Xray-core/app/dns/nameserver_local.go
2021-10-20 00:57:14 +08:00

51 lines
1.3 KiB
Go

package dns
import (
"context"
"strings"
"github.com/xtls/xray-core/features/dns"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/features/dns/localdns"
)
// LocalNameServer is an wrapper over local DNS feature.
type LocalNameServer struct {
client *localdns.Client
}
const errEmptyResponse = "No address associated with hostname"
// QueryIP implements Server.
func (s *LocalNameServer) QueryIP(_ context.Context, domain string, _ net.IP, option dns.IPOption, _ bool) (ips []net.IP, err error) {
ips, err = s.client.LookupIP(domain, option)
if err != nil && strings.HasSuffix(err.Error(), errEmptyResponse) {
err = dns.ErrEmptyResponse
}
if len(ips) > 0 {
newError("Localhost got answer: ", domain, " -> ", ips).AtInfo().WriteToLog()
}
return
}
// Name implements Server.
func (s *LocalNameServer) Name() string {
return "localhost"
}
// NewLocalNameServer creates localdns server object for directly lookup in system DNS.
func NewLocalNameServer() *LocalNameServer {
newError("DNS: created localhost client").AtInfo().WriteToLog()
return &LocalNameServer{
client: localdns.New(),
}
}
// NewLocalDNSClient creates localdns client object for directly lookup in system DNS.
func NewLocalDNSClient() *Client {
return &Client{server: NewLocalNameServer()}
}