doh config use RFC8484 url format

app/dns/server.go

@@ -7,6 +7,8 @@ package dns
 import (
 	"context"
 	"log"
+	"net/url"
+	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -85,22 +87,49 @@ func New(ctx context.Context, config *Config) (*Server, error) {
 	}
 	server.hosts = hosts
 
+	parseDOHURI := func(d string, endpoint *net.Endpoint) (host string, port uint32, err error) {
+		u, err := url.Parse(d)
+		if err != nil {
+			return "", 0, err
+		}
+		host = u.Hostname()
+		port = 443
+		if u.Port() != "" {
+			p, err := strconv.ParseUint(u.Port(), 10, 16)
+			if err != nil {
+				return "", 0, err
+			}
+			port = uint32(p)
+		}
+		if endpoint.Port != 0 {
+			port = endpoint.Port
+		}
+		return
+	}
+
 	addNameServer := func(endpoint *net.Endpoint) int {
 		address := endpoint.Address.AsAddress()
 		if address.Family().IsDomain() && address.Domain() == "localhost" {
 			server.clients = append(server.clients, NewLocalNameServer())
-		} else if address.Family().IsDomain() && strings.HasPrefix(address.Domain(), "DOHL_") {
-			dohHost := address.Domain()[5:]
-			server.clients = append(server.clients, NewDoHLocalNameServer(dohHost, endpoint.Port, server.clientIP))
-		} else if address.Family().IsDomain() && strings.HasPrefix(address.Domain(), "DOH_") {
-			// DOH_ prefix makes net.Address think it's a domain
-			dohHost := address.Domain()[4:]
+		} else if address.Family().IsDomain() && strings.HasPrefix(address.Domain(), "https+local://") {
+			// URI schemed string treated as domain
+			dohlHost, dohlPort, err := parseDOHURI(address.Domain(), endpoint)
+			if err != nil {
+				log.Fatalln(newError("DNS config error").Base(err))
+			}
+			server.clients = append(server.clients, NewDoHLocalNameServer(dohlHost, dohlPort, server.clientIP))
+		} else if address.Family().IsDomain() &&
+			strings.HasPrefix(address.Domain(), "https://") {
+			dohHost, dohPort, err := parseDOHURI(address.Domain(), endpoint)
+			if err != nil {
+				log.Fatalln(newError("DNS config error").Base(err))
+			}
 			idx := len(server.clients)
 			server.clients = append(server.clients, nil)
 
 			// need the core dispatcher, register DOHClient at callback
 			common.Must(core.RequireFeatures(ctx, func(d routing.Dispatcher) {
-				c, err := NewDoHNameServer(dohHost, endpoint.Port, d, server.clientIP)
+				c, err := NewDoHNameServer(dohHost, dohPort, d, server.clientIP)
 				if err != nil {
 					log.Fatalln(newError("DNS config error").Base(err))
 				}

infra/conf/common_test.go

@@ -51,6 +51,25 @@ func TestDomainParsing(t *testing.T) {
 	}
 }
 
+func TestURLParsing(t *testing.T) {
+	{
+		rawJson := "\"https://dns.google/dns-query\""
+		var address Address
+		common.Must(json.Unmarshal([]byte(rawJson), &address))
+		if address.Domain() != "https://dns.google/dns-query" {
+			t.Error("URL: ", address.Domain())
+		}
+	}
+	{
+		rawJson := "\"https+local://dns.google/dns-query\""
+		var address Address
+		common.Must(json.Unmarshal([]byte(rawJson), &address))
+		if address.Domain() != "https+local://dns.google/dns-query" {
+			t.Error("URL: ", address.Domain())
+		}
+	}
+}
+
 func TestInvalidAddressJson(t *testing.T) {
 	rawJson := "1234"
 	var address Address