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94 lines
3.4 KiB
Ruby
Executable File
94 lines
3.4 KiB
Ruby
Executable File
#!/usr/bin/env ruby
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# -------------------------------------------------------------------------- #
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# Copyright 2002-2011, OpenNebula Project Leads (OpenNebula.org) #
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# #
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# Licensed under the Apache License, Version 2.0 (the "License"); you may #
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# not use this file except in compliance with the License. You may obtain #
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# a copy of the License at #
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# #
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# http://www.apache.org/licenses/LICENSE-2.0 #
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# #
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# Unless required by applicable law or agreed to in writing, software #
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# distributed under the License is distributed on an "AS IS" BASIS, #
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. #
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# See the License for the specific language governing permissions and #
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# limitations under the License. #
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#--------------------------------------------------------------------------- #
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require 'rexml/document'
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#------------------------------------------------------------------------------
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# Configuration Options for the script. Change it to fit your installation
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#------------------------------------------------------------------------------
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CONF = {
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:ebtables => "sudo /sbin/ebtables",
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:brctl => "/usr/sbin/brctl",
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:virsh => "virsh -c qemu:///system"
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}
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#------------------------------------------------------------------------------
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#------------------------------------------------------------------------------
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# Applies a given rule to the ebtables
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#------------------------------------------------------------------------------
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def activate(rule)
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system "#{CONF[:ebtables]} -A #{rule}"
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end
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#------------------------------------------------------------------------------
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#------------------------------------------------------------------------------
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# Gets the interfaces attached to a given bridge
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#------------------------------------------------------------------------------
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def get_interfaces
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bridges = Hash.new
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brctl_exit =`#{CONF[:brctl]} show`
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cur_bridge = ""
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brctl_exit.split("\n")[1..-1].each do |l|
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l = l.split
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if l.length > 1
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cur_bridge = l[0]
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bridges[cur_bridge] = Array.new
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bridges[cur_bridge] << l[3]
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else
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bridges[cur_bridge] << l[0]
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end
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end
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bridges
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end
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#------------------------------------------------------------------------------
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###############################################################################
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# Main
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###############################################################################
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VM_NAME = ARGV[0]
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nets = `#{CONF[:virsh]} dumpxml #{VM_NAME}`
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doc = REXML::Document.new(nets).root
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interfaces = get_interfaces()
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doc.elements.each('/domain/devices/interface') {|net|
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tap = net.elements['target'].attributes['dev']
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if interfaces.include? tap
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iface_mac = net.elements['mac'].attributes['address']
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mac = iface_mac.split(':')
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mac[-1] = '00'
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net_mac = mac.join(':')
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in_rule="FORWARD -s ! #{net_mac}/ff:ff:ff:ff:ff:00 -o #{tap} -j DROP"
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out_rule="FORWARD -s ! #{iface_mac} -i #{tap} -j DROP"
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activate(in_rule)
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activate(out_rule)
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end
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}
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