BSD 4_3_Reno release

[unix-history] / usr / src / libexec / rlogind / rlogind.8

diff --git a/usr/src/libexec/rlogind/rlogind.8 b/usr/src/libexec/rlogind/rlogind.8
index db0d13c..c094033 100644 (file)
--- a/usr/src/libexec/rlogind/rlogind.8
+++ b/usr/src/libexec/rlogind/rlogind.8
@@ -1,24 +1,37 @@
-.\" Copyright (c) 1983 Regents of the University of California.
-.\" All rights reserved.  The Berkeley software License Agreement
-.\" specifies the terms and conditions for redistribution.
+.\" Copyright (c) 1983, 1989 The Regents of the University of California.
+.\" All rights reserved.

 .\"
 .\"

-.\"    @(#)rlogind.8   5.1 (Berkeley) %G%
+.\" Redistribution and use in source and binary forms are permitted provided
+.\" that: (1) source distributions retain this entire copyright notice and
+.\" comment, and (2) distributions including binaries display the following
+.\" acknowledgement:  ``This product includes software developed by the
+.\" University of California, Berkeley and its contributors'' in the
+.\" documentation or other materials provided with the distribution and in
+.\" all advertising materials mentioning features or use of this software.
+.\" Neither the name of the University nor the names of its contributors may
+.\" be used to endorse or promote products derived from this software without
+.\" specific prior written permission.
+.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

 .\"
 .\"

-.TH RLOGIND 8C "4 March 1983"
+.\"    @(#)rlogind.8   6.11 (Berkeley) 6/24/90
+.\"
+.TH RLOGIND 8 "June 24, 1990"

 .UC 5
 .SH NAME
 rlogind \- remote login server
 .SH SYNOPSIS
 .UC 5
 .SH NAME
 rlogind \- remote login server
 .SH SYNOPSIS

-.B /etc/rlogind
+.B rlogind

 [
 [

-.B \-d
+.B \-aln

 ]
 .SH DESCRIPTION
 .I Rlogind
 is the server for the 
 ]
 .SH DESCRIPTION
 .I Rlogind
 is the server for the 

-.IR rlogin (1C)
+.IR rlogin (1)

 program.  The server provides a remote login facility
 program.  The server provides a remote login facility

-with authentication based on privileged port numbers.
+with authentication based on privileged port numbers from trusted hosts.

 .PP
 .I Rlogind
 listens for service requests at the port indicated in
 .PP
 .I Rlogind
 listens for service requests at the port indicated in


@@ -28,18 +41,31 @@ When a service request is received the following protocol
 is initiated:
 .IP 1)
 The server checks the client's source port.
 is initiated:
 .IP 1)
 The server checks the client's source port.

-If the port is not in the range 0-1023, the server
+If the port is not in the range 512-1023, the server

 aborts the connection.
 .IP 2)
 aborts the connection.
 .IP 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 host name data base (see
-.IR hosts (5)),
-the server aborts the connection.
+The server checks the client's source address
+and requests the corresponding host name (see
+IR gethostbyaddr (3),
+.IR hosts (5)
+and
+.IR named (8)).
+If the hostname cannot be determined,
+the dot-notation representation of the host address is used.
+If the hostname is in the same domain as the server (according to
+the last two components of the domain name),
+or if the
+.B \-a
+option is given,
+the addresses for the hostname are requested,
+verifying that the name and address correspond.
+Normal authentication is bypassed if the address verification fails.

 .PP
 Once the source port and address have been checked, 
 .I rlogind
 .PP
 Once the source port and address have been checked, 
 .I rlogind

-allocates a pseudo terminal (see 
+proceeds with the authentication process described in
+.IR rshd (8).
+It then allocates a pseudo terminal (see 

 .IR pty (4)),
 and manipulates file descriptors so that the slave
 half of the pseudo terminal becomes the 
 .IR pty (4)),
 and manipulates file descriptors so that the slave
 half of the pseudo terminal becomes the 


@@ -51,15 +77,16 @@ for a login process.
 The login process is an instance of the
 .IR login (1)
 program, invoked with the
 The login process is an instance of the
 .IR login (1)
 program, invoked with the

-.B \-r
-option.  The login process then proceeds with the authentication
-process as described in
-.IR rshd (8C),
-but if automatic authentication fails, it reprompts the user
-to login as one finds on a standard terminal line.
+.B \-f
+option if authentication has succeeded.
+If automatic authentication fails, the user is
+prompted to log in as if on a standard terminal line.  The
+.B \-l
+option prevents any authentication based on the user's
+``.rhosts'' file, unless the user is logging in as the superuser.

 .PP
 The parent of the login process manipulates the master side of
 .PP
 The parent of the login process manipulates the master side of

-the pseduo terminal, operating as an intermediary
+the pseudo terminal, operating as an intermediary

 between the login process and the client instance of the
 .I rlogin
 program.  In normal operation, the packet protocol described
 between the login process and the client instance of the
 .I rlogin
 program.  In normal operation, the packet protocol described


@@ -70,27 +97,29 @@ 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
 .IR environ (7).
 propagates the client terminal's baud rate and terminal type,
 as found in the environment variable, ``TERM''; see
 .IR environ (7).

+The screen or window size of the terminal is requested from the client,
+and window size changes from the client are propagated to the pseudo terminal.
+.PP
+Transport-level keepalive messages are enabled unless the
+.B \-n
+option is present.
+The use of keepalive messages allows sessions to be timed out
+if the client crashes or becomes unreachable.

 .SH DIAGNOSTICS
 .SH DIAGNOSTICS

-All diagnostic messages are returned on the connection
-associated with the
-.BR stderr ,
+All initial diagnostic messages are indicated
+by a leading byte with a value of 1,

 after which any network connections are closed.
 after which any network connections are closed.

-An error is indicated by a leading byte with a value of 1.
-.PP
-.B ``Hostname for your address unknown.''
-.br
-No entry in the host name database existed for
-the client's machine.
+If there are no errors before
+.I login
+is invoked, a null byte is returned as in indication of success.

 .PP
 .B ``Try again.''
 .br
 A
 .I fork
 by the server failed.
 .PP
 .B ``Try again.''
 .br
 A
 .I fork
 by the server failed.

-.PP
-.B ``/bin/sh: ...''
-.br
-The user's login shell could not be started.
+.SH "SEE ALSO"
+login(1), ruserok(3), rshd(8)

 .SH BUGS
 The authentication procedure used here assumes the integrity
 of each client machine and the connecting medium.  This is
 .SH BUGS
 The authentication procedure used here assumes the integrity
 of each client machine and the connecting medium.  This is


@@ -98,3 +127,5 @@ insecure, but is useful in an ``open'' environment.
 .PP
 A facility to allow all data exchanges to be encrypted should be
 present.
 .PP
 A facility to allow all data exchanges to be encrypted should be
 present.

+.PP
+A more extensible protocol should be used.