Chore: use custom dialer

dns/client.go

@@ -3,6 +3,8 @@ package dns
 import (
 	"context"
 
+	"github.com/Dreamacro/clash/component/dialer"
+
 	D "github.com/miekg/dns"
 )
 
@@ -16,6 +18,8 @@ func (c *client) Exchange(m *D.Msg) (msg *D.Msg, err error) {
 }
 
 func (c *client) ExchangeContext(ctx context.Context, m *D.Msg) (msg *D.Msg, err error) {
+	c.Client.Dialer = dialer.Dialer()
+
 	// Please note that miekg/dns ExchangeContext doesn't respond to context cancel.
 	msg, _, err = c.Client.ExchangeContext(ctx, m, c.Address)
 	return

dns/doh.go

@@ -7,6 +7,8 @@ import (
 	"io/ioutil"
 	"net/http"
 
+	"github.com/Dreamacro/clash/component/dialer"
+
 	D "github.com/miekg/dns"
 )
 
@@ -17,6 +19,7 @@ const (
 
 var dohTransport = &http.Transport{
 	TLSClientConfig: &tls.Config{ClientSessionCache: globalSessionCache},
+	DialContext:     dialer.DialContext,
 }
 
 type dohClient struct {