[Bro-Dev] #512: Make the mask_addr function return a subnet

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#512: Make the mask_addr function return a subnet
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 Reporter:  seth             |      Owner:
     Type:  Feature Request  |     Status:  new
 Priority:  Normal           |  Milestone:  Bro1.6
Component:  Bro              |    Version:
 Keywords:  preview          |
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 My email from the bro-dev list.

 {{{
 I think the existing mask_addr function may be named wrong.  Here's the
 current prototype:
         function mask_addr(a: addr, top_bits_to_keep: count): addr

 I want it to do this (and I think it makes more sense based on the name):
         function mask_addr(a: addr, top_bits_to_keep: count): subnet

 I'm not sure how the existing function was ever used, but it seems like it
 must have been a fairly limited use case.  Does that seem reasonable to
 change what that function does and steal the name?  I suppose the existing
 function could be renamed to something else if someone still knows of a
 use for it.

 In case it's not obvious from the prototypes above, what I'm aiming to do
 is take addresses and mask them off to subnets (I need it for aggregation
 with the metrics framework).
 For example...
 print mask_addr(1.2.3.4, 24)
         => 1.2.3.0/24
 }}}

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Ticket URL: <http://tracker.bro-ids.org/bro/ticket/512>
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