296 lines
6.5 KiB
Ruby
296 lines
6.5 KiB
Ruby
require 'rex/socket'
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module Rex
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module Socket
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###
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#
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# This class provides an interface to enumerating an IP range
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#
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# This class uses start,stop pairs to represent ranges of addresses. This
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# is very efficient for large numbers of consecutive addresses, and not
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# show-stoppingly inefficient when storing a bunch of non-consecutive
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# addresses, which should be a somewhat unusual case.
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#
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###
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class RangeWalker
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#
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# Initializes a walker instance using the supplied range
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#
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def initialize(parseme)
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if parseme.is_a? RangeWalker
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@ranges = parseme.ranges.dup
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else
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@ranges = parse(parseme)
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end
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reset
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end
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def self.parse(parseme)
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self.new.parse(parseme)
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end
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def parse(parseme)
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return nil if not parseme
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ranges = []
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parseme.split(' ').each { |arg|
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if arg.include?("/")
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# Then it's CIDR notation and needs special case
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if arg =~ /[,-]/
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# Improper CIDR notation (can't mix with 1,3 or 1-3 style IP ranges)
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return false
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end
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expanded = expand_cidr(arg)
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if expanded
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ranges += expanded
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else
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return false
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end
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elsif arg.include?(":")
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# Then it's IPv6
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# Can't really do much with IPv6 right now, just return it and
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# hope for the best
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addr = Rex::Socket.addr_atoi(arg)
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ranges.push [addr, addr, true]
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elsif arg =~ /[^-0-9,.*]/
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# Then it's a domain name and we should send it on to addr_atoi
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# unmolested to force a DNS lookup.
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addr = Rex::Socket.addr_atoi(arg)
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ranges.push [addr, addr]
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else
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expanded = expand_nmap(arg)
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if expanded
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ranges += expanded
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else
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return false
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end
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end
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}
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return ranges
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end
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#
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# Resets the subnet walker back to its original state.
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#
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def reset
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return false if not valid?
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@curr_range = 0
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@curr_addr = @ranges[0][0]
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@length = 0
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@ranges.each { |r| @length += r[1] - r[0] + 1 }
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end
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#
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# Returns the next IP address.
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#
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def next_ip
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return false if not valid?
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if (@curr_addr > @ranges[@curr_range][1])
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if (@curr_range >= @ranges.length - 1)
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return nil
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end
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@curr_range += 1
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@curr_addr = @ranges[@curr_range][0]
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end
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addr = Rex::Socket.addr_itoa(@curr_addr, @ranges[@curr_range][2])
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@curr_addr += 1
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return addr
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end
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def valid?
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(@ranges and not @ranges.empty?)
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end
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#
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# Returns true if the argument is an ip address that falls within any of
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# the stored ranges.
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#
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def include?(addr)
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return false if not @ranges
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if (addr.is_a? String)
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addr = Rex::Socket.addr_atoi(addr)
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end
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@ranges.map { |r|
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if r.start <= addr and addr <= r.stop
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return true
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end
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}
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return false
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end
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#
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# Calls the given block with each address
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#
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def each(&block)
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while (ip = next_ip)
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block.call(ip)
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end
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end
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#
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# Returns an array with one element, a Range defined by the given CIDR
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# block.
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#
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def expand_cidr(arg)
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start,stop = Rex::Socket.cidr_crack(arg)
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if !start or !stop
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return false
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end
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range = Range.new
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range.start = Rex::Socket.addr_atoi(start)
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range.stop = Rex::Socket.addr_atoi(stop)
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range.ipv6 = (arg.include?(":"))
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return [range]
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end
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#
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# Expands an nmap-style host range x.x.x.x where x can be simply "*" which
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# means 0-255 or any combination and repitition of:
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# i,n
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# n-m
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# i,n-m
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# n-m,i
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# ensuring that n is never greater than m.
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#
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# non-unique elements will be removed
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# e.g.:
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# 10.1.1.1-3,2-2,2 => ["10.1.1.1", "10.1.1.2", "10.1.1.3"]
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# 10.1.1.1-3,7 => ["10.1.1.1", "10.1.1.2", "10.1.1.3", "10.1.1.7"]
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#
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# Returns an array of Ranges
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#
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def expand_nmap(arg)
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# Can't really do anything with IPv6
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return false if arg.include?(":")
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# nmap calls these errors, but it's hard to catch them with our
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# splitting below, so short-cut them here
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return false if arg.include?(",-") or arg.include?("-,")
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bytes = []
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sections = arg.split('.')
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if sections.length != 4
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# Too many or not enough dots
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return false
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end
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sections.each { |section|
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if section.empty?
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# pretty sure this is an unintentional artifact of the C
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# functions that turn strings into ints, but it sort of makes
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# sense, so why not
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# "10...1" => "10.0.0.1"
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section = "0"
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end
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if section == "*"
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# I think this ought to be 1-254, but this is how nmap does it.
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section = "0-255"
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elsif section.include?("*")
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return false
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end
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# Break down the sections into ranges like so
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# "1-3,5-7" => ["1-3", "5-7"]
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ranges = section.split(',', -1)
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sets = []
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ranges.each { |r|
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bounds = []
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if r.include?('-')
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# Then it's an actual range, break it down into start,stop
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# pairs:
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# "1-3" => [ 1, 3 ]
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# if the lower bound is empty, start at 0
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# if the upper bound is empty, stop at 255
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#
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bounds = r.split('-', -1)
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return false if (bounds.length > 2)
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bounds[0] = 0 if bounds[0].nil? or bounds[0].empty?
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bounds[1] = 255 if bounds[1].nil? or bounds[1].empty?
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bounds.map!{|b| b.to_i}
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return false if bounds[0] > bounds[1]
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else
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# Then it's a single value
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bounds[0] = r.to_i
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end
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return false if bounds[0] > 255 or (bounds[1] and bounds[1] > 255)
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return false if bounds[1] and bounds[0] > bounds[1]
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if bounds[1]
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bounds[0].upto(bounds[1]) do |i|
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sets.push(i)
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end
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elsif bounds[0]
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sets.push(bounds[0])
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end
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}
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bytes.push(sets.sort.uniq)
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}
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#
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# Combinitorically squish all of the quads together into a big list of
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# ip addresses, stored as ints
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#
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# e.g.:
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# [[1],[1],[1,2],[1,2]]
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# =>
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# [atoi("1.1.1.1"),atoi("1.1.1.2"),atoi("1.1.2.1"),atoi("1.1.2.2")]
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addrs = []
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for a in bytes[0]
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for b in bytes[1]
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for c in bytes[2]
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for d in bytes[3]
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ip = (a << 24) + (b << 16) + (c << 8) + d
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addrs.push ip
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end
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end
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end
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end
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addrs.sort!
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addrs.uniq!
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rng = Range.new
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rng.start = addrs[0]
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ranges = []
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1.upto(addrs.length - 1) do |idx|
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if addrs[idx - 1] + 1 == addrs[idx]
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# Then this address is contained in the current range
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next
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else
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# Then this address is the upper bound for the current range
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rng.stop = addrs[idx - 1]
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ranges.push(rng.dup)
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rng.start = addrs[idx]
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end
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end
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rng.stop = addrs[addrs.length - 1]
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ranges.push(rng.dup)
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return ranges
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end
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#
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# The total number of IPs within the range
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#
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attr_reader :ranges
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attr_reader :length
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# for backwards compatibility
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alias :num_ips :length
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end
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class Range < Array
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def start; self[0]; end
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def stop; self[1]; end
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def ipv6; self[2]; end
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def start=(val); self[0] = val; end
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def stop=(val); self[1] = val; end
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def ipv6=(val); self[2] = val; end
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end
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end
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end
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