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resolver: take a domain's NS set from its delegation (closes #200 )

A domain's NS set was taken from whichever of its own servers answered
first, so when they disagree (during a move between DNS providers, or
with a stale secondary) the set could change between checks and send an
NS change notification with nothing changed. The walk now stops at the
referral to the domain from its parent zone's servers and returns that
delegation, which those servers all hold alike; the domain's own
servers are no longer asked for it. The NS records in an answer are
still used where no such referral comes first, as from a server that
holds both the parent zone and the domain. Hostnames get their zone's
servers the same way.

Model: opus-5-5

2026-10-01 23:28:57 +00:00

7.8 KiB

Raw Blame History

Workflow

branch (from next)
do the work in Next Step
move Next Step to the top of Completed Steps
move the top item of Future Steps into Next Step
commit (TODO.md changes in the same commit as the work)
push
open a PR against next

Status

pre-1.0. No git tags. Work lands on next by PR. Open work for 1.0 is tracked on the 1.0 milestone: https://git.eeqj.de/sneak/dnswatcher/milestone/7

Next Step

trial run of the finished image: #149

Completed Steps

2026-10-01: a domain's NS set is its delegation from the parent zone's servers, not whichever of its own servers answered first (closes #200).
2026-10-01: README has Getting Started, Rationale and TODO sections, and its Architecture section is now Design, in the order policy sets (closes #173).
2026-10-01: a zone's server that answers SERVFAIL or a referral leading no closer is passed over for the next, as one that times out is (closes #197).
2026-10-01: when none of a configured name's nameservers answered, the port state saved for its addresses is kept, not removed (closes #193).
2026-10-01: ResolveIPAddresses returns an error, not no addresses, when no nameserver of the name's zone answered (closes #190).
2026-10-01: make fmt and make fmt-check cover Markdown with prettier, run in Docker at the version pinned by yarn.lock (closes #119).
2026-10-01: make fmt-check fails on a file goimports would change; both format scripts run goimports at its pinned commit, not from PATH (#119).
2026-10-01: a hostname is queried at the servers of the zone it is in, found by following delegations for the name, not its last two labels (closes #189).
2026-10-01: each nameserver's addresses are saved with its domain, and a change while it stays in the delegation is notified (closes #105).
2026-10-01: the watcher saves state when it stops, and shutdown waits for that save, so it no longer relies on the state's own stop hook (closes #114).
2026-10-01: DNSWATCHER_SENTRY_DSN reports panics in HTTP handlers to Sentry, and a DSN Sentry cannot parse stops startup (closes #107).
2026-10-01: a port or TLS check that shutdown cuts short saves nothing and sends no notification, as a cut-short DNS lookup already did (closes #185).
2026-10-01: the client address from X-Forwarded-For is the last entry that is not a trusted proxy, not the first, which the client sets (closes #181).
2026-10-01: a nameserver that does not answer is saved as error with the reason, and NS failure and NS recovery are notified (closes #104).
2026-10-01: a DNSWATCHER_DNS_INTERVAL or DNSWATCHER_TLS_INTERVAL that is not a positive duration stops startup; empty means the default (closes #177).
2026-10-01: /metrics allows each client address 30 requests a minute, counted before Basic Auth, and answers 429 beyond that (closes #101).
2026-10-01: the image built by make docker reports the git describe version, not dev, and the startup log now shows it (closes #109).
2026-10-01: two notify shutdown tests always release the delivery they hold, so a drain that returns early fails them instead of hanging (closes #176).
2026-10-01: script/install-precommit asks git for the repository's git directory, so make hooks also works where .git is a file (closes #129).
2026-10-01: TODO.md brought up to date: open issues listed by URL, every Completed Steps entry cut to at most two lines (closes #146).
2026-10-01: wildcard CORS now applies only to the public routes, not to /metrics, and allows only the methods they serve (closes #100).
2026-10-01: internal/state and internal/watcher no longer export test-only constructors: two moved to export_test.go, one is deleted (closes #111).
2026-10-01: notify shutdown tests use one timing constant per meaning, name the bound they check, and require the drain's debug line (closes #116).
2026-09-29: the entrypoint chowns the data directory to dnswatcher and runs dnswatcher as that user, so a host bind mount needs no chown (closes #166).
2026-09-29: the live-DNS test package is renamed internal/livednstest; make lint fails when program code imports it (closes #164).
2026-09-29: .golangci.yml re-fetched from sneak/prompts, with gomodguard_v2 and the org depguard test-support rule (closes #123).
2026-09-29: watcher and resolver tests that look something up in DNS use the real resolver against live DNS servers (closes #159).
2026-09-28: the inconsistency alert is sent once, when two nameservers start to disagree; every pair of nameservers is compared (closes #158).
2026-09-28: DNS names in record values (CNAME, MX, SRV and NS targets) are lower-cased, so letter case alone is not a change (closes #157).
2026-09-28: lint and tests run on every build: script/cibuild and script/docker pass --no-cache-filter=lint,builder (closes #115).
2026-09-28: the server timeout test drives Run and checks the timeouts on the http.Server it serves (closes #120).
2026-09-28: upaas deploy readiness: the image runs as user dnswatcher with a HEALTHCHECK; README "Running under upaas" (closes #147).
2026-09-21: added behavioural tests for internal/globals, internal/healthcheck, and internal/logger (closes #110).
2026-09-21: go mod tidy dropped the redundant golang.org/x/sync // indirect line so script/bootstrap leaves a clean tree (#132)
2026-08-10: comment-only corrections to script/bootstrap, script/cibuild and Dockerfile.lint; no behaviour changed.
2026-08-10: MIT LICENSE added at the repository root; the README's first line and License section name the licence.
2026-08-10: policy scaffold present: REPO_POLICIES.md, .editorconfig, .dockerignore, CI workflow, make fmt-check, make docker, make hooks.
2026-08-10: Go's test cache disabled in script/test (-count=1), so every run queries live DNS; a failed run is rerun with -v.
2026-08-10: live-DNS tests made robust rather than gated (#93): a limit on concurrent lookups, retries, and a quorum across nameservers.
2026-08-10: all linting moved into Docker: script/lint builds Dockerfile.lint, and the root Dockerfile has its own lint stage.
2026-08-09: in-flight notification deliveries are drained at shutdown, bounded by the shutdown deadline (#106).
2026-08-09: http.Server sets all four socket timeouts; WriteTimeout stays above the 60s handler timeout (#99).
2026-08-09: SecurityHeaders() middleware sets HSTS, CSP and the other security headers REPO_POLICIES.md requires on every response.
2026-08-07: golangci-lint bumped to v2.12.2 and .golangci.yml set to the org config; fixed the resulting goconst, dupl and lll findings.
2026-07-07 Adopted scripts-to-rule-them-all: script/ entrypoints, Makefile shims, README Entrypoints section
2026-02-20: iterative DNS resolver implemented
2026-02-20: CI actions and go install refs pinned to commit SHAs; Gitea Actions workflow added
2026-02-20: watcher monitoring orchestrator merged to main (#8)
2026-02-20: DOMAINS/HOSTNAMES unified into single TARGETS config (#11)
2026-02-19: TCP port connectivity checker, made concurrent with port validation; gosec G704 SSRF findings fixed without suppression
2026-02-19: TLS certificate inspector with no-peer-certificates error path and IP SANs
2026-02-19: gosec SSRF and formatting fixes on main
2026-02-19: initial scaffold with per-nameserver DNS monitoring model

Future Steps

1.0 readiness: run it with a real config and read the logs: #66
README accuracy sweep: #108
fixed root server order: #138
review toward 1.0: #144