Implement serving passphrase from daemon

daemon/3client.go

@@ -0,0 +1,12 @@
+package daemon
+
+import "os"
+
+func daemonIsOpen() bool {
+	// check if socketPath exists and is a file
+	fileInfo, err := os.Stat(socketPath)
+	if err != nil {
+		return false
+	}
+	return !fileInfo.IsDir()
+}