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% MGW Nat testing code
% (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/>.
%
% Additional Permission under GNU AGPL version 3 section 7:
%
% If you modify this Program, or any covered work, by linking or
% combining it with runtime libraries of Erlang/OTP as released by
% Ericsson on http://www.erlang.org (or a modified version of these
% libraries), containing parts covered by the terms of the Erlang Public
% License (http://www.erlang.org/EPLICENSE), the licensors of this
% Program grant you additional permission to convey the resulting work
% without the need to license the runtime libraries of Erlang/OTP under
% the GNU Affero General Public License. Corresponding Source for a
% non-source form of such a combination shall include the source code
% for the parts of the runtime libraries of Erlang/OTP used as well as
% that of the covered work.
-module(osmo_ss7_pcap).
-author("Harald Welte <laforge@gnumonks.org>").
-export([pcap_apply/3]).
-define(NODEBUG, 1).
-include_lib("eunit/include/eunit.hrl").
-include_lib("epcap/include/epcap_net.hrl").
-record(loop_data, {
args,
pkt_nr
}).
pcap_apply(File, Filter, Args) ->
epcap:start([{file, File}, {filter, Filter}]),
loop(#loop_data{args = Args, pkt_nr = 1}).
loop(L = #loop_data{args=Args, pkt_nr = PktNr}) ->
receive
[{pkthdr, {_,_,_,{datalink,Datalink}}}, {packet, Packet}] ->
Decaps = epcap_net:decapsulate_dlt(Datalink, Packet),
handle_pkt_cb(PktNr, Decaps, Args),
loop(L#loop_data{pkt_nr = PktNr+1});
{epcap, eof} ->
?debugFmt("EOF from PCAP~n", []),
epcap:stop(),
{ok, PktNr-1};
Default ->
?debugFmt("Unknown ~p from PCAP~n", [Default])
end.
handle_pkt_cb(PktNr, [Ether, IP, Hdr, Payload], Args) ->
?debugFmt("~p:~n ~p/~p~n", [IP, Hdr, Payload]),
case Hdr of
#sctp{chunks = Chunks} ->
Path = [{epcap_pkt_nr, PktNr}, Ether, IP, Hdr],
handle_sctp_chunks(Chunks, Path, Args);
_ ->
ok
end.
handle_sctp_chunks([], _Path, _Args) ->
ok;
handle_sctp_chunks([Head|Tail], Path, Args) ->
RewriteFn = proplists:get_value(rewrite_fn, Args),
case Head of
#sctp_chunk{type = 0, payload=#sctp_chunk_data{ppi=Ppi, data=Data}} ->
%mgw_nat:mangle_rx_data(l, from_stp, Data, fun handle_rewrite_cb/5);
put(rewrite_cb, RewriteFn),
shim_rw_actor(sctp, from_msc, Path, Ppi, Data);
_ ->
ok
end,
handle_sctp_chunks(Tail, Path, Args).
shim_rw_actor(Proto, From, Path, MsgType, Msg) ->
?debugFmt(" IN:~p:~p:~p~n", [Proto, From, Msg]),
Fn = get(rewrite_cb),
MsgOut = Fn(Proto, From, Path, MsgType, Msg),
case MsgOut of
Msg ->
MsgOut;
_ ->
%io:format("OUT:~p:~p:~p~n", [Proto, From, MsgOut]),
MsgOut
end.
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