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https://bro-tracker.atlassian.net/browse/BIT-844?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jon Siwek updated BIT-844:
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Fix Version/s: 2.4
> UDP payload signature patterns don't match packet-wise
> ------------------------------------------------------
>
> Key: BIT-844
> URL: https://bro-tracker.atlassian.net/browse/BIT-844
> Project: Bro Issue Tracker
> Issue Type: Problem
> Components: Bro
> Affects Versions: git/master
> Reporter: Jon Siwek
> Assignee: Jon Siwek
> Priority: Low
> Fix For: 2.4
>
>
> The docs say:
> {noformat}
> Regular expressions are implicitly anchored, i.e., they work as if prefixed
> with the ^ operator. For reassembled TCP connections, they are anchored at
> the first byte of the payload stream. For all other connections, they are
> anchored at the first payload byte of each packet. To match at arbitrary
> positions, you can prefix the regular expression with .*, as done in the
> examples above.
> {noformat}
> But for a UDP connection made up of 2 packets with payloads "XXXX'" and then
> "YYYY", I still need the ".*" prefix to match on the 2nd:
> {noformat}
> signature yyyy {
> ip-proto = udp
> payload /.*YYYY/
> event "Found YYYY"
> }
> {noformat}
> Changing the pattern to {{/YYYY/}} or {{/^YYYY/}} results in no match (but
> does match if I flip order of packets).
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