Satisfying staticcheck linter

client_info.go

@@ -15,5 +15,5 @@ type LeaseFileFormat string
 
 const (
 	Dnsmasq  LeaseFileFormat = "dnsmasq"
-	IscDhcpd                 = "isc-dhcpd"
+	IscDhcpd LeaseFileFormat = "isc-dhcpd"
 )

cmd/ctrld/cli.go

@@ -50,10 +50,9 @@ var (
 )
 
 var (
-	v                    = viper.NewWithOptions(viper.KeyDelimiter("::"))
-	defaultConfigWritten = false
-	defaultConfigFile    = "ctrld.toml"
-	rootCertPool         *x509.CertPool
+	v                 = viper.NewWithOptions(viper.KeyDelimiter("::"))
+	defaultConfigFile = "ctrld.toml"
+	rootCertPool      *x509.CertPool
 )
 
 var basicModeFlags = []string{"listen", "primary_upstream", "secondary_upstream", "domains"}
@@ -897,7 +896,6 @@ func readConfigFile(writeDefaultConfig bool) bool {
 			}
 			mainLog.Load().Info().Msg("writing default config file to: " + fp)
 		}
-		defaultConfigWritten = true
 		return false
 	}
 
@@ -1382,7 +1380,7 @@ func fieldErrorMsg(fe validator.FieldError) string {
 	case "cidr":
 		return fmt.Sprintf("invalid value: %s", fe.Value())
 	case "required_unless", "required":
-		return fmt.Sprintf("value is required")
+		return "value is required"
 	case "dnsrcode":
 		return fmt.Sprintf("invalid DNS rcode value: %s", fe.Value())
 	case "ipstack":
@@ -1396,25 +1394,6 @@ func fieldErrorMsg(fe validator.FieldError) string {
 	return ""
 }
 
-// couldBeDirectListener reports whether ctrld can be a direct listener on port 53.
-// It returns true only if ctrld can listen on port 53 for all interfaces. That means
-// there's no other software listening on port 53.
-//
-// If someone listening on port 53, or ctrld could only listen on port 53 for a specific
-// interface, ctrld could only be configured as a DNS forwarder.
-func couldBeDirectListener(lc *ctrld.ListenerConfig) bool {
-	if lc == nil || lc.Port != 53 {
-		return false
-	}
-	switch lc.IP {
-	case "", "::", "0.0.0.0":
-		return true
-	default:
-		return false
-	}
-
-}
-
 func isLoopback(ipStr string) bool {
 	ip := net.ParseIP(ipStr)
 	if ip == nil {

cmd/ctrld/prog.go

@@ -326,17 +326,6 @@ var (
 	windowsEADDRINUSE   = syscall.Errno(10048)
 )
 
-func errUrlConnRefused(err error) bool {
-	var urlErr *url.Error
-	if errors.As(err, &urlErr) {
-		var opErr *net.OpError
-		if errors.As(urlErr.Err, &opErr) {
-			return errors.Is(opErr.Err, syscall.ECONNREFUSED) || errors.Is(opErr.Err, windowsECONNREFUSED)
-		}
-	}
-	return false
-}
-
 func errUrlNetworkError(err error) bool {
 	var urlErr *url.Error
 	if errors.As(err, &urlErr) {

internal/clientinfo/mdns.go

@@ -98,11 +98,9 @@ func (m *mdns) probeLoop(conns []*net.UDPConn, remoteAddr net.Addr, quitCh chan
 		if err != nil {
 			ctrld.ProxyLogger.Load().Warn().Err(err).Msg("error while probing mdns")
 			bo.BackOff(context.Background(), errors.New("mdns probe backoff"))
+			continue
 		}
-		select {
-		case <-quitCh:
-			break
-		}
+		break
 	}
 	<-quitCh
 	for _, conn := range conns {

internal/dns/direct.go

@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//lint:file-ignore U1000 satisfy CI.
+//lint:file-ignore U1000 Ignore, this file is forked from upstream code.
+//lint:file-ignore ST1005 Ignore, this file is forked from upstream code.
 
 package dns
 

internal/dns/manager_linux.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//lint:file-ignore U1000 Ignore this file, it's a copy.
+
 package dns
 
 import (

internal/router/os_freebsd.go

@@ -1,6 +1,7 @@
 package router
 
 import (
+	"bytes"
 	"fmt"
 	"net"
 	"os"
@@ -116,6 +117,11 @@ func (or *osRouter) Cleanup() error {
 	return nil
 }
 
+func isPfsense() bool {
+	b, err := os.ReadFile("/etc/platform")
+	return err == nil && bytes.HasPrefix(b, []byte("pfSense"))
+}
+
 const bsdInitScript = `#!/bin/sh
 
 # PROVIDE: {{.Name}}

internal/router/router.go

@@ -93,8 +93,7 @@ func IsOldOpenwrt() bool {
 var routerPlatform atomic.Pointer[router]
 
 type router struct {
-	name           string
-	sendClientInfo bool
+	name string
 }
 
 // Name returns name of the router platform.
@@ -241,8 +240,3 @@ func unameU() []byte {
 	out, _ := exec.Command("uname", "-u").Output()
 	return out
 }
-
-func isPfsense() bool {
-	b, err := os.ReadFile("/etc/platform")
-	return err == nil && bytes.HasPrefix(b, []byte("pfSense"))
-}