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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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 unit. A slice unit is a concept for hierarchically
       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 (primarily scope and service units) may be assigned to a specific slice. For each slice, certain resource limits may
       be set that apply to all processes of all units contained in that slice. Slices are organized hierarchically 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.

       Note that slice units cannot be templated, nor is possible to add multiple names to a slice unit by creating additional symlinks to its
       unit file.

       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(5) are allowed.

       See the New Control Group Interfaces[1] for an introduction on how to make use of slice units from programs.

IMPLICIT DEPENDENCIES

       The following dependencies are implicitly added:

       o   Slice units automatically gain dependencies of type After= and Requires= on their immediate parent slice unit.

DEFAULT DEPENDENCIES

       The following dependencies are added unless DefaultDependencies=no is set:

       o   Slice units will automatically 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 late system shutdown should disable DefaultDependencies= option.

SEE ALSO

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

NOTES

	1. New Control Group Interfaces
	   https://www.freedesktop.org/wiki/Software/systemd/ControlGroupInterface/

systemd 237															  SYSTEMD.SLICE(5)