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FINGERD(8C)                                                        FINGERD(8C)

       fingerd, in.fingerd - remote user information server


       fingerd  implements the server side of the Name/Finger protocol, speci-
       fied in RFC 742.  The Name/Finger protocol provides a remote  interface
       to  programs  which display information on system status and individual
       users.  The protocol imposes little structure  on  the  format  of  the
       exchange between client and server.  The client provides a single "com-
       mand line" to the finger server which returns a printable reply.

       fingerd waits for connections on TCP port 79.  Once connected it  reads
       a  single command line terminated by a LINEFEED which is passed to fin-
       ger(1).  fingerd closes its connections as soon as the output  is  fin-

       If  the  line  is  null (only a LINEFEED is sent) then finger returns a
       "default" report that lists all people logged into the system  at  that

       If  a  user  name  is  specified  (for instance, ericLINEFEED) 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.


       Harrenstien, Ken, NAME/FINGER, RFC 742, Network Information Center, SRI
       International, Menlo Park, Calif., December 1977.

       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.   fingerd should be taught to filter out
       IAC's and perhaps even respond negatively (IAC will not) to all  option
       commands received.

                               9 September 1987                    FINGERD(8C)