Chapril/xmpp.chapril.org-ejabberd
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xmpp.chapril.org-ejabberd/src/ejabberd_receiver.erl

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%%%----------------------------------------------------------------------
%%% File : ejabberd_receiver.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Socket receiver for C2S and S2S connections
%%% Created : 10 Nov 2003 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2010 ProcessOne
%%%
%%% 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., 59 Temple Place, Suite 330, Boston, MA
%%% 02111-1307 USA
%%%
%%%----------------------------------------------------------------------
-module(ejabberd_receiver).
-author('alexey@process-one.net').
-behaviour(gen_server).
%% API
-export([start_link/4,
start/3,
start/4,
change_shaper/2,
reset_stream/1,
starttls/2,
starttls/3,
compress/2,
send/2,
become_controller/2,
change_controller/2,
setopts/2,
close/1]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-include("ejabberd.hrl").
-record(state, {socket,
sock_mod,
shaper_state,
c2s_pid,
max_stanza_size,
xml_stream_state,
tref,
timeout}).
-define(HIBERNATE_TIMEOUT, 90000).
%%====================================================================
%% API
%%====================================================================
%%--------------------------------------------------------------------
%% Function: start_link() -> {ok,Pid} | ignore | {error,Error}
%% Description: Starts the server
%%--------------------------------------------------------------------
start_link(Socket, SockMod, Shaper, MaxStanzaSize) ->
gen_server:start_link(
?MODULE, [Socket, SockMod, Shaper, MaxStanzaSize], []).
%%--------------------------------------------------------------------
%% Function: start() -> {ok,Pid} | ignore | {error,Error}
%% Description: Starts the server
%%--------------------------------------------------------------------
start(Socket, SockMod, Shaper) ->
start(Socket, SockMod, Shaper, infinity).
start(Socket, SockMod, Shaper, MaxStanzaSize) ->
{ok, Pid} = supervisor:start_child(
ejabberd_receiver_sup,
[Socket, SockMod, Shaper, MaxStanzaSize]),
Pid.
change_shaper(Pid, Shaper) ->
gen_server:cast(Pid, {change_shaper, Shaper}).
reset_stream(Pid) ->
gen_server:call(Pid, reset_stream).
starttls(Pid, TLSOpts) ->
starttls(Pid, TLSOpts, undefined).
starttls(Pid, TLSOpts, Data) ->
gen_server:call(Pid, {starttls, TLSOpts, Data}).
compress(Pid, Data) ->
gen_server:call(Pid, {compress, Data}).
become_controller(Pid, C2SPid) ->
gen_server:call(Pid, {become_controller, C2SPid}).
change_controller(Pid, C2SPid) ->
gen_server:call(Pid, {change_controller, C2SPid}).
setopts(Pid, Opts) ->
case lists:member({active, false}, Opts) of
true ->
gen_server:call(Pid, deactivate_socket);
false ->
ok
end.
send(Pid, Data) ->
gen_server:call(Pid, {send, Data}).
close(Pid) ->
gen_server:cast(Pid, close).
%%====================================================================
%% gen_server callbacks
%%====================================================================
%%--------------------------------------------------------------------
%% Function: init(Args) -> {ok, State} |
%% {ok, State, Timeout} |
%% ignore |
%% {stop, Reason}
%% Description: Initiates the server
%%--------------------------------------------------------------------
init([Socket, SockMod, Shaper, MaxStanzaSize]) ->
ShaperState = shaper:new(Shaper),
Timeout = case SockMod of
ssl ->
20;
_ ->
infinity
end,
{ok, #state{socket = Socket,
sock_mod = SockMod,
shaper_state = ShaperState,
max_stanza_size = MaxStanzaSize,
timeout = Timeout}}.
%%--------------------------------------------------------------------
%% Function: %% handle_call(Request, From, State) -> {reply, Reply, State} |
%% {reply, Reply, State, Timeout} |
%% {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, Reply, State} |
%% {stop, Reason, State}
%% Description: Handling call messages
%%--------------------------------------------------------------------
handle_call({starttls, TLSOpts, Data}, _From, State) ->
{ok, TLSSocket} = tls:tcp_to_tls(State#state.socket, TLSOpts),
if Data /= undefined ->
do_send(State, Data);
true ->
ok
end,
NewXMLStreamState = do_reset_stream(State),
NewState = State#state{socket = TLSSocket,
sock_mod = tls,
xml_stream_state = NewXMLStreamState},
case tls:recv_data(TLSSocket, "") of
{ok, TLSData} ->
{NextState, Hib} = process_data(TLSData, NewState),
{reply, {ok, TLSSocket}, NextState, Hib};
{error, _Reason} ->
{stop, normal, ok, NewState}
end;
handle_call({compress, Data}, _From,
#state{xml_stream_state = XMLStreamState,
sock_mod = SockMod,
socket = Socket} = State) ->
{ok, ZlibSocket} = ejabberd_zlib:enable_zlib(SockMod, Socket),
if Data /= undefined ->
do_send(State, Data);
true ->
ok
end,
NewXMLStreamState = exmpp_xmlstream:reset(XMLStreamState),
NewState = State#state{socket = ZlibSocket,
sock_mod = ejabberd_zlib,
xml_stream_state = NewXMLStreamState},
case ejabberd_zlib:recv_data(ZlibSocket, "") of
{ok, ZlibData} ->
{NextState, Hib} = process_data(ZlibData, NewState),
{reply, {ok, ZlibSocket}, NextState, Hib};
{error, _Reason} ->
{stop, normal, ok, NewState}
end;
handle_call(reset_stream, _From,
#state{xml_stream_state = XMLStreamState} = State) ->
NewXMLStreamState = exmpp_xmlstream:reset(XMLStreamState),
Reply = ok,
{reply, Reply, State#state{xml_stream_state = NewXMLStreamState},
?HIBERNATE_TIMEOUT};
handle_call({become_controller, C2SPid}, _From, State) ->
erlang:monitor(process, C2SPid),
close_stream(State#state.xml_stream_state),
XMLStreamState = new_xmlstream(C2SPid, State#state.max_stanza_size),
NewState = State#state{c2s_pid = C2SPid,
xml_stream_state = XMLStreamState},
activate_socket(NewState),
Reply = ok,
{reply, Reply, NewState, ?HIBERNATE_TIMEOUT};
handle_call({change_controller, C2SPid}, _From, State) ->
erlang:monitor(process, C2SPid),
NewXMLStreamState = exmpp_xmlstream:change_callback(
State#state.xml_stream_state, {gen_fsm, C2SPid}),
NewState = State#state{c2s_pid = C2SPid,
xml_stream_state = NewXMLStreamState},
activate_socket(NewState),
{reply, ok, NewState, ?HIBERNATE_TIMEOUT};
handle_call({send, Data}, _From, State) ->
case do_send(State, Data) of
ok ->
{reply, ok, State, ?HIBERNATE_TIMEOUT};
{error, _Reason} = Err ->
{stop, normal, Err, State}
end;
handle_call(deactivate_socket, _From, State) ->
deactivate_socket(State),
{reply, ok, State, ?HIBERNATE_TIMEOUT};
handle_call(_Request, _From, State) ->
Reply = ok,
{reply, Reply, State, ?HIBERNATE_TIMEOUT}.
%%--------------------------------------------------------------------
%% Function: handle_cast(Msg, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% Description: Handling cast messages
%%--------------------------------------------------------------------
handle_cast({change_shaper, Shaper}, State) ->
NewShaperState = shaper:new(Shaper),
{noreply, State#state{shaper_state = NewShaperState}, ?HIBERNATE_TIMEOUT};
handle_cast(close, State) ->
{stop, normal, State};
handle_cast(_Msg, State) ->
{noreply, State, ?HIBERNATE_TIMEOUT}.
%%--------------------------------------------------------------------
%% Function: handle_info(Info, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% Description: Handling all non call/cast messages
%%--------------------------------------------------------------------
handle_info({Tag, _TCPSocket, Data},
#state{socket = Socket,
sock_mod = SockMod} = State)
when (Tag == tcp) or (Tag == ssl) or (Tag == ejabberd_xml) ->
case SockMod of
tls ->
case tls:recv_data(Socket, Data) of
{ok, TLSData} ->
{NextState, Hib} = process_data(TLSData, State),
{noreply, NextState, Hib};
{error, _Reason} ->
{stop, normal, State}
end;
ejabberd_zlib ->
case ejabberd_zlib:recv_data(Socket, Data) of
{ok, ZlibData} ->
{NextState, Hib} = process_data(ZlibData, State),
{noreply, NextState, Hib};
{error, _Reason} ->
{stop, normal, State}
end;
_ ->
{NextState, Hib} = process_data(Data, State),
{noreply, NextState, Hib}
end;
handle_info({Tag, _TCPSocket}, State)
when (Tag == tcp_closed) or (Tag == ssl_closed) ->
{stop, normal, State};
handle_info({Tag, _TCPSocket, Reason}, State)
when (Tag == tcp_error) or (Tag == ssl_error) ->
case Reason of
timeout ->
{noreply, State, ?HIBERNATE_TIMEOUT};
_ ->
{stop, normal, State}
end;
handle_info({'DOWN', _MRef, process, C2SPid, _},
#state{c2s_pid = C2SPid} = State) ->
{stop, normal, State};
handle_info({timeout, _Ref, activate}, State) ->
activate_socket(State),
{noreply, State, ?HIBERNATE_TIMEOUT};
handle_info(timeout, State) ->
{noreply, State, hibernate};
handle_info(_Info, State) ->
{noreply, State, ?HIBERNATE_TIMEOUT}.
%%--------------------------------------------------------------------
%% Function: terminate(Reason, State) -> void()
%% Description: This function is called by a gen_server when it is about to
%% terminate. It should be the opposite of Module:init/1 and do any necessary
%% cleaning up. When it returns, the gen_server terminates with Reason.
%% The return value is ignored.
%%--------------------------------------------------------------------
terminate(_Reason, #state{xml_stream_state = XMLStreamState,
c2s_pid = C2SPid} = State) ->
close_stream(XMLStreamState),
if
C2SPid /= undefined ->
gen_fsm:send_event(C2SPid, closed);
true ->
ok
end,
catch (State#state.sock_mod):close(State#state.socket),
ok.
%%--------------------------------------------------------------------
%% Func: code_change(OldVsn, State, Extra) -> {ok, NewState}
%% Description: Convert process state when code is changed
%%--------------------------------------------------------------------
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
activate_socket(#state{socket = Socket,
sock_mod = SockMod}) ->
PeerName =
case SockMod of
gen_tcp ->
inet:setopts(Socket, [{active, once}]),
inet:peername(Socket);
_ ->
SockMod:setopts(Socket, [{active, once}]),
SockMod:peername(Socket)
end,
case PeerName of
{error, _Reason} ->
self() ! {tcp_closed, Socket};
{ok, _} ->
ok
end.
deactivate_socket(#state{socket = Socket,
tref = TRef,
sock_mod = SockMod}) ->
cancel_timer(TRef),
case SockMod of
gen_tcp ->
inet:setopts(Socket, [{active, false}]);
_ ->
SockMod:setopts(Socket, [{active, false}])
end.
%% Data processing for connectors directly generating xmlel in
%% Erlang data structure.
%% WARNING: Shaper does not work with Erlang data structure.
process_data([], State) ->
activate_socket(State),
State;
process_data([Element|Els], #state{c2s_pid = C2SPid} = State)
when element(1, Element) == xmlel;
element(1, Element) == xmlstreamstart;
element(1, Element) == xmlstreamelement;
element(1, Element) == xmlstreamend ->
if
C2SPid == undefined ->
State;
true ->
catch gen_fsm:send_event(C2SPid, element_wrapper(Element)),
process_data(Els, State)
end;
%% Data processing for connectors receivind data as string.
process_data(Data,
#state{xml_stream_state = XMLStreamState,
tref = TRef,
shaper_state = ShaperState,
c2s_pid = C2SPid} = State) ->
?DEBUG("Received XML on stream = ~p", [Data]),
{ok, XMLStreamState1} = exmpp_xmlstream:parse(XMLStreamState, Data),
{NewShaperState, Pause} = shaper:update(ShaperState, size(Data)),
{NewTRef, HibTimeout} =
if
C2SPid == undefined ->
{TRef, infinity};
Pause > 0 ->
{erlang:start_timer(Pause, self(), activate), hibernate};
true ->
activate_socket(State),
{TRef, ?HIBERNATE_TIMEOUT}
end,
{State#state{xml_stream_state = XMLStreamState1,
tref = NewTRef,
shaper_state = NewShaperState}, HibTimeout}.
%% Element coming from XML parser are wrapped inside xmlstreamelement
%% When we receive directly xmlel tuple (from a socket module
%% speaking directly Erlang XML), we wrap it inside the same
%% xmlstreamelement coming from the XML parser.
element_wrapper(XmlEl)
when element(1, XmlEl) == xmlel ->
{xmlstreamelement, XmlEl};
element_wrapper(Element) ->
Element.
close_stream(undefined) ->
ok;
close_stream(XMLStreamState) ->
exmpp_xml:stop_parser(exmpp_xmlstream:get_parser(XMLStreamState)),
exmpp_xmlstream:stop(XMLStreamState).
do_send(State, Data) ->
(State#state.sock_mod):send(State#state.socket, Data).
cancel_timer(TRef) when is_reference(TRef) ->
case erlang:cancel_timer(TRef) of
false ->
receive
{timeout, TRef, _} ->
ok
after 0 ->
ok
end;
_ ->
ok
end;
cancel_timer(_) ->
ok.
do_reset_stream(#state{xml_stream_state = undefined, c2s_pid = C2SPid, max_stanza_size = MaxStanzaSize}) ->
new_xmlstream(C2SPid, MaxStanzaSize);
do_reset_stream(#state{xml_stream_state = XMLStreamState}) ->
exmpp_xmlstream:reset(XMLStreamState).
new_xmlstream(C2SPid, MaxStanzaSize) ->
Parser = exmpp_xml:start_parser([{names_as_atom, true},
{check_nss, xmpp},
{check_elems, xmpp},
{check_attrs, xmpp},
{max_size, MaxStanzaSize}
]),
exmpp_xmlstream:start({gen_fsm, C2SPid}, Parser,
[{xmlstreamstart, new}]
).
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