From: Matt Corallo <git@bluematt.me>
Date: Tue, 9 Jul 2024 18:45:34 +0000 (+0000)
Subject: Don't spuriously error printing drop counts when there are no rules
X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=commitdiff_plain;h=1a37034c514fd3c131a1060b9a0802e1d0897538;p=flowspec-xdp

Don't spuriously error printing drop counts when there are no rules
---

diff --git a/dropcount.sh b/dropcount.sh
index 6278955..6960ef9 100755
--- a/dropcount.sh
+++ b/dropcount.sh
@@ -34,8 +34,10 @@ echo "$MAP_CONTENTS" | {
 	echo -e "${PACKETS[2]}\t$(( ${BYTES[2]} / 1000 ))\tInvalid/rejected IHL IPv4 field"
 	echo -e "${PACKETS[3]}\t$(( ${BYTES[3]} / 1000 ))\tRejected IPv6 fragments"
 	C=4
-	while read LINE; do
-		echo -e "${PACKETS["$C"]}\t$(( ${BYTES["$C"]} / 1000 ))\t$LINE"
-		C=$(( $C + 1 ))
-	done < "$(dirname ${BASH_SOURCE[0]})/installed-rules.txt"
+	if [ "$(wc -l "$(dirname ${BASH_SOURCE[0]})/installed-rules.txt")" != "0" ]; then
+		while read LINE; do
+			echo -e "${PACKETS["$C"]}\t$(( ${BYTES["$C"]} / 1000 ))\t$LINE"
+			C=$(( $C + 1 ))
+		done < "$(dirname ${BASH_SOURCE[0]})/installed-rules.txt"
+	fi
 }