feat: support to suspend

cmd/cmd.go

@@ -21,10 +21,3 @@ var (
 func Execute() error {
 	return rootCmd.Execute()
 }
-
-func init() {
-	rootCmd.AddCommand(runCmd)
-	rootCmd.AddCommand(validateCmd)
-	rootCmd.AddCommand(exportCmd)
-	rootCmd.AddCommand(reloadCmd)
-}

cmd/export.go

@@ -27,5 +27,6 @@ var (
 )
 
 func init() {
+	rootCmd.AddCommand(exportCmd)
 	exportCmd.AddCommand(exportOutlineCmd)
 }

cmd/reload.go

@@ -6,26 +6,42 @@
 package cmd
 
 import (
+	"fmt"
 	"github.com/spf13/cobra"
+	"github.com/v2rayA/dae/cmd/internal"
 	"os"
 	"strconv"
+	"strings"
 	"syscall"
 )
 
 var (
 	reloadCmd = &cobra.Command{
-		Use: "reload pid",
+		Use: "reload [pid]",
 		Run: func(cmd *cobra.Command, args []string) {
+			internal.AutoSu()
 			if len(args) == 0 {
-				cmd.Help()
+				_pid, err := os.ReadFile(PidFilePath)
+				if err != nil {
+					fmt.Println("Failed to read pid file:", err)
 					os.Exit(1)
 				}
+				args = []string{strings.TrimSpace(string(_pid))}
+			}
 			pid, err := strconv.Atoi(args[0])
 			if err != nil {
 				cmd.Help()
 				os.Exit(1)
 			}
-			syscall.Kill(pid, syscall.SIGUSR1)
+			if err = syscall.Kill(pid, syscall.SIGUSR1); err != nil {
+				fmt.Println(err)
+				os.Exit(1)
+			}
+			fmt.Println("OK")
 		},
 	}
 )
+
+func init() {
+	rootCmd.AddCommand(reloadCmd)
+}

cmd/run.go

@@ -10,6 +10,7 @@ import (
 	"github.com/v2rayA/dae/common/subscription"
 	"github.com/v2rayA/dae/config"
 	"github.com/v2rayA/dae/control"
+	"github.com/v2rayA/dae/pkg/config_parser"
 	"github.com/v2rayA/dae/pkg/logger"
 	"os"
 	"os/signal"
@@ -92,6 +93,7 @@ func Run(log *logrus.Logger, conf *config.Config) (err error) {
 		sigs <- nil
 	}()
 	reloading := false
+	isSuspend := false
 loop:
 	for sig := range sigs {
 		switch sig {
@@ -114,6 +116,9 @@ loop:
 				// Listening error.
 				break loop
 			}
+		case syscall.SIGHUP:
+			isSuspend = true
+			fallthrough
 		case syscall.SIGUSR1:
 			// Reload signal.
 			log.Warnln("[Reload] Received reload signal; prepare to reload")
@@ -121,7 +126,20 @@ loop:
 
 			// Load new config.
 			log.Warnln("[Reload] Load new config")
-			newConf, includes, err := readConfig(cfgFile)
+			var newConf *config.Config
+			if isSuspend {
+				isSuspend = false
+				newConf, err = emptyConfig()
+				if err != nil {
+					log.WithFields(logrus.Fields{
+						"err": err,
+					}).Errorln("[Reload] Failed to reload")
+					sdnotify.Ready()
+					continue
+				}
+			} else {
+				var includes []string
+				newConf, includes, err = readConfig(cfgFile)
 				if err != nil {
 					log.WithFields(logrus.Fields{
 						"err": err,
@@ -130,6 +148,7 @@ loop:
 					continue
 				}
 				log.Infof("Include config files: [%v]", strings.Join(includes, ", "))
+			}
 			// New logger.
 			log = logger.NewLogger(newConf.Global.LogLevel, disableTimestamp)
 			logrus.SetLevel(log.Level)
@@ -244,3 +263,18 @@ func readConfig(cfgFile string) (conf *config.Config, includes []string, err err
 	}
 	return conf, includes, nil
 }
+
+func emptyConfig() (conf *config.Config, err error) {
+	sections, err := config_parser.Parse(`global{} routing{}`)
+	if err != nil {
+		return nil, err
+	}
+	if conf, err = config.New(sections); err != nil {
+		return nil, err
+	}
+	return conf, nil
+}
+
+func init() {
+	rootCmd.AddCommand(runCmd)
+}

cmd/suspend.go

@@ -0,0 +1,47 @@
+/*
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Copyright (c) 2023, v2rayA Organization <team@v2raya.org>
+ */
+
+package cmd
+
+import (
+	"fmt"
+	"github.com/spf13/cobra"
+	"github.com/v2rayA/dae/cmd/internal"
+	"os"
+	"strconv"
+	"strings"
+	"syscall"
+)
+
+var (
+	suspendCmd = &cobra.Command{
+		Use: "suspend [pid]",
+		Run: func(cmd *cobra.Command, args []string) {
+			internal.AutoSu()
+			if len(args) == 0 {
+				_pid, err := os.ReadFile(PidFilePath)
+				if err != nil {
+					fmt.Println("Failed to read pid file:", err)
+					os.Exit(1)
+				}
+				args = []string{strings.TrimSpace(string(_pid))}
+			}
+			pid, err := strconv.Atoi(args[0])
+			if err != nil {
+				cmd.Help()
+				os.Exit(1)
+			}
+			if err = syscall.Kill(pid, syscall.SIGHUP); err != nil {
+				fmt.Println(err)
+				os.Exit(1)
+			}
+			fmt.Println("OK")
+		},
+	}
+)
+
+func init() {
+	rootCmd.AddCommand(suspendCmd)
+}

cmd/validate.go

@@ -31,5 +31,7 @@ var (
 )
 
 func init() {
+	rootCmd.AddCommand(validateCmd)
+
 	validateCmd.PersistentFlags().StringVarP(&cfgFile, "config", "c", "", "config file")
 }

control/dns_control.go

@@ -399,7 +399,7 @@ func (c *DnsController) dialSend(req *udpRequest, data []byte, upstream *dns.Ups
 			}
 		}()
 
-		_ = conn.SetDeadline(time.Now().Add(DnsNatTimeout))
+		_ = conn.SetDeadline(time.Now().Add(5 * time.Second))
 		_, err = conn.Write(data)
 		if err != nil {
 			if c.log.IsLevelEnabled(logrus.DebugLevel) {
@@ -446,7 +446,7 @@ func (c *DnsController) dialSend(req *udpRequest, data []byte, upstream *dns.Ups
 			}
 		}()
 
-		_ = conn.SetDeadline(time.Now().Add(DnsNatTimeout))
+		_ = conn.SetDeadline(time.Now().Add(5 * time.Second))
 		// We should write two byte length in the front of TCP DNS request.
 		bReq := pool.Get(2 + len(data))
 		defer pool.Put(bReq)

docs/getting-started/external-dns.md

@@ -83,9 +83,3 @@ You should configure dae as follows:
 
 4. If you bind to LAN, make sure your DHCP server will distribute dae as the DNS server (DNS request should be forwarded by dae for domain based traffic split).
 
-## 
-
-
-   ```
-
-   ```

docs/getting-started/reload-and-suspend.md

@@ -0,0 +1,30 @@
+# Reload and Suspend
+
+dae supports configuration reloading and program suspending, which can help you save a lot of time when modifying the configuration or temporarily suspend dae.
+
+**Reload**
+
+Generally, dae won't interrupt connections when reloading configuration. And it is very fast compared to restart.
+
+Usage:
+
+```shell
+dae reload
+```
+
+**Suspend**
+
+It will be useful if you want to suspend dae temporarily and recover it later.
+
+Usage:
+
+```shell
+dae suspend
+```
+
+If you want to recover, use reload:
+
+```shell
+dae reload
+```
+