The R13B03 release.OTP_R13B03

1 files changed, 692 insertions, 0 deletions

diff --git a/lib/megaco/src/tcp/megaco_tcp.erl b/lib/megaco/src/tcp/megaco_tcp.erl
new file mode 100644
index 0000000000..45fd35eabc
--- /dev/null
+++ b/lib/megaco/src/tcp/megaco_tcp.erl
@@ -0,0 +1,692 @@
+%%
+%% %CopyrightBegin%
+%% 
+%% Copyright Ericsson AB 1999-2009. All Rights Reserved.
+%% 
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%% 
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%% 
+%% %CopyrightEnd%
+%%
+
+%%
+%%-----------------------------------------------------------------
+%%
+%% Purpose: 
+%%      Interface the TPKT (TCP/IP) transport module for Megaco/H.248
+%%
+%%-----------------------------------------------------------------
+-module(megaco_tcp).
+
+-behaviour(gen_server).
+
+
+%%-----------------------------------------------------------------
+%% Include files
+%%-----------------------------------------------------------------
+-include_lib("megaco/include/megaco.hrl").
+-include_lib("megaco/src/tcp/megaco_tcp.hrl"). 
+-include_lib("megaco/src/app/megaco_internal.hrl"). 
+
+
+-define(d1(F, A), ?d("~p " ++ F, [self()|A])).
+-define(d2(F),    ?d1(F, [])).
+
+
+%%-----------------------------------------------------------------
+%% External exports
+%%-----------------------------------------------------------------
+-export([
+	 start_transport/0, %% Start TPKT transport service
+	 stop_transport/1,  %% Stop TPKT transport service
+	 listen/2,          %% Starts a new listener socket
+	 connect/2,         %% Used on client side to connect server
+	 socket/1,          %% Returns the inet socket
+	 send_message/2,    %% Used to send data on connection
+	 block/1,           %% Used to block the socket for incomming
+	                    %% messages
+	 unblock/1,         %% Used to unblock the node
+	 close/1,           %% Used on both sides to close connection
+
+	 upgrade_receive_handle/2
+	]).
+
+%% Statistics exports
+-export([
+	 get_stats/0, get_stats/1, get_stats/2,
+	 reset_stats/0, reset_stats/1
+	]).
+
+
+%%-----------------------------------------------------------------
+%% Internal exports
+%%-----------------------------------------------------------------
+-export([
+	 start_link/1,       %% Start TCP/IP net server
+	 init/1,             %%
+	 terminate/2, 
+	 handle_call/3, 
+	 handle_cast/2, 
+	 handle_info/2, 
+	 code_change/3,
+	 start_connection/2
+	]).
+
+
+%%-----------------------------------------------------------------
+%% Server state record
+%%-----------------------------------------------------------------
+-record(state, {supervisor_pid, linkdb}).
+
+
+%%-----------------------------------------------------------------
+%% External interface functions
+%%-----------------------------------------------------------------
+
+%%-----------------------------------------------------------------
+%% Func: get_stats/0, get_stats/1, get_stats/2
+%% Description: Retreive statistics (counters) for TCP
+%%-----------------------------------------------------------------
+get_stats() ->
+    megaco_stats:get_stats(megaco_tcp_stats).
+
+get_stats(Socket) ->
+    megaco_stats:get_stats(megaco_tcp_stats, Socket).
+
+get_stats(Socket, Counter) ->
+    megaco_stats:get_stats(megaco_tcp_stats, Socket, Counter).
+
+
+%%-----------------------------------------------------------------
+%% Func: reset_stats/0, reaet_stats/1
+%% Description: Reset statistics (counters) for TCP
+%%-----------------------------------------------------------------
+reset_stats() ->
+    megaco_stats:reset_stats(megaco_tcp_stats).
+
+reset_stats(Socket) ->
+    megaco_stats:reset_stats(megaco_tcp_stats, Socket).
+
+
+%%-----------------------------------------------------------------
+%% Func: start_transport/0
+%% Description: Starts the TPKT transport service
+%%-----------------------------------------------------------------
+start_transport() ->
+    ?d2("start_transport -> entry"),
+    (catch megaco_stats:init(megaco_tcp_stats)),
+    megaco_tcp_sup:start_link().
+
+
+%%-----------------------------------------------------------------
+%% Func: stop_transport/1, 2
+%% Description: Stop the TPKT transport service
+%%-----------------------------------------------------------------
+stop_transport(Pid) ->
+    (catch unlink(Pid)), 
+    stop_transport(Pid, shutdown).
+
+stop_transport(Pid, Reason) ->
+    ?d1("stop_transport -> entry with"
+	"~n   Pid:    ~p"
+	"~n   Reason: ~p", [Pid, Reason]),
+    exit(Pid, Reason).
+
+
+%%-----------------------------------------------------------------
+%% Func: listen/2
+%% Description: Starts new TPKT listener sockets
+%%-----------------------------------------------------------------
+listen(SupPid, Parameters) ->
+    ?d1("listen -> entry with"
+	"~n   SupPid:     ~p"
+	"~n   Parameters: ~p", [SupPid, Parameters]),
+    ProcList = supervisor:which_children(SupPid),
+    case lists:keysearch(megaco_tcp, 1, ProcList) of
+	{value, {_Name, Pid, _Type, _Modules}} ->
+	    ?d1("listen -> found listener: "
+		"~n   Pid: ~p", [Pid]),
+	    call(Pid, {add_listener, Parameters});
+	false ->
+	    {error, no_tcp_server}
+    end.	    
+
+
+%%-----------------------------------------------------------------
+%% Func: connect
+%% Description: Function is used when opening an TCP socket 
+%%              at the MG side when trying to connect an MGC
+%%-----------------------------------------------------------------
+connect(SupPid, Parameters) ->
+    ?d1("connect -> entry with"
+	"~n   SupPid:     ~p"
+	"~n   Parameters: ~p", [SupPid, Parameters]),
+    Mand = [host, port, receive_handle],
+    case parse_options(Parameters, #megaco_tcp{}, Mand) of
+	{ok, Rec} ->
+
+	    ?d1("connect -> options parsed: "
+		"~n   Rec: ~p", [Rec]),
+
+	    #megaco_tcp{host    = Host,
+			port    = Port,
+			options = Options} = Rec,
+	    
+	    IpOpt = [binary, {packet, tpkt}, {active, once} | Options], 
+
+            %%------------------------------------------------------
+            %% Connect the other side
+	    case (catch gen_tcp:connect(Host, Port, IpOpt)) of
+		{ok, Socket} ->
+		    ?d1("connect -> connected: "
+			"~n   Socket: ~p", [Socket]),
+                    %%----------------------------------------------
+                    %% Socket up start a new control process
+		    Rec2 = Rec#megaco_tcp{socket = Socket}, 
+		    case start_connection(SupPid, Rec2) of
+			{ok, Pid} ->
+			    ?d1("connect -> connection started: "
+				"~n   Pid: ~p", [Pid]),
+			    gen_tcp:controlling_process(Socket, Pid),
+			    ?d2("connect -> control transferred"),
+			    {ok, Socket, Pid};
+			{error, Reason} ->
+			    ?d1("connect -> failed starting connection: "
+				"~n   Reason: ~p", [Reason]),
+			    {error, Reason}
+		    end;
+
+		{error, Reason} ->
+		    ?d1("connect -> failed connecting: "
+			"~n   Reason: ~p", [Reason]),
+		    Error = {error, {gen_tcp_connect, Reason}},
+		    ?tcp_debug(Rec, "tcp connect failed", [Error]),
+		    Error;
+
+		{'EXIT', _Reason} = Exit ->
+		    ?d1("connect -> connect exited: "
+			"~n   Exit: ~p", [Exit]),
+		    Error = {error, {gen_tcp_connect, Exit}},
+		    ?tcp_debug(Rec, "tcp connect failed", [Error]),
+		    Error
+
+	    end;
+
+	{error, _Reason} = Error ->
+	    ?d1("connect -> failed parsing options: "
+		"~n   Error: ~p", [Error]),
+	    ?tcp_debug(#megaco_tcp{}, "tcp connect failed",
+		       [Error, {options, Parameters}]),
+	    Error
+    end.
+
+
+%%-----------------------------------------------------------------
+%% Func: send_message
+%% Description: Function is used for sending data on the TCP socket
+%%-----------------------------------------------------------------
+send_message(Socket, Data) ->
+    ?d1("send_message -> entry with"
+	"~n   Socket:     ~p"
+	"~n   size(Data): ~p", [Socket, sz(Data)]),
+    {Size, NewData} = add_tpkt_header(Data),
+    Res = gen_tcp:send(Socket, NewData),
+    case Res of
+	ok ->
+	    incNumOutMessages(Socket),
+	    incNumOutOctets(Socket, Size);
+	_ ->
+	    ok
+    end,
+    Res.
+	    
+-ifdef(megaco_debug).
+sz(Bin) when is_binary(Bin) ->
+    size(Bin);
+sz(List) when is_list(List) ->
+    length(List).
+-endif.
+
+
+%%-----------------------------------------------------------------
+%% Func: block
+%% Description: Function is used for blocking incomming messages
+%%              on the TCP socket
+%%-----------------------------------------------------------------
+block(Socket) ->
+    ?tcp_debug({socket, Socket}, "tcp block", []),
+    inet:setopts(Socket, [{active, false}]).
+
+
+%%-----------------------------------------------------------------
+%% Func: unblock
+%% Description: Function is used for blocking incomming messages
+%%              on the TCP socket
+%%-----------------------------------------------------------------
+unblock(Socket) ->
+    ?tcp_debug({socket, Socket}, "tcp unblock", []),
+    inet:setopts(Socket, [{active, once}]).
+
+
+%%-----------------------------------------------------------------
+%% Func: close
+%% Description: Function is used for closing the TCP socket
+%%-----------------------------------------------------------------
+close(Socket) ->
+    ?tcp_debug({socket, Socket}, "tcp close", []),
+    gen_tcp:close(Socket).
+
+
+%%-----------------------------------------------------------------
+%% Func: socket
+%% Description: Returns the inet socket
+%%-----------------------------------------------------------------
+socket(Socket) ->
+    Socket.
+
+upgrade_receive_handle(Pid, NewHandle) 
+  when is_pid(Pid) andalso is_record(NewHandle, megaco_receive_handle) ->
+    megaco_tcp_connection:upgrade_receive_handle(Pid, NewHandle).
+
+
+%%-----------------------------------------------------------------
+%% Internal Interface functions
+%%-----------------------------------------------------------------
+%%-----------------------------------------------------------------
+%% Func: start_link/1
+%% Description: Starts the net server
+%%-----------------------------------------------------------------
+start_link(Args) ->
+    gen_server:start_link(?MODULE, Args, []).
+
+
+%%-----------------------------------------------------------------
+%% Func: start_connection
+%% Description: Function is used for starting up a connection
+%%              process
+%%-----------------------------------------------------------------
+start_connection(SupPid, #megaco_tcp{socket = Socket} = TcpRec) ->
+    ?d1("start_connection -> entry with"
+	"~n   SupPid: ~p" 
+	"~n   Socket: ~p", [SupPid, Socket]),
+    
+    case connection_sup(SupPid) of
+	{ok, ConnSupPid} ->
+	    ?d1("start_connection -> found connection supervisor: "
+		"~n   ConnSupPid: ~p", [ConnSupPid]),
+	    ?tcp_debug(TcpRec, "tcp connect", []),
+	    case create_connection(ConnSupPid, TcpRec) of
+		{ok, Pid} ->
+		    ?d1("start_connection -> started: "
+			"~n   Pid: ~p", [Pid]),
+		    ?tcp_debug(TcpRec, "connect handler started", [Pid]),
+		    create_snmp_counters(Socket),
+		    {ok, Pid};
+		{error, Reason} ->
+		    ?d1("start_connection -> failed starting: "
+			"~n   Reason: ~p", [Reason]),
+		    Error = {error, {controlling_process_not_started, Reason}},
+		    ?tcp_debug(TcpRec, "tcp connect failed", [Error]),
+		    Error
+	    end;
+	{error, _Reason} ->
+	    ?d2("start_connection -> could not find connection supervisor"),
+	    Error = {error, no_connection_supervisor},
+	    ?tcp_debug(TcpRec, "tcp connect failed", [Error]),
+	    Error
+    end.
+
+connection_sup(Pid) ->
+    megaco_tcp_sup:which_connection_sup(Pid).
+
+create_connection(Pid, Rec) ->
+    megaco_tcp_connection_sup:start_child(Pid, Rec).
+
+create_snmp_counters(Socket) ->
+    Counters = [medGwyGatewayNumInMessages, 
+                medGwyGatewayNumInOctets, 
+                medGwyGatewayNumOutMessages, 
+                medGwyGatewayNumOutOctets, 
+                medGwyGatewayNumErrors],
+    create_snmp_counters(Socket, Counters).
+
+create_snmp_counters(_Socket, []) ->
+    ok;
+create_snmp_counters(Socket, [Counter|Counters]) ->
+    Key = {Socket, Counter},
+    ets:insert(megaco_tcp_stats, {Key, 0}),
+    create_snmp_counters(Socket, Counters).
+
+
+%%-----------------------------------------------------------------
+%% Server functions
+%%-----------------------------------------------------------------
+%%-----------------------------------------------------------------
+%% Func: init/1
+%% Description: Init funcion for the supervisor
+%%-----------------------------------------------------------------
+init({SupPid, _}) ->
+    process_flag(trap_exit, true),
+    {ok, #state{supervisor_pid = SupPid}}.
+
+%%-----------------------------------------------------------------
+%% Func: terminate/1
+%% Description: Termination function for the generic server
+%%-----------------------------------------------------------------
+terminate(_Reason, _State) ->
+    ok.
+
+
+%%-----------------------------------------------------------------
+%% Internal Functions
+%%-----------------------------------------------------------------
+
+%%-----------------------------------------------------------------
+%% Func: start_tcp_listener/2
+%% Description: Function which parses the list of transport layers
+%%              to start 
+%%-----------------------------------------------------------------
+start_tcp_listener(P, State) ->
+    ?d1("start_tcp_listener -> entry with"
+	"~n   P: ~p", [P]),
+    case setup(State#state.supervisor_pid, P) of
+	{ok, Pid, Data} ->
+	    ?d1("start_tcp_listener -> setup ok"
+		"~n   Pid:  ~p"
+		"~n   Data: ~p", [Pid, Data]),
+	    link(Pid),
+	    {reply, ok, 
+	     State#state{linkdb=[{Pid, Data} | State#state.linkdb]}};
+	{error, Reason} ->
+	    ?d1("start_tcp_listener -> setup failed"
+		"~n   Reason: ~p", [Reason]),
+	    {reply, {error, {could_not_start_listener, Reason}}, State}
+    end.
+
+
+%%-----------------------------------------------------------------
+%% Func: handle_call/3
+%% Description: Handling call messages (really just garbage)
+%%-----------------------------------------------------------------
+handle_call({add_listener, Parameters}, _From, State) ->
+    ?d1("handle_call(add_listener) -> entry with"
+	"~n   Parameters: ~p", [Parameters]),
+    start_tcp_listener(Parameters, State);
+handle_call(Req, From, State) ->
+    warning_msg("received unexpected request from ~p: "
+		"~n~w", [From, Req]),
+    {noreply, State}.
+
+
+%%------------------------------------------------------------
+%% Func: handle_cast/2
+%% Description: Handling cast messages (really just garbage)
+%%------------------------------------------------------------
+handle_cast(Msg, State) ->
+    warning_msg("received unexpected message: "
+		"~n~w", [Msg]),
+    {noreply,  State}.
+
+
+%%-----------------------------------------------------------------
+%% Func: handle_info/2
+%% Description: Handling non call/cast messages, eg exit messages
+%%-----------------------------------------------------------------
+handle_info({'EXIT', Pid, Reason}, State) when is_pid(Pid) ->
+    %% Accept process died
+    NewState = resetup(Pid, Reason, State),
+    {noreply, NewState};
+handle_info(Info, State) ->
+    warning_msg("received unexpected info: "
+		"~n~w", [Info]),
+    {noreply,  State}.
+
+
+%%-----------------------------------------------------------------
+%% Func: code_change/3
+%% Descrition: Handles code change messages during upgrade.
+%%-----------------------------------------------------------------
+code_change(_Vsn, State, _Extra) ->
+    {ok, State}.
+
+
+%%-----------------------------------------------------------------
+%% Internal functions
+%%-----------------------------------------------------------------
+%%-----------------------------------------------------------------
+%% Func: setup/2
+%% Description: Function is used when setting up an TCP listen 
+%%              socket in the MGC
+%%-----------------------------------------------------------------
+setup(SupPid, Options) ->
+    ?d1("setup -> entry with"
+	"~n   SupPid:  ~p"
+	"~n   Options: ~p", [SupPid, Options]),
+    Mand = [port, receive_handle],
+    case parse_options(Options, #megaco_tcp{}, Mand) of
+	{ok, TcpRec} ->
+    
+	    ?d1("setup -> options parsed"
+		"~n   TcpRec: ~p", [TcpRec]),
+
+            %%------------------------------------------------------
+            %% Setup the listen socket
+	    IpOpts = [binary, {packet, tpkt}, {active, once},
+		      {reuseaddr, true} | TcpRec#megaco_tcp.options],
+	    case catch gen_tcp:listen(TcpRec#megaco_tcp.port, IpOpts) of
+		{ok, Listen} ->
+
+		    ?d1("setup -> listen ok"
+			"~n   Listen: ~p", [Listen]),
+
+	            %%-----------------------------------------------
+	            %% Startup the accept process that will wait for 
+	            %% connect attempts
+		    case start_accept(SupPid, TcpRec, Listen) of
+			{ok, Pid} ->
+
+			    ?d1("setup -> accept process started"
+				"~n   Pid: ~p", [Pid]),
+
+			    ?tcp_debug(TcpRec, "tcp listen setup", []),
+			    {ok, Pid, {TcpRec, Listen}};
+			{error, _Reason} = Error ->
+			    ?d1("setup -> failed starting accept process"
+				"~n   Error: ~p", [Error]),
+			    ?tcp_debug(TcpRec, "tcp listen setup failed", 
+				       [Error]),
+			    Error
+		    end;
+		{error, Reason} ->
+		    ?d1("setup -> listen failed"
+			"~n   Reason: ~p", [Reason]),
+		    Error = {error, {gen_tcp_listen, Reason}},
+		    ?tcp_debug(TcpRec, "tcp listen setup failed", [Error]),
+		    Error;
+		{'EXIT', _Reason} = Exit ->
+		    ?d1("setup -> listen exited"
+			"~n   Exit: ~p", [Exit]),
+		    Error = {error, {gen_tcp_listen, Exit}},
+		    ?tcp_debug(TcpRec, "tcp listen setup failed", [Error]),
+		    Error
+	    end;
+	{error, _Reason} = Error ->
+	    ?d1("setup -> failed parsing options"
+		"~n   Error: ~p", [Error]),
+	    ?tcp_debug(#megaco_tcp{}, "tcp listen setup failed",
+		       [Error, {options, Options}]),
+	    Error
+    end.
+    
+
+%%-----------------------------------------------------------------
+%% Func: resetup
+%% Description: Function is used when restarting the accept process
+%%              if it died for some reason.
+%%-----------------------------------------------------------------
+
+resetup(Pid, Reason, State) ->
+    ?d1("resetup -> entry with"
+	"~n   Pid:    ~p"
+	"~n   Reason: ~p", [Pid, Reason]),
+    case lists:keysearch(Pid, 1, State#state.linkdb) of
+	{value, {Pid, {TcpRec, Listener}}} ->
+	    ?d1("resetup -> found accept process: "
+		"~n   TcpRec:   ~p"
+		"~n   Listener: ~p", [TcpRec, Listener]),
+	    ?tcp_debug(TcpRec, "tcp listen resetup", [{error, Reason}]),
+	    unlink(Pid),
+	    warning_msg("received unexpected 'EXIT' signal "
+			"from accept process ~p: "
+			"~n~w", [Pid, Reason]),
+	    case start_accept(State#state.supervisor_pid, TcpRec, Listener) of
+		{ok, NewPid} ->
+		    ?d1("resetup -> start new accept process ok: "
+			"~n   NewPid: ~p", [NewPid]),
+		    link(NewPid),
+		    NewList = lists:keyreplace(Pid, 1, State#state.linkdb,
+					       {NewPid, {TcpRec, Listener}}),
+		    State#state{linkdb = NewList};
+		{error, Reason} ->
+		    ?d1("resetup -> failed starting new accept process: "
+			"~n   :Reason ~p", [Reason]),
+		    ?tcp_debug(TcpRec, 
+			       "tcp listen resetup failed", [{error, Reason}]),
+		    State
+	    end;
+	false ->
+	    warning_msg("received unexpected 'EXIT' signal from ~p: "
+			"~n~w", [Pid, Reason]),
+	    State
+    end.
+
+
+%%-----------------------------------------------------------------
+%% Func: start_accept
+%% Description: Function is used for starting up an TCP accept
+%%              process
+%%-----------------------------------------------------------------
+start_accept(SupPid, TcpRec, Listen) ->
+    ?d1("start_accept -> entry with"
+	"~n   SupPid: ~p"
+	"~n   TcpRec: ~p"
+	"~n   Reason: ~p", [SupPid, TcpRec, Listen]),
+    case accept_sup(SupPid) of
+	{ok, AcceptSupPid} ->
+	    ?d1("start_accept -> found accept supervisor"
+		"~n   AcceptSupPid: ~p", [AcceptSupPid]),
+	    case create_acceptor(AcceptSupPid, TcpRec, SupPid, Listen) of
+		{ok, Pid} ->
+		    ?d1("start_accept -> accept process started"
+			"~n   Pid: ~p", [Pid]),
+		    {ok, Pid};
+		{error, Reason} ->
+		    ?d1("start_accept -> failed starting accept process: "
+			"~n   Reason: ~p", [Reason]),
+		    {error, {accept_not_started, Reason}}
+	    end;
+	{error, Reason} ->
+	    ?d1("start_accept -> could not find acceept supervisor: "
+		"~n   Reason: ~p", [Reason]),
+	    {error, {no_tcp_accept_sup, Reason}}
+    end.
+
+accept_sup(Pid) ->
+    megaco_tcp_sup:which_accept_sup(Pid).
+
+create_acceptor(Pid, Rec, TopSup, Listen) ->
+    megaco_tcp_accept_sup:start_child(Pid, Rec, TopSup, Listen).
+
+
+%%-----------------------------------------------------------------
+%% Func: add_tpkt_header
+%% Description: Function is used to add the TPKT header
+%%-----------------------------------------------------------------
+add_tpkt_header(Data) when is_binary(Data) ->
+    L = size(Data) + 4,
+    {L, [3, 0, ((L) bsr 8) band 16#ff, (L) band 16#ff ,Data]};
+add_tpkt_header(IOList) when is_list(IOList) ->
+    Binary = list_to_binary(IOList),
+    L = size(Binary) + 4,
+    {L, [3, 0, ((L) bsr 8) band 16#ff, (L) band 16#ff , Binary]}.
+
+%%-----------------------------------------------------------------
+%% Func: parse_options
+%% Description: Function that parses the options sent to the TCP 
+%%              module.
+%%-----------------------------------------------------------------
+parse_options([{Tag, Val} | T], TcpRec, Mand) ->
+    ?d1("parse_options -> entry with"
+	"~n   Tag: ~p"
+	"~n   Val: ~p", [Tag, Val]),
+    Mand2 = Mand -- [Tag],
+    case Tag of
+	port ->
+	    parse_options(T, TcpRec#megaco_tcp{port = Val}, Mand2);
+	host ->
+	    parse_options(T, TcpRec#megaco_tcp{host = Val}, Mand2);
+	tcp_options when is_list(Val) ->
+	    parse_options(T, TcpRec#megaco_tcp{options = Val}, Mand2);
+	receive_handle ->
+	    parse_options(T, TcpRec#megaco_tcp{receive_handle = Val}, Mand2);
+	module when is_atom(Val) ->
+	    parse_options(T, TcpRec#megaco_tcp{module = Val}, Mand2);
+	serialize when (Val =:= true) orelse (Val =:= false) ->
+	    parse_options(T, TcpRec#megaco_tcp{serialize = Val}, Mand2);
+        Bad ->
+	    ?d1("parse_options -> bad option: "
+		"~n   Tag: ~p", [Tag]),
+	    {error, {bad_option, Bad}}
+    end;
+parse_options([], TcpRec, []) ->
+    ?d2("parse_options -> done"),
+    {ok, TcpRec};
+parse_options([], _TcpRec, Mand) ->
+    ?d1("parse_options -> entry with"
+	"~n   Mand: ~p", [Mand]),
+    {error, {missing_options, Mand}};
+parse_options(BadList, _TcpRec, _Mand) ->
+    ?d1("parse_options -> entry with"
+	"~n   BadList: ~p", [BadList]),
+    {error, {bad_option_list, BadList}}.
+
+
+%%-----------------------------------------------------------------
+%% Func: incNumOutMessages/1, incNumOutOctets/2, incNumErrors/1
+%% Description: SNMP counter increment functions
+%%              
+%%-----------------------------------------------------------------
+incNumOutMessages(Socket) ->
+    incCounter({Socket, medGwyGatewayNumOutMessages}, 1).
+
+incNumOutOctets(Socket, NumOctets) ->
+    incCounter({Socket, medGwyGatewayNumOutOctets}, NumOctets).
+
+incCounter(Key, Inc) ->
+    ets:update_counter(megaco_tcp_stats, Key, Inc).
+
+% incNumErrors(Socket) ->
+%     ets:update_counter(megaco_tcp_stats, 
+% 		       {Socket, medGwyGatewayNumErrors}, 1).
+
+
+%%-----------------------------------------------------------------
+
+
+warning_msg(F, A) ->
+    ?megaco_warning("TCP server: " ++ F, A).
+  
+%% error_msg(F, A) ->
+%%     ?megaco_error("TCP server: " ++ F, A).
+
+
+call(Pid, Req) ->
+    gen_server:call(Pid, Req, infinity).