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Fix: 7a3aa41a
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The check for grease was too broad and filtered some valid values.
In particular, the value 257 was skipped because it matched the previous check.
This has been discovered while parsing tests/pcap/443-firefox.pcap
expected ja3:
771,4865-4867-4866-49195-49199-52393-52392-49196-49200-49162-49161-49171-49172-51-57-47-53-10,0-23-65281-10-11-35-16-5-51-43-13-45-28-21,29-23-24-25-256-257,0
previously generated ja3:
771,4865-4867-4866-49195-49199-52393-52392-49196-49200-49162-49161-49171-49172-51-57-47-53-10,0-23-65281-10-11-35-16-5-51-43-13-45-28-21,29-23-24-25-256,0
Signed-off-by: Patrick Havelange <patrick.havelange_ext@softathome.com>
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As a general rule, the higher the confidence value, the higher the
"reliability/precision" of the classification.
In other words, this new field provides an hint about "how" the flow
classification has been obtained.
For example, the application may want to ignore classification "by-port"
(they are not real DPI classifications, after all) or give a second
glance at flows classified via LRU caches (because of false positives).
Setting only one value for the confidence field is a bit tricky: more
work is probably needed in the next future to tweak/fix/improve the logic.
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The goal is to have a (roughly) idea about how many packets nDPI needs
to properly classify a flow.
Log this information (and guessed flows number too) during unit tests,
to keep track of improvements/regressions across commits.
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- invalid DNS traffic (probably carrying exfiltrated data)
- TLS traffic with no SNI extension
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Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
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