Ignore:
Timestamp:
2011-05-18T11:50:06+02:00 (6 years ago)
Author:
jow
Message:

[PATCH] ipcalc.sh CIDR notation
Hi,

the attached patch makes ipcalc.sh accept IP/Netmask combinations in
CIDR notation. Before you could only do:

# sh ipcalc.sh 192.168.0.0 255.255.255.0 1 10
IP=192.168.0.0
NETMASK=255.255.255.0
BROADCAST=192.168.0.255
NETWORK=192.168.0.0
PREFIX=24
START=192.168.0.1
END=192.168.0.11

with this patch you can also execute it with:

sh ipcalc.sh 192.168.0.0/24 1 10
IP=192.168.0.0
NETMASK=255.255.255.0
BROADCAST=192.168.0.255
NETWORK=192.168.0.0
PREFIX=24
START=192.168.0.1
END=192.168.0.11

The patch is based on #1260 [1], i just changed one line to calculate
the START end END ips right. I wonder why that never got included. If
there is no reason not to do i would like to ask you to commit that
patch, because its a functionality i (and probably others) miss quite often.

Btw, i also fixed 4 useless tabs, that might look a bit strange in the
patch.

Regards, Manuel

File:
1 edited

Legend:

Unmodified
Added
Removed
  • trunk/package/base-files/files/bin/ipcalc.sh

    r25528 r26930  
    2424 
    2525BEGIN { 
    26         ipaddr=ip2int(ARGV[1]) 
    27         netmask=ip2int(ARGV[2]) 
     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 
    2837        network=and(ipaddr,netmask) 
    2938        broadcast=or(network,compl(netmask)) 
    30          
     39 
    3140        start=or(network,and(ip2int(ARGV[3]),compl(netmask))) 
    3241        limit=network+1 
    3342        if (start<limit) start=limit 
    34          
     43 
    3544        end=start+ARGV[4] 
    3645        limit=or(network,compl(netmask))-1 
     
    4251        print "NETWORK="int2ip(network) 
    4352        print "PREFIX="32-bitcount(compl(netmask)) 
    44          
     53 
    4554        # range calculations: 
    4655        # ipcalc <ip> <netmask> <start> <num> 
    47          
     56 
    4857        if (ARGC > 3) { 
    4958                print "START="int2ip(start) 
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