cmd/tailscale/cli: [serve/funnel] provide correct command for disabling (#9859)

The `off` subcommand removes a serve/funnel for the corresponding type and port. Previously, we were not providing this which would result in an error if someone was using something than the default https=443.

closes #9858

Signed-off-by: Tyler Smalley <tyler@tailscale.com>

cmd/tailscale/cli/serve_v2.go

@@ -268,7 +268,7 @@ func (e *serveEnv) runServeCombined(subcmd serveMode) execFunc {
 				return err
 			}
 			err = e.setServe(sc, st, dnsName, srvType, srvPort, mount, args[0], funnel)
-			msg = e.messageForPort(sc, st, dnsName, srvPort)
+			msg = e.messageForPort(sc, st, dnsName, srvType, srvPort)
 		}
 		if err != nil {
 			fmt.Fprintf(os.Stderr, "error: %v\n\n", err)
@@ -377,18 +377,27 @@ func (e *serveEnv) setServe(sc *ipn.ServeConfig, st *ipnstate.Status, dnsName st
 	return nil
 }
 
+var (
+	msgFunnelAvailable     = "Available on the internet:"
+	msgServeAvailable      = "Available within your tailnet:"
+	msgRunningInBackground = "Serve started and running in the background."
+	msgDisableProxy        = "To disable the proxy, run: tailscale %s --%s=%d off"
+	msgToExit              = "Press Ctrl+C to exit."
+)
+
 // messageForPort returns a message for the given port based on the
 // serve config and status.
-func (e *serveEnv) messageForPort(sc *ipn.ServeConfig, st *ipnstate.Status, dnsName string, srvPort uint16) string {
+func (e *serveEnv) messageForPort(sc *ipn.ServeConfig, st *ipnstate.Status, dnsName string, srvType serveType, srvPort uint16) string {
 	var output strings.Builder
 
 	hp := ipn.HostPort(net.JoinHostPort(dnsName, strconv.Itoa(int(srvPort))))
 
 	if sc.AllowFunnel[hp] == true {
-		output.WriteString("Available on the internet:\n")
+		output.WriteString(msgFunnelAvailable)
 	} else {
-		output.WriteString("Available within your tailnet:\n")
+		output.WriteString(msgServeAvailable)
 	}
+	output.WriteString("\n")
 
 	scheme := "https"
 	if sc.IsServingHTTP(srvPort) {
@@ -404,7 +413,7 @@ func (e *serveEnv) messageForPort(sc *ipn.ServeConfig, st *ipnstate.Status, dnsN
 	output.WriteString(fmt.Sprintf("%s://%s%s\n\n", scheme, dnsName, portPart))
 
 	if !e.bg {
-		output.WriteString("Press Ctrl+C to exit.")
+		output.WriteString(msgToExit)
 		return output.String()
 	}
 
@@ -452,8 +461,13 @@ func (e *serveEnv) messageForPort(sc *ipn.ServeConfig, st *ipnstate.Status, dnsN
 		output.WriteString(fmt.Sprintf("|--> tcp://%s\n", h.TCPForward))
 	}
 
-	output.WriteString("\nServe started and running in the background.\n")
-	output.WriteString(fmt.Sprintf("To disable the proxy, run: tailscale %s off", infoMap[e.subcmd].Name))
+	subCmd := infoMap[e.subcmd].Name
+	subCmdSentance := strings.ToUpper(string(subCmd[0])) + subCmd[1:]
+
+	output.WriteString("\n")
+	output.WriteString(fmt.Sprintf(msgRunningInBackground, subCmdSentance))
+	output.WriteString("\n")
+	output.WriteString(fmt.Sprintf(msgDisableProxy, subCmd, srvType.String(), srvPort))
 
 	return output.String()
 }

cmd/tailscale/cli/serve_v2_test.go

@@ -16,6 +16,7 @@ import (
 
 	"github.com/peterbourgon/ff/v3/ffcli"
 	"tailscale.com/ipn"
+	"tailscale.com/ipn/ipnstate"
 	"tailscale.com/types/logger"
 )
 
@@ -1029,6 +1030,105 @@ func TestCleanURLPath(t *testing.T) {
 	}
 }
 
+func TestMessageForPort(t *testing.T) {
+	tests := []struct {
+		name        string
+		subcmd      serveMode
+		serveConfig *ipn.ServeConfig
+		status      *ipnstate.Status
+		dnsName     string
+		srvType     serveType
+		srvPort     uint16
+		expected    string
+	}{
+		{
+			name:   "funnel-https",
+			subcmd: funnel,
+			serveConfig: &ipn.ServeConfig{
+				TCP: map[uint16]*ipn.TCPPortHandler{
+					443: {HTTPS: true},
+				},
+				Web: map[ipn.HostPort]*ipn.WebServerConfig{
+					"foo.test.ts.net:443": {
+						Handlers: map[string]*ipn.HTTPHandler{
+							"/": {Proxy: "http://127.0.0.1:3000"},
+						},
+					},
+				},
+				AllowFunnel: map[ipn.HostPort]bool{
+					"foo.test.ts.net:443": true,
+				},
+			},
+			status:  &ipnstate.Status{},
+			dnsName: "foo.test.ts.net",
+			srvType: serveTypeHTTPS,
+			srvPort: 443,
+			expected: strings.Join([]string{
+				msgFunnelAvailable,
+				"https://foo.test.ts.net",
+				"",
+				"|-- / proxy http://127.0.0.1:3000",
+				"",
+				fmt.Sprintf(msgRunningInBackground, "Funnel"),
+				fmt.Sprintf(msgDisableProxy, "funnel", "https", 443),
+			}, "\n"),
+		},
+		{
+			name:   "serve-http",
+			subcmd: serve,
+			serveConfig: &ipn.ServeConfig{
+				TCP: map[uint16]*ipn.TCPPortHandler{
+					443: {HTTP: true},
+				},
+				Web: map[ipn.HostPort]*ipn.WebServerConfig{
+					"foo.test.ts.net:80": {
+						Handlers: map[string]*ipn.HTTPHandler{
+							"/": {Proxy: "http://127.0.0.1:3000"},
+						},
+					},
+				},
+			},
+			status:  &ipnstate.Status{},
+			dnsName: "foo.test.ts.net",
+			srvType: serveTypeHTTP,
+			srvPort: 80,
+			expected: strings.Join([]string{
+				msgServeAvailable,
+				"https://foo.test.ts.net:80",
+				"",
+				"|-- / proxy http://127.0.0.1:3000",
+				"",
+				fmt.Sprintf(msgRunningInBackground, "Serve"),
+				fmt.Sprintf(msgDisableProxy, "serve", "http", 80),
+			}, "\n"),
+		},
+	}
+
+	for _, tt := range tests {
+		e := &serveEnv{bg: true, subcmd: tt.subcmd}
+
+		t.Run(tt.name, func(t *testing.T) {
+			actual := e.messageForPort(tt.serveConfig, tt.status, tt.dnsName, tt.srvType, tt.srvPort)
+
+			if actual == "" {
+				t.Errorf("Got empty message")
+			}
+
+			if actual != tt.expected {
+				t.Errorf("Got: %q; expected: %q", actual, tt.expected)
+			}
+		})
+	}
+}
+
+func unindent(s string) string {
+	lines := strings.Split(s, "\n")
+	for i, line := range lines {
+		lines[i] = strings.TrimSpace(line)
+	}
+	return strings.Join(lines, "\n")
+}
+
 func TestIsLegacyInvocation(t *testing.T) {
 	tests := []struct {
 		subcmd   serveMode