兼容Android环境运行导致无法解析DNS问题,修改默认UDP队列长度从128到1024

cmd/gost/main.go

@@ -1,10 +1,12 @@
 package main
 
 import (
+	"context"
 	"crypto/tls"
 	"errors"
 	"flag"
 	"fmt"
+	"net"
 	"net/http"
 	"os"
 	"runtime"
@@ -35,14 +37,15 @@ func init() {
 	flag.StringVar(&configureFile, "C", "", "configure file")
 	flag.BoolVar(&baseCfg.Debug, "D", false, "enable debug log")
 	flag.BoolVar(&printVersion, "V", false, "print version")
+	flag.StringVar(&baseCfg.ExternalResolver, "NS", "", "External DNS Server")
 	if pprofEnabled {
 		flag.StringVar(&pprofAddr, "P", ":6060", "profiling HTTP server address")
 	}
 	flag.Parse()
 
 	if printVersion {
-		fmt.Fprintf(os.Stdout, "gost %s (%s %s/%s)\nEnhanced:\n%s\n",
-			gost.Version, runtime.Version(), runtime.GOOS, runtime.GOARCH, gost.Enhanced)
+		fmt.Fprintf(os.Stdout, "gost %s (%s %s/%s)\n",
+			gost.Version, runtime.Version(), runtime.GOOS, runtime.GOARCH)
 		os.Exit(0)
 	}
 
@@ -85,6 +88,17 @@ func main() {
 
 	gost.DefaultTLSConfig = tlsConfig
 
+	if baseCfg.ExternalResolver != "" {
+		gost.DefaultExternalResolver = parseResolver(baseCfg.ExternalResolver)
+		gost.DefaultExternalResolver.Init()
+	} else if os.Getenv("ANDROID_ROOT") != "" {
+		log.Logf("Android detected modify default DNS server to %v", gost.DefaultDNSServer)
+		net.DefaultResolver = &net.Resolver{Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
+			d := net.Dialer{}
+			return d.DialContext(ctx, network, gost.DefaultDNSServer)
+		}, PreferGo: true}
+	}
+
 	if err := start(); err != nil {
 		log.Log(err)
 		os.Exit(1)

cmd/gost/route.go

@@ -28,10 +28,11 @@ func (l *stringList) Set(value string) error {
 }
 
 type route struct {
-	ServeNodes stringList
-	ChainNodes stringList
-	Retries    int
-	Mark       int
+	ServeNodes       stringList
+	ChainNodes       stringList
+	Retries          int
+	Mark             int
+	ExternalResolver string
 }
 
 func (r *route) parseChain() (*gost.Chain, error) {