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#!/usr/bin/perl
#
# Convert Cisco routing table listing to list of prefixes
#
$loc = ($ARGV[0] eq "-l"); # Print only local prefixes
while (<STDIN>) {
($loc ? /^[OR]\s/ : /^B\s/) || next;
/^[ORB]( E[12])?\s+(\d+\.\d+\.\d+\.\d+)(\s|\/\d+\s)/ || die "Cannot parse $_";
$net = $2;
$len = $3;
if ($len =~ /^\s*$/) {
# Magic rule :)
$len = ($net =~ /\.0$/) ? 24 : 32;
}
$len =~ s/^\///;
$net =~ /(\d+)\.(\d+)\.(\d+)\.(\d+)/;
printf "%02x%02x%02x%02x/%d\n", $1, $2, $3, $4, $len;
}
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