Xray-core/app/dns/nameserver_local.go
2022-07-24 23:54:58 -04:00

55 lines
1.5 KiB
Go

package dns
import (
"context"
"strings"
"time"
"github.com/xtls/xray-core/common/log"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/features/dns"
"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) {
start := time.Now()
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()
log.Record(&log.DNSLog{Server: s.Name(), Domain: domain, Result: ips, Status: log.DNSQueried, Elapsed: time.Since(start), Error: err})
}
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()}
}