duwt/notes.txt at master · linuxlizard/duwt · GitHub

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Make just one subdir/subproject.
	make sub-scandump


String Formatting.
	FMT
	http://fmtlib.net/latest/index.html


Logging.
	Apache log4cxx.
		Might be overkill. Requires apr.
		https://logging.apache.org/log4cxx/latest_stable/usage.html

	Simple.
		https://stackoverflow.com/questions/6168107/how-to-implement-a-good-debug-logging-feature-in-a-project
		http://www.drdobbs.com/cpp/logging-in-c/201804215
		http://www.drdobbs.com/cpp/a-highly-configurable-logging-framework/225700666

	Winner?
		https://github.com/gabime/spdlog


JSON
	https://nlohmann.github.io/json/


Root.
	Need superuser privs to trigger a scan. What's the modern way to do so?

	https://stackoverflow.com/questions/2483755/how-to-programmatically-gain-root-privileges

	https://fedoraproject.org/wiki/Features/RemoveSETUID

	https://www.freedesktop.org/wiki/Software/polkit/


	net/wireless/cfg80211.c
      {
               .cmd = NL80211_CMD_TRIGGER_SCAN,
               .doit = nl80211_trigger_scan,
               .policy = nl80211_policy,
               .flags = GENL_UNS_ADMIN_PERM,  <----------------------
               .internal_flags = NL80211_FLAG_NEED_WDEV_UP |
                                 NL80211_FLAG_NEED_RTNL,
       },

	GENL_UNS_ADMIN_PERM winner winner
	trigger scan CAP_NET_ADMIN it is

	net/netlink/genetlink.c
     if ((ops->flags & GENL_UNS_ADMIN_PERM) &&
           !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
               return -EPERM;