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xmpp.chapril.org-ejabberd/src/ejabberd_c2s.erl
Alexey Shchepin b1e2538488 Update copyright dates
2012-02-23 17:52:34 +02:00

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%%%----------------------------------------------------------------------
%%% File : ejabberd_c2s.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Serve C2S connection
%%% Created : 16 Nov 2002 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2012 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_c2s).
-author('alexey@process-one.net').
-update_info({update, 0}).
-define(GEN_FSM, p1_fsm).
-behaviour(?GEN_FSM).
%% External exports
-export([start/2,
stop/1,
start_link/2,
send_text/2,
send_element/2,
socket_type/0,
get_presence/1,
get_aux_field/2,
set_aux_field/3,
del_aux_field/2,
get_subscription/2,
broadcast/4,
get_subscribed/1]).
%% gen_fsm callbacks
-export([init/1,
wait_for_stream/2,
wait_for_auth/2,
wait_for_feature_request/2,
wait_for_bind/2,
wait_for_session/2,
wait_for_sasl_response/2,
session_established/2,
handle_event/3,
handle_sync_event/4,
code_change/4,
handle_info/3,
terminate/3,
print_state/1
]).
-include("ejabberd.hrl").
-include("jlib.hrl").
-include("mod_privacy.hrl").
-define(SETS, gb_sets).
-define(DICT, dict).
%% pres_a contains all the presence available send (either through roster mechanism or directed).
%% Directed presence unavailable remove user from pres_a.
-record(state, {socket,
sockmod,
socket_monitor,
xml_socket,
streamid,
sasl_state,
access,
shaper,
zlib = false,
tls = false,
tls_required = false,
tls_enabled = false,
tls_options = [],
authenticated = false,
jid,
user = "", server = ?MYNAME, resource = "",
sid,
pres_t = ?SETS:new(),
pres_f = ?SETS:new(),
pres_a = ?SETS:new(),
pres_i = ?SETS:new(),
pres_last, pres_pri,
pres_timestamp,
pres_invis = false,
privacy_list = #userlist{},
conn = unknown,
auth_module = unknown,
ip,
aux_fields = [],
lang}).
%-define(DBGFSM, true).
-ifdef(DBGFSM).
-define(FSMOPTS, [{debug, [trace]}]).
-else.
-define(FSMOPTS, []).
-endif.
%% Module start with or without supervisor:
-ifdef(NO_TRANSIENT_SUPERVISORS).
-define(SUPERVISOR_START, ?GEN_FSM:start(ejabberd_c2s, [SockData, Opts],
fsm_limit_opts(Opts) ++ ?FSMOPTS)).
-else.
-define(SUPERVISOR_START, supervisor:start_child(ejabberd_c2s_sup,
[SockData, Opts])).
-endif.
%% This is the timeout to apply between event when starting a new
%% session:
-define(C2S_OPEN_TIMEOUT, 60000).
-define(C2S_HIBERNATE_TIMEOUT, 90000).
-define(STREAM_HEADER,
"<?xml version='1.0'?>"
"<stream:stream xmlns='jabber:client' "
"xmlns:stream='http://etherx.jabber.org/streams' "
"id='~s' from='~s'~s~s>"
).
-define(STREAM_TRAILER, "</stream:stream>").
-define(INVALID_NS_ERR, ?SERR_INVALID_NAMESPACE).
-define(INVALID_XML_ERR, ?SERR_XML_NOT_WELL_FORMED).
-define(HOST_UNKNOWN_ERR, ?SERR_HOST_UNKNOWN).
-define(POLICY_VIOLATION_ERR(Lang, Text),
?SERRT_POLICY_VIOLATION(Lang, Text)).
-define(INVALID_FROM, ?SERR_INVALID_FROM).
%%%----------------------------------------------------------------------
%%% API
%%%----------------------------------------------------------------------
start(SockData, Opts) ->
?SUPERVISOR_START.
start_link(SockData, Opts) ->
?GEN_FSM:start_link(ejabberd_c2s, [SockData, Opts],
fsm_limit_opts(Opts) ++ ?FSMOPTS).
socket_type() ->
xml_stream.
%% Return Username, Resource and presence information
get_presence(FsmRef) ->
?GEN_FSM:sync_send_all_state_event(FsmRef, {get_presence}, 1000).
get_aux_field(Key, #state{aux_fields = Opts}) ->
case lists:keysearch(Key, 1, Opts) of
{value, {_, Val}} ->
{ok, Val};
_ ->
error
end.
set_aux_field(Key, Val, #state{aux_fields = Opts} = State) ->
Opts1 = lists:keydelete(Key, 1, Opts),
State#state{aux_fields = [{Key, Val}|Opts1]}.
del_aux_field(Key, #state{aux_fields = Opts} = State) ->
Opts1 = lists:keydelete(Key, 1, Opts),
State#state{aux_fields = Opts1}.
get_subscription(From = #jid{}, StateData) ->
get_subscription(jlib:jid_tolower(From), StateData);
get_subscription(LFrom, StateData) ->
LBFrom = setelement(3, LFrom, ""),
F = ?SETS:is_element(LFrom, StateData#state.pres_f) orelse
?SETS:is_element(LBFrom, StateData#state.pres_f),
T = ?SETS:is_element(LFrom, StateData#state.pres_t) orelse
?SETS:is_element(LBFrom, StateData#state.pres_t),
if F and T -> both;
F -> from;
T -> to;
true -> none
end.
broadcast(FsmRef, Type, From, Packet) ->
FsmRef ! {broadcast, Type, From, Packet}.
stop(FsmRef) ->
?GEN_FSM:send_event(FsmRef, closed).
%%%----------------------------------------------------------------------
%%% Callback functions from gen_fsm
%%%----------------------------------------------------------------------
%%----------------------------------------------------------------------
%% Func: init/1
%% Returns: {ok, StateName, StateData} |
%% {ok, StateName, StateData, Timeout} |
%% ignore |
%% {stop, StopReason}
%%----------------------------------------------------------------------
init([{SockMod, Socket}, Opts]) ->
Access = case lists:keysearch(access, 1, Opts) of
{value, {_, A}} -> A;
_ -> all
end,
Shaper = case lists:keysearch(shaper, 1, Opts) of
{value, {_, S}} -> S;
_ -> none
end,
XMLSocket =
case lists:keysearch(xml_socket, 1, Opts) of
{value, {_, XS}} -> XS;
_ -> false
end,
Zlib = lists:member(zlib, Opts),
StartTLS = lists:member(starttls, Opts),
StartTLSRequired = lists:member(starttls_required, Opts),
TLSEnabled = lists:member(tls, Opts),
TLS = StartTLS orelse StartTLSRequired orelse TLSEnabled,
TLSOpts1 =
lists:filter(fun({certfile, _}) -> true;
(_) -> false
end, Opts),
TLSOpts = [verify_none | TLSOpts1],
IP = peerip(SockMod, Socket),
%% Check if IP is blacklisted:
case is_ip_blacklisted(IP) of
true ->
?INFO_MSG("Connection attempt from blacklisted IP: ~s (~w)",
[jlib:ip_to_list(IP), IP]),
{stop, normal};
false ->
Socket1 =
if
TLSEnabled ->
SockMod:starttls(Socket, TLSOpts);
true ->
Socket
end,
SocketMonitor = SockMod:monitor(Socket1),
{ok, wait_for_stream, #state{socket = Socket1,
sockmod = SockMod,
socket_monitor = SocketMonitor,
xml_socket = XMLSocket,
zlib = Zlib,
tls = TLS,
tls_required = StartTLSRequired,
tls_enabled = TLSEnabled,
tls_options = TLSOpts,
streamid = new_id(),
access = Access,
shaper = Shaper,
ip = IP},
?C2S_OPEN_TIMEOUT}
end.
%% Return list of all available resources of contacts,
get_subscribed(FsmRef) ->
?GEN_FSM:sync_send_all_state_event(FsmRef, get_subscribed, 1000).
%%----------------------------------------------------------------------
%% Func: StateName/2
%% Returns: {next_state, NextStateName, NextStateData} |
%% {next_state, NextStateName, NextStateData, Timeout} |
%% {stop, Reason, NewStateData}
%%----------------------------------------------------------------------
wait_for_stream({xmlstreamstart, _Name, Attrs}, StateData) ->
DefaultLang = case ?MYLANG of
undefined ->
"en";
DL ->
DL
end,
case xml:get_attr_s("xmlns:stream", Attrs) of
?NS_STREAM ->
Server = jlib:nameprep(xml:get_attr_s("to", Attrs)),
case lists:member(Server, ?MYHOSTS) of
true ->
Lang = case xml:get_attr_s("xml:lang", Attrs) of
Lang1 when length(Lang1) =< 35 ->
%% As stated in BCP47, 4.4.1:
%% Protocols or specifications that
%% specify limited buffer sizes for
%% language tags MUST allow for
%% language tags of at least 35 characters.
Lang1;
_ ->
%% Do not store long language tag to
%% avoid possible DoS/flood attacks
""
end,
change_shaper(StateData, jlib:make_jid("", Server, "")),
case xml:get_attr_s("version", Attrs) of
"1.0" ->
send_header(StateData, Server, "1.0", DefaultLang),
case StateData#state.authenticated of
false ->
SASLState =
cyrsasl:server_new(
"jabber", Server, "", [],
fun(U) ->
ejabberd_auth:get_password_with_authmodule(
U, Server)
end,
fun(U, P) ->
ejabberd_auth:check_password_with_authmodule(
U, Server, P)
end,
fun(U, P, D, DG) ->
ejabberd_auth:check_password_with_authmodule(
U, Server, P, D, DG)
end),
Mechs = lists:map(
fun(S) ->
{xmlelement, "mechanism", [],
[{xmlcdata, S}]}
end, cyrsasl:listmech(Server)),
SockMod =
(StateData#state.sockmod):get_sockmod(
StateData#state.socket),
Zlib = StateData#state.zlib,
CompressFeature =
case Zlib andalso
((SockMod == gen_tcp) orelse
(SockMod == tls)) of
true ->
[{xmlelement, "compression",
[{"xmlns", ?NS_FEATURE_COMPRESS}],
[{xmlelement, "method",
[], [{xmlcdata, "zlib"}]}]}];
_ ->
[]
end,
TLS = StateData#state.tls,
TLSEnabled = StateData#state.tls_enabled,
TLSRequired = StateData#state.tls_required,
TLSFeature =
case (TLS == true) andalso
(TLSEnabled == false) andalso
(SockMod == gen_tcp) of
true ->
case TLSRequired of
true ->
[{xmlelement, "starttls",
[{"xmlns", ?NS_TLS}],
[{xmlelement, "required",
[], []}]}];
_ ->
[{xmlelement, "starttls",
[{"xmlns", ?NS_TLS}], []}]
end;
false ->
[]
end,
send_element(StateData,
{xmlelement, "stream:features", [],
TLSFeature ++ CompressFeature ++
[{xmlelement, "mechanisms",
[{"xmlns", ?NS_SASL}],
Mechs}] ++
ejabberd_hooks:run_fold(
c2s_stream_features,
Server,
[], [Server])}),
fsm_next_state(wait_for_feature_request,
StateData#state{
server = Server,
sasl_state = SASLState,
lang = Lang});
_ ->
case StateData#state.resource of
"" ->
RosterVersioningFeature =
ejabberd_hooks:run_fold(
roster_get_versioning_feature,
Server, [], [Server]),
StreamFeatures =
[{xmlelement, "bind",
[{"xmlns", ?NS_BIND}], []},
{xmlelement, "session",
[{"xmlns", ?NS_SESSION}], []}]
++ RosterVersioningFeature
++ ejabberd_hooks:run_fold(
c2s_stream_features,
Server,
[], [Server]),
send_element(
StateData,
{xmlelement, "stream:features", [],
StreamFeatures}),
fsm_next_state(wait_for_bind,
StateData#state{
server = Server,
lang = Lang});
_ ->
send_element(
StateData,
{xmlelement, "stream:features", [], []}),
fsm_next_state(wait_for_session,
StateData#state{
server = Server,
lang = Lang})
end
end;
_ ->
send_header(StateData, Server, "", DefaultLang),
if
(not StateData#state.tls_enabled) and
StateData#state.tls_required ->
send_element(
StateData,
?POLICY_VIOLATION_ERR(
Lang,
"Use of STARTTLS required")),
send_trailer(StateData),
{stop, normal, StateData};
true ->
fsm_next_state(wait_for_auth,
StateData#state{
server = Server,
lang = Lang})
end
end;
_ ->
send_header(StateData, ?MYNAME, "", DefaultLang),
send_element(StateData, ?HOST_UNKNOWN_ERR),
send_trailer(StateData),
{stop, normal, StateData}
end;
_ ->
send_header(StateData, ?MYNAME, "", DefaultLang),
send_element(StateData, ?INVALID_NS_ERR),
send_trailer(StateData),
{stop, normal, StateData}
end;
wait_for_stream(timeout, StateData) ->
{stop, normal, StateData};
wait_for_stream({xmlstreamelement, _}, StateData) ->
send_element(StateData, ?INVALID_XML_ERR),
send_trailer(StateData),
{stop, normal, StateData};
wait_for_stream({xmlstreamend, _}, StateData) ->
send_element(StateData, ?INVALID_XML_ERR),
send_trailer(StateData),
{stop, normal, StateData};
wait_for_stream({xmlstreamerror, _}, StateData) ->
send_header(StateData, ?MYNAME, "1.0", ""),
send_element(StateData, ?INVALID_XML_ERR),
send_trailer(StateData),
{stop, normal, StateData};
wait_for_stream(closed, StateData) ->
{stop, normal, StateData}.
wait_for_auth({xmlstreamelement, El}, StateData) ->
case is_auth_packet(El) of
{auth, _ID, get, {U, _, _, _}} ->
{xmlelement, Name, Attrs, _Els} = jlib:make_result_iq_reply(El),
case U of
"" ->
UCdata = [];
_ ->
UCdata = [{xmlcdata, U}]
end,
Res = case ejabberd_auth:plain_password_required(
StateData#state.server) of
false ->
{xmlelement, Name, Attrs,
[{xmlelement, "query", [{"xmlns", ?NS_AUTH}],
[{xmlelement, "username", [], UCdata},
{xmlelement, "password", [], []},
{xmlelement, "digest", [], []},
{xmlelement, "resource", [], []}
]}]};
true ->
{xmlelement, Name, Attrs,
[{xmlelement, "query", [{"xmlns", ?NS_AUTH}],
[{xmlelement, "username", [], UCdata},
{xmlelement, "password", [], []},
{xmlelement, "resource", [], []}
]}]}
end,
send_element(StateData, Res),
fsm_next_state(wait_for_auth, StateData);
{auth, _ID, set, {_U, _P, _D, ""}} ->
Err = jlib:make_error_reply(
El,
?ERR_AUTH_NO_RESOURCE_PROVIDED(StateData#state.lang)),
send_element(StateData, Err),
fsm_next_state(wait_for_auth, StateData);
{auth, _ID, set, {U, P, D, R}} ->
JID = jlib:make_jid(U, StateData#state.server, R),
case (JID /= error) andalso
(acl:match_rule(StateData#state.server,
StateData#state.access, JID) == allow) of
true ->
DGen = fun(PW) ->
sha:sha(StateData#state.streamid ++ PW) end,
case ejabberd_auth:check_password_with_authmodule(
U, StateData#state.server, P, D, DGen) of
{true, AuthModule} ->
?INFO_MSG(
"(~w) Accepted legacy authentication for ~s by ~p",
[StateData#state.socket,
jlib:jid_to_string(JID), AuthModule]),
SID = {now(), self()},
Conn = get_conn_type(StateData),
Info = [{ip, StateData#state.ip}, {conn, Conn},
{auth_module, AuthModule}],
Res1 = jlib:make_result_iq_reply(El),
Res = setelement(4, Res1, []),
send_element(StateData, Res),
ejabberd_sm:open_session(
SID, U, StateData#state.server, R, Info),
change_shaper(StateData, JID),
{Fs, Ts} = ejabberd_hooks:run_fold(
roster_get_subscription_lists,
StateData#state.server,
{[], []},
[U, StateData#state.server]),
LJID = jlib:jid_tolower(
jlib:jid_remove_resource(JID)),
Fs1 = [LJID | Fs],
Ts1 = [LJID | Ts],
PrivList =
ejabberd_hooks:run_fold(
privacy_get_user_list, StateData#state.server,
#userlist{},
[U, StateData#state.server]),
NewStateData =
StateData#state{
user = U,
resource = R,
jid = JID,
sid = SID,
conn = Conn,
auth_module = AuthModule,
pres_f = ?SETS:from_list(Fs1),
pres_t = ?SETS:from_list(Ts1),
privacy_list = PrivList},
fsm_next_state_pack(session_established,
NewStateData);
_ ->
?INFO_MSG(
"(~w) Failed legacy authentication for ~s",
[StateData#state.socket,
jlib:jid_to_string(JID)]),
Err = jlib:make_error_reply(
El, ?ERR_NOT_AUTHORIZED),
send_element(StateData, Err),
fsm_next_state(wait_for_auth, StateData)
end;
_ ->
if
JID == error ->
?INFO_MSG(
"(~w) Forbidden legacy authentication for "
"username '~s' with resource '~s'",
[StateData#state.socket, U, R]),
Err = jlib:make_error_reply(El, ?ERR_JID_MALFORMED),
send_element(StateData, Err),
fsm_next_state(wait_for_auth, StateData);
true ->
?INFO_MSG(
"(~w) Forbidden legacy authentication for ~s",
[StateData#state.socket,
jlib:jid_to_string(JID)]),
Err = jlib:make_error_reply(El, ?ERR_NOT_ALLOWED),
send_element(StateData, Err),
fsm_next_state(wait_for_auth, StateData)
end
end;
_ ->
process_unauthenticated_stanza(StateData, El),
fsm_next_state(wait_for_auth, StateData)
end;
wait_for_auth(timeout, StateData) ->
{stop, normal, StateData};
wait_for_auth({xmlstreamend, _Name}, StateData) ->
send_trailer(StateData),
{stop, normal, StateData};
wait_for_auth({xmlstreamerror, _}, StateData) ->
send_element(StateData, ?INVALID_XML_ERR),
send_trailer(StateData),
{stop, normal, StateData};
wait_for_auth(closed, StateData) ->
{stop, normal, StateData}.
wait_for_feature_request({xmlstreamelement, El}, StateData) ->
{xmlelement, Name, Attrs, Els} = El,
Zlib = StateData#state.zlib,
TLS = StateData#state.tls,
TLSEnabled = StateData#state.tls_enabled,
TLSRequired = StateData#state.tls_required,
SockMod = (StateData#state.sockmod):get_sockmod(StateData#state.socket),
case {xml:get_attr_s("xmlns", Attrs), Name} of
{?NS_SASL, "auth"} when not ((SockMod == gen_tcp) and TLSRequired) ->
Mech = xml:get_attr_s("mechanism", Attrs),
ClientIn = jlib:decode_base64(xml:get_cdata(Els)),
case cyrsasl:server_start(StateData#state.sasl_state,
Mech,
ClientIn) of
{ok, Props} ->
(StateData#state.sockmod):reset_stream(
StateData#state.socket),
send_element(StateData,
{xmlelement, "success",
[{"xmlns", ?NS_SASL}], []}),
U = xml:get_attr_s(username, Props),
AuthModule = xml:get_attr_s(auth_module, Props),
?INFO_MSG("(~w) Accepted authentication for ~s by ~p",
[StateData#state.socket, U, AuthModule]),
fsm_next_state(wait_for_stream,
StateData#state{
streamid = new_id(),
authenticated = true,
auth_module = AuthModule,
user = U });
{continue, ServerOut, NewSASLState} ->
send_element(StateData,
{xmlelement, "challenge",
[{"xmlns", ?NS_SASL}],
[{xmlcdata,
jlib:encode_base64(ServerOut)}]}),
fsm_next_state(wait_for_sasl_response,
StateData#state{
sasl_state = NewSASLState});
{error, Error, Username} ->
?INFO_MSG(
"(~w) Failed authentication for ~s@~s",
[StateData#state.socket,
Username, StateData#state.server]),
send_element(StateData,
{xmlelement, "failure",
[{"xmlns", ?NS_SASL}],
[{xmlelement, Error, [], []}]}),
{next_state, wait_for_feature_request, StateData,
?C2S_OPEN_TIMEOUT};
{error, Error} ->
send_element(StateData,
{xmlelement, "failure",
[{"xmlns", ?NS_SASL}],
[{xmlelement, Error, [], []}]}),
fsm_next_state(wait_for_feature_request, StateData)
end;
{?NS_TLS, "starttls"} when TLS == true,
TLSEnabled == false,
SockMod == gen_tcp ->
TLSOpts = case ejabberd_config:get_local_option(
{domain_certfile, StateData#state.server}) of
undefined ->
StateData#state.tls_options;
CertFile ->
[{certfile, CertFile} |
lists:keydelete(
certfile, 1, StateData#state.tls_options)]
end,
Socket = StateData#state.socket,
TLSSocket = (StateData#state.sockmod):starttls(
Socket, TLSOpts,
xml:element_to_binary(
{xmlelement, "proceed", [{"xmlns", ?NS_TLS}], []})),
fsm_next_state(wait_for_stream,
StateData#state{socket = TLSSocket,
streamid = new_id(),
tls_enabled = true
});
{?NS_COMPRESS, "compress"} when Zlib == true,
((SockMod == gen_tcp) or
(SockMod == tls)) ->
case xml:get_subtag(El, "method") of
false ->
send_element(StateData,
{xmlelement, "failure",
[{"xmlns", ?NS_COMPRESS}],
[{xmlelement, "setup-failed", [], []}]}),
fsm_next_state(wait_for_feature_request, StateData);
Method ->
case xml:get_tag_cdata(Method) of
"zlib" ->
Socket = StateData#state.socket,
ZlibSocket = (StateData#state.sockmod):compress(
Socket,
xml:element_to_binary(
{xmlelement, "compressed",
[{"xmlns", ?NS_COMPRESS}], []})),
fsm_next_state(wait_for_stream,
StateData#state{socket = ZlibSocket,
streamid = new_id()
});
_ ->
send_element(StateData,
{xmlelement, "failure",
[{"xmlns", ?NS_COMPRESS}],
[{xmlelement, "unsupported-method",
[], []}]}),
fsm_next_state(wait_for_feature_request,
StateData)
end
end;
_ ->
if
(SockMod == gen_tcp) and TLSRequired ->
Lang = StateData#state.lang,
send_element(StateData, ?POLICY_VIOLATION_ERR(
Lang,
"Use of STARTTLS required")),
send_trailer(StateData),
{stop, normal, StateData};
true ->
process_unauthenticated_stanza(StateData, El),
fsm_next_state(wait_for_feature_request, StateData)
end
end;
wait_for_feature_request(timeout, StateData) ->
{stop, normal, StateData};
wait_for_feature_request({xmlstreamend, _Name}, StateData) ->
send_trailer(StateData),
{stop, normal, StateData};
wait_for_feature_request({xmlstreamerror, _}, StateData) ->
send_element(StateData, ?INVALID_XML_ERR),
send_trailer(StateData),
{stop, normal, StateData};
wait_for_feature_request(closed, StateData) ->
{stop, normal, StateData}.
wait_for_sasl_response({xmlstreamelement, El}, StateData) ->
{xmlelement, Name, Attrs, Els} = El,
case {xml:get_attr_s("xmlns", Attrs), Name} of
{?NS_SASL, "response"} ->
ClientIn = jlib:decode_base64(xml:get_cdata(Els)),
case cyrsasl:server_step(StateData#state.sasl_state,
ClientIn) of
{ok, Props} ->
(StateData#state.sockmod):reset_stream(
StateData#state.socket),
send_element(StateData,
{xmlelement, "success",
[{"xmlns", ?NS_SASL}], []}),
U = xml:get_attr_s(username, Props),
AuthModule = xml:get_attr_s(auth_module, Props),
?INFO_MSG("(~w) Accepted authentication for ~s by ~p",
[StateData#state.socket, U, AuthModule]),
fsm_next_state(wait_for_stream,
StateData#state{
streamid = new_id(),
authenticated = true,
auth_module = AuthModule,
user = U});
{ok, Props, ServerOut} ->
(StateData#state.sockmod):reset_stream(
StateData#state.socket),
send_element(StateData,
{xmlelement, "success",
[{"xmlns", ?NS_SASL}],
[{xmlcdata,
jlib:encode_base64(ServerOut)}]}),
U = xml:get_attr_s(username, Props),
AuthModule = xml:get_attr_s(auth_module, Props),
?INFO_MSG("(~w) Accepted authentication for ~s by ~p",
[StateData#state.socket, U, AuthModule]),
fsm_next_state(wait_for_stream,
StateData#state{
streamid = new_id(),
authenticated = true,
auth_module = AuthModule,
user = U});
{continue, ServerOut, NewSASLState} ->
send_element(StateData,
{xmlelement, "challenge",
[{"xmlns", ?NS_SASL}],
[{xmlcdata,
jlib:encode_base64(ServerOut)}]}),
fsm_next_state(wait_for_sasl_response,
StateData#state{sasl_state = NewSASLState});
{error, Error, Username} ->
?INFO_MSG(
"(~w) Failed authentication for ~s@~s",
[StateData#state.socket,
Username, StateData#state.server]),
send_element(StateData,
{xmlelement, "failure",
[{"xmlns", ?NS_SASL}],
[{xmlelement, Error, [], []}]}),
fsm_next_state(wait_for_feature_request, StateData);
{error, Error} ->
send_element(StateData,
{xmlelement, "failure",
[{"xmlns", ?NS_SASL}],
[{xmlelement, Error, [], []}]}),
fsm_next_state(wait_for_feature_request, StateData)
end;
_ ->
process_unauthenticated_stanza(StateData, El),
fsm_next_state(wait_for_feature_request, StateData)
end;
wait_for_sasl_response(timeout, StateData) ->
{stop, normal, StateData};
wait_for_sasl_response({xmlstreamend, _Name}, StateData) ->
send_trailer(StateData),
{stop, normal, StateData};
wait_for_sasl_response({xmlstreamerror, _}, StateData) ->
send_element(StateData, ?INVALID_XML_ERR),
send_trailer(StateData),
{stop, normal, StateData};
wait_for_sasl_response(closed, StateData) ->
{stop, normal, StateData}.
resource_conflict_action(U, S, R) ->
OptionRaw = case ejabberd_sm:is_existing_resource(U, S, R) of
true ->
ejabberd_config:get_local_option({resource_conflict,S});
false ->
acceptnew
end,
Option = case OptionRaw of
setresource -> setresource;
closeold -> acceptnew; %% ejabberd_sm will close old session
closenew -> closenew;
acceptnew -> acceptnew;
_ -> acceptnew %% default ejabberd behavior
end,
case Option of
acceptnew ->
{accept_resource, R};
closenew ->
closenew;
setresource ->
Rnew = lists:concat([randoms:get_string() | tuple_to_list(now())]),
{accept_resource, Rnew}
end.
wait_for_bind({xmlstreamelement, El}, StateData) ->
case jlib:iq_query_info(El) of
#iq{type = set, xmlns = ?NS_BIND, sub_el = SubEl} = IQ ->
U = StateData#state.user,
R1 = xml:get_path_s(SubEl, [{elem, "resource"}, cdata]),
R = case jlib:resourceprep(R1) of
error -> error;
"" ->
lists:concat(
[randoms:get_string() | tuple_to_list(now())]);
Resource -> Resource
end,
case R of
error ->
Err = jlib:make_error_reply(El, ?ERR_BAD_REQUEST),
send_element(StateData, Err),
fsm_next_state(wait_for_bind, StateData);
_ ->
%%Server = StateData#state.server,
%%RosterVersioningFeature =
%% ejabberd_hooks:run_fold(
%% roster_get_versioning_feature, Server, [], [Server]),
%%StreamFeatures = [{xmlelement, "session",
%% [{"xmlns", ?NS_SESSION}], []} |
%% RosterVersioningFeature],
%%send_element(StateData, {xmlelement, "stream:features",
%% [], StreamFeatures}),
case resource_conflict_action(U, StateData#state.server, R) of
closenew ->
Err = jlib:make_error_reply(El, ?STANZA_ERROR("409", "modify", "conflict")),
send_element(StateData, Err),
fsm_next_state(wait_for_bind, StateData);
{accept_resource, R2} ->
JID = jlib:make_jid(U, StateData#state.server, R2),
Res = IQ#iq{type = result,
sub_el = [{xmlelement, "bind",
[{"xmlns", ?NS_BIND}],
[{xmlelement, "jid", [],
[{xmlcdata,
jlib:jid_to_string(JID)}]}]}]},
send_element(StateData, jlib:iq_to_xml(Res)),
fsm_next_state(wait_for_session,
StateData#state{resource = R2, jid = JID})
end
end;
_ ->
fsm_next_state(wait_for_bind, StateData)
end;
wait_for_bind(timeout, StateData) ->
{stop, normal, StateData};
wait_for_bind({xmlstreamend, _Name}, StateData) ->
send_trailer(StateData),
{stop, normal, StateData};
wait_for_bind({xmlstreamerror, _}, StateData) ->
send_element(StateData, ?INVALID_XML_ERR),
send_trailer(StateData),
{stop, normal, StateData};
wait_for_bind(closed, StateData) ->
{stop, normal, StateData}.
wait_for_session({xmlstreamelement, El}, StateData) ->
case jlib:iq_query_info(El) of
#iq{type = set, xmlns = ?NS_SESSION} ->
U = StateData#state.user,
R = StateData#state.resource,
JID = StateData#state.jid,
case acl:match_rule(StateData#state.server,
StateData#state.access, JID) of
allow ->
?INFO_MSG("(~w) Opened session for ~s",
[StateData#state.socket,
jlib:jid_to_string(JID)]),
Res = jlib:make_result_iq_reply(El),
send_element(StateData, Res),
change_shaper(StateData, JID),
{Fs, Ts} = ejabberd_hooks:run_fold(
roster_get_subscription_lists,
StateData#state.server,
{[], []},
[U, StateData#state.server]),
LJID = jlib:jid_tolower(jlib:jid_remove_resource(JID)),
Fs1 = [LJID | Fs],
Ts1 = [LJID | Ts],
PrivList =
ejabberd_hooks:run_fold(
privacy_get_user_list, StateData#state.server,
#userlist{},
[U, StateData#state.server]),
SID = {now(), self()},
Conn = get_conn_type(StateData),
Info = [{ip, StateData#state.ip}, {conn, Conn},
{auth_module, StateData#state.auth_module}],
ejabberd_sm:open_session(
SID, U, StateData#state.server, R, Info),
NewStateData =
StateData#state{
sid = SID,
conn = Conn,
pres_f = ?SETS:from_list(Fs1),
pres_t = ?SETS:from_list(Ts1),
privacy_list = PrivList},
fsm_next_state_pack(session_established,
NewStateData);
_ ->
ejabberd_hooks:run(forbidden_session_hook,
StateData#state.server, [JID]),
?INFO_MSG("(~w) Forbidden session for ~s",
[StateData#state.socket,
jlib:jid_to_string(JID)]),
Err = jlib:make_error_reply(El, ?ERR_NOT_ALLOWED),
send_element(StateData, Err),
fsm_next_state(wait_for_session, StateData)
end;
_ ->
fsm_next_state(wait_for_session, StateData)
end;
wait_for_session(timeout, StateData) ->
{stop, normal, StateData};
wait_for_session({xmlstreamend, _Name}, StateData) ->
send_trailer(StateData),
{stop, normal, StateData};
wait_for_session({xmlstreamerror, _}, StateData) ->
send_element(StateData, ?INVALID_XML_ERR),
send_trailer(StateData),
{stop, normal, StateData};
wait_for_session(closed, StateData) ->
{stop, normal, StateData}.
session_established({xmlstreamelement, El}, StateData) ->
FromJID = StateData#state.jid,
% Check 'from' attribute in stanza RFC 3920 Section 9.1.2
case check_from(El, FromJID) of
'invalid-from' ->
send_element(StateData, ?INVALID_FROM),
send_trailer(StateData),
{stop, normal, StateData};
_NewEl ->
session_established2(El, StateData)
end;
%% We hibernate the process to reduce memory consumption after a
%% configurable activity timeout
session_established(timeout, StateData) ->
%% TODO: Options must be stored in state:
Options = [],
proc_lib:hibernate(?GEN_FSM, enter_loop,
[?MODULE, Options, session_established, StateData]),
fsm_next_state(session_established, StateData);
session_established({xmlstreamend, _Name}, StateData) ->
send_trailer(StateData),
{stop, normal, StateData};
session_established({xmlstreamerror, "XML stanza is too big" = E}, StateData) ->
send_element(StateData, ?POLICY_VIOLATION_ERR(StateData#state.lang, E)),
send_trailer(StateData),
{stop, normal, StateData};
session_established({xmlstreamerror, _}, StateData) ->
send_element(StateData, ?INVALID_XML_ERR),
send_trailer(StateData),
{stop, normal, StateData};
session_established(closed, StateData) ->
{stop, normal, StateData}.
%% Process packets sent by user (coming from user on c2s XMPP
%% connection)
session_established2(El, StateData) ->
{xmlelement, Name, Attrs, _Els} = El,
User = StateData#state.user,
Server = StateData#state.server,
FromJID = StateData#state.jid,
To = xml:get_attr_s("to", Attrs),
ToJID = case To of
"" ->
jlib:make_jid(User, Server, "");
_ ->
jlib:string_to_jid(To)
end,
NewEl1 = jlib:remove_attr("xmlns", El),
NewEl = case xml:get_attr_s("xml:lang", Attrs) of
"" ->
case StateData#state.lang of
"" -> NewEl1;
Lang ->
xml:replace_tag_attr("xml:lang", Lang, NewEl1)
end;
_ ->
NewEl1
end,
NewState =
case ToJID of
error ->
case xml:get_attr_s("type", Attrs) of
"error" -> StateData;
"result" -> StateData;
_ ->
Err = jlib:make_error_reply(NewEl, ?ERR_JID_MALFORMED),
send_element(StateData, Err),
StateData
end;
_ ->
case Name of
"presence" ->
PresenceEl = ejabberd_hooks:run_fold(
c2s_update_presence,
Server,
NewEl,
[User, Server]),
ejabberd_hooks:run(
user_send_packet,
Server,
[FromJID, ToJID, PresenceEl]),
case ToJID of
#jid{user = User,
server = Server,
resource = ""} ->
?DEBUG("presence_update(~p,~n\t~p,~n\t~p)",
[FromJID, PresenceEl, StateData]),
presence_update(FromJID, PresenceEl,
StateData);
_ ->
presence_track(FromJID, ToJID, PresenceEl,
StateData)
end;
"iq" ->
case jlib:iq_query_info(NewEl) of
#iq{xmlns = Xmlns} = IQ
when Xmlns == ?NS_PRIVACY;
Xmlns == ?NS_BLOCKING ->
process_privacy_iq(
FromJID, ToJID, IQ, StateData);
_ ->
ejabberd_hooks:run(
user_send_packet,
Server,
[FromJID, ToJID, NewEl]),
check_privacy_route(FromJID, StateData, FromJID, ToJID, NewEl),
StateData
end;
"message" ->
ejabberd_hooks:run(user_send_packet,
Server,
[FromJID, ToJID, NewEl]),
check_privacy_route(FromJID, StateData, FromJID,
ToJID, NewEl),
StateData;
_ ->
StateData
end
end,
ejabberd_hooks:run(c2s_loop_debug, [{xmlstreamelement, El}]),
fsm_next_state(session_established, NewState).
%%----------------------------------------------------------------------
%% Func: StateName/3
%% Returns: {next_state, NextStateName, NextStateData} |
%% {next_state, NextStateName, NextStateData, Timeout} |
%% {reply, Reply, NextStateName, NextStateData} |
%% {reply, Reply, NextStateName, NextStateData, Timeout} |
%% {stop, Reason, NewStateData} |
%% {stop, Reason, Reply, NewStateData}
%%----------------------------------------------------------------------
%state_name(Event, From, StateData) ->
% Reply = ok,
% {reply, Reply, state_name, StateData}.
%%----------------------------------------------------------------------
%% Func: handle_event/3
%% Returns: {next_state, NextStateName, NextStateData} |
%% {next_state, NextStateName, NextStateData, Timeout} |
%% {stop, Reason, NewStateData}
%%----------------------------------------------------------------------
handle_event(_Event, StateName, StateData) ->
fsm_next_state(StateName, StateData).
%%----------------------------------------------------------------------
%% Func: handle_sync_event/4
%% Returns: {next_state, NextStateName, NextStateData} |
%% {next_state, NextStateName, NextStateData, Timeout} |
%% {reply, Reply, NextStateName, NextStateData} |
%% {reply, Reply, NextStateName, NextStateData, Timeout} |
%% {stop, Reason, NewStateData} |
%% {stop, Reason, Reply, NewStateData}
%%----------------------------------------------------------------------
handle_sync_event({get_presence}, _From, StateName, StateData) ->
User = StateData#state.user,
PresLast = StateData#state.pres_last,
Show = get_showtag(PresLast),
Status = get_statustag(PresLast),
Resource = StateData#state.resource,
Reply = {User, Resource, Show, Status},
fsm_reply(Reply, StateName, StateData);
handle_sync_event(get_subscribed, _From, StateName, StateData) ->
Subscribed = ?SETS:to_list(StateData#state.pres_f),
{reply, Subscribed, StateName, StateData};
handle_sync_event(_Event, _From, StateName, StateData) ->
Reply = ok,
fsm_reply(Reply, StateName, StateData).
code_change(_OldVsn, StateName, StateData, _Extra) ->
{ok, StateName, StateData}.
%%----------------------------------------------------------------------
%% Func: handle_info/3
%% Returns: {next_state, NextStateName, NextStateData} |
%% {next_state, NextStateName, NextStateData, Timeout} |
%% {stop, Reason, NewStateData}
%%----------------------------------------------------------------------
handle_info({send_text, Text}, StateName, StateData) ->
send_text(StateData, Text),
ejabberd_hooks:run(c2s_loop_debug, [Text]),
fsm_next_state(StateName, StateData);
handle_info(replaced, _StateName, StateData) ->
Lang = StateData#state.lang,
send_element(StateData,
?SERRT_CONFLICT(Lang, "Replaced by new connection")),
send_trailer(StateData),
{stop, normal, StateData#state{authenticated = replaced}};
%% Process Packets that are to be send to the user
handle_info({route, From, To, Packet}, StateName, StateData) ->
{xmlelement, Name, Attrs, Els} = Packet,
{Pass, NewAttrs, NewState} =
case Name of
"presence" ->
State = ejabberd_hooks:run_fold(
c2s_presence_in, StateData#state.server,
StateData,
[{From, To, Packet}]),
case xml:get_attr_s("type", Attrs) of
"probe" ->
LFrom = jlib:jid_tolower(From),
LBFrom = jlib:jid_remove_resource(LFrom),
NewStateData =
case ?SETS:is_element(
LFrom, State#state.pres_a) orelse
?SETS:is_element(
LBFrom, State#state.pres_a) of
true ->
State;
false ->
case ?SETS:is_element(
LFrom, State#state.pres_f) of
true ->
A = ?SETS:add_element(
LFrom,
State#state.pres_a),
State#state{pres_a = A};
false ->
case ?SETS:is_element(
LBFrom, State#state.pres_f) of
true ->
A = ?SETS:add_element(
LBFrom,
State#state.pres_a),
State#state{pres_a = A};
false ->
State
end
end
end,
process_presence_probe(From, To, NewStateData),
{false, Attrs, NewStateData};
"error" ->
NewA = remove_element(jlib:jid_tolower(From),
State#state.pres_a),
{true, Attrs, State#state{pres_a = NewA}};
"invisible" ->
Attrs1 = lists:keydelete("type", 1, Attrs),
{true, [{"type", "unavailable"} | Attrs1], State};
"subscribe" ->
SRes = is_privacy_allow(State, From, To, Packet, in),
{SRes, Attrs, State};
"subscribed" ->
SRes = is_privacy_allow(State, From, To, Packet, in),
{SRes, Attrs, State};
"unsubscribe" ->
SRes = is_privacy_allow(State, From, To, Packet, in),
{SRes, Attrs, State};
"unsubscribed" ->
SRes = is_privacy_allow(State, From, To, Packet, in),
{SRes, Attrs, State};
_ ->
case privacy_check_packet(State, From, To, Packet, in) of
allow ->
LFrom = jlib:jid_tolower(From),
LBFrom = jlib:jid_remove_resource(LFrom),
case ?SETS:is_element(
LFrom, State#state.pres_a) orelse
?SETS:is_element(
LBFrom, State#state.pres_a) of
true ->
{true, Attrs, State};
false ->
case ?SETS:is_element(
LFrom, State#state.pres_f) of
true ->
A = ?SETS:add_element(
LFrom,
State#state.pres_a),
{true, Attrs,
State#state{pres_a = A}};
false ->
case ?SETS:is_element(
LBFrom, State#state.pres_f) of
true ->
A = ?SETS:add_element(
LBFrom,
State#state.pres_a),
{true, Attrs,
State#state{pres_a = A}};
false ->
{true, Attrs, State}
end
end
end;
deny ->
{false, Attrs, State}
end
end;
"broadcast" ->
?DEBUG("broadcast~n~p~n", [Els]),
case Els of
[{item, IJID, ISubscription}] ->
{false, Attrs,
roster_change(IJID, ISubscription,
StateData)};
[{exit, Reason}] ->
{exit, Attrs, Reason};
[{privacy_list, PrivList, PrivListName}] ->
case ejabberd_hooks:run_fold(
privacy_updated_list, StateData#state.server,
false,
[StateData#state.privacy_list,
PrivList]) of
false ->
{false, Attrs, StateData};
NewPL ->
PrivPushIQ =
#iq{type = set, xmlns = ?NS_PRIVACY,
id = "push" ++ randoms:get_string(),
sub_el = [{xmlelement, "query",
[{"xmlns", ?NS_PRIVACY}],
[{xmlelement, "list",
[{"name", PrivListName}],
[]}]}]},
PrivPushEl =
jlib:replace_from_to(
jlib:jid_remove_resource(
StateData#state.jid),
StateData#state.jid,
jlib:iq_to_xml(PrivPushIQ)),
send_element(StateData, PrivPushEl),
{false, Attrs, StateData#state{privacy_list = NewPL}}
end;
[{blocking, What}] ->
route_blocking(What, StateData),
{false, Attrs, StateData};
_ ->
{false, Attrs, StateData}
end;
"iq" ->
IQ = jlib:iq_query_info(Packet),
case IQ of
#iq{xmlns = ?NS_LAST} ->
LFrom = jlib:jid_tolower(From),
LBFrom = jlib:jid_remove_resource(LFrom),
HasFromSub = (?SETS:is_element(LFrom, StateData#state.pres_f) orelse ?SETS:is_element(LBFrom, StateData#state.pres_f))
andalso is_privacy_allow(StateData, To, From, {xmlelement, "presence", [], []}, out),
case HasFromSub of
true ->
case privacy_check_packet(StateData, From, To, Packet, in) of
allow ->
{true, Attrs, StateData};
deny ->
{false, Attrs, StateData}
end;
_ ->
Err = jlib:make_error_reply(Packet, ?ERR_FORBIDDEN),
ejabberd_router:route(To, From, Err),
{false, Attrs, StateData}
end;
IQ when (is_record(IQ, iq)) or (IQ == reply) ->
case privacy_check_packet(StateData, From, To, Packet, in) of
allow ->
{true, Attrs, StateData};
deny when is_record(IQ, iq) ->
Err = jlib:make_error_reply(
Packet, ?ERR_SERVICE_UNAVAILABLE),
ejabberd_router:route(To, From, Err),
{false, Attrs, StateData};
deny when IQ == reply ->
{false, Attrs, StateData}
end;
IQ when (IQ == invalid) or (IQ == not_iq) ->
{false, Attrs, StateData}
end;
"message" ->
case privacy_check_packet(StateData, From, To, Packet, in) of
allow ->
{true, Attrs, StateData};
deny ->
{false, Attrs, StateData}
end;
_ ->
{true, Attrs, StateData}
end,
if
Pass == exit ->
%% When Pass==exit, NewState contains a string instead of a #state{}
Lang = StateData#state.lang,
send_element(StateData, ?SERRT_CONFLICT(Lang, NewState)),
send_trailer(StateData),
{stop, normal, StateData};
Pass ->
Attrs2 = jlib:replace_from_to_attrs(jlib:jid_to_string(From),
jlib:jid_to_string(To),
NewAttrs),
FixedPacket = {xmlelement, Name, Attrs2, Els},
send_element(StateData, FixedPacket),
ejabberd_hooks:run(user_receive_packet,
StateData#state.server,
[StateData#state.jid, From, To, FixedPacket]),
ejabberd_hooks:run(c2s_loop_debug, [{route, From, To, Packet}]),
fsm_next_state(StateName, NewState);
true ->
ejabberd_hooks:run(c2s_loop_debug, [{route, From, To, Packet}]),
fsm_next_state(StateName, NewState)
end;
handle_info({'DOWN', Monitor, _Type, _Object, _Info}, _StateName, StateData)
when Monitor == StateData#state.socket_monitor ->
{stop, normal, StateData};
handle_info(system_shutdown, StateName, StateData) ->
case StateName of
wait_for_stream ->
send_header(StateData, ?MYNAME, "1.0", "en"),
send_element(StateData, ?SERR_SYSTEM_SHUTDOWN),
send_trailer(StateData),
ok;
_ ->
send_element(StateData, ?SERR_SYSTEM_SHUTDOWN),
send_trailer(StateData),
ok
end,
{stop, normal, StateData};
handle_info({force_update_presence, LUser}, StateName,
#state{user = LUser, server = LServer} = StateData) ->
NewStateData =
case StateData#state.pres_last of
{xmlelement, "presence", _Attrs, _Els} ->
PresenceEl = ejabberd_hooks:run_fold(
c2s_update_presence,
LServer,
StateData#state.pres_last,
[LUser, LServer]),
StateData2 = StateData#state{pres_last = PresenceEl},
presence_update(StateData2#state.jid,
PresenceEl,
StateData2),
StateData2;
_ ->
StateData
end,
{next_state, StateName, NewStateData};
handle_info({broadcast, Type, From, Packet}, StateName, StateData) ->
Recipients = ejabberd_hooks:run_fold(
c2s_broadcast_recipients, StateData#state.server,
[],
[StateData, Type, From, Packet]),
lists:foreach(
fun(USR) ->
ejabberd_router:route(
From, jlib:make_jid(USR), Packet)
end, lists:usort(Recipients)),
fsm_next_state(StateName, StateData);
handle_info(Info, StateName, StateData) ->
?ERROR_MSG("Unexpected info: ~p", [Info]),
fsm_next_state(StateName, StateData).
%%----------------------------------------------------------------------
%% Func: print_state/1
%% Purpose: Prepare the state to be printed on error log
%% Returns: State to print
%%----------------------------------------------------------------------
print_state(State = #state{pres_t = T, pres_f = F, pres_a = A, pres_i = I}) ->
State#state{pres_t = {pres_t, ?SETS:size(T)},
pres_f = {pres_f, ?SETS:size(F)},
pres_a = {pres_a, ?SETS:size(A)},
pres_i = {pres_i, ?SETS:size(I)}
}.
%%----------------------------------------------------------------------
%% Func: terminate/3
%% Purpose: Shutdown the fsm
%% Returns: any
%%----------------------------------------------------------------------
terminate(_Reason, StateName, StateData) ->
case StateName of
session_established ->
case StateData#state.authenticated of
replaced ->
?INFO_MSG("(~w) Replaced session for ~s",
[StateData#state.socket,
jlib:jid_to_string(StateData#state.jid)]),
From = StateData#state.jid,
Packet = {xmlelement, "presence",
[{"type", "unavailable"}],
[{xmlelement, "status", [],
[{xmlcdata, "Replaced by new connection"}]}]},
ejabberd_sm:close_session_unset_presence(
StateData#state.sid,
StateData#state.user,
StateData#state.server,
StateData#state.resource,
"Replaced by new connection"),
presence_broadcast(
StateData, From, StateData#state.pres_a, Packet),
presence_broadcast(
StateData, From, StateData#state.pres_i, Packet);
_ ->
?INFO_MSG("(~w) Close session for ~s",
[StateData#state.socket,
jlib:jid_to_string(StateData#state.jid)]),
EmptySet = ?SETS:new(),
case StateData of
#state{pres_last = undefined,
pres_a = EmptySet,
pres_i = EmptySet,
pres_invis = false} ->
ejabberd_sm:close_session(StateData#state.sid,
StateData#state.user,
StateData#state.server,
StateData#state.resource);
_ ->
From = StateData#state.jid,
Packet = {xmlelement, "presence",
[{"type", "unavailable"}], []},
ejabberd_sm:close_session_unset_presence(
StateData#state.sid,
StateData#state.user,
StateData#state.server,
StateData#state.resource,
""),
presence_broadcast(
StateData, From, StateData#state.pres_a, Packet),
presence_broadcast(
StateData, From, StateData#state.pres_i, Packet)
end
end,
bounce_messages();
_ ->
ok
end,
(StateData#state.sockmod):close(StateData#state.socket),
ok.
%%%----------------------------------------------------------------------
%%% Internal functions
%%%----------------------------------------------------------------------
change_shaper(StateData, JID) ->
Shaper = acl:match_rule(StateData#state.server,
StateData#state.shaper, JID),
(StateData#state.sockmod):change_shaper(StateData#state.socket, Shaper).
send_text(StateData, Text) when StateData#state.xml_socket ->
?DEBUG("Send Text on stream = ~p", [lists:flatten(Text)]),
(StateData#state.sockmod):send_xml(StateData#state.socket,
{xmlstreamraw, Text});
send_text(StateData, Text) ->
?DEBUG("Send XML on stream = ~p", [Text]),
(StateData#state.sockmod):send(StateData#state.socket, Text).
send_element(StateData, El) when StateData#state.xml_socket ->
(StateData#state.sockmod):send_xml(StateData#state.socket,
{xmlstreamelement, El});
send_element(StateData, El) ->
send_text(StateData, xml:element_to_binary(El)).
send_header(StateData, Server, Version, Lang)
when StateData#state.xml_socket ->
VersionAttr =
case Version of
"" -> [];
_ -> [{"version", Version}]
end,
LangAttr =
case Lang of
"" -> [];
_ -> [{"xml:lang", Lang}]
end,
Header =
{xmlstreamstart,
"stream:stream",
VersionAttr ++
LangAttr ++
[{"xmlns", "jabber:client"},
{"xmlns:stream", "http://etherx.jabber.org/streams"},
{"id", StateData#state.streamid},
{"from", Server}]},
(StateData#state.sockmod):send_xml(
StateData#state.socket, Header);
send_header(StateData, Server, Version, Lang) ->
VersionStr =
case Version of
"" -> "";
_ -> [" version='", Version, "'"]
end,
LangStr =
case Lang of
"" -> "";
_ -> [" xml:lang='", Lang, "'"]
end,
Header = io_lib:format(?STREAM_HEADER,
[StateData#state.streamid,
Server,
VersionStr,
LangStr]),
send_text(StateData, Header).
send_trailer(StateData) when StateData#state.xml_socket ->
(StateData#state.sockmod):send_xml(
StateData#state.socket,
{xmlstreamend, "stream:stream"});
send_trailer(StateData) ->
send_text(StateData, ?STREAM_TRAILER).
new_id() ->
randoms:get_string().
is_auth_packet(El) ->
case jlib:iq_query_info(El) of
#iq{id = ID, type = Type, xmlns = ?NS_AUTH, sub_el = SubEl} ->
{xmlelement, _, _, Els} = SubEl,
{auth, ID, Type,
get_auth_tags(Els, "", "", "", "")};
_ ->
false
end.
get_auth_tags([{xmlelement, Name, _Attrs, Els}| L], U, P, D, R) ->
CData = xml:get_cdata(Els),
case Name of
"username" ->
get_auth_tags(L, CData, P, D, R);
"password" ->
get_auth_tags(L, U, CData, D, R);
"digest" ->
get_auth_tags(L, U, P, CData, R);
"resource" ->
get_auth_tags(L, U, P, D, CData);
_ ->
get_auth_tags(L, U, P, D, R)
end;
get_auth_tags([_ | L], U, P, D, R) ->
get_auth_tags(L, U, P, D, R);
get_auth_tags([], U, P, D, R) ->
{U, P, D, R}.
%% Copied from ejabberd_socket.erl
-record(socket_state, {sockmod, socket, receiver}).
get_conn_type(StateData) ->
case (StateData#state.sockmod):get_sockmod(StateData#state.socket) of
gen_tcp -> c2s;
tls -> c2s_tls;
ejabberd_zlib ->
case ejabberd_zlib:get_sockmod((StateData#state.socket)#socket_state.socket) of
gen_tcp -> c2s_compressed;
tls -> c2s_compressed_tls
end;
ejabberd_http_poll -> http_poll;
ejabberd_http_bind -> http_bind;
_ -> unknown
end.
process_presence_probe(From, To, StateData) ->
LFrom = jlib:jid_tolower(From),
LBFrom = setelement(3, LFrom, ""),
case StateData#state.pres_last of
undefined ->
ok;
_ ->
Cond1 = (not StateData#state.pres_invis)
andalso (?SETS:is_element(LFrom, StateData#state.pres_f)
orelse
((LFrom /= LBFrom) andalso
?SETS:is_element(LBFrom, StateData#state.pres_f)))
andalso (not
(?SETS:is_element(LFrom, StateData#state.pres_i)
orelse
((LFrom /= LBFrom) andalso
?SETS:is_element(LBFrom, StateData#state.pres_i)))),
Cond2 = StateData#state.pres_invis
andalso ?SETS:is_element(LFrom, StateData#state.pres_f)
andalso ?SETS:is_element(LFrom, StateData#state.pres_a),
if
Cond1 ->
Timestamp = StateData#state.pres_timestamp,
Packet = xml:append_subtags(
StateData#state.pres_last,
%% To is the one sending the presence (the target of the probe)
[jlib:timestamp_to_xml(Timestamp, utc, To, ""),
%% TODO: Delete the next line once XEP-0091 is Obsolete
jlib:timestamp_to_xml(Timestamp)]),
case privacy_check_packet(StateData, To, From, Packet, out) of
deny ->
ok;
allow ->
Pid=element(2, StateData#state.sid),
ejabberd_hooks:run(presence_probe_hook, StateData#state.server, [From, To, Pid]),
%% Don't route a presence probe to oneself
case From == To of
false ->
ejabberd_router:route(To, From, Packet);
true ->
ok
end
end;
Cond2 ->
ejabberd_router:route(To, From,
{xmlelement, "presence",
[],
[]});
true ->
ok
end
end.
%% User updates his presence (non-directed presence packet)
presence_update(From, Packet, StateData) ->
{xmlelement, _Name, Attrs, _Els} = Packet,
case xml:get_attr_s("type", Attrs) of
"unavailable" ->
Status = case xml:get_subtag(Packet, "status") of
false ->
"";
StatusTag ->
xml:get_tag_cdata(StatusTag)
end,
Info = [{ip, StateData#state.ip}, {conn, StateData#state.conn},
{auth_module, StateData#state.auth_module}],
ejabberd_sm:unset_presence(StateData#state.sid,
StateData#state.user,
StateData#state.server,
StateData#state.resource,
Status,
Info),
presence_broadcast(StateData, From, StateData#state.pres_a, Packet),
presence_broadcast(StateData, From, StateData#state.pres_i, Packet),
StateData#state{pres_last = undefined,
pres_timestamp = undefined,
pres_a = ?SETS:new(),
pres_i = ?SETS:new(),
pres_invis = false};
"invisible" ->
NewPriority = get_priority_from_presence(Packet),
update_priority(NewPriority, Packet, StateData),
NewState =
if
not StateData#state.pres_invis ->
presence_broadcast(StateData, From,
StateData#state.pres_a,
Packet),
presence_broadcast(StateData, From,
StateData#state.pres_i,
Packet),
S1 = StateData#state{pres_last = undefined,
pres_timestamp = undefined,
pres_a = ?SETS:new(),
pres_i = ?SETS:new(),
pres_invis = true},
presence_broadcast_first(From, S1, Packet);
true ->
StateData
end,
NewState;
"error" ->
StateData;
"probe" ->
StateData;
"subscribe" ->
StateData;
"subscribed" ->
StateData;
"unsubscribe" ->
StateData;
"unsubscribed" ->
StateData;
_ ->
OldPriority = case StateData#state.pres_last of
undefined ->
0;
OldPresence ->
get_priority_from_presence(OldPresence)
end,
NewPriority = get_priority_from_presence(Packet),
Timestamp = calendar:now_to_universal_time(now()),
update_priority(NewPriority, Packet, StateData),
FromUnavail = (StateData#state.pres_last == undefined) or
StateData#state.pres_invis,
?DEBUG("from unavail = ~p~n", [FromUnavail]),
NewStateData = StateData#state{pres_last = Packet,
pres_invis = false,
pres_timestamp = Timestamp},
NewState =
if
FromUnavail ->
ejabberd_hooks:run(user_available_hook,
NewStateData#state.server,
[NewStateData#state.jid]),
if NewPriority >= 0 ->
resend_offline_messages(NewStateData),
resend_subscription_requests(NewStateData);
true ->
ok
end,
presence_broadcast_first(From, NewStateData, Packet);
true ->
presence_broadcast_to_trusted(NewStateData,
From,
NewStateData#state.pres_f,
NewStateData#state.pres_a,
Packet),
if OldPriority < 0, NewPriority >= 0 ->
resend_offline_messages(NewStateData);
true ->
ok
end,
NewStateData
end,
NewState
end.
%% User sends a directed presence packet
presence_track(From, To, Packet, StateData) ->
{xmlelement, _Name, Attrs, _Els} = Packet,
LTo = jlib:jid_tolower(To),
User = StateData#state.user,
Server = StateData#state.server,
case xml:get_attr_s("type", Attrs) of
"unavailable" ->
check_privacy_route(From, StateData, From, To, Packet),
I = remove_element(LTo, StateData#state.pres_i),
A = remove_element(LTo, StateData#state.pres_a),
StateData#state{pres_i = I,
pres_a = A};
"invisible" ->
check_privacy_route(From, StateData, From, To, Packet),
I = ?SETS:add_element(LTo, StateData#state.pres_i),
A = remove_element(LTo, StateData#state.pres_a),
StateData#state{pres_i = I,
pres_a = A};
"subscribe" ->
ejabberd_hooks:run(roster_out_subscription,
Server,
[User, Server, To, subscribe]),
check_privacy_route(From, StateData, jlib:jid_remove_resource(From),
To, Packet),
StateData;
"subscribed" ->
ejabberd_hooks:run(roster_out_subscription,
Server,
[User, Server, To, subscribed]),
check_privacy_route(From, StateData, jlib:jid_remove_resource(From),
To, Packet),
StateData;
"unsubscribe" ->
ejabberd_hooks:run(roster_out_subscription,
Server,
[User, Server, To, unsubscribe]),
check_privacy_route(From, StateData, jlib:jid_remove_resource(From),
To, Packet),
StateData;
"unsubscribed" ->
ejabberd_hooks:run(roster_out_subscription,
Server,
[User, Server, To, unsubscribed]),
check_privacy_route(From, StateData, jlib:jid_remove_resource(From),
To, Packet),
StateData;
"error" ->
check_privacy_route(From, StateData, From, To, Packet),
StateData;
"probe" ->
check_privacy_route(From, StateData, From, To, Packet),
StateData;
_ ->
check_privacy_route(From, StateData, From, To, Packet),
I = remove_element(LTo, StateData#state.pres_i),
A = ?SETS:add_element(LTo, StateData#state.pres_a),
StateData#state{pres_i = I,
pres_a = A}
end.
check_privacy_route(From, StateData, FromRoute, To, Packet) ->
case privacy_check_packet(StateData, From, To, Packet, out) of
deny ->
Lang = StateData#state.lang,
ErrText = "Your active privacy list has denied the routing of this stanza.",
Err = jlib:make_error_reply(Packet, ?ERRT_NOT_ACCEPTABLE(Lang, ErrText)),
ejabberd_router:route(To, From, Err),
ok;
allow ->
ejabberd_router:route(FromRoute, To, Packet)
end.
privacy_check_packet(StateData, From, To, Packet, Dir) ->
ejabberd_hooks:run_fold(
privacy_check_packet, StateData#state.server,
allow,
[StateData#state.user,
StateData#state.server,
StateData#state.privacy_list,
{From, To, Packet},
Dir]).
%% Check if privacy rules allow this delivery
is_privacy_allow(StateData, From, To, Packet, Dir) ->
allow == privacy_check_packet(StateData, From, To, Packet, Dir).
presence_broadcast(StateData, From, JIDSet, Packet) ->
lists:foreach(fun(JID) ->
FJID = jlib:make_jid(JID),
case privacy_check_packet(StateData, From, FJID, Packet, out) of
deny ->
ok;
allow ->
ejabberd_router:route(From, FJID, Packet)
end
end, ?SETS:to_list(JIDSet)).
presence_broadcast_to_trusted(StateData, From, T, A, Packet) ->
lists:foreach(
fun(JID) ->
case ?SETS:is_element(JID, T) of
true ->
FJID = jlib:make_jid(JID),
case privacy_check_packet(StateData, From, FJID, Packet, out) of
deny ->
ok;
allow ->
ejabberd_router:route(From, FJID, Packet)
end;
_ ->
ok
end
end, ?SETS:to_list(A)).
presence_broadcast_first(From, StateData, Packet) ->
?SETS:fold(fun(JID, X) ->
ejabberd_router:route(
From,
jlib:make_jid(JID),
{xmlelement, "presence",
[{"type", "probe"}],
[]}),
X
end,
[],
StateData#state.pres_t),
if
StateData#state.pres_invis ->
StateData;
true ->
As = ?SETS:fold(
fun(JID, A) ->
FJID = jlib:make_jid(JID),
case privacy_check_packet(StateData, From, FJID, Packet, out) of
deny ->
ok;
allow ->
ejabberd_router:route(From, FJID, Packet)
end,
?SETS:add_element(JID, A)
end,
StateData#state.pres_a,
StateData#state.pres_f),
StateData#state{pres_a = As}
end.
remove_element(E, Set) ->
case ?SETS:is_element(E, Set) of
true ->
?SETS:del_element(E, Set);
_ ->
Set
end.
roster_change(IJID, ISubscription, StateData) ->
LIJID = jlib:jid_tolower(IJID),
IsFrom = (ISubscription == both) or (ISubscription == from),
IsTo = (ISubscription == both) or (ISubscription == to),
OldIsFrom = ?SETS:is_element(LIJID, StateData#state.pres_f),
FSet = if
IsFrom ->
?SETS:add_element(LIJID, StateData#state.pres_f);
true ->
remove_element(LIJID, StateData#state.pres_f)
end,
TSet = if
IsTo ->
?SETS:add_element(LIJID, StateData#state.pres_t);
true ->
remove_element(LIJID, StateData#state.pres_t)
end,
case StateData#state.pres_last of
undefined ->
StateData#state{pres_f = FSet, pres_t = TSet};
P ->
?DEBUG("roster changed for ~p~n", [StateData#state.user]),
From = StateData#state.jid,
To = jlib:make_jid(IJID),
Cond1 = (not StateData#state.pres_invis) and IsFrom
and (not OldIsFrom),
Cond2 = (not IsFrom) and OldIsFrom
and (?SETS:is_element(LIJID, StateData#state.pres_a) or
?SETS:is_element(LIJID, StateData#state.pres_i)),
if
Cond1 ->
?DEBUG("C1: ~p~n", [LIJID]),
case privacy_check_packet(StateData, From, To, P, out) of
deny ->
ok;
allow ->
ejabberd_router:route(From, To, P)
end,
A = ?SETS:add_element(LIJID,
StateData#state.pres_a),
StateData#state{pres_a = A,
pres_f = FSet,
pres_t = TSet};
Cond2 ->
?DEBUG("C2: ~p~n", [LIJID]),
PU = {xmlelement, "presence",
[{"type", "unavailable"}], []},
case privacy_check_packet(StateData, From, To, PU, out) of
deny ->
ok;
allow ->
ejabberd_router:route(From, To, PU)
end,
I = remove_element(LIJID,
StateData#state.pres_i),
A = remove_element(LIJID,
StateData#state.pres_a),
StateData#state{pres_i = I,
pres_a = A,
pres_f = FSet,
pres_t = TSet};
true ->
StateData#state{pres_f = FSet, pres_t = TSet}
end
end.
update_priority(Priority, Packet, StateData) ->
Info = [{ip, StateData#state.ip}, {conn, StateData#state.conn},
{auth_module, StateData#state.auth_module}],
ejabberd_sm:set_presence(StateData#state.sid,
StateData#state.user,
StateData#state.server,
StateData#state.resource,
Priority,
Packet,
Info).
get_priority_from_presence(PresencePacket) ->
case xml:get_subtag(PresencePacket, "priority") of
false ->
0;
SubEl ->
case catch list_to_integer(xml:get_tag_cdata(SubEl)) of
P when is_integer(P) ->
P;
_ ->
0
end
end.
process_privacy_iq(From, To,
#iq{type = Type, sub_el = SubEl} = IQ,
StateData) ->
{Res, NewStateData} =
case Type of
get ->
R = ejabberd_hooks:run_fold(
privacy_iq_get, StateData#state.server,
{error, ?ERR_FEATURE_NOT_IMPLEMENTED},
[From, To, IQ, StateData#state.privacy_list]),
{R, StateData};
set ->
case ejabberd_hooks:run_fold(
privacy_iq_set, StateData#state.server,
{error, ?ERR_FEATURE_NOT_IMPLEMENTED},
[From, To, IQ]) of
{result, R, NewPrivList} ->
{{result, R},
StateData#state{privacy_list = NewPrivList}};
R -> {R, StateData}
end
end,
IQRes =
case Res of
{result, Result} ->
IQ#iq{type = result, sub_el = Result};
{error, Error} ->
IQ#iq{type = error, sub_el = [SubEl, Error]}
end,
ejabberd_router:route(
To, From, jlib:iq_to_xml(IQRes)),
NewStateData.
resend_offline_messages(StateData) ->
case ejabberd_hooks:run_fold(
resend_offline_messages_hook, StateData#state.server,
[],
[StateData#state.user, StateData#state.server]) of
Rs when is_list(Rs) ->
lists:foreach(
fun({route,
From, To, {xmlelement, _Name, _Attrs, _Els} = Packet}) ->
Pass = case privacy_check_packet(StateData, From, To, Packet, in) of
allow ->
true;
deny ->
false
end,
if
Pass ->
%% Attrs2 = jlib:replace_from_to_attrs(
%% jlib:jid_to_string(From),
%% jlib:jid_to_string(To),
%% Attrs),
%% FixedPacket = {xmlelement, Name, Attrs2, Els},
%% Use route instead of send_element to go through standard workflow
ejabberd_router:route(From, To, Packet);
%% send_element(StateData, FixedPacket),
%% ejabberd_hooks:run(user_receive_packet,
%% StateData#state.server,
%% [StateData#state.jid,
%% From, To, FixedPacket]);
true ->
ok
end
end, Rs)
end.
resend_subscription_requests(#state{user = User,
server = Server} = StateData) ->
PendingSubscriptions = ejabberd_hooks:run_fold(
resend_subscription_requests_hook,
Server,
[],
[User, Server]),
lists:foreach(fun(XMLPacket) ->
send_element(StateData,
XMLPacket)
end,
PendingSubscriptions).
get_showtag(undefined) ->
"unavailable";
get_showtag(Presence) ->
case xml:get_path_s(Presence, [{elem, "show"}, cdata]) of
"" -> "available";
ShowTag -> ShowTag
end.
get_statustag(undefined) ->
"";
get_statustag(Presence) ->
case xml:get_path_s(Presence, [{elem, "status"}, cdata]) of
ShowTag -> ShowTag
end.
process_unauthenticated_stanza(StateData, El) ->
NewEl = case xml:get_tag_attr_s("xml:lang", El) of
"" ->
case StateData#state.lang of
"" -> El;
Lang ->
xml:replace_tag_attr("xml:lang", Lang, El)
end;
_ ->
El
end,
case jlib:iq_query_info(NewEl) of
#iq{} = IQ ->
Res = ejabberd_hooks:run_fold(c2s_unauthenticated_iq,
StateData#state.server,
empty,
[StateData#state.server, IQ,
StateData#state.ip]),
case Res of
empty ->
% The only reasonable IQ's here are auth and register IQ's
% They contain secrets, so don't include subelements to response
ResIQ = IQ#iq{type = error,
sub_el = [?ERR_SERVICE_UNAVAILABLE]},
Res1 = jlib:replace_from_to(
jlib:make_jid("", StateData#state.server, ""),
jlib:make_jid("", "", ""),
jlib:iq_to_xml(ResIQ)),
send_element(StateData, jlib:remove_attr("to", Res1));
_ ->
send_element(StateData, Res)
end;
_ ->
% Drop any stanza, which isn't IQ stanza
ok
end.
peerip(SockMod, Socket) ->
IP = case SockMod of
gen_tcp -> inet:peername(Socket);
_ -> SockMod:peername(Socket)
end,
case IP of
{ok, IPOK} -> IPOK;
_ -> undefined
end.
%% fsm_next_state_pack: Pack the StateData structure to improve
%% sharing.
fsm_next_state_pack(StateName, StateData) ->
fsm_next_state_gc(StateName, pack(StateData)).
%% fsm_next_state_gc: Garbage collect the process heap to make use of
%% the newly packed StateData structure.
fsm_next_state_gc(StateName, PackedStateData) ->
erlang:garbage_collect(),
fsm_next_state(StateName, PackedStateData).
%% fsm_next_state: Generate the next_state FSM tuple with different
%% timeout, depending on the future state
fsm_next_state(session_established, StateData) ->
{next_state, session_established, StateData, ?C2S_HIBERNATE_TIMEOUT};
fsm_next_state(StateName, StateData) ->
{next_state, StateName, StateData, ?C2S_OPEN_TIMEOUT}.
%% fsm_reply: Generate the reply FSM tuple with different timeout,
%% depending on the future state
fsm_reply(Reply, session_established, StateData) ->
{reply, Reply, session_established, StateData, ?C2S_HIBERNATE_TIMEOUT};
fsm_reply(Reply, StateName, StateData) ->
{reply, Reply, StateName, StateData, ?C2S_OPEN_TIMEOUT}.
%% Used by c2s blacklist plugins
is_ip_blacklisted(undefined) ->
false;
is_ip_blacklisted({IP,_Port}) ->
ejabberd_hooks:run_fold(check_bl_c2s, false, [IP]).
%% Check from attributes
%% returns invalid-from|NewElement
check_from(El, FromJID) ->
case xml:get_tag_attr("from", El) of
false ->
El;
{value, SJID} ->
JID = jlib:string_to_jid(SJID),
case JID of
error ->
'invalid-from';
#jid{} ->
if
(JID#jid.luser == FromJID#jid.luser) and
(JID#jid.lserver == FromJID#jid.lserver) and
(JID#jid.lresource == FromJID#jid.lresource) ->
El;
(JID#jid.luser == FromJID#jid.luser) and
(JID#jid.lserver == FromJID#jid.lserver) and
(JID#jid.lresource == "") ->
El;
true ->
'invalid-from'
end
end
end.
fsm_limit_opts(Opts) ->
case lists:keysearch(max_fsm_queue, 1, Opts) of
{value, {_, N}} when is_integer(N) ->
[{max_queue, N}];
_ ->
case ejabberd_config:get_local_option(max_fsm_queue) of
N when is_integer(N) ->
[{max_queue, N}];
_ ->
[]
end
end.
bounce_messages() ->
receive
{route, From, To, El} ->
ejabberd_router:route(From, To, El),
bounce_messages()
after 0 ->
ok
end.
%%%----------------------------------------------------------------------
%%% XEP-0191
%%%----------------------------------------------------------------------
route_blocking(What, StateData) ->
SubEl =
case What of
{block, JIDs} ->
{xmlelement, "block",
[{"xmlns", ?NS_BLOCKING}],
lists:map(
fun(JID) ->
{xmlelement, "item",
[{"jid", jlib:jid_to_string(JID)}],
[]}
end, JIDs)};
{unblock, JIDs} ->
{xmlelement, "unblock",
[{"xmlns", ?NS_BLOCKING}],
lists:map(
fun(JID) ->
{xmlelement, "item",
[{"jid", jlib:jid_to_string(JID)}],
[]}
end, JIDs)};
unblock_all ->
{xmlelement, "unblock",
[{"xmlns", ?NS_BLOCKING}], []}
end,
PrivPushIQ =
#iq{type = set, xmlns = ?NS_BLOCKING,
id = "push",
sub_el = [SubEl]},
PrivPushEl =
jlib:replace_from_to(
jlib:jid_remove_resource(
StateData#state.jid),
StateData#state.jid,
jlib:iq_to_xml(PrivPushIQ)),
send_element(StateData, PrivPushEl),
%% No need to replace active privacy list here,
%% blocking pushes are always accompanied by
%% Privacy List pushes
ok.
%%%----------------------------------------------------------------------
%%% JID Set memory footprint reduction code
%%%----------------------------------------------------------------------
%% Try to reduce the heap footprint of the four presence sets
%% by ensuring that we re-use strings and Jids wherever possible.
pack(S = #state{pres_a=A,
pres_i=I,
pres_f=F,
pres_t=T}) ->
{NewA, Pack1} = pack_jid_set(A, gb_trees:empty()),
{NewI, Pack2} = pack_jid_set(I, Pack1),
{NewF, Pack3} = pack_jid_set(F, Pack2),
{NewT, _Pack4} = pack_jid_set(T, Pack3),
%% Throw away Pack4 so that if we delete references to
%% Strings or Jids in any of the sets there will be
%% no live references for the GC to find.
S#state{pres_a=NewA,
pres_i=NewI,
pres_f=NewF,
pres_t=NewT}.
pack_jid_set(Set, Pack) ->
Jids = ?SETS:to_list(Set),
{PackedJids, NewPack} = pack_jids(Jids, Pack, []),
{?SETS:from_list(PackedJids), NewPack}.
pack_jids([], Pack, Acc) -> {Acc, Pack};
pack_jids([{U,S,R}=Jid | Jids], Pack, Acc) ->
case gb_trees:lookup(Jid, Pack) of
{value, PackedJid} ->
pack_jids(Jids, Pack, [PackedJid | Acc]);
none ->
{NewU, Pack1} = pack_string(U, Pack),
{NewS, Pack2} = pack_string(S, Pack1),
{NewR, Pack3} = pack_string(R, Pack2),
NewJid = {NewU, NewS, NewR},
NewPack = gb_trees:insert(NewJid, NewJid, Pack3),
pack_jids(Jids, NewPack, [NewJid | Acc])
end.
pack_string(String, Pack) ->
case gb_trees:lookup(String, Pack) of
{value, PackedString} ->
{PackedString, Pack};
none ->
{String, gb_trees:insert(String, String, Pack)}
end.
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