#!/usr/bin/env ruby

# Copyright (c) 2006 Konstantin Saurbier 
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote products
#    derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.


if(!ARGV[0])
        puts "Usage:"
        puts "    #{$0} zone-file"
        exit
end


## Initialize variables
# Open file, given as first argument
file = ARGV[0]

# output buffers found ips
output = Hash.new()


# Read and process every line of the zone-file
f = File.new(file, "r")
f.each_line do |line|

        # Ignore comments
        if(line =~ /^\w/)

                # Find lines with IP addresses
                if(line =~ /\d+\.\d+\.\d+\.\d+/)

                        # Add IP to Hash or increment value 
                        if(output.has_key?($&))
                                output[$&] += 1
                        else
                                output[$&] = 1
                        end
                end
        end
end
f.close

# Process output buffer, print all elements with value
# > 1 (IP appears more than once in zone).
output.each do |key, num|
        if(num > 1)
                puts key+": "+num.to_s
        end
end

#EOF