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Annotation of cci/usr/src/man/man8/rlogind.8c, revision 1.1

1.1     ! root        1: .TH RLOGIND 8C "4 March 1983"
        !             2: .UC 4
        !             3: .SH NAME
        !             4: rlogind \- remote login server
        !             5: .SH SYNOPSIS
        !             6: .B /etc/rlogind
        !             7: [
        !             8: .B \-d
        !             9: ]
        !            10: .SH DESCRIPTION
        !            11: .I Rlogind
        !            12: is the server for the 
        !            13: .IR rlogin (1C)
        !            14: program.  The server provides a remote login facility
        !            15: with authentication based on privileged port numbers.
        !            16: .PP
        !            17: .I Rlogind
        !            18: listens for service requests at the port indicated in
        !            19: the ``login'' service specification; see
        !            20: .IR services (5).
        !            21: When a service request is received the following protocol
        !            22: is initiated:
        !            23: .IP 1)
        !            24: The server checks the client's source port.
        !            25: If the port is not in the range 0-1023, the server
        !            26: aborts the connection.
        !            27: .IP 2)
        !            28: The server checks the client's source address.
        !            29: If the address is associated with a host for which no
        !            30: corresponding entry exists in the host name data base (see
        !            31: .IR hosts (5)),
        !            32: the server aborts the connection.
        !            33: .PP
        !            34: Once the source port and address have been checked, 
        !            35: .I rlogind
        !            36: allocates a pseudo terminal (see 
        !            37: .IR pty (4)),
        !            38: and manipulates file descriptors so that the slave
        !            39: half of the pseudo terminal becomes the 
        !            40: .B stdin ,
        !            41: .B stdout ,
        !            42: and
        !            43: .B stderr 
        !            44: for a login process.
        !            45: The login process is an instance of the
        !            46: .IR login (1)
        !            47: program, invoked with the
        !            48: .B \-r
        !            49: option.  The login process then proceeds with the authentication
        !            50: process as described in
        !            51: .IR rshd (8C).
        !            52: If the remote user has an
        !            53: .I equivalent
        !            54: account, 
        !            55: .I rlogind
        !            56: allows the user to log in without giving a password. On the other hand,
        !            57: if automatic authentication fails, 
        !            58: .I rlogind 
        !            59: reprompts the user
        !            60: to login as one finds on a standard terminal line.
        !            61: .PP
        !            62: The parent of the login process manipulates the master side of
        !            63: the pseduo terminal, operating as an intermediary
        !            64: between the login process and the client instance of the
        !            65: .I rlogin
        !            66: program.  In normal operation, the packet protocol described
        !            67: in
        !            68: .IR pty (4)
        !            69: is invoked to provide ^S/^Q type facilities and propagate
        !            70: interrupt signals to the remote programs.  The login process
        !            71: propagates the client terminal's baud rate and terminal type,
        !            72: as found in the environment variable, ``TERM''; see
        !            73: .IR environ (7).
        !            74: .PP
        !            75: If a session is inactive for more than 5 minutes, 
        !            76: .I rlogind
        !            77: terminates the session unless the remote host name is in the file
        !            78: .I /etc/keeprlogin.
        !            79: However, all sessions can be inactive for at most half an hour.
        !            80: A session is inactive if there is no terminal I/Os.
        !            81: .SH FORMAT OF /etc/keeprlogin
        !            82: Each entry line in 
        !            83: .I /etc/keeprlogin 
        !            84: is an 
        !            85: .I official 
        !            86: name of the remote host from which inactive sessions are allowed to
        !            87: last half an hour.
        !            88: .SH DIAGNOSTICS
        !            89: All diagnostic messages are returned on the connection
        !            90: associated with the
        !            91: .BR stderr ,
        !            92: after which any network connections are closed.
        !            93: An error is indicated by a leading byte with a value of 1.
        !            94: .PP
        !            95: .B ``Hostname for your address unknown.''
        !            96: .br
        !            97: No entry in the host name database existed for
        !            98: the client's machine.
        !            99: .PP
        !           100: .B ``Try again.''
        !           101: .br
        !           102: A
        !           103: .I fork
        !           104: by the server failed.
        !           105: .PP
        !           106: .B ``/bin/sh: ...''
        !           107: .br
        !           108: The user's login shell could not be started.
        !           109: .SH SEE ALSO
        !           110: rshd(8C)
        !           111: .SH BUGS
        !           112: The authentication procedure used here assumes the integrity
        !           113: of each client machine and the connecting medium.  This is
        !           114: insecure, but is useful in an ``open'' environment.
        !           115: .PP
        !           116: .I Rlogind
        !           117: supports at most 64 remote users.
        !           118: It uses pseudo-terminals /dev/pty[pqrs][0-9a-f].
        !           119: .PP
        !           120: A facility to allow all data exchanges to be encrypted should be
        !           121: present.

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