hostapd: re-introduce process tracking

Before commit 60fb4c92 ("hostapd: add ubus reload") netifd was
tracking hostapd/wpa_supplicant and restarting wifi in case of a
process crash. Restore this behaviour by tracking the PIDs of
hostapd and wpa_supplicant.
Also make sure hostapd and/or wpa_supplicant have been started before
emmitting ubus calls to them using ubus wait_for.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh

@@ -940,7 +940,10 @@ drv_mac80211_setup() {
 			}
 		else
 			add_ap=1
+			ubus wait_for hostapd.$phy
 			ubus call hostapd.${phy} config_add "{\"iface\":\"$primary_ap\", \"config\":\"${hostapd_conf_file}\"}"
+			local hostapd_pid=$(ubus call service list '{"name": "hostapd"}' | jsonfilter -l 1 -e "@['hostapd'].instances['hostapd-${phy}'].pid")
+			wireless_add_process "$hostapd_pid" "/usr/sbin/hostapd" 1
 		fi
 		ret="$?"
 		[ "$ret" != 0 ] && {

package/network/services/hostapd/files/hostapd.sh

@@ -958,6 +958,7 @@ wpa_supplicant_run() {
 
 	_wpa_supplicant_common "$ifname"
 
+	ubus wait_for wpa_supplicant.$phy
 	ubus call wpa_supplicant.$phy config_add "{ \
 		\"driver\": \"${_w_driver:-wext}\", \"ctrl\": \"$_rpath\", \
 		\"iface\": \"$ifname\", \"config\": \"$_config\" \
@@ -969,6 +970,9 @@ wpa_supplicant_run() {
 
 	[ "$ret" != 0 ] && wireless_setup_vif_failed WPA_SUPPLICANT_FAILED
 
+	local supplicant_pid=$(ubus call service list '{"name": "hostapd"}' | jsonfilter -l 1 -e "@['hostapd'].instances['supplicant-${phy}'].pid")
+	wireless_add_process "$supplicant_pid" "/usr/sbin/wpa_supplicant" 1
+
 	return $ret
 }