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xmpp.chapril.org-ejabberd/src/ejabberd_sm.erl

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%%%----------------------------------------------------------------------
%%% File : ejabberd_sm.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Session manager
%%% Created : 24 Nov 2002 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_sm).
-author('alexey@process-one.net').
-behaviour(gen_server).
%% API
-export([start_link/0,
route/3,
open_session/5, close_session/4,
check_in_subscription/6,
bounce_offline_message/3,
disconnect_removed_user/2,
get_user_resources/2,
set_presence/7,
unset_presence/6,
close_session_unset_presence/5,
dirty_get_sessions_list/0,
dirty_get_my_sessions_list/0,
get_vh_session_list/1,
get_vh_session_number/1,
register_iq_handler/4,
register_iq_handler/5,
unregister_iq_handler/2,
connected_users/0,
connected_users_number/0,
user_resources/2,
get_session_pid/3,
get_user_info/3,
get_user_ip/3
]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-include("ejabberd.hrl").
-include("jlib.hrl").
-include("ejabberd_commands.hrl").
-include("mod_privacy.hrl").
-record(session, {sid, usr, us, priority, info}).
-record(session_counter, {vhost, count}).
-record(state, {}).
%% default value for the maximum number of user connections
-define(MAX_USER_SESSIONS, infinity).
%%====================================================================
%% API
%%====================================================================
%%--------------------------------------------------------------------
%% Function: start_link() -> {ok,Pid} | ignore | {error,Error}
%% Description: Starts the server
%%--------------------------------------------------------------------
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
route(From, To, Packet) ->
case catch do_route(From, To, Packet) of
{'EXIT', Reason} ->
?ERROR_MSG("~p~nwhen processing: ~p",
[Reason, {From, To, Packet}]);
_ ->
ok
end.
open_session(SID, User, Server, Resource, Info) ->
set_session(SID, User, Server, Resource, undefined, Info),
mnesia:dirty_update_counter(session_counter,
jlib:nameprep(Server), 1),
check_for_sessions_to_replace(User, Server, Resource),
JID = jlib:make_jid(User, Server, Resource),
ejabberd_hooks:run(sm_register_connection_hook, JID#jid.lserver,
[SID, JID, Info]).
close_session(SID, User, Server, Resource) ->
Info = case mnesia:dirty_read({session, SID}) of
[] -> [];
[#session{info=I}] -> I
end,
F = fun() ->
mnesia:delete({session, SID}),
mnesia:dirty_update_counter(session_counter,
jlib:nameprep(Server), -1)
end,
mnesia:sync_dirty(F),
JID = jlib:make_jid(User, Server, Resource),
ejabberd_hooks:run(sm_remove_connection_hook, JID#jid.lserver,
[SID, JID, Info]).
check_in_subscription(Acc, User, Server, _JID, _Type, _Reason) ->
case ejabberd_auth:is_user_exists(User, Server) of
true ->
Acc;
false ->
{stop, false}
end.
bounce_offline_message(From, To, Packet) ->
Err = jlib:make_error_reply(Packet, ?ERR_SERVICE_UNAVAILABLE),
ejabberd_router:route(To, From, Err),
stop.
disconnect_removed_user(User, Server) ->
ejabberd_sm:route(jlib:make_jid("", "", ""),
jlib:make_jid(User, Server, ""),
{xmlelement, "broadcast", [],
[{exit, "User removed"}]}).
get_user_resources(User, Server) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
US = {LUser, LServer},
case catch mnesia:dirty_index_read(session, US, #session.us) of
{'EXIT', _Reason} ->
[];
Ss ->
[element(3, S#session.usr) || S <- clean_session_list(Ss)]
end.
get_user_ip(User, Server, Resource) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
LResource = jlib:resourceprep(Resource),
USR = {LUser, LServer, LResource},
case mnesia:dirty_index_read(session, USR, #session.usr) of
[] ->
undefined;
Ss ->
Session = lists:max(Ss),
proplists:get_value(ip, Session#session.info)
end.
get_user_info(User, Server, Resource) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
LResource = jlib:resourceprep(Resource),
USR = {LUser, LServer, LResource},
case mnesia:dirty_index_read(session, USR, #session.usr) of
[] ->
offline;
Ss ->
Session = lists:max(Ss),
Node = node(element(2, Session#session.sid)),
Conn = proplists:get_value(conn, Session#session.info),
IP = proplists:get_value(ip, Session#session.info),
[{node, Node}, {conn, Conn}, {ip, IP}]
end.
set_presence(SID, User, Server, Resource, Priority, Presence, Info) ->
set_session(SID, User, Server, Resource, Priority, Info),
ejabberd_hooks:run(set_presence_hook, jlib:nameprep(Server),
[User, Server, Resource, Presence]).
unset_presence(SID, User, Server, Resource, Status, Info) ->
set_session(SID, User, Server, Resource, undefined, Info),
ejabberd_hooks:run(unset_presence_hook, jlib:nameprep(Server),
[User, Server, Resource, Status]).
close_session_unset_presence(SID, User, Server, Resource, Status) ->
close_session(SID, User, Server, Resource),
ejabberd_hooks:run(unset_presence_hook, jlib:nameprep(Server),
[User, Server, Resource, Status]).
get_session_pid(User, Server, Resource) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
LResource = jlib:resourceprep(Resource),
USR = {LUser, LServer, LResource},
case catch mnesia:dirty_index_read(session, USR, #session.usr) of
[#session{sid = {_, Pid}}] -> Pid;
_ -> none
end.
dirty_get_sessions_list() ->
mnesia:dirty_select(
session,
[{#session{usr = '$1', _ = '_'},
[],
['$1']}]).
dirty_get_my_sessions_list() ->
mnesia:dirty_select(
session,
[{#session{sid = {'_', '$1'}, _ = '_'},
[{'==', {node, '$1'}, node()}],
['$_']}]).
get_vh_session_list(Server) ->
LServer = jlib:nameprep(Server),
mnesia:dirty_select(
session,
[{#session{usr = '$1', _ = '_'},
[{'==', {element, 2, '$1'}, LServer}],
['$1']}]).
get_vh_session_number(Server) ->
LServer = jlib:nameprep(Server),
Query = mnesia:dirty_select(
session_counter,
[{#session_counter{vhost = LServer, count = '$1'},
[],
['$1']}]),
case Query of
[Count] ->
Count;
_ -> 0
end.
register_iq_handler(Host, XMLNS, Module, Fun) ->
ejabberd_sm ! {register_iq_handler, Host, XMLNS, Module, Fun}.
register_iq_handler(Host, XMLNS, Module, Fun, Opts) ->
ejabberd_sm ! {register_iq_handler, Host, XMLNS, Module, Fun, Opts}.
unregister_iq_handler(Host, XMLNS) ->
ejabberd_sm ! {unregister_iq_handler, Host, XMLNS}.
%%====================================================================
%% gen_server callbacks
%%====================================================================
%%--------------------------------------------------------------------
%% Function: init(Args) -> {ok, State} |
%% {ok, State, Timeout} |
%% ignore |
%% {stop, Reason}
%% Description: Initiates the server
%%--------------------------------------------------------------------
init([]) ->
update_tables(),
mnesia:create_table(session,
[{ram_copies, [node()]},
{attributes, record_info(fields, session)}]),
mnesia:create_table(session_counter,
[{ram_copies, [node()]},
{attributes, record_info(fields, session_counter)}]),
mnesia:add_table_index(session, usr),
mnesia:add_table_index(session, us),
mnesia:add_table_copy(session, node(), ram_copies),
mnesia:add_table_copy(session_counter, node(), ram_copies),
mnesia:subscribe(system),
ets:new(sm_iqtable, [named_table]),
lists:foreach(
fun(Host) ->
ejabberd_hooks:add(roster_in_subscription, Host,
ejabberd_sm, check_in_subscription, 20),
ejabberd_hooks:add(offline_message_hook, Host,
ejabberd_sm, bounce_offline_message, 100),
ejabberd_hooks:add(remove_user, Host,
ejabberd_sm, disconnect_removed_user, 100)
end, ?MYHOSTS),
ejabberd_commands:register_commands(commands()),
{ok, #state{}}.
%%--------------------------------------------------------------------
%% 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(_Request, _From, State) ->
Reply = ok,
{reply, Reply, State}.
%%--------------------------------------------------------------------
%% Function: handle_cast(Msg, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% Description: Handling cast messages
%%--------------------------------------------------------------------
handle_cast(_Msg, State) ->
{noreply, State}.
%%--------------------------------------------------------------------
%% Function: handle_info(Info, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% Description: Handling all non call/cast messages
%%--------------------------------------------------------------------
handle_info({route, From, To, Packet}, State) ->
case catch do_route(From, To, Packet) of
{'EXIT', Reason} ->
?ERROR_MSG("~p~nwhen processing: ~p",
[Reason, {From, To, Packet}]);
_ ->
ok
end,
{noreply, State};
handle_info({mnesia_system_event, {mnesia_down, Node}}, State) ->
recount_session_table(Node),
{noreply, State};
handle_info({register_iq_handler, Host, XMLNS, Module, Function}, State) ->
ets:insert(sm_iqtable, {{XMLNS, Host}, Module, Function}),
{noreply, State};
handle_info({register_iq_handler, Host, XMLNS, Module, Function, Opts}, State) ->
ets:insert(sm_iqtable, {{XMLNS, Host}, Module, Function, Opts}),
{noreply, State};
handle_info({unregister_iq_handler, Host, XMLNS}, State) ->
case ets:lookup(sm_iqtable, {XMLNS, Host}) of
[{_, Module, Function, Opts}] ->
gen_iq_handler:stop_iq_handler(Module, Function, Opts);
_ ->
ok
end,
ets:delete(sm_iqtable, {XMLNS, Host}),
{noreply, State};
handle_info(_Info, State) ->
{noreply, State}.
%%--------------------------------------------------------------------
%% 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) ->
ejabberd_commands:unregister_commands(commands()),
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
%%--------------------------------------------------------------------
set_session(SID, User, Server, Resource, Priority, Info) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
LResource = jlib:resourceprep(Resource),
US = {LUser, LServer},
USR = {LUser, LServer, LResource},
F = fun() ->
mnesia:write(#session{sid = SID,
usr = USR,
us = US,
priority = Priority,
info = Info})
end,
mnesia:sync_dirty(F).
%% Recalculates alive sessions when Node goes down
%% and updates session and session_counter tables
recount_session_table(Node) ->
F = fun() ->
Es = mnesia:select(
session,
[{#session{sid = {'_', '$1'}, _ = '_'},
[{'==', {node, '$1'}, Node}],
['$_']}]),
lists:foreach(fun(E) ->
mnesia:delete({session, E#session.sid})
end, Es),
%% reset session_counter table with active sessions
mnesia:clear_table(session_counter),
lists:foreach(fun(Server) ->
LServer = jlib:nameprep(Server),
Hs = mnesia:select(session,
[{#session{usr = '$1', _ = '_'},
[{'==', {element, 2, '$1'}, LServer}],
['$1']}]),
mnesia:write(
#session_counter{vhost = LServer,
count = length(Hs)})
end, ?MYHOSTS)
end,
mnesia:async_dirty(F).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
do_route(From, To, Packet) ->
?DEBUG("session manager~n\tfrom ~p~n\tto ~p~n\tpacket ~P~n",
[From, To, Packet, 8]),
#jid{user = User, server = Server,
luser = LUser, lserver = LServer, lresource = LResource} = To,
{xmlelement, Name, Attrs, _Els} = Packet,
case LResource of
"" ->
case Name of
"presence" ->
{Pass, _Subsc} =
case xml:get_attr_s("type", Attrs) of
"subscribe" ->
Reason = xml:get_path_s(
Packet,
[{elem, "status"}, cdata]),
{is_privacy_allow(From, To, Packet) andalso
ejabberd_hooks:run_fold(
roster_in_subscription,
LServer,
false,
[User, Server, From, subscribe, Reason]),
true};
"subscribed" ->
{is_privacy_allow(From, To, Packet) andalso
ejabberd_hooks:run_fold(
roster_in_subscription,
LServer,
false,
[User, Server, From, subscribed, ""]),
true};
"unsubscribe" ->
{is_privacy_allow(From, To, Packet) andalso
ejabberd_hooks:run_fold(
roster_in_subscription,
LServer,
false,
[User, Server, From, unsubscribe, ""]),
true};
"unsubscribed" ->
{is_privacy_allow(From, To, Packet) andalso
ejabberd_hooks:run_fold(
roster_in_subscription,
LServer,
false,
[User, Server, From, unsubscribed, ""]),
true};
_ ->
{true, false}
end,
if Pass ->
PResources = get_user_present_resources(
LUser, LServer),
lists:foreach(
fun({_, R}) ->
do_route(
From,
jlib:jid_replace_resource(To, R),
Packet)
end, PResources);
true ->
ok
end;
"message" ->
route_message(From, To, Packet);
"iq" ->
process_iq(From, To, Packet);
"broadcast" ->
lists:foreach(
fun(R) ->
do_route(From,
jlib:jid_replace_resource(To, R),
Packet)
end, get_user_resources(User, Server));
_ ->
ok
end;
_ ->
USR = {LUser, LServer, LResource},
case mnesia:dirty_index_read(session, USR, #session.usr) of
[] ->
case Name of
"message" ->
route_message(From, To, Packet);
"iq" ->
case xml:get_attr_s("type", Attrs) of
"error" -> ok;
"result" -> ok;
_ ->
Err =
jlib:make_error_reply(
Packet, ?ERR_SERVICE_UNAVAILABLE),
ejabberd_router:route(To, From, Err)
end;
_ ->
?DEBUG("packet droped~n", [])
end;
Ss ->
Session = lists:max(Ss),
Pid = element(2, Session#session.sid),
?DEBUG("sending to process ~p~n", [Pid]),
Pid ! {route, From, To, Packet}
end
end.
%% The default list applies to the user as a whole,
%% and is processed if there is no active list set
%% for the target session/resource to which a stanza is addressed,
%% or if there are no current sessions for the user.
is_privacy_allow(From, To, Packet) ->
User = To#jid.user,
Server = To#jid.server,
PrivacyList = ejabberd_hooks:run_fold(privacy_get_user_list, Server,
#userlist{}, [User, Server]),
is_privacy_allow(From, To, Packet, PrivacyList).
%% Check if privacy rules allow this delivery
%% Function copied from ejabberd_c2s.erl
is_privacy_allow(From, To, Packet, PrivacyList) ->
User = To#jid.user,
Server = To#jid.server,
allow == ejabberd_hooks:run_fold(
privacy_check_packet, Server,
allow,
[User,
Server,
PrivacyList,
{From, To, Packet},
in]).
route_message(From, To, Packet) ->
LUser = To#jid.luser,
LServer = To#jid.lserver,
PrioRes = get_user_present_resources(LUser, LServer),
case catch lists:max(PrioRes) of
{Priority, _R} when is_integer(Priority), Priority >= 0 ->
lists:foreach(
%% Route messages to all priority that equals the max, if
%% positive
fun({P, R}) when P == Priority ->
LResource = jlib:resourceprep(R),
USR = {LUser, LServer, LResource},
case mnesia:dirty_index_read(session, USR, #session.usr) of
[] ->
ok; % Race condition
Ss ->
Session = lists:max(Ss),
Pid = element(2, Session#session.sid),
?DEBUG("sending to process ~p~n", [Pid]),
Pid ! {route, From, To, Packet}
end;
%% Ignore other priority:
({_Prio, _Res}) ->
ok
end,
PrioRes);
_ ->
case xml:get_tag_attr_s("type", Packet) of
"error" ->
ok;
"groupchat" ->
bounce_offline_message(From, To, Packet);
"headline" ->
bounce_offline_message(From, To, Packet);
_ ->
case ejabberd_auth:is_user_exists(LUser, LServer) of
true ->
ejabberd_hooks:run(offline_message_hook,
LServer,
[From, To, Packet]);
_ ->
Err = jlib:make_error_reply(
Packet, ?ERR_SERVICE_UNAVAILABLE),
ejabberd_router:route(To, From, Err)
end
end
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
clean_session_list(Ss) ->
clean_session_list(lists:keysort(#session.usr, Ss), []).
clean_session_list([], Res) ->
Res;
clean_session_list([S], Res) ->
[S | Res];
clean_session_list([S1, S2 | Rest], Res) ->
if
S1#session.usr == S2#session.usr ->
if
S1#session.sid > S2#session.sid ->
clean_session_list([S1 | Rest], Res);
true ->
clean_session_list([S2 | Rest], Res)
end;
true ->
clean_session_list([S2 | Rest], [S1 | Res])
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
get_user_present_resources(LUser, LServer) ->
US = {LUser, LServer},
case catch mnesia:dirty_index_read(session, US, #session.us) of
{'EXIT', _Reason} ->
[];
Ss ->
[{S#session.priority, element(3, S#session.usr)} ||
S <- clean_session_list(Ss), is_integer(S#session.priority)]
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% On new session, check if some existing connections need to be replace
check_for_sessions_to_replace(User, Server, Resource) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
LResource = jlib:resourceprep(Resource),
%% TODO: Depending on how this is executed, there could be an unneeded
%% replacement for max_sessions. We need to check this at some point.
check_existing_resources(LUser, LServer, LResource),
check_max_sessions(LUser, LServer).
check_existing_resources(LUser, LServer, LResource) ->
USR = {LUser, LServer, LResource},
%% A connection exist with the same resource. We replace it:
SIDs = mnesia:dirty_select(
session,
[{#session{sid = '$1', usr = USR, _ = '_'}, [], ['$1']}]),
if
SIDs == [] -> ok;
true ->
MaxSID = lists:max(SIDs),
lists:foreach(
fun({_, Pid} = S) when S /= MaxSID ->
Pid ! replaced;
(_) -> ok
end, SIDs)
end.
check_max_sessions(LUser, LServer) ->
%% If the max number of sessions for a given is reached, we replace the
%% first one
SIDs = mnesia:dirty_select(
session,
[{#session{sid = '$1', us = {LUser, LServer}, _ = '_'}, [],
['$1']}]),
MaxSessions = get_max_user_sessions(LUser, LServer),
if
length(SIDs) =< MaxSessions ->
ok;
true ->
{_, Pid} = lists:min(SIDs),
Pid ! replaced
end.
%% Get the user_max_session setting
%% This option defines the max number of time a given users are allowed to
%% log in
%% Defaults to infinity
get_max_user_sessions(LUser, Host) ->
case acl:match_rule(
Host, max_user_sessions, jlib:make_jid(LUser, Host, "")) of
Max when is_integer(Max) -> Max;
infinity -> infinity;
_ -> ?MAX_USER_SESSIONS
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
process_iq(From, To, Packet) ->
IQ = jlib:iq_query_info(Packet),
case IQ of
#iq{xmlns = XMLNS} ->
Host = To#jid.lserver,
case ets:lookup(sm_iqtable, {XMLNS, Host}) of
[{_, Module, Function}] ->
ResIQ = Module:Function(From, To, IQ),
if
ResIQ /= ignore ->
ejabberd_router:route(To, From,
jlib:iq_to_xml(ResIQ));
true ->
ok
end;
[{_, Module, Function, Opts}] ->
gen_iq_handler:handle(Host, Module, Function, Opts,
From, To, IQ);
[] ->
Err = jlib:make_error_reply(
Packet, ?ERR_SERVICE_UNAVAILABLE),
ejabberd_router:route(To, From, Err)
end;
reply ->
ok;
_ ->
Err = jlib:make_error_reply(Packet, ?ERR_BAD_REQUEST),
ejabberd_router:route(To, From, Err),
ok
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% ejabberd commands
commands() ->
[
#ejabberd_commands{name = connected_users,
tags = [session],
desc = "List all established sessions",
module = ?MODULE, function = connected_users,
args = [],
result = {connected_users, {list, {sessions, string}}}},
#ejabberd_commands{name = connected_users_number,
tags = [session, stats],
desc = "Get the number of established sessions",
module = ?MODULE, function = connected_users_number,
args = [],
result = {num_sessions, integer}},
#ejabberd_commands{name = user_resources,
tags = [session],
desc = "List user's connected resources",
module = ?MODULE, function = user_resources,
args = [{user, string}, {host, string}],
result = {resources, {list, {resource, string}}}}
].
connected_users() ->
USRs = dirty_get_sessions_list(),
SUSRs = lists:sort(USRs),
lists:map(fun({U, S, R}) -> [U, $@, S, $/, R] end, SUSRs).
connected_users_number() ->
length(dirty_get_sessions_list()).
user_resources(User, Server) ->
Resources = get_user_resources(User, Server),
lists:sort(Resources).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% Update Mnesia tables
update_tables() ->
case catch mnesia:table_info(session, attributes) of
[ur, user, node] ->
mnesia:delete_table(session);
[ur, user, pid] ->
mnesia:delete_table(session);
[usr, us, pid] ->
mnesia:delete_table(session);
[sid, usr, us, priority] ->
mnesia:delete_table(session);
[sid, usr, us, priority, info] ->
ok;
{'EXIT', _} ->
ok
end,
case lists:member(presence, mnesia:system_info(tables)) of
true ->
mnesia:delete_table(presence);
false ->
ok
end,
case lists:member(local_session, mnesia:system_info(tables)) of
true ->
mnesia:delete_table(local_session);
false ->
ok
end.
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