initial commit of Erlang SCCP implementation
This code is my humble attempt to implement the most important
parts of the Q.71x specifcations in Erlang. The process tree
is trying to model the SCCP reference model as closely as psosible.
The SCRC and SCOC entities are implemented as OTP gen_fsm behavior.
SCLC is not implemented as separate state machine to reduce the number
of processes and message passing between them
SCMC is not implemented at all.
Each MTP (or other transport link) has one SCRC instance and as many
SCOC instances as there are connection-oriented SCCP sessions on this link.
There is no support for Global Title Translation (GTT) as of now.
diff --git a/src/sccp_user.erl b/src/sccp_user.erl
new file mode 100644
index 0000000..9523b92
--- /dev/null
+++ b/src/sccp_user.erl
@@ -0,0 +1,79 @@
+
+% (C) 2010 by Harald Welte <laforge@gnumonks.org>
+%
+% All Rights Reserved
+%
+% This program is free software; you can redistribute it and/or modify
+% it under the terms of the GNU Affero General Public License as
+% published by the Free Software Foundation; either version 3 of the
+% License, or (at your option) any later version.
+%
+% This program is distributed in the hope that it will be useful,
+% but WITHOUT ANY WARRANTY; without even the implied warranty of
+% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+% GNU General Public License for more details.
+%
+% You should have received a copy of the GNU Affero General Public License
+% along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+-module(sccp_user).
+-author('Harald Welte <laforge@gnumonks.org>').
+-export([init/3]).
+
+-include("sccp.hrl").
+
+-define(IPA_STREAM_ID_SCCP, 253).
+
+-record(loop_data, {
+ ipa_stream_id
+ }).
+
+init(TcpServerPort, IpaStreamId, Opts) ->
+ ipa_proto:init(),
+ % Create listening IPA socket
+ ipa_proto:start_listen(TcpServerPort, 1, Opts),
+ loop(#loop_data{ipa_stream_id = IpaStreamId}).
+
+% callback function to be called by IPA socket handler if it receives some data
+sccp_ipa_adapter_cb(S, IpaStreamID, DataBin, [ScrcPid]) ->
+ io:format("sccp_ipa_adapter_cb (Socket ~p, Stream ~p), passing data to SCRP~n", [S, IpaStreamID]),
+ % hand any incoming IPA message off into the SCCP stacks SCRC
+ gen_fsm:send_event(ScrcPid, sccp_scoc:make_prim('MTP', 'TRANSFER', indication, DataBin)).
+
+% callback function to be called by SCCP if it wants to transmit some data
+sccp_to_ipa_cb(#primitive{subsystem = 'MTP', gen_name = 'TRANSFER',
+ spec_name = request, parameters = DataBin}, [IpaPid, S, IpaStreamID]) ->
+ %ipa_proto:send(S, IpaStreamID, DataBin).
+ io:format("sccp_to_ipa_cb: Sending to ~p ~p/~p: ~p~n", [IpaPid, S,IpaStreamID, DataBin]),
+ IpaPid ! {ipa_send, S, IpaStreamID, DataBin}.
+
+loop(LoopData) ->
+ receive
+ {ipa_tcp_accept, S} ->
+ io:format("sccp_ipa_adapter: ipa_tcp_accept from ~p~n", [inet:peername(S)]),
+ % hand over the socket into the IPA stack
+ {ok, IpaPid} = ipa_proto:register_socket(S),
+ % Start the SCRC FSM for this virtual MTP link
+ ScrcMtpCb = {callback_fn, fun sccp_to_ipa_cb/2, [IpaPid, S, ?IPA_STREAM_ID_SCCP]},
+ {ok, ScrcPid} = sccp_scrc:start_link([{mtp_tx_action, ScrcMtpCb}]),
+ % Register an IPA stream for SCCP
+ ipa_proto:register_stream(S, ?IPA_STREAM_ID_SCCP,
+ {callback_fn, fun sccp_ipa_adapter_cb/4, [ScrcPid]}),
+ ipa_proto:unblock(S),
+ loop(LoopData);
+ % this code should later be moved into the actual MSC
+ {sccp, Prim} ->
+ io:format("sccp_user has received primitive ~p~n", [Prim]),
+ handle_sccp_prim(Prim),
+ loop(LoopData)
+ end.
+
+
+handle_sccp_prim(#primitive{subsystem = 'N', gen_name = 'CONNECT',
+ spec_name = indication, parameters = Params}) ->
+ %RespPrim = Prim#primitive{spec_name = response},
+ RespPrim = sccp_scoc:make_prim('N', 'CONNECT', response, []),
+ ScocPid = proplists:get_value(scoc_pid, Params),
+ gen_fsm:send_event(ScocPid, RespPrim);
+handle_sccp_prim(#primitive{}) ->
+ ok.