nRF Sniffer Linux Lock File Permissions Problem

[glassthumb]

I have successfully setup my nRF51822 chip with Wireshark to capture BLE packets, using the 4.0.0 release of the nRF Sniffer software (extcap folder). However, the capture interface only shows up on Wireshark when I run Wireshark as root.

One issue I have identified as causing this is that the lockfile the extcap software tries to create fails (PermissionError: [Errno 13] Permission denied: '/var/lock/LCK..ttyUSB0').

However, even removing this from the script, it still does not show up in Wireshark when run without root privileges.

Any guidance as to how to avoid running Wireshark as root in this situation would be helpful.

[Håkon Alseth]

Hi,

 

Could this be the reason for the user permission issue?

https://askubuntu.com/questions/133235/how-do-i-allow-non-root-access-to-ttyusb0

 

Kind regards,

Håkon

[glassthumb]

Initially this was an issue, but I installed nrf-udev which changes the permissions on the serial port when plugged in. Now it seems to be related to the lock file.

[Håkon Alseth]

Hi,

 

(PermissionError: [Errno 13] Permission denied: '/var/lock/LCK..ttyUSB0').

I think this is a stale lock file from a previous (root) session. Have you tried deleting it, and see if this then helps the scenario?

 

Kind regards,

Håkon

[glassthumb]

Thanks for the reply. I just confirmed that the lock file doesn't exist, but it seems to be related to permissions on the /var/lock (symlinked to /run/lock) directory. Changing the permissions on that directory does seem to fix the problem, so appreciate the help!