question about checking for HW RNG support on apu4 appliance

[Robin Roevens <robin.roevens@disroot.org>]

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Hi all

If I understand it correctly, when HW RNG is supported, the Random
Number Generator Daemon (rngd) should be running ?

So in my Zabbix monitoring template for IPFire, I try to check if HW
RNG is available and if so, I monitor the state of the rngd daemon.

Previously I had no HW RNG support on the apu4 appliance until a few
core updates ago where this was introduced with a firmware update. So
now the rngd daemon is automatically started on the appliance. 

To know if HW RNG is supported, I currently check the contents of
/proc/cpuinfo for the occurrence of the string "rdrand" (which seems a
correct check on x86_64 machines) but this string was and still is not
present on the apu4 appliance. 
So I was wondering if anyone knows how to correctly check if HW RNG
support is available? So that this check works for all platforms.

Sidenote: This information (HW RNG support / rndg daemon state) was
previously also available on the entropy page of the IPFire GUI, but it
seems this info is now gone together with the now obsolete entropy
graph. Was this intentional ? I assume that information is still
relevant even when with the entropy value gone?

Thanks

Robin

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