FINGERD(8) BSD System Manager s Manual FINGERD(8)
NAME fingerd - remote user information server
SYNOPSIS fingerd [-wulf] [-pL path] [-t timeout]
DESCRIPTION Fingerd is a simple daemon based on RFC1196 that provides an interface to the finger program at most network sites. The program is supposed to return a friendly, human-oriented status report on either the system at the moment or a particular person in depth.
If the -w option is given, remote users will get an additional Welcome to ... banner which also shows some informations (e.g. uptime, operating system name and release) about the system the fingerd is running on. Some sites may consider this a security risk as it gives out information that may be useful to crackers.
If the -u option is given, requests of the form finger @host are rejected.
If the -l option is given, information about requests made is logged. This option probably violates users privacy and should not be used on multiuser boxes.
If the -f option is given, finger forwarding (user@host1@host2) is allowed. Useful behind firewalls, but probably not wise for security and resource reasons.
The -p option allows specification of an alternate location for fingerd to find the finger program. The -L option is equivalent.
The -t option specifies the time to wait for a request before closing the connection. A value of 0 waits forever. The default is 60 seconds.
Options to fingerd should be specified in /etc/xinetd.d/finger.
The finger protocol consists mostly of specifying command arguments. The xinetd(8) super-server runs fingerd for TCP requests received on port 79. Once connected fingerd reads a single command line terminated by a CRLF which is passed to finger(1). It closes its connections as soon as all output is finished.
If the line is empty (i.e. just a CRLF is sent) then finger returns a default report that lists all people logged into the system at that moment. This feature is blocked by the -u option.
If a user name is specified (e.g. eric CRLF ) then the response lists more extended information for only that particular user, whether logged in or not. Allowable names in the command line include both login names and user names. If a name is ambiguous, all possible deriva- tions are returned.
SEE ALSO finger(1), xinetd(8)
RESTRICTIONS Connecting directly to the server from a TIP or an equally narrow-minded TELNET-protocol user program can result in meaningless attempts at option negotiation being sent to the server, which will foul up the command line interpretation.
HISTORY The finger daemon appeared in 4.3BSD.
Linux NetKit (0.17) August 29, 1996 Linux NetKit (0.17)