NetBSD/usr.bin/rlogin/rlogin.1

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.\" $NetBSD: rlogin.1,v 1.19 2003/08/07 11:15:41 agc Exp $
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.\" @(#)rlogin.1 8.2 (Berkeley) 4/29/95
.\"
.Dd May 26, 2003
.Dt RLOGIN 1
.Os
.Sh NAME
.Nm rlogin
.Nd remote login
.Sh SYNOPSIS
.Nm
.Op Fl 8EKLdx
.Op Fl e Ar char
.Op Fl k Ar realm
.Op Fl l Ar username
.Op Fl p Ar port
.Ar host
.Nm
.Op Fl 8EKLdx
.Op Fl e Ar char
.Op Fl k Ar realm
.Op Fl p Ar port
.Ar username@host
.Sh DESCRIPTION
.Nm
starts a terminal session on a remote host
.Ar host .
.Pp
.Nm
first attempts to use the Kerberos authorization mechanism, described below.
If the remote host does not supporting Kerberos the standard Berkeley
.Em rhosts
authorization mechanism is used.
The options are as follows:
.Bl -tag -width XlXusernameX
.It Fl 8
The
.Fl 8
option allows an eight-bit input data path at all times; otherwise
parity bits are stripped except when the remote side's stop and start
characters are other than
.Sq \&^S/^Q .
.It Fl E
The
.Fl E
option stops any character from being recognized as an escape character.
When used with the
.Fl 8
option, this provides a completely transparent connection.
.It Fl K
The
.Fl K
option turns off all Kerberos authentication.
.It Fl L
The
.Fl L
option allows the rlogin session to be run in
.Dq litout
(see
.Xr tty 4 )
mode.
.It Fl d
The
.Fl d
option turns on socket debugging (see
.Xr setsockopt 2 )
on the TCP sockets used for communication with the remote host.
.It Fl e Ar char
The
.Fl e
option allows user specification of the escape character, which is
.Dq \&~
by default.
This specification may be as a literal character, or as an octal
value in the form \ennn.
.It Fl k Ar realm
The
.Fl k
option requests rlogin to obtain tickets for the remote host
in realm
.Ar realm
instead of the remote host's realm as determined by
.Xr krb_realmofhost 3 .
.It Fl l Ar username
the
.Fl l
option specifies an alternate
.Ar username
for the remote login.
If this option is not specified, your local username will be used.
.It Fl p Ar port
Uses the given
.Ar port
instead of the one assigned to the service
.Dq login .
May be given either as symbolic name or as number.
.It Fl x
The
.Fl x
option turns on
.Tn DES
encryption for all data passed via the rlogin session.
This may impact response time and
.Tn CPU
utilization, but provides increased security.
.El
.Pp
A line of the form
.Dq Ao escape char Ac Ns \&.
disconnects from the remote host.
Similarly, the line
.Dq Ao escape char Ac Ns ^Z
will suspend the
.Nm
session, and
.Dq Ao escape char Ac Ns Aq delayed-suspend char
suspends the
send portion of the rlogin, but allows output from the remote system.
By default, the tilde
.Pq Dq \&~
character is the escape character, and normally control-Y
.Pq Dq \&^Y
is the delayed-suspend character.
.Pp
All echoing takes place at the remote site, so that (except for delays) the
.Nm
is transparent.
Flow control via ^S/^Q and flushing of input and output on interrupts
are handled properly.
.Sh KERBEROS AUTHENTICATION
Each user may have a private authorization list in the file
.Pa .klogin
in their home directory.
Each line in this file should contain a Kerberos principal name of the form
.Ar principal.instance@realm .
If the originating user is authenticated to one of the principals named in
.Pa .klogin ,
access is granted to the account.
The principal
.Ar accountname.@localrealm
is granted access if there is no
.Pa .klogin
file.
Otherwise a login and password will be prompted for on the remote machine
as in
.Xr login 1 .
To avoid certain security problems, the
.Pa .klogin
file must be owned by the remote user.
.Pp
If Kerberos authentication fails, a warning message is printed and the
standard Berkeley
.Nm
is used instead.
.Sh ENVIRONMENT
The following environment variable is used by
.Nm :
.Bl -tag -width TERM
.It Ev TERM
Determines the user's terminal type.
.El
.Sh SEE ALSO
.Xr rcmd 1 ,
.Xr rsh 1 ,
.Xr krb_realmofhost 3 ,
.Xr krb_sendauth 3 ,
.Xr rcmd 3 ,
.Xr hosts.equiv 5 ,
.Xr rhosts 5 ,
.Xr environ 7 ,
.Xr kerberos 8
.Sh HISTORY
The
.Nm
command appeared in
.Bx 4.2 .
.Sh BUGS
More of the environment should be propagated.