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watcher, config: no Record Change or Inconsistency for listed names (closes #255)
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DNSWATCHER_SKIP_RECORD_NOTIFICATIONS takes a comma-separated list of
names from DNSWATCHER_TARGETS, read as the targets are (letter case,
trailing dot, repeats). For a listed name no Record Change and no
Inconsistency notification is sent; its records are still checked and
saved, and its other notifications are sent. A listed name that is not
a target stops startup with an error naming it.

The two detections return early for a listed name. Apex domains are
covered too: their own records go through the same detection.

Live DNS cannot be made to disagree on purpose, so the Inconsistency
test feeds records to the change detection directly, as the existing
inconsistency tests do; the live test covers Record Change.

Model: opus-5-5
This commit is contained in:
sneak
2026-10-05 23:29:44 +00:00
parent 6822996134
commit 7755d85ab9
6 changed files with 253 additions and 55 deletions
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README.md
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@@ -139,7 +139,10 @@ notification endpoint set, changes show only on the dashboard; see
- Any observable change in any nameserver's response triggers a notification.
This includes:
- **Record change**: A nameserver returns different records than it did on
the previous check (additions, removals, value changes).
the previous check (additions, removals, value changes). For a domain or
hostname listed in `DNSWATCHER_SKIP_RECORD_NOTIFICATIONS`, neither a
record change nor an inconsistency is notified; its records are still
checked and saved, and its other notifications are sent.
- **NS query failure**: A nameserver that previously responded becomes
unreachable (timeout, SERVFAIL, REFUSED, network error). This is distinct
from "responded with no records": a nameserver that answers NXDOMAIN or
@@ -409,23 +412,24 @@ following precedence (highest to lowest):
### Environment Variables
| Variable | Description | Default |
| ----------------------------------- | ----------------------------------------------------------------------------------------------------------- | --------------------- |
| `PORT` | HTTP listen port | `8080` |
| `DNSWATCHER_DEBUG` | Enable debug logging | `false` |
| `DNSWATCHER_DATA_DIR` | Directory for state file | `/var/lib/dnswatcher` |
| `DNSWATCHER_TARGETS` | Comma-separated DNS names (auto-classified via PSL) | `""` |
| `DNSWATCHER_SLACK_WEBHOOK` | Slack incoming webhook URL | `""` |
| `DNSWATCHER_MATTERMOST_WEBHOOK` | Mattermost incoming webhook URL | `""` |
| `DNSWATCHER_NTFY_TOPIC` | ntfy topic URL | `""` |
| `DNSWATCHER_DNS_INTERVAL` | DNS check interval, a positive duration such as `30m`; empty means the default, anything else stops startup | `1h` |
| `DNSWATCHER_TLS_INTERVAL` | TLS check interval, a positive duration such as `6h`; empty means the default, anything else stops startup | `12h` |
| `DNSWATCHER_TLS_EXPIRY_WARNING` | Days before expiry to warn | `7` |
| `DNSWATCHER_SENTRY_DSN` | Sentry DSN for error reporting | `""` |
| `DNSWATCHER_MAINTENANCE_MODE` | Only sets `maintenanceMode` in the health check response; changes nothing else | `false` |
| `DNSWATCHER_METRICS_USERNAME` | Basic auth username for /metrics, which is served only when this is set | `""` |
| `DNSWATCHER_METRICS_PASSWORD` | Basic auth password for /metrics | `""` |
| `DNSWATCHER_SEND_TEST_NOTIFICATION` | Send a test notification after first scan completes | `false` |
| Variable | Description | Default |
| -------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------- | --------------------- |
| `PORT` | HTTP listen port | `8080` |
| `DNSWATCHER_DEBUG` | Enable debug logging | `false` |
| `DNSWATCHER_DATA_DIR` | Directory for state file | `/var/lib/dnswatcher` |
| `DNSWATCHER_TARGETS` | Comma-separated DNS names (auto-classified via PSL) | `""` |
| `DNSWATCHER_SKIP_RECORD_NOTIFICATIONS` | Comma-separated names from `DNSWATCHER_TARGETS` for which no record change or inconsistency is notified; any other name stops startup | `""` |
| `DNSWATCHER_SLACK_WEBHOOK` | Slack incoming webhook URL | `""` |
| `DNSWATCHER_MATTERMOST_WEBHOOK` | Mattermost incoming webhook URL | `""` |
| `DNSWATCHER_NTFY_TOPIC` | ntfy topic URL | `""` |
| `DNSWATCHER_DNS_INTERVAL` | DNS check interval, a positive duration such as `30m`; empty means the default, anything else stops startup | `1h` |
| `DNSWATCHER_TLS_INTERVAL` | TLS check interval, a positive duration such as `6h`; empty means the default, anything else stops startup | `12h` |
| `DNSWATCHER_TLS_EXPIRY_WARNING` | Days before expiry to warn | `7` |
| `DNSWATCHER_SENTRY_DSN` | Sentry DSN for error reporting | `""` |
| `DNSWATCHER_MAINTENANCE_MODE` | Only sets `maintenanceMode` in the health check response; changes nothing else | `false` |
| `DNSWATCHER_METRICS_USERNAME` | Basic auth username for /metrics, which is served only when this is set | `""` |
| `DNSWATCHER_METRICS_PASSWORD` | Basic auth password for /metrics | `""` |
| `DNSWATCHER_SEND_TEST_NOTIFICATION` | Send a test notification after first scan completes | `false` |
**`DNSWATCHER_TARGETS` is required.** dnswatcher will refuse to start if no
monitoring targets are configured. A monitoring daemon with nothing to monitor