Hi,
I'm trying to improve the time accuracy of ARRIVAL TIME which is the time
when a wireless frame is captured by Wireshark. In original Wireshark
program, the time resolution is micro-second, but I want to improve it to
nano-second for special applications.
As what I'm thinking, when a frame is captured by Wireshark through WinPcap,
the capture program of Wireshark calls a timer at the same time, and records
the value of the timer as the arrival time. So I want to use an Enhanced
Timer to instead of the normal timer to record the arrival time. Cause
Enhanced Timer can provide a constant, high accuracy time in nano-second, I
can improve the time accuracy of Arrival Time to nano-second.
So the key point is to find out which code sections are used to call the
timer to record the ARRIVAL TIME. I read the documents, especially
README.capture. But seems to me, it's very unclear about the process of the
wireless frame capture, it only gives a brief introduction. I have narrowed
the searching area to following files, but there are still thousands of
lines code need to be read. And things may be worse that what I'm thinking
is wrong, actually the code sections calling timer are in other files. If
anyone knows the positions of these specific code sections or has some
experience, I need your help.
Following is the suspected files:
capture-pcap-util-int.h
capture-pcap-util.h
capture-pcap-util.c
capture-wpcap.c
capture-wpcap.h
capture.c
capture.h
capture_info.c
capture_info.h
capture_opts.c
capture_opts.h
packet-ieee80211.c /*I'm going to use Wireshark to capture 802.11 wireless
network frames, */
packet-ieee80211.h /* that's why I specify these two dissector files
*/
Thanks for your patience to read through this mail. Any suggestions coming
from you will give me great help.
Cheers
John
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