103 lines
3.7 KiB
Markdown
103 lines
3.7 KiB
Markdown
# DNS Server Interface Binding Implementation Plan
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Command to reread CLAUDE.md: `cat /home/philkunz/.claude/CLAUDE.md`
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## Overview ✅ COMPLETED
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Enable specific interface binding for the DNSServer class to allow binding to specific network interfaces instead of all interfaces (0.0.0.0).
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## Implementation Status: COMPLETED ✅
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### What was implemented:
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✅ **1. Updated IDnsServerOptions Interface**
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- Added optional `udpBindInterface?: string` property (defaults to '0.0.0.0')
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- Added optional `httpsBindInterface?: string` property (defaults to '0.0.0.0')
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- Located in `ts_server/classes.dnsserver.ts:5-11`
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✅ **2. Modified DnsServer.start() Method**
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- Updated UDP server binding to use `this.options.udpBindInterface || '0.0.0.0'`
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- Updated HTTPS server listening to use `this.options.httpsBindInterface || '0.0.0.0'`
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- Added IP address validation before binding
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- Updated console logging to show specific interface being bound
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- Located in `ts_server/classes.dnsserver.ts:699-752`
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✅ **3. Added IP Address Validation**
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- Created `isValidIpAddress()` method supporting IPv4 and IPv6
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- Validates interface addresses before binding
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- Throws meaningful error messages for invalid addresses
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- Located in `ts_server/classes.dnsserver.ts:392-398`
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✅ **4. Updated Documentation**
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- Added dedicated "Interface Binding" section to readme.md
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- Included examples for localhost-only binding (`127.0.0.1`, `::1`)
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- Documented security considerations and use cases
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- Added examples for specific interface binding
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✅ **5. Added Comprehensive Tests**
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- **localhost binding test**: Verifies binding to `127.0.0.1` instead of `0.0.0.0`
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- **Invalid IP validation test**: Ensures invalid IP addresses are rejected
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- **IPv6 support test**: Tests `::1` binding (with graceful fallback if IPv6 unavailable)
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- **Backwards compatibility**: Existing tests continue to work with default behavior
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- Located in `test/test.server.ts`
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✅ **6. Updated restartHttpsServer Method**
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- Modified to respect interface binding options during certificate updates
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- Ensures Let's Encrypt certificate renewal maintains interface binding
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## ✅ Implementation Results
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### Test Results
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All interface binding functionality has been successfully tested:
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```bash
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✅ should bind to localhost interface only (318ms)
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- UDP DNS server running on 127.0.0.1:8085
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- HTTPS DNS server running on 127.0.0.1:8084
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✅ should reject invalid IP addresses (151ms)
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- Validates IP address format correctly
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- Throws meaningful error messages
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✅ should work with IPv6 localhost if available
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- Gracefully handles IPv6 unavailability in containerized environments
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```
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### Benefits Achieved
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- ✅ Enhanced security by allowing localhost-only binding
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- ✅ Support for multi-homed servers with specific interface requirements
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- ✅ Better isolation in containerized environments
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- ✅ Backwards compatible (defaults to current behavior)
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- ✅ IP address validation with clear error messages
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- ✅ IPv4 and IPv6 support
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## Example Usage (Now Available)
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```typescript
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// Bind to localhost only
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const dnsServer = new DnsServer({
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httpsKey: cert.key,
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httpsCert: cert.cert,
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httpsPort: 443,
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udpPort: 53,
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dnssecZone: 'example.com',
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udpBindInterface: '127.0.0.1',
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httpsBindInterface: '127.0.0.1'
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});
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// Bind to specific interface
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const dnsServer = new DnsServer({
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// ... other options
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udpBindInterface: '192.168.1.100',
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httpsBindInterface: '192.168.1.100'
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});
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```
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## Files to Modify
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1. `ts_server/classes.dnsserver.ts` - Interface and implementation
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2. `readme.md` - Documentation updates
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3. `test/test.server.ts` - Add interface binding tests
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## Testing Strategy
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- Unit tests for interface validation
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- Integration tests for binding behavior
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- Error handling tests for invalid interfaces
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- Backwards compatibility tests |