freebsd-dev/usr.sbin/nghook/nghook.8
Philippe Charnier 490d5836b5 The .Nm utility
2002-07-14 14:47:15 +00:00

110 lines
3.4 KiB
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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:
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.\" 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
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.\" $FreeBSD$
.\" $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
The
.Nm
utility 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.
The
.Nm
utility 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.
The
.Nm
utility 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