How to filter customlist data in rule based on some condition in InfoPath?

Question

I want to filter data of custom list based on some condition in InfoPath.

For Ex: My CustomList has following columns with multiple records, EmpName, Address, Phone, UserName, Password

I want to get all the details of LoginUser. Because I want to fill all the details of that user in TextBoxes & dropdown list.

So How can I apply rule to fetch record of user whose UserName is LoginUserName ?