route-update: use list_has_domains() for reliable domain detection

router/functions

@@ -89,6 +89,10 @@ is_ipv4()
     echo "$1" | grep -q -E "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)"
 }
 
+# Check if a list file contains domain names (not just IPs/subnets)
+# Returns 0 if domains found, 1 if IP-only
+list_has_domains() { grep -v '^#' "$1" | grep -vE '^$|^[0-9./]+$|^[0-9a-f:/]+$' | grep -q . ; }
+
 is_ipv6()
 {
     echo "$1" | grep -q ':'

router/route-update.sh

@@ -524,7 +524,7 @@ resolve_list_file()
 
     vlog "$_tag$_label resolving..."
     > "$_resolved_new.tmp"
-    if grep -v '^#' "$_f" | grep -q '[g-zG-Z]' ; then
+    if list_has_domains "$_f" ; then
         cat_expanded "$_f" | grep -v '^#' | grep -v '^$' | $_resolve_func | \
             grep -v '^#' | grep -v '^$' >> "$_resolved_new.tmp"
     else
@@ -553,7 +553,7 @@ resolve_list_file()
     rm -f "$_resolved_new.tmp"
 
     # Accumulate resolve history (DNS round-robin) — only for lists with domains
-    if grep -v '^#' "$_f" | grep -q '[g-zG-Z]' ; then
+    if list_has_domains "$_f" ; then
         local history_dir="$STATE_DIR/$_state/resolve_history"
         mkdir -p "$history_dir"
         rm -f "$history_dir/$HISTORY_SIZE"
@@ -571,7 +571,7 @@ resolve_list_file()
     fi
 
     # Detect volatile domains (IPv4 and IPv6)
-    if grep -v '^#' "$_f" | grep -q '[g-zG-Z]' ; then
+    if list_has_domains "$_f" ; then
         local _vname=$(echo "$_tag" | tr -d '[]')
         local _rtype="A"
         [ "$_ipcmd" = "ip -6" ] && _rtype="AAAA"