Dual-stack sfcapd Listener

[bnerickson]

Apologies if this has been asked/answered before.

Setup:
OS: Rocky Linux 10.1
Kernel: 6.12.0-124.8.1.el10_1.x86_64
nfdump version: nfdump-1.7.7-1.el10_2.x86_64 / nfdump-libs-1.7.7-1.el10_2.x86_64

Background: I currently use an archaic version of nfsen to parse/display sflow data from Linux machines in LibreNMS. My environment is dual-stack and I serve up an _sflow SRV DNS record for those hosts to export sflow data to with hsflowd. sfcapd is running in the background. Here's a sample of the sfcapd command running on the LibreNMS host:

/usr/bin/sfcapd -D -p 6343 -u librenms -g librenms -B 200000 -S 1 -P /var/nfsen/var/run/p6343.pid -z -n hostname,192.168.0.97,/opt/librenms/rrd/profiles-data/live/hostname

Question: Is there any interest in adding simultaneous dual-stack support to sfcapd or would it be too difficult/impossible? Ideally I'd like to have something like the following running and instead of creating a dummy sflow entry in DNS to only return an A entry for my LibreNMS host I could just point the Linux machines at the LibreNMS A/AAAA entry:

/usr/bin/sfcapd -4 -6 -D -p 6343 -u librenms -g librenms -B 200000 -S 1 -P /var/nfsen/var/run/p6343.pid -z -n hostnamea,192.168.0.97,fd00::ffff:c0a8:61,/opt/librenms/rrd/profiles-data/live/hostnamea

[phaag]

The code can be adapted to listen by default in dual stack mode. That should not be that complicated.
I will move this into issues, so it can be tracked accordingly.