rlogind(1M)      SYSTEM ADMINISTRATION COMMANDS       rlogind(1M)



NAME
     rlogind - remote login server

SYNOPSIS
     in.rlogind host.port

DESCRIPTION
     rlogind is the server for the rlogin(1) program.  The server
     provides  a  remote login facility with authentication based
     on privileged port numbers.

     rlogind is invoked by inetd(1M) when a remote login  connec-
     tion is established, and executes the following protocol:

     1)   The server checks the client's  source  port.   If  the
          port  is not in the range 0-1023, the server aborts the
          connection.  The client's address and port  number  are
          passed  as  arguments  to  rlogind by inetd in the form
          host.port with host in hexadecimal and port in decimal.

     2)   The server checks the client's source address.   If  an
          entry  for  the  client  exists  is both /etc/hosts and
          /etc/hosts.equiv, a user logging in from the client  is
          not prompted for a password.  If the address is associ-
          ated with a  host  for  which  no  corresponding  entry
          exists  in /etc/hosts, the user is prompted for a pass-
          word, regardless of whether or not  an  entry  for  the
          client is present in /etc/hosts.equiv [see hosts(4) and
          hosts.equiv(4)].

     Once the source port and address have been checked,  rlogind
     allocates a pseudo-terminal and manipulates file descriptors
     so that the slave half of the  pseudo-terminal  becomes  the
     stdin,  stdout,  and  stderr for a login process.  The login
     process is an instance of the login(1) program, invoked with
     the  -r  option.   The  login process then proceeds with the
     authentication process as  described  in  rshd(1M),  but  if
     automatic  authentication  fails,  it  reprompts the user to
     login as one finds on a standard terminal line.

     The parent of the login process manipulates the master  side
     of the pseudo-terminal, operating as an intermediary between
     the login process and the client instance of the rlogin pro-
     gram.   In normal operation, a packet protocol is invoked to
     provide Ctrl-S / Ctrl-Q type facilities and propagate inter-
     rupt signals to the remote programs.  The login process pro-
     pagates the client terminal's baud rate and  terminal  type,
     as found in the environment variable, TERM; see environ(4).

SEE ALSO
     inetd(1M), hosts(4), hosts.equiv(4).




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rlogind(1M)      SYSTEM ADMINISTRATION COMMANDS       rlogind(1M)



DIAGNOSTICS
     All diagnostic messages are returned on the connection asso-
     ciated  with the stderr, after which any network connections
     are closed.  An error is indicated by a leading byte with  a
     value of 1.

     Hostname for your address unknown.
          No entry in the host  name  database  existed  for  the
          client's machine.

     Try again.
          A fork by the server failed.

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

NOTES
     The authentication procedure used here assumes the integrity
     of  each  client machine and the connecting medium.  This is
     insecure, but is useful in an ``open'' environment.

     A facility to allow  all  data  exchanges  to  be  encrypted
     should be present.
































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