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% MAP masquerading application
% (C) 2010 by Harald Welte <laforge@gnumonks.org>
% (C) 2010 by On-Waves
%
% All Rights Reserved
%
% This program is free software; you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation; either version 2 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 General Public License along
% with this program; if not, write to the Free Software Foundation, Inc.,
% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-module(tcap_udp_server).
-compile(export_all).
-define(PATCH_HLR_NUMBER, [1]).
-define(PATCH_SGSN_NUMBER, [2]).
-define(PATCH_SGSN_ADDRESS, [3]).
-define(PATCH_VMSC_ADDRESS, [4]).
-define(PATCH_GSMSCF_ADDRESS, [5]).
-include("MAP.hrl").
init(ServerPort) ->
{ok, Sock} = gen_udp:open(ServerPort, [binary, inet]),
loop().
% patch a UpdateGprsLocationArg and replace SGSN number and SGSN address
% !!! TESTING ONLY !!!
patch_UpdateGprsLocationArg(Arg) ->
Arg1 = Arg#'UpdateGprsLocationArg'{'sgsn-Number' = ?PATCH_SGSN_NUMBER},
Arg1#'UpdateGprsLocationArg'{'sgsn-Address' = ?PATCH_SGSN_ADDRESS}.
% Some other SGSN is sendingu us a GPRS location update. In the response,
% we indicate teh HLR number, which we need to masquerade
patch_UpdateGprsLocationRes(Arg) ->
Arg#'UpdateGprsLocationRes'{'hlr-Number' = ?PATCH_HLR_NUMBER}.
% Some other MSC/VLR is sendingu us a GSM location update. In the response,
% we indicate teh HLR number, which we need to masquerade
patch_UpdateLocationRes(Arg) ->
Arg#'UpdateLocationRes'{'hlr-Number' = ?PATCH_HLR_NUMBER}.
% HLR responds to VLR's MAP_RESTORE_REQ (i.e. it has lost information)
patch_RestoreDataRes(Arg) ->
Arg#'RestoreDataRes'{'hlr-Number' = ?PATCH_HLR_NUMBER}.
% HLR sends subscriber data to VLR/SGSN, including CAMEL info
patch_InsertSubscriberDataArg(Arg) ->
VlrCamel = Arg#'InsertSubscriberDataArg'.'vlrCamelSubscriptionInfo',
Arg1 = Arg#'InsertSubscriberDataArg'{'vlrCamelSubscriptionInfo' = patch_vlrCamelSubscrInfo(VlrCamel)},
%SgsnCamel = Arg#'InsertSubscriberDataArg'.'sgsn-CAMEL-SubscriptionInfo',
%Arg#'InsertSubscriberDataArg'{'sgsn-CAMEL-SubscriptionInfo' = patch_sgsnCamelSubscrInfo(SgsnCamel)},
Arg1.
% CAMEL related parsing
patch_oBcsmCamelTDPDataList(List) ->
% we reverse the origianl list, as the tail recursive _acc function
% will invert the order of components again
patch_oBcsmCamelTDPDataList_acc(lists:reverse(List), []).
patch_oBcsmCamelTDPDataList_acc([], NewList) -> NewList;
patch_oBcsmCamelTDPDataList_acc([TdpData|Tail], NewList) ->
case TdpData of
#'O-BcsmCamelTDPData'{'gsmSCF-Address'=ScfAddr} ->
NewTdpData = TdpData#'O-BcsmCamelTDPData'{'gsmSCF-Address'=?PATCH_GSMSCF_ADDRESS};
_ ->
NewTdpData = TdpData
end,
patch_oBcsmCamelTDPDataList_acc(Tail, [NewTdpData|NewList]).
patch_GprsCamelTDPDataList(List) ->
% we reverse the origianl list, as the tail recursive _acc function
% will invert the order of components again
patch_GprsCamelTDPDataList_acc(lists:reverse(List), []).
patch_GprsCamelTDPDataList_acc([], NewList) -> NewList;
patch_GprsCamelTDPDataList_acc([TdpData|Tail], NewList) ->
case TdpData of
#'GPRS-CamelTDPData'{'gsmSCF-Address'=ScfAddr} ->
NewTdpData = TdpData#'GPRS-CamelTDPData'{'gsmSCF-Address'=?PATCH_GSMSCF_ADDRESS};
_ ->
NewTdpData = TdpData
end,
patch_GprsCamelTDPDataList_acc(Tail, [NewTdpData|NewList]).
patch_SmsCamelTDPDataList(List) ->
% we reverse the origianl list, as the tail recursive _acc function
% will invert the order of components again
patch_SmsCamelTDPDataList_acc(lists:reverse(List), []).
patch_SmsCamelTDPDataList_acc([], NewList) -> NewList;
patch_SmsCamelTDPDataList_acc([TdpData|Tail], NewList) ->
case TdpData of
#'SMS-CAMEL-TDP-Data'{'gsmSCF-Address'=ScfAddr} ->
NewTdpData = TdpData#'SMS-CAMEL-TDP-Data'{'gsmSCF-Address'=?PATCH_GSMSCF_ADDRESS};
_ ->
NewTdpData = TdpData
end,
patch_GprsCamelTDPDataList_acc(Tail, [NewTdpData|NewList]).
patch_vlrCamelSubscrInfo(VlrCamel) ->
case VlrCamel of
asn1_NOVALUE ->
% return the original (empty) VlrCamelSubscrInfo
VlrCamel;
#'VlrCamelSubscriptionInfo'{} ->
case VlrCamel of
#'VlrCamelSubscriptionInfo'{'o-CSI'={#'O-CSI'{'o-BcsmCamelTDPDataList'=TdpList}}} ->
NewTdpList = patch_oBcsmCamelTDPDataList(TdpList),
VlrCamel1 = VlrCamel#'VlrCamelSubscriptionInfo'{'o-CSI'={#'O-CSI'{'o-BcsmCamelTDPDataList'=NewTdpList}}};
_ ->
VlrCamel1 = VlrCamel
end,
case VlrCamel1 of
#'VlrCamelSubscriptionInfo'{'mo-sms-CSI'={#'SMS-CSI'{'sms-CAMEL-TDP-DataList'=MoSmsTdpList}}} ->
NewMoSmsTdpList = patch_SmsCamelTDPDataList(MoSmsTdpList),
VlrCamel2 = VlrCamel1#'VlrCamelSubscriptionInfo'{'mo-sms-CSI'={#'SMS-CSI'{'sms-CAMEL-TDP-DataList'=NewMoSmsTdpList}}};
_ ->
VlrCamel2 = VlrCamel1
end,
case VlrCamel2 of
#'VlrCamelSubscriptionInfo'{'mt-sms-CSI'={#'SMS-CSI'{'sms-CAMEL-TDP-DataList'=MtSmsTdpList}}} ->
NewMtSmsTdpList = patch_SmsCamelTDPDataList(MtSmsTdpList),
VlrCamel3 = VlrCamel2#'VlrCamelSubscriptionInfo'{'mt-sms-CSI'={#'SMS-CSI'{'sms-CAMEL-TDP-DataList'=NewMtSmsTdpList}}};
_ ->
VlrCamel3 = VlrCamel2
end,
case VlrCamel3 of
#'VlrCamelSubscriptionInfo'{'ss-CSI'={#'SS-CSI'{'ss-CamelData'=#'SS-CamelData'{'gsmSCF-Address'=SSgsmSCF}}}} ->
VlrCamel4 = #'VlrCamelSubscriptionInfo'{'ss-CSI'={#'SS-CSI'{'ss-CamelData'=#'SS-CamelData'{'gsmSCF-Address'=?PATCH_GSMSCF_ADDRESS}}}};
_ ->
VlrCamel4 = VlrCamel3
end,
% return the VlrCamelSubscrInfo with replaced TdpList
VlrCamel4;
_ ->
% return the original VlrCamelSubscrInfo without TdpList
VlrCamel
end.
patch_sgsnCamelSubscrInfo(SgsnCamel) ->
case SgsnCamel of
asn1_NOVALUE ->
% return the original (empty) SgsnCamelSubscrInfo
SgsnCamel;
#'SGSN-CAMEL-SubscriptionInfo'{} ->
case SgsnCamel of #'SGSN-CAMEL-SubscriptionInfo'{'gprs-CSI'={#'GPRS-CSI'{'gprs-CamelTDPDataList'=GprsTdpList}}} ->
NewGprsTdpList = patch_GprsCamelTDPDataList(GprsTdpList),
SgsnCamel1 = SgsnCamel#'SGSN-CAMEL-SubscriptionInfo'{'gprs-CSI'={#'GPRS-CSI'{'gprs-CamelTDPDataList'=NewGprsTdpList}}};
_ ->
SgsnCamel1 = SgsnCamel
end,
case SgsnCamel1 of #'SGSN-CAMEL-SubscriptionInfo'{'mo-sms-CSI'={#'SMS-CSI'{'sms-CAMEL-TDP-DataList'=MoSmsTdpList}}} ->
NewMoSmsTdpList = patch_SmsCamelTDPDataList(MoSmsTdpList),
SgsnCamel2 = SgsnCamel1#'SGSN-CAMEL-SubscriptionInfo'{'mo-sms-CSI'={#'SMS-CSI'{'sms-CAMEL-TDP-DataList'=NewMoSmsTdpList}}};
_ ->
SgsnCamel2 = SgsnCamel1
end,
case SgsnCamel1 of #'SGSN-CAMEL-SubscriptionInfo'{'mt-sms-CSI'={#'SMS-CSI'{'sms-CAMEL-TDP-DataList'=MtSmsTdpList}}} ->
NewMtSmsTdpList = patch_SmsCamelTDPDataList(MtSmsTdpList),
SgsnCamel3 = SgsnCamel2#'SGSN-CAMEL-SubscriptionInfo'{'mt-sms-CSI'={#'SMS-CSI'{'sms-CAMEL-TDP-DataList'=NewMtSmsTdpList}}};
_ ->
SgsnCamel3 = SgsnCamel2
end,
SgsnCamel3;
_ ->
% return the original VlrCamelSubscrInfo without TdpList
SgsnCamel
end.
% process the Argument of a particular MAP invocation
process_component_arg(OpCode, Arg) ->
case Arg of
asn1_NOVALUE -> Arg;
_ -> patch_UpdateGprsLocationArg(Arg)
end.
% recurse over all components
handle_tcap_components(List) ->
% we reverse the origianl list, as the tail recursive _acc function
% will invert the order of components again
handle_tcap_components_acc(lists:reverse(List), []).
handle_tcap_components_acc([], NewComponents) -> NewComponents;
handle_tcap_components_acc([Component|Tail], NewComponents) ->
case Component of
{basicROS, {Primitive, Body}} ->
io:format("handle component ~p primitive ~n", [Component]),
case Body of
% BEGIN
#'MapSpecificPDUs_begin_components_SEQOF_basicROS_invoke'{opcode={local, OpCode},
argument=Arg} ->
NewArg = process_component_arg(OpCode, Arg),
NewBody = Body#'MapSpecificPDUs_begin_components_SEQOF_basicROS_invoke'{argument=NewArg};
#'MapSpecificPDUs_begin_components_SEQOF_basicROS_returnResult'{result=#'MapSpecificPDUs_begin_components_SEQOF_basicROS_returnResult_result'{opcode={local, OpCode}, result=Arg}} ->
NewArg = process_component_arg(OpCode, Arg),
NewBody = Body#'MapSpecificPDUs_begin_components_SEQOF_basicROS_returnResult'{result=#'MapSpecificPDUs_begin_components_SEQOF_basicROS_returnResult_result'{result=NewArg}};
#'MapSpecificPDUs_begin_components_SEQOF_returnResultNotLast'{result=#'MapSpecificPDUs_begin_components_SEQOF_returnResultNotLast_result'{opcode={local, OpCode}, result=Arg}} ->
NewArg = process_component_arg(OpCode, Arg),
NewBody = Body#'MapSpecificPDUs_begin_components_SEQOF_returnResultNotLast'{result=#'MapSpecificPDUs_begin_components_SEQOF_returnResultNotLast_result'{result=NewArg}};
% END
#'MapSpecificPDUs_end_components_SEQOF_basicROS_invoke'{opcode={local, OpCode},
argument=Arg} ->
NewArg = process_component_arg(OpCode, Arg),
NewBody = Body#'MapSpecificPDUs_end_components_SEQOF_basicROS_invoke'{argument=NewArg};
#'MapSpecificPDUs_end_components_SEQOF_basicROS_returnResult'{result=#'MapSpecificPDUs_end_components_SEQOF_basicROS_returnResult_result'{opcode={local, OpCode}, result=Arg}} ->
NewArg = process_component_arg(OpCode, Arg),
NewBody = Body#'MapSpecificPDUs_end_components_SEQOF_basicROS_returnResult'{result=#'MapSpecificPDUs_end_components_SEQOF_basicROS_returnResult_result'{result=NewArg}};
#'MapSpecificPDUs_end_components_SEQOF_returnResultNotLast'{result=#'MapSpecificPDUs_end_components_SEQOF_returnResultNotLast_result'{opcode={local, OpCode}, result=Arg}} ->
NewArg = process_component_arg(OpCode, Arg),
NewBody = Body#'MapSpecificPDUs_end_components_SEQOF_returnResultNotLast'{result=#'MapSpecificPDUs_end_components_SEQOF_returnResultNotLast_result'{result=NewArg}};
% CONTINUE
#'MapSpecificPDUs_continue_components_SEQOF_basicROS_invoke'{opcode={local, OpCode},
argument=Arg} ->
NewArg = process_component_arg(OpCode, Arg),
NewBody = Body#'MapSpecificPDUs_continue_components_SEQOF_basicROS_invoke'{argument=NewArg};
#'MapSpecificPDUs_continue_components_SEQOF_basicROS_returnResult'{result=#'MapSpecificPDUs_continue_components_SEQOF_basicROS_returnResult_result'{opcode={local, OpCode}, result=Arg}} ->
NewArg = process_component_arg(OpCode, Arg),
NewBody = Body#'MapSpecificPDUs_end_components_SEQOF_basicROS_returnResult'{result=#'MapSpecificPDUs_end_components_SEQOF_basicROS_returnResult_result'{result=NewArg}};
#'MapSpecificPDUs_continue_components_SEQOF_returnResultNotLast'{result=#'MapSpecificPDUs_continue_components_SEQOF_returnResultNotLast_result'{opcode={local, OpCode}, result=Arg}} ->
NewArg = process_component_arg(OpCode, Arg),
NewBody = Body#'MapSpecificPDUs_continue_components_SEQOF_returnResultNotLast'{result=#'MapSpecificPDUs_continue_components_SEQOF_returnResultNotLast_result'{result=NewArg}};
_ ->
NewBody = Body
end,
%NewBody = setelement(5, Body, NewArg)
NewComponent = {basicROS, {Primitive, NewBody}};
_ ->
NewComponent = Component
end,
io:format("=> modified component ~p~n", [NewComponent]),
handle_tcap_components_acc(Tail, [NewComponent|NewComponents]).
handle_tcap_msg_dec(Type, TcapMsgDec) ->
case {Type, TcapMsgDec} of
{'unidirectional', #'MapSpecificPDUs_unidirectional'{dialoguePortion=Dialg,
components=Components}} ->
NewComponents = handle_tcap_components(Components),
NewTcapMsgDec = TcapMsgDec#'MapSpecificPDUs_unidirectional'{components=NewComponents};
{'begin', #'MapSpecificPDUs_begin'{components=Components}} ->
NewComponents = handle_tcap_components(Components),
NewTcapMsgDec = TcapMsgDec#'MapSpecificPDUs_begin'{components=NewComponents};
{'continue', #'MapSpecificPDUs_continue'{dialoguePortion=Dialg, components=Components}} ->
NewComponents = handle_tcap_components(Components),
NewTcapMsgDec = TcapMsgDec#'MapSpecificPDUs_continue'{components=NewComponents};
{'end', #'MapSpecificPDUs_end'{components=Components}} ->
NewComponents = handle_tcap_components(Components),
NewTcapMsgDec = TcapMsgDec#'MapSpecificPDUs_end'{components=NewComponents};
_ ->
NewTcapMsgDec = TcapMsgDec
end,
io:format("=> new TcapMsgDec ~p~n", [NewTcapMsgDec]),
{Type, NewTcapMsgDec}.
handle_tcap_msg(PayloadL) ->
io:format("aboout to tcap_msg_dec..."),
case asn1rt:decode('MAP', 'MapSpecificPDUs', PayloadL) of
{ok, {Type, TcapMsgDec}} ->
io:format("success!~n"),
handle_tcap_msg_dec(Type, TcapMsgDec);
Error -> Error
end.
loop() ->
io:format("udp_server_loop~n"),
receive {udp, Sock, ClientIP, ClientPort, Packet} ->
io:format("UDP received from ~p:~p ==> ~p~n", [ClientIP, ClientPort, Packet]),
handle_tcap_msg(binary_to_list(Packet))%,
%loop()
end.
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