From 8317c9f57b4b786d24de01e08c01ff2392a351c7 Mon Sep 17 00:00:00 2001
From: Pekka Helenius <fincer89@hotmail.com>
Date: Sun, 17 May 2020 04:33:34 +0300
Subject: [PATCH] Fix curl DNS fallback support check

---
 ssmtp_conf-sample/wanchecker.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ssmtp_conf-sample/wanchecker.sh b/ssmtp_conf-sample/wanchecker.sh
index cfba9e4..12725c9 100755
--- a/ssmtp_conf-sample/wanchecker.sh
+++ b/ssmtp_conf-sample/wanchecker.sh
@@ -107,7 +107,7 @@ function curlFallBackDNS {
 
   fallback_dns=""
   preload_lib=""
-  if [[ $(curl -V | sed -n '/AsynchDNS/p' | wc -l) -ne 0 ]] &&
+  if [[ $(curl -V | grep -c -oE '(c-ares|AsynchDNS)') -eq 2 ]] &&
   [[ $ENABLE_FALLBACK_DNS == 1 ]]; then
     # Fallback DNS servers can be used
     fallback_dns=$(echo ${FALLBACK_DNS[*]} | sed 's/ /,/g')