From 974503f46c01638519f9af457e849d88712c28bd Mon Sep 17 00:00:00 2001
From: Roman Bazalevsky <rvb@rvb.name>
Date: Fri, 1 Nov 2019 23:08:29 +0300
Subject: [PATCH 1/1] =?utf8?q?=D0=94=D0=BE=D0=B1=D0=B0=D0=B2=D0=BB=D0=B5?=
 =?utf8?q?=D0=BD=D0=BE=20=D0=BA=D0=B5=D1=88=D0=B8=D1=80=D0=BE=D0=B2=D0=B0?=
 =?utf8?q?=D0=BD=D0=B8=D0=B5=20=D0=BF=D1=80=D0=B8=D0=B2=D1=8F=D0=B7=D0=BA?=
 =?utf8?q?=D0=B8=20IP-mac.?=
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---
 src/arpcache.lua   | 15 +++++++++++++--
 src/config.lua     |  6 ++++++
 src/connection.lua |  5 +++--
 src/helper.lua     |  4 +++-
 4 files changed, 25 insertions(+), 5 deletions(-)

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 
 
diff --git a/src/config.lua b/src/config.lua
index 6c427cb..842b445 100644
--- a/src/config.lua
+++ b/src/config.lua
@@ -36,6 +36,12 @@ function _config.read(file)
       end
     end 
   end
+
+  _config.arp_ttl = 60
+
+  if cfg["arp-ttl"] then
+    _config.arp_ttl = tonumber(cfg["arp-ttl"])
+  end
   
 end
 
diff --git a/src/connection.lua b/src/connection.lua
index e1eff46..f40dead 100644
--- a/src/connection.lua
+++ b/src/connection.lua
@@ -7,14 +7,15 @@ arpcache = require "arpcache"
 function _connection.auth(serv, localport, remoteport)
 
   local user = config.map_ip(serv)
+  local mac = nil
   
   if not user then
-    local mac = arpcache.get_mac(serv)
+    mac = arpcache.get_mac(serv)
     if mac then
       user = config.map_mac(mac)
     end  
   end
-    
+
   if user == "*ident" then
     user = ident.resolve(serv,localport,config.map_port(remoteport))
   end  
diff --git a/src/helper.lua b/src/helper.lua
index 79711e2..53712c4 100755
--- a/src/helper.lua
+++ b/src/helper.lua
@@ -25,7 +25,9 @@ function main()
   while true do
     str=io.read()
     vals = str:split(" ")
-    status, res = pcall(connection.auth,vals[1],vals[2],vals[3])
+--    status, res = pcall(connection.auth,vals[1],vals[2],vals[3])
+    status = 1
+    res = connection.auth(vals[1],vals[2],vals[3])
     if status then
       if res and res ~= "" then
         io.write("OK user="..res.."\n")
-- 
2.34.1