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base-files: ipcalc.sh: check for params before calculating start/end

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coolsnowwolf 2024-10-17 16:51:29 +08:00
parent 864e344469
commit 8527c75281
1 changed files with 34 additions and 17 deletions
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51
package/base-files/files/bin/ipcalc.sh
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@ -1,6 +1,5 @@
#!/bin/sh #!/usr/bin/awk -f
awk -f - $* <<EOF
function bitcount(c) { function bitcount(c) {
c=and(rshift(c, 1),0x55555555)+and(c,0x55555555) c=and(rshift(c, 1),0x55555555)+and(c,0x55555555)
c=and(rshift(c, 2),0x33333333)+and(c,0x33333333) c=and(rshift(c, 2),0x33333333)+and(c,0x33333333)
@ -11,14 +10,20 @@ function bitcount(c) {
} }
function ip2int(ip) { function ip2int(ip) {
for (ret=0,n=split(ip,a,"\."),x=1;x<=n;x++) ret=or(lshift(ret,8),a[x]) ret=0
n=split(ip,a,"\\.")
for (x=1;x<=n;x++)
ret=or(lshift(ret,8),a[x])
return ret return ret
} }
function int2ip(ip,ret,x) { function int2ip(ip,ret,x) {
ret=and(ip,255) ret=and(ip,255)
ip=rshift(ip,8) ip=rshift(ip,8)
for(;x<3;ret=and(ip,255)"."ret,ip=rshift(ip,8),x++); for(;x<3;x++) {
ret=and(ip,255)"."ret
ip=rshift(ip,8)
}
return ret return ret
} }
@ -44,28 +49,40 @@ BEGIN {
} }
network=and(ipaddr,netmask) network=and(ipaddr,netmask)
prefix=32-bitcount(compl32(netmask))
broadcast=or(network,compl32(netmask)) broadcast=or(network,compl32(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,compl32(netmask))-1
if (end>limit) end=limit
print "IP="int2ip(ipaddr) print "IP="int2ip(ipaddr)
print "NETMASK="int2ip(netmask) print "NETMASK="int2ip(netmask)
print "BROADCAST="int2ip(broadcast) print "BROADCAST="int2ip(broadcast)
print "NETWORK="int2ip(network) print "NETWORK="int2ip(network)
print "PREFIX="32-bitcount(compl32(netmask)) print "PREFIX="prefix
# range calculations: # range calculations:
# ipcalc <ip> <netmask> <start> <num> # ipcalc <ip> <netmask> <start> <num>
if (ARGC > 3) { if (ARGC <= 3)
print "START="int2ip(start) exit(0)
print "END="int2ip(end)
start=or(network,and(ip2int(ARGV[3]),compl32(netmask)))
limit=network+1
if (start<limit) start=limit
if (start==ipaddr) start=ipaddr+1
end=start+ARGV[4]
limit=or(network,compl32(netmask))-1
if (end>limit) end=limit
if (end==ipaddr) end=ipaddr-1
if (start>end) {
print "network ("int2ip(network)"/"prefix") too small" > "/dev/stderr"
exit(1)
} }
if (ipaddr > start && ipaddr < end) {
print "warning: ipaddr inside range - this might not be supported in future releases of Openwrt" > "/dev/stderr"
}
print "START="int2ip(start)
print "END="int2ip(end)
} }
EOF