remove sctp_handler.erl from osmo_ss7, it belongs to mgw_nat
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@ -7,8 +7,7 @@
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isup_codec,
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m2ua_codec,
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mtp3_codec,
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sccp_codec, sccp_scoc, sccp_scrc,
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sctp_handler
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sccp_codec, sccp_scoc, sccp_scrc
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]},
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{registered, []},
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{applications, []},
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@ -1,163 +0,0 @@
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% SCTP Handler for gateway between MSC and STP, transparently
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% rewriting addresses on the fly
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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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-module(sctp_handler).
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-author("Harald Welte <laforge@gnumonks.org>").
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-export([init/5, handle_sctp/2]).
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-include_lib("kernel/include/inet.hrl").
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-include_lib("kernel/include/inet_sctp.hrl").
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%-include("m2ua.hrl").
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%-include("mtp3.hrl").
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%-include("isup.hrl").
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%-include("sccp.hrl").
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-record(loop_data,
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{msc_sock, msc_local_ip, msc_remote_ip, msc_remote_port,
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msc_local_port, msc_assoc_id,
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stp_sock, stp_remote_ip, stp_remote_port, stp_assoc_id
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}).
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-define(COMMON_SOCKOPTS, [{active, once}, {reuseaddr, true}]).
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% initialize the sockets towards MSC (listening) and STP (connect)
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init(MscLocalIP, MscLocalPort, MscRemoteIP, StpRemoteIP, StpRemotePort) ->
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{ok, MscSock} = gen_sctp:open([{ip, MscLocalIP},{port,MscLocalPort}]
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++ ?COMMON_SOCKOPTS),
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io:format("Listening for MSC on ~w:~w. ~w~n",
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[MscLocalIP, MscLocalPort, MscSock]),
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ok = gen_sctp:listen(MscSock, true),
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{ok, StpSock} = gen_sctp:open(?COMMON_SOCKOPTS),
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L = #loop_data{msc_sock = MscSock, msc_local_ip = MscLocalIP,
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msc_remote_ip = MscRemoteIP,
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stp_sock = StpSock, stp_remote_ip = StpRemoteIP,
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stp_remote_port = StpRemotePort},
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{ok, L}.
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% initiate a connection to STP as a client
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initiate_stp_connection(#loop_data{stp_sock = Sock, stp_remote_ip = IP, stp_remote_port = Port}, Opts) ->
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io:format("Establishing SCTP conn to STP ~p Port ~p~n", [IP, Port]),
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gen_sctp:connect(Sock, IP, Port, Opts ++ ?COMMON_SOCKOPTS).
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% main loop function
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handle_sctp(L = #loop_data{msc_sock=MscSock, msc_remote_ip=MscRemoteIp, msc_remote_port=MscRemotePort,
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stp_sock=StpSock, stp_remote_ip=StpRemoteIp, stp_remote_port=StpRemotePort},
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Sctp) ->
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io:format("Entering receive loop ~p~n", [L]),
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io:format("======================================================================~n"),
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case Sctp of
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% MSC connect or disconnect
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{sctp, MscSock, MscRemoteIp, Port, {ANC, SAC}}
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when is_record(SAC, sctp_assoc_change) ->
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io:format("MSC sctp_assoc_change ~p ~p~n", [ANC, SAC]),
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#sctp_assoc_change{state = SacState, outbound_streams = OutStreams,
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inbound_streams = InStreams, assoc_id = MscAssocId} = SAC,
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case SacState of
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comm_up ->
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InitMsg = #sctp_initmsg{num_ostreams=InStreams,
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max_instreams=OutStreams},
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{ok, StpAssoc} = initiate_stp_connection(L, [{sctp_initmsg,InitMsg}]),
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io:format("STP Assoc: ~p~n", [StpAssoc]),
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NewL = L#loop_data{msc_remote_port = Port,
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msc_assoc_id = MscAssocId,
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stp_assoc_id = StpAssoc#sctp_assoc_change.assoc_id};
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comm_lost ->
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NewL = L,
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% maybe we should simply die?
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io:format("MSC SCTP comm_lost~n"),
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exit(1);
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addr_unreachable ->
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NewL = L,
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io:format("MSC SCTP addr_unreachable~n"),
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% maybe we should simply die?
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exit(1)
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end,
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inet:setopts(MscSock, [{active, once}]);
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% STP connect or disconnect
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{sctp, StpSock, StpRemoteIp, StpRemotePort, {_Anc, SAC}}
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when is_record(SAC, sctp_assoc_change) ->
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io:format("STP sctp_assoc_change ~p~n", [SAC]),
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inet:setopts(StpSock, [{active, once}]),
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NewL = L;
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% MSC data
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{sctp, MscSock, MscRemoteIp, MscRemotePort, {[Anc], Data}} ->
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io:format("MSC rx data: ~p ~p~n", [Anc, Data]),
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handle_rx_data(L, from_msc, Anc, Data),
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inet:setopts(MscSock, [{active, once}]),
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NewL = L;
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% STP data
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{sctp, StpSock, StpRemoteIp, StpRemotePort, {[Anc], Data}} ->
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io:format("STP rx data: ~p ~p~n", [Anc, Data]),
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handle_rx_data(L, from_stp, Anc, Data),
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inet:setopts(StpSock, [{active, once}]),
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NewL = L;
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{sctp, _Sock, RemoteIp, _Remote_port, {_Anc, Data}}
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when is_record(Data, sctp_shutdown_event) ->
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% maybe we should simply die?
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NewL = L,
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io:format("SCTP remote ~p shutdown~n", [RemoteIp]),
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exit(1);
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Other ->
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io:format("OTHER ~p~n", [Other]),
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NewL = L
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end,
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NewL.
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try_mangle(L, From, Data) ->
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try mgw_nat:mangle_rx_data(L, From, Data) 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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io:format("MGW NAT mangling Error: ~p~n", [Error]),
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Data
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end.
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% handle incoming data on one of the SCTP sockets
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handle_rx_data(_L, From, SRInfo, Data) when is_binary(Data) ->
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io:format("Unhandled Rx Data from SCTP from ~p: ~p, ~p~n", [From, SRInfo, Data]);
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handle_rx_data(L, From, SRInf = #sctp_sndrcvinfo{ppid = 2,
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stream = Stream}, Data) when is_binary(Data) ->
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DataOut = try_mangle(L, From, Data),
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% send mangled data to other peer
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case From of
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from_msc ->
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Sock = L#loop_data.stp_sock,
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AssocId = L#loop_data.stp_assoc_id;
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from_stp ->
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Sock = L#loop_data.msc_sock,
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AssocId = L#loop_data.msc_assoc_id
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end,
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SndRcvInfo = #sctp_sndrcvinfo{ppid = 2, stream = Stream, assoc_id = AssocId},
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%io:format("Sending ~p to ~p ~p~n", [DataOut, Sock, SndRcvInfo]),
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% if they are not equal, we will abort here
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if DataOut == Data ->
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ok;
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true ->
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io:format("Data is NOT equal~n")
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end,
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ok = gen_sctp:send(Sock, SndRcvInfo, DataOut).
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