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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.
-.\" 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.
-.\"
-.\" $FreeBSD$
-.\" $Whistle: nghook.8,v 1.4 1999/01/20 03:19:45 archie Exp $
-.\"
-.Dd October 24, 2003
-.Dt NGHOOK 8
-.Os
-.Sh NAME
-.Nm nghook
-.Nd connect to a
-.Xr netgraph 4
-node
-.Sh SYNOPSIS
-.Nm
-.Op Fl adlnSs
-.Op Fl m Ar msg
-.Ar path
-.Op Ar hookname
-.Nm
-.Fl e
-.Op Fl n
-.Op Fl m Ar msg
-.Ar path
-.Ar hookname
-.Ar program
-.Op Ar args ...
-.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 Li debug
-is assumed.
-.Pp
-If the
-.Fl e
-option is given, the third argument is interpreted as the path to a program,
-and this program is executed with the remaining arguments as its arguments.
-Before executing, the program Netgraph messages (specified by the
-.Fl m
-option) are sent to the node.
-The program is executed with its standard input (unless closed by
-.Fl n )
-and output connected to the hook.
-.Pp
-If the
-.Fl e
-option is not given, all data written to standard input is sent
-to the node, and all data received from the node is relayed
-to standard output.
-Messages specified with
-.Fl m
-are sent to the node before the loop is entered.
-The
-.Nm
-utility exits when
-.Dv EOF
-is detected on standard input in this case.
-.Pp
-The options are as follows:
-.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 e
-Execute the program specified by the third argument.
-.It Fl l
-Loops all received data back to the hook in addition to writing it
-to standard output.
-.It Fl m Ar msg
-Before executing the program (in
-.Fl e
-mode) send the given ASCII control message to the node.
-This option may be given more than once.
-.It Fl n
-Do not attempt to read any data from standard input.
-The
-.Nm
-utility will continue reading from the node until stopped by a signal.
-.It Fl S
-Use file descriptor 0 for output instead of the default 1.
-.It Fl s
-Use file descriptor 1 for input instead of the default 0.
-.El
-.Sh SEE ALSO
-.Xr netgraph 3 ,
-.Xr netgraph 4 ,
-.Xr ngctl 8
-.Sh HISTORY
-The
-.Nm 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
-.Sh BUGS
-Although all input is read in unbuffered mode,
-there is no way to control the packetization of the input.
-.Pp
-If the node sends a response to a message (specified by
-.Fl m ) ,
-this response is lost.