Make script check_postfwd.sh compartible with Debian 11 (bullseye).

check_postfwd.sh

@@ -73,6 +73,41 @@ trim() {
     echo -n "$var"
 }
 
+trim_double_quotes() {
+    local var="$*"
+    var="${var#"${var%%[!\"]*}"}"   # remove leading whitespace characters
+    var="${var%"${var##*[!\"]}"}"   # remove trailing whitespace characters
+    echo -n "$var"
+}
+
+read_env_from_file() {
+
+   _file="$*"
+
+   while read _ENV _REST ; do
+
+      _ENV="$(trim $_ENV)"
+
+      if [[ "$_ENV" =~ .{2,}=.+ ]]; then
+         _key="${_ENV%=*}"
+         _val="${_ENV##*=}"
+
+
+         # - Remove leading / trailling double quotes
+         # -    _val="${_val%\"}"
+         # -    _val="${_val#\"}"
+         # -
+         _val="$(trim_double_quotes $_val)"
+
+         if [[ -n "$(trim $_key)" ]] && [[ -n "$(trim $_val)" ]] ; then
+            export $_ENV
+         fi
+      fi
+
+   done < "$_file"
+
+}
+
 
 #---------------------------------------
 #-----------------------------
@@ -145,9 +180,12 @@ if [[ -n "$SYSTEMD_SERVICE" ]] ; then
       check_string_ps="$(trim $(cat "$_systemd_service_file" | grep ExecStart | grep -o -E "ExecStart\s*=\s*[^[:space:]]+" | cut -d "=" -f2))"
    fi
 else
-   check_string_ps="$(trim $(cat "$SYSV_INIT_SCRIPT" | grep DAEMON | grep -o -E "DAEMON\s*=\s*[^[:space:]]+" | cut -d "=" -f2))"
-fi
 
+   read_env_from_file $SYSV_INIT_SCRIPT
+
+   _check_string_ps="$(trim $(cat "$SYSV_INIT_SCRIPT" | grep DAEMON | grep -o -E "DAEMON\s*=\s*[^[:space:]]+" | cut -d "=" -f2))"
+   check_string_ps="$(eval echo "$_check_string_ps")"
+fi
 
 
 #---------------------------------------