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We are currently looking to give interested third parties access to a stream of netflow data. In the interests of privacy for our users, we obviously wish to mask certain bits of information starting with the source/destination IP pairs.

Currently, the plan is to have the netflow data exported to a
flow-fanout process here, sanitised and then re-exported straight to the
researcher who has requested it.

Ideally, I would like to mask the addresses by the routing prefix. Using
flow-xlate that is pretty trivial
(ip-{destination,source}-address-to-network), but I cannot find a way to
effectively pipe the flow-fanout stream through flow-xlate before
re-exporting it. I am aware of the -m flag to flow-fanout, but I feel
using this will result in data that is too coarsely grained for some
applications.

Is there any way of doing something like flow-capture --stdout |
flow-xlate | flow-fanout --from-stdin 1/2/destination ?

If there isn't currently, what sort of effort would it take to implement
such functionality? Lastly, is there version control repository
somewhere I can sync against, so I can make sure any patches I make can
be contributed back to flow-tools?

Thanks in advance,
Ras

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