rlogind(1M)                    TCP/IP 5.4R3.00                   rlogind(1M)


NAME
       rlogind - remote login server

SYNOPSIS
       rlogind [ -d ]

DESCRIPTION
       The rlogind server is for the rlogin(1C) program.  The server
       provides a remote login facility with authentication based on
       privileged port numbers.  The -d option turns on debugging, with
       output going to /tmp/rlogind*.

       The rlogind program is invoked by the inetd server when an incoming
       connection is detected on the port specified in /etc/services.  See
       inetd(1M) and services(4) for details.  When a service request is
       received, inetd invokes rlogind and the following protocol is
       initiated:

       1)     The server checks the client's source port.  If the port is
              not in the range 0-1023, the server aborts the connection.

       2)     The server checks the client's source address.  If the address
              is associated with a host for which no corresponding entry
              exists in the hostname database (see hosts(4)), the server
              aborts the connection.

       After the source port and address have been checked, rlogind
       allocates a pseudoterminal (see pty(7)) and manipulates file
       descriptors so that the slave half of the pseudoterminal becomes the
       stdin, stdout, and stderr for a login process.  The login process is
       an instance of the login(1) program.  The login process may prompt
       for a password if the remote user is not a trusted user.

       The parent of the login process manipulates the master side of the
       pseudoterminal, operating as an intermediary between the login
       process and the client instance of the rlogin program.  In normal
       operation, the packet protocol described in pty(7) is invoked to
       provide ^S/^Q type facilities and propagate interrupt signals to the
       remote programs.

       The rlogin command and rlogind server allow for the dynamic exchange
       of window size information.  This is particularly useful in an
       environment in which you use windowing software such as X windows.
       Suppose that within a window, you use rlogin to log in to a host.  If
       you change that window's dimensions through the mouse, the new
       dimensions are propagated to the corresponding remote server,
       rlogind.  The remote kernel data structures are then changed to
       reflect these size changes.  This information exchange is transparent
       to a user.  For this enhancement to be fully realized, both the local
       and remote machines must be running the appropriate versions of
       rlogin and rlogind.

DIAGNOSTICS
       All diagnostic messages are returned on the connection associated



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rlogind(1M)                    TCP/IP 5.4R3.00                   rlogind(1M)


       with the stderr, after which any network connections are closed.  An
       error is indicated by a leading byte with a value of one (1).

       Host name for your address (clientIPaddress) unknown
                      No entry in the hostname database exists for the
                      client's machine.

       Try again      A fork by the server failed.

       /bin/sh: ...   The user's login shell could not be started.

SEE ALSO
       rlogin(1C), inetd(1M), ruserok(3X), services(4), hosts(4),
       hosts.equiv(4M), inetd.conf(4M), pty(7).

BUGS
       The authentication procedure used here assumes the integrity of each
       client machine and of the connecting medium.  This is not secure but
       is useful in an "open" environment.






































Licensed material--property of copyright holder(s)                         2