Re: Testing wanted for Linux NFC subsystem

Le vendredi 14 mai 2021 à 08:23 -0700, Mark Greer a écrit :

On Thu, May 13, 2021 at 05:37:19PM +0200, Stephan Gerhold wrote:

quoted

On Thu, May 13, 2021 at 07:48:55AM -0700, Mark Greer wrote:

quoted

On Thu, May 13, 2021 at 01:49:53PM +0200, Stephan Gerhold wrote:

quoted

I have a couple of "recycled" smartphones running mainline Linux
and some of them do have NFC chips. I have two with NXP PN547
(supported by nxp,nxp-nci-i2c), one with Samsung S3FWRN5
(samsung,s3fwrn5-i2c) and even one with Broadcom BCM2079x I think
(this one does not have a driver for the Linux NFC subsystem sadly).

+Cc phone-devel@vger.kernel.org, in case other people there are
interested in NFC :)

The NXP/Samsung ones seems to work just fine. However, since there are
barely any userspace tools making use of Linux NFC all my testing so far
was limited to polling for devices with "nfctool" and being happy enough
when it realizes that I hold some NFC tag close to the device. :S

There is a user-level daemon that is the counterpart for the in-kernel
NFC subsystem.  It is called neard and is available here:

        git://git.kernel.org/pub/scm/network/nfc/neard.git

There are a few test script in it that will let you read and write NFC
tags, and do some other things.  We can add some more tests to that set
as we go.

Yeah, I packaged that for Alpine Linux / postmarketOS.
"nfctool" also comes from "neard" as far as I can tell :)

I think I also played with the Neard test scripts a bit at some point,
and managed to read some NFC tag thing inside an old Yubikey NEO
that I found, but didn't really know what else to do.

Yeah, there isn't a whole lot you can do but beyond reading/writing
tags and peer-to-peer, there are things like Bluetooth and Wifi
handover, Android Application Record support, and at least some
support for Secure Engine.

Could sniffing and injection work, like for wifi ?
Guess that depends on specific chip drivers, and libpcap support for sniffing ?

https://wiki.wireshark.org/SampleCaptures#Radio_Frequency_Identification_.28RFID.29.2C_and_Near-Field_Communication_.28NFC.29

https://code.google.com/archive/p/wireshark-nfc/