Fix lint errors

dns/client.go

@@ -70,10 +70,7 @@ func NewClient(options ClientOptions) *Client {
 	if client.timeout == 0 {
 		client.timeout = C.DNSTimeout
 	}
-	cacheCapacity := options.CacheCapacity
-	if cacheCapacity < 1024 {
-		cacheCapacity = 1024
-	}
+	cacheCapacity := max(options.CacheCapacity, 1024)
 	if !client.disableCache {
 		if !client.independentCache {
 			client.cache = common.Must1(freelru.NewSharded[dns.Question, *dns.Msg](cacheCapacity, maphash.NewHasher[dns.Question]().Hash32))
@@ -334,9 +331,10 @@ func (c *Client) Lookup(ctx context.Context, transport adapter.DNSTransport, dom
 	if options.LookupStrategy != C.DomainStrategyAsIS {
 		lookupOptions.Strategy = strategy
 	}
-	if strategy == C.DomainStrategyIPv4Only {
+	switch strategy {
+	case C.DomainStrategyIPv4Only:
 		return c.lookupToExchange(ctx, transport, dnsName, dns.TypeA, lookupOptions, responseChecker)
-	} else if strategy == C.DomainStrategyIPv6Only {
+	case C.DomainStrategyIPv6Only:
 		return c.lookupToExchange(ctx, transport, dnsName, dns.TypeAAAA, lookupOptions, responseChecker)
 	}
 	var response4 []netip.Addr
@@ -500,10 +498,7 @@ func (c *Client) loadResponse(question dns.Question, transport adapter.DNSTransp
 				}
 			}
 		}
-		nowTTL := int(expireAt.Sub(timeNow).Seconds())
-		if nowTTL < 0 {
-			nowTTL = 0
-		}
+		nowTTL := max(int(expireAt.Sub(timeNow).Seconds()), 0)
 		response = response.Copy()
 		if originTTL > 0 {
 			duration := uint32(originTTL - nowTTL)
@@ -551,18 +546,6 @@ func MessageToAddresses(response *dns.Msg) []netip.Addr {
 	return addresses
 }
 
-func wrapError(err error) error {
-	switch dnsErr := err.(type) {
-	case *net.DNSError:
-		if dnsErr.IsNotFound {
-			return RcodeNameError
-		}
-	case *net.AddrError:
-		return RcodeNameError
-	}
-	return err
-}
-
 type transportKey struct{}
 
 func contextWithTransportTag(ctx context.Context, transportTag string) context.Context {

dns/transport/dhcp/dhcp.go

@@ -222,7 +222,7 @@ func (t *Transport) fetchServers0(ctx context.Context, iface *control.Interface)
 		packetConn net.PacketConn
 		err        error
 	)
-	for i := 0; i < 5; i++ {
+	for range 5 {
 		packetConn, err = listener.ListenPacket(t.ctx, "udp4", listenAddr)
 		if err == nil || !errors.Is(err, syscall.EADDRINUSE) {
 			break

dns/transport/dhcp/dhcp_shared.go

@@ -72,7 +72,7 @@ func (t *Transport) tryOneName(ctx context.Context, servers []M.Socksaddr, fqdn
 	sLen := len(servers)
 	var lastErr error
 	for i := 0; i < t.attempts; i++ {
-		for j := 0; j < sLen; j++ {
+		for j := range sLen {
 			server := servers[j]
 			question := message.Question[0]
 			question.Name = fqdn

dns/transport/local/local_resolved_stub.go

@@ -1,5 +1,6 @@
 //go:build !linux
 
+//nolint:unused
 package local
 
 import (

dns/transport/local/local_shared.go

@@ -82,7 +82,7 @@ func (t *Transport) tryOneName(ctx context.Context, config *dnsConfig, fqdn stri
 	sLen := uint32(len(config.servers))
 	var lastErr error
 	for i := 0; i < config.attempts; i++ {
-		for j := uint32(0); j < sLen; j++ {
+		for j := range sLen {
 			server := config.servers[(serverOffset+j)%sLen]
 			question := message.Question[0]
 			question.Name = fqdn

dns/transport/local/resolv.go

@@ -1,3 +1,4 @@
+//nolint:unused
 package local
 
 import (

dns/transport/local/resolv_default.go

@@ -1,3 +1,4 @@
+//nolint:unused
 package local
 
 import (

dns/transport/quic/quic.go

@@ -100,7 +100,7 @@ func (t *Transport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg,
 		err      error
 		response *mDNS.Msg
 	)
-	for i := 0; i < 2; i++ {
+	for range 2 {
 		conn, _, err = t.connection.Acquire(ctx, func(ctx context.Context) (*quic.Conn, error) {
 			rawConn, err := t.dialer.DialContext(ctx, N.NetworkUDP, t.serverAddr)
 			if err != nil {

dns/transport/tls.go

@@ -102,7 +102,7 @@ func (t *TLSTransport) Reset() {
 
 func (t *TLSTransport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
 	var lastErr error
-	for attempt := 0; attempt < 2; attempt++ {
+	for range 2 {
 		conn, created, err := t.connections.Acquire(ctx, func(ctx context.Context) (*tlsDNSConn, error) {
 			tlsConn, err := t.dialer.DialTLSContext(ctx, t.serverAddr)
 			if err != nil {