netgraph control utility
utility creates a new netgraph node
of type socket
which can be used to issue
netgraph commands. If no
flag is given,
no command is supplied on the command line, and standard input is a tty,
will enter interactive mode.
will execute the supplied
command(s) and exit immediately.
Nodes can be created, removed, joined together, etc. ASCII formatted control
messages can be sent to any node if that node supports binary/ASCII control
In interactive mode,
will display any
control messages and data packets received by the socket node. In the case of
control messages, the message arguments are displayed in ASCII form if the
originating node supports conversion.
The options are as follows:
- Read commands from the named file. A single dash represents the standard
input. Blank lines and lines starting with a “#” are
- Assign nodename to the newly created netgraph
node. The default name is ngctlXXX where XXX
is the process ID number.
- Increase the debugging verbosity level.
The currently supported commands in
config get or set configuration of node at <path>
connect Connects hook <peerhook> of the node at <relpath> to <hook>
debug Get/set debugging verbosity level
dot Produce a GraphViz (.dot) of the entire netgraph.
help Show command summary or get more help on a specific command
list Show information about all nodes
mkpeer Create and connect a new node to the node at "path"
msg Send a netgraph control message to the node at "path"
name Assign name <name> to the node at <path>
read Read and execute commands from a file
rmhook Disconnect hook "hook" of the node at "path"
show Show information about the node at <path>
shutdown Shutdown the node at <path>
status Get human readable status information from the node at <path>
types Show information about all installed node types
write Send a data packet down the hook named by "hook".
quit Exit program
Some commands have aliases, e.g., “ls” is the same as
“list”. The “help” command displays the available
commands, their usage and aliases, and a brief description.
utility exits 0 on success,
and >0 if an error occurs.
system was designed and first
implemented at Whistle Communications, Inc. in a version of
customized for the Whistle InterJet.