119 lines
4.5 KiB
Erlang
119 lines
4.5 KiB
Erlang
% VFUK-ONW specific mgw_nat actor callback functions
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% (C) 2011 by Harald Welte <laforge@gnumonks.org>
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% (C) 2011 OnWaves
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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(mgw_nat_act_vfuk_onw).
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-author("Harald Welte <laforge@gnumonks.org>").
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-export([rewrite_actor/5, reload_config/0]).
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-export([camelph_twalk_cb/3]).
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-include_lib("osmo_map/include/map.hrl").
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-include_lib("osmo_ss7/include/sccp.hrl").
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% Rewrite at SCTP (root) level:
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rewrite_actor(sctp, From, Path, 2, DataBin) ->
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try mgw_nat:mangle_rx_data(From, Path, DataBin, fun rewrite_actor/5) of
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Val ->
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Val
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catch error:Error ->
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% some parser error, simply forward msg unmodified
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error_logger:error_report([{error, Error},
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{stacktrace, erlang:get_stacktrace()},
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{from, From}, {path, Path},
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{data_bin, DataBin}]),
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DataBin
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end;
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% Rewrite at SCCP level: call into mangle_tt_sri_sm
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rewrite_actor(sccp, from_msc, Path, SccpType, SccpDec) ->
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mangle_tt_sri_sm:mangle_tt_sri_sm(from_msc, Path, SccpType, SccpDec);
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% Rewrite at MAP level: call into map_masq module
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rewrite_actor(map, From, Path, 0, MapDec) ->
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mangle_map_camel_phase(From, Path, MapDec);
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% Default action: no rewrite
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rewrite_actor(_Level, _From, _Path, _MsgType, Msg) ->
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Msg.
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mangle_map_camel_phase(from_stp, _Path, MapDec) ->
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MapDec;
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mangle_map_camel_phase(from_msc, Path, MapDec) ->
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% Resolve the Global Title of the SCCP Called Addr
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{value, #sccp_msg{parameters = SccpPars}} = lists:keysearch(sccp_msg, 1, Path),
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CalledAddr = proplists:get_value(called_party_addr, SccpPars),
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{ok, IntTbl} = application:get_env(mgw_nat, int_camel_ph_tbl),
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case osmo_ss7_gtt:global_title_match(IntTbl, CalledAddr) of
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false ->
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MapDec;
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PhaseL ->
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#global_title{phone_number = PhoneNum} = CalledAddr#sccp_addr.global_title,
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PhoneNumInt = osmo_util:digit_list2int(PhoneNum),
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io:format("Rewriting Camel Phase List to ~p, GT ~p~n", [PhaseL, PhoneNumInt]),
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osmo_util:tuple_walk(MapDec, fun camelph_twalk_cb/3, [PhaseL])
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end.
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% tuple tree walker callback function
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camelph_twalk_cb(['begin','MapSpecificPDUs_begin',basicROS,invoke,
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'MapSpecificPDUs_begin_components_SEQOF_basicROS_invoke',
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'UpdateLocationArg'], VC = #'VLR-Capability'{}, [PhaseL|_Args]) ->
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% Manipulate the VLR capabilities in UpdateLocationArg
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VC#'VLR-Capability'{supportedCamelPhases = PhaseL};
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camelph_twalk_cb(_Path, Msg, _Args) ->
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% Default case: simply return the unmodified tuple
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Msg.
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gen_int_camelph_tbl(L) ->
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gen_int_camelph_tbl(L, []).
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gen_int_camelph_tbl([], Out) ->
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Out;
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gen_int_camelph_tbl([{GttPart, PhasePart}|Tail], Out) ->
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GttMatch = osmo_ss7_gtt:'#new-gtt_match'(GttPart),
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% Fixme: use ordered insert!
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gen_int_camelph_tbl(Tail, Out ++ [{GttMatch, PhasePart}]).
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reload_config() ->
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{ok, CamelPatchTblIn} = application:get_env(mgw_nat, camel_phase_patch_table),
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io:format("VFUK-ONW actor: reloading config ~p~n", [CamelPatchTblIn]),
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try gen_int_camelph_tbl(CamelPatchTblIn) of
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TblOut ->
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application:set_env(mgw_nat, int_camel_ph_tbl, TblOut)
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catch error:Error ->
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error_logger:error_report([{error, Error},
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{stacktrace, erlang:get_stacktrace()}])
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end.
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