rlogind(1M)                                                     rlogind(1M)

NAME
     rlogind, in.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 connection 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 log-
        ging 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, regard-
        less 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) pro-
     gram, 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 pro-
     cess and the client instance of the rlogin program. In normal opera-
     tion, 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(5).












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rlogind(1M)                                                     rlogind(1M)

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.

     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.

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





























Page 2                       Reliant UNIX 5.44                Printed 11/98