HP-UX Reference (11i v1 00/12) - 1M System Administration Commands N-Z (vol 4)
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STANDARD Printed by: Nora Chuang [nchuang] STANDARD
/build/1111/BRICK/man1m/naaagt.1m
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r
rlogind(1M) rlogind(1M)
NAME
rlogind - remote login server
SYNOPSIS
/usr/lbin/rlogind [-lns ][-B bannerfile]
DESCRIPTION
rlogind is the server for the rlogin(1) program. It provides a remote login facility with authentication
based on privileged port numbers. rlogind expects to be executed by the Internet daemon (inetd(1M))
when it receives a service request at the port indicated in the services database for login using the tcp
protocol (see services(4)).
When a service request is received, the following protocol is initiated by rlogind:
1. rlogind checks the client’s source port. If the port is not in the range 512 through 1023 (a
‘‘privileged port’’), the server aborts the connection.
2. rlogind checks the client’s source address and requests the corresponding host name (see
gethostent(3N), hosts(4), and named(1M)). If it cannot determine the hostname, it uses the Inter-
net dot-notation representation of the host address.
Once the source port and address have been checked,
rlogind proceeds with the authentication process
described in hosts.equiv(4).
rlogind then allocates a STREAMS based pseudo-terminal (see ptm(7),
pts(7)), and manipulates file descriptors so that the slave half of the pseudo-terminal becomes
stdin,
stdout, and stderr for a login process. The login process is an instance of login(1) invoked with the
-f
option if authentication has succeeded. If automatic authentication fails, login(1) prompts the user with
the normal login sequence.
Options
The
rlogind command supports the following options:
-l This option is used to prevent any authentication based on the user’s
.rhosts file unless
the user is logging in as super-user.
-s This option is used in multi-homed NIS systems. It disables rlogind from doing a
reverse lookup, of the client’s IP address; see gethostbyname(3N). It can be used to circum-
vent an NIS limitation with multihomed hosts.
-n This option is used to disable transport-level keepalive messages.
-B bannerfile
This option is used to display the file bannerfile to incoming rlogin requests.
The
rlogind process manipulates the master side of the pseudo-terminal, operating as an intermediary
between the login process and the client instance of the rlogin program. The protocol described in
ptm(7) and pts(7) is used to enable and disable flow control via Ctrl-S/Ctrl-Q under the direction of the pro-
gram running on the slave side of the pseudo-terminal, and to flush terminal output in response to inter-
rupt signals. The login process sets the baud rate and TERM environment variable to correspond to the
client’s baud rate and terminal type (see environ(5)).
Transport-level keepalive messages are enabled unless the
-n option is present. The use of keepalive mes-
sages allows sessions to be timed out if the client crashes or becomes unreachable.
To start
rlogind from the Internet daemon, the configuration file /etc/inetd.conf
must contain an
entry as follows:
login stream tcp nowait root /usr/lbin/rlogind rlogind
EXTERNAL INFLUENCES
International Code Set Support
Single- and multibyte character code sets are supported.
DIAGNOSTICS
Errors in establishing a connection cause an error message to be returned with a leading byte of 1 through
the socket connection, after which the network connection is closed. Any errors generated by the login pro-
cess or its descendents are passed through by the server as normal communication.
fork: No more processes
The server was unable to fork a process to handle the incoming connection.
HP-UX Release 11i: December 2000 − 1 − Section 1M−−715
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