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customresolver.go
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customresolver.go
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package customresolver
import (
"context"
"net"
"time"
"github.com/erkexzcx/stoppropaganda/internal/spdnsclient"
"github.com/erkexzcx/stoppropaganda/internal/targets"
"github.com/patrickmn/go-cache"
)
var DnsCache *cache.Cache
func MakeDNSConfig() (conf *spdnsclient.SPDNSConfig) {
conf = &spdnsclient.SPDNSConfig{
Ndots: 1,
Timeout: 5 * time.Second,
Attempts: 2,
}
conf.Servers = targets.ReferenceDNSServersForHTTP
return
}
var MasterStopPropagandaResolver = &CustomResolver{
FirstResolver: &spdnsclient.SPResolver{
CustomDNSConfig: MakeDNSConfig(),
},
ParentResolver: net.DefaultResolver,
}
type CustomResolver struct {
BypassGuardResolver *BypassGuardResolver
FirstResolver *spdnsclient.SPResolver
ParentResolver *net.Resolver
}
type Resolver interface {
LookupIPAddr(context.Context, string) (names []net.IPAddr, err error)
}
func (cr *CustomResolver) LookupIPAddr(ctx context.Context, host string) (names []net.IPAddr, err error) {
if c, found := DnsCache.Get(host); found {
return c.([]net.IPAddr), nil
}
names, err = cr.LookupIPAddrNoCache(ctx, host)
if err == nil {
DnsCache.SetDefault(host, names)
}
return
}
func (cr *CustomResolver) LookupIPAddrNoCache(ctx context.Context, host string) (names []net.IPAddr, err error) {
names, err = cr.BypassGuardResolver.LookupIPAddr(ctx, host)
if err == nil {
return
}
names, err = cr.FirstResolver.LookupIPAddr(ctx, host)
if err == nil {
return
}
names, err = cr.ParentResolver.LookupIPAddr(ctx, host)
if err == nil {
return
}
return
}
func init() {
DnsCache = cache.New(5*time.Minute, 10*time.Minute)
}