mirror of
https://github.com/fosrl/olm.git
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Owen
@@ -1,263 +0,0 @@
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# DNS Platform Module
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A standalone Go module for managing system DNS settings across different platforms and DNS management systems.
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## Overview
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This module provides a unified interface for overriding system DNS servers on:
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- **macOS**: Using `scutil`
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- **Windows**: Using Windows Registry
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- **Linux/FreeBSD**: Supporting multiple backends:
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- systemd-resolved (D-Bus)
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- NetworkManager (D-Bus)
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- resolvconf utility
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- Direct `/etc/resolv.conf` manipulation
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## Features
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- ✅ Cross-platform DNS override
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- ✅ Automatic detection of best DNS management method
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- ✅ Backup and restore original DNS settings
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- ✅ Platform-specific optimizations
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- ✅ No external dependencies for basic functionality
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## Architecture
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### Interface
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All configurators implement the `DNSConfigurator` interface:
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```go
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type DNSConfigurator interface {
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SetDNS(servers []netip.Addr) ([]netip.Addr, error)
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RestoreDNS() error
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GetCurrentDNS() ([]netip.Addr, error)
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Name() string
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}
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```
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### Platform-Specific Implementations
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Each platform has dedicated structs instead of using build tags at the file level:
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- `DarwinDNSConfigurator` - macOS using scutil
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- `WindowsDNSConfigurator` - Windows using registry
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- `FileDNSConfigurator` - Unix using /etc/resolv.conf
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- `SystemdResolvedDNSConfigurator` - Linux using systemd-resolved
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- `NetworkManagerDNSConfigurator` - Linux using NetworkManager
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- `ResolvconfDNSConfigurator` - Linux using resolvconf utility
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## Usage
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### Automatic Detection
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```go
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import "github.com/your-org/olm/dns/platform"
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// On Linux/Unix - provide interface name for best results
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configurator, err := platform.DetectBestConfigurator("eth0")
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if err != nil {
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log.Fatal(err)
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}
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// Set DNS servers
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originalServers, err := configurator.SetDNS([]netip.Addr{
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netip.MustParseAddr("8.8.8.8"),
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netip.MustParseAddr("8.8.4.4"),
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})
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if err != nil {
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log.Fatal(err)
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}
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// Restore original DNS
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defer configurator.RestoreDNS()
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```
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### Manual Selection
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```go
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// Linux - Direct file manipulation
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configurator, err := platform.NewFileDNSConfigurator()
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// Linux - systemd-resolved
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configurator, err := platform.NewSystemdResolvedDNSConfigurator("eth0")
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// Linux - NetworkManager
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configurator, err := platform.NewNetworkManagerDNSConfigurator("eth0")
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// Linux - resolvconf
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configurator, err := platform.NewResolvconfDNSConfigurator("eth0")
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// macOS
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configurator, err := platform.NewDarwinDNSConfigurator()
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// Windows (requires interface GUID)
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configurator, err := platform.NewWindowsDNSConfigurator("{GUID-HERE}")
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```
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### Platform Detection Utilities
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```go
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// Check if systemd-resolved is available
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if platform.IsSystemdResolvedAvailable() {
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// Use systemd-resolved
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}
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// Check if NetworkManager is available
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if platform.IsNetworkManagerAvailable() {
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// Use NetworkManager
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}
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// Check if resolvconf is available
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if platform.IsResolvconfAvailable() {
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// Use resolvconf
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}
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// Get system DNS servers
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servers, err := platform.GetSystemDNS()
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```
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## Implementation Details
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### macOS (Darwin)
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Uses `scutil` to create DNS configuration states in the system configuration database. DNS settings are applied via the Network Service state hierarchy.
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**Pros:**
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- Native macOS API
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- Proper integration with system preferences
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- Supports DNS flushing
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**Cons:**
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- Requires elevated privileges
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### Windows
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Modifies registry keys under `SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{GUID}`.
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**Pros:**
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- Direct registry manipulation
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- Immediate effect after cache flush
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**Cons:**
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- Requires interface GUID
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- Requires administrator privileges
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- May require restart of DNS client service
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### Linux: systemd-resolved
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Uses D-Bus API to communicate with systemd-resolved service.
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**Pros:**
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- Modern standard on many distributions
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- Proper per-interface configuration
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- No file manipulation needed
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**Cons:**
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- Requires D-Bus access
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- Only available on systemd systems
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- Interface-specific
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### Linux: NetworkManager
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Uses D-Bus API to modify NetworkManager connection settings.
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**Pros:**
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- Common on desktop Linux
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- Integrates with NetworkManager GUI
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- Per-interface configuration
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**Cons:**
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- Requires NetworkManager to be running
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- D-Bus access required
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- Interface-specific
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### Linux: resolvconf
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Uses the `resolvconf` utility to update DNS configuration.
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**Pros:**
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- Works on many different systems
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- Handles merging of multiple DNS sources
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- Supports both openresolv and Debian resolvconf
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**Cons:**
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- Requires resolvconf to be installed
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- Interface-specific
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### Linux: Direct File
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Directly modifies `/etc/resolv.conf` with backup.
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**Pros:**
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- Works everywhere
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- No dependencies
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- Simple and reliable
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**Cons:**
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- May be overwritten by DHCP or other services
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- No per-interface configuration
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- Doesn't integrate with system tools
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## Build Tags
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The module uses build tags to compile platform-specific code:
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- `//go:build darwin && !ios` - macOS (non-iOS)
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- `//go:build windows` - Windows
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- `//go:build (linux && !android) || freebsd` - Linux and FreeBSD
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- `//go:build linux && !android` - Linux only (for systemd)
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## Dependencies
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- `github.com/godbus/dbus/v5` - D-Bus communication (Linux only)
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- `golang.org/x/sys` - System calls and registry access
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- Standard library
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## Security Considerations
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- **Elevated Privileges**: Most DNS modification operations require root/administrator privileges
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- **Backup Files**: Backup files contain original DNS configuration and should be protected
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- **State Persistence**: DNS state is stored in memory; unexpected termination may require manual cleanup
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## Cleanup
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The module properly cleans up after itself:
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1. Backup files are created before modification
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2. Original DNS servers are stored in memory
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3. `RestoreDNS()` should be called to restore original settings
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4. On Linux file-based systems, backup files are removed after restoration
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## Testing
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Each configurator can be tested independently:
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```go
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func TestDNSOverride(t *testing.T) {
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configurator, err := platform.NewFileDNSConfigurator()
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require.NoError(t, err)
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servers := []netip.Addr{
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netip.MustParseAddr("1.1.1.1"),
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}
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original, err := configurator.SetDNS(servers)
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require.NoError(t, err)
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defer configurator.RestoreDNS()
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current, err := configurator.GetCurrentDNS()
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require.NoError(t, err)
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require.Equal(t, servers, current)
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}
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```
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## Future Enhancements
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- [ ] Support for search domains configuration
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- [ ] Support for DNS options (timeout, attempts, etc.)
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- [ ] Monitoring for external DNS changes
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- [ ] Automatic restoration on process exit
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- [ ] Windows NRPT (Name Resolution Policy Table) support
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- [ ] IPv6 DNS server support on all platforms
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@@ -1,174 +0,0 @@
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# DNS Platform Module Refactoring Summary
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## Changes Made
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Successfully refactored the DNS platform directory from a NetBird-derived codebase into a standalone, simplified DNS override module.
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### Files Created
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**Core Interface & Types:**
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- `types.go` - DNSConfigurator interface and shared types (DNSConfig, DNSState)
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**Platform Implementations:**
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- `darwin.go` - macOS DNS configurator using scutil (replaces host_darwin.go)
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- `windows.go` - Windows DNS configurator using registry (replaces host_windows.go)
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- `file.go` - Linux/Unix file-based configurator (replaces file_unix.go + file_parser_unix.go + file_repair_unix.go)
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- `networkmanager.go` - NetworkManager D-Bus configurator (replaces network_manager_unix.go)
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- `systemd.go` - systemd-resolved D-Bus configurator (replaces systemd_linux.go)
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- `resolvconf.go` - resolvconf utility configurator (replaces resolvconf_unix.go)
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**Detection & Helpers:**
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- `detect_unix.go` - Automatic detection for Linux/FreeBSD
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- `detect_darwin.go` - Automatic detection for macOS
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- `detect_windows.go` - Automatic detection for Windows
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**Documentation:**
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- `README.md` - Comprehensive module documentation
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- `examples/example_usage.go` - Usage examples for all platforms
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### Files Removed
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**Old NetBird-specific files:**
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- `dbus_unix.go` - D-Bus utilities (functionality moved into platform-specific files)
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- `file_parser_unix.go` - resolv.conf parser (simplified and integrated into file.go)
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- `file_repair_unix.go` - File watching/repair (removed - out of scope)
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- `file_unix.go` - Old file configurator (replaced by file.go)
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- `host_darwin.go` - Old macOS configurator (replaced by darwin.go)
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- `host_unix.go` - Old Unix manager factory (replaced by detect_unix.go)
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- `host_windows.go` - Old Windows configurator (replaced by windows.go)
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- `network_manager_unix.go` - Old NetworkManager (replaced by networkmanager.go)
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- `resolvconf_unix.go` - Old resolvconf (replaced by resolvconf.go)
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- `systemd_linux.go` - Old systemd-resolved (replaced by systemd.go)
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- `unclean_shutdown_*.go` - Unclean shutdown detection (removed - out of scope)
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### Key Architectural Changes
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1. **Removed Build Tags for Platform Selection**
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- Old: Used `//go:build` tags at top of files to compile different code per platform
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- New: Named structs differently per platform (e.g., `DarwinDNSConfigurator`, `WindowsDNSConfigurator`)
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- Build tags kept only where necessary for cross-platform library imports
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2. **Simplified Interface**
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- Removed complex domain routing, search domains, and port customization
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- Focused on core functionality: Set DNS, Get DNS, Restore DNS
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- Removed state manager dependencies
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3. **Removed External Dependencies**
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- Removed: statemanager, NetBird-specific types, logging libraries
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- Kept only: D-Bus (for Linux), x/sys (for Windows registry and Unix syscalls)
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- Uses standard library where possible
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4. **Standalone Operation**
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- No longer depends on NetBird types (HostDNSConfig, etc.)
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- Uses standard library types (net/netip.Addr)
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- Self-contained backup/restore logic
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5. **Improved Code Organization**
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- Each platform has its own clearly-named file
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- Detection logic separated into detect_*.go files
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- Shared types in types.go
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- Examples in dedicated examples/ directory
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### Feature Comparison
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**Removed (out of scope for basic DNS override):**
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- Search domain management
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- Match-only domains
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- DNS port customization (except where natively supported)
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- File watching and auto-repair
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- Unclean shutdown detection
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- State persistence
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- Integration with external state managers
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**Retained (core DNS functionality):**
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- Setting DNS servers
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- Getting current DNS servers
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- Restoring original DNS servers
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- Automatic platform detection
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- DNS cache flushing
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- Backup and restore of original configuration
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||||
|
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### Platform-Specific Notes
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||||
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**macOS (Darwin):**
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- Simplified to focus on DNS server override using scutil
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- Removed complex domain routing and local DNS setup
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- Removed GPO and state management
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- Kept DNS cache flushing
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|
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**Windows:**
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||||
- Simplified registry manipulation to just NameServer key
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- Removed NRPT (Name Resolution Policy Table) support
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- Removed DNS registration and WINS management
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||||
- Kept DNS cache flushing
|
||||
|
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**Linux - File-based:**
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||||
- Direct /etc/resolv.conf manipulation with backup
|
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- Removed file watching and auto-repair
|
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- Removed complex search domain merging logic
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||||
- Simple nameserver-only configuration
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|
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**Linux - systemd-resolved:**
|
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- D-Bus API for per-link DNS configuration
|
||||
- Simplified to just DNS server setting
|
||||
- Uses Revert method for restoration
|
||||
|
||||
**Linux - NetworkManager:**
|
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- D-Bus API for connection settings modification
|
||||
- Simplified to IPv4 DNS only
|
||||
- Removed search/match domain complexity
|
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|
||||
**Linux - resolvconf:**
|
||||
- Uses resolvconf utility (openresolv or Debian resolvconf)
|
||||
- Interface-specific configuration
|
||||
- Simple nameserver configuration
|
||||
|
||||
### Usage Pattern
|
||||
|
||||
```go
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||||
// Automatic detection
|
||||
configurator, err := platform.DetectBestConfigurator("eth0")
|
||||
|
||||
// Set DNS
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||||
original, err := configurator.SetDNS([]netip.Addr{
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||||
netip.MustParseAddr("8.8.8.8"),
|
||||
})
|
||||
|
||||
// Restore
|
||||
defer configurator.RestoreDNS()
|
||||
```
|
||||
|
||||
### Maintenance Notes
|
||||
|
||||
- Each platform implementation is independent
|
||||
- No shared state between configurators
|
||||
- Backups are file-based or in-memory only
|
||||
- No external database or state management required
|
||||
- Configurators can be tested independently
|
||||
|
||||
## Migration Guide
|
||||
|
||||
If you were using the old code:
|
||||
|
||||
1. Replace `HostDNSConfig` with simple `[]netip.Addr` for DNS servers
|
||||
2. Replace `newHostManager()` with `platform.DetectBestConfigurator()`
|
||||
3. Replace `applyDNSConfig()` with `SetDNS()`
|
||||
4. Replace `restoreHostDNS()` with `RestoreDNS()`
|
||||
5. Remove state manager dependencies
|
||||
6. Remove search domain configuration (can be added back if needed)
|
||||
|
||||
## Dependencies
|
||||
|
||||
Required:
|
||||
- `github.com/godbus/dbus/v5` - For Linux D-Bus configurators
|
||||
- `golang.org/x/sys` - For Windows registry and Unix syscalls
|
||||
- Standard library
|
||||
|
||||
## Testing Recommendations
|
||||
|
||||
Each configurator should be tested on its target platform:
|
||||
- macOS: Test darwin.go with scutil
|
||||
- Windows: Test windows.go with actual interface GUID
|
||||
- Linux: Test all variants (file, systemd, networkmanager, resolvconf)
|
||||
- Verify backup/restore functionality
|
||||
- Test with invalid input (empty servers, bad interface names)
|
||||
@@ -1,236 +0,0 @@
|
||||
package main
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"log"
|
||||
"net/netip"
|
||||
"os"
|
||||
"os/signal"
|
||||
"syscall"
|
||||
"time"
|
||||
|
||||
"github.com/your-org/olm/dns/platform"
|
||||
)
|
||||
|
||||
func main() {
|
||||
// Example 1: Automatic detection and DNS override
|
||||
exampleAutoDetection()
|
||||
|
||||
// Example 2: Manual platform selection
|
||||
// exampleManualSelection()
|
||||
|
||||
// Example 3: Get current system DNS
|
||||
// exampleGetCurrentDNS()
|
||||
}
|
||||
|
||||
// exampleAutoDetection demonstrates automatic detection of the best DNS configurator
|
||||
func exampleAutoDetection() {
|
||||
fmt.Println("=== Example 1: Automatic Detection ===")
|
||||
|
||||
// On Linux/Unix, provide an interface name for better detection
|
||||
// On macOS, the interface name is ignored
|
||||
// On Windows, provide the interface GUID
|
||||
ifaceName := "eth0" // Change this to your interface name
|
||||
|
||||
configurator, err := platform.DetectBestConfigurator(ifaceName)
|
||||
if err != nil {
|
||||
log.Fatalf("Failed to detect DNS configurator: %v", err)
|
||||
}
|
||||
|
||||
fmt.Printf("Using DNS configurator: %s\n", configurator.Name())
|
||||
|
||||
// Get current DNS servers before changing
|
||||
currentDNS, err := configurator.GetCurrentDNS()
|
||||
if err != nil {
|
||||
log.Printf("Warning: Could not get current DNS: %v", err)
|
||||
} else {
|
||||
fmt.Printf("Current DNS servers: %v\n", currentDNS)
|
||||
}
|
||||
|
||||
// Set new DNS servers
|
||||
newDNS := []netip.Addr{
|
||||
netip.MustParseAddr("1.1.1.1"), // Cloudflare
|
||||
netip.MustParseAddr("8.8.8.8"), // Google
|
||||
}
|
||||
|
||||
fmt.Printf("Setting DNS servers to: %v\n", newDNS)
|
||||
originalDNS, err := configurator.SetDNS(newDNS)
|
||||
if err != nil {
|
||||
log.Fatalf("Failed to set DNS: %v", err)
|
||||
}
|
||||
|
||||
fmt.Printf("Original DNS servers (backed up): %v\n", originalDNS)
|
||||
|
||||
// Set up signal handling for graceful shutdown
|
||||
sigChan := make(chan os.Signal, 1)
|
||||
signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
|
||||
|
||||
// Run for 30 seconds or until interrupted
|
||||
fmt.Println("\nDNS override active. Press Ctrl+C to restore original DNS.")
|
||||
fmt.Println("Waiting 30 seconds...")
|
||||
|
||||
select {
|
||||
case <-time.After(30 * time.Second):
|
||||
fmt.Println("\nTimeout reached.")
|
||||
case sig := <-sigChan:
|
||||
fmt.Printf("\nReceived signal: %v\n", sig)
|
||||
}
|
||||
|
||||
// Restore original DNS
|
||||
fmt.Println("Restoring original DNS servers...")
|
||||
if err := configurator.RestoreDNS(); err != nil {
|
||||
log.Fatalf("Failed to restore DNS: %v", err)
|
||||
}
|
||||
|
||||
fmt.Println("DNS restored successfully!")
|
||||
}
|
||||
|
||||
// exampleManualSelection demonstrates manual selection of DNS configurator
|
||||
func exampleManualSelection() {
|
||||
fmt.Println("=== Example 2: Manual Selection ===")
|
||||
|
||||
// Linux - systemd-resolved
|
||||
configurator, err := platform.NewSystemdResolvedDNSConfigurator("eth0")
|
||||
if err != nil {
|
||||
log.Fatalf("Failed to create systemd-resolved configurator: %v", err)
|
||||
}
|
||||
|
||||
fmt.Printf("Using: %s\n", configurator.Name())
|
||||
|
||||
newDNS := []netip.Addr{
|
||||
netip.MustParseAddr("1.1.1.1"),
|
||||
}
|
||||
|
||||
originalDNS, err := configurator.SetDNS(newDNS)
|
||||
if err != nil {
|
||||
log.Fatalf("Failed to set DNS: %v", err)
|
||||
}
|
||||
|
||||
fmt.Printf("Changed from %v to %v\n", originalDNS, newDNS)
|
||||
|
||||
// Restore after 10 seconds
|
||||
time.Sleep(10 * time.Second)
|
||||
configurator.RestoreDNS()
|
||||
}
|
||||
|
||||
// exampleGetCurrentDNS demonstrates getting current system DNS
|
||||
func exampleGetCurrentDNS() {
|
||||
fmt.Println("=== Example 3: Get Current DNS ===")
|
||||
|
||||
configurator, err := platform.DetectBestConfigurator("eth0")
|
||||
if err != nil {
|
||||
log.Fatalf("Failed to detect configurator: %v", err)
|
||||
}
|
||||
|
||||
servers, err := configurator.GetCurrentDNS()
|
||||
if err != nil {
|
||||
log.Fatalf("Failed to get DNS: %v", err)
|
||||
}
|
||||
|
||||
fmt.Printf("Current DNS servers (%s):\n", configurator.Name())
|
||||
for i, server := range servers {
|
||||
fmt.Printf(" %d. %s\n", i+1, server)
|
||||
}
|
||||
}
|
||||
|
||||
// Platform-specific examples
|
||||
|
||||
// exampleLinuxFile demonstrates direct file manipulation on Linux
|
||||
func exampleLinuxFile() {
|
||||
configurator, err := platform.NewFileDNSConfigurator()
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
|
||||
newDNS := []netip.Addr{
|
||||
netip.MustParseAddr("8.8.8.8"),
|
||||
}
|
||||
|
||||
originalDNS, err := configurator.SetDNS(newDNS)
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
|
||||
defer configurator.RestoreDNS()
|
||||
|
||||
fmt.Printf("Changed from %v to %v\n", originalDNS, newDNS)
|
||||
time.Sleep(10 * time.Second)
|
||||
}
|
||||
|
||||
// exampleLinuxNetworkManager demonstrates NetworkManager on Linux
|
||||
func exampleLinuxNetworkManager() {
|
||||
if !platform.IsNetworkManagerAvailable() {
|
||||
fmt.Println("NetworkManager is not available")
|
||||
return
|
||||
}
|
||||
|
||||
configurator, err := platform.NewNetworkManagerDNSConfigurator("eth0")
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
|
||||
newDNS := []netip.Addr{
|
||||
netip.MustParseAddr("1.1.1.1"),
|
||||
}
|
||||
|
||||
originalDNS, err := configurator.SetDNS(newDNS)
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
|
||||
defer configurator.RestoreDNS()
|
||||
|
||||
fmt.Printf("Changed from %v to %v\n", originalDNS, newDNS)
|
||||
time.Sleep(10 * time.Second)
|
||||
}
|
||||
|
||||
// exampleMacOS demonstrates macOS DNS override
|
||||
func exampleMacOS() {
|
||||
configurator, err := platform.NewDarwinDNSConfigurator()
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
|
||||
newDNS := []netip.Addr{
|
||||
netip.MustParseAddr("1.1.1.1"),
|
||||
netip.MustParseAddr("1.0.0.1"),
|
||||
}
|
||||
|
||||
originalDNS, err := configurator.SetDNS(newDNS)
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
|
||||
defer configurator.RestoreDNS()
|
||||
|
||||
fmt.Printf("Changed from %v to %v\n", originalDNS, newDNS)
|
||||
time.Sleep(10 * time.Second)
|
||||
}
|
||||
|
||||
// exampleWindows demonstrates Windows DNS override
|
||||
func exampleWindows() {
|
||||
// You need to get the interface GUID first
|
||||
// This can be obtained from:
|
||||
// - ipconfig /all (look for the interface's GUID)
|
||||
// - registry: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces
|
||||
guid := "{YOUR-INTERFACE-GUID-HERE}"
|
||||
|
||||
configurator, err := platform.NewWindowsDNSConfigurator(guid)
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
|
||||
newDNS := []netip.Addr{
|
||||
netip.MustParseAddr("1.1.1.1"),
|
||||
}
|
||||
|
||||
originalDNS, err := configurator.SetDNS(newDNS)
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
|
||||
defer configurator.RestoreDNS()
|
||||
|
||||
fmt.Printf("Changed from %v to %v\n", originalDNS, newDNS)
|
||||
time.Sleep(10 * time.Second)
|
||||
}
|
||||
Reference in New Issue
Block a user