X-Git-Url: https://git.rvb.name/lua-squid-acl-helper.git/blobdiff_plain/2e41ad1dc4bac0a74a64a14fabec46bd0aeb7fae..974503f46c01638519f9af457e849d88712c28bd:/src/arpcache.lua

diff --git a/src/arpcache.lua b/src/arpcache.lua
index 1ae8136..b4b8478 100644
--- a/src/arpcache.lua
+++ b/src/arpcache.lua
@@ -4,19 +4,25 @@ config = require "config"
 
 _arpcache = {}
 _ARPCACHE4 = '/sbin/ip -4 n'
-_ARPCACHE6 = '/sbin/ip -6 n'
 
 function _match_v4(ip)
   return string.match(ip,"%d*%.%d*%.%d*%.%d*")
 end
 
+_arpcache.cache = {}
+
 function _arpcache.get_mac(ip)
 
+  local rec = _arpcache.cache[ip]
+  if rec and rec.timestamp+config.arp_ttl > os.time() then
+    return rec["mac"]
+  end
+
   local cmd
   if _match_v4(ip) then
     cmd = _ARPCACHE4
   else
-    cmd = _ARPCACHE6
+    return "OK"
   end
 
   local f = io.popen(cmd)
@@ -38,11 +44,16 @@ function _arpcache.get_mac(ip)
 
     if w[1]==ip then
       res = w[5]
+      
       break
     end
 
   end 
 
+  if res then
+    _arpcache.cache[ip] = { mac = res, timestamp = os.time() }
+  end
+
   f:close()
   return res