%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2008-2016. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%%     http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%

-module(ssl_payload_SUITE).

%% Note: This directive should only be used in test suites.
-compile(export_all).

-include_lib("common_test/include/ct.hrl").

-define(TIMEOUT, 600000).

%%--------------------------------------------------------------------
%% Common Test interface functions -----------------------------------
%%--------------------------------------------------------------------
all() -> 
    [
     {group, 'tlsv1.2'},
     {group, 'tlsv1.1'},
     {group, 'tlsv1'},
     {group, 'sslv3'}
    ].

groups() ->
    [
     {'tlsv1.2', [], payload_tests()},
     {'tlsv1.1', [], payload_tests()},
     {'tlsv1', [], payload_tests()},
     {'sslv3', [], payload_tests()}
    ].

payload_tests() ->
    [server_echos_passive_small,
     server_echos_active_once_small,
     server_echos_active_small,
     client_echos_passive_small,
     client_echos_active_once_small,
     client_echos_active_small,
     server_echos_passive_big,
     server_echos_active_once_big,
     server_echos_active_big,
     client_echos_passive_big,
     client_echos_active_once_big,
     client_echos_active_big,
     server_echos_passive_huge,
     server_echos_active_once_huge,
     server_echos_active_huge,
     client_echos_passive_huge,
     client_echos_active_once_huge,
     client_echos_active_huge].

init_per_suite(Config) ->
    catch crypto:stop(),
    try crypto:start() of
	ok ->
	    ssl:start(),
	    {ok, _} = make_certs:all(proplists:get_value(data_dir, Config), proplists:get_value(priv_dir, Config)),
	    ssl_test_lib:cert_options(Config)
    catch _:_  ->
	    {skip, "Crypto did not start"}
    end.

end_per_suite(_Config) ->
    ssl:stop(),
    application:stop(crypto).

init_per_group(GroupName, Config) ->
     case ssl_test_lib:is_tls_version(GroupName) of
	true ->
	    case ssl_test_lib:sufficient_crypto_support(GroupName) of
		true ->
		    ssl_test_lib:init_tls_version(GroupName, Config);
		false ->
		    {skip, "Missing crypto support"}
	    end;
	_ ->
	    ssl:start(),
	    Config
    end.

end_per_group(_GroupName, Config) ->
    Config.

init_per_testcase(TestCase, Config) when TestCase == server_echos_passive_huge;
					 TestCase == server_echos_active_once_huge;
					 TestCase == server_echos_active_huge;
					 TestCase == client_echos_passive_huge;
					 TestCase == client_echos_active_once_huge;
					 TestCase == client_echos_active_huge ->
    ct:timetrap({seconds, 90}),
    Config;

init_per_testcase(TestCase, Config) when TestCase == server_echos_passive_big;
					 TestCase == server_echos_active_once_big;
					 TestCase == server_echos_active_big;
					 TestCase == client_echos_passive_big;
					 TestCase == client_echos_active_once_big;
					 TestCase == client_echos_active_big ->
    ct:timetrap({seconds, 60}),
    Config;

init_per_testcase(_TestCase, Config) ->
    ct:timetrap({seconds, 15}),
    Config.

end_per_testcase(_TestCase, Config) ->
    Config.
%%--------------------------------------------------------------------
%% Test Cases --------------------------------------------------------
%%--------------------------------------------------------------------

server_echos_passive_small() ->
    [{doc, "Client sends 1000 bytes in passive mode to server, that receives them, "
     "sends them back, and closes."}].

server_echos_passive_small(Config) when is_list(Config) -> 
    ClientOpts = ssl_test_lib:ssl_options(client_opts, Config),
    ServerOpts = ssl_test_lib:ssl_options(server_opts, Config),
    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),

    Str = "1234567890", 
    
    server_echos_passive(Str, 1000, ClientOpts, ServerOpts, 
			 ClientNode, ServerNode, Hostname).

%%--------------------------------------------------------------------

server_echos_active_once_small() ->
    [{doc, "Client sends 1000 bytes in active once mode to server, that receives "
     " them, sends them back, and closes."}].

server_echos_active_once_small(Config) when is_list(Config) -> 
        ClientOpts = ssl_test_lib:ssl_options(client_opts, Config),
    ServerOpts = ssl_test_lib:ssl_options(server_opts, Config),
    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),

    Str = "1234567890", 
    
    server_echos_active_once(Str, 1000, ClientOpts, ServerOpts, 
			     ClientNode, ServerNode, Hostname).

%%--------------------------------------------------------------------

server_echos_active_small() ->
    [{doc, "Client sends 1000 bytes in active mode to server, that receives them, "
     "sends them back, and closes."}].

server_echos_active_small(Config) when is_list(Config) -> 
    ClientOpts = ssl_test_lib:ssl_options(client_opts, Config),
    ServerOpts = ssl_test_lib:ssl_options(server_opts, Config),
    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),

    Str = "1234567890", 
    
    server_echos_active(Str, 1000, ClientOpts, ServerOpts, 
			ClientNode, ServerNode, Hostname).

%%--------------------------------------------------------------------
client_echos_passive_small() ->
    [{doc, "Server sends 1000 bytes in passive mode to client, that receives them, "
      "sends them back, and closes."}].

client_echos_passive_small(Config) when is_list(Config) -> 
    ClientOpts = ssl_test_lib:ssl_options(client_opts, Config),
    ServerOpts = ssl_test_lib:ssl_options(server_opts, Config),
    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),

    Str = "1234567890", 

    client_echos_passive(Str, 1000, ClientOpts, ServerOpts, ClientNode, 
			 ServerNode, Hostname).

%%--------------------------------------------------------------------
client_echos_active_once_small() ->
    ["Server sends 1000 bytes in active once mode to client, that receives "
     "them, sends them back, and closes."].

client_echos_active_once_small(Config) when is_list(Config) -> 
    ClientOpts = ssl_test_lib:ssl_options(client_opts, Config),
    ServerOpts = ssl_test_lib:ssl_options(server_opts, Config),
    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),

    Str = "1234567890", 
    
    client_echos_active_once(Str, 1000, ClientOpts, ServerOpts, ClientNode, 
			     ServerNode, Hostname).
   
%%--------------------------------------------------------------------
client_echos_active_small() ->
    [{doc, "Server sends 1000 bytes in active mode to client, that receives them, "
      "sends them back, and closes."}].

client_echos_active_small(Config) when is_list(Config) -> 
    ClientOpts = ssl_test_lib:ssl_options(client_opts, Config),
    ServerOpts = ssl_test_lib:ssl_options(server_opts, Config),
    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),

    Str = "1234567890",     

    client_echos_active(Str, 1000, ClientOpts, ServerOpts, ClientNode, 
			ServerNode, Hostname).


%%--------------------------------------------------------------------
server_echos_passive_big() ->
    [{doc, "Client sends 50000 bytes to server in passive mode, that receives them, "
     "sends them back, and closes."}].

server_echos_passive_big(Config) when is_list(Config) -> 
    ClientOpts = ssl_test_lib:ssl_options(client_opts, Config),
    ServerOpts = ssl_test_lib:ssl_options(server_opts, Config),
    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),

    Str = "1234567890", 
    
    server_echos_passive(Str, 50000, ClientOpts, ServerOpts, ClientNode, 
			 ServerNode, Hostname).

%%--------------------------------------------------------------------

server_echos_active_once_big() ->
    [{doc,"Client sends 50000 bytes to server in active once mode, that receives "
      "them, sends them back, and closes."}].

server_echos_active_once_big(Config) when is_list(Config) -> 
    ClientOpts = ssl_test_lib:ssl_options(client_opts, Config),
    ServerOpts = ssl_test_lib:ssl_options(server_opts, Config),
    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),

    Str = "1234567890", 
    
    server_echos_active_once(Str, 50000, ClientOpts, ServerOpts, ClientNode, 
			     ServerNode, Hostname).

%%--------------------------------------------------------------------

server_echos_active_big() ->
    [{doc, "Client sends 50000 bytes to server in active once mode, that receives "
      " them, sends them back, and closes."}].

server_echos_active_big(Config) when is_list(Config) -> 
    ClientOpts = ssl_test_lib:ssl_options(client_opts, Config),
    ServerOpts = ssl_test_lib:ssl_options(server_opts, Config),
    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),

    Str = "1234567890", 
    
    server_echos_active(Str, 50000, ClientOpts, ServerOpts, ClientNode, 
			ServerNode, Hostname).

%%--------------------------------------------------------------------
client_echos_passive_big() ->
    [{doc, "Server sends 50000 bytes to client in passive mode, that receives them, "
     "sends them back, and closes."}].

client_echos_passive_big(Config) when is_list(Config) -> 
    ClientOpts = ssl_test_lib:ssl_options(client_opts, Config),
    ServerOpts = ssl_test_lib:ssl_options(server_opts, Config),
    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),

    Str = "1234567890", 

    client_echos_passive(Str, 50000, ClientOpts, ServerOpts, ClientNode, 
			 ServerNode, Hostname).

%%--------------------------------------------------------------------
client_echos_active_once_big() ->
    [{doc, "Server sends 50000 bytes to client in active once mode, that receives"
      " them, sends them back, and closes."}].

client_echos_active_once_big(Config) when is_list(Config) -> 
    ClientOpts = ssl_test_lib:ssl_options(client_opts, Config),
    ServerOpts = ssl_test_lib:ssl_options(server_opts, Config),
    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),

    Str = "1234567890", 

    client_echos_active_once(Str, 50000, ClientOpts, ServerOpts, ClientNode, 
			     ServerNode, Hostname).
   
%%--------------------------------------------------------------------
client_echos_active_big() ->
    [{doc, "Server sends 50000 bytes to client in active mode, that receives them, "
      "sends them back, and closes."}].

client_echos_active_big(Config) when is_list(Config) -> 
     ClientOpts = ssl_test_lib:ssl_options(client_opts, Config),
    ServerOpts = ssl_test_lib:ssl_options(server_opts, Config),
    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),

    Str = "1234567890", 
    
    client_echos_active(Str, 50000, ClientOpts, ServerOpts, ClientNode, 
			ServerNode, Hostname).

%%--------------------------------------------------------------------
server_echos_passive_huge() ->
    [{doc, "Client sends 500000 bytes to server in passive mode, that receives "
      " them, sends them back, and closes."}].

server_echos_passive_huge(Config) when is_list(Config) -> 
    ClientOpts = ssl_test_lib:ssl_options(client_opts, Config),
    ServerOpts = ssl_test_lib:ssl_options(server_opts, Config),
    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),

    Str = "1234567890", 
    
    server_echos_passive(Str, 500000, ClientOpts, ServerOpts, ClientNode, 
			 ServerNode, Hostname).

%%--------------------------------------------------------------------
server_echos_active_once_huge() ->
    [{doc, "Client sends 500000 bytes to server in active once mode, that receives "
      "them, sends them back, and closes."}].

server_echos_active_once_huge(Config) when is_list(Config) -> 
        ClientOpts = ssl_test_lib:ssl_options(client_opts, Config),
    ServerOpts = ssl_test_lib:ssl_options(server_opts, Config),
    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),

    Str = "1234567890", 
    
    server_echos_active_once(Str, 500000, ClientOpts, ServerOpts, ClientNode, 
			     ServerNode, Hostname).

%%--------------------------------------------------------------------
server_echos_active_huge() ->
    [{doc, "Client sends 500000 bytes to server in active mode, that receives them, "
     "sends them back, and closes."}].

server_echos_active_huge(Config) when is_list(Config) -> 
    ClientOpts = ssl_test_lib:ssl_options(client_opts, Config),
    ServerOpts = ssl_test_lib:ssl_options(server_opts, Config),
    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),

    Str = "1234567890", 
    
    server_echos_active(Str, 500000, ClientOpts, ServerOpts, ClientNode, 
			ServerNode, Hostname).

%%--------------------------------------------------------------------
client_echos_passive_huge() ->
    [{doc, "Server sends 500000 bytes to client in passive mode, that receives "
     "them, sends them back, and closes."}].

client_echos_passive_huge(Config) when is_list(Config) -> 
    ClientOpts = ssl_test_lib:ssl_options(client_opts, Config),
    ServerOpts = ssl_test_lib:ssl_options(server_opts, Config),
    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),

    Str = "1234567890", 
    client_echos_passive(Str, 500000, ClientOpts, ServerOpts, ClientNode, 
			 ServerNode, Hostname).

%%--------------------------------------------------------------------
client_echos_active_once_huge() ->
    [{doc, "Server sends 500000 bytes to client in active once mode, that receives "
      "them, sends them back, and closes."}].

client_echos_active_once_huge(Config) when is_list(Config) -> 
    ClientOpts = ssl_test_lib:ssl_options(client_opts, Config),
    ServerOpts = ssl_test_lib:ssl_options(server_opts, Config),
    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),

    Str = "1234567890", 
    client_echos_active_once(Str, 500000, ClientOpts, ServerOpts, ClientNode, 
			     ServerNode, Hostname).
   
%%--------------------------------------------------------------------
client_echos_active_huge() ->
    [{doc, "Server sends 500000 bytes to client in active mode, that receives them, "
     "sends them back, and closes."}].

client_echos_active_huge(Config) when is_list(Config) -> 
     ClientOpts = ssl_test_lib:ssl_options(client_opts, Config),
    ServerOpts = ssl_test_lib:ssl_options(server_opts, Config),
    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),

    Str = "1234567890", 
    client_echos_active(Str, 500000, ClientOpts, ServerOpts, ClientNode,
			ServerNode, Hostname).
 
%%--------------------------------------------------------------------
%% Internal functions ------------------------------------------------
%%--------------------------------------------------------------------

server_echos_passive(Data, Length, ClientOpts, ServerOpts, 
		     ClientNode, ServerNode, Hostname) ->
    Server = ssl_test_lib:start_server([{node, ServerNode}, {port, 0}, 
					{from, self()}, 
					{mfa, 
					 {?MODULE, echoer, 
					  [Data, Length]}},
					{options, 
					 [{active, false},{mode, binary} 
					  | ServerOpts]}]),
				       Port = ssl_test_lib:inet_port(Server),
    Client = ssl_test_lib:start_client([{node, ClientNode}, {port, Port}, 
					{host, Hostname},
					{from, self()}, 
					{mfa, 
					 {?MODULE, sender, 
					       [Data, 
						Length]}},
					{options, 
					 [{active, false}, {mode, binary} |
					  ClientOpts]}]),
    ssl_test_lib:check_result(Server, ok, Client, ok),
    
    ssl_test_lib:close(Server),
    ssl_test_lib:close(Client).


server_echos_active_once(Data, Length, ClientOpts, ServerOpts, ClientNode,
			 ServerNode, Hostname) ->
    Server = ssl_test_lib:start_server([{node, ServerNode}, {port, 0}, 
					{from, self()}, 
					{mfa, 
					 {?MODULE, echoer_once, 
					  [Data, Length]}},
					{options, [{active, once},
						   {mode, binary}| 
						   ServerOpts]}]),
    Port = ssl_test_lib:inet_port(Server),
    Client = ssl_test_lib:start_client([{node, ClientNode}, {port, Port}, 
					{host, Hostname},
					{from, self()}, 
					{mfa, 
					 {?MODULE, sender_once, 
					  [Data, Length]}},
					{options, [{active, once}, 
						   {mode, binary} | 
						   ClientOpts]}]),
    ssl_test_lib:check_result(Server, ok, Client, ok),
    
    ssl_test_lib:close(Server),
    ssl_test_lib:close(Client).


server_echos_active(Data, Length, ClientOpts, ServerOpts, 
		    ClientNode, ServerNode, Hostname) ->
    Server = ssl_test_lib:start_server([{node, ServerNode}, {port, 0}, 
					{from, self()}, 
					{mfa, 
					 {?MODULE, echoer_active, 
					  [Data, Length]}},
					{options,  
					 [{active, true},
					  {mode, binary} | ServerOpts]}]),
    Port = ssl_test_lib:inet_port(Server),
    Client = ssl_test_lib:start_client([{node, ClientNode}, {port, Port}, 
					{host, Hostname},
					{from, self()}, 
					{mfa, 
					 {?MODULE, sender_active, 
					       [Data, 
						Length]}},
					{options,  
					 [{active, true}, {mode, binary}
					  | ClientOpts]}]),
    ssl_test_lib:check_result(Server, ok, Client, ok),
    
    ssl_test_lib:close(Server),
    ssl_test_lib:close(Client).

client_echos_passive(Data, Length, ClientOpts, ServerOpts, 
		     ClientNode, ServerNode, Hostname) ->
    Server = ssl_test_lib:start_server([{node, ServerNode}, {port, 0}, 
					{from, self()}, 
					{mfa, 
					 {?MODULE, sender, 
					  [Data, Length]}},
					{options, 
					 [{active, false}, {mode, binary} | 
					  ServerOpts]}]),
    Port = ssl_test_lib:inet_port(Server),
    Client = ssl_test_lib:start_client([{node, ClientNode}, {port, Port}, 
					{host, Hostname},
					{from, self()}, 
					{mfa, 
					 {?MODULE, echoer, 
					       [Data, 
						Length]}},
					{options, 
					 [{active, false}, {mode, binary}
					  | ClientOpts]}]),
    ssl_test_lib:check_result(Server, ok, Client, ok),
    
    ssl_test_lib:close(Server),
    ssl_test_lib:close(Client).

client_echos_active_once(Data, Length, 
			 ClientOpts, ServerOpts, ClientNode, ServerNode,
			 Hostname) ->
    Server = ssl_test_lib:start_server([{node, ServerNode}, {port, 0}, 
					{from, self()}, 
					{mfa, 
					 {?MODULE, sender_once, 
					  [Data, Length]}},
					{options, [{active, once},
						   {mode, binary} | 
						   ServerOpts]}]),
    Port = ssl_test_lib:inet_port(Server),
    Client = ssl_test_lib:start_client([{node, ClientNode}, {port, Port}, 
					{host, Hostname},
					{from, self()}, 
					{mfa, 
					 {?MODULE, echoer_once, 
					  [Data, 
					   Length]}},
					{options,[{active, once},
						  {mode, binary}
						  | ClientOpts]}]),
    ssl_test_lib:check_result(Server, ok, Client, ok),
    
    ssl_test_lib:close(Server),
    ssl_test_lib:close(Client).

client_echos_active(Data, Length, ClientOpts, ServerOpts, ClientNode, 
		    ServerNode,
			 Hostname) ->
    Server = ssl_test_lib:start_server([{node, ServerNode}, {port, 0}, 
					{from, self()}, 
					{mfa, 
					 {?MODULE, sender_active, 
					  [Data, Length]}},
					{options, [{active, true}, 
						   {mode, binary}
						   | ServerOpts]}]),
    Port = ssl_test_lib:inet_port(Server),
    Client = ssl_test_lib:start_client([{node, ClientNode}, {port, Port}, 
					{host, Hostname},
					{from, self()}, 
					{mfa, 
					 {?MODULE, echoer_active, 
					       [Data, 
						Length]}},
					{options, [{active, true},
						   {mode, binary}
						   | ClientOpts]}]),
    ssl_test_lib:check_result(Server, ok, Client, ok),
    
    ssl_test_lib:close(Server),
    ssl_test_lib:close(Client).

send(_, _, _, 0,_) ->
    ok;
send(Socket, Data, Size, Repeate,F) ->
    NewData = lists:duplicate(Size div 10, Data),
    ssl:send(Socket, NewData),
    F(),
    send(Socket, Data, Size, Repeate - 1,F).
 
sender(Socket, Data, Size) ->
    ok = send(Socket, Data, Size, 100, fun() -> do_recv(Socket, Data, Size, <<>>, false) end),
    ct:log("Sender recv: ~p~n", [ssl:getopts(Socket, [active])]),
    ok.

sender_once(Socket, Data, Size) ->
    send(Socket, Data, Size, 100, 
	 fun() -> do_active_once(Socket, Data, Size, <<>>, false) end),
    ct:log("Sender active once: ~p~n",
		       [ssl:getopts(Socket, [active])]),
    ok.

sender_active(Socket, Data, Size) ->
    F = fun() -> do_active(Socket, Data, Size, <<>>, false) end,
    send(Socket, Data, Size, 100, F),
    ct:log("Sender active: ~p~n", [ssl:getopts(Socket, [active])]),
    ok.

echoer(Socket, Data, Size) ->
    ct:log("Echoer recv: ~p~n", [ssl:getopts(Socket, [active])]),
    echo(fun() -> do_recv(Socket, Data, Size, <<>>, true) end, 100).

echoer_once(Socket, Data, Size) ->
    ct:log("Echoer active once: ~p ~n",
		       [ssl:getopts(Socket, [active])]),
    echo(fun() -> do_active_once(Socket, Data, Size, <<>>, true) end, 100).

echoer_active(Socket, Data, Size) ->
    ct:log("Echoer active: ~p~n", [ssl:getopts(Socket, [active])]),
    echo(fun() -> do_active(Socket, Data, Size, <<>>, true) end, 100).

echo(_Fun, 0) -> ok;
echo(Fun, N) ->
    Fun(),
    echo(Fun, N-1).


do_recv(_Socket, _Data, 0, _Acc, true) ->
    ok;
do_recv(_Socket, Data, 0, Acc, false) ->
    Data = lists:sublist(binary_to_list(Acc), 10);

do_recv(Socket, Data, Size, Acc, Echo) ->
    {ok, NewData} = ssl:recv(Socket, 0),
    NewSize = size(NewData), 
    case Echo of
	true ->
	    ssl:send(Socket, NewData),
	    NewSize = size(NewData), 
	    do_recv(Socket, Data, Size - NewSize, [], Echo);
	false ->
	    case size(Acc) < 10 of
		true ->
		    do_recv(Socket, Data, Size - NewSize, 
			    <<Acc/binary, NewData/binary>>, Echo);
		false ->
		    do_recv(Socket, Data, Size - NewSize, Acc, Echo) 
	    end
    end.

do_active_once(_Socket, _Data, 0, _Acc, true) ->
    ok;
do_active_once(_Socket, Data, 0, Acc, false) ->
    Data = lists:sublist(binary_to_list(Acc), 10);

do_active_once(Socket, Data, Size, Acc, Echo) ->    
    receive 
	{ssl, Socket, NewData} ->
	    NewSize = size(NewData), 
	    case Echo of
		true ->
		    ssl:send(Socket, NewData),
		    ssl:setopts(Socket, [{active, once}]),
		    do_active_once(Socket, Data, Size - NewSize, [], Echo);
		false ->
		    case size(Acc) < 10 of
			true ->
			    ssl:setopts(Socket, [{active, once}]),
			    do_active_once(Socket, Data, Size - NewSize, 
					   <<Acc/binary, NewData/binary>>, 
					   Echo);
			false ->
			    ssl:setopts(Socket, [{active, once}]),
			    do_active_once(Socket, Data, 
					   Size - NewSize, Acc, Echo) 
		    end 
	    end
    end.
    
do_active(_Socket, _Data, 0, _Acc, true) ->
    ok;
do_active(_Socket, Data, 0, Acc, false) ->
    Data = lists:sublist(binary_to_list(Acc), 10);

do_active(Socket, Data, Size, Acc, Echo) ->    
    receive 
	{ssl, Socket, NewData} ->
	    NewSize = size(NewData), 
	    case Echo of
		true ->
		    ssl:send(Socket, NewData),
		    do_active(Socket, Data, Size - NewSize, [], Echo);
		false ->
		    case size(Acc) < 10 of
			true ->
			    do_active(Socket, Data, Size - NewSize, 
					   <<Acc/binary, NewData/binary>>, 
				      Echo);
			false ->
			    do_active(Socket, Data, 
				      Size - NewSize, Acc, Echo) 
		    end 
	    end
    end.
