Razvan Dimescu 241c40553b feat(odoh): ship ODoH client + self-hosted relay (RFC 9230) ...

Client (mode = "odoh"): URL-query target routing per RFC 9230 §5,
/.well-known/odohconfigs TTL cache with 60s backoff on failure, HPKE
seal/open via odoh-rs, strict-mode default that SERVFAILs on relay
failure instead of silently downgrading. Host-equality config
validation rejects same-operator relay/target pairs.

Relay (`numa relay [PORT]`): axum server with /relay + /health.
SSRF-hardened hostname validator (RFC 1035 ASCII + dot + dash),
4 KiB body cap at the axum layer, 5s full-transaction timeout, and
static 502 on target failure (reqwest internals logged, not leaked).
Aggregate counters only — no per-request logs.

Observability: new `UpstreamTransport { Udp, Doh, Dot, Odoh }`
orthogonal to `QueryPath`, so /stats can tally wire protocols
symmetrically. Recursive mode records `Some(Udp)` for honest
"bytes egressing in cleartext" accounting.

Tests: Suite 8 exercises the client end-to-end via Frank Denis's
public relay + Cloudflare target; Suite 9 exercises `numa relay`
forwarding + guards against Cloudflare as the real far end. Full
probe script at tests/probe-odoh-ecosystem.sh verifies the entire
public ODoH ecosystem (4 targets + 1 relay per DNSCrypt's curated
list — confirms deploying Numa's relay doubles global supply).

2026-04-20 12:34:04 +03:00

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