%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2010-2011. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
%%
%% Tests of traffic between seven Diameter nodes connected as follows.
%%
%% --- SERVER1.REALM2
%% /
%% ---- RELAY.REALM2 ---- SERVER2.REALM2
%% / |
%% CLIENT.REALM1 |
%% \ |
%% ---- RELAY.REALM3 ---- SERVER2.REALM3
%% \
%% --- SERVER2.REALM3
%%
-module(diameter_relay_SUITE).
-export([suite/0,
all/0,
groups/0,
init_per_group/2,
end_per_group/2,
init_per_suite/1,
end_per_suite/1]).
%% testcases
-export([send1/1,
send2/1,
send3/1,
send4/1,
send_loop/1,
send_timeout_1/1,
send_timeout_2/1,
remove_transports/1,
stop_services/1]).
%% diameter callbacks
-export([peer_up/3,
peer_down/3,
pick_peer/4,
prepare_request/3,
prepare_retransmit/3,
handle_answer/4,
handle_error/4,
handle_request/3]).
-ifdef(DIAMETER_CT).
-include("diameter_gen_base_rfc3588.hrl").
-else.
-include_lib("diameter/include/diameter_gen_base_rfc3588.hrl").
-endif.
-include_lib("diameter/include/diameter.hrl").
-include("diameter_ct.hrl").
%% ===========================================================================
-define(ADDR, {127,0,0,1}).
-define(CLIENT, "CLIENT.REALM1").
-define(RELAY1, "RELAY.REALM2").
-define(SERVER1, "SERVER1.REALM2").
-define(SERVER2, "SERVER2.REALM2").
-define(RELAY2, "RELAY.REALM3").
-define(SERVER3, "SERVER1.REALM3").
-define(SERVER4, "SERVER2.REALM3").
-define(DICT_COMMON, ?DIAMETER_DICT_COMMON).
-define(DICT_RELAY, ?DIAMETER_DICT_RELAY).
-define(APP_ALIAS, the_app).
-define(APP_ID, ?DICT_COMMON:id()).
%% Config for diameter:start_service/2.
-define(SERVICE(Host, Dict),
[{'Origin-Host', Host},
{'Origin-Realm', realm(Host)},
{'Host-IP-Address', [?ADDR]},
{'Vendor-Id', 12345},
{'Product-Name', "OTP/diameter"},
{'Acct-Application-Id', [Dict:id()]},
{application, [{alias, ?APP_ALIAS},
{dictionary, Dict},
{module, ?MODULE},
{answer_errors, callback}]}]).
%% Config for diameter:add_transport/2. In the listening case, listen
%% on a free port that we then lookup using the implementation detail
%% that diameter_tcp registers the port with diameter_reg.
-define(CONNECT(PortNr),
{connect, [{transport_module, diameter_tcp},
{transport_config, [{raddr, ?ADDR},
{rport, PortNr},
{ip, ?ADDR},
{port, 0}]}]}).
-define(LISTEN,
{listen, [{transport_module, diameter_tcp},
{transport_config, [{ip, ?ADDR}, {port, 0}]}]}).
-define(SUCCESS, 2001).
-define(LOOP_DETECTED, 3005).
-define(UNABLE_TO_DELIVER, 3002).
-define(LOGOUT, ?'DIAMETER_BASE_TERMINATION-CAUSE_DIAMETER_LOGOUT').
-define(AUTHORIZE_ONLY, ?'DIAMETER_BASE_RE-AUTH-REQUEST-TYPE_AUTHORIZE_ONLY').
-define(A, list_to_atom).
-define(L, atom_to_list).
%% ===========================================================================
suite() ->
[{timetrap, {seconds, 10}}].
all() ->
[{group, N} || {N, _, _} <- groups()]
++ [remove_transports, stop_services].
groups() ->
Ts = tc(),
[{all, [], Ts},
{p, [parallel], Ts}].
init_per_group(_, Config) ->
Config.
end_per_group(_, _) ->
ok.
init_per_suite(Config) ->
ok = diameter:start(),
dbg:tracer(port, dbg:trace_port(file, "relay.dbg")),
dbg:p(all,c),
dbg:tpl(diameter_service, x),
dbg:tp(?MODULE, x),
[S1,S2,S3,S4] = S = [server(N, ?DICT_COMMON) || N <- [?SERVER1,
?SERVER2,
?SERVER3,
?SERVER4]],
[R1,R2] = R = [server(N, ?DICT_RELAY) || N <- [?RELAY1, ?RELAY2]],
ok = diameter:start_service(?CLIENT, ?SERVICE(?CLIENT, ?DICT_COMMON)),
true = diameter:subscribe(?RELAY1),
true = diameter:subscribe(?RELAY2),
true = diameter:subscribe(?CLIENT),
[C1,C2] = connect(?RELAY1, [S1,S2]),
[C3,C4] = connect(?RELAY2, [S3,S4]),
[C5,C6] = connect(?CLIENT, [R1,R2]),
C7 = connect(?RELAY1, R2),
[{transports, {S, R, [C1,C2,C3,C4,C5,C6,C7]}} | Config].
end_per_suite(_Config) ->
ok = diameter:stop().
%% Testcases to run when services are started and connections
%% established.
tc() ->
[send1,
send2,
send3,
send4,
send_loop,
send_timeout_1,
send_timeout_2].
server(Host, Dict) ->
ok = diameter:start_service(Host, ?SERVICE(Host, Dict)),
{ok, LRef} = diameter:add_transport(Host, ?LISTEN),
{LRef, portnr(LRef)}.
connect(Host, {_LRef, PortNr}) ->
{ok, Ref} = diameter:add_transport(Host, ?CONNECT(PortNr)),
ok = receive
#diameter_event{service = Host,
info = {up, Ref, _, _, #diameter_packet{}}} ->
ok
after 2000 ->
false
end,
Ref;
connect(Host, Ports) ->
[connect(Host, P) || P <- Ports].
portnr(LRef) ->
portnr(LRef, 20).
portnr(LRef, N)
when 0 < N ->
case diameter_reg:match({diameter_tcp, listener, {LRef, '_'}}) of
[{T, _Pid}] ->
{_, _, {LRef, {_Addr, LSock}}} = T,
{ok, PortNr} = inet:port(LSock),
PortNr;
[] ->
receive after 50 -> ok end,
portnr(LRef, N-1)
end.
realm(Host) ->
tl(lists:dropwhile(fun(C) -> C /= $. end, Host)).
%% ===========================================================================
%% Send an STR intended for a specific server and expect success.
send1(_Config) ->
call(?SERVER1).
send2(_Config) ->
call(?SERVER2).
send3(_Config) ->
call(?SERVER3).
send4(_Config) ->
call(?SERVER4).
%% Send an ASR that loops between the relays and expect the loop to
%% be detected.
send_loop(_Config) ->
Req = ['ASR', {'Destination-Realm', realm(?SERVER1)},
{'Destination-Host', ?SERVER1},
{'Auth-Application-Id', ?APP_ID}],
#'diameter_base_answer-message'{'Result-Code' = ?LOOP_DETECTED}
= call(Req, [{filter, realm}]).
%% Send a RAR that is incorrectly routed and then discarded and expect
%% different results depending on whether or not we or the relay
%% timeout first.
send_timeout_1(_Config) ->
#'diameter_base_answer-message'{'Result-Code' = ?UNABLE_TO_DELIVER}
= send_timeout(7000).
send_timeout_2(_Config) ->
{error, timeout} = send_timeout(3000).
send_timeout(Tmo) ->
Req = ['RAR', {'Destination-Realm', realm(?SERVER1)},
{'Destination-Host', ?SERVER1},
{'Auth-Application-Id', ?APP_ID},
{'Re-Auth-Request-Type', ?AUTHORIZE_ONLY}],
call(Req, [{filter, realm}, {timeout, Tmo}]).
%% Remove the client transports and expect the corresponding server
%% transport to go down.
remove_transports(Config) ->
{[S1,S2,S3,S4], [R1,R2], [C1,C2,C3,C4,C5,C6,C7]}
= proplists:get_value(transports, Config),
true = diameter:subscribe(?SERVER1),
true = diameter:subscribe(?SERVER2),
true = diameter:subscribe(?SERVER3),
true = diameter:subscribe(?SERVER4),
true = diameter:subscribe(?RELAY1),
true = diameter:subscribe(?RELAY2),
disconnect(S1, ?RELAY1, C1),
disconnect(S2, ?RELAY1, C2),
disconnect(S3, ?RELAY2, C3),
disconnect(S4, ?RELAY2, C4),
disconnect(R1, ?CLIENT, C5),
disconnect(R2, ?CLIENT, C6),
disconnect(R2, ?RELAY1, C7).
disconnect({LRef, _PortNr}, Client, CRef) ->
ok = diameter:remove_transport(Client, CRef),
ok = receive #diameter_event{info = {down, LRef, _, _}} -> ok
after 2000 -> false
end.
stop_services(_Config) ->
S = [?CLIENT, ?RELAY1, ?RELAY2, ?SERVER1, ?SERVER2, ?SERVER3, ?SERVER4],
Ok = [ok || _ <- S],
Ok = [diameter:stop_service(H) || H <- S].
%% ===========================================================================
call(Server) ->
Realm = realm(Server),
Req = ['STR', {'Destination-Realm', Realm},
{'Destination-Host', [Server]},
{'Termination-Cause', ?LOGOUT},
{'Auth-Application-Id', ?APP_ID}],
#diameter_base_STA{'Result-Code' = ?SUCCESS,
'Origin-Host' = Server,
'Origin-Realm' = Realm}
= call(Req, [{filter, realm}]).
call(Req, Opts) ->
diameter:call(?CLIENT, ?APP_ALIAS, Req, Opts).
set([H|T], Vs) ->
[H | Vs ++ T].
%% ===========================================================================
%% diameter callbacks
%% peer_up/3
peer_up(_SvcName, _Peer, State) ->
State.
%% peer_down/3
peer_down(_SvcName, _Peer, State) ->
State.
%% pick_peer/4
pick_peer([Peer | _], _, Svc, _State)
when Svc == ?RELAY1;
Svc == ?RELAY2;
Svc == ?CLIENT->
{ok, Peer}.
%% prepare_request/3
prepare_request(Pkt, Svc, _Peer)
when Svc == ?RELAY1;
Svc == ?RELAY2 ->
{send, Pkt};
prepare_request(Pkt, ?CLIENT, {_Ref, Caps}) ->
{send, prepare(Pkt, Caps)}.
prepare(#diameter_packet{msg = Req}, Caps) ->
#diameter_caps{origin_host = {OH, _},
origin_realm = {OR, _}}
= Caps,
set(Req, [{'Session-Id', diameter:session_id(OH)},
{'Origin-Host', OH},
{'Origin-Realm', OR}]).
%% prepare_retransmit/3
prepare_retransmit(_Pkt, false, _Peer) ->
discard.
%% handle_answer/4
%% A relay must return Pkt.
handle_answer(Pkt, _Req, Svc, _Peer)
when Svc == ?RELAY1;
Svc == ?RELAY2 ->
Pkt;
handle_answer(Pkt, _Req, ?CLIENT, _Peer) ->
#diameter_packet{msg = Rec, errors = []} = Pkt,
Rec.
%% handle_error/4
handle_error(Reason, _Req, _Svc, _Peer) ->
{error, Reason}.
%% handle_request/3
handle_request(Pkt, OH, {_Ref, #diameter_caps{origin_host = {OH,_}} = Caps})
when OH /= ?CLIENT ->
request(Pkt, Caps).
%% RELAY1 routes any ASR or RAR to RELAY2 ...
request(#diameter_packet{header = #diameter_header{cmd_code = C}},
#diameter_caps{origin_host = {?RELAY1, _}})
when C == 274; %% ASR
C == 258 -> %% RAR
{relay, [{filter, {realm, realm(?RELAY2)}}]};
%% ... which in turn routes it back. Expect diameter to either answer
%% either with DIAMETER_LOOP_DETECTED/DIAMETER_UNABLE_TO_COMPLY.
request(#diameter_packet{header = #diameter_header{cmd_code = 274}},
#diameter_caps{origin_host = {?RELAY2, _}}) ->
{relay, [{filter, {host, ?RELAY1}}]};
request(#diameter_packet{header = #diameter_header{cmd_code = 258}},
#diameter_caps{origin_host = {?RELAY2, _}}) ->
discard;
%% Other request to a relay: send on to one of the servers in the
%% same realm.
request(_Pkt, #diameter_caps{origin_host = {OH, _}})
when OH == ?RELAY1;
OH == ?RELAY2 ->
{relay, [{filter, {all, [host, realm]}}]};
%% Request received by a server: answer.
request(#diameter_packet{msg = #diameter_base_STR{'Session-Id' = SId,
'Origin-Host' = Host,
'Origin-Realm' = Realm,
'Route-Record' = Route}},
#diameter_caps{origin_host = {OH, _},
origin_realm = {OR, _}}) ->
%% The request should have the Origin-Host/Realm of the original
%% sender.
R = realm(?CLIENT),
{?CLIENT, R} = {Host, Realm},
%% A relay appends the identity of the peer that a request was
%% received from to the Route-Record avp.
[?CLIENT] = Route,
{reply, #diameter_base_STA{'Result-Code' = ?SUCCESS,
'Session-Id' = SId,
'Origin-Host' = OH,
'Origin-Realm' = OR}}.
