117 lines
4.0 KiB
Erlang
117 lines
4.0 KiB
Erlang
% MTP3 Message handling; message distribution (HMDT) according to Q.704
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% (C) 2011-2012 by Harald Welte <laforge@gnumonks.org>
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%
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% All Rights Reserved
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%
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% This program is free software; you can redistribute it and/or modify
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% it under the terms of the GNU Affero General Public License as
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% published by the Free Software Foundation; either version 3 of the
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% License, or (at your option) any later version.
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%
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% This program is distributed in the hope that it will be useful,
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% but WITHOUT ANY WARRANTY; without even the implied warranty of
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% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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% GNU General Public License for more details.
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%
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% You should have received a copy of the GNU Affero General Public License
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% along with this program. If not, see <http://www.gnu.org/licenses/>.
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%
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% Additional Permission under GNU AGPL version 3 section 7:
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%
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% If you modify this Program, or any covered work, by linking or
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% combining it with runtime libraries of Erlang/OTP as released by
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% Ericsson on http://www.erlang.org (or a modified version of these
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% libraries), containing parts covered by the terms of the Erlang Public
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% License (http://www.erlang.org/EPLICENSE), the licensors of this
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% Program grant you additional permission to convey the resulting work
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% without the need to license the runtime libraries of Erlang/OTP under
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% the GNU Affero General Public License. Corresponding Source for a
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% non-source form of such a combination shall include the source code
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% for the parts of the runtime libraries of Erlang/OTP used as well as
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% that of the covered work.
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-module(mtp3_hmdt).
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-author('Harald Welte <laforge@gnumonks.org>').
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-behaviour(gen_fsm).
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-include("mtp3.hrl").
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% gen_fsm exports
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-export([init/1, terminate/3, code_change/4, handle_event/3, handle_info/3]).
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% individual FSM states
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-export([idle/2, own_sp_restart/2]).
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-record(hmdt_state, {
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sltc_pid
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}).
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% gen_fsm callbacks
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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init([Sltc]) when is_pid(Sltc) ->
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HmdtState = #hmdt_state{sltc_pid = Sltc},
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{ok, idle, HmdtState}.
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terminate(Reason, State, _LoopDat) ->
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io:format("Terminating ~p in State ~p (Reason: ~p)~n",
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[?MODULE, State, Reason]),
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ok.
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code_change(_OldVsn, StateName, LoopDat, _Extra) ->
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{ok, StateName, LoopDat}.
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handle_event(Event, State, LoopDat) ->
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io:format("Unknown Event ~p in state ~p~n", [Event, State]),
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{next_state, State, LoopDat}.
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handle_info(Info, State, LoopDat) ->
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io:format("Unknown Info ~p in state ~p~n", [Info, State]),
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{next_state, State, LoopDat}.
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% See Figure 2 of Q.707
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% STATE: idle
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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idle(M=#mtp3_msg{service_ind=Sio}, LoopDat) ->
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handle_mtp3(Sio, M, LoopDat),
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{next_state, idle, LoopDat};
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idle(restart_begins, LoopDat) ->
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{next_state, own_sp_restart, LoopDat}.
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% STATE: own_sp_restart
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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own_sp_restart(M=#mtp3_msg{service_ind=Sio}, LoopDat) when
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Sio == ?MTP3_SERV_MGMT; Sio == ?MTP3_SERV_MTN ->
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handle_mtp3(Sio, M, LoopDat),
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{next_state, own_sp_restart, LoopDat};
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own_sp_restart(restart_ends, LoopDat) ->
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{next_state, idle, LoopDat}.
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% helper functions
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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handle_mtp3(?MTP3_SERV_MTN, Mtp3, LoopDat) ->
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io:format("SIO ~p HMDT -> SLTC~n", [?MTP3_SERV_MTN]),
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gen_fsm:send_event(LoopDat#hmdt_state.sltc_pid, Mtp3);
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handle_mtp3(?MTP3_SERV_MGMT, Mtp3, LoopDat) ->
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io:format("SIO ~p HMDT -> NULL~n", [?MTP3_SERV_MGMT]),
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% FIXME: distinguish between SRM, SLM and STM
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ok;
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handle_mtp3(Sio, Mtp3, LoopDat) ->
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io:format("SIO ~p HMDT -> ss7_links~n", [Sio]),
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% deliver to subsystem
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ss7_links:mtp3_rx(Mtp3),
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% FIXME: Send UPU! ?
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ok.
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