mirror of
https://github.com/processone/ejabberd.git
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409 lines
16 KiB
Erlang
409 lines
16 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_websocket.erl
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%%% Author : Eric Cestari <ecestari@process-one.net>
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%%% Purpose : XMPP Websocket support
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%%% Created : 09-10-2010 by Eric Cestari <ecestari@process-one.net>
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%%%
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%%% Some code lifted from MISULTIN - WebSocket misultin_websocket.erl - >-|-|-(°>
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%%% (http://github.com/ostinelli/misultin/blob/master/src/misultin_websocket.erl)
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%%% Copyright (C) 2010, Roberto Ostinelli <roberto@ostinelli.net>, Joe Armstrong.
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%%% All rights reserved.
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%%%
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%%% Code portions from Joe Armstrong have been originally taken under MIT license at the address:
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%%% <http://armstrongonsoftware.blogspot.com/2009/12/comet-is-dead-long-live-websockets.html>
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%%%
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%%% BSD License
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%%%
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%%% Redistribution and use in source and binary forms, with or without modification, are permitted provided
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%%% that the following conditions are met:
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%%%
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%%% * Redistributions of source code must retain the above copyright notice, this list of conditions and the
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%%% following disclaimer.
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%%% * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
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%%% the following disclaimer in the documentation and/or other materials provided with the distribution.
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%%% * Neither the name of the authors nor the names of its contributors may be used to endorse or promote
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%%% products derived from this software without specific prior written permission.
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%%%
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%%% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
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%%% WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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%%% PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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%%% ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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%%% TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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%%% HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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%%% NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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%%% POSSIBILITY OF SUCH DAMAGE.
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%%% ==========================================================================================================
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%%% ejabberd, Copyright (C) 2002-2016 ProcessOne
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%%%----------------------------------------------------------------------
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-module(ejabberd_websocket).
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-protocol({rfc, 6455}).
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-author('ecestari@process-one.net').
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-export([check/2, socket_handoff/8]).
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-include("ejabberd.hrl").
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-include("logger.hrl").
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-include("jlib.hrl").
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-include("ejabberd_http.hrl").
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-define(CT_XML, {<<"Content-Type">>, <<"text/xml; charset=utf-8">>}).
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-define(CT_PLAIN, {<<"Content-Type">>, <<"text/plain">>}).
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-define(AC_ALLOW_ORIGIN, {<<"Access-Control-Allow-Origin">>, <<"*">>}).
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-define(AC_ALLOW_METHODS, {<<"Access-Control-Allow-Methods">>, <<"GET, OPTIONS">>}).
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-define(AC_ALLOW_HEADERS, {<<"Access-Control-Allow-Headers">>, <<"Content-Type">>}).
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-define(AC_MAX_AGE, {<<"Access-Control-Max-Age">>, <<"86400">>}).
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-define(OPTIONS_HEADER, [?CT_PLAIN, ?AC_ALLOW_ORIGIN, ?AC_ALLOW_METHODS,
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?AC_ALLOW_HEADERS, ?AC_MAX_AGE]).
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-define(HEADER, [?CT_XML, ?AC_ALLOW_ORIGIN, ?AC_ALLOW_HEADERS]).
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check(_Path, Headers) ->
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RequiredHeaders = [{'Upgrade', <<"websocket">>},
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{'Connection', ignore}, {'Host', ignore},
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{<<"Sec-Websocket-Key">>, ignore},
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{<<"Sec-Websocket-Version">>, <<"13">>}],
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F = fun ({Tag, Val}) ->
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case lists:keyfind(Tag, 1, Headers) of
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false -> true; % header not found, keep in list
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{_, HVal} ->
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case Val of
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ignore -> false; % ignore value -> ok, remove from list
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_ ->
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% expected value -> ok, remove from list (false)
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% value is different, keep in list (true)
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str:to_lower(HVal) /= Val
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end
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end
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end,
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case lists:filter(F, RequiredHeaders) of
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[] -> true;
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_MissingHeaders -> false
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end.
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socket_handoff(LocalPath, #request{method = 'GET', ip = IP, q = Q, path = Path,
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headers = Headers, host = Host, port = Port,
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opts = HOpts},
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Socket, SockMod, Buf, _Opts, HandlerModule, InfoMsgFun) ->
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case check(LocalPath, Headers) of
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true ->
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WS = #ws{socket = Socket,
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sockmod = SockMod,
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ip = IP,
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q = Q,
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host = Host,
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port = Port,
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path = Path,
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headers = Headers,
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local_path = LocalPath,
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buf = Buf,
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http_opts = HOpts},
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connect(WS, HandlerModule);
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_ ->
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{200, ?HEADER, InfoMsgFun()}
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end;
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socket_handoff(_, #request{method = 'OPTIONS'}, _, _, _, _, _, _) ->
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{200, ?OPTIONS_HEADER, []};
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socket_handoff(_, #request{method = 'HEAD'}, _, _, _, _, _, _) ->
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{200, ?HEADER, []};
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socket_handoff(_, _, _, _, _, _, _, _) ->
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{400, ?HEADER, #xmlel{name = <<"h1">>,
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children = [{xmlcdata, <<"400 Bad Request">>}]}}.
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connect(#ws{socket = Socket, sockmod = SockMod} = Ws, WsLoop) ->
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{NewWs, HandshakeResponse} = handshake(Ws),
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SockMod:send(Socket, HandshakeResponse),
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?DEBUG("Sent handshake response : ~p",
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[HandshakeResponse]),
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Ws0 = {Ws, self()},
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{ok, WsHandleLoopPid} = WsLoop:start_link(Ws0),
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erlang:monitor(process, WsHandleLoopPid),
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case NewWs#ws.buf of
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<<>> ->
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ok;
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Data ->
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self() ! {raw, Socket, Data}
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end,
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% set opts
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case SockMod of
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gen_tcp ->
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inet:setopts(Socket, [{packet, 0}, {active, true}]);
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_ ->
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SockMod:setopts(Socket, [{packet, 0}, {active, true}])
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end,
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ws_loop(none, Socket, WsHandleLoopPid, SockMod).
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handshake(#ws{headers = Headers} = State) ->
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{_, Key} = lists:keyfind(<<"Sec-Websocket-Key">>, 1,
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Headers),
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SubProtocolHeader = case find_subprotocol(Headers) of
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false ->
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[];
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V ->
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[<<"Sec-Websocket-Protocol:">>, V, <<"\r\n">>]
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end,
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Hash = jlib:encode_base64(
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p1_sha:sha1(<<Key/binary, "258EAFA5-E914-47DA-95CA-C5AB0DC85B11">>)),
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{State, [<<"HTTP/1.1 101 Switching Protocols\r\n">>,
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<<"Upgrade: websocket\r\n">>,
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<<"Connection: Upgrade\r\n">>,
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SubProtocolHeader,
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<<"Sec-WebSocket-Accept: ">>, Hash, <<"\r\n\r\n">>]}.
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find_subprotocol(Headers) ->
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case lists:keysearch(<<"Sec-Websocket-Protocol">>, 1, Headers) of
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false ->
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case lists:keysearch(<<"Websocket-Protocol">>, 1, Headers) of
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false ->
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false;
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{value, {_, Protocol2}} ->
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Protocol2
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end;
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{value, {_, Protocol}} ->
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Protocol
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end.
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ws_loop(FrameInfo, Socket, WsHandleLoopPid, SocketMode) ->
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receive
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{DataType, _Socket, Data} when DataType =:= tcp orelse DataType =:= raw ->
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case handle_data(DataType, FrameInfo, Data, Socket, WsHandleLoopPid, SocketMode) of
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{error, Error} ->
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?DEBUG("tls decode error ~p", [Error]),
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websocket_close(Socket, WsHandleLoopPid, SocketMode, 1002); % protocol error
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{NewFrameInfo, ToSend} ->
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lists:foreach(fun(Pkt) -> SocketMode:send(Socket, Pkt)
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end, ToSend),
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ws_loop(NewFrameInfo, Socket, WsHandleLoopPid, SocketMode)
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end;
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{tcp_closed, _Socket} ->
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?DEBUG("tcp connection was closed, exit", []),
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websocket_close(Socket, WsHandleLoopPid, SocketMode, 0);
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{'DOWN', Ref, process, WsHandleLoopPid, Reason} ->
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Code = case Reason of
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normal ->
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1000; % normal close
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_ ->
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?ERROR_MSG("linked websocket controlling loop crashed "
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"with reason: ~p",
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[Reason]),
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1011 % internal error
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end,
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erlang:demonitor(Ref),
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websocket_close(Socket, WsHandleLoopPid, SocketMode, Code);
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{send, Data} ->
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SocketMode:send(Socket, encode_frame(Data, 1)),
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ws_loop(FrameInfo, Socket, WsHandleLoopPid,
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SocketMode);
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{ping, Data} ->
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SocketMode:send(Socket, encode_frame(Data, 9)),
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ws_loop(FrameInfo, Socket, WsHandleLoopPid,
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SocketMode);
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shutdown ->
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?DEBUG("shutdown request received, closing websocket "
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"with pid ~p",
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[self()]),
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websocket_close(Socket, WsHandleLoopPid, SocketMode, 1001); % going away
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_Ignored ->
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?WARNING_MSG("received unexpected message, ignoring: ~p",
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[_Ignored]),
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ws_loop(FrameInfo, Socket, WsHandleLoopPid,
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SocketMode)
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end.
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encode_frame(Data, Opcode) ->
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case byte_size(Data) of
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S1 when S1 < 126 ->
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<<1:1, 0:3, Opcode:4, 0:1, S1:7, Data/binary>>;
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S2 when S2 < 65536 ->
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<<1:1, 0:3, Opcode:4, 0:1, 126:7, S2:16, Data/binary>>;
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S3 ->
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<<1:1, 0:3, Opcode:4, 0:1, 127:7, S3:64, Data/binary>>
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end.
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-record(frame_info,
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{mask = none, offset = 0, left, final_frame = true,
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opcode, unprocessed = <<>>, unmasked = <<>>,
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unmasked_msg = <<>>}).
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decode_header(<<Final:1, _:3, Opcode:4, 0:1,
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Len:7, Data/binary>>)
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when Len < 126 ->
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{Len, Final, Opcode, none, Data};
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decode_header(<<Final:1, _:3, Opcode:4, 0:1,
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126:7, Len:16/integer, Data/binary>>) ->
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{Len, Final, Opcode, none, Data};
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decode_header(<<Final:1, _:3, Opcode:4, 0:1,
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127:7, Len:64/integer, Data/binary>>) ->
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{Len, Final, Opcode, none, Data};
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decode_header(<<Final:1, _:3, Opcode:4, 1:1,
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Len:7, Mask:4/binary, Data/binary>>)
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when Len < 126 ->
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{Len, Final, Opcode, Mask, Data};
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decode_header(<<Final:1, _:3, Opcode:4, 1:1,
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126:7, Len:16/integer, Mask:4/binary, Data/binary>>) ->
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{Len, Final, Opcode, Mask, Data};
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decode_header(<<Final:1, _:3, Opcode:4, 1:1,
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127:7, Len:64/integer, Mask:4/binary, Data/binary>>) ->
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{Len, Final, Opcode, Mask, Data};
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decode_header(_) -> none.
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unmask_int(Offset, _, <<>>, Acc) ->
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{Acc, Offset};
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unmask_int(0, <<M:32>> = Mask,
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<<N:32, Rest/binary>>, Acc) ->
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unmask_int(0, Mask, Rest,
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<<Acc/binary, (M bxor N):32>>);
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unmask_int(0, <<M:8, _/binary>> = Mask,
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<<N:8, Rest/binary>>, Acc) ->
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unmask_int(1, Mask, Rest,
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<<Acc/binary, (M bxor N):8>>);
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unmask_int(1, <<_:8, M:8, _/binary>> = Mask,
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<<N:8, Rest/binary>>, Acc) ->
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unmask_int(2, Mask, Rest,
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<<Acc/binary, (M bxor N):8>>);
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unmask_int(2, <<_:16, M:8, _/binary>> = Mask,
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<<N:8, Rest/binary>>, Acc) ->
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unmask_int(3, Mask, Rest,
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<<Acc/binary, (M bxor N):8>>);
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unmask_int(3, <<_:24, M:8>> = Mask,
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<<N:8, Rest/binary>>, Acc) ->
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unmask_int(0, Mask, Rest,
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<<Acc/binary, (M bxor N):8>>).
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unmask(#frame_info{mask = none} = State, Data) ->
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{State, Data};
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unmask(#frame_info{mask = Mask, offset = Offset} = State, Data) ->
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{Unmasked, NewOffset} = unmask_int(Offset, Mask,
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Data, <<>>),
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{State#frame_info{offset = NewOffset}, Unmasked}.
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process_frame(none, Data) ->
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process_frame(#frame_info{}, Data);
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process_frame(#frame_info{left = Left} = FrameInfo, <<>>) when Left > 0 ->
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{FrameInfo, [], []};
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process_frame(#frame_info{unprocessed = none,
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unmasked = UnmaskedPre, left = Left} =
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State,
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Data)
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when byte_size(Data) < Left ->
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{State2, Unmasked} = unmask(State, Data),
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{State2#frame_info{left = Left - byte_size(Data),
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unmasked = [UnmaskedPre, Unmasked]},
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[], []};
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process_frame(#frame_info{unprocessed = none,
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unmasked = UnmaskedPre, opcode = Opcode,
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final_frame = Final, left = Left,
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unmasked_msg = UnmaskedMsg} =
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FrameInfo,
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Data) ->
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<<ToProcess:(Left)/binary, Unprocessed/binary>> = Data,
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{_, Unmasked} = unmask(FrameInfo, ToProcess),
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case Final of
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true ->
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{FrameInfo3, Recv, Send} = process_frame(#frame_info{},
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Unprocessed),
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case Opcode of
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X when X < 3 ->
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{FrameInfo3,
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[iolist_to_binary([UnmaskedMsg, UnmaskedPre, Unmasked])
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| Recv],
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Send};
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9 -> % Ping
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Frame = encode_frame(Unprocessed, 10),
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{FrameInfo3#frame_info{unmasked_msg = UnmaskedMsg}, [ping | Recv],
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[Frame | Send]};
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10 -> % Pong
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{FrameInfo3, [pong | Recv], Send};
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8 -> % Close
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CloseCode = case Unmasked of
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<<Code:16/integer-big, Message/binary>> ->
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?DEBUG("WebSocket close op: ~p ~s",
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[Code, Message]),
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Code;
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<<Code:16/integer-big>> ->
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?DEBUG("WebSocket close op: ~p", [Code]),
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Code;
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_ ->
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?DEBUG("WebSocket close op unknown: ~p",
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[Unmasked]),
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1000
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end,
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Frame = encode_frame(<<CloseCode:16/integer-big>>, 8),
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{FrameInfo3#frame_info{unmasked_msg=UnmaskedMsg}, Recv,
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[Frame | Send]};
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_ ->
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{FrameInfo3#frame_info{unmasked_msg = UnmaskedMsg}, Recv,
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Send}
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end;
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_ ->
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process_frame(#frame_info{unmasked_msg =
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[UnmaskedMsg, UnmaskedPre,
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Unmasked]},
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Unprocessed)
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end;
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process_frame(#frame_info{unprocessed = <<>>} =
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FrameInfo,
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Data) ->
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case decode_header(Data) of
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none ->
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{FrameInfo#frame_info{unprocessed = Data}, [], []};
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{Len, Final, Opcode, Mask, Rest} ->
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process_frame(FrameInfo#frame_info{mask = Mask,
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final_frame = Final == 1,
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left = Len, opcode = Opcode,
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unprocessed = none},
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Rest)
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end;
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process_frame(#frame_info{unprocessed =
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UnprocessedPre} =
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FrameInfo,
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Data) ->
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process_frame(FrameInfo#frame_info{unprocessed = <<>>},
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<<UnprocessedPre/binary, Data/binary>>).
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handle_data(tcp, FrameInfo, Data, Socket, WsHandleLoopPid, fast_tls) ->
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case fast_tls:recv_data(Socket, Data) of
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{ok, NewData} ->
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handle_data_int(FrameInfo, NewData, Socket, WsHandleLoopPid, fast_tls);
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{error, Error} ->
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{error, Error}
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end;
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handle_data(_, FrameInfo, Data, Socket, WsHandleLoopPid, SockMod) ->
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handle_data_int(FrameInfo, Data, Socket, WsHandleLoopPid, SockMod).
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handle_data_int(FrameInfo, Data, _Socket, WsHandleLoopPid, _SocketMode) ->
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{NewFrameInfo, Recv, Send} = process_frame(FrameInfo, Data),
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lists:foreach(fun (El) ->
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case El of
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pong ->
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WsHandleLoopPid ! pong;
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ping ->
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WsHandleLoopPid ! ping;
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_ ->
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WsHandleLoopPid ! {received, El}
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end
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end,
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Recv),
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{NewFrameInfo, Send}.
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websocket_close(Socket, WsHandleLoopPid,
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SocketMode, CloseCode) when CloseCode > 0 ->
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Frame = encode_frame(<<CloseCode:16/integer-big>>, 8),
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SocketMode:send(Socket, Frame),
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websocket_close(Socket, WsHandleLoopPid, SocketMode, 0);
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websocket_close(Socket, WsHandleLoopPid, SocketMode, _CloseCode) ->
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WsHandleLoopPid ! closed,
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SocketMode:close(Socket).
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