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Improve local DNS server

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世界 2025-04-12 21:26:22 +08:00
parent a6da8b6654
commit a0d382fc4e
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GPG Key ID: CD109927C34A63C4
10 changed files with 82 additions and 38 deletions
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3
dns/transport/local/local.go
View File

@ -35,6 +35,7 @@ func NewTransport(ctx context.Context, logger log.ContextLogger, tag string, opt
}
return &Transport{
TransportAdapter: dns.NewTransportAdapterWithLocalOptions(C.DNSTypeLocal, tag, options),
ctx: ctx,
hosts: hosts.NewFile(hosts.DefaultPath),
dialer: transportDialer,
}, nil
@ -57,7 +58,7 @@ func (t *Transport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg,
return dns.FixedResponse(message.Id, question, addresses, C.DefaultDNSTTL), nil
}
}
systemConfig := getSystemDNSConfig()
systemConfig := getSystemDNSConfig(t.ctx)
if systemConfig.singleRequest || !(message.Question[0].Qtype == mDNS.TypeA || message.Question[0].Qtype == mDNS.TypeAAAA) {
return t.exchangeSingleRequest(ctx, systemConfig, message, domain)
} else {

17
dns/transport/local/resolv.go
View File

@ -1,6 +1,7 @@
package local
import (
"context"
"os"
"runtime"
"strings"
@ -23,19 +24,21 @@ type resolverConfig struct {
var resolvConf resolverConfig
func getSystemDNSConfig() *dnsConfig {
resolvConf.tryUpdate("/etc/resolv.conf")
func getSystemDNSConfig(ctx context.Context) *dnsConfig {
resolvConf.tryUpdate(ctx, "/etc/resolv.conf")
return resolvConf.dnsConfig.Load()
}
func (conf *resolverConfig) init() {
conf.dnsConfig.Store(dnsReadConfig("/etc/resolv.conf"))
func (conf *resolverConfig) init(ctx context.Context) {
conf.dnsConfig.Store(dnsReadConfig(ctx, "/etc/resolv.conf"))
conf.lastChecked = time.Now()
conf.ch = make(chan struct{}, 1)
}
func (conf *resolverConfig) tryUpdate(name string) {
conf.initOnce.Do(conf.init)
func (conf *resolverConfig) tryUpdate(ctx context.Context, name string) {
conf.initOnce.Do(func() {
conf.init(ctx)
})
if conf.dnsConfig.Load().noReload {
return
@ -59,7 +62,7 @@ func (conf *resolverConfig) tryUpdate(name string) {
return
}
}
dnsConf := dnsReadConfig(name)
dnsConf := dnsReadConfig(ctx, name)
conf.dnsConfig.Store(dnsConf)
}

3
dns/transport/local/resolv_darwin_cgo.go
View File

@ -11,6 +11,7 @@ package local
import "C"
import (
"context"
"time"
E "github.com/sagernet/sing/common/exceptions"
@ -18,7 +19,7 @@ import (
"github.com/miekg/dns"
)
func dnsReadConfig(_ string) *dnsConfig {
func dnsReadConfig(_ context.Context, _ string) *dnsConfig {
if C.res_init() != 0 {
return &dnsConfig{
servers: defaultNS,

3
dns/transport/local/resolv_unix.go
View File

@ -4,6 +4,7 @@ package local
import (
"bufio"
"context"
"net"
"net/netip"
"os"
@ -13,7 +14,7 @@ import (
"github.com/miekg/dns"
)
func dnsReadConfig(name string) *dnsConfig {
func dnsReadConfig(_ context.Context, name string) *dnsConfig {
conf := &dnsConfig{
ndots: 1,
timeout: 5 * time.Second,

57
dns/transport/local/resolv_windows.go
View File

@ -1,6 +1,7 @@
package local
import (
"context"
"net"
"net/netip"
"os"
@ -8,10 +9,13 @@ import (
"time"
"unsafe"
"github.com/sagernet/sing-box/adapter"
"github.com/sagernet/sing/service"
"golang.org/x/sys/windows"
)
func dnsReadConfig(_ string) *dnsConfig {
func dnsReadConfig(ctx context.Context, _ string) *dnsConfig {
conf := &dnsConfig{
ndots: 1,
timeout: 5 * time.Second,
@ -22,35 +26,35 @@ func dnsReadConfig(_ string) *dnsConfig {
conf.servers = defaultNS
}
}()
aas, err := adapterAddresses()
addresses, err := adapterAddresses()
if err != nil {
return nil
}
for _, aa := range aas {
// Only take interfaces whose OperStatus is IfOperStatusUp(0x01) into DNS configs.
if aa.OperStatus != windows.IfOperStatusUp {
var dnsAddresses []struct {
ifName string
netip.Addr
}
for _, address := range addresses {
if address.OperStatus != windows.IfOperStatusUp {
continue
}
// Only take interfaces which have at least one gateway
if aa.FirstGatewayAddress == nil {
if address.IfType == windows.IF_TYPE_TUNNEL {
continue
}
for dns := aa.FirstDnsServerAddress; dns != nil; dns = dns.Next {
sa, err := dns.Address.Sockaddr.Sockaddr()
if address.FirstGatewayAddress == nil {
continue
}
for dnsServerAddress := address.FirstDnsServerAddress; dnsServerAddress != nil; dnsServerAddress = dnsServerAddress.Next {
rawSockaddr, err := dnsServerAddress.Address.Sockaddr.Sockaddr()
if err != nil {
continue
}
var ip netip.Addr
switch sa := sa.(type) {
var dnsServerAddr netip.Addr
switch sockaddr := rawSockaddr.(type) {
case *syscall.SockaddrInet4:
ip = netip.AddrFrom4([4]byte{sa.Addr[0], sa.Addr[1], sa.Addr[2], sa.Addr[3]})
dnsServerAddr = netip.AddrFrom4(sockaddr.Addr)
case *syscall.SockaddrInet6:
var addr16 [16]byte
copy(addr16[:], sa.Addr[:])
if addr16[0] == 0xfe && addr16[1] == 0xc0 {
if sockaddr.Addr[0] == 0xfe && sockaddr.Addr[1] == 0xc0 {
// fec0/10 IPv6 addresses are site local anycast DNS
// addresses Microsoft sets by default if no other
// IPv6 DNS address is set. Site local anycast is
@ -58,14 +62,27 @@ func dnsReadConfig(_ string) *dnsConfig {
// https://datatracker.ietf.org/doc/html/rfc3879
continue
}
ip = netip.AddrFrom16(addr16)
dnsServerAddr = netip.AddrFrom16(sockaddr.Addr)
default:
// Unexpected type.
continue
}
conf.servers = append(conf.servers, net.JoinHostPort(ip.String(), "53"))
dnsAddresses = append(dnsAddresses, struct {
ifName string
netip.Addr
}{ifName: windows.UTF16PtrToString(address.FriendlyName), Addr: dnsServerAddr})
}
}
var myInterface string
if networkManager := service.FromContext[adapter.NetworkManager](ctx); networkManager != nil {
myInterface = networkManager.InterfaceMonitor().MyInterface()
}
for _, address := range dnsAddresses {
if address.ifName == myInterface {
continue
}
conf.servers = append(conf.servers, net.JoinHostPort(address.String(), "53"))
}
return conf
}

11
experimental/libbox/config.go
View File

@ -116,6 +116,10 @@ func (s *platformInterfaceStub) FindProcessInfo(ctx context.Context, network str
return nil, os.ErrInvalid
}
func (s *platformInterfaceStub) SendNotification(notification *platform.Notification) error {
return nil
}
type interfaceMonitorStub struct{}
func (s *interfaceMonitorStub) Start() error {
@ -145,8 +149,11 @@ func (s *interfaceMonitorStub) RegisterCallback(callback tun.DefaultInterfaceUpd
func (s *interfaceMonitorStub) UnregisterCallback(element *list.Element[tun.DefaultInterfaceUpdateCallback]) {
}
func (s *platformInterfaceStub) SendNotification(notification *platform.Notification) error {
return nil
func (s *interfaceMonitorStub) RegisterMyInterface(interfaceName string) {
}
func (s *interfaceMonitorStub) MyInterface() string {
return ""
}
func FormatConfig(configContent string) (*StringBox, error) {

15
experimental/libbox/monitor.go
View File

@ -15,9 +15,10 @@ var (
type platformDefaultInterfaceMonitor struct {
*platformInterfaceWrapper
logger logger.Logger
element *list.Element[tun.NetworkUpdateCallback]
callbacks list.List[tun.DefaultInterfaceUpdateCallback]
logger logger.Logger
myInterface string
}
func (m *platformDefaultInterfaceMonitor) Start() error {
@ -102,3 +103,15 @@ func (m *platformDefaultInterfaceMonitor) updateDefaultInterface(interfaceName s
callback(newInterface, 0)
}
}
func (m *platformDefaultInterfaceMonitor) RegisterMyInterface(interfaceName string) {
m.defaultInterfaceAccess.Lock()
defer m.defaultInterfaceAccess.Unlock()
m.myInterface = interfaceName
}
func (m *platformDefaultInterfaceMonitor) MyInterface() string {
m.defaultInterfaceAccess.Lock()
defer m.defaultInterfaceAccess.Unlock()
return m.myInterface
}

1
experimental/libbox/service.go
View File

@ -164,6 +164,7 @@ func (w *platformInterfaceWrapper) OpenTun(options *tun.Options, platformOptions
if err != nil {
return nil, E.Cause(err, "query tun name")
}
options.InterfaceMonitor.RegisterMyInterface(options.Name)
dupFd, err := dup(int(tunFd))
if err != nil {
return nil, E.Cause(err, "dup tun file descriptor")

2
go.mod
View File

@ -32,7 +32,7 @@ require (
github.com/sagernet/sing-shadowsocks v0.2.8
github.com/sagernet/sing-shadowsocks2 v0.2.1
github.com/sagernet/sing-shadowtls v0.2.1-0.20250316154757-6f9e732e5056
github.com/sagernet/sing-tun v0.6.5
github.com/sagernet/sing-tun v0.6.6-0.20250428031943-0686f8c4f210
github.com/sagernet/sing-vmess v0.2.3
github.com/sagernet/smux v1.5.34-mod.2
github.com/sagernet/tailscale v1.80.3-mod.5

4
go.sum
View File

@ -186,8 +186,8 @@ github.com/sagernet/sing-shadowsocks2 v0.2.1 h1:dWV9OXCeFPuYGHb6IRqlSptVnSzOelnq
github.com/sagernet/sing-shadowsocks2 v0.2.1/go.mod h1:RnXS0lExcDAovvDeniJ4IKa2IuChrdipolPYWBv9hWQ=
github.com/sagernet/sing-shadowtls v0.2.1-0.20250316154757-6f9e732e5056 h1:GFNJQAHhSXqAfxAw1wDG/QWbdpGH5Na3k8qUynqWnEA=
github.com/sagernet/sing-shadowtls v0.2.1-0.20250316154757-6f9e732e5056/go.mod h1:HyacBPIFiKihJQR8LQp56FM4hBtd/7MZXnRxxQIOPsc=
github.com/sagernet/sing-tun v0.6.5 h1:nGfD6GNq/r0tEjdZHOV3BS6fydSmd4kBAokU5rffssg=
github.com/sagernet/sing-tun v0.6.5/go.mod h1:fisFCbC4Vfb6HqQNcwPJi2CDK2bf0Xapyz3j3t4cnHE=
github.com/sagernet/sing-tun v0.6.6-0.20250428031943-0686f8c4f210 h1:6H4BZaTqKI3YcDMyTV3E576LuJM4S4wY99xoq2T1ECw=
github.com/sagernet/sing-tun v0.6.6-0.20250428031943-0686f8c4f210/go.mod h1:fisFCbC4Vfb6HqQNcwPJi2CDK2bf0Xapyz3j3t4cnHE=
github.com/sagernet/sing-vmess v0.2.3 h1:z6Ym8dnZG7k1fP3+54vz8G0tvRVJeOoTFFeUPwXTD44=
github.com/sagernet/sing-vmess v0.2.3/go.mod h1:jDAZ0A0St1zVRkyvhAPRySOFfhC+4SQtO5VYyeFotgA=
github.com/sagernet/smux v1.5.34-mod.2 h1:gkmBjIjlJ2zQKpLigOkFur5kBKdV6bNRoFu2WkltRQ4=