module Mac

# File lib/macaddr.rb, line 59
def address
  return @mac_address if defined? @mac_address and @mac_address

  @mac_address = from_getifaddrs
  return @mac_address if @mac_address

  cmds = '/sbin/ifconfig', '/bin/ifconfig', 'ifconfig', 'ipconfig /all', 'cat /sys/class/net/*/address'

  output = nil
  cmds.each do |cmd|
    _, stdout, _ = systemu(cmd) rescue next
    next unless stdout and stdout.size > 0
    output = stdout and break
  end
  raise "all of #{ cmds.join ' ' } failed" unless output

  @mac_address = parse(output)
end

# File lib/macaddr.rb, line 33
def Mac.dependencies
  {
    'systemu' => [ 'systemu' , '~> 2.6.5' ]
  }
end

# File lib/macaddr.rb, line 39
def Mac.description
  'cross platform mac address determination for ruby'
end

# File lib/macaddr.rb, line 82
def from_getifaddrs
  return unless Socket.respond_to? :getifaddrs

  interfaces = Socket.getifaddrs.select do |addr|
    if addr.addr  # Some VPN ifcs don't have an addr - ignore them
      addr.addr.pfamily == INTERFACE_PACKET_FAMILY
    end
  end

  mac, =
    if Socket.const_defined? :PF_LINK then
      interfaces.map do |addr|
        addr.addr.getnameinfo
      end.find do |m,|
        !m.empty?
      end
    elsif Socket.const_defined? :PF_PACKET then
      interfaces.map do |addr|
        addr.addr.inspect_sockaddr[/hwaddr=([\h:]+)/, 1]
      end.find do |mac_addr|
        mac_addr != '00:00:00:00:00:00'
      end
    end

  @mac_address = mac if mac
end

# File lib/macaddr.rb, line 120
def list() @list end

# File lib/macaddr.rb, line 109
def parse(output)
  lines = output.split(/\n/)

  candidates = lines.select{|line| line =~ RE}
  raise 'no mac address candidates' unless candidates.first
  candidates.map!{|c| c[RE].strip}

  maddr = candidates.first
  raise 'no mac address found' unless maddr

  maddr.strip!
  maddr.instance_eval{ @list = candidates; def list() @list end }
  maddr
end

# File lib/macaddr.rb, line 29
def Mac.version
  ::Mac::VERSION
end