package/base-files/default/bin/ipcalc

   1 #!/bin/sh
   2 # Copyright (C) 2006 OpenWrt.org
   3
   4 awk -f /usr/lib/common.awk -f - $* <<EOF
   5 BEGIN {
   6         ipaddr=ip2int(ARGV[1])
   7         netmask=ip2int(ARGV[2])
   8         network=and(ipaddr,netmask)
   9         broadcast=or(network,compl(netmask))
  10
  11         start=or(network,and(ip2int(ARGV[3]),compl(netmask)))
  12         limit=network+1
  13         if (start<limit) start=limit
  14
  15         end=start+ARGV[4]
  16         limit=or(network,compl(netmask))-1
  17         if (end>limit) end=limit
  18
  19         print "IP="int2ip(ipaddr)
  20         print "NETMASK="int2ip(netmask)
  21         print "BROADCAST="int2ip(broadcast)
  22         print "NETWORK="int2ip(network)
  23         print "PREFIX="32-bitcount(compl(netmask))
  24
  25         # range calculations:
  26         # ipcalc <ip> <netmask> <start> <num>
  27
  28         if (ARGC > 3) {
  29                 print "START="int2ip(start)
  30                 print "END="int2ip(end)
  31         }
  32 }
  33 EOF