5b2cc874a1
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>
194 lines
4.5 KiB
HTML
194 lines
4.5 KiB
HTML
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<a href="/blog/dnssec-from-scratch.html">
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<div class="post-title">Implementing DNSSEC from Scratch in Rust</div>
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<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>
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<div class="post-date">March 2026</div>
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<a href="/blog/dns-from-scratch.html">
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<div class="post-title">I Built a DNS Resolver from Scratch in Rust</div>
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<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>
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<div class="post-date">March 2026</div>
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