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git://projects.qi-hardware.com/openwrt-xburst.git
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afc4535cfc
Calculate complements by using awk's xor() function with a mask of 0xffffffff instead of relying on the compl() function which appears to produce broken results on certain 64bit architectures. git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34875 3c298f89-4303-0410-b956-a3cf2f4a3e73
68 lines
1.4 KiB
Bash
Executable File
68 lines
1.4 KiB
Bash
Executable File
#!/bin/sh
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awk -f - $* <<EOF
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function bitcount(c) {
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c=and(rshift(c, 1),0x55555555)+and(c,0x55555555)
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c=and(rshift(c, 2),0x33333333)+and(c,0x33333333)
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c=and(rshift(c, 4),0x0f0f0f0f)+and(c,0x0f0f0f0f)
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c=and(rshift(c, 8),0x00ff00ff)+and(c,0x00ff00ff)
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c=and(rshift(c,16),0x0000ffff)+and(c,0x0000ffff)
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return c
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}
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function ip2int(ip) {
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for (ret=0,n=split(ip,a,"\."),x=1;x<=n;x++) ret=or(lshift(ret,8),a[x])
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return ret
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}
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function int2ip(ip,ret,x) {
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ret=and(ip,255)
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ip=rshift(ip,8)
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for(;x<3;ret=and(ip,255)"."ret,ip=rshift(ip,8),x++);
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return ret
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}
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function compl32(v) {
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ret=xor(v, 0xffffffff)
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return ret
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}
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BEGIN {
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slpos=index(ARGV[1],"/")
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if (slpos == 0) {
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ipaddr=ip2int(ARGV[1])
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netmask=ip2int(ARGV[2])
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} else {
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ipaddr=ip2int(substr(ARGV[1],0,slpos-1))
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netmask=compl32(2**(32-int(substr(ARGV[1],slpos+1)))-1)
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ARGV[4]=ARGV[3]
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ARGV[3]=ARGV[2]
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}
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network=and(ipaddr,netmask)
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broadcast=or(network,compl32(netmask))
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start=or(network,and(ip2int(ARGV[3]),compl32(netmask)))
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limit=network+1
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if (start<limit) start=limit
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end=start+ARGV[4]
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limit=or(network,compl32(netmask))-1
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if (end>limit) end=limit
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print "IP="int2ip(ipaddr)
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print "NETMASK="int2ip(netmask)
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print "BROADCAST="int2ip(broadcast)
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print "NETWORK="int2ip(network)
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print "PREFIX="32-bitcount(compl32(netmask))
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# range calculations:
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# ipcalc <ip> <netmask> <start> <num>
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if (ARGC > 3) {
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print "START="int2ip(start)
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print "END="int2ip(end)
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}
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}
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EOF
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