feat: recursive DNS + DNSSEC + TCP fallback (#17)
* feat: recursive resolution + full DNSSEC validation Numa becomes a true DNS resolver — resolves from root nameservers with complete DNSSEC chain-of-trust verification. Recursive resolution: - Iterative RFC 1034 from configurable root hints (13 default) - CNAME chasing (depth 8), referral following (depth 10) - A+AAAA glue extraction, IPv6 nameserver support - TLD priming: NS + DS + DNSKEY for 34 gTLDs + EU ccTLDs - Config: mode = "recursive" in [upstream], root_hints, prime_tlds DNSSEC (all 4 phases): - EDNS0 OPT pseudo-record (DO bit, 1232 payload per DNS Flag Day 2020) - DNSKEY, DS, RRSIG, NSEC, NSEC3 record types with wire read/write - Signature verification via ring: RSA/SHA-256, ECDSA P-256, Ed25519 - Chain-of-trust: zone DNSKEY → parent DS → root KSK (key tag 20326) - DNSKEY RRset self-signature verification (RRSIG(DNSKEY) by KSK) - RRSIG expiration/inception time validation - NSEC: NXDOMAIN gap proofs, NODATA type absence, wildcard denial - NSEC3: SHA-1 iterated hashing, closest encloser proof, hash range - Authority RRSIG verification for denial proofs - Config: [dnssec] enabled/strict (default false, opt-in) - AD bit on Secure, SERVFAIL on Bogus+strict - DnssecStatus cached per entry, ValidationStats logging Performance: - TLD chain pre-warmed on startup (root DNSKEY + TLD DS/DNSKEY) - Referral DS piggybacking from authority sections - DNSKEY prefetch before validation loop - Cold-cache validation: ~1 DNSKEY fetch (down from 5) - Benchmarks: RSA 10.9µs, ECDSA 174ns, DS verify 257ns Also: - write_qname fix for root domain "." (was producing malformed queries) - write_record_header() dedup, write_bytes() bulk writes - DnsRecord::domain() + query_type() accessors - UpstreamMode enum, DEFAULT_EDNS_PAYLOAD const - Real glue TTL (was hardcoded 3600) - DNSSEC restricted to recursive mode only Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * feat: TCP fallback, query minimization, UDP auto-disable Transport resilience for restrictive networks (ISPs blocking UDP:53): - DNS-over-TCP fallback: UDP fail/truncation → automatic TCP retry - UDP auto-disable: after 3 consecutive failures, switch to TCP-first - IPv6 → TCP directly (UDP socket binds 0.0.0.0, can't reach IPv6) - Network change resets UDP detection for re-probing - Root hint rotation in TLD priming Privacy: - RFC 7816 query minimization: root servers see TLD only, not full name Code quality: - Merged find_starting_ns + find_starting_zone → find_closest_ns - Extracted resolve_ns_addrs_from_glue shared helper - Removed overall timeout wrapper (per-hop timeouts sufficient) - forward_tcp for DNS-over-TCP (RFC 1035 §4.2.2) Testing: - Mock TCP-only DNS server for fallback tests (no network needed) - tcp_fallback_resolves_when_udp_blocked - tcp_only_iterative_resolution - tcp_fallback_handles_nxdomain - udp_auto_disable_resets - Integration test suite (4 suites, 51 tests) - Network probe script (tests/network-probe.sh) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * feat: DNSSEC verified badge in dashboard query log - Add dnssec field to QueryLogEntry, track validation status per query - DnssecStatus::as_str() for API serialization - Dashboard shows green checkmark next to DNSSEC-verified responses - Blog post: add "How keys get there" section, transport resilience section, trim code blocks, update What's Next Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * fix: use SVG shield for DNSSEC badge, update blog HTML Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * fix: NS cache lookup from authorities, UDP re-probe, shield alignment - find_closest_ns checks authorities (not just answers) for NS records, fixing TLD priming cache misses that caused redundant root queries - Periodic UDP re-probe every 5min when disabled — re-enables UDP after switching from a restrictive network to an open one - Dashboard DNSSEC shield uses fixed-width container for alignment - Blog post: tuck key-tag into trust anchor paragraph Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * fix: TCP single-write, mock server consistency, integration tests - TCP single-write fix: combine length prefix + message to avoid split segments that Microsoft/Azure DNS servers reject - Mock server (spawn_tcp_dns_server) updated to use single-write too - Tests: forward_tcp_wire_format, forward_tcp_single_segment_write - Integration: real-server checks for Microsoft/Office/Azure domains Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * feat: recursive bar in dashboard, special-use domain interception Dashboard: - Add Recursive bar to resolution paths chart (cyan, distinct from Override) - Add RECURSIVE path tag style in query log Special-use domains (RFC 6761/6303/8880/9462): - .localhost → 127.0.0.1 (RFC 6761) - Private reverse PTR (10.x, 192.168.x, 172.16-31.x) → NXDOMAIN - _dns.resolver.arpa (DDR) → NXDOMAIN - ipv4only.arpa (NAT64) → 192.0.0.170/171 - mDNS service discovery for private ranges → NXDOMAIN Eliminates ~900ms SERVFAILs for macOS system queries that were hitting root servers unnecessarily. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * chore: move generated blog HTML to site/blog/posts/, gitignore - Generated HTML now in site/blog/posts/ (gitignored) - CI workflow runs pandoc + make blog before deploy - Updated all internal blog links to /blog/posts/ path - blog/*.md remains the source of truth Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * fix: review feedback — memory ordering, RRSIG time, NS resolution - Ordering::Relaxed → Acquire/Release for UDP_DISABLED/UDP_FAILURES (ARM correctness for cross-thread coordination) - RRSIG time validation: serial number arithmetic (RFC 4034 §3.1.5) + 300s clock skew fudge factor (matches BIND) - resolve_ns_addrs_from_glue collects addresses from ALL NS names, not just the first with glue (improves failover) - is_special_use_domain: eliminate 16 format! allocations per .in-addr.arpa query (parse octet instead) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * feat: API endpoint tests, coverage target - 8 new axum handler tests: health, stats, query-log, overrides CRUD, cache, blocking stats, services CRUD, dashboard HTML - Tests use tower::oneshot — no network, no server startup - test_ctx() builds minimal ServerCtx for isolated testing - `make coverage` target (cargo-tarpaulin), separate from `make all` - 82 total tests (was 74) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Razvan Dimescu
@@ -4,16 +4,22 @@ use crate::Result;
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#[derive(PartialEq, Eq, Debug, Clone, Hash, Copy)]
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pub enum QueryType {
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UNKNOWN(u16),
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A, // 1
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NS, // 2
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CNAME, // 5
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SOA, // 6
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PTR, // 12
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MX, // 15
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TXT, // 16
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AAAA, // 28
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SRV, // 33
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HTTPS, // 65
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A, // 1
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NS, // 2
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CNAME, // 5
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SOA, // 6
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PTR, // 12
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MX, // 15
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TXT, // 16
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AAAA, // 28
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SRV, // 33
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DS, // 43
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RRSIG, // 46
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NSEC, // 47
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DNSKEY, // 48
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NSEC3, // 50
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OPT, // 41 (EDNS0 pseudo-type)
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HTTPS, // 65
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}
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impl QueryType {
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@@ -29,6 +35,12 @@ impl QueryType {
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QueryType::TXT => 16,
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QueryType::AAAA => 28,
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QueryType::SRV => 33,
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QueryType::OPT => 41,
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QueryType::DS => 43,
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QueryType::RRSIG => 46,
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QueryType::NSEC => 47,
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QueryType::DNSKEY => 48,
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QueryType::NSEC3 => 50,
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QueryType::HTTPS => 65,
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}
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}
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@@ -44,6 +56,12 @@ impl QueryType {
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16 => QueryType::TXT,
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28 => QueryType::AAAA,
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33 => QueryType::SRV,
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41 => QueryType::OPT,
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43 => QueryType::DS,
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46 => QueryType::RRSIG,
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47 => QueryType::NSEC,
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48 => QueryType::DNSKEY,
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50 => QueryType::NSEC3,
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65 => QueryType::HTTPS,
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_ => QueryType::UNKNOWN(num),
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}
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@@ -60,6 +78,12 @@ impl QueryType {
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QueryType::TXT => "TXT",
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QueryType::AAAA => "AAAA",
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QueryType::SRV => "SRV",
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QueryType::OPT => "OPT",
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QueryType::DS => "DS",
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QueryType::RRSIG => "RRSIG",
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QueryType::NSEC => "NSEC",
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QueryType::DNSKEY => "DNSKEY",
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QueryType::NSEC3 => "NSEC3",
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QueryType::HTTPS => "HTTPS",
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QueryType::UNKNOWN(_) => "UNKNOWN",
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}
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@@ -76,6 +100,11 @@ impl QueryType {
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"TXT" => Some(QueryType::TXT),
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"AAAA" => Some(QueryType::AAAA),
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"SRV" => Some(QueryType::SRV),
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"DS" => Some(QueryType::DS),
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"RRSIG" => Some(QueryType::RRSIG),
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"DNSKEY" => Some(QueryType::DNSKEY),
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"NSEC" => Some(QueryType::NSEC),
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"NSEC3" => Some(QueryType::NSEC3),
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"HTTPS" => Some(QueryType::HTTPS),
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_ => None,
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}
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