272 lines
7.5 KiB
Groff
272 lines
7.5 KiB
Groff
.\" Copyright (c) 1986, 1991 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)slattach.8 6.4 (Berkeley) 3/16/91
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.\"
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.\" $FreeBSD$
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.\"
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.Dd April 4, 1993
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.Dt SLATTACH 8
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.Os
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.Sh NAME
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.Nm slattach
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.Nd attach serial lines as network interfaces
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.Sh SYNOPSIS
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.Nm
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.Op Fl acfhLlnz
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.Op Fl e Ar exit-command
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.Op Fl K Ar keepalive
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.Op Fl O Ar outfill
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.Op Fl r Ar redial-command
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.Op Fl S Ar unit
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.Op Fl s Ar baudrate
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.Op Fl u Ar unit-command
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.Ar ttyname
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.Sh DESCRIPTION
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The
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.Nm
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utility is used to assign a tty line to a network interface,
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and to define the network source and destination addresses.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl a
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Autoenable the VJ header compression option, if the other end of the link
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is capable of VJ header compression then it will be used otherwise normal
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headers will be used.
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.It Fl c
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Enable the VJ header compression option.
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Note that both ends of the link
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must be able to use VJ header compression for this to work.
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.It Fl e Ar exit-command
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Specify a command to be invoked within a shell
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.Ql sh \-c Ar exit-command
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before
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.Nm
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exits.
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.It Fl f
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Disable the invocation of daemon() to run
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.Nm
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in the background.
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.It Fl h
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Turn on cts/rts style flow control on the slip port, by default no flow
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control is done.
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.It Fl l
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Disable modem control (CLOCAL) and ignore carrier detect on the slip
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port.
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By default the
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.Ar redial-command
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is invoked upon carrier drop and
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.Nm
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aborts if no
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.Ar redial-command
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is specified.
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.It Fl n
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Throw away ICMP packets.
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The slip interface will ignore ICMP packets
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to prevent slow lines being saturated by ICMP responses.
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.It Fl r Ar redial-command
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Specify a command to be invoked within a shell
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.Ql sh \-c Ar redial-command
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whenever carrier is lost on the modem line.
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Empty
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.Ar redial-command
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(i.e.\&
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.Fl r Qq "" )
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cause connection reestablishing on leased line
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without any external command invoked.
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.It Fl s Ar baudrate
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Specify the speed of the connection.
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If not specified, the
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default of 9600 is used.
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.It Fl u Ar unit-command
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When the line is switched to slip discipline, run
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.Dq Nm "sh -c" Ar unit-command old new
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where
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.Ar old
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and
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.Ar new
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are the slip unit numbers when the line was
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last opened and the unit number of the current slip connection
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respectively.
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The unit number can change after redialing if you are
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using more than one slip line.
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When
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.Nm
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is connected for the first time,
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.Dq Nm "sh -c" Ar unit-command \-1 new
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is run.
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When
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.Nm
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is disconnected,
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.Dq Nm "sh -c" Ar unit-command old \-1
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is run.
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The
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.Nm
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utility will abort if the unit number
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changes and
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.Dq Fl u Ar \%unit-command
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was not specified.
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.It Fl z
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Force redial
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.Ar redial-command
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upon startup irrespective of carrier.
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.It Fl L
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Use uucp-style device locking.
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You need it unless you start
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.Nm
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from external program which already does uucp locking.
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Default case is no uucp locking to satisfy such programs.
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.It Fl K Ar keepalive
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Set SLIP "keep alive" timeout in seconds.
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If FRAME_END is not received in
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this amount of time, re-connect occurs.
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The default value is no timeout.
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.It Fl O Ar outfill
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Set SLIP "out fill" timeout in seconds.
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It forces at least one FRAME_END
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to be sent during this time period, which is necessary for the "keep alive"
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timeout on the remote side.
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The default value is no timeout.
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.It Fl S Ar unit
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Set the SLIP unit number directly.
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Use with caution, because no check is made
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for two interfaces with same number.
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By default sliplogin dynamically assigns the unit number.
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.It Ar ttyname
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Specify the name of the tty device.
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.Ar Ttyname
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should be a string of the form
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.Ql ttyXX
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or
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.Ql /dev/ttyXX .
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.El
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.Pp
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Only the super-user may attach a network interface.
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.Pp
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To detach the interface, use
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.Dq Li ifconfig interface-name down
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after killing off the
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.Nm
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process using
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.Ql kill -INT .
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.Ar Interface-name
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is the name that is shown by
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.Xr netstat 1 .
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.Pp
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To setup
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.Nm
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to redial the phone when carrier is lost, use the
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.Fl r Ar redial-command
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option to specify a script or executable that will reconnect the
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serial line to the slip server.
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For example, the script could redial
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the server and log in, etc.
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.Pp
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To reconfigure the network interface in case the slip unit number
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changes, use the
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.Fl u Ar unit-command
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option to specify a script or executable that will be invoked as
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.Ql sh \-c Ar unit-command old new
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where
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.Ar old
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and
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.Ar new
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are the slip unit numbers before and after
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reconnecting the line.
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The unit number can change if you have more
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than one line disconnect at the same time.
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The first to succeed in
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reconnecting will get the lowest unit number.
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.Pp
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To kill
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.Nm
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use
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.Ql kill -INT
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(SIGINT) which causes it to close the tty and exit.
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.Pp
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To force a redial, use
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.Ql kill -HUP
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(SIGHUP) which causes
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.Nm
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to think carrier was lost and thus invoke
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.Ql sh \-c Ar redial-command
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to reconnect to the server.
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.Pp
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If you use a hard-wired connection rather than a modem, invoke
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.Nm
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with the
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.Fl l
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option in order to ignore carrier on the slip line.
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.Sh FILES
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.Bl -tag -width /usr/share/examples/slattach/* -compact
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.It Pa /var/run/slattach.<tty>.pid
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with
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.Ar tty
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replaced by the terminal path name component of
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.Ar ttyname .
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This file contains the numerical process ID of the
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.Nm
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process and can be examined by scripts in order to send a signal to
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.Nm
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.It Pa /usr/share/examples/slattach/*
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.El
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.Sh EXAMPLES
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.Bd -literal -offset indent -compact
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slattach ttyd8
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slattach \-s 4800 /dev/ttyd1
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slattach \-c \-s 38400 /dev/cuad1
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slattach \-r 'kermit -y dial.script >kermit.log 2>&1'
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.Ed
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.Sh DIAGNOSTICS
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Look for error messages in
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.Pa /var/log/messages
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.No ( Nm
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is a daemon).
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Messages indicating the specified interface does not exit, the
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requested address is unknown, the user is not privileged and tried to
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alter an interface's configuration are logged there.
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The
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.Nm
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utility
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also logs failure to set the controlling terminal or failure to install
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signal handlers.
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Upon connection and redial the ttyname and baud rate
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are logged and on shutdown the ttyname is logged.
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.Sh SEE ALSO
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.Xr netstat 1 ,
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.Xr startslip 1 ,
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.Xr netintro 4 ,
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.Xr ifconfig 8 ,
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.Xr rc 8 ,
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.Xr sliplogin 8
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.Sh HISTORY
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The
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.Nm
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utility appeared in
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.Bx 4.3 .
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