SmartDNS Improvement Plan

Command to reread CLAUDE.md: cat /home/philkunz/.claude/CLAUDE.md

Critical Issue: Support Multiple DNS Records of Same Type

Current Status: Planning

Priority: HIGH - This issue blocks proper DNS server operation and domain registration

Problem Summary

The DNS server currently exits after finding the first matching handler for a query, preventing it from serving multiple records of the same type (e.g., multiple NS records, multiple A records for round-robin, multiple TXT records).

Implementation Plan

Phase 1: Analysis and Testing ✅ COMPLETED

Create comprehensive test cases demonstrating the issue
Test with multiple NS records scenario
Test with multiple A records (round-robin) scenario
Test with multiple TXT records scenario
Document current behavior vs expected behavior

Phase 2: Core Fix Implementation ✅ COMPLETED

Remove the break statement in processDnsRequest method (line 609)
Ensure all matching handlers are processed
Accumulate all answers from matching handlers
Add NS record serialization for DNSSEC support

Phase 3: Handler Interface Enhancement (Optional)

Consider allowing handlers to return arrays of records
Update IDnsHandler interface to support DnsAnswer | DnsAnswer[] | null
Update processing logic to handle array responses
Maintain backward compatibility with existing handlers

Phase 4: Testing and Validation

Test multiple NS records return correctly
Test round-robin DNS with multiple A records
Test multiple TXT records (SPF + DKIM + verification)
Test DNSSEC signatures for multiple records
Verify no regression in single-record scenarios

Phase 5: Documentation and Examples

Update documentation with multiple record examples
Add example for registering multiple NS records
Add example for round-robin DNS setup
Document best practices for handler registration

Technical Details

Current Code Issue (ts_server/classes.dnsserver.ts:609)

answered = true;
break; // <-- This prevents multiple handlers from contributing answers

Proposed Fix

answered = true;
// Continue processing other handlers instead of breaking

Success Criteria

DNS queries return ALL matching records from ALL matching handlers
Domain registration with multiple NS records succeeds
Round-robin DNS works with multiple A records
Multiple TXT records can be served for the same domain
DNSSEC signatures are properly generated for all returned records

Implementation Summary

What Was Fixed

Core Issue Resolved: Removed the break statement at line 609 in processDnsRequest that was preventing multiple handlers from contributing DNS answers
NS Record Serialization: Added NS record type support in serializeRData method for DNSSEC compatibility
Result: DNS server now correctly returns multiple records of the same type from different handlers

Test Results

✅ Multiple NS records now work (2+ nameservers returned)
✅ Round-robin DNS with multiple A records works
✅ Multiple TXT records (SPF, DKIM, verification) work
⚠️ DNSSEC RRSIG generation needs additional fixes for multiple record scenarios

Code Changes

// Before (line 609):
answered = true;
break;  // This was preventing multiple handlers from running

// After:
answered = true;
// Continue processing other handlers to allow multiple records

Additional Improvements to Consider

Fix DNSSEC RRSIG generation for multiple records
Fix SOA record timeout issues
Make DNSSEC zone prefix configurable (remove hardcoded 'ns1.')
Improve error handling for edge cases
Consider handler interface enhancement to return arrays

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