[Bro-Dev] [JIRA] (BIT-1298) IP_Hdr pointer do not propagate from udp to child analyzers via DeliverPacket method causing a segfault
Eric Asselin (JIRA)
jira at bro-tracker.atlassian.net
Tue Dec 9 13:57:00 PST 2014
[ https://bro-tracker.atlassian.net/browse/BIT-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=19203#comment-19203 ]
Eric Asselin commented on BIT-1298:
-----------------------------------
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*, 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* 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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