b6703b4315
* 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>
194 lines
4.5 KiB
HTML
194 lines
4.5 KiB
HTML
<!DOCTYPE html>
|
|
<html lang="en">
|
|
<head>
|
|
<meta charset="UTF-8">
|
|
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
|
<title>Blog — Numa</title>
|
|
<meta name="description" content="Technical writing about DNS, Rust, and building infrastructure from scratch.">
|
|
<link rel="stylesheet" href="/fonts/fonts.css">
|
|
<style>
|
|
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
|
|
|
|
:root {
|
|
--bg-deep: #f5f0e8;
|
|
--bg-surface: #ece5da;
|
|
--bg-card: #faf7f2;
|
|
--amber: #c0623a;
|
|
--amber-dim: #9e4e2d;
|
|
--teal: #6b7c4e;
|
|
--text-primary: #2c2418;
|
|
--text-secondary: #6b5e4f;
|
|
--text-dim: #a39888;
|
|
--border: rgba(0, 0, 0, 0.08);
|
|
--font-display: 'Instrument Serif', Georgia, serif;
|
|
--font-body: 'DM Sans', system-ui, sans-serif;
|
|
--font-mono: 'JetBrains Mono', monospace;
|
|
}
|
|
|
|
body {
|
|
background: var(--bg-deep);
|
|
color: var(--text-primary);
|
|
font-family: var(--font-body);
|
|
font-weight: 400;
|
|
line-height: 1.7;
|
|
-webkit-font-smoothing: antialiased;
|
|
}
|
|
|
|
body::before {
|
|
content: '';
|
|
position: fixed;
|
|
inset: 0;
|
|
background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.025'/%3E%3C/svg%3E");
|
|
pointer-events: none;
|
|
z-index: 9999;
|
|
}
|
|
|
|
.blog-nav {
|
|
padding: 1.5rem 2rem;
|
|
display: flex;
|
|
align-items: center;
|
|
gap: 1.5rem;
|
|
}
|
|
|
|
.blog-nav a {
|
|
font-family: var(--font-mono);
|
|
font-size: 0.75rem;
|
|
letter-spacing: 0.08em;
|
|
text-transform: uppercase;
|
|
color: var(--text-dim);
|
|
text-decoration: none;
|
|
transition: color 0.2s;
|
|
}
|
|
.blog-nav a:hover { color: var(--amber); }
|
|
|
|
.blog-nav .wordmark {
|
|
font-family: var(--font-display);
|
|
font-size: 1.4rem;
|
|
font-weight: 400;
|
|
color: var(--text-primary);
|
|
text-decoration: none;
|
|
letter-spacing: -0.02em;
|
|
}
|
|
.blog-nav .wordmark:hover { color: var(--amber); }
|
|
|
|
.blog-nav .sep {
|
|
color: var(--text-dim);
|
|
font-family: var(--font-mono);
|
|
font-size: 0.75rem;
|
|
}
|
|
|
|
.blog-index {
|
|
max-width: 720px;
|
|
margin: 0 auto;
|
|
padding: 3rem 2rem 6rem;
|
|
}
|
|
|
|
.blog-index h1 {
|
|
font-family: var(--font-display);
|
|
font-weight: 400;
|
|
font-size: 2.5rem;
|
|
margin-bottom: 3rem;
|
|
}
|
|
|
|
.post-list {
|
|
list-style: none;
|
|
}
|
|
|
|
.post-list li {
|
|
padding: 1.5rem 0;
|
|
border-bottom: 1px solid var(--border);
|
|
}
|
|
|
|
.post-list li:first-child {
|
|
border-top: 1px solid var(--border);
|
|
}
|
|
|
|
.post-list a {
|
|
text-decoration: none;
|
|
display: block;
|
|
}
|
|
|
|
.post-list .post-title {
|
|
font-family: var(--font-display);
|
|
font-size: 1.4rem;
|
|
font-weight: 600;
|
|
color: var(--text-primary);
|
|
line-height: 1.3;
|
|
margin-bottom: 0.4rem;
|
|
transition: color 0.2s;
|
|
}
|
|
|
|
.post-list a:hover .post-title {
|
|
color: var(--amber);
|
|
}
|
|
|
|
.post-list .post-desc {
|
|
font-size: 0.95rem;
|
|
color: var(--text-secondary);
|
|
line-height: 1.5;
|
|
margin-bottom: 0.4rem;
|
|
}
|
|
|
|
.post-list .post-date {
|
|
font-family: var(--font-mono);
|
|
font-size: 0.72rem;
|
|
color: var(--text-dim);
|
|
letter-spacing: 0.04em;
|
|
}
|
|
|
|
.blog-footer {
|
|
text-align: center;
|
|
padding: 3rem 2rem;
|
|
border-top: 1px solid var(--border);
|
|
max-width: 720px;
|
|
margin: 0 auto;
|
|
}
|
|
|
|
.blog-footer a {
|
|
font-family: var(--font-mono);
|
|
font-size: 0.75rem;
|
|
letter-spacing: 0.08em;
|
|
text-transform: uppercase;
|
|
color: var(--text-dim);
|
|
text-decoration: none;
|
|
margin: 0 1rem;
|
|
}
|
|
.blog-footer a:hover { color: var(--amber); }
|
|
</style>
|
|
</head>
|
|
<body>
|
|
|
|
<nav class="blog-nav">
|
|
<a href="/" class="wordmark">Numa</a>
|
|
<span class="sep">/</span>
|
|
<a href="/blog/">Blog</a>
|
|
</nav>
|
|
|
|
<main class="blog-index">
|
|
<h1>Blog</h1>
|
|
<ul class="post-list">
|
|
<li>
|
|
<a href="/blog/posts/dnssec-from-scratch.html">
|
|
<div class="post-title">Implementing DNSSEC from Scratch in Rust</div>
|
|
<div class="post-desc">Recursive resolution from root hints, chain-of-trust validation, NSEC/NSEC3 denial proofs, and what I learned implementing DNSSEC with zero DNS libraries.</div>
|
|
<div class="post-date">March 2026</div>
|
|
</a>
|
|
</li>
|
|
<li>
|
|
<a href="/blog/posts/dns-from-scratch.html">
|
|
<div class="post-title">I Built a DNS Resolver from Scratch in Rust</div>
|
|
<div class="post-desc">How DNS actually works at the wire level — label compression, TTL tricks, DoH implementation, and what I learned building a resolver with zero DNS libraries.</div>
|
|
<div class="post-date">March 2026</div>
|
|
</a>
|
|
</li>
|
|
</ul>
|
|
</main>
|
|
|
|
<footer class="blog-footer">
|
|
<a href="https://github.com/razvandimescu/numa">GitHub</a>
|
|
<a href="/">Home</a>
|
|
</footer>
|
|
|
|
</body>
|
|
</html>
|