644 index 0000000..94028b9 --- /dev/null +++ b/src/upstream/doh_client.rs @@ -0,0 +1,108 @@ +use reqwest::Client; +use tracing::{debug, warn}; + +use crate::config::ResolverEntry; + +/// Errors from the upstream DoH client. +#[derive(Debug, thiserror::Error)] +pub enum UpstreamError { + /// An HTTP-level error occurred. + #[error("HTTP error from upstream {name}: {source}")] + HttpError { + name: String, + source: reqwest::Error, + }, + /// The upstream returned a non-2xx status. + #[error("upstream {name} returned status {status}")] + BadStatus { name: String, status: u16 }, +} + +/// A DoH client that forwards DNS wire-format queries to upstream resolvers. +#[derive(Clone)] +pub struct DohClient { + http: Client, + resolvers: Vec, +} + +impl DohClient { + /// Create a new DoH client with the given upstream resolvers. + pub fn new(resolvers: Vec) -> Self { + let http = Client::builder() + .timeout(std::time::Duration::from_secs(10)) + .build() + .expect("failed to build HTTP client"); + Self { http, resolvers } + } + + /// Forward a DNS wire-format query to the upstream at the given index. + /// + /// Returns the raw DNS wire-format response bytes. + pub async fn forward( + &self, + query_bytes: &[u8], + resolver_index: usize, + ) -> Result, UpstreamError> { + let resolver = &self.resolvers[resolver_index % self.resolvers.len()]; + debug!(resolver = %resolver.name, url = %resolver.url, "forwarding query to upstream"); + + let response = self + .http + .post(&resolver.url) + .header("content-type", "application/dns-message") + .header("accept", "application/dns-message") + .body(query_bytes.to_vec()) + .send() + .await + .map_err(|e| UpstreamError::HttpError { + name: resolver.name.clone(), + source: e, + })?; + + let status = response.status(); + if !status.is_success() { + warn!(resolver = %resolver.name, status = %status, "upstream returned error status"); + return Err(UpstreamError::BadStatus { + name: resolver.name.clone(), + status: status.as_u16(), + }); + } + + let body = response + .bytes() + .await + .map_err(|e| UpstreamError::HttpError { + name: resolver.name.clone(), + source: e, + })?; + + debug!(resolver = %resolver.name, bytes = body.len(), "received upstream response"); + Ok(body.to_vec()) + } + + /// Return the number of configured resolvers. + #[allow(dead_code)] // Used by health/stats endpoints in M4 + pub fn resolver_count(&self) -> usize { + self.resolvers.len() + } +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn test_client_creation() { + let resolvers = vec![ + ResolverEntry { + name: "cloudflare".into(), + url: "https://cloudflare-dns.com/dns-query".into(), + }, + ResolverEntry { + name: "google".into(), + url: "https://dns.google/dns-query".into(), + }, + ]; + let client = DohClient::new(resolvers); + assert_eq!(client.resolver_count(), 2); + } +} diff --git a/src/upstream/mod.rs b/src/upstream/mod.rs new file mode 100644 index 0000000..51c3b2a --- /dev/null +++ b/src/upstream/mod.rs @@ -0,0 +1,3 @@ +//! Upstream DoH resolver client. + +pub mod doh_client; diff --git a/tests/integration.rs b/tests/integration.rs new file mode 100644 index 0000000..3b8227c --- /dev/null +++ b/tests/integration.rs @@ -0,0 +1,142 @@ +//! Integration tests for doh-forwarder. +//! +//! These tests spin up the full server on a random port and verify +//! the HTTP endpoints accept and forward DNS queries. + +use axum::body::Body; +use axum::http::{header, Request, StatusCode}; +use axum::routing::{get, post}; +use axum::{Extension, Router}; +use base64::Engine; +use hickory_proto::op::{Message, Query, ResponseCode}; +use hickory_proto::rr::{Name, RecordType}; +use std::sync::Arc; +use tokio::net::TcpListener; +use tower::ServiceExt; + +use doh_forwarder::routes::{dns_query_get, dns_query_post, AppState}; +use doh_forwarder::upstream::doh_client::DohClient; + +/// Build a minimal DNS query for the given domain and record type. +fn build_dns_query(name: &str, rtype: RecordType) -> Vec { + let mut msg = Message::new(); + msg.set_id(0x1234); + msg.set_recursion_desired(true); + msg.add_query(Query::query(Name::from_ascii(name).unwrap(), rtype)); + msg.to_vec().unwrap() +} + +/// Create a test AppState with a dummy resolver (will fail on forward, +/// but lets us test parsing/validation/health). +fn test_state() -> AppState { + let resolvers = vec![doh_forwarder::config::ResolverEntry { + name: "test".into(), + url: "http://127.0.0.1:1/dns-query".into(), // unreachable + }]; + AppState { + doh_client: DohClient::new(resolvers), + rr_counter: Arc::new(std::sync::atomic::AtomicUsize::new(0)), + } +} + +fn test_app() -> Router { + Router::new() + .route("/dns-query", post(dns_query_post).get(dns_query_get)) + .route("/health", get(|| async { "ok" })) + .layer(Extension(test_state())) +} + +#[tokio::test] +async fn test_health_endpoint() { + let app = test_app(); + let req = Request::builder() + .uri("/health") + .body(Body::empty()) + .unwrap(); + + let resp = app.oneshot(req).await.unwrap(); + assert_eq!(resp.status(), StatusCode::OK); + + let body = axum::body::to_bytes(resp.into_body(), usize::MAX) + .await + .unwrap(); + assert_eq!(body.as_ref(), b"ok"); +} + +#[tokio::test] +async fn test_dns_query_post_valid_query() { + let app = test_app(); + let query_bytes = build_dns_query("example.com.", RecordType::A); + + let req = Request::builder() + .method("POST") + .uri("/dns-query") + .header(header::CONTENT_TYPE, "application/dns-message") + .header(header::ACCEPT, "application/dns-message") + .body(Body::from(query_bytes)) + .unwrap(); + + let resp = app.oneshot(req).await.unwrap(); + // The upstream is unreachable, so we expect SERVFAIL (200 with DNS response) + assert_eq!(resp.status(), StatusCode::OK); + + let content_type = resp.headers().get(header::CONTENT_TYPE).unwrap(); + assert_eq!(content_type, "application/dns-message"); + + let body = axum::body::to_bytes(resp.into_body(), usize::MAX) + .await + .unwrap(); + let response_msg = Message::from_vec(&body).unwrap(); + assert_eq!(response_msg.id(), 0x1234); + assert_eq!(response_msg.response_code(), ResponseCode::ServFail); +} + +#[tokio::test] +async fn test_dns_query_post_invalid_body() { + let app = test_app(); + + let req = Request::builder() + .method("POST") + .uri("/dns-query") + .header(header::CONTENT_TYPE, "application/dns-message") + .body(Body::from(vec![0x00; 3])) // too short, invalid DNS + .unwrap(); + + let resp = app.oneshot(req).await.unwrap(); + assert_eq!(resp.status(), StatusCode::BAD_REQUEST); +} + +#[tokio::test] +async fn test_dns_query_get_valid_query() { + let app = test_app(); + let query_bytes = build_dns_query("example.com.", RecordType::A); + let encoded = base64::engine::general_purpose::URL_SAFE_NO_PAD.encode(&query_bytes); + + let req = Request::builder() + .uri(format!("/dns-query?dns={encoded}")) + .body(Body::empty()) + .unwrap(); + + let resp = app.oneshot(req).await.unwrap(); + assert_eq!(resp.status(), StatusCode::OK); + + let body = axum::body::to_bytes(resp.into_body(), usize::MAX) + .await + .unwrap(); + let response_msg = Message::from_vec(&body).unwrap(); + assert_eq!(response_msg.id(), 0x1234); + assert_eq!(response_msg.response_code(), ResponseCode::ServFail); +} + +#[tokio::test] +async fn test_dns_query_get_invalid_base64() { + let app = test_app(); + + let req = Request::builder() + .uri("/dns-query?dns=!!!invalid-base64!!!") + .body(Body::empty()) + .unwrap(); + + let resp = app.oneshot(req).await.unwrap(); + assert_eq!(resp.status(), StatusCode::BAD_REQUEST); +}