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https://bro-tracker.atlassian.net/browse/BIT-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=19203#comment-19203
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Eric Asselin edited comment on BIT-1298 at 12/9/14 4:06 PM:
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I'm writing a protocol analyzer that use UDP as transport layer, so my analyzer
extend "Analyzer" class. In the DeliverPacket method of my analyzer, I need to
access the IP address and UDP port. When I try to retrieve the IP address from
the "IP_Hdr* ip", it trigger a segmentation fault due to an invalid pointer.
Then I use NTP analyzer, due to its use of UDP and its simplicity, to test the
retrieval of an IP address from the "IP_Hdr* ip" in DeliverPacket method but I
have the same result. Be sure to parse NTP traffic to trigger the analyzer.
was (Author: easselin):
I'm writing a protocol analyzer that use UDP as transport layer, so my analyzer
extend "Analyzer" class. In the DeliverPacket method of my analyzer, I need to
access the IP address and UDP port. When I try to retrieve the IP address from
the "IP_Hdr* ip", it trigger a segmentation fault due to an invalid pointer.
Then I use NTP analyzer, due to its use of UDP and its simplicity, to test the
retrieval of an IP address from the "IP_Hdr* ip" in DeliverPacket method but I
have the same result.
> IP_Hdr pointer do not propagate from udp to child analyzers via DeliverPacket
> method causing a segfault
> -------------------------------------------------------------------------------------------------------
>
> Key: BIT-1298
> URL: https://bro-tracker.atlassian.net/browse/BIT-1298
> Project: Bro Issue Tracker
> Issue Type: Problem
> Components: Bro
> Affects Versions: 2.3
> Environment: Debian
> Reporter: Eric Asselin
> Priority: High
> Labels: analyzer
> Attachments: core.zip
>
>
> From a child analyzer like NTP, the IP_Hdr pointer in the DeliverPacket
> method is empty and unusable causing a segmentation fault as soon as you try
> to access it.
> To recreate the bug, just add an "assert(ip)" inside the DeliverPacket method
> of a UDP child analyzer and the execution will fail (instead of the
> segmentation fault).
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