mirror of
https://github.com/SagerNet/sing-box.git
synced 2025-06-08 09:32:06 +08:00
115 lines
3.0 KiB
Go
115 lines
3.0 KiB
Go
package local
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import (
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"context"
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"net"
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"net/netip"
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"os"
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"syscall"
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"time"
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"unsafe"
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"github.com/sagernet/sing-box/adapter"
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"github.com/sagernet/sing/service"
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"golang.org/x/sys/windows"
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)
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func dnsReadConfig(ctx context.Context, _ string) *dnsConfig {
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conf := &dnsConfig{
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ndots: 1,
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timeout: 5 * time.Second,
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attempts: 2,
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}
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defer func() {
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if len(conf.servers) == 0 {
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conf.servers = defaultNS
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}
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}()
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addresses, err := adapterAddresses()
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if err != nil {
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return nil
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}
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var dnsAddresses []struct {
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ifName string
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netip.Addr
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}
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for _, address := range addresses {
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if address.OperStatus != windows.IfOperStatusUp {
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continue
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}
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if address.IfType == windows.IF_TYPE_TUNNEL {
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continue
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}
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if address.FirstGatewayAddress == nil {
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continue
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}
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for dnsServerAddress := address.FirstDnsServerAddress; dnsServerAddress != nil; dnsServerAddress = dnsServerAddress.Next {
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rawSockaddr, err := dnsServerAddress.Address.Sockaddr.Sockaddr()
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if err != nil {
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continue
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}
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var dnsServerAddr netip.Addr
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switch sockaddr := rawSockaddr.(type) {
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case *syscall.SockaddrInet4:
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dnsServerAddr = netip.AddrFrom4(sockaddr.Addr)
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case *syscall.SockaddrInet6:
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if sockaddr.Addr[0] == 0xfe && sockaddr.Addr[1] == 0xc0 {
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// fec0/10 IPv6 addresses are site local anycast DNS
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// addresses Microsoft sets by default if no other
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// IPv6 DNS address is set. Site local anycast is
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// deprecated since 2004, see
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// https://datatracker.ietf.org/doc/html/rfc3879
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continue
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}
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dnsServerAddr = netip.AddrFrom16(sockaddr.Addr)
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default:
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// Unexpected type.
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continue
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}
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dnsAddresses = append(dnsAddresses, struct {
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ifName string
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netip.Addr
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}{ifName: windows.UTF16PtrToString(address.FriendlyName), Addr: dnsServerAddr})
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}
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}
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var myInterface string
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if networkManager := service.FromContext[adapter.NetworkManager](ctx); networkManager != nil {
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myInterface = networkManager.InterfaceMonitor().MyInterface()
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}
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for _, address := range dnsAddresses {
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if address.ifName == myInterface {
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continue
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}
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conf.servers = append(conf.servers, net.JoinHostPort(address.String(), "53"))
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}
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return conf
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}
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func adapterAddresses() ([]*windows.IpAdapterAddresses, error) {
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var b []byte
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l := uint32(15000) // recommended initial size
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for {
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b = make([]byte, l)
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const flags = windows.GAA_FLAG_INCLUDE_PREFIX | windows.GAA_FLAG_INCLUDE_GATEWAYS
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err := windows.GetAdaptersAddresses(syscall.AF_UNSPEC, flags, 0, (*windows.IpAdapterAddresses)(unsafe.Pointer(&b[0])), &l)
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if err == nil {
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if l == 0 {
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return nil, nil
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}
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break
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}
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if err.(syscall.Errno) != syscall.ERROR_BUFFER_OVERFLOW {
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return nil, os.NewSyscallError("getadaptersaddresses", err)
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}
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if l <= uint32(len(b)) {
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return nil, os.NewSyscallError("getadaptersaddresses", err)
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}
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}
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var aas []*windows.IpAdapterAddresses
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for aa := (*windows.IpAdapterAddresses)(unsafe.Pointer(&b[0])); aa != nil; aa = aa.Next {
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aas = append(aas, aa)
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}
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return aas, nil
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}
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