Finger is a request/response based User Information Protocol using port TCP/79. The client opens a connection to the remote machine to initiate a request. The client sends a one line query based on the Finger query specification and waits for the answer. A remote user information program (RUIP) processes the query, returns the result and closes the connection. The response is a series of lines consisting of printable ASCII closed carriage return-line feed (CRLF, ASCII13, ASCII10). After receiving the answer the client closes the connection as well.
The following queries can be used:
<CRLF> This is a simple query listing all users logged in to the remote machine.
USERNAME<CRLF> A query to request all available information about the user USERNAME.
USERNAME@HOST1<CRLF> Request the RUIP to forward the query to HOST1. The response to this query is all information about the user USERNAME available at the remote computer HOST1.
USERNAME@HOST1@HOST2<CRLF> Request HOST1 to forward the query to HOST2. The response to this query is all information about the user USERNAME available at the remote computer HOST2.
Published on June 04, 2020
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