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144 lines
4.4 KiB
Groff
144 lines
4.4 KiB
Groff
.\" Copyright (c) 1996-1999 Whistle Communications, Inc.
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.\" All rights reserved.
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.\"
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.\" Subject to the following obligations and disclaimer of warranty, use and
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.\" redistribution of this software, in source or object code forms, with or
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.\" without modifications are expressly permitted by Whistle Communications;
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.\" provided, however, that:
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.\" 1. Any and all reproductions of the source or object code must include the
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.\" copyright notice above and the following disclaimer of warranties; and
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.\" 2. No rights are granted, in any manner or form, to use Whistle
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.\" Communications, Inc. trademarks, including the mark "WHISTLE
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.\" COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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.\" such appears in the above copyright notice or in the software.
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.\"
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.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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.\" OF SUCH DAMAGE.
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.\" $Whistle: nghook.8,v 1.4 1999/01/20 03:19:45 archie Exp $
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.\"
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.Dd October 24, 2003
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.Dt NGHOOK 8
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.Os
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.Sh NAME
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.Nm nghook
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.Nd connect to a
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.Xr netgraph 4
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node
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.Sh SYNOPSIS
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.Nm
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.Op Fl adlnSs
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.Op Fl m Ar msg
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.Ar path
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.Op Ar hookname
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.Nm
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.Fl e
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.Op Fl n
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.Op Fl m Ar msg
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.Ar path
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.Ar hookname
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.Ar program
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.Op Ar args ...
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.Sh DESCRIPTION
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The
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.Nm
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utility creates a
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.Xr ng_socket 4
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socket type node and connects it to hook
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.Ar hookname
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of the node found at
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.Ar path .
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If
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.Ar hookname
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is omitted,
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.Dq Li debug
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is assumed.
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.Pp
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If the
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.Fl e
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option is given, the third argument is interpreted as the path to a program,
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and this program is executed with the remaining arguments as its arguments.
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Before executing, the program Netgraph messages (specified by the
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.Fl m
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option) are sent to the node.
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The program is executed with its standard input (unless closed by
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.Fl n )
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and output connected to the hook.
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.Pp
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If the
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.Fl e
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option is not given, all data written to standard input is sent
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to the node, and all data received from the node is relayed
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to standard output.
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Messages specified with
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.Fl m
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are sent to the node before the loop is entered.
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The
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.Nm
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utility exits when
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.Dv EOF
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is detected on standard input in this case.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl a
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Output each packet read in human-readable decoded
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.Tn ASCII
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form instead of raw binary.
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.It Fl d
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Increase the debugging verbosity level.
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.It Fl e
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Execute the program specified by the third argument.
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.It Fl l
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Loops all received data back to the hook in addition to writing it
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to standard output.
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.It Fl m Ar msg
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Before executing the program (in
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.Fl e
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mode) send the given ASCII control message to the node.
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This option may be given more than once.
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.It Fl n
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Do not attempt to read any data from standard input.
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The
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.Nm
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utility will continue reading from the node until stopped by a signal.
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.It Fl S
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Use file descriptor 0 for output instead of the default 1.
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.It Fl s
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Use file descriptor 1 for input instead of the default 0.
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.El
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.Sh SEE ALSO
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.Xr netgraph 3 ,
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.Xr netgraph 4 ,
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.Xr ngctl 8
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.Sh HISTORY
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The
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.Nm netgraph
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system was designed and first implemented at Whistle Communications, Inc.\&
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in a version of
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.Fx 2.2
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customized for the Whistle InterJet.
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.Sh AUTHORS
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.An Archie Cobbs Aq Mt archie@whistle.com
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.Sh BUGS
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Although all input is read in unbuffered mode,
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there is no way to control the packetization of the input.
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.Pp
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If the node sends a response to a message (specified by
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.Fl m ) ,
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this response is lost.
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