Re: Request for a DLT code for IPMB packet

[Guy Harris <guy () alum mit edu>]

On Aug 13, 2007, at 11:45 AM, Toeung, Chanthy wrote:

> > So presumably the first byte of the packet data will be the slave  
> > address, followed by the netFn and LUN, followed by the checksum,  
> > etc.?
>
> yes. It is correct.

OK, DLT_IPMB has been assigned the value 199.

> > Capture type, or DLT_ type?
>
> I need DLT_ type. I already develop the code for the package by  
> using the DLT_USR14 for this packet.
> Actually, i know that pcap*.c doesn't support I2C. So i have also  
> build a "Capture engine" to catch raw data from I2C, then save it in  
> a file under  hexdump format.
> After that i will use text2pcap to transfrom this file into pcap  
> file format, then it can be open with Wireshark.

Actually, it might be easier just to save it in libpcap format, using,  
for example, the pcap_dump routines in libpcap.

You might also be able to put that capture engine into libpcap, so  
Wireshark, for example, could do the capturing directly.

> > See, for example, the Linux Bluetooth and USB capture devices for
> > examples.  Unfortunately, there's no "how to add a new type of  
> > capture
> > device" documentation - and the interface for that will probably  
> > change
> > at some point.
>
> where can i find the example of USB capture devices ?

In the "current tar" version of libpcap, see "pcap-usb-linux.c" and  
"pcap-usb-linux.h".
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