202 lines
8.0 KiB
Erlang
202 lines
8.0 KiB
Erlang
% FIXME
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% (C) 2012 by Harald Welte <laforge@gnumonks.org>
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% (C) 2012 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(mangle_tt_sri_sm).
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-author("Harald Welte <laforge@gnumonks.org>").
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-export([mangle_tt_sri_sm/4]).
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-export([gt_match_pfx/2, gt_match_pfx_list/2,
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isup_party_match_pfx/2, isup_party_match_pfx_list/2]).
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-export([get_tcap_components/1, get_tcap_operation/1, get_tcap_operations/1,
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check_for_tcap_op/3, check_for_invoke_sri_sm/1]).
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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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-include_lib("osmo_ss7/include/isup.hrl").
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% high-level function to determine if a Sccp / MAP message contains a Invoke SRI-SM
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check_for_invoke_sri_sm(MapDec) ->
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check_for_tcap_op(invoke, {local, 45}, MapDec).
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% check if there's a prefix match between a given GT and prefix
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gt_match_pfx(GT, MatchPfx) when is_record(GT, global_title),
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is_integer(MatchPfx) ->
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gt_match_pfx(GT, osmo_util:int2digit_list(MatchPfx));
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gt_match_pfx(GT, MatchPfx) when is_record(GT, global_title),
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is_list(MatchPfx) ->
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match_pfx(GT#global_title.phone_number, MatchPfx).
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% check if there's a prefix match between a given ISUP party_addr and prefix
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isup_party_match_pfx(Party, MatchPfx) when is_record(Party, party_number),
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is_integer(MatchPfx) ->
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isup_party_match_pfx(Party, osmo_util:int2digit_list(MatchPfx));
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isup_party_match_pfx(Party, MatchPfx) when is_record(Party, party_number) ->
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DigitsIn = Party#party_number.phone_number,
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match_pfx(DigitsIn, MatchPfx).
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match_pfx(DigitsIn, MatchPfx) when is_list(DigitsIn), is_list(MatchPfx) ->
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MatchPfxLen = length(MatchPfx),
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Pfx = lists:sublist(DigitsIn, 1, MatchPfxLen),
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case Pfx of
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MatchPfx ->
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true;
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_ ->
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false
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end.
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% check if there's a prefix match of Global Titles among a list of prefixes
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gt_match_pfx_list(GT, []) when is_record(GT, global_title) ->
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false;
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gt_match_pfx_list(GT, [MatchPfx|Tail]) when is_record(GT, global_title) ->
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case gt_match_pfx(GT, MatchPfx) of
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true ->
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true;
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_ ->
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gt_match_pfx_list(GT, Tail)
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end.
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% check if there's a prefix match of ISUP Party number among a list of prefixes
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isup_party_match_pfx_list(PN, []) when is_record(PN, party_number) ->
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false;
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isup_party_match_pfx_list(PN, [MatchPfx|Tail]) when is_record(PN, party_number) ->
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case isup_party_match_pfx(PN, MatchPfx) of
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true ->
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true;
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_ ->
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isup_party_match_pfx_list(PN, Tail)
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end.
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% get a list of components from the decoded TCAP+MAP nested record
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get_tcap_components({'begin', Beg}) ->
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get_tcap_components(Beg);
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get_tcap_components({'end', Beg}) ->
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get_tcap_components(Beg);
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get_tcap_components({'continue', Beg}) ->
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get_tcap_components(Beg);
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% map.erl
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get_tcap_components(#'MapSpecificPDUs_begin'{components=Comps}) ->
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Comps;
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get_tcap_components(#'MapSpecificPDUs_continue'{components=Comps}) ->
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Comps;
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get_tcap_components(#'MapSpecificPDUs_end'{components=Comps}) ->
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Comps;
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get_tcap_components(_) ->
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[].
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% get the MAP operation of a specific component
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get_tcap_operation({basicROS, Rec}) ->
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get_tcap_operation(Rec);
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get_tcap_operation({invoke, Rec}) ->
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get_tcap_operation(Rec);
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get_tcap_operation({returnResult, Rec}) ->
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get_tcap_operation(Rec);
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get_tcap_operation({returnResultNotLast, Rec}) ->
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get_tcap_operation(Rec);
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get_tcap_operation({returnError, _Rec}) ->
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{returnError, undefined};
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% map.erl
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get_tcap_operation(#'MapSpecificPDUs_begin_components_SEQOF_basicROS_invoke'{opcode=Op}) ->
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{invoke, Op};
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get_tcap_operation(#'MapSpecificPDUs_continue_components_SEQOF_basicROS_invoke'{opcode=Op}) ->
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{invoke, Op};
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get_tcap_operation(#'MapSpecificPDUs_end_components_SEQOF_basicROS_invoke'{opcode=Op}) ->
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{invoke, Op};
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get_tcap_operation(#'MapSpecificPDUs_begin_components_SEQOF_basicROS_returnResult'{result=Res}) ->
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{returnResult, Res#'MapSpecificPDUs_begin_components_SEQOF_basicROS_returnResult_result'.opcode};
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get_tcap_operation(#'MapSpecificPDUs_continue_components_SEQOF_basicROS_returnResult'{result=Res}) ->
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{returnResult, Res#'MapSpecificPDUs_continue_components_SEQOF_basicROS_returnResult_result'.opcode};
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get_tcap_operation(#'MapSpecificPDUs_end_components_SEQOF_basicROS_returnResult'{result=asn1_NOVALUE}) ->
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% FIXME: check for asn1_NOVALUE in other cases
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{returnResult, undefined};
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get_tcap_operation(#'MapSpecificPDUs_end_components_SEQOF_basicROS_returnResult'{result=Res}) ->
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{returnResult, Res#'MapSpecificPDUs_end_components_SEQOF_basicROS_returnResult_result'.opcode};
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get_tcap_operation(#'MapSpecificPDUs_begin_components_SEQOF_basicROS_returnError'{}) ->
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{returnError, undefined};
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get_tcap_operation(#'MapSpecificPDUs_continue_components_SEQOF_basicROS_returnError'{}) ->
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{returnError, undefined};
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get_tcap_operation(#'MapSpecificPDUs_end_components_SEQOF_basicROS_returnError'{}) ->
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{returnError, undefined};
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get_tcap_operation(#'MapSpecificPDUs_begin_components_SEQOF_returnResultNotLast'{result=Res}) ->
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{returnResult, Res#'MapSpecificPDUs_begin_components_SEQOF_returnResultNotLast_result'.opcode};
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get_tcap_operation(#'MapSpecificPDUs_continue_components_SEQOF_returnResultNotLast'{result=Res}) ->
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{returnResult, Res#'MapSpecificPDUs_continue_components_SEQOF_returnResultNotLast_result'.opcode};
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get_tcap_operation(#'MapSpecificPDUs_end_components_SEQOF_returnResultNotLast'{result=Res}) ->
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{returnResult, Res#'MapSpecificPDUs_end_components_SEQOF_returnResultNotLast_result'.opcode}.
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% get a list of the MAP operations inside the components of a MAP message
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get_tcap_operations(MapDec) ->
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Comps = get_tcap_components(MapDec),
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[get_tcap_operation(X) || X <- Comps].
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check_for_tcap_op(Comp, Op, SccpDec) when is_record(SccpDec, sccp_msg) ->
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UserData = proplists:get_value(user_data, SccpDec#sccp_msg.parameters),
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MapDec = map_codec:parse_tcap_msg(UserData),
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check_for_tcap_op(Comp, Op, MapDec);
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check_for_tcap_op(Comp, Op, MapDec) ->
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MapOps = get_tcap_operations(MapDec),
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% check for invoke of SRI-for-SM:
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lists:member({Comp, Op}, MapOps).
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mangle_tt_sri_sm(from_msc, _Path, ?SCCP_MSGT_UDT, SccpDec = #sccp_msg{parameters=Opts}) ->
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CalledParty = proplists:get_value(called_party_addr, Opts),
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CalledGT = CalledParty#sccp_addr.global_title,
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case application:get_env(mgw_nat, mangle_tt_sri_sm_pfx) of
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{ok, PrefixList} ->
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case gt_match_pfx_list(CalledGT, PrefixList) of
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true ->
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case check_for_invoke_sri_sm(SccpDec) of
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true ->
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CalledGTNew = CalledGT#global_title{trans_type = 3},
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CalledPartyNew = CalledParty#sccp_addr{global_title = CalledGTNew},
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ParamsOut = lists:keyreplace(called_party_addr, 1, Opts,
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{called_party_addr, CalledPartyNew}),
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SccpDec#sccp_msg{parameters=ParamsOut};
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_ ->
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SccpDec
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end;
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_ ->
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SccpDec
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end;
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_ ->
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SccpDec
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end;
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mangle_tt_sri_sm(_, _, _, SccpIn) ->
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SccpIn.
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