rlogind(1M)                  UNIX System V(TCP/IP)                  rlogind(1M)


NAME
      rlogind - remote login server

SYNOPSIS
      in.rlogind

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 connection is
      established, and executes the following protocol:

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

      2)    The server checks the remote client's source address.  If an entry
            for the client exists in both /etc/hosts and /etc/hosts.equiv, a
            user logging in from the client is not prompted for a password.  If
            the address is associated with a host for which no corresponding
            entry exists in /etc/hosts, the user is prompted for a password,
            regardless of whether or not an entry for the remote 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 in.login program, which is based
      on login(1).  The login process is invoked with the -r option to indicate
      that it is originated by rlogind.  The login process 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.

      rlogind manipulates the master side of the pseudo-terminal, operating as
      an intermediary between the login process and the remote client's rlogin
      program.  In normal operation, a packet protocol is invoked to provide
      Ctrl-S / Ctrl-Q type facilities and propagate interrupt signals to the
      remote programs.  The login process propagates 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)

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


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rlogind(1M)                  UNIX System V(TCP/IP)                  rlogind(1M)


      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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