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/usr/bin/aggregate-ios is in aggregate 1.6-7.

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#!/usr/bin/perl
#
# $Id: aggregate-ios,v 1.6 2001/03/27 22:32:08 shields Exp $
# 
# Copyright (c) 2000-2001 by Metromedia Fiber Network Services, Inc.
# 
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
# 
# THE SOFTWARE IS PROVIDED "AS IS" AND METROMEDIA FIBER NETWORK SERVICES,
# INC. ("MFN") DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
# INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
# EVENT SHALL MFN BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
# CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
# USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
# OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.
# 
#   Metromedia Fiber Network
#   360 Hamilton Avenue
#   White Plains, NY 10601
# 
#   http://www.mmfn.com/
#
# aggregate-ios:
#
#   Receive some prefix lists in ios syntax on stdin, feed
#   them through aggregate(1), then return the results in
#   ios syntax on stdout.  Also encodes some filtering policy.
#
# michael.shields@mmfn.com
# based on an sh/awk script by jabley@mfnx.net

use IPC::Open2;
use strict;

my %lists = ();

while (<STDIN>) {
    if (/^ip prefix-list (\S+) permit (.*)/
	|| /^ip prefix-list (\S+) seq \d+ permit (.*)/) {
	$lists{$1} .= "$2\n";
    }
}

foreach my $list (sort keys %lists) {
    next unless length $lists{$list};
    open2(\*RH, \*WH, 'aggregate', '-m32', '-o32')
	or die "couldn't open pipe to aggregate: $!\n";
    print WH $lists{$list};
    close WH  or die "couldn't close write pipe to aggregate: $!\n";
    while (<RH>) {
	chop;
	(my $x, my $length) = split m,/,;
	print "ip prefix-list $list permit $_";
	print " le 24" if $length < 24;
	print "\n";
    }
    close RH  or die "couldn't close read pipe to aggregate: $!\n";
}