| 1 | #!/bin/sh |
| 2 | |
| 3 | awk -f - $* <<EOF |
| 4 | function bitcount(c) { |
| 5 | c=and(rshift(c, 1),0x55555555)+and(c,0x55555555) |
| 6 | c=and(rshift(c, 2),0x33333333)+and(c,0x33333333) |
| 7 | c=and(rshift(c, 4),0x0f0f0f0f)+and(c,0x0f0f0f0f) |
| 8 | c=and(rshift(c, 8),0x00ff00ff)+and(c,0x00ff00ff) |
| 9 | c=and(rshift(c,16),0x0000ffff)+and(c,0x0000ffff) |
| 10 | return c |
| 11 | } |
| 12 | |
| 13 | function ip2int(ip) { |
| 14 | for (ret=0,n=split(ip,a,"\."),x=1;x<=n;x++) ret=or(lshift(ret,8),a[x]) |
| 15 | return ret |
| 16 | } |
| 17 | |
| 18 | function int2ip(ip,ret,x) { |
| 19 | ret=and(ip,255) |
| 20 | ip=rshift(ip,8) |
| 21 | for(;x<3;ret=and(ip,255)"."ret,ip=rshift(ip,8),x++); |
| 22 | return ret |
| 23 | } |
| 24 | |
| 25 | BEGIN { |
| 26 | slpos=index(ARGV[1],"/") |
| 27 | if (slpos == 0) { |
| 28 | ipaddr=ip2int(ARGV[1]) |
| 29 | netmask=ip2int(ARGV[2]) |
| 30 | } else { |
| 31 | ipaddr=ip2int(substr(ARGV[1],0,slpos-1)) |
| 32 | netmask=compl(2**(32-int(substr(ARGV[1],slpos+1)))-1) |
| 33 | ARGV[4]=ARGV[3] |
| 34 | ARGV[3]=ARGV[2] |
| 35 | } |
| 36 | |
| 37 | network=and(ipaddr,netmask) |
| 38 | broadcast=or(network,compl(netmask)) |
| 39 | |
| 40 | start=or(network,and(ip2int(ARGV[3]),compl(netmask))) |
| 41 | limit=network+1 |
| 42 | if (start<limit) start=limit |
| 43 | |
| 44 | end=start+ARGV[4] |
| 45 | limit=or(network,compl(netmask))-1 |
| 46 | if (end>limit) end=limit |
| 47 | |
| 48 | print "IP="int2ip(ipaddr) |
| 49 | print "NETMASK="int2ip(netmask) |
| 50 | print "BROADCAST="int2ip(broadcast) |
| 51 | print "NETWORK="int2ip(network) |
| 52 | print "PREFIX="32-bitcount(compl(netmask)) |
| 53 | |
| 54 | # range calculations: |
| 55 | # ipcalc <ip> <netmask> <start> <num> |
| 56 | |
| 57 | if (ARGC > 3) { |
| 58 | print "START="int2ip(start) |
| 59 | print "END="int2ip(end) |
| 60 | } |
| 61 | } |
| 62 | EOF |
| 63 | |
