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authorJo-Philipp Wich <jow@openwrt.org>2012-12-23 22:18:43 +0000
committerJo-Philipp Wich <jow@openwrt.org>2012-12-23 22:18:43 +0000
commitab6e2e69287c606f4459c558becc26cea1cabbfc (patch)
tree9a6f99d4fda4722668656eedc70d1d576d484b28 /package/base-files/files
parent2c05915b2406c3f5a0acca92789cd307edfcd145 (diff)
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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. SVN-Revision: 34875
Diffstat (limited to 'package/base-files/files')
-rwxr-xr-xpackage/base-files/files/bin/ipcalc.sh15
1 files changed, 10 insertions, 5 deletions
diff --git a/package/base-files/files/bin/ipcalc.sh b/package/base-files/files/bin/ipcalc.sh
index d6ef168706..7463d6bdda 100755
--- a/package/base-files/files/bin/ipcalc.sh
+++ b/package/base-files/files/bin/ipcalc.sh
@@ -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>