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https://github.com/processone/ejabberd.git
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mod_stream_mgmt: Don't kill new PID on resumption
During XEP-0198 resumption, the ejabberd_c2s process that handles the
new connection reopens the ejabberd_sm session of the old one. Since
commit b4770815c0, the new process adds
the new session table entry before the old process removes the old one.
While adding the new one, ejabberd_sm checks for old sessions to
replace. This check assumes old SIDs compare lower than new ones. This
assumption didn't necessarily hold for the session resumption case,
where the old SID's timestamp was copied over to the new SID and only
the PID was updated. Therefore, the new process was killed if the new
PID happened to be smaller than the old one.
Fix this by having mod_stream_mgmt use its own SM-ID rather than copying
over the old SID's timestamp to the new SID.
Thanks to Thilo Molitor and Friedrich Altheide for reporting the issue,
and to Thomas Leister for his help with debugging it.
This commit is contained in:
Holger Weiss
parent
c62956ab7b
commit
cd336369a5
@ -180,10 +180,9 @@ host_down(Host) ->
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%% Copies content of one c2s state to another.
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%% This is needed for session migration from one pid to another.
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-spec copy_state(state(), state()) -> state().
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copy_state(#{owner := Owner} = NewState,
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#{jid := JID, resource := Resource, sid := {Time, _},
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auth_module := AuthModule, lserver := LServer,
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pres_a := PresA} = OldState) ->
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copy_state(NewState,
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#{jid := JID, resource := Resource, auth_module := AuthModule,
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lserver := LServer, pres_a := PresA} = OldState) ->
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State1 = case OldState of
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#{pres_last := Pres, pres_timestamp := PresTS} ->
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NewState#{pres_last => Pres, pres_timestamp => PresTS};
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@ -193,7 +192,6 @@ copy_state(#{owner := Owner} = NewState,
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Conn = get_conn_type(State1),
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State2 = State1#{jid => JID, resource => Resource,
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conn => Conn,
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sid => {Time, Owner},
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auth_module => AuthModule,
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pres_a => PresA},
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ejabberd_hooks:run_fold(c2s_copy_session, LServer, State2, [OldState]).
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@ -52,6 +52,7 @@
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-type state() :: ejabberd_c2s:state().
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-type queue() :: p1_queue:queue({non_neg_integer(), erlang:timestamp(), xmpp_element() | xmlel()}).
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-type id() :: binary().
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-type error_reason() :: session_not_found | session_timed_out |
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session_is_dead | session_has_exited |
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session_was_killed | session_copy_timed_out |
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@ -228,8 +229,8 @@ c2s_handle_send(#{mgmt_state := MgmtState, mod := Mod,
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c2s_handle_send(State, _Pkt, _Result) ->
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State.
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c2s_handle_call(#{sid := {Time, _}, mod := Mod, mgmt_queue := Queue} = State,
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{resume_session, Time}, From) ->
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c2s_handle_call(#{mgmt_id := MgmtID, mgmt_queue := Queue, mod := Mod} = State,
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{resume_session, MgmtID}, From) ->
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State1 = State#{mgmt_queue => p1_queue:file_to_ram(Queue)},
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Mod:reply(From, {resume, State1}),
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{stop, State#{mgmt_state => resumed, mgmt_queue => p1_queue:clear(Queue)}};
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@ -288,10 +289,10 @@ c2s_terminated(#{mgmt_state := resumed, sid := SID, jid := JID} = State, _Reason
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ejabberd_c2s:bounce_message_queue(SID, JID),
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{stop, State};
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c2s_terminated(#{mgmt_state := MgmtState, mgmt_stanzas_in := In,
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sid := {Time, _}, jid := JID} = State, _Reason) ->
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mgmt_id := MgmtID, jid := JID} = State, _Reason) ->
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case MgmtState of
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timeout ->
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store_stanzas_in(jid:tolower(JID), Time, In);
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store_stanzas_in(jid:tolower(JID), MgmtID, In);
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_ ->
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ok
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end,
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@ -377,6 +378,7 @@ handle_enable(#{mgmt_timeout := DefaultTimeout,
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mgmt_max_timeout := MaxTimeout,
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mgmt_xmlns := Xmlns, jid := JID} = State,
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#sm_enable{resume = Resume, max = Max}) ->
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State1 = State#{mgmt_id => make_id()},
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Timeout = if Resume == false ->
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0;
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Max /= undefined, Max > 0, Max*1000 =< MaxTimeout ->
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@ -388,7 +390,7 @@ handle_enable(#{mgmt_timeout := DefaultTimeout,
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?DEBUG("Stream management with resumption enabled for ~ts",
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[jid:encode(JID)]),
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#sm_enabled{xmlns = Xmlns,
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id = make_resume_id(State),
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id = encode_id(State1),
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resume = true,
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max = Timeout div 1000};
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true ->
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@ -396,10 +398,10 @@ handle_enable(#{mgmt_timeout := DefaultTimeout,
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[jid:encode(JID)]),
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#sm_enabled{xmlns = Xmlns}
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end,
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State1 = State#{mgmt_state => active,
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State2 = State1#{mgmt_state => active,
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mgmt_queue => p1_queue:new(QueueType),
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mgmt_timeout => Timeout},
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send(State1, Res).
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send(State2, Res).
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-spec handle_r(state()) -> state().
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handle_r(#{mgmt_xmlns := Xmlns, mgmt_stanzas_in := H} = State) ->
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@ -431,10 +433,9 @@ handle_resume(#{user := User, lserver := LServer,
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{ok, #{jid := JID} = ResumedState, NumHandled} ->
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State1 = check_h_attribute(ResumedState, NumHandled),
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#{mgmt_xmlns := AttrXmlns, mgmt_stanzas_in := AttrH} = State1,
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AttrId = make_resume_id(State1),
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State2 = send(State1, #sm_resumed{xmlns = AttrXmlns,
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h = AttrH,
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previd = AttrId}),
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previd = PrevID}),
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State3 = resend_unacked_stanzas(State2),
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State4 = send(State3, #sm_r{xmlns = AttrXmlns}),
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State5 = ejabberd_hooks:run_fold(c2s_session_resumed, LServer, State4, []),
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@ -649,20 +650,19 @@ route_unacked_stanzas(_State) ->
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{error, error_reason()} |
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{error, error_reason(), non_neg_integer()}.
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inherit_session_state(#{user := U, server := S,
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mgmt_queue_type := QueueType} = State, ResumeID) ->
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case misc:base64_to_term(ResumeID) of
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{term, {R, Time}} ->
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case ejabberd_sm:get_session_pid(U, S, R) of
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mgmt_queue_type := QueueType} = State, PrevID) ->
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case decode_id(PrevID) of
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{ok, {R, MgmtID}} ->
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case ejabberd_sm:get_session_sid(U, S, R) of
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none ->
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case pop_stanzas_in({U, S, R}, Time) of
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case pop_stanzas_in({U, S, R}, MgmtID) of
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error ->
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{error, session_not_found};
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{ok, H} ->
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{error, session_timed_out, H}
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end;
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OldPID ->
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OldSID = {Time, OldPID},
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try resume_session(OldSID, State) of
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{_, OldPID} = OldSID ->
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try resume_session(OldPID, MgmtID, State) of
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{resume, #{mgmt_xmlns := Xmlns,
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mgmt_queue := Queue,
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mgmt_timeout := Timeout,
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@ -673,7 +673,9 @@ inherit_session_state(#{user := U, server := S,
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ram -> Queue;
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_ -> p1_queue:ram_to_file(Queue)
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end,
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State2 = State1#{mgmt_xmlns => Xmlns,
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State2 = State1#{sid => ejabberd_sm:make_sid(),
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mgmt_id => MgmtID,
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mgmt_xmlns => Xmlns,
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mgmt_queue => Queue1,
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mgmt_timeout => Timeout,
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mgmt_stanzas_in => NumStanzasIn,
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@ -698,18 +700,14 @@ inherit_session_state(#{user := U, server := S,
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{error, session_copy_timed_out}
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end
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end;
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_ ->
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error ->
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{error, invalid_previd}
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end.
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-spec resume_session({erlang:timestamp(), pid()}, state()) -> {resume, state()} |
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-spec resume_session(pid(), id(), state()) -> {resume, state()} |
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{error, error_reason()}.
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resume_session({Time, Pid}, _State) ->
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ejabberd_c2s:call(Pid, {resume_session, Time}, timer:seconds(15)).
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-spec make_resume_id(state()) -> binary().
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make_resume_id(#{sid := {Time, _}, resource := Resource}) ->
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misc:term_to_base64({Resource, Time}).
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resume_session(PID, MgmtID, _State) ->
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ejabberd_c2s:call(PID, {resume_session, MgmtID}, timer:seconds(15)).
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-spec add_resent_delay_info(state(), stanza(), erlang:timestamp()) -> stanza();
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(state(), xmlel(), erlang:timestamp()) -> xmlel().
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@ -756,6 +754,24 @@ need_to_enqueue(#{mgmt_force_enqueue := true} = State, #xmlel{}) ->
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need_to_enqueue(State, _) ->
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{false, State}.
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-spec make_id() -> id().
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make_id() ->
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p1_rand:bytes(8).
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-spec encode_id(state()) -> binary().
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encode_id(#{mgmt_id := MgmtID, resource := Resource}) ->
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misc:term_to_base64({Resource, MgmtID}).
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-spec decode_id(binary()) -> {ok, {binary(), id()}} | error.
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decode_id(Encoded) ->
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case misc:base64_to_term(Encoded) of
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{term, {Resource, MgmtID}} when is_binary(Resource),
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is_binary(MgmtID) ->
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{ok, {Resource, MgmtID}};
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_ ->
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error
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end.
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%%%===================================================================
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%%% Formatters and Logging
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%%%===================================================================
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@ -803,14 +819,14 @@ cache_opts(Opts) ->
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{life_time, mod_stream_mgmt_opt:cache_life_time(Opts)},
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{type, ordered_set}].
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-spec store_stanzas_in(ljid(), erlang:timestamp(), non_neg_integer()) -> boolean().
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store_stanzas_in(LJID, Time, Num) ->
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ets_cache:insert(?STREAM_MGMT_CACHE, {LJID, Time}, Num,
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-spec store_stanzas_in(ljid(), id(), non_neg_integer()) -> boolean().
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store_stanzas_in(LJID, MgmtID, Num) ->
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ets_cache:insert(?STREAM_MGMT_CACHE, {LJID, MgmtID}, Num,
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ejabberd_cluster:get_nodes()).
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-spec pop_stanzas_in(ljid(), erlang:timestamp()) -> {ok, non_neg_integer()} | error.
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pop_stanzas_in(LJID, Time) ->
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case ets_cache:lookup(?STREAM_MGMT_CACHE, {LJID, Time}) of
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-spec pop_stanzas_in(ljid(), id()) -> {ok, non_neg_integer()} | error.
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pop_stanzas_in(LJID, MgmtID) ->
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case ets_cache:lookup(?STREAM_MGMT_CACHE, {LJID, MgmtID}) of
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{ok, Val} ->
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ets_cache:match_delete(?STREAM_MGMT_CACHE, {LJID, '_'},
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ejabberd_cluster:get_nodes()),
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