ipcalc.sh

ipcalc.sh

root@Anovo:~# 
root@Anovo:~# ipcalc.sh 192.168.0.1 24
IP=192.168.0.1
NETMASK=255.255.255.0
BROADCAST=192.168.0.255
NETWORK=192.168.0.0
PREFIX=24
root@Anovo:~# 
root@Anovo:~# ipcalc.sh 192.168.0.1 255.255.255.0 
IP=192.168.0.1
NETMASK=255.255.255.0
BROADCAST=192.168.0.255
NETWORK=192.168.0.0
PREFIX=24
root@Anovo:~# 
root@Anovo:~# ipcalc.sh 192.168.0.1 24 2 12
IP=192.168.0.1
NETMASK=255.255.255.0
BROADCAST=192.168.0.255
NETWORK=192.168.0.0
PREFIX=24
START=192.168.0.2
END=192.168.0.14
root@Anovo:~# 

#!/bin/sh

awk -f - $* <<EOF
function bitcount(c) {
    c=and(rshift(c, 1),0x55555555)+and(c,0x55555555)
    c=and(rshift(c, 2),0x33333333)+and(c,0x33333333)
    c=and(rshift(c, 4),0x0f0f0f0f)+and(c,0x0f0f0f0f)
    c=and(rshift(c, 8),0x00ff00ff)+and(c,0x00ff00ff)
    c=and(rshift(c,16),0x0000ffff)+and(c,0x0000ffff)
    return c
}

function ip2int(ip) {
    for (ret=0,n=split(ip,a,"\."),x=1;x<=n;x++) ret=or(lshift(ret,8),a[x])
    return ret
}

function int2ip(ip,ret,x) {
    ret=and(ip,255)
    ip=rshift(ip,8)
    for(;x<3;ret=and(ip,255)"."ret,ip=rshift(ip,8),x++);
    return ret
}

function compl32(v) {
    ret=xor(v, 0xffffffff)
    return ret
}

BEGIN {
    slpos=index(ARGV[1],"/")
    if (slpos == 0) {
        ipaddr=ip2int(ARGV[1])
        dotpos=index(ARGV[2],".")
        if (dotpos == 0)
            netmask=compl32(2**(32-int(ARGV[2]))-1)
        else
            netmask=ip2int(ARGV[2])
    } else {
        ipaddr=ip2int(substr(ARGV[1],0,slpos-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,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 "NETMASK="int2ip(netmask)
    print "BROADCAST="int2ip(broadcast)
    print "NETWORK="int2ip(network)
    print "PREFIX="32-bitcount(compl32(netmask))

    # range calculations:
    # ipcalc <ip> <netmask> <start> <num>

    if (ARGC > 3) {
        print "START="int2ip(start)
        print "END="int2ip(end)
    }
}
EOF

========= End