TUN-890: To support free tunnels, hostname can now be ""

cmd/cloudflared/tunnel/cmd.go

@@ -430,11 +430,6 @@ func StartServer(c *cli.Context, version string, shutdownC, graceShutdownC chan
 		logger.Warnf("Cannot determine default configuration path. No file %v in %v", defaultConfigFiles, config.DefaultConfigDirs)
 	}
 
-	// check whether client provides enough flags or env variables. If not, print help.
-	if ok := enoughOptionsSet(c); !ok {
-		return nil
-	}
-
 	if err := configMainLogger(c); err != nil {
 		return errors.Wrap(err, "Error configuring logger")
 	}

cmd/cloudflared/tunnel/configuration.go

@@ -58,24 +58,6 @@ func generateRandomClientID() string {
 	return hex.EncodeToString(id)
 }
 
-func enoughOptionsSet(c *cli.Context) bool {
-	// For cloudflared to work, the user needs to at least provide a hostname,
-	// or runs as stand alone DNS proxy .
-	// When using sudo, use -E flag to preserve env vars
-	if c.NumFlags() == 0 && c.NArg() == 0 && os.Getenv("TUNNEL_HOSTNAME") == "" && os.Getenv("TUNNEL_DNS") == "" {
-		if isRunningFromTerminal() {
-			logger.Errorf("No arguments were provided. You need to at least specify the hostname for this tunnel. See %s", quickStartUrl)
-			logger.Infof("If you want to run Argo Tunnel client as a stand alone DNS proxy, run with --proxy-dns option or set TUNNEL_DNS environment variable.")
-		} else {
-			logger.Errorf("You need to specify all the options in a configuration file, or use environment variables. See %s and %s", serviceUrl, argumentsUrl)
-			logger.Infof("If you want to run Argo Tunnel client as a stand alone DNS proxy, specify proxy-dns option in the configuration file, or set TUNNEL_DNS environment variable.")
-		}
-		cli.ShowAppHelp(c)
-		return false
-	}
-	return true
-}
-
 func handleDeprecatedOptions(c *cli.Context) error {
 	// Fail if the user provided an old authentication method
 	if c.IsSet("api-key") || c.IsSet("api-email") || c.IsSet("api-ca-key") {

validation/validation.go

@@ -15,7 +15,7 @@ var supportedProtocol = [2]string{"http", "https"}
 
 func ValidateHostname(hostname string) (string, error) {
 	if hostname == "" {
-		return "", fmt.Errorf("Hostname should not be empty")
+		return "", nil
 	}
 	// users gives url(contains schema) not just hostname
 	if strings.Contains(hostname, ":") || strings.Contains(hostname, "%3A") {

validation/validation_test.go

@@ -10,7 +10,7 @@ import (
 func TestValidateHostname(t *testing.T) {
 	var inputHostname string
 	hostname, err := ValidateHostname(inputHostname)
-	assert.Equal(t, err, fmt.Errorf("Hostname should not be empty"))
+	assert.Equal(t, err, nil)
 	assert.Empty(t, hostname)
 
 	inputHostname = "hello.example.com"