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 tryfrom(1)                                                       tryfrom(1)

 NAME    [Toc]    [Back]
      tryfrom, sffinger - utility programs for TCP Wrappers

 SYNOPSIS    [Toc]    [Back]


 DESCRIPTION    [Toc]    [Back]
      This program identifies the end-point details related to a connection.
      This program must be called via a remote shell command as shown below.
      It is used to find out if the hostname and the address are properly
      recognized, and also if the username lookup works properly.

           # remsh host /usr/bin/tryfrom

      tryfrom prints the following output when it is invoked:

           client address   (%a):
           client hostname  (%n):
           client username  (%u):
           client info      (%c):
           server address   (%A):
           server hostname  (%N):
           server process   (%d):
           server info      (%s):

      The information related to the client describes how the remote host
      recognizes the client in terms of address, name and user name.  The
      information related to the server gives the remote host's details.

      See hosts_access(5) manual page for more information on %letter

      This is a wrapper program to the finger(1) client which offers better
      protection against the possible damage from data sent by the remote
      finger server.  This command accepts all the options supported by

      It is recommended to use this program in the implementation of traps
      in the access control language of /etc/hosts.allow and
      /etc/hosts.deny.  See hosts_access(5) man page for more information on
      setting traps.

      This program restricts each line length to 128 bytes and total
      response to a maximum of 100000 bytes.  sffinger uses 60 seconds
      time-out value in getting the response from the remote host's finger

 Hewlett-Packard Company            - 1 -   HP-UX 11i Version 2: August 2003

 tryfrom(1)                                                       tryfrom(1)

 AUTHOR    [Toc]    [Back]
      Wietse Venema (wietse@wzv.win.tue.nl),
      Department of Mathematics and Computing Science,
      Eindhoven University of Technology
      Den Dolech 2, P.O. Box 513,
      5600 MB Eindhoven, The Netherlands

 SEE ALSO    [Toc]    [Back]
      finger(1), tcpd(1M), hosts_access(5).

 Hewlett-Packard Company            - 2 -   HP-UX 11i Version 2: August 2003
[ Back ]
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