Интерактивная система просмотра системных руководств (man-ов)
fingerd (8)
>> fingerd (8) ( FreeBSD man: Команды системного администрирования )
fingerd (8) ( Linux man: Команды системного администрирования )
BSD mandoc
NAME
fingerd
- remote user information server
SYNOPSIS
[-s
]
[-l
]
[-p filename
]
DESCRIPTION
The
utility uses a simple protocol based on
RFC1196
that provides an interface to
finger(1)
at several network sites.
It is supposed to return a friendly,
human-oriented status report on either the system at the moment
or a particular person in depth.
There is no required format and the
protocol consists mostly of specifying a single
``command line''
thus,
can also be used to implement other protocols in conjunction with the
-p
flag.
The
utility is started by
inetd(8),
which listens for
TCP
requests at port 79.
Once connected it reads a single command line
terminated by a
Aq Tn CRLF
which is passed to
finger(1).
The
utility closes its connections as soon as the output is finished.
If the line is null (i.e., just a
Aq Tn CRLF
is sent) then
finger(1)
returns a
``default''
report that lists all people logged into
the system at that moment.
If a user name is specified (e.g.
eric Aq 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 derivations are returned.
The following options may be passed to
as server program arguments in
/etc/inetd.conf
-s
Enable secure mode.
Queries without a user name are rejected and
forwarding of queries to other remote hosts is denied.
-l
Enable logging.
The name of the host originating the query is reported via
syslog(3)
at LOG_NOTICE priority.
-p
Use an alternate program as the local information provider.
The default local program
executed by
is
finger(1).
By specifying a customized local server,
this option allows a system manager
to have more control over what information is
provided to remote sites.
If
-p
is specified,
will also set the environment variable
FINGERD_REMOTE_HOST
to the name of the host making the request.
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.
The
utility should be taught to filter out
IAC 's
and perhaps even respond
negatively
(IAC WON'T
)
to all option commands received.
