freebsd-dev/usr.sbin/nghook/nghook.8
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.\" 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.
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.\" 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
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.\" OF SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\" $Whistle: nghook.8,v 1.4 1999/01/20 03:19:45 archie Exp $
.\"
.Dd January 19, 1999
.Dt NGHOOK 8
.Os
.Sh NAME
.Nm nghook
.Nd connect to a
.Xr netgraph 4
node
.Sh SYNOPSIS
.Nm
.Op Fl a
.Op Fl d
.Op Fl l
.Op Fl n
.Ar path
.Op Ar hookname
.Sh DESCRIPTION
.Nm
creates a
.Xr ng_socket 4
socket type node and connects it to hook
.Ar hookname
of the node found at
.Ar path .
If
.Ar hookname
is omitted,
.Dq debug
is assumed.
.Pp
At this point all data written to standard input is sent
to the node and all data received from the node is relayed
to standard output.
.Nm
exits when
.Dv EOF
is detected on standard input.
.Pp
The options are as follows:
.Pp
.Bl -tag -width indent
.It Fl a
Output each packet read in human-readable decoded
.Tn ASCII
form instead of raw binary.
.It Fl d
Increase the debugging verbosity level.
.It Fl l
Loops all received data back to the hook in addition to writing it
to standard output.
.It Fl n
Don't attempt to read any data from standard input.
.Nm
will continue reading from the node until stopped by a signal.
.El
.Sh BUGS
Although all input is read in unbuffered mode,
there's no way to control the packetization of the input.
.Sh SEE ALSO
.Xr netgraph 3 ,
.Xr netgraph 4 ,
.Xr ngctl 8
.Sh HISTORY
The
.Em netgraph
system was designed and first implemented at Whistle Communications, Inc.\&
in a version of
.Fx 2.2
customized for the Whistle InterJet.
.Sh AUTHORS
.An Archie Cobbs Aq archie@whistle.com