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Sean WhalenandClaude Fable 5
cd864f4cfc
Each entry in the existing nameservers option now selects its own transport (#880): an IP address means plain DNS on port 53 exactly as before, an https:// URL means DoH, and tls://ip[:port][#hostname] means DoT, with the optional #hostname naming the TLS certificate identity (systemd-resolved syntax). Forms can be mixed in one list, and no new configuration option is involved. DoH queries go through a shared per-process httpx client passed to dns.query.https as session=, which is what makes them honor HTTP_PROXY/ HTTPS_PROXY/NO_PROXY and SSL_CERT_FILE — the motivating proxy-only corporate network case. dnspython's stock DoH path cannot do this: it builds its httpx client around a custom transport, and httpx only reads proxy environment variables when no transport is supplied (allow_env_proxies = trust_env and transport is None). The client is rebuilt when the PID changes so fork-based worker pools never share a parent's sockets. The dnspython requirement becomes dnspython[doh]>=2.7.0 — the extra supplies the httpx/h2 floors DoH needs, and 2.7.0 is the floor verified against the dns.nameserver and dns.query.https(session=...) APIs used. The startup DNS pre-flight check now exercises whichever transports are configured, so a malformed DoH/DoT entry raises ConfigurationError before any mailbox work begins. Malformed tls:// entries — including the plausible slash-for-# typo tls://9.9.9.9/dns.quad9.net, which would otherwise silently drop the certificate identity — are rejected at configuration time naming the entry. Verified live: DoH A/PTR queries against Cloudflare and DoT against Quad9 (tls://9.9.9.9#dns.quad9.net), plus a full CLI run over a sample report with encrypted-DNS-only nameservers. Co-authored-by: Claude Fable 5 <noreply@anthropic.com>