[SOLVED] (bash) check if IP in subnet range file

Issue

I've a list of subnet range in a file:

2.32.0.0-2.47.255.255-255.240.0.0
2.112.0.0-2.119.255.255-255.248.0.0
2.156.0.0-2.159.255.255-255.252.0.0
2.192.0.0-2.199.255.255-255.248.0.0
...

(The file format is: {startip}-{endip}-{netmask})

I need check if an IP is included in one of the subnet in the file.

Solution

Try this:

BEGIN {
    FS="."
    ex = "false"
    split(address, ip, ".")
}
{
    split($0, range, "[-.]")
    for (i=1; i<5; i++) {
        if (ip[i] < range[i] || ip[i] > range[i+4])
            break;
        else if ((ip[i] > range[i] && ip[i] < range[i+4]) || i == 4)
            ex = "true"
    }
}
END {
    print ex
}

Invoke this awk script (checkIP.awk) like this:

$ awk -v address="2.156.0.5" -f checkIP.awk /path/to/ip/ranges/file
true
$ awk -v address="0.0.0.0" -f checkIP.awk /path/to/ip/ranges/file
false

Answered By - ShellFish

Answer Checked By - Clifford M. (WPSolving Volunteer)