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nghook(8)
NAME
nghook -- connect to a netgraph(4) node
SYNOPSIS
nghook [-adlnSs] [-m msg] path [hookname]
nghook -e [-n] [-m msg] path hookname program [args ...]
DESCRIPTION
The nghook utility creates a ng_socket(4) socket type node and connects
it to hook hookname of the node found at path. If hookname is omitted,
``debug'' is assumed.
If the -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 (spec-
ified by the -m option) are sent to the node. The program is executed
with its standard input (unless closed by -n) and output connected to the
hook.
If the -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 -m are sent to the node before the loop
is entered. The nghook utility exits when EOF is detected on standard
input in this case.
The options are as follows:
-a Output each packet read in human-readable decoded ASCII form
instead of raw binary.
-d Increase the debugging verbosity level.
-e Execute the program specified by the third argument.
-l Loops all received data back to the hook in addition to writing
it to standard output.
-m msg Before executing the program (in -e mode) send the given ASCII
control message to the node. This option may be given more than
once.
-n Do not attempt to read any data from standard input. The nghook
utility will continue reading from the node until stopped by a
signal.
-S Use file descriptor 0 for output instead of the default 1.
-s Use file descriptor 1 for input instead of the default 0.
BUGS
Although all input is read in unbuffered mode, there is no way to control
the packetization of the input.
If the node sends a response to a message (specified by -m), this
response is lost.
SEE ALSO
Archie Cobbs <archie@whistle.com>
FreeBSD 5.4 October 24, 2003 FreeBSD 5.4
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