Chapril/xmpp.chapril.org-ejabberd
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XEP-0198: Don't drop session on failed resume

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The 'previd' value provided by the client during a session resume
request includes the client's JID and ejabberd's session ID.  If there
is a session for the requested JID but with a different session ID,
resumption should fail, but that session shouldn't be closed.  This
commit makes sure the latter won't happen.

In practice, this will only make a difference in odd corner cases.
This commit is contained in:
Holger Weiss 2014-05-23 23:38:04 +02:00
parent 6baf3a24de
commit 59f6efeaf7
1 changed files with 11 additions and 6 deletions
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17
src/ejabberd_c2s.erl
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@ -1312,8 +1312,8 @@ handle_sync_event(get_subscribed, _From, StateName,
StateData) ->
Subscribed = (?SETS):to_list(StateData#state.pres_f),
{reply, Subscribed, StateName, StateData};
handle_sync_event(resume_session, _From, _StateName,
StateData) ->
handle_sync_event({resume_session, Time}, _From, _StateName,
StateData) when element(1, StateData#state.sid) == Time ->
%% The old session should be closed before the new one is opened, so we do
%% this here instead of leaving it to the terminate callback
ejabberd_sm:close_session(StateData#state.sid,
@ -1321,6 +1321,9 @@ handle_sync_event(resume_session, _From, _StateName,
StateData#state.server,
StateData#state.resource),
{stop, normal, {ok, StateData}, StateData#state{mgmt_state = resumed}};
handle_sync_event({resume_session, _Time}, _From, StateName,
StateData) ->
{reply, {error, <<"Previous session not found">>}, StateName, StateData};
handle_sync_event(_Event, _From, StateName,
StateData) ->
Reply = ok, fsm_reply(Reply, StateName, StateData).
@ -2894,8 +2897,8 @@ inherit_session_state(#state{user = U, server = S} = StateData, ResumeID) ->
{error, <<"Previous session PID not found">>};
OldPID ->
OldSID = {Time, OldPID},
case catch resume_session(OldPID) of
{ok, #state{sid = OldSID} = OldStateData} ->
case catch resume_session(OldSID) of
{ok, OldStateData} ->
NewSID = {Time, self()}, % Old time, new PID
Priority = case OldStateData#state.pres_last of
undefined ->
@ -2927,6 +2930,8 @@ inherit_session_state(#state{user = U, server = S} = StateData, ResumeID) ->
mgmt_stanzas_in = OldStateData#state.mgmt_stanzas_in,
mgmt_stanzas_out = OldStateData#state.mgmt_stanzas_out,
mgmt_state = active}};
{error, Msg} ->
{error, Msg};
_ ->
{error, <<"Cannot grab session state">>}
end
@ -2935,8 +2940,8 @@ inherit_session_state(#state{user = U, server = S} = StateData, ResumeID) ->
{error, <<"Invalid 'previd' value">>}
end.
resume_session(FsmRef) ->
(?GEN_FSM):sync_send_all_state_event(FsmRef, resume_session, 3000).
resume_session({Time, PID}) ->
(?GEN_FSM):sync_send_all_state_event(PID, {resume_session, Time}, 3000).
make_resume_id(StateData) ->
{Time, _} = StateData#state.sid,