chore(settings): updater DNS address as string

cmd/gluetun/main.go

@@ -380,7 +380,7 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
 	updaterLogger := logger.New(log.SetComponent("updater"))
 
 	unzipper := unzip.New(httpClient)
-	parallelResolver := resolver.NewParallelResolver(allSettings.Updater.DNSAddress.String())
+	parallelResolver := resolver.NewParallelResolver(allSettings.Updater.DNSAddress)
 	providers := provider.NewProviders(storage, time.Now,
 		updaterLogger, httpClient, unzipper, parallelResolver)
 

internal/cli/update.go

@@ -5,7 +5,6 @@ import (
 	"errors"
 	"flag"
 	"fmt"
-	"net"
 	"net/http"
 	"strings"
 	"time"
@@ -22,7 +21,6 @@ import (
 
 var (
 	ErrModeUnspecified     = errors.New("at least one of -enduser or -maintainer must be specified")
-	ErrDNSAddress          = errors.New("DNS address is not valid")
 	ErrNoProviderSpecified = errors.New("no provider was specified")
 )
 
@@ -35,12 +33,12 @@ type UpdaterLogger interface {
 func (c *CLI) Update(ctx context.Context, args []string, logger UpdaterLogger) error {
 	options := settings.Updater{}
 	var endUserMode, maintainerMode, updateAll bool
-	var dnsAddress, csvProviders string
+	var csvProviders string
 	flagSet := flag.NewFlagSet("update", flag.ExitOnError)
 	flagSet.BoolVar(&endUserMode, "enduser", false, "Write results to /gluetun/servers.json (for end users)")
 	flagSet.BoolVar(&maintainerMode, "maintainer", false,
 		"Write results to ./internal/storage/servers.json to modify the program (for maintainers)")
-	flagSet.StringVar(&dnsAddress, "dns", "8.8.8.8", "DNS resolver address to use")
+	flagSet.StringVar(&options.DNSAddress, "dns", "8.8.8.8", "DNS resolver address to use")
 	flagSet.BoolVar(&updateAll, "all", false, "Update servers for all VPN providers")
 	flagSet.StringVar(&csvProviders, "providers", "", "CSV string of VPN providers to update server data for")
 	if err := flagSet.Parse(args); err != nil {
@@ -51,11 +49,6 @@ func (c *CLI) Update(ctx context.Context, args []string, logger UpdaterLogger) e
 		return ErrModeUnspecified
 	}
 
-	options.DNSAddress = net.ParseIP(dnsAddress)
-	if options.DNSAddress == nil {
-		return fmt.Errorf("%w: %s", ErrDNSAddress, dnsAddress)
-	}
-
 	if updateAll {
 		options.Providers = providers.All()
 	} else {
@@ -80,7 +73,7 @@ func (c *CLI) Update(ctx context.Context, args []string, logger UpdaterLogger) e
 	const clientTimeout = 10 * time.Second
 	httpClient := &http.Client{Timeout: clientTimeout}
 	unzipper := unzip.New(httpClient)
-	parallelResolver := resolver.NewParallelResolver(options.DNSAddress.String())
+	parallelResolver := resolver.NewParallelResolver(options.DNSAddress)
 
 	providers := provider.NewProviders(storage, time.Now, logger, httpClient, unzipper, parallelResolver)
 

internal/configuration/settings/updater.go

@@ -2,7 +2,6 @@ package settings
 
 import (
 	"fmt"
-	"net"
 	"strings"
 	"time"
 
@@ -21,8 +20,8 @@ type Updater struct {
 	Period *time.Duration
 	// DNSAddress is the DNS server address to use
 	// to resolve VPN server hostnames to IP addresses.
-	// It cannot be nil in the internal state.
+	// It cannot be the empty string in the internal state.
-	DNSAddress net.IP
+	DNSAddress string
 	// Providers is the list of VPN service providers
 	// to update server information for.
 	Providers []string
@@ -56,7 +55,7 @@ func (u Updater) Validate() (err error) {
 func (u *Updater) copy() (copied Updater) {
 	return Updater{
 		Period:     helpers.CopyDurationPtr(u.Period),
-		DNSAddress: helpers.CopyIP(u.DNSAddress),
+		DNSAddress: u.DNSAddress,
 		Providers:  helpers.CopyStringSlice(u.Providers),
 	}
 }
@@ -65,7 +64,7 @@ func (u *Updater) copy() (copied Updater) {
 // unset field of the receiver settings object.
 func (u *Updater) mergeWith(other Updater) {
 	u.Period = helpers.MergeWithDuration(u.Period, other.Period)
-	u.DNSAddress = helpers.MergeWithIP(u.DNSAddress, other.DNSAddress)
+	u.DNSAddress = helpers.MergeWithString(u.DNSAddress, other.DNSAddress)
 	u.Providers = helpers.MergeStringSlices(u.Providers, other.Providers)
 }
 
@@ -74,13 +73,13 @@ func (u *Updater) mergeWith(other Updater) {
 // settings.
 func (u *Updater) overrideWith(other Updater) {
 	u.Period = helpers.OverrideWithDuration(u.Period, other.Period)
-	u.DNSAddress = helpers.OverrideWithIP(u.DNSAddress, other.DNSAddress)
+	u.DNSAddress = helpers.OverrideWithString(u.DNSAddress, other.DNSAddress)
 	u.Providers = helpers.OverrideWithStringSlice(u.Providers, other.Providers)
 }
 
 func (u *Updater) SetDefaults(vpnProvider string) {
 	u.Period = helpers.DefaultDuration(u.Period, 0)
-	u.DNSAddress = helpers.DefaultIP(u.DNSAddress, net.IPv4(1, 1, 1, 1))
+	u.DNSAddress = helpers.DefaultString(u.DNSAddress, "1.1.1.1:53")
 	if len(u.Providers) == 0 && vpnProvider != providers.Custom {
 		u.Providers = []string{vpnProvider}
 	}

internal/configuration/sources/env/updater.go

@@ -2,7 +2,6 @@ package env
 
 import (
 	"fmt"
-	"net"
 	"time"
 
 	"github.com/qdm12/gluetun/internal/configuration/settings"
@@ -37,11 +36,11 @@ func readUpdaterPeriod() (period *time.Duration, err error) {
 	return period, nil
 }
 
-func readUpdaterDNSAddress() (ip net.IP, err error) {
+func readUpdaterDNSAddress() (address string, err error) {
 	// TODO this is currently using Cloudflare in
 	// plaintext to not be blocked by DNS over TLS by default.
 	// If a plaintext address is set in the DNS settings, this one will be used.
 	// use custom future encrypted DNS written in Go without blocking
 	// as it's too much trouble to start another parallel unbound instance for now.
-	return nil, nil
+	return "", nil
 }