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authorRaimo Niskanen <[email protected]>2017-11-29 11:20:17 +0100
committerRaimo Niskanen <[email protected]>2017-12-04 13:56:30 +0100
commite6be253c9968f71038347b25a157c1c01080e95f (patch)
tree59f745bb4efc222c8ab7cb09edcfe6f951cc61cd /lib/ssl/src
parent057155088f14e111791489a50d25de67065b16ba (diff)
downloadotp-e6be253c9968f71038347b25a157c1c01080e95f.tar.gz
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Polish SSL distribution
Diffstat (limited to 'lib/ssl/src')
-rw-r--r--lib/ssl/src/dtls_connection.erl9
-rw-r--r--lib/ssl/src/inet_tls_dist.erl47
-rw-r--r--lib/ssl/src/ssl_connection.erl141
-rw-r--r--lib/ssl/src/tls_connection.erl9
4 files changed, 118 insertions, 88 deletions
diff --git a/lib/ssl/src/dtls_connection.erl b/lib/ssl/src/dtls_connection.erl
index 073cb4009b..e5760e7951 100644
--- a/lib/ssl/src/dtls_connection.erl
+++ b/lib/ssl/src/dtls_connection.erl
@@ -467,7 +467,8 @@ init(Type, Event, State) ->
error(enter, _, State) ->
{keep_state, State};
error({call, From}, {start, _Timeout}, {Error, State}) ->
- {stop_and_reply, normal, {reply, From, {error, Error}}, State};
+ ssl_connection:stop_and_reply(
+ normal, {reply, From, {error, Error}}, State);
error({call, _} = Call, Msg, State) ->
gen_handshake(?FUNCTION_NAME, Call, Msg, State);
error(_, _, _) ->
@@ -821,7 +822,7 @@ handle_info({Protocol, _, _, _, Data}, StateName,
next_event(StateName, Record, State);
#alert{} = Alert ->
ssl_connection:handle_normal_shutdown(Alert, StateName, State0),
- {stop, {shutdown, own_alert}}
+ ssl_connection:stop({shutdown, own_alert}, State0)
end;
handle_info({CloseTag, Socket}, StateName,
#state{socket = Socket,
@@ -846,7 +847,7 @@ handle_info({CloseTag, Socket}, StateName,
ok
end,
ssl_connection:handle_normal_shutdown(?ALERT_REC(?FATAL, ?CLOSE_NOTIFY), StateName, State),
- {stop, {shutdown, transport_closed}};
+ ssl_connection:stop({shutdown, transport_closed}, State);
true ->
%% Fixes non-delivery of final DTLS record in {active, once}.
%% Basically allows the application the opportunity to set {active, once} again
@@ -872,7 +873,7 @@ handle_state_timeout(flight_retransmission_timeout, StateName,
handle_alerts([], Result) ->
Result;
-handle_alerts(_, {stop,_} = Stop) ->
+handle_alerts(_, {stop, _, _} = Stop) ->
Stop;
handle_alerts([Alert | Alerts], {next_state, StateName, State}) ->
handle_alerts(Alerts, ssl_connection:handle_alert(Alert, StateName, State));
diff --git a/lib/ssl/src/inet_tls_dist.erl b/lib/ssl/src/inet_tls_dist.erl
index 639ae43131..8e605bec65 100644
--- a/lib/ssl/src/inet_tls_dist.erl
+++ b/lib/ssl/src/inet_tls_dist.erl
@@ -324,12 +324,13 @@ do_accept(Driver, Kernel, AcceptPid, DistCtrl, MyNode, Allowed, SetupTime) ->
timer = Timer,
this_flags = 0,
allowed = Allowed},
+ link(DistCtrl),
dist_util:handshake_other_started(trace(HSData));
{false,IP} ->
error_logger:error_msg(
"** Connection attempt from "
"disallowed IP ~w ** ~n", [IP]),
- ?shutdown(trace(no_node))
+ ?shutdown2(no_node, trace({disallowed, IP}))
end
end.
@@ -382,21 +383,26 @@ do_setup(Driver, Kernel, Node, Type, MyNode, LongOrShortNames, SetupTime) ->
this_flags = 0,
other_version = Version,
request_type = Type},
+ link(DistCtrl),
dist_util:handshake_we_started(trace(HSData));
Other ->
%% Other Node may have closed since
%% port_please !
?shutdown2(
Node,
- trace({shutdown, {connect_failed, Other}}))
+ trace(
+ {ssl_connect_failed, Ip, TcpPort, Other}))
end;
Other ->
?shutdown2(
Node,
- trace({shutdown, {port_please_failed, Other}}))
+ trace(
+ {port_please_failed, ErlEpmd, Name, Ip, Other}))
end;
Other ->
- ?shutdown2(Node, trace({shutdown, {getaddr_failed, Other}}))
+ ?shutdown2(
+ Node,
+ trace({getaddr_failed, Driver, Address, Other}))
end.
close(Socket) ->
@@ -415,8 +421,9 @@ check_ip(Driver, SslSocket) ->
case get_ifs(SslSocket) of
{ok, IFs, IP} ->
check_ip(Driver, IFs, IP);
- _ ->
- ?shutdown(no_node)
+ Other ->
+ ?shutdown2(
+ no_node, trace({check_ip_failed, SslSocket, Other}))
end;
_ ->
true
@@ -445,23 +452,22 @@ get_ifs(#sslsocket{fd = {gen_tcp, Socket, _}}) ->
%% If Node is illegal terminate the connection setup!!
splitnode(Driver, Node, LongOrShortNames) ->
- case split_node(atom_to_list(Node), $@, []) of
- [Name|Tail] when Tail =/= [] ->
- Host = lists:append(Tail),
+ case string:split(atom_to_list(Node), "@") of
+ [Name, Host] when Host =/= [] ->
check_node(Driver, Name, Node, Host, LongOrShortNames);
[_] ->
error_logger:error_msg(
"** Nodename ~p illegal, no '@' character **~n",
[Node]),
- ?shutdown(Node);
+ ?shutdown2(Node, trace({illegal_node_n@me, Node}));
_ ->
error_logger:error_msg(
"** Nodename ~p illegal **~n", [Node]),
- ?shutdown(Node)
+ ?shutdown2(Node, trace({illegal_node_name, Node}))
end.
check_node(Driver, Name, Node, Host, LongOrShortNames) ->
- case split_node(Host, $., []) of
+ case string:split(Host, ".") of
[_] when LongOrShortNames == longnames ->
case Driver:parse_address(Host) of
{ok, _} ->
@@ -472,35 +478,28 @@ check_node(Driver, Name, Node, Host, LongOrShortNames) ->
"fully qualified hostnames **~n"
"** Hostname ~s is illegal **~n",
[Host]),
- ?shutdown(Node)
+ ?shutdown2(Node, trace({not_longnames, Host}))
end;
- [_, _ | _] when LongOrShortNames == shortnames ->
+ [_, _] when LongOrShortNames == shortnames ->
error_logger:error_msg(
"** System NOT running to use "
"fully qualified hostnames **~n"
"** Hostname ~s is illegal **~n",
[Host]),
- ?shutdown(Node);
+ ?shutdown2(Node, trace({not_shortnames, Host}));
_ ->
[Name, Host]
end.
split_node(Node) when is_atom(Node) ->
- case split_node(atom_to_list(Node), $@, []) of
- [_, Host] ->
+ case string:split(atom_to_list(Node), "@") of
+ [Name, Host] when Name =/= [], Host =/= [] ->
Host;
_ ->
false
end;
split_node(_) ->
false.
-%%
-split_node([Chr|T], Chr, Ack) ->
- [lists:reverse(Ack)|split_node(T, Chr, [])];
-split_node([H|T], Chr, Ack) ->
- split_node(T, Chr, [H|Ack]);
-split_node([], _, Ack) ->
- [lists:reverse(Ack)].
%% -------------------------------------------------------------------------
diff --git a/lib/ssl/src/ssl_connection.erl b/lib/ssl/src/ssl_connection.erl
index ef64388361..9f5f2df3ea 100644
--- a/lib/ssl/src/ssl_connection.erl
+++ b/lib/ssl/src/ssl_connection.erl
@@ -49,7 +49,7 @@
%% Alert and close handling
-export([handle_own_alert/4, handle_alert/3,
- handle_normal_shutdown/3
+ handle_normal_shutdown/3, stop/2, stop_and_reply/3
]).
%% Data handling
@@ -316,7 +316,7 @@ handle_own_alert(Alert, Version, StateName,
catch _:_ ->
ok
end,
- {stop, {shutdown, own_alert}}.
+ stop({shutdown, own_alert}, State).
handle_normal_shutdown(Alert, _, #state{socket = Socket,
transport_cb = Transport,
@@ -340,24 +340,24 @@ handle_alert(#alert{level = ?FATAL} = Alert, StateName,
protocol_cb = Connection,
ssl_options = SslOpts, start_or_recv_from = From, host = Host,
port = Port, session = Session, user_application = {_Mon, Pid},
- role = Role, socket_options = Opts, tracker = Tracker}) ->
+ role = Role, socket_options = Opts, tracker = Tracker} = State) ->
invalidate_session(Role, Host, Port, Session),
log_alert(SslOpts#ssl_options.log_alert, Role, Connection:protocol_name(),
StateName, Alert#alert{role = opposite_role(Role)}),
alert_user(Transport, Tracker, Socket, StateName, Opts, Pid, From, Alert, Role, Connection),
- {stop, normal};
+ stop(normal, State);
handle_alert(#alert{level = ?WARNING, description = ?CLOSE_NOTIFY} = Alert,
StateName, State) ->
handle_normal_shutdown(Alert, StateName, State),
- {stop, {shutdown, peer_close}};
+ stop({shutdown, peer_close}, State);
handle_alert(#alert{level = ?WARNING, description = ?NO_RENEGOTIATION} = Alert, StateName,
#state{role = Role, ssl_options = SslOpts, protocol_cb = Connection, renegotiation = {true, internal}} = State) ->
log_alert(SslOpts#ssl_options.log_alert, Role,
Connection:protocol_name(), StateName, Alert#alert{role = opposite_role(Role)}),
handle_normal_shutdown(Alert, StateName, State),
- {stop, {shutdown, peer_close}};
+ stop({shutdown, peer_close}, State);
handle_alert(#alert{level = ?WARNING, description = ?NO_RENEGOTIATION} = Alert, StateName,
#state{role = Role,
@@ -404,7 +404,7 @@ write_application_data(Data0, {FromPid, _} = From,
ok when FromPid =:= self() ->
hibernate_after(connection, NewState, []);
Error when FromPid =:= self() ->
- {stop, {shutdown, Error}, NewState};
+ stop({shutdown, Error}, NewState);
ok ->
hibernate_after(connection, NewState, [{reply, From, ok}]);
Result ->
@@ -446,8 +446,8 @@ read_application_data(Data, #state{user_application = {_Mon, Pid},
Connection:next_record_if_active(State);
_ -> %% We have more data
read_application_data(<<>>, State)
- catch _:Reason ->
- death_row(State, Reason)
+ catch error:_ ->
+ death_row(State, disconnect)
end;
_ ->
SocketOpt =
@@ -479,7 +479,7 @@ read_application_data(Data, #state{user_application = {_Mon, Pid},
Connection:next_record_if_active(State0#state{user_data_buffer = Buffer});
{error,_Reason} -> %% Invalid packet in packet mode
deliver_packet_error(Transport, Socket, SOpts, Buffer1, Pid, RecvFrom, Tracker, Connection),
- stop_normal(State0)
+ stop(normal, State0)
end.
%%====================================================================
%% Help functions for tls|dtls_connection.erl
@@ -581,7 +581,7 @@ init({call, From}, {start, {Opts, EmOpts}, Timeout},
init({call, From}, {start, Timeout},
State#state{ssl_options = SslOpts, socket_options = new_emulated(EmOpts, SockOpts)}, Connection)
catch throw:Error ->
- {stop_and_reply, normal, {reply, From, {error, Error}}}
+ stop_and_reply(normal, {reply, From, {error, Error}}, State0)
end;
init({call, From}, Msg, State, Connection) ->
handle_call(Msg, From, ?FUNCTION_NAME, State, Connection);
@@ -966,7 +966,7 @@ connection({call, {FromPid, _} = From}, {application_data, Data},
catch throw:Error ->
case self() of
FromPid ->
- {stop, {shutdown, Error}};
+ stop({shutdown, Error}, State);
_ ->
hibernate_after(
?FUNCTION_NAME, State, [{reply, From, Error}])
@@ -1017,8 +1017,8 @@ connection(
ProtocolSpecific#{d_handle => DHandle}},
{Record, NewerState} = Connection:next_record_if_active(NewState),
Connection:next_event(connection, Record, NewerState, [{reply, From, ok}])
- catch _:Reason ->
- death_row(State, Reason)
+ catch error:_ ->
+ death_row(State, disconnect)
end;
connection({call, From}, Msg, State, Connection) ->
handle_call(Msg, From, ?FUNCTION_NAME, State, Connection);
@@ -1030,8 +1030,8 @@ connection(
_) ->
eat_msgs(Msg),
try send_dist_data(?FUNCTION_NAME, State, DHandle, [])
- catch _:Reason ->
- death_row(State, Reason)
+ catch error:_ ->
+ death_row(State, disconnect)
end;
connection(
info, {send, From, Ref, Data},
@@ -1072,20 +1072,22 @@ connection(Type, Msg, State, Connection) ->
%% or the socket may die too
death_row(
info, {'DOWN', MonitorRef, _, _, Reason},
- #state{user_application={MonitorRef,_Pid} = State},
+ #state{user_application={MonitorRef,_Pid}},
_) ->
- {stop, {shutdown, Reason}, State};
+ {stop, {shutdown, Reason}};
death_row(
- info, {'EXIT', Socket, Reason}, #state{socket = Socket} = State, _) ->
- {stop, {shutdown, Reason}, State};
+ info, {'EXIT', Socket, Reason}, #state{socket = Socket}, _) ->
+ {stop, {shutdown, Reason}};
death_row(state_timeout, Reason, _State, _Connection) ->
{stop, {shutdown,Reason}};
-death_row(_Type, _Msg, State, _Connection) ->
- {keep_state, State, [postpone]}.
+death_row(_Type, _Msg, _State, _Connection) ->
+ %% Waste all other events
+ keep_state_and_data.
%% State entry function
death_row(State, Reason) ->
- {next_state, death_row, State, [{state_timeout, 5000, Reason}]}.
+ {next_state, death_row, State,
+ [{state_timeout, 5000, Reason}]}.
%%--------------------------------------------------------------------
-spec downgrade(gen_statem:event_type(), term(),
@@ -1098,10 +1100,10 @@ downgrade(internal, #alert{description = ?CLOSE_NOTIFY},
tls_socket:setopts(Transport, Socket, [{active, false}, {packet, 0}, {mode, binary}]),
Transport:controlling_process(Socket, Pid),
gen_statem:reply(From, {ok, Socket}),
- stop_normal(State);
+ stop(normal, State);
downgrade(timeout, downgrade, #state{downgrade = {_, From}} = State, _) ->
gen_statem:reply(From, {error, timeout}),
- stop_normal(State);
+ stop(normal, State);
downgrade(Type, Event, State, Connection) ->
handle_common_event(Type, Event, ?FUNCTION_NAME, State, Connection).
@@ -1116,7 +1118,7 @@ handle_common_event(internal, {handshake, {#hello_request{} = Handshake, _}}, co
handle_common_event(internal, {handshake, {#hello_request{}, _}}, StateName, #state{role = client}, _)
when StateName =/= connection ->
{keep_state_and_data};
-handle_common_event(internal, {handshake, {Handshake, Raw}}, StateName,
+handle_common_event(internal, {handshake, {Handshake, Raw}}, StateName,
#state{tls_handshake_history = Hs0,
ssl_options = #ssl_options{v2_hello_compatible = V2HComp}} = State0,
Connection) ->
@@ -1135,8 +1137,8 @@ handle_common_event(timeout, hibernate, _, _, _) ->
{keep_state_and_data, [hibernate]};
handle_common_event(internal, {application_data, Data}, StateName, State0, Connection) ->
case read_application_data(Data, State0) of
- {stop, Reason, State} ->
- {stop, Reason, State};
+ {stop, _, _} = Stop->
+ Stop;
{Record, State} ->
Connection:next_event(StateName, Record, State)
end;
@@ -1165,8 +1167,9 @@ handle_call({close, _} = Close, From, StateName, State, Connection) ->
%% Run terminate before returning so that the reuseaddr
%% inet-option works properly
Result = Connection:terminate(Close, StateName, State#state{terminated = true}),
- {stop_and_reply, {shutdown, normal},
- {reply, From, Result}, State};
+ stop_and_reply(
+ {shutdown, normal},
+ {reply, From, Result}, State);
handle_call({shutdown, How0}, From, _,
#state{transport_cb = Transport,
negotiated_version = Version,
@@ -1187,7 +1190,7 @@ handle_call({shutdown, How0}, From, _,
{keep_state_and_data, [{reply, From, ok}]};
Error ->
gen_statem:reply(From, {error, Error}),
- stop_normal(State)
+ stop(normal, State)
end;
handle_call({recv, _N, _Timeout}, From, _,
#state{socket_options =
@@ -1267,33 +1270,50 @@ handle_info({ErrorTag, Socket, econnaborted}, StateName,
tracker = Tracker} = State) when StateName =/= connection ->
alert_user(Transport, Tracker,Socket,
StartFrom, ?ALERT_REC(?FATAL, ?CLOSE_NOTIFY), Role, Connection),
- stop_normal(State);
+ stop(normal, State);
handle_info({ErrorTag, Socket, Reason}, StateName, #state{socket = Socket,
error_tag = ErrorTag} = State) ->
Report = io_lib:format("SSL: Socket error: ~p ~n", [Reason]),
error_logger:error_report(Report),
handle_normal_shutdown(?ALERT_REC(?FATAL, ?CLOSE_NOTIFY), StateName, State),
- stop_normal(State);
+ stop(normal, State);
handle_info(
+ {'DOWN', MonitorRef, _, _, Reason}, _,
+ #state{
+ user_application = {MonitorRef, _Pid},
+ ssl_options = #ssl_options{erl_dist = true}}) ->
+ {stop, {shutdown, Reason}};
+handle_info(
{'DOWN', MonitorRef, _, _, _}, _,
- #state{user_application={MonitorRef,_Pid}} = State) ->
- stop_normal(State);
+ #state{user_application = {MonitorRef, _Pid}}) ->
+ {stop, normal};
+handle_info(
+ {'EXIT', Pid, _Reason}, StateName,
+ #state{user_application = {_MonitorRef, Pid}} = State) ->
+ %% It seems the user application has linked to us
+ %% - ignore that and let the monitor handle this
+ {next_state, StateName, State};
+
%%% So that terminate will be run when supervisor issues shutdown
handle_info({'EXIT', _Sup, shutdown}, _StateName, State) ->
- {stop, shutdown, State};
+ stop(shutdown, State);
handle_info({'EXIT', Socket, normal}, _StateName, #state{socket = Socket} = State) ->
%% Handle as transport close"
- {stop, {shutdown, transport_closed}, State};
+ stop({shutdown, transport_closed}, State);
handle_info({'EXIT', Socket, Reason}, _StateName, #state{socket = Socket} = State) ->
- {stop, {shutdown, Reason}, State};
+ stop({shutdown, Reason}, State);
+
handle_info(allow_renegotiate, StateName, State) ->
{next_state, StateName, State#state{allow_renegotiate = true}};
+
handle_info({cancel_start_or_recv, StartFrom}, StateName,
#state{renegotiation = {false, first}} = State) when StateName =/= connection ->
- {stop_and_reply, {shutdown, user_timeout},
- {reply, StartFrom, {error, timeout}}, State#state{timer = undefined}};
+ stop_and_reply(
+ {shutdown, user_timeout},
+ {reply, StartFrom, {error, timeout}},
+ State#state{timer = undefined});
handle_info({cancel_start_or_recv, RecvFrom}, StateName,
#state{start_or_recv_from = RecvFrom} = State) when RecvFrom =/= undefined ->
{next_state, StateName, State#state{start_or_recv_from = undefined,
@@ -2437,8 +2457,8 @@ handle_active_option(_, connection = StateName0, To, Reply, #state{protocol_cb =
hibernate_after(StateName, State, [{reply, To, Reply}]);
{next_state, StateName, State, Actions} ->
hibernate_after(StateName, State, [{reply, To, Reply} | Actions]);
- {stop, Reason, State} ->
- {stop, Reason, State}
+ {stop, _, _} = Stop ->
+ Stop
end;
handle_active_option(_, StateName, To, Reply, #state{user_data_buffer = <<>>} = State) ->
%% Active once already set
@@ -2447,8 +2467,8 @@ handle_active_option(_, StateName, To, Reply, #state{user_data_buffer = <<>>} =
%% user_data_buffer =/= <<>>
handle_active_option(_, StateName0, To, Reply, #state{protocol_cb = Connection} = State0) ->
case read_application_data(<<>>, State0) of
- {stop, Reason, State} ->
- {stop, Reason, State};
+ {stop, _, _} = Stop ->
+ Stop;
{Record, State1} ->
%% Note: Renogotiation may cause StateName0 =/= StateName
case Connection:next_event(StateName0, Record, State1) of
@@ -2606,7 +2626,8 @@ send_or_reply(_, Pid, _From, Data) ->
send_user(Pid, Data).
send_user(Pid, Msg) ->
- Pid ! Msg.
+ Pid ! Msg,
+ ok.
alert_user(Transport, Tracker, Socket, connection, Opts, Pid, From, Alert, Role, Connection) ->
alert_user(Transport, Tracker, Socket, Opts#socket_options.active, Pid, From, Alert, Role, Connection);
@@ -2719,14 +2740,22 @@ eat_msgs(Msg) ->
after 0 -> ok
end.
-%% When running with erl_dist the stop reason 'normal'
-%% would be too silent and prevent cleanup
-stop_normal(State) ->
- Reason =
- case State of
- #state{ssl_options = #ssl_options{erl_dist = true}} ->
- {shutdown, normal};
- _ ->
- normal
- end,
- {stop, Reason, State}.
+%% When acting as distribution controller map the exit reason
+%% to follow the documented nodedown_reason for net_kernel
+stop(Reason, State) ->
+ {stop, erl_dist_stop_reason(Reason, State), State}.
+
+stop_and_reply(Reason, Replies, State) ->
+ {stop_and_reply, erl_dist_stop_reason(Reason, State), Replies, State}.
+
+erl_dist_stop_reason(
+ Reason, #state{ssl_options = #ssl_options{erl_dist = true}}) ->
+ case Reason of
+ normal ->
+ %% We can not exit with normal since that will not bring
+ %% down the rest of the distribution processes
+ {shutdown, normal};
+ _ -> Reason
+ end;
+erl_dist_stop_reason(Reason, _State) ->
+ Reason.
diff --git a/lib/ssl/src/tls_connection.erl b/lib/ssl/src/tls_connection.erl
index 50284d19af..ddc3d4f61f 100644
--- a/lib/ssl/src/tls_connection.erl
+++ b/lib/ssl/src/tls_connection.erl
@@ -440,7 +440,8 @@ init(Type, Event, State) ->
%%--------------------------------------------------------------------
error({call, From}, {start, _Timeout}, {Error, State}) ->
- {stop_and_reply, normal, {reply, From, {error, Error}}, State};
+ ssl_connection:stop_and_reply(
+ normal, {reply, From, {error, Error}}, State);
error({call, _} = Call, Msg, State) ->
gen_handshake(?FUNCTION_NAME, Call, Msg, State);
error(_, _, _) ->
@@ -662,7 +663,7 @@ handle_info({Protocol, _, Data}, StateName,
next_event(StateName, Record, State);
#alert{} = Alert ->
ssl_connection:handle_normal_shutdown(Alert, StateName, State0),
- {stop, {shutdown, own_alert}}
+ ssl_connection:stop({shutdown, own_alert}, State0)
end;
handle_info({CloseTag, Socket}, StateName,
#state{socket = Socket, close_tag = CloseTag,
@@ -689,7 +690,7 @@ handle_info({CloseTag, Socket}, StateName,
end,
ssl_connection:handle_normal_shutdown(?ALERT_REC(?FATAL, ?CLOSE_NOTIFY), StateName, State),
- {stop, {shutdown, transport_closed}};
+ ssl_connection:stop({shutdown, transport_closed}, State);
true ->
%% Fixes non-delivery of final TLS record in {active, once}.
%% Basically allows the application the opportunity to set {active, once} again
@@ -701,7 +702,7 @@ handle_info(Msg, StateName, State) ->
handle_alerts([], Result) ->
Result;
-handle_alerts(_, {stop,_} = Stop) ->
+handle_alerts(_, {stop, _, _} = Stop) ->
Stop;
handle_alerts([Alert | Alerts], {next_state, StateName, State}) ->
handle_alerts(Alerts, ssl_connection:handle_alert(Alert, StateName, State));