I was going through the basic architecture
of wireshark and i came to know that capture module deals with libpcap
api's and pas sinformation to core module. this core module will than pass
it to epan where actually, if i am not wrong, the tree will be constructed
from the buffer it gets.
I was browsing the code of capture
file, in capture_loop.c file I got the following line of code
inpkts = pcap_dispatch(ld->pcap_h, 1, ld->packet_cb,
(u_char *)ld);
if (inpkts < 0) {
ld->pcap_err
= TRUE;
ld->go = FALSE;
/* error or pcap_breakloop() - stop capturing */
}
where ld->packet_cb will be the
handler called to process the packet. I serched the code but i did not
find where and which function's address is assigned to this function pointer.
At this point also I am supposing that data will be processed. Can you
plz put some more light on it and let me know the path to construct a protocol
tree from the buffer which is processed. If I am not wrong the tree used
for protocol will be a a generic tree and not specific kinda trees like
binary tree and all.
Plz clarify it a bit, as I am in urgent
need of browsing and understanding the code.
I appreciate your help in advance.
Guy Harris <guy@xxxxxxxxxxxx>
Sent by: wireshark-dev-bounces@xxxxxxxxxxxxx
06/03/2008 01:33 PM
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Subject
| Re: [Wireshark-dev] regarding packet
capture |
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Amit Paliwal wrote:
> Thanx for the suggestion, I went through the directory which provides
> very very minimal information its like hardly 20 lines written there
> that does not suffice for my query.
>
> kindly suggest some more ways to get that understanding.
See
http://www.cacetech.com/SHARKFEST.08/D02_Combs_Intro%20to%20Writing%20Wireshark%20Packet%20Dissectors.ppt
and some of the other presentations at
http://www.cacetech.com/SHARKFEST.08/
such as Ulf Lampings and mine.
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