#
# Author:: James Gartrell (<jgartrel@gmail.com>)
# Copyright:: Copyright (c) 2008-2016 Chef Software, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

Ohai.plugin(:Network) do
  provides "network", "network/interfaces"
  provides "counters/network", "counters/network/interfaces"

  def windows_encaps_lookup(encap)
    return "Ethernet" if encap.eql?("Ethernet 802.3")
    encap
  end

  collect_data(:windows) do

    require 'wmi-lite/wmi'

    iface = Mash.new
    iface_config = Mash.new
    iface_instance = Mash.new
    network Mash.new unless network
    network[:interfaces] = Mash.new unless network[:interfaces]
    counters Mash.new unless counters
    counters[:network] = Mash.new unless counters[:network]

    # http://msdn.microsoft.com/en-us/library/windows/desktop/aa394217%28v=vs.85%29.aspx
    wmi = WmiLite::Wmi.new

    adapters = wmi.instances_of('Win32_NetworkAdapterConfiguration')

    adapters.each do |adapter|

      i = adapter['index']
      iface_config[i] = Mash.new
      adapter.wmi_ole_object.properties_.each do |p|
        iface_config[i][p.name.wmi_underscore.to_sym] = adapter[p.name.downcase]
      end
    end

    # http://msdn.microsoft.com/en-us/library/windows/desktop/aa394216(v=vs.85).aspx

    adapters = wmi.instances_of('Win32_NetworkAdapter')

    adapters.each do |adapter|
      i = adapter['index']
      iface_instance[i] = Mash.new
      adapter.wmi_ole_object.properties_.each do |p|
        iface_instance[i][p.name.wmi_underscore.to_sym] = adapter[p.name.downcase]
      end
    end

    iface_instance.keys.each do |i|
      if iface_config[i][:ip_enabled] and iface_instance[i][:net_connection_id]
        cint = sprintf("0x%x", iface_instance[i][:interface_index] ? iface_instance[i][:interface_index] : iface_instance[i][:index] ).downcase
        iface[cint] = Mash.new
        iface[cint][:configuration] = iface_config[i]
        iface[cint][:instance] = iface_instance[i]

        iface[cint][:counters] = Mash.new
        iface[cint][:addresses] = Mash.new
        iface[cint][:configuration][:ip_address].each_index do |i|
          ip = iface[cint][:configuration][:ip_address][i]
          _ip = IPAddress("#{ip}/#{iface[cint][:configuration][:ip_subnet][i]}")
          iface[cint][:addresses][ip] = Mash.new(
                                                 :prefixlen => _ip.prefix
                                                 )
          if _ip.ipv6?
            # inet6 address
            iface[cint][:addresses][ip][:family] = "inet6"
            iface[cint][:addresses][ip][:scope] = "Link" if ip =~ /^fe80/i
          else
            # should be an inet4 address
            iface[cint][:addresses][ip][:netmask] =  _ip.netmask.to_s
            if iface[cint][:configuration][:ip_use_zero_broadcast]
              iface[cint][:addresses][ip][:broadcast] = _ip.network.to_s
            else
              iface[cint][:addresses][ip][:broadcast] = _ip.broadcast.to_s
            end
            iface[cint][:addresses][ip][:family] = "inet"
          end
        end
        # Apparently you can have more than one mac_address? Odd.
        [iface[cint][:configuration][:mac_address]].flatten.each do |mac_addr|
          iface[cint][:addresses][mac_addr] = {
            "family"    => "lladdr"
          }
        end
        iface[cint][:mtu] = iface[cint][:configuration][:mtu]
        iface[cint][:type] = iface[cint][:instance][:adapter_type]
        iface[cint][:arp] = {}
        iface[cint][:encapsulation] = windows_encaps_lookup(iface[cint][:instance][:adapter_type])
        if iface[cint][:configuration][:default_ip_gateway] != nil and iface[cint][:configuration][:default_ip_gateway].size > 0
          network[:default_gateway] = iface[cint][:configuration][:default_ip_gateway].first
          network[:default_interface] = cint
        end
      end
    end

    cint=nil
    so = shell_out("arp -a")
    if so.exitstatus == 0
      so.stdout.lines do |line|
        if line =~ /^Interface:\s+(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})\s+[-]+\s+(0x\S+)/
          cint = $2.downcase
        end
        next unless iface[cint]
        if line =~ /^\s+(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})\s+([a-fA-F0-9\:-]+)/
          iface[cint][:arp][$1] = $2.gsub("-",":").downcase
        end
      end
    end

    network["interfaces"] = iface
  end
end