Convert ip ranges to CIDR netblock Post: 303027262

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Top Forums Shell Programming and Scripting Convert ip ranges to CIDR netblock Post 303027262 by azdps on Wednesday 12th of December 2018 03:16:50 PM

12-12-2018

Registered User

After reviewing the suggested post I've come up with the following code:

Code:

#!/bin/sh

# Library with various ip manipulation functions
# convert ip ranges to CIDR notation

function range2cidr(ipStart, ipEnd,  bits, mask, newip) {
    bits = 1
    mask = 1
    while (bits < 32) {
        newip = or(ipStart, mask)
        if ((newip>ipEnd) || ((lshift(rshift(ipStart,bits),bits)) != ipStart)) {
           bits--
           mask = rshift(mask,1)
           break
        }
        bits++
        mask = lshift(mask,1)+1
    }
    newip = or(ipStart, mask)
    bits = 32 - bits
    result = dec2ip(ipStart) "/" bits
    if (newip < ipEnd) result = range2cidr(newip + 1, ipEnd)
    return result
}

# convert dotted quads to long decimal ip
#	int ip2dec("192.168.0.15")
#
function ip2dec(ip,   slice) {
	split(ip, slice, ".")
	return (slice[1] * 2^24) + (slice[2] * 2^16) + (slice[3] * 2^8) + slice[4]
}

# convert decimal long ip to dotted quads
#	str dec2ip(1171259392)
#
function dec2ip(dec,    ip, quad) {
	for (i=3; i>=1; i--) {
		quad = 256^i
		ip = ip int(dec/quad) "."
		dec = dec%quad
	}
	return ip dec
}

function sanitize(ip) {
	split(ip, slice, ".")
	return slice[1]/1 "." slice[2]/1 "." slice[3]/1 "." slice[4]/1
}


BEGIN{
	FS=" , | - "
}

# sanitize ip's
{$1 = sanitize($1); $2 = sanitize($2)}

# range with a single IP
$1==$2 {printf "%s\n", $1}

# ranges with multiple IP's
$1!=$2{print range2cidr(ip2dec($1), ip2dec($2))}

# footer
END {print "COMMIT\n"}

The ip address ranges are correctly converted to CIDR and printed to the console. Instead of printing to the console how do I send the information to a file instead? I don't need anything printed to the console. Also I was interested in mawk since might be faster than gawk. mawk doesn't have the lshift rshift etc. Can someone make the code more portable so I can use try mawk.

Thank you

azdps

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LEARN ABOUT CENTOS

systemd.slice

SYSTEMD.SLICE(5)						   systemd.slice						  SYSTEMD.SLICE(5)

NAME

       systemd.slice - Slice unit configuration

SYNOPSIS

       slice.slice

DESCRIPTION

       A unit configuration file whose name ends in ".slice" encodes information about a slice which is a concept for hierarchially managing
       resources of a group of processes. This management is performed by creating a node in the Linux Control Group (cgroup) tree. Units that
       manage processes (primarilly scope and service units) may be assigned to a specific slice. For each slice, certain resource limits may the
       be set that apply to all processes of all units contained in that slice. Slices are organized hierarchially in a tree. The name of the
       slice encodes the location in the tree. The name consists of a dash-separated series of names, which describes the path to the slice from
       the root slice. The root slice is named, -.slice. Example: foo-bar.slice is a slice that is located within foo.slice, which in turn is
       located in the root slice -.slice.

       By default, service and scope units are placed in system.slice, virtual machines and containers registered with systemd-machined(1) are
       found in machine.slice, and user sessions handled by systemd-logind(1) in user.slice. See systemd.special(5) for more information.

       See systemd.unit(5) for the common options of all unit configuration files. The common configuration items are configured in the generic
       [Unit] and [Install] sections. The slice specific configuration options are configured in the [Slice] section. Currently, only generic
       resource control settings as described in systemd.resource-control(7) are allowed.

       Unless DefaultDependencies=false is used, slice units will implicitly have dependencies of type Conflicts= and Before= on shutdown.target.
       These ensure that slice units are removed prior to system shutdown. Only slice units involved with early boot or late system shutdown
       should disable this option.

SEE ALSO

       systemd(1), systemd.unit(5), systemd.resource-control(5), systemd.service(5), systemd.scope(5), systemd.special(7), systemd.directives(7)

systemd 208															  SYSTEMD.SLICE(5)