Xray-core/app/dns/nameserver_fakedns.go
yuhan6665 6b6974c804
Fakedns improvements (#731)
Co-authored-by: Shelikhoo <xiaokangwang@outlook.com>
Co-authored-by: sixg0000d <sixg0000d@gmail.com>
Co-authored-by: Loyalsoldier <10487845+Loyalsoldier@users.noreply.github.com>
2021-10-20 13:15:49 +08:00

50 lines
1.2 KiB
Go

package dns
import (
"context"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/core"
"github.com/xtls/xray-core/features/dns"
)
type FakeDNSServer struct {
fakeDNSEngine dns.FakeDNSEngine
}
func NewFakeDNSServer() *FakeDNSServer {
return &FakeDNSServer{}
}
func (FakeDNSServer) Name() string {
return "FakeDNS"
}
func (f *FakeDNSServer) QueryIP(ctx context.Context, domain string, _ net.IP, opt dns.IPOption, _ bool) ([]net.IP, error) {
if f.fakeDNSEngine == nil {
if err := core.RequireFeatures(ctx, func(fd dns.FakeDNSEngine) {
f.fakeDNSEngine = fd
}); err != nil {
return nil, newError("Unable to locate a fake DNS Engine").Base(err).AtError()
}
}
var ips []net.Address
if fkr0, ok := f.fakeDNSEngine.(dns.FakeDNSEngineRev0); ok {
ips = fkr0.GetFakeIPForDomain3(domain, opt.IPv4Enable, opt.IPv6Enable)
} else {
ips = f.fakeDNSEngine.GetFakeIPForDomain(domain)
}
netIP, err := toNetIP(ips)
if err != nil {
return nil, newError("Unable to convert IP to net ip").Base(err).AtError()
}
newError(f.Name(), " got answer: ", domain, " -> ", ips).AtInfo().WriteToLog()
if len(netIP) > 0 {
return netIP, nil
}
return nil, dns.ErrEmptyResponse
}