Class: Vmit::BridgedNetwork

Inherits:
Network show all
Defined in:
lib/vmit/network.rb

Overview

Implementation of networking with a bridge with optional NAT to the host interface.

Constant Summary collapse

DEFAULT_NETWORK = 
'192.168.58.254/24'

Instance Attribute Summary

Attributes inherited from RefcountedResource

#lockfile_dir, #lockfile_path, #name

Instance Method Summary collapse

Methods inherited from Network

create, default, from_alias, from_config, #resource_class

Methods inherited from RefcountedResource

#auto, make_temp, #resource_class

Constructor Details

#initialize(address) ⇒ BridgedNetwork

Returns a new instance of BridgedNetwork.



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# File 'lib/vmit/network.rb', line 75

def initialize(address)
  @address = IPAddress(address).network
  brdevice = 'br0'
  @brdevice = brdevice
  super("#{@brdevice}-#{@address.to_u32}")
end

Instance Method Details

#connect_interface(device) ⇒ Object 



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# File 'lib/vmit/network.rb', line 107

def connect_interface(device)
  Vmit.logger.info "    Connecting #{device} --> #{@brdevice}"
  #Vmit::Utils.run_command(*['ovs-vsctl', 'add-port', SWITCH, ARGV[0]])
  Cheetah.run '/sbin/brctl', 'addif', @brdevice, device
end

#disconnect_interface(device) ⇒ Object

reimplemented from RefcountedResource



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# File 'lib/vmit/network.rb', line 125

def disconnect_interface(device)
  Vmit.logger.info "    Disconnecting #{device} -X-> #{@brdevice}"
  #Vmit::Utils.run_command(*['ovs-vsctl', 'del-port', SWITCH, ARGV[0]])
  Cheetah.run '/sbin/brctl', 'delif', @brdevice, device
end

#dnsmasq_pid ⇒ Object 



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# File 'lib/vmit/network.rb', line 151

def dnsmasq_pid
  File.read(dnsmasq_pidfile).strip.to_i
end

#dnsmasq_pidfile ⇒ Object 



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# File 'lib/vmit/network.rb', line 155

def dnsmasq_pidfile
  File.join(lockfile_dir, 'dnsmasq.pid')
end

#kill_dnsmasq ⇒ Object 



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# File 'lib/vmit/network.rb', line 146

def kill_dnsmasq
  Vmit.logger.info "Killing dnsmasq (#{dnsmasq_pid})"
  Process.kill('SIGTERM', dnsmasq_pid)
end

#on_acquire ⇒ Object

reimplemented from RefcountedResource



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# File 'lib/vmit/network.rb', line 132

def on_acquire
end

#on_down ⇒ Object

reimplemented from RefcountedResource



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# File 'lib/vmit/network.rb', line 114

def on_down
  Vmit.logger.info "Bringing down bridged network #{@address.to_string} on #{@brdevice}"
  Vmit.logger.info "  `-> managed by #{lockfile_path}"
  Cheetah.run '/sbin/ifconfig', @brdevice, 'down'
  Cheetah.run '/sbin/brctl', 'delbr', @brdevice
  Cheetah.run 'iptables', '-t', 'nat', '-D', 'POSTROUTING', '-s', @address.network.to_string,
    '!', '-d', @address.network.to_string, '-j', 'MASQUERADE'
  kill_dnsmasq
end

#on_release ⇒ Object

reimplemented from RefcountedResource



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# File 'lib/vmit/network.rb', line 136

def on_release
end

#on_up ⇒ Object

reimplemented from RefcountedResource



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# File 'lib/vmit/network.rb', line 87

def on_up
  Vmit.logger.info "Bringing up bridged network #{@address.to_string} on #{@brdevice}"
  Vmit.logger.info "  `-> managed by #{lockfile_path}"
  # setup bridge
  # may be use 'ip', 'link', 'show', 'dev', devname to check if
  # the bridge is there?
  Cheetah.run '/sbin/brctl', 'addbr', @brdevice
  File.write("/proc/sys/net/ipv6/conf/#{@brdevice}/disable_ipv6", 1)
  File.write('/proc/sys/net/ipv4/ip_forward', 1)
  Cheetah.run '/sbin/brctl', 'stp', @brdevice, 'on'
  #Cheetah.run '/sbin/brctl', 'setfd', @brdevice, '0' rescue nil
  # setup network and dhcp on bridge
  Cheetah.run '/sbin/ifconfig', @brdevice, @address.network.hosts[0].to_s
  Cheetah.run '/sbin/ifconfig', @brdevice, 'up'
  Cheetah.run 'iptables', '-t', 'nat', '-A', 'POSTROUTING', '-s', @address.network.to_string,
    '!', '-d', @address.network.to_string, '-j', 'MASQUERADE'

  start_dnsmasq
end

#start_dnsmasq ⇒ Object 



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# File 'lib/vmit/network.rb', line 139

def start_dnsmasq
  dnsmasq_args = %W(dnsmasq -Z -x #{dnsmasq_pidfile} --strict-order --bind-interfaces --listen-address #{@address.network.hosts[0]} --dhcp-range #{@address.network.hosts[1]},#{@address.network.hosts.last})
  Vmit.logger.debug "dnsmasq arguments: '#{dnsmasq_args.join(' ')}'"
  IO.popen(dnsmasq_args)
  #Vmit.logger.info "  dnsmasq spawned with pid #{dnsmasq_pid}"
end

#to_s ⇒ Object 



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# File 'lib/vmit/network.rb', line 82

def to_s
  "#{@brdevice}:#{@address.to_string}"
end