Adding case where there is no import route limit

README.md

@@ -1,3 +1,6 @@
 # nrpe-bird
 
 Collection of scripts used to monitor bird sessions and route limits
+
+It’s not well tested against bird2 yet, but using -4 for either IPv4 and IPv6
+should be sufficient.

check_bgp

@@ -99,11 +99,26 @@ STATE="$($birdc show protocol ${SESSION} | \
 
 ROUTE_LIMIT_IN="$($birdc show protocol all ${SESSION} | \
 	awk '/Receive limit/ { print $3 }')"
+
+# Test if we are on a bird2
+if [ -z ${ROUTE_LIMIT_IN} ]; then
+	ROUTE_LIMIT_IN="$($birdc show protocol all ${SESSION} | \
+		awk '/Import limit/ { print $3 }')"
+fi
+
+# There is no import limit, so no ratio either
+if [ -z ${ROUTE_LIMIT_IN} ]; then
+	RATIO_IN=0
+fi
+
 ROUTES_IMPORTED="$($birdc show protocol all ${SESSION} | grep 'Routes:' | \
 	sed -Ee '/imported/{ s/^.* ([0-9]+) imported.*$/\1/; p;}' -e d)"
 ROUTE_HIT_IN="$($birdc show protocol all ${SESSION} | \
 	grep -E 'Receive limit:.*HIT')"
+
+if [ ! -z ${ROUTE_LIMIT_IN} ]; then
 	RATIO_IN=$(echo "(${ROUTES_IMPORTED}*100)/${ROUTE_LIMIT_IN}" | bc)
+fi
 
 ROUTE_HIT_OUT="$($birdc show protocol all ${SESSION} | \
 	grep -E 'Export limit:.*HIT')"