Initial commit.

internal/dnsmasq/config.go

@@ -0,0 +1,73 @@
+package dnsmasq
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"os/exec"
+
+	"github.com/wild-cloud/wild-central/daemon/internal/config"
+)
+
+// ConfigGenerator handles dnsmasq configuration generation
+type ConfigGenerator struct{}
+
+// NewConfigGenerator creates a new dnsmasq config generator
+func NewConfigGenerator() *ConfigGenerator {
+	return &ConfigGenerator{}
+}
+
+// Generate creates a dnsmasq configuration from the app config
+func (g *ConfigGenerator) Generate(cfg *config.GlobalConfig, clouds []config.InstanceConfig) string {
+
+	resolution_section := ""
+	for _, cloud := range clouds {
+		resolution_section += fmt.Sprintf("local=/%s/\naddress=/%s/%s\n", cloud.Domain, cloud.Domain, cfg.Cluster.EndpointIP)
+		resolution_section += fmt.Sprintf("local=/%s/\naddress=/%s/%s\n", cloud.InternalDomain, cloud.InternalDomain, cfg.Cluster.EndpointIP)
+	}
+
+	template := `# Configuration file for dnsmasq.
+
+# Basic Settings
+interface=%s
+listen-address=%s
+domain-needed
+bogus-priv
+no-resolv
+
+# DNS Local Resolution - Central server handles these domains authoritatively
+%s
+server=1.1.1.1
+server=8.8.8.8
+
+log-queries
+log-dhcp
+`
+
+	return fmt.Sprintf(template,
+		cfg.Cloud.Dnsmasq.Interface,
+		cfg.Cloud.DNS.IP,
+		resolution_section,
+	)
+}
+
+// WriteConfig writes the dnsmasq configuration to the specified path
+func (g *ConfigGenerator) WriteConfig(cfg *config.GlobalConfig, clouds []config.InstanceConfig, configPath string) error {
+	configContent := g.Generate(cfg, clouds)
+
+	log.Printf("Writing dnsmasq config to: %s", configPath)
+	if err := os.WriteFile(configPath, []byte(configContent), 0644); err != nil {
+		return fmt.Errorf("writing dnsmasq config: %w", err)
+	}
+
+	return nil
+}
+
+// RestartService restarts the dnsmasq service
+func (g *ConfigGenerator) RestartService() error {
+	cmd := exec.Command("sudo", "/usr/bin/systemctl", "restart", "dnsmasq.service")
+	if err := cmd.Run(); err != nil {
+		return fmt.Errorf("failed to restart dnsmasq: %w", err)
+	}
+	return nil
+}