require 'rbsigar'

sigar = Sigar.new
iflist = sigar.net_interface_list

iflist.each do |ifname|
  ifconfig = sigar.net_interface_config(ifname)
  flags = ifconfig.flags
  encap = ifconfig.type

  hwaddr = ifconfig.hwaddr
  if hwaddr == Sigar::NULL_HWADDR
    hwaddr = ""
  else
    hwaddr = " HWaddr " + hwaddr
  end

  puts ifname + "\t" + "Link encap:" + encap + hwaddr

  if (flags & Sigar::IFF_POINTOPOINT) != 0
    ptp = "  P-t-P:" + ifconfig.destination
  else
    ptp = ""
  end

  if (flags & Sigar::IFF_BROADCAST) != 0
    bcast = "  Bcast:" + ifconfig.broadcast
  else
    bcast = ""
  end

  puts "\t" + "inet addr:" + ifconfig.address +
    ptp + bcast + " Mask:" + ifconfig.netmask

  if ifconfig.prefix6_length != 0
    puts "\t" + "inet6 addr: " + ifconfig.address6 + "/" +
      ifconfig.prefix6_length.to_s + " Scope:" + ifconfig.scope6.to_s
  end

  puts "\t" +
    Sigar.net_interface_flags_to_s(flags) +
    " MTU:" + ifconfig.mtu.to_s +
    " Metric:" + ifconfig.metric.to_s

  if (!ifname.include?(":"))
    ifstat = sigar.net_interface_stat(ifname)
    puts "\t" +
        "RX packets:" + ifstat.rx_packets.to_s +
        " errors:" + ifstat.rx_errors.to_s +
        " dropped:" + ifstat.rx_dropped.to_s +
        " overruns:" + ifstat.rx_overruns.to_s +
        " frame:" + ifstat.rx_frame.to_s

    puts "\t" +
        "TX packets:" + ifstat.tx_packets.to_s +
        " errors:" + ifstat.tx_errors.to_s +
        " dropped:" + ifstat.tx_dropped.to_s +
        " overruns:" + ifstat.tx_overruns.to_s +
        " carrier:" + ifstat.tx_carrier.to_s

    puts "\t" + "collisions:" + ifstat.tx_collisions.to_s

    rx_bytes = ifstat.rx_bytes
    tx_bytes = ifstat.tx_bytes

    print "\t" +
      "RX bytes:" + rx_bytes.to_s +
      " (" + Sigar.format_size(rx_bytes) + ")" +
      "  " +
      "TX bytes:" + tx_bytes.to_s +
      " (" + Sigar.format_size(tx_bytes) + ")" + "\n";
  end
end