# File lib/ohai/plugins/sigar/network.rb, line 37
  def fetch_interfaces(sigar)
    iface = Mash.new
    net_counters = Mash.new

    sigar.net_interface_list.each do |cint|
      iface[cint] = Mash.new

      if cint =~ /^(\w+)(\d+.*)/
        iface[cint][:type] = $1
        iface[cint][:number] = $2
      end

      ifconfig = sigar.net_interface_config(cint)
      iface[cint][:encapsulation] = sigar_encaps_lookup(ifconfig.type)

      iface[cint][:addresses] = Mash.new
      # Backwards compat: loopback has no hwaddr
      if (ifconfig.flags & Sigar::IFF_LOOPBACK) == 0
        iface[cint][:addresses][ifconfig.hwaddr] = { "family" => "lladdr" }
      end
      if ifconfig.address != "0.0.0.0"
        iface[cint][:addresses][ifconfig.address] = { "family" => "inet" }
        # Backwards compat: no broadcast on tunnel or loopback dev
        if (((ifconfig.flags & Sigar::IFF_POINTOPOINT) == 0) &&
            ((ifconfig.flags & Sigar::IFF_LOOPBACK) == 0))
          iface[cint][:addresses][ifconfig.address]["broadcast"] = ifconfig.broadcast
        end
        iface[cint][:addresses][ifconfig.address]["netmask"] = ifconfig.netmask
      end

      if ifconfig.prefix6_length != 0
        iface[cint][:addresses][ifconfig.address6] = { "family" => "inet6" }
        iface[cint][:addresses][ifconfig.address6]["prefixlen"] = ifconfig.prefix6_length.to_s
        iface[cint][:addresses][ifconfig.address6]["scope"] = Sigar.net_scope_to_s(ifconfig.scope6)
      end

      iface[cint][:flags] = Sigar.net_interface_flags_to_s(ifconfig.flags).split(' ')
      iface[cint][:mtu] = ifconfig.mtu.to_s
      iface[cint][:queuelen] = ifconfig.tx_queue_len.to_s

      net_counters[cint] = Mash.new unless net_counters[cint]
      if (!cint.include?(":"))
        ifstat = sigar.net_interface_stat(cint)
        net_counters[cint][:rx] = { "packets" => ifstat.rx_packets.to_s, "errors"     => ifstat.rx_errors.to_s,
          "drop"    => ifstat.rx_dropped.to_s, "overrun"    => ifstat.rx_overruns.to_s,
          "frame"   => ifstat.rx_frame.to_s,   "bytes"      => ifstat.rx_bytes.to_s }
        net_counters[cint][:tx] = { "packets" => ifstat.tx_packets.to_s, "errors"     => ifstat.tx_errors.to_s,
          "drop"    => ifstat.tx_dropped.to_s, "overrun"    => ifstat.tx_overruns.to_s,
          "carrier" => ifstat.tx_carrier.to_s, "collisions" => ifstat.tx_collisions.to_s,
          "bytes"   => ifstat.tx_bytes.to_s }
      end
    end

    begin
      sigar.arp_list.each do |arp|
        next unless iface[arp.ifname] # this should never happen
        iface[arp.ifname][:arp] = Mash.new unless iface[arp.ifname][:arp]
        iface[arp.ifname][:arp][arp.address] = arp.hwaddr
      end
    rescue
      #64-bit AIX for example requires 64-bit caller
    end

    [iface, net_counters]
  end