Re: DLT_ request

[marc hermstein <mhermstein () yahoo com>]

Yes, live serial port capture does sound like a useful
enhancement. However, for now I am going to keep it
file-based and write code that extracts the LLC data
from a log file and outputs it in libpcap. In
conjunction with LLC, RLC/MAC blocks (the next layer
'down' on the air interface side) are being output by
the logger and some other debugging info.

--- Guy Harris <guy () alum mit edu> wrote:

> marc hermstein wrote:
> > When developing a handset, some manufacturers dump
> > debugging data from the protocol stack out the
> serial
> > port on the bottom of the handset. This is what I
> > meant by a "logger".
>
> So you'll be writing, or have written, a piece of
> code that reads from 
> the serial port and writes to a libpcap file?  Or is
> there already 
> software that logs the debugging data in another
> format (in which case 
> you might be able to modify Ethereal's Wiretap
> library to read those files)?
>
> It might be interesting to add to libpcap a module
> to do live captures 
> on a serial port.  There will probably be other
> types of capturing 
> people would want to do on serial ports, so there
> might eventually be a 
> generic "serial port" capture module supporting
> multiple DLT_ types. 
> There might have to be a way to specify the baud
> rate, bits per 
> character, parity, etc. - the current
> "pcap_open_live()" API can't do 
> that, but I'm thinking of a future open API that'd
> take an 
> attribute/value list of options (so that it could,
> for example, have 
> options to support "monitor mode" and setting the
> channel for 802.11), 
> so that the option list could be extended without
> API changes (there 
> might also be a way to find out what devices offer
> what options, so that 
> applications such as Ethereal could offer GUI
> options).
>
> However, some or all of the serial port settings
> might be implied by the 
> protocol, in which case they wouldn't have to be
> specified.
> -
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