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Routines for dealing with nmap-style IPv4 address ranges.
The nmap range specification represents between 1 and 4 contiguous IP address
blocks depending on the range specified.
Each octets can be represented with hyphenated range sets according to the
following rules:
1. * C{'x-y'} - the hyphenated octet (represents values x through y)
2. x must be less than or equal to y
3. x and y must be values between 0 through 255
Example nmap ranges ::
'192.0.2.1' # one IP address
'192.0.2.0-31' # one block with 32 IP addresses.
'192.0.2-3.1-254' # two blocks with 254 IP addresses.
'0-255.0-255.0-255.0-255' # the whole IPv4 address space
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@param iprange: an nmap-style IP address range.
@return: C{True} if IP range is valid, C{False} otherwise.
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The nmap security tool supports a custom type of IPv4 range using multiple
hyphenated octets. This generator provides iterators yielding IP addresses
according to this rule set.
@param iprange: an nmap-style IP address range.
@return: an iterator producing IPAddress objects for each IP in the range.
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