Re: Request for DLT for new BlueZ Monitor

[Michal Labedzki <michal.labedzki () tieto com>]

Hello,

You can see code in Wireshark side (great example, very similar, but
this is only support for capture file changes):
https://bugs.wireshark.org/bugzilla/attachment.cgi?id=12394

Implementation in libpcap is very similar to pcap-bt-linux.c, but:
1. There is only one interface, let call it bluetooth-monitor
2. Pseudo header is:
    guint16   adapter_id;
    guint16   opcode;

It based on btsnoop header (this two variables are in one 32 bit field
called "flags")

3. Socket changes from
    addr.hci_family = AF_BLUETOOTH;
    addr.hci_dev = handlep->dev_id;
    addr.hci_channel = HCI_CHANNEL_RAW;

to:
    addr.hci_family = AF_BLUETOOTH;
    addr.hci_dev = HCI_DEV_NONE;
    addr.hci_channel = HCI_CHANNEL_MONITOR;

4. "Direction" (frame) based on "opcode"
, timestamps got from socket "SCM_TIMESTAMP".

5. Implementation from libpcap is ready, maybe you want to see it?

On 30 December 2013 00:12, Guy Harris <guy () alum mit edu> wrote:
> On Dec 27, 2013, at 3:13 AM, Michal Labedzki <michal.labedzki () tieto com> wrote:
>
> > 1. Bluetooth Linux Monitor use psedoheader to provide Opcode and
> > Adater Id which are required to correctly dissect payload (like
> > Bluetooth H4 with pseudoheader)
>
> What is the detailed format of the pseudo-header, and what is the payload that follows it?



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Pozdrawiam / Best regards
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Michał Łabędzki, Software Engineer
Tieto Corporation

Product Development Services

http://www.tieto.com / http://www.tieto.pl
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