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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/>.
-module(mgw_nat_test).
-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").
pcap_apply(File, Filter, Args) ->
epcap:start([{file, File}, {filter, Filter}]),
loop(Args).
loop(Args) ->
receive
[{pkthdr, {_,_,_,{datalink,Datalink}}}, {packet, Packet}] ->
Decaps = epcap_net:decapsulate_dlt(Datalink, Packet),
handle_pkt_cb(Decaps, Args),
loop(Args);
{epcap, eof} ->
?debugFmt("EOF from PCAP~n", []),
epcap:stop();
Default ->
?debugFmt("Unknown ~p from PCAP~n", [Default])
end.
handle_pkt_cb([Ether, IP, Hdr, Payload], Args) ->
?debugFmt("~p:~n ~p/~p~n", [IP, Hdr, Payload]),
case Hdr of
#sctp{chunks = Chunks} ->
handle_sctp_chunks(Chunks, [Ether, IP, Hdr], 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=2, 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, 2, Data);
_ ->
ok
end,
handle_sctp_chunks(Tail, Path, Args).
% Rewrite at SCTP (root) level:
shim_rw_actor(sctp, From, Path, 2, DataBin) ->
?debugFmt("sctp:~p:~p~n", [From, DataBin]),
mgw_nat:mangle_rx_data(From, Path, DataBin, fun shim_rw_actor/5);
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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