Add local-port and public-tunnel reachability checks

cmd/tunnel/main.go

@@ -50,6 +50,8 @@ func run(args []string) int {
 		return runConfig(configPath, rest)
 	case "route":
 		return runRoute(configPath, rest)
+	case "check":
+		return runCheck(configPath, rest)
 	case "import":
 		return runImport(configPath, rest)
 	case "up":
@@ -87,6 +89,7 @@ Commands:
   route add <port|host:port> [--name NAME] [--proxy-protocol v1|v2]
   route remove <name>
   route list
+  check [name]              Check local targets and the public TLS path
   import --profile NAME --api URL
                              Take over an existing official opentunnel profile
   up                         Provision if needed and run in the background
@@ -335,6 +338,55 @@ func runImport(configPath string, args []string) int {
 	return 0
 }
 
+func runCheck(configPath string, args []string) int {
+	if len(args) > 1 {
+		fmt.Fprintln(os.Stderr, "usage: tunnel check [route]")
+		return 2
+	}
+	cfg, err := client.Load(configPath)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		return 1
+	}
+	if len(cfg.Routes) == 0 {
+		fmt.Println("No routes.")
+		return 0
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
+	defer cancel()
+
+	var results []client.RouteCheck
+	if len(args) == 1 {
+		results = []client.RouteCheck{client.CheckRoute(ctx, cfg, args[0])}
+	} else {
+		results = client.CheckAll(ctx, cfg)
+	}
+	failed := false
+	for _, result := range results {
+		local, public := "down", "down"
+		if result.LocalUp {
+			local = "up"
+		}
+		if result.PublicUp {
+			public = "up"
+		}
+		fmt.Printf("%-20s local=%-4s public=%-4s\n", result.Route, local, public)
+		if result.LocalError != "" {
+			fmt.Printf("  local:  %s\n", result.LocalError)
+		}
+		if result.PublicError != "" {
+			fmt.Printf("  public: %s\n", result.PublicError)
+		}
+		if !result.LocalUp || !result.PublicUp {
+			failed = true
+		}
+	}
+	if failed {
+		return 1
+	}
+	return 0
+}
+
 func runUp(configPath string) int {
 	cfg, err := client.Load(configPath)
 	if err != nil {