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Raise warnings when for DNS events that are not raised due to dns_skip_all_addl

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By default, dns_skip_all_addl is set to false. This causes several
events to not be raised. This change emits warnings when a user defines
event handlers for events that will not be raised.

Furthermore, it adds notes about this behavior to the documentation. We
also introduce a new BIF, `is_event_handled`, which checks if an event
is handled.

Fixes GH-4061
This commit is contained in:
Johanna Amann 2025-01-07 17:46:27 +00:00
parent 87d9ecb743
commit 9f72353a41
7 changed files with 106 additions and 3 deletions
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6
testing/btest/Baseline/scripts.base.protocols.dns.event-handler-warning/.stderr Normal file
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### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
warning in <...>/check-event-handlers.zeek, line 15: Used event 'dns_EDNS_tcp_keepalive' will not be raised because 'dns_skip_all_addl' is true
warning in <...>/check-event-handlers.zeek, line 15: Used event 'dns_EDNS_cookie' will not be raised because 'dns_skip_all_addl' is true
warning in <...>/check-event-handlers.zeek, line 15: Used event 'dns_EDNS_ecs' will not be raised because 'dns_skip_all_addl' is true
warning in <...>/check-event-handlers.zeek, line 15: Used event 'dns_EDNS_addl' will not be raised because 'dns_skip_all_addl' is true
warning in <...>/check-event-handlers.zeek, line 18: Used event 'dns_TKEY' will not contain any data in 'ans' because 'dns_skip_all_addl' is true