[Windows] IgnoreCIDR test failure

[staticlibs]

There is an intermittent test failure, that happens in about 1 in 10 test runs and can be reproduced only on Windows:

======================================================================
FAIL: test_1_5 (test_34ignorecidr.ignorecidr)
TEST 1.5: Verify IgnoreCIDR x.x.x.x./32 is converted to IgnoreIP
----------------------------------------------------------------------
Traceback (most recent call last):
  File "D:\a\naxsi\naxsi\unit-tests\python\test_34ignorecidr.py", line 196, in test_1_5
    self.assertEqual(ec, 200)
AssertionError: 412 != 200

----------------------------------------------------------------------

It may or may not be related to a real Windows-specific problem in IP conversion area, I intend to investigate it.

[wargio]

i had a partial idea to rewrite naxsi and make it more like a library with proper unit tests and resolve these sort of issues. Are you sure that the IP is correct? are you parsing the forwarded headers correctly from the test?

[staticlibs]

Yes, a separate library possibly will make it easier to write unit tests.

I've reproduced the issue on Windows and submitted the patch in #48. Just a couple of related questions:

1. strlen is used to determine the length of X-Forwarded-For header value: here, and here. Should it just use value.len instead? It also formats (for logging) value.data with %s, should it be value and %V instead?

2. Should I add something like (not sure about the appropriate naxsi_error_fatal usage):

   if (!ip.data) {
   naxsi_error_fatal(ctx, r, "failed alloc");
   return;
   }

[wargio]

yes this check should be done. if it happens we should throw a 500