FEAT: Refactor allowing multiple DNS Providers

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.21 as build
+FROM golang:1.22 as build
 
 # Copy project sources
 COPY . /opt/project/

go.mod

@@ -1,6 +1,8 @@
 module github.com/mkelcik/cloudflare-ddns-update
 
-go 1.21
+go 1.22
+
+toolchain go1.22.1
 
 require github.com/cloudflare/cloudflare-go v0.83.0
 
@@ -9,6 +11,9 @@ require (
 	github.com/google/go-querystring v1.1.0 // indirect
 	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
 	github.com/hashicorp/go-retryablehttp v0.7.5 // indirect
+	github.com/levelzerotechnology/directadmin-go v0.0.0-20240302013738-63b7793ebfd3 // indirect
+	github.com/mehrdadep/dex v1.0.2 // indirect
+	github.com/spf13/cast v1.6.0 // indirect
 	golang.org/x/net v0.19.0 // indirect
 	golang.org/x/text v0.14.0 // indirect
 	golang.org/x/time v0.5.0 // indirect

go.sum

@@ -18,12 +18,18 @@ github.com/hashicorp/go-hclog v1.2.0 h1:La19f8d7WIlm4ogzNHB0JGqs5AUDAZ2UfCY4sJXc
 github.com/hashicorp/go-hclog v1.2.0/go.mod h1:whpDNt7SSdeAju8AWKIWsul05p54N/39EeqMAyrmvFQ=
 github.com/hashicorp/go-retryablehttp v0.7.5 h1:bJj+Pj19UZMIweq/iie+1u5YCdGrnxCT9yvm0e+Nd5M=
 github.com/hashicorp/go-retryablehttp v0.7.5/go.mod h1:Jy/gPYAdjqffZ/yFGCFV2doI5wjtH1ewM9u8iYVjtX8=
+github.com/levelzerotechnology/directadmin-go v0.0.0-20240302013738-63b7793ebfd3 h1:6kGC8EpZlYTvNI2ABYX87bBtgzfPrtZV8CKqLtSvyek=
+github.com/levelzerotechnology/directadmin-go v0.0.0-20240302013738-63b7793ebfd3/go.mod h1:FJ/EtEMwe3k2ABVYLXmE/K+H8cHVpVaSgihVT2XbSkc=
 github.com/mattn/go-colorable v0.1.12 h1:jF+Du6AlPIjs2BiUiQlKOX0rt3SujHxPnksPKZbaA40=
 github.com/mattn/go-colorable v0.1.12/go.mod h1:u5H1YNBxpqRaxsYJYSkiCWKzEfiAb1Gb520KVy5xxl4=
 github.com/mattn/go-isatty v0.0.14 h1:yVuAays6BHfxijgZPzw+3Zlu5yQgKGP2/hcQbHb7S9Y=
 github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94=
+github.com/mehrdadep/dex v1.0.2 h1:4rUs5xbcODC107BM6cICsfMF3qBAEqKWoZaqXClMvoo=
+github.com/mehrdadep/dex v1.0.2/go.mod h1:Vg+AUvtXkTFfNTYtQiY+NTvV3Bvyz7oiT0asmU4z440=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/spf13/cast v1.6.0 h1:GEiTHELF+vaR5dhz3VqZfFSzZjYbgeKDpBxQVS4GYJ0=
+github.com/spf13/cast v1.6.0/go.mod h1:ancEpBxwJDODSW/UG4rDrAqiKolqNNh2DX3mk86cAdo=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=

internal/config.go

@@ -10,11 +10,13 @@ import (
 
 const (
 	defaultCheckInterval       = 5 * 60
-
+	envKeyDnsToCheck           = "DNS_NAMES"
-	envKeyDnsToCheck           = "CLOUDFLARE_DNS_TO_CHECK"
 	envKeyPublicIpResolverTag  = "PUBLIC_IP_RESOLVER"
 	envKeyCloudflareApiKey     = "CLOUDFLARE_API_KEY"
 	envKeyCloudflareZone       = "CLOUDFLARE_ZONE"
+	envKeyDirectadminUser      = "DA_USER"
+	envKeyDirectadminKey       = "DA_LOGIN_KEY"
+	envKeyDirectadminUrl       = "DA_LOGIN_URL"
 	envKeyOnChangeComment      = "ON_CHANGE_COMMENT"
 	envKeyCheckIntervalSeconds = "CHECK_INTERVAL_SECONDS"
 	envKeyNotifiers            = "NOTIFIERS"
@@ -23,6 +25,10 @@ const (
 type Config struct {
 	DnsRecordsToCheck   []string
 	PublicIpResolverTag string
+	DNSProviderTag      string
+	DirectadminUsername string
+	DirectadminKey      string
+	DirectadminUrl      string
 	ApiToken            string
 	WebhookToken        string
 	CloudflareZone      string
@@ -32,12 +38,28 @@ type Config struct {
 }
 
 func (c Config) Validate() error {
+	switch c.DNSProviderTag {
+	case "cloudflare":
 		if c.ApiToken == "" {
 			return fmt.Errorf("empty api token env key %s", envKeyCloudflareApiKey)
 		}
 
-	if c.CloudflareZone == "" {
+		// if c.CloudflareZone == "" {
-		return fmt.Errorf("empty zone in env key %s", envKeyCloudflareZone)
+		// 	return fmt.Errorf("empty zone in env key %s", envKeyCloudflareZone)
+		// }
+
+	case "directadmin":
+		if c.DirectadminUrl == "" {
+			return fmt.Errorf("empty DirectAdmin URL env key %s", envKeyDirectadminUrl)
+		}
+
+		if c.DirectadminUsername == "" {
+			return fmt.Errorf("empty Username in env key %s", envKeyDirectadminUser)
+		}
+
+		if c.DirectadminKey == "" {
+			return fmt.Errorf("empty Login Key in env key %s", envKeyDirectadminKey)
+		}
 	}
 
 	if len(c.DnsRecordsToCheck) == 0 {
@@ -58,6 +80,9 @@ func NewConfig() Config {
 		DnsRecordsToCheck:   parseCommaDelimited(os.Getenv(envKeyDnsToCheck)),
 		PublicIpResolverTag: os.Getenv(envKeyPublicIpResolverTag),
 		ApiToken:            os.Getenv(envKeyCloudflareApiKey),
+		DirectadminUsername: os.Getenv(envKeyDirectadminUser),
+		DirectadminKey:      os.Getenv(envKeyDirectadminKey),
+		DirectadminUrl:      os.Getenv(envKeyDirectadminUrl),
 		CloudflareZone:      os.Getenv(envKeyCloudflareZone),
 		OnChangeComment:     os.Getenv(envKeyOnChangeComment),
 		Notifiers:           parseCommaDelimited(os.Getenv(envKeyNotifiers)),

internal/dns_providers/base_provider.go

@@ -0,0 +1,25 @@
+package dns_providers
+
+import (
+	"strings"
+)
+
+type DNSProvider interface {
+	UpdateRecord(hostname string, ip string, old_ip string) error
+}
+
+type DomainParts struct {
+	Name   string
+	Domain string
+}
+
+func GetDomainParts(hostname string) *DomainParts {
+	data := arrayToSlice(strings.Split(hostname, "."))
+
+	out := DomainParts{Name: data[0], Domain: strings.Join(data[1:], ".")}
+	return &out
+}
+
+func arrayToSlice(array []string) []string {
+	return array[:]
+}

internal/dns_providers/cloudflare.go

@@ -0,0 +1,85 @@
+package dns_providers
+
+import (
+	"context"
+	"log"
+
+	"github.com/cloudflare/cloudflare-go"
+	"github.com/mkelcik/cloudflare-ddns-update/internal"
+)
+
+const (
+	CloudflareTag = "cloudflare"
+)
+
+type CloudflareProvider struct {
+	Context context.Context
+	Client  *cloudflare.API
+	Config  internal.Config
+}
+
+func (d *CloudflareProvider) UpdateRecord(hostname string, ip string, old_ip string) error {
+	// old_ip is not required for Cloudflare updates
+	domain_parts := GetDomainParts(hostname)
+	zoneId := d.FindZoneIdByName(domain_parts.Domain)
+	dnsRecords, err := d.GetDnsRecord(hostname, zoneId)
+
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	update := cloudflare.UpdateDNSRecordParams{
+		ID:      dnsRecords[0].ID,
+		Content: ip,
+	}
+
+	if d.Config.OnChangeComment != "" {
+		update.Comment = &d.Config.OnChangeComment
+	}
+
+	_, err = d.Client.UpdateDNSRecord(d.Context, cloudflare.ZoneIdentifier(zoneId), update)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (d *CloudflareProvider) NewClient(api_token string) {
+	api, err := cloudflare.NewWithAPIToken(api_token)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	d.Client = api
+}
+
+func (d *CloudflareProvider) FindZoneIdByName(hostname string) string {
+	// Fetch user details on the account
+	zoneID, err := d.Client.ZoneIDByName(hostname)
+	if err != nil {
+		log.Fatal(err)
+	}
+	return zoneID
+}
+
+func (d *CloudflareProvider) GetDnsRecord(name string, zoneId string) ([]cloudflare.DNSRecord, error) {
+
+	params := cloudflare.ListDNSRecordsParams{
+		Name: name,
+	}
+
+	page, _, err := d.Client.ListDNSRecords(d.Context, cloudflare.ZoneIdentifier(zoneId), params)
+	if err != nil {
+		return nil, err
+	}
+
+	return page, nil
+}
+
+func NewCloudflareProvider(ctx context.Context, config internal.Config) *CloudflareProvider {
+	c := &CloudflareProvider{}
+	c.Context = ctx
+	c.Config = config
+	c.NewClient(c.Config.ApiToken)
+	return c
+}

internal/dns_providers/directadmin.go

@@ -0,0 +1,55 @@
+package dns_providers
+
+import (
+	"context"
+	"time"
+
+	"github.com/levelzerotechnology/directadmin-go"
+	"github.com/mkelcik/cloudflare-ddns-update/internal"
+)
+
+const (
+	DirectadminTag = "directadmin"
+)
+
+type Directadmin struct {
+	Client  *directadmin.UserContext
+	Context context.Context
+	Config  internal.Config
+}
+
+func (d *Directadmin) UpdateRecord(hostname string, ip string, old_ip string) error {
+
+	result := GetDomainParts(hostname)
+
+	a := directadmin.DNSRecord{Name: result.Name, Ttl: 300, Type: "A", Value: old_ip}
+	b := directadmin.DNSRecord{Name: result.Name, Ttl: 300, Type: "A", Value: ip}
+
+	err := d.Client.UpdateDNSRecord(result.Domain, a, b)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (d *Directadmin) NewClient(server_url string, username string, key string) {
+	api, err := directadmin.New(server_url, 5*time.Second, false, false)
+	if err != nil {
+		panic(err)
+	}
+
+	userCtx, err := api.LoginAsUser(username, key)
+	if err != nil {
+		panic(err)
+	}
+
+	d.Client = userCtx
+}
+
+func NewDirectAdminProvider(ctx context.Context, config internal.Config) *Directadmin {
+	c := &Directadmin{}
+	c.Context = ctx
+	c.Config = config
+	c.NewClient(config.DirectadminUrl, config.DirectadminUsername, config.DirectadminKey)
+	return c
+}

internal/dns_resolver/dns_resolver.go

@@ -0,0 +1,29 @@
+package dns_resolver
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"os"
+	"time"
+)
+
+func ResolveHostname(host string, dns_resolver_ip string) net.IP {
+	r := &net.Resolver{
+		PreferGo: true,
+		Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
+			d := net.Dialer{
+				Timeout: time.Millisecond * time.Duration(10000),
+			}
+			return d.DialContext(ctx, network, dns_resolver_ip+":53")
+		},
+	}
+
+	ips, err := r.LookupHost(context.Background(), host)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Could not get IPs: %v\n", err)
+		os.Exit(1)
+	}
+
+	return net.ParseIP(ips[len(ips)-1])
+}

main.go

@@ -8,8 +8,9 @@ import (
 	"syscall"
 	"time"
 
-	"github.com/cloudflare/cloudflare-go"
 	"github.com/mkelcik/cloudflare-ddns-update/internal"
+	"github.com/mkelcik/cloudflare-ddns-update/internal/dns_providers"
+	"github.com/mkelcik/cloudflare-ddns-update/internal/dns_resolver"
 	"github.com/mkelcik/cloudflare-ddns-update/notifications"
 	"github.com/mkelcik/cloudflare-ddns-update/public_resolvers"
 )
@@ -34,6 +35,17 @@ func getResolver(resolverName string) (PublicIpResolver, string) {
 	}
 }
 
+func getProvider(ctx context.Context, config internal.Config) (dns_providers.DNSProvider, string) {
+	switch config.DNSProviderTag {
+	case dns_providers.DirectadminTag:
+		return dns_providers.NewDirectAdminProvider(ctx, config), dns_providers.DirectadminTag
+	case dns_providers.CloudflareTag:
+		fallthrough
+	default:
+		return dns_providers.NewCloudflareProvider(ctx, config), dns_providers.CloudflareTag
+	}
+}
+
 func main() {
 	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
 	defer stop()
@@ -43,62 +55,45 @@ func main() {
 		log.Fatalln(err)
 	}
 
-	api, err := cloudflare.NewWithAPIToken(config.ApiToken)
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	// Fetch user details on the account
-	zoneID, err := api.ZoneIDByName(config.CloudflareZone)
-	if err != nil {
-		log.Fatal(err)
-	}
-
 	notifiers := notifications.GetNotifiers(config.Notifiers)
 
 	// public ip resolver
 	publicIpResolver, resolverTag := getResolver(config.PublicIpResolverTag)
+	dnsProvider, providerTag := getProvider(ctx, config)
+	log.Printf("Using DNS Provider %s", providerTag)
 
 	checkFunc := func() {
 		currentPublicIP, err := publicIpResolver.ResolvePublicIp(ctx)
 		if err != nil {
 			log.Fatal(err)
 		}
+
 		log.Printf("Current public ip `%s` (resolver: %s)", currentPublicIP, resolverTag)
 
-		dns, err := allDNSRecords(ctx, api, cloudflare.ZoneIdentifier(zoneID))
 		if err != nil {
 			log.Fatal(err)
 		}
 
-		for _, dnsRecord := range dns {
+		for _, dnsRecord := range config.DnsRecordsToCheck {
-			if internal.Contains(config.DnsRecordsToCheck, dnsRecord.Name) {
+			current_dns_record := dns_resolver.ResolveHostname(dnsRecord, "1.1.1.1")
-				log.Printf("Checking record `%s` with current value `%s` ...", dnsRecord.Name, dnsRecord.Content)
+
-				if currentPublicIP.String() == dnsRecord.Content {
+			log.Printf("Checking record `%s` with current value `%s` ...", dnsRecord, current_dns_record.String())
+			if currentPublicIP.String() == current_dns_record.String() {
 				log.Println("OK")
 				continue // no update needed
 			}
 
-				update := cloudflare.UpdateDNSRecordParams{
+			if err := dnsProvider.UpdateRecord(dnsRecord, currentPublicIP.String(), current_dns_record.String()); err != nil {
-					ID:      dnsRecord.ID,
-					Content: currentPublicIP.String(),
-				}
-
-				if config.OnChangeComment != "" {
-					update.Comment = &config.OnChangeComment
-				}
-
-				if _, err := api.UpdateDNSRecord(ctx, cloudflare.ZoneIdentifier(zoneID), update); err != nil {
 				log.Printf("error updating dns record: %s", err)
 				continue
 			}
 
 			if err := notifiers.NotifyWithLog(ctx, notifications.Notification{
-					OldIp:        net.ParseIP(dnsRecord.Content),
+				OldIp:        net.ParseIP(string(current_dns_record)),
 				NewIp:        currentPublicIP,
 				CheckedAt:    time.Now(),
 				ResolverTag:  resolverTag,
-					Domain:       dnsRecord.Name,
+				Domain:       dnsRecord,
 				WebhookToken: config.WebhookToken,
 			}); err != nil {
 				log.Printf("errors in notifications: %s", err)
@@ -106,7 +101,6 @@ func main() {
 			log.Printf("Updated to `%s`", currentPublicIP)
 		}
 	}
-	}
 
 	log.Printf("checking ...")
 	checkFunc()
@@ -124,23 +118,3 @@ func main() {
 		}
 	}
 }
-
-func allDNSRecords(ctx context.Context, api *cloudflare.API, rc *cloudflare.ResourceContainer) ([]cloudflare.DNSRecord, error) {
-	out := make([]cloudflare.DNSRecord, 0, 100)
-	params := cloudflare.ListDNSRecordsParams{
-		ResultInfo: cloudflare.ResultInfo{Page: 1},
-	}
-	for {
-		page, res, err := api.ListDNSRecords(ctx, rc, params)
-		if err != nil {
-			return nil, err
-		}
-		out = append(out, page...)
-
-		if res.Page >= res.TotalPages {
-			break
-		}
-		params.Page++
-	}
-	return out, nil
-}