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fixed XTLS#104 and apply routing for non-local DoH requests #147

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merged 2 commits into from Jan 13, 2021
Merged

fixed XTLS#104 and apply routing for non-local DoH requests #147

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e19093d
fixed https://github.com/XTLS/Xray-core/issues/104
badO1a5A90 Jan 10, 2021
c0ed0e9
Apply routing for non-local DoH requests
badO1a5A90 Jan 10, 2021
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91 changes: 51 additions & 40 deletions app/dns/dohdns.go
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Expand Up @@ -29,6 +29,7 @@ import (
// which is compatible with traditional dns over udp(RFC1035),
// thus most of the DOH implementation is copied from udpns.go
type DoHNameServer struct {
dispatcher routing.Dispatcher
sync.RWMutex
ips map[string]record
pub *pubsub.Service
Expand All @@ -45,40 +46,8 @@ func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher, clientIP net.
newError("DNS: created Remote DOH client for ", url.String()).AtInfo().WriteToLog()
s := baseDOHNameServer(url, "DOH", clientIP)

// Dispatched connection will be closed (interrupted) after each request
// This makes DOH inefficient without a keep-alived connection
// See: core/app/proxyman/outbound/handler.go:113
// Using mux (https request wrapped in a stream layer) improves the situation.
// Recommend to use NewDoHLocalNameServer (DOHL:) if xray instance is running on
// a normal network eg. the server side of xray
tr := &http.Transport{
MaxIdleConns: 30,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 30 * time.Second,
ForceAttemptHTTP2: true,
DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
dest, err := net.ParseDestination(network + ":" + addr)
if err != nil {
return nil, err
}

link, err := dispatcher.Dispatch(ctx, dest)
if err != nil {
return nil, err
}
return cnc.NewConnection(
cnc.ConnectionInputMulti(link.Writer),
cnc.ConnectionOutputMulti(link.Reader),
), nil
},
}
s.dispatcher = dispatcher

dispatchedClient := &http.Client{
Transport: tr,
Timeout: 60 * time.Second,
}

s.httpClient = dispatchedClient
return s, nil
}

Expand Down Expand Up @@ -211,6 +180,11 @@ func (s *DoHNameServer) newReqID() uint16 {
func (s *DoHNameServer) sendQuery(ctx context.Context, domain string, option IPOption) {
newError(s.name, " querying: ", domain).AtInfo().WriteToLog(session.ExportIDToError(ctx))

if s.name+"." == "DOH//"+domain {
newError(s.name, " tries to resolve itself! Use IP or set \"hosts\" instead.").AtError().WriteToLog(session.ExportIDToError(ctx))
return
}

reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(s.clientIP))

var deadline time.Time
Expand All @@ -232,30 +206,30 @@ func (s *DoHNameServer) sendQuery(ctx context.Context, domain string, option IPO
}

dnsCtx = session.ContextWithContent(dnsCtx, &session.Content{
Protocol: "https",
SkipRoutePick: true,
Protocol: "https",
//SkipRoutePick: true,
})

// forced to use mux for DOH
dnsCtx = session.ContextWithMuxPrefered(dnsCtx, true)
// dnsCtx = session.ContextWithMuxPrefered(dnsCtx, true)

var cancel context.CancelFunc
dnsCtx, cancel = context.WithDeadline(dnsCtx, deadline)
defer cancel()

b, err := dns.PackMessage(r.msg)
if err != nil {
newError("failed to pack dns query").Base(err).AtError().WriteToLog()
newError("failed to pack dns query for ", domain).Base(err).AtError().WriteToLog()
return
}
resp, err := s.dohHTTPSContext(dnsCtx, b.Bytes())
if err != nil {
newError("failed to retrieve response").Base(err).AtError().WriteToLog()
newError("failed to retrieve response for ", domain).Base(err).AtError().WriteToLog()
return
}
rec, err := parseResponse(resp)
if err != nil {
newError("failed to handle DOH response").Base(err).AtError().WriteToLog()
newError("failed to handle DOH response for ", domain).Base(err).AtError().WriteToLog()
return
}
s.updateIP(r, rec)
Expand All @@ -273,7 +247,44 @@ func (s *DoHNameServer) dohHTTPSContext(ctx context.Context, b []byte) ([]byte,
req.Header.Add("Accept", "application/dns-message")
req.Header.Add("Content-Type", "application/dns-message")

resp, err := s.httpClient.Do(req.WithContext(ctx))
hc := s.httpClient

// Dispatched connection will be closed (interrupted) after each request
// This makes DOH inefficient without a keep-alived connection
// See: core/app/proxyman/outbound/handler.go:113
// Using mux (https request wrapped in a stream layer) improves the situation.
// Recommend to use NewDoHLocalNameServer (DOHL:) if xray instance is running on
// a normal network eg. the server side of xray

if s.dispatcher != nil {
tr := &http.Transport{
MaxIdleConns: 30,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 30 * time.Second,
ForceAttemptHTTP2: true,
DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
dest, err := net.ParseDestination(network + ":" + addr)
if err != nil {
return nil, err
}

link, err := s.dispatcher.Dispatch(ctx, dest)
if err != nil {
return nil, err
}
return cnc.NewConnection(
cnc.ConnectionInputMulti(link.Writer),
cnc.ConnectionOutputMulti(link.Reader),
), nil
},
}
hc = &http.Client{
Timeout: time.Second * 180,
Transport: tr,
}
}

resp, err := hc.Do(req.WithContext(ctx))
if err != nil {
return nil, err
}
Expand Down