276 lines
8.8 KiB
Erlang
276 lines
8.8 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_c2s.erl
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%%% Author : Alexey Shchepin <alexey@sevcom.net>
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%%% Purpose :
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%%% Created : 16 Nov 2002 by Alexey Shchepin <alexey@sevcom.net>
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%%% Id : $Id$
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%%%----------------------------------------------------------------------
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-module(ejabberd_c2s).
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-author('alexey@sevcom.net').
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-vsn('$Revision$ ').
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-behaviour(gen_fsm).
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%% External exports
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-export([start/1, receiver/2, sender/1, send_text/2]).
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%% gen_fsm callbacks
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%-export([init/1, state_name/2, state_name/3, handle_event/3,
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% handle_sync_event/4, handle_info/3, terminate/3]).
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%
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-export([init/1, wait_for_stream/2, wait_for_auth/2, session_established/2,
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terminate/3]).
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-record(state, {socket, sender, receiver, streamid,
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user = "", server = "localhost", resource = ""}).
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-include("ejabberd.hrl").
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-define(DBGFSM, true).
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-ifdef(DBGFSM).
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-define(FSMOPTS, [{debug, [trace]}]).
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-else.
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-define(FSMOPTS, []).
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-endif.
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-define(STREAM_HEADER,
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"<?xml version='1.0'?>"
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"<stream:stream xmlns='jabber:client' "
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"xmlns:stream='http://etherx.jabber.org/streams' "
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"id='~s' from='~s'>"
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).
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-define(STREAM_TRAILER, "</stream:stream>").
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-define(INVALID_NS_ERR, "<stream:error>Invalid Namespace</stream:error>").
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%%%----------------------------------------------------------------------
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%%% API
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%%%----------------------------------------------------------------------
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start(Socket) ->
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gen_fsm:start(ejabberd_c2s, [Socket], ?FSMOPTS).
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%%%----------------------------------------------------------------------
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%%% Callback functions from gen_fsm
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%%%----------------------------------------------------------------------
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%%----------------------------------------------------------------------
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%% Func: init/1
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%% Returns: {ok, StateName, StateData} |
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%% {ok, StateName, StateData, Timeout} |
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%% ignore |
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%% {stop, StopReason}
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%%----------------------------------------------------------------------
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init([Socket]) ->
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SenderPid = spawn(?MODULE, sender, [Socket]),
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ReceiverPid = spawn(?MODULE, receiver, [Socket, self()]),
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{ok, wait_for_stream, #state{socket = Socket,
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receiver = ReceiverPid,
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sender = SenderPid,
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streamid = new_id()}}.
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%%----------------------------------------------------------------------
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%% Func: StateName/2
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData}
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%%----------------------------------------------------------------------
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state_name(Event, StateData) ->
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{next_state, state_name, StateData}.
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wait_for_stream({xmlstreamstart, Name, Attrs}, StateData) ->
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% TODO
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Header = io_lib:format(?STREAM_HEADER,
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[StateData#state.streamid, "localhost"]),
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send_text(StateData#state.sender, Header),
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case lists:keysearch("xmlns:stream", 1, Attrs) of
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{value, {"xmlns:stream", "http://etherx.jabber.org/streams"}} ->
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% TODO
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{next_state, wait_for_auth, StateData};
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_ ->
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send_text(StateData#state.sender, ?INVALID_NS_ERR ?STREAM_TRAILER),
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{stop, normal, StateData}
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end;
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wait_for_stream(closed, StateData) ->
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{stop, normal, StateData}.
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wait_for_auth({xmlstreamelement, El}, StateData) ->
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case is_auth_packet(El) of
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{auth, ID, {U, P, D, R}} ->
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io:format("AUTH: ~p~n", [{U, P, D, R}]),
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% TODO: digested password
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case ejabberd_auth:check_password(U, P) of
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true ->
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% TODO
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{next_state, session_established,
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StateData#state{user = U, resource = R}};
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_ ->
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Err = jlib:make_error_reply(El, "404", "Unauthorized"),
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send_element(StateData#state.sender, Err),
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{next_state, wait_for_auth, StateData}
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end;
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_ ->
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{next_state, wait_for_auth, StateData}
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end;
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wait_for_auth({xmlstreamend, Name}, StateData) ->
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% TODO
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{stop, normal, StateData};
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wait_for_auth(closed, StateData) ->
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{stop, normal, StateData}.
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session_established({xmlstreamelement, El}, StateData) ->
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{xmlelement, Name, Attrs, Els} = El,
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% TODO
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FromJID = {StateData#state.user, "localhost", StateData#state.resource},
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ToJID = jlib:string_to_jid(xml:get_attr_s("to", Attrs)),
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ejabberd_router:route(FromJID, ToJID, El),
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{next_state, session_established, StateData};
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session_established(closed, StateData) ->
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% TODO
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{stop, normal, StateData}.
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%%----------------------------------------------------------------------
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%% Func: StateName/3
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {reply, Reply, NextStateName, NextStateData} |
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%% {reply, Reply, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData} |
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%% {stop, Reason, Reply, NewStateData}
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%%----------------------------------------------------------------------
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state_name(Event, From, StateData) ->
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Reply = ok,
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{reply, Reply, state_name, StateData}.
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%%----------------------------------------------------------------------
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%% Func: handle_event/3
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData}
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%%----------------------------------------------------------------------
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handle_event(Event, StateName, StateData) ->
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{next_state, StateName, StateData}.
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%%----------------------------------------------------------------------
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%% Func: handle_sync_event/4
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {reply, Reply, NextStateName, NextStateData} |
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%% {reply, Reply, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData} |
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%% {stop, Reason, Reply, NewStateData}
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%%----------------------------------------------------------------------
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handle_sync_event(Event, From, StateName, StateData) ->
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Reply = ok,
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{reply, Reply, StateName, StateData}.
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%%----------------------------------------------------------------------
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%% Func: handle_info/3
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%% Returns: {next_state, NextStateName, NextStateData} |
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%% {next_state, NextStateName, NextStateData, Timeout} |
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%% {stop, Reason, NewStateData}
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%%----------------------------------------------------------------------
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handle_info(Info, StateName, StateData) ->
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{next_state, StateName, StateData}.
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%%----------------------------------------------------------------------
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%% Func: terminate/3
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%% Purpose: Shutdown the fsm
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%% Returns: any
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%%----------------------------------------------------------------------
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terminate(Reason, StateName, StateData) ->
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StateData#state.sender ! close,
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ok.
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%%%----------------------------------------------------------------------
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%%% Internal functions
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%%%----------------------------------------------------------------------
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receiver(Socket, C2SPid) ->
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XMLStreamPid = xml_stream:start(C2SPid),
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receiver(Socket, C2SPid, XMLStreamPid).
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receiver(Socket, C2SPid, XMLStreamPid) ->
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case gen_tcp:recv(Socket, 0) of
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{ok, Text} ->
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xml_stream:send_text(XMLStreamPid, Text),
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receiver(Socket, C2SPid, XMLStreamPid);
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{error, closed} ->
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exit(XMLStreamPid, closed),
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gen_fsm:send_event(C2SPid, closed),
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ok
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end.
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sender(Socket) ->
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receive
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{text, Text} ->
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gen_tcp:send(Socket,Text),
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sender(Socket);
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close ->
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gen_tcp:close(Socket),
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ok
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end.
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send_text(Pid, Text) ->
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Pid ! {text, Text}.
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send_element(Pid, El) ->
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send_text(Pid, xml:element_to_string(El)).
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new_id() ->
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lists:flatten(io_lib:format("~p", [random:uniform(65536*65536)])).
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is_auth_packet({xmlelement, Name, Attrs, Els}) when Name == "iq" ->
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case xml:get_attr_s("type", Attrs) of
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"set" ->
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case xml:remove_cdata(Els) of
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[{xmlelement, "query", Attrs2, Els2}] ->
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case xml:get_attr_s("xmlns", Attrs2) of
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"jabber:iq:auth" ->
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{auth,
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xml:get_attr_s("id", Attrs),
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get_auth_tags(Els2, "", "", "", "")};
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_ -> false
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end;
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_ ->
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false
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end;
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true ->
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false
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end;
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is_auth_packet(_) ->
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false.
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get_auth_tags([{xmlelement, Name, Attrs, Els}| L], U, P, D, R) ->
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CData = xml:get_cdata(Els),
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case Name of
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"username" ->
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get_auth_tags(L, CData, P, D, R);
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"password" ->
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get_auth_tags(L, U, CData, D, R);
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"digest" ->
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get_auth_tags(L, U, P, CData, R);
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"resource" ->
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get_auth_tags(L, U, P, D, CData);
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_ ->
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get_auth_tags(L, U, P, D, R)
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end;
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get_auth_tags([_ | L], U, P, D, R) ->
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get_auth_tags(L, U, P, D, R);
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get_auth_tags([], U, P, D, R) ->
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{U, P, D, R}.
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