in.fingerd - remote user information server SYNOPSIS

in.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 par- ticular person in depth.

If the -w option is given, remote users will get an addi- tional ``Welcome to ...'' banner which also shows some informations (e.g. uptime, operating system name and release) about the system the in.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 in.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 in.fingerd should be specified in /etc/inetd.conf.

The finger protocol consists mostly of specifying command arguments. The inetd(8) ``super-server'' runs in.fingerd for TCP requests received on port 79. Once connected in.fingerd reads a single command line terminated by a CRLF which is passed to finger(1). It closes its connec- tions 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 par- ticular 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 derivations are returned. SEE ALSO

finger(1), inetd(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 4.3 BSD .

Linux !NetKit? (0.17) August 29, 1996 1

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