hak5
/
wifipineapple-openwrt
mirror of https://github.com/hak5/wifipineapple-openwrt.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

base-files: ipcalc.sh: fix broken calculations on 64bit systems 

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
master
Jo-Philipp Wich 2012-12-23 22:18:43 +00:00
parent f19b976355
commit a6a3bd8d57
1 changed files with 10 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
package/base-files/files/bin/ipcalc.sh
View File

@ -22,6 +22,11 @@ function int2ip(ip,ret,x) {
return ret
}
function compl32(v) {
ret=xor(v, 0xffffffff)
return ret
}
BEGIN {
slpos=index(ARGV[1],"/")
if (slpos == 0) {
@ -29,27 +34,27 @@ BEGIN {
netmask=ip2int(ARGV[2])
} else {
ipaddr=ip2int(substr(ARGV[1],0,slpos-1))
netmask=compl(2**(32-int(substr(ARGV[1],slpos+1)))-1)
netmask=compl32(2**(32-int(substr(ARGV[1],slpos+1)))-1)
ARGV[4]=ARGV[3]
ARGV[3]=ARGV[2]
}
network=and(ipaddr,netmask)
broadcast=or(network,compl(netmask))
broadcast=or(network,compl32(netmask))
start=or(network,and(ip2int(ARGV[3]),compl(netmask)))
start=or(network,and(ip2int(ARGV[3]),compl32(netmask)))
limit=network+1
if (start<limit) start=limit
end=start+ARGV[4]
limit=or(network,compl(netmask))-1
limit=or(network,compl32(netmask))-1
if (end>limit) end=limit
print "IP="int2ip(ipaddr)
print "NETMASK="int2ip(netmask)
print "BROADCAST="int2ip(broadcast)
print "NETWORK="int2ip(network)
print "PREFIX="32-bitcount(compl(netmask))
print "PREFIX="32-bitcount(compl32(netmask))
# range calculations:
# ipcalc <ip> <netmask> <start> <num>