Snort mailing list archives
Re: unified2 extra data - howto
From: Pablo Cantos Polaino <pcantos () redborder org>
Date: Thu, 26 Mar 2015 09:07:28 +0100
Hi Michal, I'm working on including some extra data fields related to files captured by Snort. For that, I'm using the new and experimental File preprocessor and modifying some pieces of code. Until now, I managed to include in snort.log.<timestamp> files the extra data which I was interested on. I hope I could share it shortly. I would recommend you to put the following line: p->xtradata_mask |= BIT(config->xtra_funkcion_id); instead of: _dpd.streamAPI->set_extra_data(p->stream_session, p,
config->xtra_funkcion_id);
If this doesn't work, could you use gdb to be sure the CallBackFunctionUnified2 function is been called? Best Regards, Pablo Cantos redborder.org / pcantos () redborder org 2015-03-25 23:35 GMT+01:00 Michal Keníž <michalkeniz () gmail com>:
Hello, I am currently developing a snort dynamic preprocessor. I would like* to log some additional data to the unified2-extra field *as described here http://manual.snort.org/node44.html#SECTION00637000000000000000 . I couldn't find any howtos or documentation about this topic, so I tried to figure it out by inspecting the smtp preprocessor which uses the extra data field (as can be seen here https://www.snort.org/faq/readme-unified2 ). I thought it should be enough if i use the following code: - Init function ~ *static void Init(struct _SnortConfig *sc, char *args){* *//basic init stufff ~ config and registering* *config->xtra_funkcion_id = _dpd.streamAPI->reg_xtra_data_cb(CallBackFunctionUnified2);* *}* - CallBackfunction ~ *int CallBackFunctionUnified2(void *data, uint8_t **buf, uint32_t *len, uint32_t *type)*{ *_dpd.logMsg("Npcusum: JUST TRYING IF THIS FUNCTION IS CALLED WHILE TRAFFIC PROCESSING \n");* * return 0;* } - Packet processing ~ *static void ProcessPacket(void *pkt, void *context)* *// not important stuff.* * if ((p->tcp_header->flags & TCPHEADER_FIN) == TCPHEADER_FIN) { // just packets with FIN flag* * config->userdata.fin_count = config->userdata.fin_count + 1;* * _dpd.logMsg("Npcusum: JUST TRYING TO LOG SOMETHING :\n"); * * _dpd.streamAPI->set_extra_data(p->stream_session, p, config->xtra_funkcion_id);* * }* *// not important stuff.* But this doesn't work, no log message is displayed (so the function is not called at all). Would it be possible to give me some info/guidlines about using the unified2 extra data field in a new dynamic preprocessor - a basic example (maybe an extension of the snort example preprocessor?), or just a list of requirements I do have to fullfill for it to work. Thank you for your time, best regards Michal -- Carpe Diem ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Snort-devel mailing list Snort-devel () lists sourceforge net https://lists.sourceforge.net/lists/listinfo/snort-devel Archive: http://sourceforge.net/mailarchive/forum.php?forum_name=snort-devel Please visit http://blog.snort.org for the latest news about Snort!
------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/
_______________________________________________ Snort-devel mailing list Snort-devel () lists sourceforge net https://lists.sourceforge.net/lists/listinfo/snort-devel Archive: http://sourceforge.net/mailarchive/forum.php?forum_name=snort-devel Please visit http://blog.snort.org for the latest news about Snort!
Current thread:
- unified2 extra data - howto Michal Keníž (Mar 25)
- Re: unified2 extra data - howto Pablo Cantos Polaino (Mar 26)