safesocket: refactor macOS auth code, pull out separate LocalTCPPortAndToken

safesocket/safesocket_test.go

@@ -0,0 +1,13 @@
+// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package safesocket
+
+import "testing"
+
+func TestLocalTCPPortAndToken(t *testing.T) {
+	// Just test that it compiles for now (is available on all platforms).
+	port, token, err := LocalTCPPortAndToken()
+	t.Logf("got %v, %s, %v", port, token, err)
+}