fixed regular expression in live nameserver parsing function

skyweave/utils.lua

@@ -162,29 +162,32 @@ function utils.get_live_interface_info(interface_name)
     return nil
 end
 
--- Moved from original main script
 function utils.get_live_dns_servers_from_resolv(logical_interface_name)
     local dns_servers = {}
     local search_domains = {}
-    -- Ensure logical_interface_name is somewhat safe before using in string matching,
-    -- though it's typically from internal config.
+
     if not logical_interface_name or not logical_interface_name:match("^[a-zA-Z0-9_%-]+$") then
-        return dns_servers, search_domains -- Invalid interface name format
+        return dns_servers, search_domains
     end
 
     local file = io.open("/tmp/resolv.conf.auto", "r")
     if not file then return dns_servers, search_domains end
 
     local in_target_section = false
-    local section_start_pattern_str = "# Interface " .. logical_interface_name
+    -- It looks for the logical_interface_name followed by an optional underscore and digits (e.g., "_4"),
+    -- and then the end of the line. This prevents "wan" from incorrectly matching "wan_lte_".
+    local section_start_pattern = "^%s*# Interface%s+" .. logical_interface_name .. "(_%d+)?%s*$"
 
     for line in file:lines() do
         if not in_target_section then
-            if line:match("^%s*" .. section_start_pattern_str:gsub("%%", "%%%%") .. "%s*$") then -- Escape % for string pattern
+            -- We now use the more precise pattern to find our starting point.
+            if line:match(section_start_pattern) then
                 in_target_section = true
             end
         else
-            if line:match("^%s*# Interface ") and not line:match("^%s*" .. section_start_pattern_str:gsub("%%", "%%%%") .. "%s*$") then
+            -- The end-of-section logic is now also hardened. We break if we find a new
+            -- "# Interface" line that does NOT match our precise pattern.
+            if line:match("^%s*# Interface") and not line:match(section_start_pattern) then
                 break
             end