package/base-files/files/bin/ipcalc.sh

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