82 lines
1.7 KiB
Go
82 lines
1.7 KiB
Go
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// +build android
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package dns
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import (
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"context"
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D "github.com/miekg/dns"
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"github.com/metacubex/mihomo/common/cache"
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"github.com/metacubex/mihomo/component/dhcp"
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"github.com/metacubex/mihomo/component/resolver"
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)
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const SystemDNSPlaceholder = "system"
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var systemResolver *Resolver
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var isolateHandler handler
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var _ dnsClient = (*dhcpClient)(nil)
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type dhcpClient struct {
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enable bool
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}
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func (d *dhcpClient) Address() string {
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return SystemDNSPlaceholder
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}
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func (d *dhcpClient) Exchange(m *D.Msg) (msg *D.Msg, err error) {
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return d.ExchangeContext(context.Background(), m)
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}
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func (d *dhcpClient) ExchangeContext(ctx context.Context, m *D.Msg) (msg *D.Msg, err error) {
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if s := systemResolver; s != nil {
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return s.ExchangeContext(ctx, m)
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}
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return nil, dhcp.ErrNotFound
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}
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func ServeDNSWithDefaultServer(msg *D.Msg) (*D.Msg, error) {
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if h := isolateHandler; h != nil {
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return handlerWithContext(context.Background(), h, msg)
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}
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return nil, D.ErrTime
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}
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func FlushCacheWithDefaultResolver() {
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if r := resolver.DefaultResolver; r != nil {
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r.(*Resolver).lruCache = cache.New[string, *D.Msg](cache.WithSize[string, *D.Msg](4096), cache.WithStale[string, *D.Msg](true))
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}
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}
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func UpdateSystemDNS(addr []string) {
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if len(addr) == 0 {
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systemResolver = nil
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}
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ns := make([]NameServer, 0, len(addr))
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for _, d := range addr {
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ns = append(ns, NameServer{Addr: d})
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}
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systemResolver = NewResolver(Config{Main: ns})
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}
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func UpdateIsolateHandler(resolver *Resolver, mapper *ResolverEnhancer) {
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if resolver == nil {
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isolateHandler = nil
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return
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}
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isolateHandler = NewHandler(resolver, mapper)
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}
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func newDHCPClient(ifaceName string) *dhcpClient {
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return &dhcpClient{enable: ifaceName == SystemDNSPlaceholder}
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}
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