73 lines
2.2 KiB
Python
73 lines
2.2 KiB
Python
#
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# CORE
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# Copyright (c)2010-2012 the Boeing Company.
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# See the LICENSE file included in this distribution.
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#
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# authors: core-dev@pf.itd.nrl.navy.mil
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#
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"""
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netgraph.py: Netgraph helper functions; for now these are wrappers around
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ngctl commands.
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"""
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import subprocess
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from core import constants
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from core.misc import utils
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utils.checkexec([constants.NGCTL_BIN])
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def createngnode(type, hookstr, name=None):
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"""
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Create a new Netgraph node of type and optionally assign name. The
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hook string hookstr should contain two names. This is a string so
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other commands may be inserted after the two names.
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Return the name and netgraph ID of the new node.
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"""
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hook1 = hookstr.split()[0]
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ngcmd = "mkpeer %s %s \n show .%s" % (type, hookstr, hook1)
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cmd = [constants.NGCTL_BIN, "-f", "-"]
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cmdid = subprocess.Popen(cmd, stdin=subprocess.PIPE,
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT)
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# err will always be None
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result, err = cmdid.communicate(input=ngcmd)
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status = cmdid.wait()
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if status > 0:
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raise Exception("error creating Netgraph node %s (%s): %s" % (type, ngcmd, result))
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results = result.split()
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ngname = results[1]
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ngid = results[5]
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if name:
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utils.check_call([constants.NGCTL_BIN, "name", "[0x%s]:" % ngid, name])
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return ngname, ngid
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def destroyngnode(name):
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""" Shutdown a Netgraph node having the given name.
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"""
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utils.check_call([constants.NGCTL_BIN, "shutdown", "%s:" % name])
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def connectngnodes(name1, name2, hook1, hook2):
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""" Connect two hooks of two Netgraph nodes given by their names.
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"""
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node1 = "%s:" % name1
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node2 = "%s:" % name2
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utils.check_call([constants.NGCTL_BIN, "connect", node1, node2, hook1, hook2])
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def ngmessage(name, msg):
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""" Send a Netgraph message to the node named name.
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"""
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cmd = [constants.NGCTL_BIN, "msg", "%s:" % name] + msg
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utils.check_call(cmd)
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def ngloadkernelmodule(name):
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""" Load a kernel module by invoking kldstat. This is needed for the
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ng_ether module which automatically creates Netgraph nodes when loaded.
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"""
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utils.mutecall(["kldload", name])
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