265 lines
9.3 KiB
Python
265 lines
9.3 KiB
Python
#
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# CORE
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# Copyright (c)2011-2012 the Boeing Company.
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# See the LICENSE file included in this distribution.
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#
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# author: Jeff Ahrenholz <jeffrey.m.ahrenholz@boeing.com>
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#
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''' PhysicalNode class for including real systems in the emulated network.
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'''
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import os, threading, subprocess
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from core.misc.ipaddr import *
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from core.misc.utils import *
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from core.constants import *
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from core.api import coreapi
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from core.coreobj import PyCoreNode, PyCoreNetIf
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from core.emane.nodes import EmaneNode
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if os.uname()[0] == "Linux":
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from core.netns.vnet import LxBrNet
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from core.netns.vif import GreTap
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elif os.uname()[0] == "FreeBSD":
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from core.bsd.vnet import NetgraphNet
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class PhysicalNode(PyCoreNode):
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def __init__(self, session, objid = None, name = None,
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nodedir = None, verbose = False, start = True):
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PyCoreNode.__init__(self, session, objid, name, verbose=verbose,
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start=start)
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self.nodedir = nodedir
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self.up = start
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self.lock = threading.RLock()
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self._mounts = []
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if start:
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self.startup()
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def boot(self):
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self.session.services.bootnodeservices(self)
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def validate(self):
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self.session.services.validatenodeservices(self)
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def startup(self):
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self.lock.acquire()
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try:
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self.makenodedir()
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#self.privatedir("/var/run")
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#self.privatedir("/var/log")
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except OSError, e:
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self.exception(coreapi.CORE_EXCP_LEVEL_ERROR,
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"PhysicalNode.startup()", e)
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finally:
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self.lock.release()
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def shutdown(self):
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if not self.up:
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return
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self.lock.acquire()
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while self._mounts:
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source, target = self._mounts.pop(-1)
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self.umount(target)
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for netif in self.netifs():
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netif.shutdown()
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self.rmnodedir()
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self.lock.release()
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def termcmdstring(self, sh = "/bin/sh"):
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''' The broker will add the appropriate SSH command to open a terminal
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on this physical node.
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'''
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return sh
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def cmd(self, args, wait = True):
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''' run a command on the physical node
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'''
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os.chdir(self.nodedir)
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try:
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if wait:
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# os.spawnlp(os.P_WAIT, args)
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subprocess.call(args)
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else:
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# os.spawnlp(os.P_NOWAIT, args)
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subprocess.Popen(args)
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except CalledProcessError, e:
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self.warn("cmd exited with status %s: %s" % (e, str(args)))
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def cmdresult(self, args):
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''' run a command on the physical node and get the result
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'''
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os.chdir(self.nodedir)
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# in Python 2.7 we can use subprocess.check_output() here
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tmp = subprocess.Popen(args, stdin = open(os.devnull, 'r'),
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stdout = subprocess.PIPE,
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stderr = subprocess.STDOUT)
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result, err = tmp.communicate() # err will always be None
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status = tmp.wait()
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return (status, result)
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def shcmd(self, cmdstr, sh = "/bin/sh"):
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return self.cmd([sh, "-c", cmdstr])
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def sethwaddr(self, ifindex, addr):
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''' same as SimpleLxcNode.sethwaddr()
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'''
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self._netif[ifindex].sethwaddr(addr)
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ifname = self.ifname(ifindex)
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if self.up:
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(status, result) = self.cmdresult([IP_BIN, "link", "set", "dev",
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ifname, "address", str(addr)])
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if status:
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self.exception(coreapi.CORE_EXCP_LEVEL_ERROR,
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"PhysicalNode.sethwaddr()",
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"error setting MAC address %s" % str(addr))
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def addaddr(self, ifindex, addr):
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''' same as SimpleLxcNode.addaddr()
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'''
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if self.up:
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self.cmd([IP_BIN, "addr", "add", str(addr),
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"dev", self.ifname(ifindex)])
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self._netif[ifindex].addaddr(addr)
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def deladdr(self, ifindex, addr):
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''' same as SimpleLxcNode.deladdr()
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'''
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try:
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self._netif[ifindex].deladdr(addr)
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except ValueError:
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self.warn("trying to delete unknown address: %s" % addr)
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if self.up:
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self.cmd([IP_BIN, "addr", "del", str(addr),
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"dev", self.ifname(ifindex)])
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def adoptnetif(self, netif, ifindex, hwaddr, addrlist):
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''' The broker builds a GreTap tunnel device to this physical node.
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When a link message is received linking this node to another part of
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the emulation, no new interface is created; instead, adopt the
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GreTap netif as the node interface.
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'''
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netif.name = "gt%d" % ifindex
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netif.node = self
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self.addnetif(netif, ifindex)
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# use a more reasonable name, e.g. "gt0" instead of "gt.56286.150"
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if self.up:
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self.cmd([IP_BIN, "link", "set", "dev", netif.localname, "down"])
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self.cmd([IP_BIN, "link", "set", netif.localname, "name", netif.name])
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netif.localname = netif.name
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if hwaddr:
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self.sethwaddr(ifindex, hwaddr)
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for addr in maketuple(addrlist):
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self.addaddr(ifindex, addr)
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if self.up:
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self.cmd([IP_BIN, "link", "set", "dev", netif.localname, "up"])
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def linkconfig(self, netif, bw = None, delay = None,
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loss = None, duplicate = None, jitter = None, netif2 = None):
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''' Apply tc queing disciplines using LxBrNet.linkconfig()
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'''
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if os.uname()[0] == "Linux":
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netcls = LxBrNet
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elif os.uname()[0] == "FreeBSD":
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netcls = NetgraphNet
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else:
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raise NotImplementedError, "unsupported platform"
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# borrow the tc qdisc commands from LxBrNet.linkconfig()
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tmp = netcls(session=self.session, start=False)
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tmp.up = True
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tmp.linkconfig(netif, bw=bw, delay=delay, loss=loss,
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duplicate=duplicate, jitter=jitter, netif2=netif2)
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del tmp
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def newifindex(self):
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self.lock.acquire()
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try:
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while self.ifindex in self._netif:
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self.ifindex += 1
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ifindex = self.ifindex
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self.ifindex += 1
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return ifindex
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finally:
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self.lock.release()
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def newnetif(self, net = None, addrlist = [], hwaddr = None,
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ifindex = None, ifname = None):
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if self.up and net is None:
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raise NotImplementedError
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if ifindex is None:
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ifindex = self.newifindex()
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if self.up:
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# this is reached when this node is linked to a network node
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# tunnel to net not built yet, so build it now and adopt it
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gt = self.session.broker.addnettunnel(net.objid)
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if gt is None or len(gt) != 1:
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self.session.warn("Error building tunnel from PhysicalNode."
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"newnetif()")
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gt = gt[0]
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net.detach(gt)
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self.adoptnetif(gt, ifindex, hwaddr, addrlist)
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return ifindex
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# this is reached when configuring services (self.up=False)
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if ifname is None:
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ifname = "gt%d" % ifindex
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netif = GreTap(node = self, name = ifname, session = self.session,
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start = False)
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self.adoptnetif(netif, ifindex, hwaddr, addrlist)
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return ifindex
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def privatedir(self, path):
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if path[0] != "/":
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raise ValueError, "path not fully qualified: " + path
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hostpath = os.path.join(self.nodedir,
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os.path.normpath(path).strip('/').replace('/', '.'))
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try:
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os.mkdir(hostpath)
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except OSError:
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pass
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except Exception, e:
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raise Exception, e
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self.mount(hostpath, path)
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def mount(self, source, target):
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source = os.path.abspath(source)
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self.info("mounting %s at %s" % (source, target))
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try:
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os.makedirs(target)
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except OSError:
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pass
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try:
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self.cmd([MOUNT_BIN, "--bind", source, target])
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self._mounts.append((source, target))
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except:
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self.warn("mounting failed for %s at %s" % (source, target))
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def umount(self, target):
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self.info("unmounting '%s'" % target)
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try:
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self.cmd([UMOUNT_BIN, "-l", target])
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except:
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self.warn("unmounting failed for %s" % target)
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def opennodefile(self, filename, mode = "w"):
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dirname, basename = os.path.split(filename)
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if not basename:
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raise ValueError, "no basename for filename: " + filename
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if dirname and dirname[0] == "/":
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dirname = dirname[1:]
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dirname = dirname.replace("/", ".")
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dirname = os.path.join(self.nodedir, dirname)
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if not os.path.isdir(dirname):
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os.makedirs(dirname, mode = 0755)
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hostfilename = os.path.join(dirname, basename)
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return open(hostfilename, mode)
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def nodefile(self, filename, contents, mode = 0644):
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f = self.opennodefile(filename, "w")
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f.write(contents)
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os.chmod(f.name, mode)
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f.close()
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self.info("created nodefile: '%s'; mode: 0%o" % (f.name, mode))
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