From dcd4191fbebe2b3ebc9a56deb014aa0ec61e7af5 Mon Sep 17 00:00:00 2001
From: Johannes Truschnigg <johannes@truschnigg.info>
Date: Sat, 12 Mar 2022 15:06:44 +0100
Subject: [PATCH] Improve wrapper script

---
 lagdetect.sh | 29 +++++++++++++++++++----------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/lagdetect.sh b/lagdetect.sh
index 45224c3..268b24f 100755
--- a/lagdetect.sh
+++ b/lagdetect.sh
@@ -14,18 +14,27 @@ PING_INTERVAL=500
 # DO NOT EDIT BELOW #
 #####################
 
-set -u
-for t in traceroute fping
+for p in traceroute fping awk
 do
-type "$t" || exit 1
+  type "${p}" || { printf 'FATAL: Required program "%s" not installed.\n' "${p}" >&2; exit 1; }
 done
 
-_def_gw_v4=$(traceroute -n -m 1 1.1.1.1 | awk '{if("1" == $1){print $2}}')
+if [ x"${PING_GW_IPV6}" = xyes ]
+then
+  PING_PEERS="$(traceroute -6 -n -m 2001:4860:4860::8888 | awk '{if("1" == $1){print $2}}') ${PING_PEERS}"
+fi
+
+if [ x"${PING_GW_IPV4}" = xyes ]
+then
+  PING_PEERS="$(traceroute -4 -n -m 1 1.1.1.1 | awk '{if("1" == $1){print $2}}') ${PING_PEERS}"
+fi
+
+set -u
 
-fping --loop --retry=1 --size=1280 --period="${PING_INTERVAL}" --random "${_def_gw_v4}" ${PING_PEERS} 2>/dev/null \
+fping --loop --retry=1 --size=1280 --period="${PING_INTERVAL}" --random ${PING_PEERS} 2>/dev/null \
 | awk \
-    -v THRESHOLD="${THRESHOLD}" \
-    -v PINGSLOTS="${PING_SLOTS_PER_PEER}" \
-    -v FUDGE="${FUDGE_MS}" \
-    -v PING_PEERS="${_def_gw_v4} ${PING_PEERS}" \
-    -f __lagdetect.awk
+  -v THRESHOLD="${THRESHOLD}" \
+  -v PINGSLOTS="${PING_SLOTS_PER_PEER}" \
+  -v FUDGE="${FUDGE_MS}" \
+  -v PING_PEERS="${PING_PEERS}" \
+  -f __lagdetect.awk
-- 
2.39.5