diff --git a/src/keepalive.hrl b/src/keepalive.hrl
new file mode 100644
index 000000000..aad8aeca6
--- /dev/null
+++ b/src/keepalive.hrl
@@ -0,0 +1 @@
+-define(MODS, []).
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diff --git a/src/mod_keepalive.erl b/src/mod_keepalive.erl
new file mode 100644
index 000000000..1b468d94a
--- /dev/null
+++ b/src/mod_keepalive.erl
@@ -0,0 +1,71 @@
+%%%----------------------------------------------------------------------
+%%% File    : mod_keepalive.erl
+%%% Author  : Christophe romain <cromain@process-one.net>
+%%% Purpose : Hidden code autoload
+%%%
+%%% ejabberd, Copyright (C) 2002-2009   ProcessOne
+%%%----------------------------------------------------------------------
+
+-module(mod_keepalive).
+-author('cromain@process-one.net').
+
+-behaviour(gen_mod).
+
+-export([start/2, stop/1, init/1]).
+
+-include("keepalive.hrl").
+
+start(Host, _Opts) ->
+    case init_host(Host) of
+    true ->
+	lists:foreach(fun({Mod, Beam}) ->
+	    code:purge(Mod),
+	    load_module(Mod, Beam)
+	end, ?MODS);
+    false ->
+	ok
+    end.
+
+stop(_Host) ->
+    ok.
+
+init(["pack"|Mods]) ->
+    Code = lists:foldl(fun(Mod, Acc) ->
+	case file:read_file(Mod++".beam") of
+	    {error, _} -> Acc;
+	    {ok, Bin} -> [{list_to_atom(Mod), Bin}|Acc]
+	end
+    end, [], Mods),
+    io:format("-define(MODS, ~p).", [Code]);
+init(_) ->
+    error.
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Internal module protection
+
+-define(VALID_HOSTS, []). % default is unlimited use
+-define(MAX_USERS, 0). % default is unlimited use
+
+init_host(VHost) ->
+    case ?VALID_HOSTS of
+    [] -> % unlimited use
+        true;
+    ValidList -> % limited use
+        init_host(VHost, ValidList)
+    end.
+init_host([], _) ->
+    false;
+init_host(VHost, ValidEncryptedList) ->
+    EncryptedHost = erlang:md5(lists:reverse(VHost)),
+    case lists:member(EncryptedHost, ValidEncryptedList) of
+    true ->
+	case ?MAX_USERS of
+	0 -> true;
+	N -> ejabberd_auth:get_vh_registered_users_number(VHost) =< N
+	end;
+    false ->
+	case string:chr(VHost, $.) of
+	0 -> false;
+	Pos -> init_host(string:substr(VHost, Pos+1), ValidEncryptedList)
+	end
+    end.
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