On Wed, 22 Nov 2006, offset wrote: > I'm a newbie for USB, so please be gentle :) > > I'm trying to examine the traffic between a usb device and the windows > driver for the usb device using VMware and usbfs. > > I've got usbcore.usbfs_snoop=1 working properly and running klogd -f > <output> (so I dont muddy up my syslog) and I am seeing the traffic for > the usb devices I am examining. > > Now for the newbie questions. > > 1) Is using klogd -f the best way for me to get a stream of data for > the usb device? The output is still in text format and if this is the > correct way to get to the data, I'm considering writing a parser to > convert all of the data: <hex> <hex> information into a binary stream > that I can then examine.
There is no way currently to get the data in binary form. Instead of using usbfs_snoop you could consider using usbmon (see Documentation/usb/usbmon.txt). > 2) I've noticed in the klogd -f output, it appears that klogd puts in > <6> for the majority of the usb traffic that I need, but sometimes I > will see a small amount of data with <4>. Is there a case where usb > communication would be logged at the <6> and <4> level for the usb > device? Not sure why I would be seeing different levels of klog > traffic. <4> is KERN_WARNING and <6> is KERN_INFO; people prefer to use the symbolic names instead of the numbers. Note that klogd doesn't put those numbers in there; the kernel itself does when the messages are created. Some messages are logged as warnings, but all the usbfs_snoop messages are at the INFO level. If you provided some examples it would be easier to answer your question. Alan Stern ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
