No Data App

A DNS App for Technitium DNS Server that returns NOERROR / NODATA for selected query types using APP record data.

Overview

• APP-record driven – no root-level dnsApp.config keys
• Blocked query types – driven by blockedTypes in APP record JSON
• NODATA responses – returns NOERROR with an empty answer section

Integration / extension points

• Implements: IDnsApplication, IDnsAppRecordRequestHandler
• Runs as an APP-record request handler.

Configuration

dnsApp.config is not used by this app.

APP record JSON

Example

{
  "blockedTypes": ["A", "AAAA", "ANY"]
}

Runtime behavior

1. The query name must match the APP record name, unless the APP record name is a wildcard.
2. The app parses appRecordData as JSON.
3. If the question type is in blockedTypes, or ANY is present, the app returns NOERROR with no answers.
4. Otherwise, it returns no response and the query continues through normal resolution.

Risks / operational notes

• NODATA can be cached negatively by clients and recursive resolvers.
• This app suppresses responses for selected types; use carefully if clients expect those records.

Troubleshooting

• Confirm the APP record data contains valid JSON.
• Confirm blockedTypes includes the requested type.
• Confirm the query name matches the APP record name or wildcard rule.