125 lines
3.7 KiB
Groff
125 lines
3.7 KiB
Groff
.\" Copyright (c) 1996-1999 Whistle Communications, Inc.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Subject to the following obligations and disclaimer of warranty, use and
|
|
.\" redistribution of this software, in source or object code forms, with or
|
|
.\" without modifications are expressly permitted by Whistle Communications;
|
|
.\" provided, however, that:
|
|
.\" 1. Any and all reproductions of the source or object code must include the
|
|
.\" copyright notice above and the following disclaimer of warranties; and
|
|
.\" 2. No rights are granted, in any manner or form, to use Whistle
|
|
.\" Communications, Inc. trademarks, including the mark "WHISTLE
|
|
.\" COMMUNICATIONS" on advertising, endorsements, or otherwise except as
|
|
.\" such appears in the above copyright notice or in the software.
|
|
.\"
|
|
.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
|
|
.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
|
|
.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
|
|
.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
|
|
.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
|
|
.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
|
|
.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
|
|
.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
|
|
.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
|
|
.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
|
|
.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
|
|
.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
|
|
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
.\" THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
|
|
.\" OF SUCH DAMAGE.
|
|
.\"
|
|
.\" Author: Archie Cobbs <archie@whistle.com>
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\" $Whistle: ng_tee.8,v 1.4 1999/01/25 23:46:27 archie Exp $
|
|
.\"
|
|
.Dd January 19, 1999
|
|
.Dt NG_TEE 8
|
|
.Os FreeBSD
|
|
.Sh NAME
|
|
.Nm ng_tee
|
|
.Nd netgraph ``tee'' node type
|
|
.Sh SYNOPSIS
|
|
.Fd #include <netgraph/ng_tee.h>
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm tee
|
|
node type has a purpose similar to the
|
|
.Xr tee 1
|
|
command.
|
|
.Nm Tee
|
|
nodes are useful for debugging or
|
|
.Dq snooping
|
|
on a connection
|
|
between two netgraph nodes.
|
|
.Nm Tee
|
|
nodes have four hooks,
|
|
.Dv right ,
|
|
.Dv left ,
|
|
.Dv right2left ,
|
|
and
|
|
.Dv left2right .
|
|
All data received on
|
|
.Dv right
|
|
is sent unmodified to
|
|
.Em both
|
|
hooks
|
|
.Dv left
|
|
and
|
|
.Dv right2left .
|
|
Similarly, all data received on
|
|
.Dv left
|
|
is sent unmodified to both
|
|
.Dv right
|
|
and
|
|
.Dv left2right .
|
|
.Pp
|
|
Packets may also be received on
|
|
.Dv right2left
|
|
and
|
|
.Dv left2right ;
|
|
if so, they are forwarded unchanged out hooks
|
|
.Dv left
|
|
and
|
|
.Dv right ,
|
|
respectively.
|
|
.Sh HOOKS
|
|
This node type supports the following hooks:
|
|
.Pp
|
|
.Bl -tag -width foobarbarfoo
|
|
.It Dv right
|
|
The connection to the node on the right.
|
|
.It Dv left
|
|
The connection to the node on the left.
|
|
.It Dv right2left
|
|
Tap for right to left traffic.
|
|
.It Dv left2right
|
|
Tap for left to right traffic.
|
|
.El
|
|
.Sh CONTROL MESSAGES
|
|
This node type supports the generic control messages, plus the following.
|
|
.Bl -tag -width foo
|
|
.It Dv NGM_TEE_GET_STATS
|
|
Get statistics, returned as a
|
|
.Dv "struct ng_tee_stats" .
|
|
.It Dv NGM_TEE_CLR_STATS
|
|
Clear statistics.
|
|
.El
|
|
.Sh SHUTDOWN
|
|
This node shuts down upon receipt of a
|
|
.Dv NGM_SHUTDOWN
|
|
control message, or when all hooks have been disconnected.
|
|
.Sh SEE ALSO
|
|
.Xr tee 1 ,
|
|
.Xr netgraph 4 ,
|
|
.Xr ngctl 8 .
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
node type was implemented in
|
|
.Fx 4.0 .
|
|
.Sh AUTHORS
|
|
.An Julian Elischer Aq julian@whistle.com
|