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% VFUK-ONW specific mgw_nat actor callback functions
% (C) 2011 by Harald Welte <laforge@gnumonks.org>
% (C) 2011 OnWaves
%
% 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(mgw_nat_act_vfuk_onw).
-author("Harald Welte <laforge@gnumonks.org>").
-export([rewrite_actor/5]).
-export([camelph_twalk_cb/3]).
-include_lib("osmo_map/include/map.hrl").
-include_lib("osmo_ss7/include/sccp.hrl").
% Rewrite at SCTP (root) level:
rewrite_actor(sctp, From, Path, 2, DataBin) ->
try mgw_nat:mangle_rx_data(From, Path, DataBin, fun rewrite_actor/5) of
Val ->
Val
catch error:Error ->
% some parser error, simply forward msg unmodified
io:format("MGW NAT mangling Error: ~p~n", [Error]),
DataBin
end;
% Rewrite at MAP level: call into map_masq module
rewrite_actor(map, From, Path, 0, MapDec) ->
mangle_map_camel_phase(From, Path, MapDec);
% Default action: no rewrite
rewrite_actor(_Level, _From, _Path, _MsgType, Msg) ->
Msg.
mangle_map_camel_phase(from_stp, Path, MapDec) ->
MapDec;
mangle_map_camel_phase(from_msc, Path, MapDec) ->
% Resolve the Global Title of the SCCP Called Addr
#sccp_msg{parameters = SccpPars} = lists:keyfind(sccp_msg, 1, Path),
CalledAddr = proplists:get_value(called_party_addr, SccpPars),
#global_title{phone_number = PhoneNum} = CalledAddr#sccp_addr.global_title,
PhoneNumInt = osmo_util:digit_list2int(PhoneNum),
{ok, CamelPatchTbl} = application:get_env(camel_phase_patch_table),
case lists:keyfind(PhoneNumInt, 1, CamelPatchTbl) of
false ->
MapDec;
{ _Num, PhaseL } ->
osmo_util:tuple_walk(MapDec, fun camelph_twalk_cb/3, [PhaseL])
end.
% tuple tree walker callback function
camelph_twalk_cb(['begin','MapSpecificPDUs_begin',basicROS,invoke,
'MapSpecificPDUs_begin_components_SEQOF_basicROS_invoke',
'UpdateLocationArg'], VC = #'VLR-Capability'{}, [PhaseL|_Args]) ->
% Manipulate the VLR capabilities in UpdateLocationArg
VC#'VLR-Capability'{supportedCamelPhases = PhaseL};
camelph_twalk_cb(_Path, Msg, _Args) ->
% Default case: simply return the unmodified tuple
Msg.
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