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IDENTD(8)                 BSD System Manager's Manual                IDENTD(8)

     identd -- TCP/IP Ident protocol server

     identd [-46beIilNnr] [-a address] [-c charset] [-F format] [-f fallback]
            [-g uid] [-L username] [-o osname] [-p portno] [-t seconds]
            [-u uid]

     identd is a TCP/IP server which implements the user identification proto-
     col as specified in RFC 1413.

     identd operates by looking up specific TCP/IP connections and returning
     information which may or may not be associated with the process owning
     the connection.

     The following options are available:

     -4              Bind to IPv4 addresses only.  (flag -b only)

     -6              Bind to IPv6 addresses only.  (flag -b only)

     -a address      Bind to the specified address.  This may be an IPv4 or
                     IPv6 address or even a hostname.  If a hostname is speci-
                     fied then identd will resolve it to an address (or
                     addresses) and will bind this address.  (flag -b only)

     -b              Run in the background (as daemon).

     -c charset      Specfify an optional character set designator to be
                     included in replies.  charset should be a valid charset
                     set as described in the MIME RFC in upper case charac-

     -e              Return ``UNKNOWN-ERROR'' instead of the usual ``NO-USER''
                     or ``INVALID-PORT'' error replies.

     -F format       Specify the format to display info.  The allowed format
                     specifiers are:

                     %u      print user name
                     %U      print user number
                     %g      print (primary) group name
                     %G      print (primary) group number
                     %l      print list of all groups by name
                     %L      print list of all groups by number

                     The lists of groups (%l, %L) are comma-separated, and
                     start with the primary group which is not repeated.  Any
                     other characters (preceded by %, and those not preceded
                     by it) are printed literally.  The ``default'' format is
                     %u, and you should not use anything else without using
                     the flag -o OTHER.

     -f fallback     Specify a fallback username.  If the lookup fails then
                     this username will be returned.  This can be useful for
                     when running this service on a NAT host.

     -g gid          Specify the group id number or name which the server
                     should switch to after binding itself to the TCP/IP port.

     -I              Same as -i but without the restriction that the username
                     in .ident must not match an existing user.

     -i              If the .ident file exists in the home directory of the
                     identified user, return the username found in that file
                     instead of the real username.  If the username found in
                     .ident is that of an existing user, then the real user-
                     name will be returned.

     -L username     Specify a ``lie'' username.  Return this name for all
                     ident requests.

     -l              Use syslogd(8) for logging.

     -N              Enable .noident files.  If this file exists in the home
                     directory of the identified user then return
                     ``HIDDEN-USER'' instead of the normal USERID response.

     -n              Return numeric user IDs instead of usernames.

     -o osname       Return osname instead of the default ``UNIX''.

     -p portno       Specify an alternative port number under which the server
                     should run.  The default is port 113.  (flag -b only)

     -r              Return a random name of alphanumeric characters.  If the
                     -n flag is also enabled then a random number will be

     -t seconds      Specify a timeout for the service.  The default timeout
                     is 30 seconds.

     -u uid          Specify the user id number or name to which the server
                     should switch after binding itself to the TCP/IP port.


     identd operates from inetd(8) or as standalone daemon.  Put the following
     lines into inetd.conf(5) to enable identd as an IPv4 and IPv6 service via

     ident stream tcp nowait nobody /usr/libexec/identd identd -l

     ident stream tcp6 nowait nobody /usr/libexec/identd identd -l

     If you want to run identd as standalone daemon then please use the -b
     flag (background).

     inetd.conf(5), inetd(8)

BSD                            January 31, 2004                            BSD