router/functions: replace while-read with grep for bulk IP/domain splitting

router/functions

@@ -62,20 +62,19 @@ cat_expanded() {
 #    or: get_ipv4_list_bulk domains.txt
 get_ipv4_list_bulk()
 {
-    # read from file arg or stdin
+    local input=$(mktemp)
     local domains=$(mktemp)
     local adns_out=$(mktemp)
-    trap "rm -f $domains $adns_out" RETURN
-
-    # Read domains, skip IPs (output them directly)
-    while read -r entry ; do
-        [ -z "$entry" ] && continue
-        if is_ipv4 "$entry" ; then
-            echo "$entry"
-        else
-            echo "$entry" >> "$domains"
-        fi
-    done < "${1:-/dev/stdin}"
+    trap "rm -f $input $domains $adns_out" RETURN
+
+    # Save input, strip empty lines and comments
+    grep -v '^#\|^$' < "${1:-/dev/stdin}" > "$input"
+
+    # Output IPs/subnets directly (fast grep, no per-line bash loop)
+    grep -E '^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]' "$input"
+
+    # Collect non-IP entries as domains to resolve
+    grep -vE '^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]' "$input" > "$domains"
 
     [ -s "$domains" ] || return 0
 
@@ -107,19 +106,19 @@ get_ipv4_list_bulk()
 #    or: get_ipv6_list_bulk domains.txt
 get_ipv6_list_bulk()
 {
+    local input=$(mktemp)
     local domains=$(mktemp)
     local adns_out=$(mktemp)
-    trap "rm -f $domains $adns_out" RETURN
-
-    # Read domains, skip IPs (output them directly)
-    while read -r entry ; do
-        [ -z "$entry" ] && continue
-        if is_ipv6 "$entry" ; then
-            echo "$entry"
-        elif ! is_ipv4 "$entry" ; then
-            echo "$entry" >> "$domains"
-        fi
-    done < "${1:-/dev/stdin}"
+    trap "rm -f $input $domains $adns_out" RETURN
+
+    # Save input, strip empty lines and comments
+    grep -v '^#\|^$' < "${1:-/dev/stdin}" > "$input"
+
+    # Output IPv6 addresses directly
+    grep ':' "$input"
+
+    # Collect domains (not IPv4, not IPv6) to resolve
+    grep -v ':\|^[0-9]*\.[0-9]*\.[0-9]*\.[0-9]' "$input" > "$domains"
 
     [ -s "$domains" ] || return 0