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authorAnders Svensson <[email protected]>2013-02-12 12:52:05 +0100
committerAnders Svensson <[email protected]>2013-02-12 12:52:05 +0100
commit117005a3ad1ddfd82891c13e65953dc8db9ae0d9 (patch)
treed94a93ddcb84e76ad6d01bfbe89b8901ea7043f5 /lib/diameter/src/base
parent1e7b3534eeea4761bb45ff31bcdaf57cd66a7cb7 (diff)
parent05a6cc1c996acb8e8dfe168cb029b2a7a4fdbc3d (diff)
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Merge branch 'anders/diameter/rfc6733_dictionaries/OTP-10760'
* anders/diameter/rfc6733_dictionaries/OTP-10760: Remove trailing whitespace Tweak service interface towards diameter_peer Split message handling in diameter_service into diameter_traffic Simplify request record Move failover out of service process Update traffic suite to test both RFC 3588 and 6733 dictionaries Update capx suite to test both RFC 3588 and 6733 dictionaries Add exprecs '#new-'/1 clause taking list argument Add exprecs '#get-'/1 for transforming records into lists Document the existence of the RFC 6733 dictionaries Don't hardcode common dictionary Add RFC 6733 dictionaries
Diffstat (limited to 'lib/diameter/src/base')
-rw-r--r--lib/diameter/src/base/diameter.erl4
-rw-r--r--lib/diameter/src/base/diameter_capx.erl145
-rw-r--r--lib/diameter/src/base/diameter_codec.erl57
-rw-r--r--lib/diameter/src/base/diameter_config.erl49
-rw-r--r--lib/diameter/src/base/diameter_internal.hrl4
-rw-r--r--lib/diameter/src/base/diameter_peer.erl11
-rw-r--r--lib/diameter/src/base/diameter_peer_fsm.erl114
-rw-r--r--lib/diameter/src/base/diameter_service.erl2121
-rw-r--r--lib/diameter/src/base/diameter_stats.erl4
-rw-r--r--lib/diameter/src/base/diameter_traffic.erl1633
-rw-r--r--lib/diameter/src/base/diameter_watchdog.erl99
11 files changed, 2241 insertions, 2000 deletions
diff --git a/lib/diameter/src/base/diameter.erl b/lib/diameter/src/base/diameter.erl
index 8f9901907a..6be544e950 100644
--- a/lib/diameter/src/base/diameter.erl
+++ b/lib/diameter/src/base/diameter.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 2010-2012. All Rights Reserved.
+%% Copyright Ericsson AB 2010-2013. 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
@@ -213,7 +213,7 @@ origin_state_id() ->
-> any().
call(SvcName, App, Message, Options) ->
- diameter_service:call(SvcName, {alias, App}, Message, Options).
+ diameter_traffic:send_request(SvcName, {alias, App}, Message, Options).
call(SvcName, App, Message) ->
call(SvcName, App, Message, []).
diff --git a/lib/diameter/src/base/diameter_capx.erl b/lib/diameter/src/base/diameter_capx.erl
index c6c3d2934d..715b15628c 100644
--- a/lib/diameter/src/base/diameter_capx.erl
+++ b/lib/diameter/src/base/diameter_capx.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 2010-2012. All Rights Reserved.
+%% Copyright Ericsson AB 2010-2013. 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
@@ -47,14 +47,13 @@
-module(diameter_capx).
--export([build_CER/1,
- recv_CER/2,
- recv_CEA/2,
+-export([build_CER/2,
+ recv_CER/3,
+ recv_CEA/3,
make_caps/2]).
-include_lib("diameter/include/diameter.hrl").
-include("diameter_internal.hrl").
--include("diameter_gen_base_rfc3588.hrl").
-define(SUCCESS, 2001). %% DIAMETER_SUCCESS
-define(NOAPP, 5010). %% DIAMETER_NO_COMMON_APPLICATION
@@ -67,27 +66,31 @@
-type tried(T) :: {ok, T} | {error, {term(), list()}}.
--spec build_CER(#diameter_caps{})
- -> tried(#diameter_base_CER{}).
+-spec build_CER(#diameter_caps{}, module())
+ -> tried(CER)
+ when CER :: tuple().
-build_CER(Caps) ->
- try_it([fun bCER/1, Caps]).
+build_CER(Caps, Dict) ->
+ try_it([fun bCER/2, Caps, Dict]).
--spec recv_CER(#diameter_base_CER{}, #diameter_service{})
+-spec recv_CER(CER, #diameter_service{}, module())
-> tried({[diameter:'Unsigned32'()],
#diameter_caps{},
- #diameter_base_CEA{}}).
+ CEA})
+ when CER :: tuple(),
+ CEA :: tuple().
-recv_CER(CER, Svc) ->
- try_it([fun rCER/2, CER, Svc]).
+recv_CER(CER, Svc, Dict) ->
+ try_it([fun rCER/3, CER, Svc, Dict]).
--spec recv_CEA(#diameter_base_CEA{}, #diameter_service{})
+-spec recv_CEA(CEA, #diameter_service{}, module())
-> tried({[diameter:'Unsigned32'()],
[diameter:'Unsigned32'()],
- #diameter_caps{}}).
+ #diameter_caps{}})
+ when CEA :: tuple().
-recv_CEA(CEA, Svc) ->
- try_it([fun rCEA/2, CEA, Svc]).
+recv_CEA(CEA, Svc, Dict) ->
+ try_it([fun rCEA/3, CEA, Svc, Dict]).
make_caps(Caps, Opts) ->
try_it([fun mk_caps/2, Caps, Opts]).
@@ -161,16 +164,17 @@ ipaddr(A) ->
?THROW(T)
end.
-%% bCER/1
+%% bCER/2
%%
%% Build a CER record to send to a remote peer.
%% Use the fact that diameter_caps has the same field names as CER.
-bCER(#diameter_caps{} = Rec) ->
- #diameter_base_CER{}
- = list_to_tuple([diameter_base_CER | tl(tuple_to_list(Rec))]).
+bCER(#diameter_caps{} = Rec, Dict) ->
+ Values = lists:zip(Dict:'#info-'(diameter_base_CER, fields),
+ tl(tuple_to_list(Rec))),
+ Dict:'#new-'(diameter_base_CER, Values).
-%% rCER/2
+%% rCER/3
%%
%% Build a CEA record to send to a remote peer in response to an
%% incoming CER. RFC 3588 gives no guidance on what should be sent
@@ -214,12 +218,9 @@ bCER(#diameter_caps{} = Rec) ->
%% TLS 1
%% This node supports TLS security, as defined by [TLS].
-rCER(CER, #diameter_service{capabilities = LCaps} = Svc) ->
- #diameter_base_CEA{}
- = CEA
- = cea_from_cer(bCER(LCaps)),
-
- RCaps = capx_to_caps(CER),
+rCER(CER, #diameter_service{capabilities = LCaps} = Svc, Dict) ->
+ CEA = cea_from_cer(bCER(LCaps, Dict), Dict),
+ RCaps = capx_to_caps(CER, Dict),
SApps = common_applications(LCaps, RCaps, Svc),
{SApps,
@@ -227,17 +228,18 @@ rCER(CER, #diameter_service{capabilities = LCaps} = Svc) ->
build_CEA(SApps,
LCaps,
RCaps,
- CEA#diameter_base_CEA{'Result-Code' = ?SUCCESS})}.
+ Dict,
+ Dict:'#set-'({'Result-Code', ?SUCCESS}, CEA))}.
-build_CEA([], _, _, CEA) ->
- CEA#diameter_base_CEA{'Result-Code' = ?NOAPP};
+build_CEA([], _, _, Dict, CEA) ->
+ Dict:'#set-'({'Result-Code', ?NOAPP}, CEA);
-build_CEA(_, LCaps, RCaps, CEA) ->
+build_CEA(_, LCaps, RCaps, Dict, CEA) ->
case common_security(LCaps, RCaps) of
[] ->
- CEA#diameter_base_CEA{'Result-Code' = ?NOSECURITY};
+ Dict:'#set-'({'Result-Code', ?NOSECURITY}, CEA);
[_] = IS ->
- CEA#diameter_base_CEA{'Inband-Security-Id' = IS}
+ Dict:'#set-'({'Inband-Security-Id', IS}, CEA)
end.
%% common_security/2
@@ -275,46 +277,41 @@ cs(LS, RS) ->
%% practice something there may be a need for more synchronization
%% than notification by way of an event subscription offers.
-%% cea_from_cer/1
+%% cea_from_cer/2
%% CER is a subset of CEA, the latter adding Result-Code and a few
%% more AVP's.
-cea_from_cer(#diameter_base_CER{} = CER) ->
- lists:foldl(fun(F,A) -> to_cea(CER, F, A) end,
- #diameter_base_CEA{},
- record_info(fields, diameter_base_CER)).
-
-to_cea(CER, Field, CEA) ->
- try ?BASE:'#get-'(Field, CER) of
- V -> ?BASE:'#set-'({Field, V}, CEA)
- catch
- error: _ -> CEA
- end.
-
-%% rCEA/2
+cea_from_cer(CER, Dict) ->
+ [diameter_base_CER | Values] = Dict:'#get-'(CER),
+ Dict:'#set-'(Values, Dict:'#new-'(diameter_base_CEA)).
-rCEA(CEA, #diameter_service{capabilities = LCaps} = Svc) ->
- RCaps = capx_to_caps(CEA),
+%% rCEA/3
+
+rCEA(CEA, #diameter_service{capabilities = LCaps} = Svc, Dict) ->
+ RCaps = capx_to_caps(CEA, Dict),
SApps = common_applications(LCaps, RCaps, Svc),
IS = common_security(LCaps, RCaps),
{SApps, IS, RCaps}.
-%% capx_to_caps/1
-
-capx_to_caps(#diameter_base_CEA{'Origin-Host' = OH,
- 'Origin-Realm' = OR,
- 'Host-IP-Address' = IP,
- 'Vendor-Id' = VId,
- 'Product-Name' = PN,
- 'Origin-State-Id' = OSI,
- 'Supported-Vendor-Id' = SV,
- 'Auth-Application-Id' = Auth,
- 'Inband-Security-Id' = IS,
- 'Acct-Application-Id' = Acct,
- 'Vendor-Specific-Application-Id' = VSA,
- 'Firmware-Revision' = FR,
- 'AVP' = X}) ->
+%% capx_to_caps/2
+
+capx_to_caps(CEX, Dict) ->
+ [OH, OR, IP, VId, PN, OSI, SV, Auth, IS, Acct, VSA, FR, X]
+ = Dict:'#get-'(['Origin-Host',
+ 'Origin-Realm',
+ 'Host-IP-Address',
+ 'Vendor-Id',
+ 'Product-Name',
+ 'Origin-State-Id',
+ 'Supported-Vendor-Id',
+ 'Auth-Application-Id',
+ 'Inband-Security-Id',
+ 'Acct-Application-Id',
+ 'Vendor-Specific-Application-Id',
+ 'Firmware-Revision',
+ 'AVP'],
+ CEX),
#diameter_caps{origin_host = OH,
origin_realm = OR,
vendor_id = VId,
@@ -327,10 +324,7 @@ capx_to_caps(#diameter_base_CEA{'Origin-Host' = OH,
acct_application_id = Acct,
vendor_specific_application_id = VSA,
firmware_revision = FR,
- avp = X};
-
-capx_to_caps(#diameter_base_CER{} = CER) ->
- capx_to_caps(cea_from_cer(CER)).
+ avp = X}.
%% ---------------------------------------------------------------------------
%% ---------------------------------------------------------------------------
@@ -365,13 +359,12 @@ app_union(#diameter_caps{auth_application_id = U,
vendor_specific_application_id = V}) ->
set_list(U ++ C ++ lists:flatmap(fun vsa_apps/1, V)).
-vsa_apps(#'diameter_base_Vendor-Specific-Application-Id'
- {'Auth-Application-Id' = U,
- 'Acct-Application-Id' = C}) ->
- U ++ C;
-vsa_apps(L) ->
- Rec = ?BASE:'#new-'('diameter_base_Vendor-Specific-Application-Id', L),
- vsa_apps(Rec).
+vsa_apps([_ | [_,_] = Ids]) ->
+ lists:append(Ids);
+vsa_apps(Rec)
+ when is_tuple(Rec) ->
+ [_|T] = tuple_to_list(Rec),
+ vsa_apps(T).
%% It's a configuration error for a locally advertised application not
%% to be represented in Apps. Don't just match on lists:keyfind/3 in
diff --git a/lib/diameter/src/base/diameter_codec.erl b/lib/diameter/src/base/diameter_codec.erl
index 0b0bfe3f0a..e446a0209c 100644
--- a/lib/diameter/src/base/diameter_codec.erl
+++ b/lib/diameter/src/base/diameter_codec.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 2010-2012. All Rights Reserved.
+%% Copyright Ericsson AB 2010-2013. 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
@@ -26,7 +26,7 @@
decode_header/1,
sequence_numbers/1,
hop_by_hop_id/2,
- msg_name/1,
+ msg_name/2,
msg_id/1]).
%% Towards generated encoders (from diameter_gen.hrl).
@@ -99,13 +99,13 @@ e(_, #diameter_packet{msg = [#diameter_header{} = Hdr | As]} = Pkt) ->
Eid:32,
Avps/binary>>};
-e(Mod0, #diameter_packet{header = Hdr, msg = Msg} = Pkt) ->
+e(Mod, #diameter_packet{header = Hdr, msg = Msg} = Pkt) ->
#diameter_header{version = Vsn,
hop_by_hop_id = Hid,
end_to_end_id = Eid}
= Hdr,
- {Mod, MsgName} = rec2msg(Mod0, Msg),
+ MsgName = rec2msg(Mod, Msg),
{Code, Flags0, Aid} = msg_header(Mod, MsgName, Hdr),
Flags = make_flags(Flags0, Hdr),
@@ -192,11 +192,11 @@ encode_avps(Avps) ->
%% msg_header/3
msg_header(Mod, 'answer-message' = MsgName, Header) ->
- ?BASE = Mod,
+ 0 = Mod:id(), %% assert
#diameter_header{application_id = Aid,
cmd_code = Code}
= Header,
- {-1, Flags, ?DIAMETER_APP_ID_COMMON} = ?BASE:msg_header(MsgName),
+ {-1, Flags, ?DIAMETER_APP_ID_COMMON} = Mod:msg_header(MsgName),
{Code, Flags, Aid};
msg_header(Mod, MsgName, _) ->
@@ -204,22 +204,12 @@ msg_header(Mod, MsgName, _) ->
%% rec2msg/2
-rec2msg(_, ['answer-message' = M | _]) ->
- {?BASE, M};
-
-rec2msg(Mod, [MsgName|_])
- when is_atom(MsgName) ->
- {Mod, MsgName};
+rec2msg(_, [Name|_])
+ when is_atom(Name) ->
+ Name;
rec2msg(Mod, Rec) ->
- R = element(1, Rec),
- A = 'answer-message',
- case ?BASE:msg2rec(A) of
- R ->
- {?BASE, A};
- _ ->
- {Mod, Mod:rec2msg(R)}
- end.
+ Mod:rec2msg(element(1, Rec)).
%%% ---------------------------------------------------------------------------
%%% # decode/2
@@ -243,20 +233,19 @@ decode(?APP_ID_RELAY, _, #diameter_packet{} = Pkt) ->
end;
%% Otherwise decode using the dictionary.
-decode(_, Mod, #diameter_packet{header = Hdr} = Pkt)
- when is_atom(Mod) ->
+decode(_, Mod, #diameter_packet{header = Hdr} = Pkt) ->
#diameter_header{cmd_code = CmdCode,
is_request = IsRequest,
is_error = IsError}
= Hdr,
- {M, MsgName} = if IsError andalso not IsRequest ->
- {?BASE, 'answer-message'};
- true ->
- {Mod, Mod:msg_name(CmdCode, IsRequest)}
- end,
+ MsgName = if IsError andalso not IsRequest ->
+ 'answer-message';
+ true ->
+ Mod:msg_name(CmdCode, IsRequest)
+ end,
- decode_avps(MsgName, M, Pkt, collect_avps(Pkt));
+ decode_avps(MsgName, Mod, Pkt, collect_avps(Pkt));
decode(Id, Mod, Bin)
when is_bitstring(Bin) ->
@@ -360,15 +349,15 @@ hop_by_hop_id(Id, <<H:12/binary, _:32, T/binary>>) ->
<<H/binary, Id:32, T/binary>>.
%%% ---------------------------------------------------------------------------
-%%% # msg_name/1
+%%% # msg_name/2
%%% ---------------------------------------------------------------------------
-msg_name(#diameter_header{application_id = ?APP_ID_COMMON,
- cmd_code = C,
- is_request = R}) ->
- ?BASE:msg_name(C,R);
+msg_name(Dict0, #diameter_header{application_id = ?APP_ID_COMMON,
+ cmd_code = C,
+ is_request = R}) ->
+ Dict0:msg_name(C,R);
-msg_name(Hdr) ->
+msg_name(_, Hdr) ->
msg_id(Hdr).
%% Note that messages in different applications could have the same
diff --git a/lib/diameter/src/base/diameter_config.erl b/lib/diameter/src/base/diameter_config.erl
index 63d28f25a2..1486071573 100644
--- a/lib/diameter/src/base/diameter_config.erl
+++ b/lib/diameter/src/base/diameter_config.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 2010-2012. All Rights Reserved.
+%% Copyright Ericsson AB 2010-2013. 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
@@ -113,15 +113,22 @@
-define(VALUES(Rec), tl(tuple_to_list(Rec))).
+%% The RFC 3588 common dictionary is used to validate capabilities
+%% configuration. That a given transport may use the RFC 6733
+%% dictionary is of no consequence.
+-define(BASE, diameter_gen_base_rfc3588).
+
%%% The return values below assume the server diameter_config is started.
%%% The functions will exit if it isn't.
%% --------------------------------------------------------------------------
-%% # start_service(SvcName, Opts)
-%%
-%% Output: ok | {error, Reason}
+%% # start_service/2
%% --------------------------------------------------------------------------
+-spec start_service(diameter:service_name(), [diameter:service_opt()])
+ -> ok
+ | {error, term()}.
+
start_service(SvcName, Opts)
when is_list(Opts) ->
start_rc(sync(SvcName, {start_service, SvcName, Opts})).
@@ -134,22 +141,23 @@ start_rc(timeout) ->
{error, application_not_started}.
%% --------------------------------------------------------------------------
-%% # stop_service(SvcName)
-%%
-%% Output: ok
+%% # stop_service/1
%% --------------------------------------------------------------------------
+-spec stop_service(diameter:service_name())
+ -> ok.
+
stop_service(SvcName) ->
sync(SvcName, {stop_service, SvcName}).
%% --------------------------------------------------------------------------
-%% # add_transport(SvcName, {Type, Opts})
-%%
-%% Input: Type = connect | listen
-%%
-%% Output: {ok, Ref} | {error, Reason}
+%% # add_transport/2
%% --------------------------------------------------------------------------
+-spec add_transport(diameter:service_name(), {connect|listen, [diameter:transport_opt()]})
+ -> {ok, diameter:transport_ref()}
+ | {error, term()}.
+
add_transport(SvcName, {T, Opts})
when is_list(Opts), (T == connect orelse T == listen) ->
sync(SvcName, {add, SvcName, T, Opts}).
@@ -171,6 +179,10 @@ add_transport(SvcName, {T, Opts})
%% Output: ok | {error, Reason}
%% --------------------------------------------------------------------------
+-spec remove_transport(diameter:service_name(), diameter:transport_pred())
+ -> ok
+ | {error, term()}.
+
remove_transport(SvcName, Pred) ->
try
sync(SvcName, {remove, SvcName, pred(Pred)})
@@ -473,6 +485,10 @@ stop(SvcName) ->
%% add/3
+%% Can't check for a single common dictionary since a transport may
+%% restrict applications so that that there's one while the service
+%% has many.
+
add(SvcName, Type, Opts) ->
%% Ensure usable capabilities. diameter_service:merge_service/2
%% depends on this.
@@ -545,7 +561,7 @@ make_config(SvcName, Opts) ->
[] == Apps andalso ?THROW(no_apps),
%% Use the fact that diameter_caps has the same field names as CER.
- Fields = diameter_gen_base_rfc3588:'#info-'(diameter_base_CER) -- ['AVP'],
+ Fields = ?BASE:'#info-'(diameter_base_CER) -- ['AVP'],
COpts = [T || {K,_} = T <- Opts, lists:member(K, Fields)],
Caps = make_caps(#diameter_caps{}, COpts),
@@ -608,14 +624,14 @@ opt(sequence = K, F) ->
E:R ->
?THROW({value, {K, E, R, ?STACK}})
end;
-
+
opt(K, _) ->
?THROW({value, K}).
sequence({H,N} = T)
when 0 =< N, N =< 32, 0 =< H, 0 == H bsr N ->
T;
-
+
sequence(_) ->
?THROW({value, sequence}).
@@ -629,7 +645,8 @@ make_caps(Caps, Opts) ->
%% Validate types by encoding a CER.
encode_CER(Opts) ->
- {ok, CER} = diameter_capx:build_CER(make_caps(?EXAMPLE_CAPS, Opts)),
+ {ok, CER} = diameter_capx:build_CER(make_caps(?EXAMPLE_CAPS, Opts),
+ ?BASE),
Hdr = #diameter_header{version = ?DIAMETER_VERSION,
end_to_end_id = 0,
diff --git a/lib/diameter/src/base/diameter_internal.hrl b/lib/diameter/src/base/diameter_internal.hrl
index 63b35550a8..4b672aa071 100644
--- a/lib/diameter/src/base/diameter_internal.hrl
+++ b/lib/diameter/src/base/diameter_internal.hrl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 2010-2011. All Rights Reserved.
+%% Copyright Ericsson AB 2010-2013. 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
@@ -58,8 +58,6 @@
-define(APP_ID_COMMON, 0).
-define(APP_ID_RELAY, 16#FFFFFFFF).
--define(BASE, diameter_gen_base_rfc3588).
-
%%% ---------------------------------------------------------
%%% RFC 3588, ch 2.6 Peer table
diff --git a/lib/diameter/src/base/diameter_peer.erl b/lib/diameter/src/base/diameter_peer.erl
index 25c9eab4cb..130bedda84 100644
--- a/lib/diameter/src/base/diameter_peer.erl
+++ b/lib/diameter/src/base/diameter_peer.erl
@@ -123,7 +123,7 @@ pair([_ | Rest], Mods, Acc) ->
pair(Rest, Mods, Acc);
%% No transport_module or transport_config: defaults.
-pair([], [], []) ->
+pair([], [], []) ->
[{[?DEFAULT_TMOD], ?DEFAULT_TCFG, ?DEFAULT_TTMO}];
%% One transport_module, one transport_config.
@@ -272,7 +272,7 @@ handle_cast(Msg, State) ->
%% Remote service is distributing a message.
handle_info({notify, SvcName, T}, S) ->
- bang(diameter_service:whois(SvcName), T),
+ diameter_service:notify(SvcName, T),
{noreply, S};
handle_info(Info, State) ->
@@ -304,13 +304,6 @@ code_change(_OldVsn, State, _Extra) ->
ifc_send(Pid, T) ->
Pid ! {diameter, T}.
-%% bang/2
-
-bang(undefined = No, _) ->
- No;
-bang(Pid, T) ->
- Pid ! T.
-
%% call/1
call(Request) ->
diff --git a/lib/diameter/src/base/diameter_peer_fsm.erl b/lib/diameter/src/base/diameter_peer_fsm.erl
index de341741db..ad26f230ef 100644
--- a/lib/diameter/src/base/diameter_peer_fsm.erl
+++ b/lib/diameter/src/base/diameter_peer_fsm.erl
@@ -46,16 +46,19 @@
-include_lib("diameter/include/diameter.hrl").
-include("diameter_internal.hrl").
--include("diameter_gen_base_rfc3588.hrl").
%% Values of Disconnect-Cause in DPR.
--define(GOAWAY, ?'DIAMETER_BASE_DISCONNECT-CAUSE_DO_NOT_WANT_TO_TALK_TO_YOU').
--define(REBOOT, ?'DIAMETER_BASE_DISCONNECT-CAUSE_REBOOTING').
--define(BUSY, ?'DIAMETER_BASE_DISCONNECT-CAUSE_BUSY').
+-define(GOAWAY, 2). %% DO_NOT_WANT_TO_TALK_TO_YOU
+-define(BUSY, 1). %% BUSY
+-define(REBOOT, 0). %% REBOOTING
+%% Values of Inband-Security-Id.
-define(NO_INBAND_SECURITY, 0).
-define(TLS, 1).
+%% Note that the a common dictionary hrl is purposely not included
+%% since the common dictionary is an argument to start/3.
+
%% Keys in process dictionary.
-define(CB_KEY, cb). %% capabilities callback
-define(DPR_KEY, dpr). %% disconnect callback
@@ -100,8 +103,9 @@
| {'Wait-CEA', uint32(), uint32()}
| 'Open',
mode :: accept | connect | {connect, reference()},
- parent :: pid(), %% watchdog process
- transport :: pid(), %% transport process
+ parent :: pid(), %% watchdog process
+ transport :: pid(), %% transport process
+ dictionary :: module(), %% common dictionary
service :: #diameter_service{},
dpr = false :: false | {uint32(), uint32()}}).
%% | hop by hop and end to end identifiers
@@ -134,7 +138,8 @@
%% ---------------------------------------------------------------------------
-spec start(T, [Opt], {diameter:sequence(),
- diameter:restriction(),
+ [node()],
+ module(),
#diameter_service{}})
-> {reference(), pid()}
when T :: {connect|accept, diameter:transport_ref()},
@@ -173,6 +178,7 @@ init(T) ->
i({Ack, WPid, {M, Ref} = T, Opts, {Mask,
Nodes,
+ Dict0,
#diameter_service{capabilities = LCaps}
= Svc}}) ->
erlang:monitor(process, WPid),
@@ -191,6 +197,7 @@ i({Ack, WPid, {M, Ref} = T, Opts, {Mask,
#state{state = {'Wait-Conn-Ack', Tmo},
parent = WPid,
transport = TPid,
+ dictionary = Dict0,
mode = M,
service = svc(Svc, Addrs)}.
%% The transport returns its local ip addresses so that different
@@ -199,8 +206,7 @@ i({Ack, WPid, {M, Ref} = T, Opts, {Mask,
%% sending capabilities exchange messages.
%%
%% Invalid transport config may cause us to crash but note that the
-%% watchdog start (start/2) succeeds regardless so as not to crash the
-%% service.
+%% watchdog start (start/2) succeeds regardless.
%% Wait for the caller to have a monitor to avoid a race with our
%% death. (Since the exit reason is used in diameter_service.)
@@ -455,7 +461,8 @@ start_next(#state{service = Svc0} = S) ->
send_CER(#state{state = {'Wait-Conn-Ack', Tmo},
mode = {connect, Remote},
service = #diameter_service{capabilities = LCaps},
- transport = TPid}
+ transport = TPid,
+ dictionary = Dict}
= S) ->
OH = LCaps#diameter_caps.origin_host,
req_send_CER(OH, Remote)
@@ -466,7 +473,7 @@ send_CER(#state{state = {'Wait-Conn-Ack', Tmo},
#diameter_packet{header = #diameter_header{end_to_end_id = Eid,
hop_by_hop_id = Hid}}
= Pkt
- = encode(CER),
+ = encode(CER, Dict),
send(TPid, Pkt),
start_timer(Tmo, S#state{state = {'Wait-CEA', Hid, Eid}}).
@@ -488,19 +495,20 @@ start_timer(Tmo, #state{state = PS} = S) ->
%% build_CER/1
-build_CER(#state{service = #diameter_service{capabilities = LCaps}}) ->
- {ok, CER} = diameter_capx:build_CER(LCaps),
+build_CER(#state{service = #diameter_service{capabilities = LCaps},
+ dictionary = Dict}) ->
+ {ok, CER} = diameter_capx:build_CER(LCaps, Dict),
CER.
-%% encode/1
+%% encode/2
-encode(Rec) ->
+encode(Rec, Dict) ->
Seq = diameter_session:sequence({_,_} = getr(?SEQUENCE_KEY)),
Hdr = #diameter_header{version = ?DIAMETER_VERSION,
end_to_end_id = Seq,
hop_by_hop_id = Seq},
- diameter_codec:encode(?BASE, #diameter_packet{header = Hdr,
- msg = Rec}).
+ diameter_codec:encode(Dict, #diameter_packet{header = Hdr,
+ msg = Rec}).
%% recv/2
@@ -521,9 +529,10 @@ recv(#diameter_packet{header = #diameter_header{length = Len}
recv(#diameter_packet{header = #diameter_header{} = Hdr}
= Pkt,
- #state{parent = Pid}
+ #state{parent = Pid,
+ dictionary = Dict0}
= S) ->
- Name = diameter_codec:msg_name(Hdr),
+ Name = diameter_codec:msg_name(Dict0, Hdr),
Pid ! {recv, self(), Name, Pkt},
diameter_stats:incr({msg_id(Name, Hdr), recv}), %% count received
rcv(Name, Pkt, S);
@@ -608,13 +617,13 @@ send(Pid, Msg) ->
%% handle_request/3
-handle_request(Type, #diameter_packet{} = Pkt, S) ->
+handle_request(Type, #diameter_packet{} = Pkt, #state{dictionary = D} = S) ->
?LOG(recv, Type),
- send_answer(Type, diameter_codec:decode(?BASE, Pkt), S).
+ send_answer(Type, diameter_codec:decode(D, Pkt), S).
%% send_answer/3
-send_answer(Type, ReqPkt, #state{transport = TPid} = S) ->
+send_answer(Type, ReqPkt, #state{transport = TPid, dictionary = Dict} = S) ->
#diameter_packet{header = H,
transport_data = TD}
= ReqPkt,
@@ -631,13 +640,15 @@ send_answer(Type, ReqPkt, #state{transport = TPid} = S) ->
msg = Msg,
transport_data = TD},
- send(TPid, diameter_codec:encode(?BASE, Pkt)),
+ send(TPid, diameter_codec:encode(Dict, Pkt)),
eval(PostF, S).
eval([F|A], S) ->
apply(F, A ++ [S]);
eval(ok, S) ->
- S.
+ S;
+eval(T, _) ->
+ close(T).
%% build_answer/3
@@ -648,11 +659,11 @@ build_answer('CER',
is_error = false},
errors = []}
= Pkt,
- S) ->
- {SupportedApps, RCaps, #diameter_base_CEA{'Result-Code' = RC,
- 'Inband-Security-Id' = IS}
- = CEA}
- = recv_CER(CER, S),
+ #state{dictionary = Dict0}
+ = S) ->
+ {SupportedApps, RCaps, CEA} = recv_CER(CER, S),
+
+ [RC, IS] = Dict0:'#get-'(['Result-Code', 'Inband-Security-Id'], CEA),
#diameter_caps{origin_host = {OH, DH}}
= Caps
@@ -665,10 +676,10 @@ build_answer('CER',
orelse ?THROW(4003), %% DIAMETER_ELECTION_LOST
caps_cb(Caps)
of
- N -> {cea(CEA, N), [fun open/5, Pkt,
- SupportedApps,
- Caps,
- {accept, hd([_] = IS)}]}
+ N -> {cea(CEA, N, Dict0), [fun open/5, Pkt,
+ SupportedApps,
+ Caps,
+ {accept, hd([_] = IS)}]}
catch
?FAILURE(Reason) ->
rejected(Reason, {'CER', Reason, Caps, Pkt}, S)
@@ -685,15 +696,15 @@ build_answer(Type,
RC = rc(H, Es),
{answer(Type, RC, Es, S), post(Type, RC, Pkt, S)}.
-cea(CEA, ok) ->
+cea(CEA, ok, _) ->
CEA;
-cea(CEA, 2001) ->
+cea(CEA, 2001, _) ->
CEA;
-cea(CEA, RC) ->
- CEA#diameter_base_CEA{'Result-Code' = RC}.
+cea(CEA, RC, Dict0) ->
+ Dict0:'#set-'({'Result-Code', RC}, CEA).
post('CER' = T, RC, Pkt, S) ->
- [fun(_) -> close({T, caps(S), {RC, Pkt}}) end];
+ {T, caps(S), {RC, Pkt}};
post(_, _, _, _) ->
ok.
@@ -703,7 +714,7 @@ rejected({capabilities_cb, _F, Reason}, T, S) ->
rejected(discard, T, _) ->
close(T);
rejected({N, Es}, T, S) ->
- {answer('CER', N, Es, S), [fun(_) -> close(T) end]};
+ {answer('CER', N, Es, S), T};
rejected(N, T, S) ->
rejected({N, []}, T, S).
@@ -729,7 +740,7 @@ is_origin({N, _}) ->
orelse N == 'Origin-State-Id'.
%% failed_avp/1
-
+
failed_avp([] = No) ->
No;
failed_avp(Avps) ->
@@ -818,22 +829,23 @@ a('DPR', #diameter_caps{origin_host = {Host, _},
%% recv_CER/2
-recv_CER(CER, #state{service = Svc}) ->
- {ok, T} = diameter_capx:recv_CER(CER, Svc),
+recv_CER(CER, #state{service = Svc, dictionary = Dict}) ->
+ {ok, T} = diameter_capx:recv_CER(CER, Svc, Dict),
T.
%% handle_CEA/1
handle_CEA(#diameter_packet{bin = Bin}
= Pkt,
- #state{service = #diameter_service{capabilities = LCaps}}
+ #state{dictionary = Dict0,
+ service = #diameter_service{capabilities = LCaps}}
= S)
when is_binary(Bin) ->
?LOG(recv, 'CEA'),
#diameter_packet{msg = CEA}
= DPkt
- = diameter_codec:decode(?BASE, Pkt),
+ = diameter_codec:decode(Dict0, Pkt),
{SApps, IS, RCaps} = recv_CEA(DPkt, S),
@@ -841,8 +853,7 @@ handle_CEA(#diameter_packet{bin = Bin}
= Caps
= capz(LCaps, RCaps),
- #diameter_base_CEA{'Result-Code' = RC}
- = CEA,
+ RC = Dict0:'#get-'('Result-Code', CEA),
%% Ensure that we don't already have a connection to the peer in
%% question. This isn't the peer election of 3588 except in the
@@ -878,8 +889,9 @@ recv_CEA(#diameter_packet{header = #diameter_header{version
is_error = false},
msg = CEA,
errors = []},
- #state{service = Svc}) ->
- {ok, T} = diameter_capx:recv_CEA(CEA, Svc),
+ #state{service = Svc,
+ dictionary = Dict}) ->
+ {ok, T} = diameter_capx:recv_CEA(CEA, Svc, Dict),
T;
recv_CEA(Pkt, S) ->
@@ -1022,13 +1034,14 @@ dpr([CB|Rest], [Reason | _] = Args, S) ->
diameter_lib:error_report(failure, No),
{stop, No}
end;
-
+
dpr([], [Reason | _], S) ->
send_dpr(Reason, [], S).
-record(opts, {cause, timeout = ?DPA_TIMEOUT}).
send_dpr(Reason, Opts, #state{transport = TPid,
+ dictionary = Dict,
service = #diameter_service{capabilities = Caps}}
= S) ->
#opts{cause = Cause, timeout = Tmo}
@@ -1048,7 +1061,8 @@ send_dpr(Reason, Opts, #state{transport = TPid,
= Pkt
= encode(['DPR', {'Origin-Host', OH},
{'Origin-Realm', OR},
- {'Disconnect-Cause', Cause}]),
+ {'Disconnect-Cause', Cause}],
+ Dict),
send(TPid, Pkt),
dpa_timer(Tmo),
?LOG(send, 'DPR'),
diff --git a/lib/diameter/src/base/diameter_service.erl b/lib/diameter/src/base/diameter_service.erl
index 3cab914fdb..f1342df16c 100644
--- a/lib/diameter/src/base/diameter_service.erl
+++ b/lib/diameter/src/base/diameter_service.erl
@@ -24,33 +24,38 @@
-module(diameter_service).
-behaviour(gen_server).
+%% towards diameter_service_sup
+-export([start_link/1]).
+
+%% towards diameter
+-export([subscribe/1,
+ unsubscribe/1,
+ services/0,
+ info/2]).
+
+%% towards diameter_config
-export([start/1,
stop/1,
start_transport/2,
- stop_transport/2,
- info/2,
- call/4]).
+ stop_transport/2]).
-%% towards diameter_watchdog
--export([receive_message/3]).
+%% towards diameter_peer
+-export([notify/2]).
-%% service supervisor
--export([start_link/1]).
+%% towards diameter_traffic
+-export([find_incoming_app/4,
+ pick_peer/3]).
--export([subscribe/1,
- unsubscribe/1,
+%% test/debug
+-export([services/1,
subscriptions/1,
subscriptions/0,
- services/0,
- services/1,
- whois/1]).
-
-%% test/debug
--export([call_module/3,
+ call_module/3,
+ whois/1,
state/1,
uptime/1]).
-%%% gen_server callbacks
+%% gen_server callbacks
-export([init/1,
handle_call/3,
handle_cast/2,
@@ -58,9 +63,6 @@
terminate/2,
code_change/3]).
-%% Other callbacks.
--export([send/1]).
-
-include_lib("diameter/include/diameter.hrl").
-include("diameter_internal.hrl").
@@ -78,11 +80,8 @@
| ?WD_REOPEN.
-define(DEFAULT_TC, 30000). %% RFC 3588 ch 2.1
--define(DEFAULT_TIMEOUT, 5000). %% for outgoing requests
-define(RESTART_TC, 1000). %% if restart was this recent
--define(RELAY, ?DIAMETER_DICT_RELAY).
-
%% Used to be able to swap this with anything else dict-like but now
%% rely on the fact that a service's #state{} record does not change
%% in storing in it ?STATE table and not always going through the
@@ -90,10 +89,6 @@
%% a ?Dict don't change the handle to it.
-define(Dict, diameter_dict).
-%% Table containing outgoing requests for which a reply has yet to be
-%% received.
--define(REQUEST_TABLE, diameter_request).
-
%% Maintains state in a table. In contrast to previously, a service's
%% stat is not constant and is accessed outside of the service
%% process.
@@ -107,31 +102,33 @@
%% Workaround for dialyzer's lack of understanding of match specs.
-type match(T)
- :: T | '_' | '$1' | '$2' | '$3' | '$4'.
-
-%% State of service gen_server.
+ :: T | '_' | '$1' | '$2'.
+
+%% State of service gen_server. Note that the state term itself
+%% doesn't change, which is relevant for the stateless application
+%% callbacks since the state is retrieved from ?STATE_TABLE from
+%% outside the service process. The pid in the service record is used
+%% to determine whether or not we need to call the process for a
+%% pick_peer callback in the statefull case.
-record(state,
{id = now(),
- service_name, %% as passed to start_service/2, key in ?STATE_TABLE
+ service_name :: diameter:service_name(), %% key in ?STATE_TABLE
service :: #diameter_service{},
watchdogT = ets_new(watchdogs) %% #watchdog{} at start
:: ets:tid(),
peerT = ets_new(peers) %% #peer{pid = TPid} at okay/reopen
:: ets:tid(),
- shared_peers = ?Dict:new(), %% Alias -> [{TPid, Caps}, ...]
- local_peers = ?Dict:new(), %% Alias -> [{TPid, Caps}, ...]
+ shared_peers = ?Dict:new() %% Alias -> [{TPid, Caps}, ...]
+ :: ets:tid(),
+ local_peers = ?Dict:new() %% Alias -> [{TPid, Caps}, ...]
+ :: ets:tid(),
monitor = false :: false | pid(), %% process to die with
options
:: [{sequence, diameter:sequence()} %% sequence mask
| {restrict_connections, diameter:restriction()}
| {share_peers, boolean()} %% broadcast peers to remote nodes?
| {use_shared_peers, boolean()}]}).%% use broadcasted peers?
-%% shared_peers reflects the peers broadcast from remote nodes. Note
-%% that the state term itself doesn't change, which is relevant for
-%% the stateless application callbacks since the state is retrieved
-%% from ?STATE_TABLE from outside the service process. The pid in the
-%% service record is used to determine whether or not we need to call
-%% the process for a pick_peer callback.
+%% shared_peers reflects the peers broadcast from remote nodes.
%% Record representing an RFC 3539 watchdog process implemented by
%% diameter_watchdog.
@@ -154,28 +151,9 @@
started = now(), %% at process start
watchdog :: pid()}). %% key into watchdogT
-%% Record stored in diameter_request for each outgoing request.
--record(request,
- {from, %% arg 2 of handle_call/3
- handler :: match(pid()), %% request process
- transport :: match(pid()), %% peer process
- caps :: match(#diameter_caps{}),
- app :: match(diameter:app_alias()),%% #diameter_app.alias
- dictionary :: match(module()), %% #diameter_app.dictionary
- module :: match([module() | list()]), %% #diameter_app.module
- filter :: match(diameter:peer_filter()),
- packet :: match(#diameter_packet{})}).
-
-%% Record call/4 options are parsed into.
--record(options,
- {filter = none :: diameter:peer_filter(),
- extra = [] :: list(),
- timeout = ?DEFAULT_TIMEOUT :: 0..16#FFFFFFFF,
- detach = false :: boolean()}).
-
-%%% ---------------------------------------------------------------------------
-%%% # start(SvcName)
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # start/1
+%% ---------------------------------------------------------------------------
start(SvcName) ->
diameter_service_sup:start_child(SvcName).
@@ -186,9 +164,9 @@ start_link(SvcName) ->
%% Put the arbitrary term SvcName in a list in case we ever want to
%% send more than this and need to distinguish old from new.
-%%% ---------------------------------------------------------------------------
-%%% # stop(SvcName)
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # stop/1
+%% ---------------------------------------------------------------------------
stop(SvcName) ->
case whois(SvcName) of
@@ -204,180 +182,43 @@ stop(ok, Pid) ->
stop(No, _) ->
No.
-%%% ---------------------------------------------------------------------------
-%%% # start_transport(SvcName, {Ref, Type, Opts})
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # start_transport/3
+%% ---------------------------------------------------------------------------
-start_transport(SvcName, {_,_,_} = T) ->
+start_transport(SvcName, {_Ref, _Type, _Opts} = T) ->
call_service_by_name(SvcName, {start, T}).
-%%% ---------------------------------------------------------------------------
-%%% # stop_transport(SvcName, Refs)
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # stop_transport/2
+%% ---------------------------------------------------------------------------
stop_transport(_, []) ->
ok;
stop_transport(SvcName, [_|_] = Refs) ->
call_service_by_name(SvcName, {stop, Refs}).
-%%% ---------------------------------------------------------------------------
-%%% # info(SvcName, Item)
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # info/2
+%% ---------------------------------------------------------------------------
info(SvcName, Item) ->
- case find_state(SvcName) of
- #state{} = S ->
+ case lookup_state(SvcName) of
+ [#state{} = S] ->
service_info(Item, S);
- false ->
+ [] ->
undefined
end.
-%%% ---------------------------------------------------------------------------
-%%% # receive_message(TPid, Pkt, MessageData)
-%%% ---------------------------------------------------------------------------
-
-%% Handle an incoming Diameter message in the watchdog process. This
-%% used to come through the service process but this avoids that
-%% becoming a bottleneck.
-
-receive_message(TPid, Pkt, T)
- when is_pid(TPid) ->
- #diameter_packet{header = #diameter_header{is_request = R}} = Pkt,
- recv(R, (not R) andalso lookup_request(Pkt, TPid), TPid, Pkt, T).
-
-%% Incoming request ...
-recv(true, false, TPid, Pkt, T) ->
- try
- spawn(fun() -> recv_request(TPid, Pkt, T) end)
- catch
- error: system_limit = E -> %% discard
- ?LOG({error, E}, now())
- end;
-
-%% ... answer to known request ...
-recv(false, #request{from = {_, Ref}, handler = Pid} = Req, _, Pkt, _) ->
- Pid ! {answer, Ref, Req, Pkt};
-%% Note that failover could have happened prior to this message being
-%% received and triggering failback. That is, both a failover message
-%% and answer may be on their way to the handler process. In the worst
-%% case the request process gets notification of the failover and
-%% sends to the alternate peer before an answer arrives, so it's
-%% always the case that we can receive more than one answer after
-%% failover. The first answer received by the request process wins,
-%% any others are discarded.
-
-%% ... or not.
-recv(false, false, _, _, _) ->
- ok.
-
-%%% ---------------------------------------------------------------------------
-%%% # call(SvcName, App, Msg, Options)
-%%% ---------------------------------------------------------------------------
-
-call(SvcName, App, Msg, Options)
- when is_list(Options) ->
- Rec = make_options(Options),
- Ref = make_ref(),
- Caller = {self(), Ref},
- Fun = fun() -> exit({Ref, call(SvcName, App, Msg, Rec, Caller)}) end,
- try spawn_monitor(Fun) of
- {_, MRef} ->
- recv(MRef, Ref, Rec#options.detach, false)
- catch
- error: system_limit = E ->
- {error, E}
- end.
-
-%% Don't rely on gen_server:call/3 for the timeout handling since it
-%% makes no guarantees about not leaving a reply message in the
-%% mailbox if we catch its exit at timeout. It currently *can* do so,
-%% which is also undocumented.
-
-recv(MRef, _, true, true) ->
- erlang:demonitor(MRef, [flush]),
- ok;
-
-recv(MRef, Ref, Detach, Sent) ->
- receive
- Ref -> %% send has been attempted
- recv(MRef, Ref, Detach, true);
- {'DOWN', MRef, process, _, Reason} ->
- call_rc(Reason, Ref, Sent)
- end.
-
-%% call/5 has returned ...
-call_rc({Ref, Ans}, Ref, _) ->
- Ans;
-
-%% ... or not. In this case failure/encode are documented.
-call_rc(_, _, Sent) ->
- {error, choose(Sent, failure, encode)}.
-
-%% call/5
-%%
-%% In the process spawned for the outgoing request.
-
-call(SvcName, App, Msg, Opts, Caller) ->
- c(find_state(SvcName), App, Msg, Opts, Caller).
-
-c(#state{service_name = Svc, options = [{_, Mask} | _]} = S,
- App,
- Msg,
- Opts,
- Caller) ->
- case find_transport(App, Msg, Opts, S) of
- {_,_,_} = T ->
- send_request(T, Mask, Msg, Opts, Caller, Svc);
- false ->
- {error, no_connection};
- {error, _} = No ->
- No
- end;
-
-c(false, _, _, _, _) ->
- {error, no_service}.
-
-%% find_state/1
-
-find_state(SvcName) ->
- fs(ets:lookup(?STATE_TABLE, SvcName)).
-
-fs([#state{} = S]) ->
- S;
-
-fs([]) ->
- false.
-
-%% make_options/1
+%% lookup_state/1
-make_options(Options) ->
- lists:foldl(fun mo/2, #options{}, Options).
+lookup_state(SvcName) ->
+ ets:lookup(?STATE_TABLE, SvcName).
-mo({timeout, T}, Rec)
- when is_integer(T), 0 =< T ->
- Rec#options{timeout = T};
-
-mo({filter, F}, #options{filter = none} = Rec) ->
- Rec#options{filter = F};
-mo({filter, F}, #options{filter = {all, Fs}} = Rec) ->
- Rec#options{filter = {all, [F | Fs]}};
-mo({filter, F}, #options{filter = F0} = Rec) ->
- Rec#options{filter = {all, [F0, F]}};
-
-mo({extra, L}, #options{extra = X} = Rec)
- when is_list(L) ->
- Rec#options{extra = X ++ L};
-
-mo(detach, Rec) ->
- Rec#options{detach = true};
-
-mo(T, _) ->
- ?ERROR({invalid_option, T}).
-
-%%% ---------------------------------------------------------------------------
-%%% # subscribe(SvcName)
-%%% # unsubscribe(SvcName)
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # subscribe/1
+%% # unsubscribe/1
+%% ---------------------------------------------------------------------------
subscribe(SvcName) ->
diameter_reg:add({?MODULE, subscriber, SvcName}).
@@ -394,9 +235,9 @@ subscriptions() ->
pmap(Props) ->
lists:map(fun({{?MODULE, _, Name}, Pid}) -> {Name, Pid} end, Props).
-%%% ---------------------------------------------------------------------------
-%%% # services(Pattern)
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # services/1
+%% ---------------------------------------------------------------------------
services(Pat) ->
pmap(diameter_reg:match({?MODULE, service, Pat})).
@@ -412,6 +253,86 @@ whois(SvcName) ->
undefined
end.
+%% ---------------------------------------------------------------------------
+%% # pick_peer/3
+%% ---------------------------------------------------------------------------
+
+-spec pick_peer(SvcName, AppOrAlias, Opts)
+ -> {{TPid, Caps, App}, Mask}
+ | false
+ | {error, term()}
+ when SvcName :: diameter:service_name(),
+ AppOrAlias :: {alias, diameter:app_alias()} | #diameter_app{},
+ Opts :: tuple(),
+ TPid :: pid(),
+ Caps :: #diameter_caps{},
+ App :: #diameter_app{},
+ Mask :: diameter:sequence().
+
+pick_peer(SvcName, App, Opts) ->
+ pick(lookup_state(SvcName), App, Opts).
+
+pick([], _, _) ->
+ {error, no_service};
+
+pick([S], App, Opts) ->
+ pick(S, App, Opts);
+
+pick(#state{service = #diameter_service{applications = Apps}}
+ = S,
+ {alias, Alias},
+ Opts) -> %% initial call from diameter:call/4
+ pick(S, find_outgoing_app(Alias, Apps), Opts);
+
+pick(_, false, _) ->
+ false;
+
+pick(#state{options = [{_, Mask} | _]}
+ = S,
+ #diameter_app{module = ModX, dictionary = Dict}
+ = App0,
+ {DestF, Filter, Xtra}) ->
+ App = App0#diameter_app{module = ModX ++ Xtra},
+ [_,_] = RealmAndHost = diameter_lib:eval([DestF, Dict]),
+ case pick_peer(App, RealmAndHost, Filter, S) of
+ {TPid, Caps} ->
+ {{TPid, Caps, App}, Mask};
+ false = No ->
+ No
+ end.
+
+%% ---------------------------------------------------------------------------
+%% # find_incoming_app/4
+%% ---------------------------------------------------------------------------
+
+-spec find_incoming_app(PeerT, TPid, Id, Apps)
+ -> {#diameter_app{}, #diameter_caps{}} %% connection and suitable app
+ | #diameter_caps{} %% connection but no suitable app
+ | false %% no connection
+ when PeerT :: ets:tid(),
+ TPid :: pid(),
+ Id :: non_neg_integer(),
+ Apps :: [#diameter_app{}].
+
+find_incoming_app(PeerT, TPid, Id, Apps) ->
+ try ets:lookup(PeerT, TPid) of
+ [#peer{} = P] ->
+ find_incoming_app(P, Id, Apps);
+ [] -> %% transport has gone down
+ false
+ catch
+ error: badarg -> %% service has gone down (and taken table with it)
+ false
+ end.
+
+%% ---------------------------------------------------------------------------
+%% # notify/2
+%% ---------------------------------------------------------------------------
+
+notify(SvcName, Msg) ->
+ Pid = whois(SvcName),
+ is_pid(Pid) andalso (Pid ! Msg).
+
%% ===========================================================================
%% ===========================================================================
@@ -426,9 +347,9 @@ uptime(Svc) ->
call_module(Service, AppMod, Request) ->
call_service(Service, {call_module, AppMod, Request}).
-%%% ---------------------------------------------------------------------------
-%%% # init([SvcName])
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # init/1
+%% ---------------------------------------------------------------------------
init([SvcName]) ->
process_flag(trap_exit, true), %% ensure terminate(shutdown, _)
@@ -439,9 +360,9 @@ i(SvcName, true) ->
i(_, false) ->
{stop, {shutdown, already_started}}.
-%%% ---------------------------------------------------------------------------
-%%% # handle_call(Req, From, State)
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # handle_call/3
+%% ---------------------------------------------------------------------------
handle_call(state, _, S) ->
{reply, S, S};
@@ -477,17 +398,17 @@ handle_call(Req, From, S) ->
unexpected(handle_call, [Req, From], S),
{reply, nok, S}.
-%%% ---------------------------------------------------------------------------
-%%% # handle_cast(Req, State)
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # handle_cast/2
+%% ---------------------------------------------------------------------------
handle_cast(Req, S) ->
unexpected(handle_cast, [Req], S),
{noreply, S}.
-%%% ---------------------------------------------------------------------------
-%%% # handle_info(Req, State)
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # handle_info/2
+%% ---------------------------------------------------------------------------
handle_info(T, #state{} = S) ->
case transition(T,S) of
@@ -570,20 +491,13 @@ transition({tc_timeout, T}, S) ->
tc_timeout(T, S),
ok;
-%% Request process is telling us it may have missed a failover message
-%% after a transport went down and the service process looked up
-%% outstanding requests.
-transition({failover, TRef, Seqs}, S) ->
- failover(TRef, Seqs, S),
- ok;
-
transition(Req, S) ->
unexpected(handle_info, [Req], S),
ok.
-%%% ---------------------------------------------------------------------------
-%%% # terminate(Reason, State)
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # terminate/2
+%% ---------------------------------------------------------------------------
terminate(Reason, #state{service_name = Name} = S) ->
send_event(Name, stop),
@@ -591,9 +505,9 @@ terminate(Reason, #state{service_name = Name} = S) ->
shutdown == Reason %% application shutdown
andalso shutdown(application, S).
-%%% ---------------------------------------------------------------------------
-%%% # code_change(FromVsn, State, Extra)
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # code_change/3
+%% ---------------------------------------------------------------------------
code_change(FromVsn,
#state{service_name = SvcName,
@@ -619,30 +533,20 @@ code_change(FromVsn, SvcName, Extra, #diameter_app{alias = Alias} = A) ->
unexpected(F, A, #state{service_name = Name}) ->
?UNEXPECTED(F, A ++ [Name]).
-cb([_|_] = M, F, A) ->
- eval(M, F, A);
-cb(Rec, F, A) ->
- {_, M} = app(Rec),
+cb(#diameter_app{module = [_|_] = M}, F, A) ->
eval(M, F, A).
-app(#request{app = A, module = M}) ->
- {A,M};
-app(#diameter_app{alias = A, module = M}) ->
- {A,M}.
-
eval([M|X], F, A) ->
apply(M, F, A ++ X).
%% Callback with state.
-state_cb(#diameter_app{mutable = false, init_state = S}, {ModX, F, A}) ->
+state_cb(#diameter_app{module = ModX, mutable = false, init_state = S},
+ pick_peer = F,
+ A) ->
eval(ModX, F, A ++ [S]);
-state_cb(#diameter_app{mutable = true, alias = Alias}, {_,_,_} = MFA) ->
- state_cb(MFA, Alias);
-
-state_cb({ModX,F,A}, Alias)
- when is_list(ModX) ->
+state_cb(#diameter_app{module = ModX, alias = Alias}, F, A) ->
eval(ModX, F, A ++ [mod_state(Alias)]).
choose(true, X, _) -> X;
@@ -668,9 +572,9 @@ mod_state(Alias) ->
mod_state(Alias, ModS) ->
put({?MODULE, mod_state, Alias}, ModS).
-%%% ---------------------------------------------------------------------------
-%%% # shutdown/2
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # shutdown/2
+%% ---------------------------------------------------------------------------
%% remove_transport
shutdown(Refs, #state{watchdogT = WatchdogT})
@@ -697,9 +601,9 @@ st(#watchdog{pid = Pid}, Reason, Acc) ->
Pid ! {shutdown, self(), Reason},
[Pid | Acc].
-%%% ---------------------------------------------------------------------------
-%%% # call_service/2
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # call_service/2
+%% ---------------------------------------------------------------------------
call_service(Pid, Req)
when is_pid(Pid) ->
@@ -722,9 +626,9 @@ cs(Pid, Req)
cs(undefined, _) ->
{error, no_service}.
-%%% ---------------------------------------------------------------------------
-%%% # i/1
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # i/1
+%% ---------------------------------------------------------------------------
%% Intialize the state of a service gen_server.
@@ -794,9 +698,9 @@ get_value(Key, Vs) ->
{_, V} = lists:keyfind(Key, 1, Vs),
V.
-%%% ---------------------------------------------------------------------------
-%%% # start/3
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # start/3
+%% ---------------------------------------------------------------------------
%% If the initial start/3 at service/transport start succeeds then
%% subsequent calls to start/4 on the same service will also succeed
@@ -830,14 +734,20 @@ start(Ref, Type, Opts, #state{watchdogT = WatchdogT,
peerT = PeerT,
options = SvcOpts,
service_name = SvcName,
- service = Svc})
+ service = Svc0})
when Type == connect;
Type == accept ->
- Pid = s(Type, Ref, {PeerT,
+ #diameter_service{applications = Apps}
+ = Svc
+ = merge_service(Opts, Svc0),
+ {_,_} = Mask = proplists:get_value(sequence, SvcOpts),
+ Pid = s(Type, Ref, {diameter_traffic:make_recvdata([SvcName,
+ PeerT,
+ Apps,
+ Mask]),
Opts,
- SvcName,
SvcOpts,
- merge_service(Opts, Svc)}),
+ Svc}),
insert(WatchdogT, #watchdog{pid = Pid,
type = Type,
ref = Ref,
@@ -884,9 +794,9 @@ ms({capabilities, Opts}, #diameter_service{capabilities = Caps0} = Svc)
ms(_, Svc) ->
Svc.
-%%% ---------------------------------------------------------------------------
-%%% # accepted/3
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # accepted/3
+%% ---------------------------------------------------------------------------
accepted(Pid, _TPid, #state{watchdogT = WatchdogT} = S) ->
#watchdog{ref = Ref, type = accept = T, peer = false, options = Opts}
@@ -899,11 +809,11 @@ fetch(Tid, Key) ->
[T] = ets:lookup(Tid, Key),
T.
-%%% ---------------------------------------------------------------------------
-%%% # watchdog/6
-%%%
-%%% React to a watchdog state transition.
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # watchdog/6
+%%
+%% React to a watchdog state transition.
+%% ---------------------------------------------------------------------------
%% Watchdog has a new open connection.
watchdog(TPid, [T], _, ?WD_OKAY, Wd, State) ->
@@ -933,43 +843,43 @@ watchdog(TPid, [], _, ?WD_DOWN = To, Wd, #state{peerT = PeerT} = S) ->
watchdog(_, [], _, _, _, _) ->
ok.
-%%% ---------------------------------------------------------------------------
-%%% # connection_up/3
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # connection_up/3
+%% ---------------------------------------------------------------------------
%% Watchdog process has reached state OKAY.
-connection_up({TPid, {Caps, SApps, Pkt}},
+connection_up({TPid, {Caps, SupportedApps, Pkt}},
#watchdog{pid = Pid}
= Wd,
#state{peerT = PeerT}
= S) ->
Pr = #peer{pid = TPid,
- apps = SApps,
+ apps = SupportedApps,
caps = Caps,
watchdog = Pid},
insert(PeerT, Pr),
connection_up([Pkt], Wd#watchdog{peer = TPid}, Pr, S).
-%%% ---------------------------------------------------------------------------
-%%% # reopen/3
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # reopen/3
+%% ---------------------------------------------------------------------------
-reopen({TPid, {Caps, SApps, _Pkt}},
+reopen({TPid, {Caps, SupportedApps, _Pkt}},
#watchdog{pid = Pid}
= Wd,
#state{watchdogT = WatchdogT,
peerT = PeerT}) ->
insert(PeerT, #peer{pid = TPid,
- apps = SApps,
+ apps = SupportedApps,
caps = Caps,
watchdog = Pid}),
insert(WatchdogT, Wd#watchdog{state = ?WD_REOPEN,
peer = TPid}).
-%%% ---------------------------------------------------------------------------
-%%% # connection_up/2
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # connection_up/2
+%% ---------------------------------------------------------------------------
%% Watchdog has recovered as suspect connection. Note that there has
%% been no new capabilties exchange in this case.
@@ -987,11 +897,10 @@ connection_up(Extra,
#state{watchdogT = WatchdogT,
local_peers = LDict,
service_name = SvcName,
- service
- = #diameter_service{applications = Apps}}
+ service = #diameter_service{applications = Apps}}
= S) ->
insert(WatchdogT, Wd#watchdog{state = ?WD_OKAY}),
- request_peer_up(TPid),
+ diameter_traffic:peer_up(TPid),
insert_local_peer(SApps, {{TPid, Caps}, {SvcName, Apps}}, LDict),
report_status(up, Wd, Pr, S, Extra).
@@ -1003,13 +912,57 @@ ilp({Id, Alias}, {TC, SA}, LDict) ->
?Dict:append(Alias, TC, LDict).
init_conn(Id, Alias, {TPid, _} = TC, {SvcName, Apps}) ->
- #diameter_app{module = ModX,
- id = Id} %% assert
+ #diameter_app{id = Id} %% assert
+ = App
= find_app(Alias, Apps),
- peer_cb({ModX, peer_up, [SvcName, TC]}, Alias)
+ peer_cb(App, peer_up, [SvcName, TC])
orelse exit(TPid, kill). %% fake transport failure
+%% ---------------------------------------------------------------------------
+%% # find_incoming_app/3
+%% ---------------------------------------------------------------------------
+
+%% No one should be sending the relay identifier.
+find_incoming_app(#peer{caps = Caps}, ?APP_ID_RELAY, _) ->
+ Caps;
+
+find_incoming_app(Peer, Id, Apps)
+ when is_integer(Id) ->
+ find_incoming_app(Peer, [Id, ?APP_ID_RELAY], Apps);
+
+%% Note that the apps represented in SApps may be a strict subset of
+%% those in Apps.
+find_incoming_app(#peer{apps = SApps, caps = Caps}, Ids, Apps) ->
+ case keyfind(Ids, 1, SApps) of
+ {_Id, Alias} ->
+ {#diameter_app{} = find_app(Alias, Apps), Caps};
+ false ->
+ Caps
+ end.
+
+%% keyfind/3
+
+keyfind([], _, _) ->
+ false;
+keyfind([Key | Rest], Pos, L) ->
+ case lists:keyfind(Key, Pos, L) of
+ false ->
+ keyfind(Rest, Pos, L);
+ T ->
+ T
+ end.
+
+%% find_outgoing_app/2
+
+find_outgoing_app(Alias, Apps) ->
+ case find_app(Alias, Apps) of
+ #diameter_app{id = ?APP_ID_RELAY} ->
+ false;
+ A ->
+ A
+ end.
+
%% find_app/2
find_app(Alias, Apps) ->
@@ -1017,20 +970,21 @@ find_app(Alias, Apps) ->
%% Don't bring down the service (and all associated connections)
%% regardless of what happens.
-peer_cb(MFA, Alias) ->
- try state_cb(MFA, Alias) of
+peer_cb(App, F, A) ->
+ try state_cb(App, F, A) of
ModS ->
- mod_state(Alias, ModS),
+ mod_state(App#diameter_app.alias, ModS),
true
catch
E:R ->
- diameter_lib:error_report({failure, {E, R, Alias, ?STACK}}, MFA),
+ diameter_lib:error_report({failure, {E, R, ?STACK}},
+ {App, F, A}),
false
end.
-%%% ---------------------------------------------------------------------------
-%%% # connection_down/3
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # connection_down/3
+%% ---------------------------------------------------------------------------
connection_down(#watchdog{state = ?WD_OKAY,
peer = TPid}
@@ -1044,7 +998,7 @@ connection_down(#watchdog{state = ?WD_OKAY,
= S) ->
report_status(down, Wd, Pr, S, []),
remove_local_peer(SApps, {{TPid, Caps}, {SvcName, Apps}}, LDict),
- request_peer_down(TPid, S);
+ diameter_traffic:peer_down(TPid);
connection_down(#watchdog{}, #peer{}, _) ->
ok;
@@ -1071,15 +1025,15 @@ rlp({Id, Alias}, {TC, SA}, LDict) ->
?Dict:store(Alias, lists:delete(TC, L), LDict).
down_conn(Id, Alias, TC, {SvcName, Apps}) ->
- #diameter_app{module = ModX,
- id = Id} %% assert
+ #diameter_app{id = Id} %% assert
+ = App
= find_app(Alias, Apps),
- peer_cb({ModX, peer_down, [SvcName, TC]}, Alias).
+ peer_cb(App, peer_down, [SvcName, TC]).
-%%% ---------------------------------------------------------------------------
-%%% # watchdog_down/2
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # watchdog_down/2
+%% ---------------------------------------------------------------------------
%% Watchdog process has died.
@@ -1172,9 +1126,9 @@ tc(true, {Ref, Type, Opts}, #state{service_name = SvcName}
tc(false = No, _, _) -> %% removed
No.
-%%% ---------------------------------------------------------------------------
-%%% # close/2
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # close/2
+%% ---------------------------------------------------------------------------
%% The watchdog doesn't start a new fsm in the accept case, it
%% simply stays alive until someone tells it to die in order for
@@ -1207,9 +1161,9 @@ c(Pid, false, _Opts) ->
%% which a new connection attempt is expected of a connecting peer.
%% The value should be greater than the peer's Tc + jitter.
-%%% ---------------------------------------------------------------------------
-%%% # reconnect/2
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # reconnect/2
+%% ---------------------------------------------------------------------------
reconnect(Pid, #state{service_name = SvcName,
watchdogT = WatchdogT}) ->
@@ -1219,9 +1173,9 @@ reconnect(Pid, #state{service_name = SvcName,
= fetch(WatchdogT, Pid),
send_event(SvcName, {reconnect, Ref, Opts}).
-%%% ---------------------------------------------------------------------------
-%%% # call_module/4
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # call_module/4
+%% ---------------------------------------------------------------------------
%% Backwards compatibility and never documented/advertised. May be
%% removed.
@@ -1243,10 +1197,10 @@ call_module(Mod, Req, From, #state{service
{reply, {error, Reason}, S}
end.
-cm([#diameter_app{module = ModX, alias = Alias}], Req, From, Svc) ->
- MFA = {ModX, handle_call, [Req, From, Svc]},
+cm([#diameter_app{alias = Alias} = App], Req, From, Svc) ->
+ Args = [Req, From, Svc],
- try state_cb(MFA, Alias) of
+ try state_cb(App, handle_call, Args) of
{noreply = T, ModS} ->
mod_state(Alias, ModS),
T;
@@ -1254,11 +1208,13 @@ cm([#diameter_app{module = ModX, alias = Alias}], Req, From, Svc) ->
mod_state(Alias, ModS),
{T, RC};
T ->
- diameter_lib:error_report({invalid, T}, MFA),
+ diameter_lib:error_report({invalid, T},
+ {App, handle_call, Args}),
invalid
catch
E: Reason ->
- diameter_lib:error_report({failure, {E, Reason, ?STACK}}, MFA),
+ diameter_lib:error_report({failure, {E, Reason, ?STACK}},
+ {App, handle_call, Args}),
failure
end;
@@ -1268,1265 +1224,9 @@ cm([], _, _, _) ->
cm([_,_|_], _, _, _) ->
multiple.
-%%% ---------------------------------------------------------------------------
-%%% # send_request/6
-%%% ---------------------------------------------------------------------------
-
-%% Send an outgoing request in its dedicated process.
-%%
-%% Note that both encode of the outgoing request and of the received
-%% answer happens in this process. It's also this process that replies
-%% to the caller. The service process only handles the state-retaining
-%% callbacks.
-%%
-%% The mod field of the #diameter_app{} here includes any extra
-%% arguments passed to diameter:call/2.
-
-send_request({TPid, Caps, App} = T, Mask, Msg, Opts, Caller, SvcName) ->
- #diameter_app{module = ModX}
- = App,
-
- Pkt = make_prepare_packet(Mask, Msg),
-
- send_req(cb(ModX, prepare_request, [Pkt, SvcName, {TPid, Caps}]),
- Pkt,
- T,
- Opts,
- Caller,
- SvcName,
- []).
-
-send_req({send, P}, Pkt, T, Opts, Caller, SvcName, Fs) ->
- send_req(make_request_packet(P, Pkt), T, Opts, Caller, SvcName, Fs);
-
-send_req({discard, Reason} , _, _, _, _, _, _) ->
- {error, Reason};
-
-send_req(discard, _, _, _, _, _, _) ->
- {error, discarded};
-
-send_req({eval_packet, RC, F}, Pkt, T, Opts, Caller, SvcName, Fs) ->
- send_req(RC, Pkt, T, Opts, Caller, SvcName, [F|Fs]);
-
-send_req(E, _, {_, _, App}, _, _, _, _) ->
- ?ERROR({invalid_return, prepare_request, App, E}).
-
-%% make_prepare_packet/2
-%%
-%% Turn an outgoing request as passed to call/4 into a diameter_packet
-%% record in preparation for a prepare_request callback.
-
-make_prepare_packet(_, Bin)
- when is_binary(Bin) ->
- #diameter_packet{header = diameter_codec:decode_header(Bin),
- bin = Bin};
-
-make_prepare_packet(Mask, #diameter_packet{msg = [#diameter_header{} = Hdr
- | Avps]}
- = Pkt) ->
- Pkt#diameter_packet{msg = [make_prepare_header(Mask, Hdr) | Avps]};
-
-make_prepare_packet(Mask, #diameter_packet{header = Hdr} = Pkt) ->
- Pkt#diameter_packet{header = make_prepare_header(Mask, Hdr)};
-
-make_prepare_packet(Mask, Msg) ->
- make_prepare_packet(Mask, #diameter_packet{msg = Msg}).
-
-%% make_prepare_header/2
-
-make_prepare_header(Mask, undefined) ->
- Seq = diameter_session:sequence(Mask),
- make_prepare_header(#diameter_header{end_to_end_id = Seq,
- hop_by_hop_id = Seq});
-
-make_prepare_header(Mask, #diameter_header{end_to_end_id = undefined,
- hop_by_hop_id = undefined}
- = H) ->
- Seq = diameter_session:sequence(Mask),
- make_prepare_header(H#diameter_header{end_to_end_id = Seq,
- hop_by_hop_id = Seq});
-
-make_prepare_header(Mask, #diameter_header{end_to_end_id = undefined} = H) ->
- Seq = diameter_session:sequence(Mask),
- make_prepare_header(H#diameter_header{end_to_end_id = Seq});
-
-make_prepare_header(Mask, #diameter_header{hop_by_hop_id = undefined} = H) ->
- Seq = diameter_session:sequence(Mask),
- make_prepare_header(H#diameter_header{hop_by_hop_id = Seq});
-
-make_prepare_header(_, Hdr) ->
- make_prepare_header(Hdr).
-
-%% make_prepare_header/1
-
-make_prepare_header(#diameter_header{version = undefined} = Hdr) ->
- make_prepare_header(Hdr#diameter_header{version = ?DIAMETER_VERSION});
-
-make_prepare_header(#diameter_header{} = Hdr) ->
- Hdr;
-
-make_prepare_header(T) ->
- ?ERROR({invalid_header, T}).
-
-%% make_request_packet/2
-%%
-%% Reconstruct a diameter_packet from the return value of
-%% prepare_request or prepare_retransmit callback.
-
-make_request_packet(Bin, _)
- when is_binary(Bin) ->
- make_prepare_packet(false, Bin);
-
-make_request_packet(#diameter_packet{msg = [#diameter_header{} | _]}
- = Pkt,
- _) ->
- Pkt;
-
-%% Returning a diameter_packet with no header from a prepare_request
-%% or prepare_retransmit callback retains the header passed into it.
-%% This is primarily so that the end to end and hop by hop identifiers
-%% are retained.
-make_request_packet(#diameter_packet{header = Hdr} = Pkt,
- #diameter_packet{header = Hdr0}) ->
- Pkt#diameter_packet{header = fold_record(Hdr0, Hdr)};
-
-make_request_packet(Msg, Pkt) ->
- Pkt#diameter_packet{msg = Msg}.
-
-%% fold_record/2
-
-fold_record(undefined, R) ->
- R;
-fold_record(Rec, R) ->
- diameter_lib:fold_tuple(2, Rec, R).
-
-%% send_req/6
-
-send_req(Pkt, {TPid, Caps, App}, Opts, Caller, SvcName, Fs) ->
- #diameter_app{alias = Alias,
- dictionary = Dict,
- module = ModX,
- options = [{answer_errors, AE} | _]}
- = App,
-
- EPkt = encode(Dict, Pkt, Fs),
-
- #options{filter = Filter,
- timeout = Timeout}
- = Opts,
-
- Req = #request{packet = Pkt,
- from = Caller,
- handler = self(),
- transport = TPid,
- caps = Caps,
- app = Alias,
- filter = Filter,
- dictionary = Dict,
- module = ModX},
-
- try
- TRef = send_request(TPid, EPkt, Req, Timeout),
- ack(Caller),
- handle_answer(SvcName, AE, recv_answer(Timeout, SvcName, {TRef, Req}))
- after
- erase_request(EPkt)
- end.
-
-%% Tell caller a send has been attempted.
-ack({Pid, Ref}) ->
- Pid ! Ref.
-
-%% recv_answer/3
-
-recv_answer(Timeout,
- SvcName,
- {TRef, #request{from = {_, Ref}, packet = RPkt} = Req}
- = T) ->
-
- %% Matching on TRef below ensures we ignore messages that pertain
- %% to a previous transport prior to failover. The answer message
- %% includes the #request{} since it's not necessarily Req; that
- %% is, from the last peer to which we've transmitted.
-
- receive
- {answer = A, Ref, Rq, Pkt} -> %% Answer from peer
- {A, Rq, Pkt};
- {timeout = Reason, TRef, _} -> %% No timely reply
- {error, Req, Reason};
- {failover = Reason, TRef, false} -> %% No alternate peer
- {error, Req, Reason};
- {failover, TRef, Transport} -> %% Resend to alternate peer
- try_retransmit(Timeout, SvcName, Req, Transport);
- {failover, TRef} -> %% May have missed failover notification
- Seqs = diameter_codec:sequence_numbers(RPkt),
- Pid = whois(SvcName),
- is_pid(Pid) andalso (Pid ! {failover, TRef, Seqs}),
- recv_answer(Timeout, SvcName, T)
- end.
-%% Note that failover starts a new timer and that expiry of an old
-%% timer value is ignored. This means that an answer could be accepted
-%% from a peer after timeout in the case of failover.
-
-try_retransmit(Timeout, SvcName, Req, Transport) ->
- try retransmit(Transport, Req, SvcName, Timeout) of
- T -> recv_answer(Timeout, SvcName, T)
- catch
- ?FAILURE(Reason) -> {error, Req, Reason}
- end.
-
-%% handle_error/3
-
-handle_error(Req, Reason, SvcName) ->
- #request{module = ModX,
- packet = Pkt,
- transport = TPid,
- caps = Caps}
- = Req,
- cb(ModX, handle_error, [Reason, msg(Pkt), SvcName, {TPid, Caps}]).
-
-msg(#diameter_packet{msg = undefined, bin = Bin}) ->
- Bin;
-msg(#diameter_packet{msg = Msg}) ->
- Msg.
-
-%% encode/3
-
-encode(Dict, Pkt, Fs) ->
- P = encode(Dict, Pkt),
- eval_packet(P, Fs),
- P.
-
-%% encode/2
-
-%% Note that prepare_request can return a diameter_packet containing
-%% header or transport_data. Even allow the returned record to contain
-%% an encoded binary. This isn't the usual case but could some in
-%% handy, for test at least. (For example, to send garbage.)
-
-%% The normal case: encode the returned message.
-encode(Dict, #diameter_packet{msg = Msg, bin = undefined} = Pkt) ->
- D = pick_dictionary([Dict, ?BASE], Msg),
- diameter_codec:encode(D, Pkt);
-
-%% Callback has returned an encoded binary: just send.
-encode(_, #diameter_packet{} = Pkt) ->
- Pkt.
-
-%% pick_dictionary/2
-
-%% Pick the first dictionary that declares the application id in the
-%% specified header.
-pick_dictionary(Ds, [#diameter_header{application_id = Id} | _]) ->
- pd(Ds, fun(D) -> Id = D:id() end);
-
-%% Pick the first dictionary that knows the specified message name.
-pick_dictionary(Ds, [MsgName|_]) ->
- pd(Ds, fun(D) -> D:msg2rec(MsgName) end);
-
-%% Pick the first dictionary that knows the name of the specified
-%% message record.
-pick_dictionary(Ds, Rec) ->
- Name = element(1, Rec),
- pd(Ds, fun(D) -> D:rec2msg(Name) end).
-
-pd([D|Ds], F) ->
- try
- F(D),
- D
- catch
- error:_ ->
- pd(Ds, F)
- end;
-
-pd([], _) ->
- ?ERROR(no_dictionary).
-
-%% send_request/4
-
-send_request(TPid, #diameter_packet{bin = Bin} = Pkt, Req, Timeout)
- when node() == node(TPid) ->
- %% Store the outgoing request before sending to avoid a race with
- %% reply reception.
- TRef = store_request(TPid, Bin, Req, Timeout),
- send(TPid, Pkt),
- TRef;
-
-%% Send using a remote transport: spawn a process on the remote node
-%% to relay the answer.
-send_request(TPid, #diameter_packet{} = Pkt, Req, Timeout) ->
- TRef = erlang:start_timer(Timeout, self(), timeout),
- T = {TPid, Pkt, Req, Timeout, TRef},
- spawn(node(TPid), ?MODULE, send, [T]),
- TRef.
-
-%% send/1
-
-send({TPid, Pkt, #request{handler = Pid} = Req, Timeout, TRef}) ->
- Ref = send_request(TPid, Pkt, Req#request{handler = self()}, Timeout),
- Pid ! reref(receive T -> T end, Ref, TRef).
-
-reref({T, Ref, R}, Ref, TRef) ->
- {T, TRef, R};
-reref(T, _, _) ->
- T.
-
-%% send/2
-
-send(Pid, Pkt) ->
- Pid ! {send, Pkt}.
-
-%% retransmit/4
-
-retransmit({TPid, Caps, #diameter_app{alias = Alias} = App} = T,
- #request{app = Alias, packet = Pkt0}
- = Req,
- SvcName,
- Timeout) ->
- have_request(Pkt0, TPid) %% Don't failover to a peer we've
- andalso ?THROW(timeout), %% already sent to.
-
- #diameter_packet{header = Hdr0} = Pkt0,
- Hdr = Hdr0#diameter_header{is_retransmitted = true},
- Pkt = Pkt0#diameter_packet{header = Hdr},
-
- resend_req(cb(App, prepare_retransmit, [Pkt, SvcName, {TPid, Caps}]),
- T,
- Req#request{packet = Pkt},
- Timeout,
- []).
-
-resend_req({send, P}, T, #request{packet = Pkt} = Req, Timeout, Fs) ->
- retransmit(make_request_packet(P, Pkt), T, Req, Timeout, Fs);
-
-resend_req({discard, Reason}, _, _, _, _) ->
- ?THROW(Reason);
-
-resend_req(discard, _, _, _, _) ->
- ?THROW(discarded);
-
-resend_req({eval_packet, RC, F}, T, Req, Timeout, Fs) ->
- resend_req(RC, T, Req, Timeout, [F|Fs]);
-
-resend_req(T, {_, _, App}, _, _, _) ->
- ?ERROR({invalid_return, prepare_retransmit, App, T}).
-
-%% retransmit/6
-
-retransmit(Pkt, {TPid, Caps, _}, #request{dictionary = D} = Req0, Tmo, Fs) ->
- EPkt = encode(D, Pkt, Fs),
-
- Req = Req0#request{transport = TPid,
- packet = Pkt,
- caps = Caps},
-
- ?LOG(retransmission, Req),
- TRef = send_request(TPid, EPkt, Req, Tmo),
- {TRef, Req}.
-
-%% store_request/4
-
-store_request(TPid, Bin, Req, Timeout) ->
- Seqs = diameter_codec:sequence_numbers(Bin),
- TRef = erlang:start_timer(Timeout, self(), timeout),
- ets:insert(?REQUEST_TABLE, {Seqs, Req, TRef}),
- ets:member(?REQUEST_TABLE, TPid)
- orelse (self() ! {failover, TRef}), %% possibly missed failover
- TRef.
-
-%% lookup_request/2
-
-lookup_request(Msg, TPid)
- when is_pid(TPid) ->
- lookup(Msg, TPid, '_');
-
-lookup_request(Msg, TRef)
- when is_reference(TRef) ->
- lookup(Msg, '_', TRef).
-
-lookup(Msg, TPid, TRef) ->
- Seqs = diameter_codec:sequence_numbers(Msg),
- Spec = [{{Seqs, #request{transport = TPid, _ = '_'}, TRef},
- [],
- ['$_']}],
- case ets:select(?REQUEST_TABLE, Spec) of
- [{_, Req, _}] ->
- Req;
- [] ->
- false
- end.
-
-%% erase_request/1
-
-erase_request(Pkt) ->
- ets:delete(?REQUEST_TABLE, diameter_codec:sequence_numbers(Pkt)).
-
-%% match_requests/1
-
-match_requests(TPid) ->
- Pat = {'_', #request{transport = TPid, _ = '_'}, '_'},
- ets:select(?REQUEST_TABLE, [{Pat, [], ['$_']}]).
-
-%% have_request/2
-
-have_request(Pkt, TPid) ->
- Seqs = diameter_codec:sequence_numbers(Pkt),
- Pat = {Seqs, #request{transport = TPid, _ = '_'}, '_'},
- '$end_of_table' /= ets:select(?REQUEST_TABLE, [{Pat, [], ['$_']}], 1).
-
-%% request_peer_up/1
-
-%% Insert an element that is used to detect whether or not there has
-%% been a failover when inserting an outgoing request.
-request_peer_up(TPid) ->
- ets:insert(?REQUEST_TABLE, {TPid}).
-
-%% request_peer_down/2
-
-request_peer_down(TPid, S) ->
- ets:delete(?REQUEST_TABLE, TPid),
- lists:foreach(fun(T) -> failover(T,S) end, match_requests(TPid)).
-%% Note that a request process can store its request after failover
-%% notifications are sent here: store_request/4 sends the notification
-%% in that case. Note also that we'll send as many notifications to a
-%% given handler as there are peers its sent to. All but one of these
-%% will be ignored.
-
-%%% ---------------------------------------------------------------------------
-%%% recv_request/3
-%%% ---------------------------------------------------------------------------
-
-recv_request(TPid, Pkt, {PeerT, SvcName, Apps, Mask}) ->
- try ets:lookup(PeerT, TPid) of
- [C] ->
- recv_request(C, TPid, Pkt, SvcName, Apps, Mask);
- [] -> %% transport has gone down
- ok
- catch
- error: badarg -> %% service has gone down (and taken table with it)
- ok
- end.
-
-%% recv_request/5
-
-recv_request(#peer{apps = SApps, caps = Caps},
- TPid,
- Pkt,
- SvcName,
- Apps,
- Mask) ->
- #diameter_caps{origin_host = {OH,_},
- origin_realm = {OR,_}}
- = Caps,
-
- #diameter_packet{header = #diameter_header{application_id = Id}}
- = Pkt,
-
- recv_request(find_recv_app(Id, SApps),
- {SvcName, OH, OR},
- TPid,
- Apps,
- Mask,
- Caps,
- Pkt).
-
-%% find_recv_app/2
-
-%% No one should be sending the relay identifier.
-find_recv_app(?APP_ID_RELAY, _) ->
- false;
-
-%% With any other id we either support it locally or as a relay.
-find_recv_app(Id, SApps) ->
- keyfind([Id, ?APP_ID_RELAY], 1, SApps).
-
-%% keyfind/3
-
-keyfind([], _, _) ->
- false;
-keyfind([Key | Rest], Pos, L) ->
- case lists:keyfind(Key, Pos, L) of
- false ->
- keyfind(Rest, Pos, L);
- T ->
- T
- end.
-
-%% recv_request/7
-
-recv_request({Id, Alias}, T, TPid, Apps, Mask, Caps, Pkt) ->
- #diameter_app{dictionary = Dict}
- = A
- = find_app(Alias, Apps),
- recv_request(T,
- {TPid, Caps},
- A,
- Mask,
- diameter_codec:decode(Id, Dict, Pkt));
-%% Note that the decode is different depending on whether or not Id is
-%% ?APP_ID_RELAY.
-
-%% DIAMETER_APPLICATION_UNSUPPORTED 3007
-%% A request was sent for an application that is not supported.
-
-recv_request(false, T, TPid, _, _, _, Pkt) ->
- As = collect_avps(Pkt),
- protocol_error(3007, T, TPid, Pkt#diameter_packet{avps = As}).
-
-collect_avps(Pkt) ->
- case diameter_codec:collect_avps(Pkt) of
- {_Bs, As} ->
- As;
- As ->
- As
- end.
-
-%% recv_request/5
-
-%% Wrong number of bits somewhere in the message: reply.
-%%
-%% DIAMETER_INVALID_AVP_BITS 3009
-%% A request was received that included an AVP whose flag bits are
-%% set to an unrecognized value, or that is inconsistent with the
-%% AVP's definition.
-%%
-recv_request(T, {TPid, _}, _, _, #diameter_packet{errors = [Bs | _]} = Pkt)
- when is_bitstring(Bs) ->
- protocol_error(3009, T, TPid, Pkt);
-
-%% Either we support this application but don't recognize the command
-%% or we're a relay and the command isn't proxiable.
-%%
-%% DIAMETER_COMMAND_UNSUPPORTED 3001
-%% The Request contained a Command-Code that the receiver did not
-%% recognize or support. This MUST be used when a Diameter node
-%% receives an experimental command that it does not understand.
-%%
-recv_request(T,
- {TPid, _},
- #diameter_app{id = Id},
- _,
- #diameter_packet{header = #diameter_header{is_proxiable = P},
- msg = M}
- = Pkt)
- when ?APP_ID_RELAY /= Id, undefined == M;
- ?APP_ID_RELAY == Id, not P ->
- protocol_error(3001, T, TPid, Pkt);
-
-%% Error bit was set on a request.
-%%
-%% DIAMETER_INVALID_HDR_BITS 3008
-%% A request was received whose bits in the Diameter header were
-%% either set to an invalid combination, or to a value that is
-%% inconsistent with the command code's definition.
-%%
-recv_request(T,
- {TPid, _},
- _,
- _,
- #diameter_packet{header = #diameter_header{is_error = true}}
- = Pkt) ->
- protocol_error(3008, T, TPid, Pkt);
-
-%% A message in a locally supported application or a proxiable message
-%% in the relay application. Don't distinguish between the two since
-%% each application has its own callback config. That is, the user can
-%% easily distinguish between the two cases.
-recv_request(T, TC, App, Mask, Pkt) ->
- request_cb(T, TC, App, Mask, examine(Pkt)).
-
-%% Note that there may still be errors but these aren't protocol
-%% (3xxx) errors that lead to an answer-message.
-
-request_cb({SvcName, _OH, _OR} = T, TC, App, Mask, Pkt) ->
- request_cb(cb(App, handle_request, [Pkt, SvcName, TC]),
- App,
- Mask,
- T,
- TC,
- [],
- Pkt).
-
-%% examine/1
-%%
-%% Look for errors in a decoded message. Length errors result in
-%% decode failure in diameter_codec.
-
-examine(#diameter_packet{header = #diameter_header{version
- = ?DIAMETER_VERSION}}
- = Pkt) ->
- Pkt;
-
-%% DIAMETER_UNSUPPORTED_VERSION 5011
-%% This error is returned when a request was received, whose version
-%% number is unsupported.
-
-examine(#diameter_packet{errors = Es} = Pkt) ->
- Pkt#diameter_packet{errors = [5011 | Es]}.
-%% It's odd/unfortunate that this isn't a protocol error.
-
-%% request_cb/7
-
-%% A reply may be an answer-message, constructed either here or by
-%% the handle_request callback. The header from the incoming request
-%% is passed into the encode so that it can retrieve the relevant
-%% command code in this case. It will also then ignore Dict and use
-%% the base encoder.
-request_cb({reply, Ans},
- #diameter_app{dictionary = Dict},
- _,
- _,
- {TPid, _},
- Fs,
- Pkt) ->
- reply(Ans, Dict, TPid, Fs, Pkt);
-
-%% An 3xxx result code, for which the E-bit is set in the header.
-request_cb({protocol_error, RC}, _, _, T, {TPid, _}, Fs, Pkt)
- when 3000 =< RC, RC < 4000 ->
- protocol_error(RC, T, TPid, Fs, Pkt);
-
-%% RFC 3588 says we must reply 3001 to anything unrecognized or
-%% unsupported. 'noreply' is undocumented (and inappropriately named)
-%% backwards compatibility for this, protocol_error the documented
-%% alternative.
-request_cb(noreply, _, _, T, {TPid, _}, Fs, Pkt) ->
- protocol_error(3001, T, TPid, Fs, Pkt);
-
-%% Relay a request to another peer. This is equivalent to doing an
-%% explicit call/4 with the message in question except that (1) a loop
-%% will be detected by examining Route-Record AVP's, (3) a
-%% Route-Record AVP will be added to the outgoing request and (3) the
-%% End-to-End Identifier will default to that in the
-%% #diameter_header{} without the need for an end_to_end_identifier
-%% option.
-%%
-%% relay and proxy are similar in that they require the same handling
-%% with respect to Route-Record and End-to-End identifier. The
-%% difference is that a proxy advertises specific applications, while
-%% a relay advertises the relay application. If a callback doesn't
-%% want to distinguish between the cases in the callback return value
-%% then 'resend' is a neutral alternative.
-%%
-request_cb({A, Opts},
- #diameter_app{id = Id}
- = App,
- Mask,
- T,
- TC,
- Fs,
- Pkt)
- when A == relay, Id == ?APP_ID_RELAY;
- A == proxy, Id /= ?APP_ID_RELAY;
- A == resend ->
- resend(Opts, App, Mask, T, TC, Fs, Pkt);
-
-request_cb(discard, _, _, _, _, _, _) ->
- ok;
-
-request_cb({eval_packet, RC, F}, App, Mask, T, TC, Fs, Pkt) ->
- request_cb(RC, App, Mask, T, TC, [F|Fs], Pkt);
-
-request_cb({eval, RC, F}, App, Mask, T, TC, Fs, Pkt) ->
- request_cb(RC, App, Mask, T, TC, Fs, Pkt),
- diameter_lib:eval(F).
-
-%% protocol_error/5
-
-protocol_error(RC, {_, OH, OR}, TPid, Fs, Pkt) ->
- #diameter_packet{avps = Avps, errors = Es} = Pkt,
- ?LOG({error, RC}, Pkt),
- reply(answer_message({OH, OR, RC}, Avps),
- ?BASE,
- TPid,
- Fs,
- Pkt#diameter_packet{errors = [RC | Es]}).
-%% Note that reply/5 may set the result code once more. It's set in
-%% answer_message/2 in case reply/5 doesn't.
-
-%% protocol_error/4
-
-protocol_error(RC, T, TPid, Pkt) ->
- protocol_error(RC, T, TPid, [], Pkt).
-
-%% resend/7
-%%
-%% Resend a message as a relay or proxy agent.
-
-resend(Opts,
- #diameter_app{} = App,
- Mask,
- {_SvcName, OH, _OR} = T,
- {_TPid, _Caps} = TC,
- Fs,
- #diameter_packet{avps = Avps} = Pkt) ->
- {Code, _Flags, Vid} = ?BASE:avp_header('Route-Record'),
- resend(is_loop(Code, Vid, OH, Avps), Opts, App, Mask, T, TC, Fs, Pkt).
-
-%% DIAMETER_LOOP_DETECTED 3005
-%% An agent detected a loop while trying to get the message to the
-%% intended recipient. The message MAY be sent to an alternate peer,
-%% if one is available, but the peer reporting the error has
-%% identified a configuration problem.
-
-resend(true, _, _, _, T, {TPid, _}, Fs, Pkt) -> %% Route-Record loop
- protocol_error(3005, T, TPid, Fs, Pkt);
-
-%% 6.1.8. Relaying and Proxying Requests
-%%
-%% A relay or proxy agent MUST append a Route-Record AVP to all requests
-%% forwarded. The AVP contains the identity of the peer the request was
-%% received from.
-
-resend(false,
- Opts,
- App,
- Mask,
- {SvcName, _, _} = T,
- {TPid, #diameter_caps{origin_host = {_, OH}}},
- Fs,
- #diameter_packet{header = Hdr0,
- avps = Avps}
- = Pkt) ->
- Route = #diameter_avp{data = {?BASE, 'Route-Record', OH}},
- Seq = diameter_session:sequence(Mask),
- Hdr = Hdr0#diameter_header{hop_by_hop_id = Seq},
- Msg = [Hdr, Route | Avps],
- resend(call(SvcName, App, Msg, Opts), T, TPid, Fs, Pkt).
-%% The incoming request is relayed with the addition of a
-%% Route-Record. Note the requirement on the return from call/4 below,
-%% which places a requirement on the value returned by the
-%% handle_answer callback of the application module in question.
-%%
-%% Note that there's nothing stopping the request from being relayed
-%% back to the sender. A pick_peer callback may want to avoid this but
-%% a smart peer might recognize the potential loop and choose another
-%% route. A less smart one will probably just relay the request back
-%% again and force us to detect the loop. A pick_peer that wants to
-%% avoid this can specify filter to avoid the possibility.
-%% Eg. {neg, {host, OH} where #diameter_caps{origin_host = {OH, _}}.
-%%
-%% RFC 6.3 says that a relay agent does not modify Origin-Host but
-%% says nothing about a proxy. Assume it should behave the same way.
-
-%% resend/4
-%%
-%% Relay a reply to a relayed request.
-
-%% Answer from the peer: reset the hop by hop identifier and send.
-resend(#diameter_packet{bin = B}
- = Pkt,
- _,
- TPid,
- Fs,
- #diameter_packet{header = #diameter_header{hop_by_hop_id = Id},
- transport_data = TD}) ->
- P = Pkt#diameter_packet{bin = diameter_codec:hop_by_hop_id(Id, B),
- transport_data = TD},
- eval_packet(P, Fs),
- send(TPid, P);
-%% TODO: counters
-
-%% Or not: DIAMETER_UNABLE_TO_DELIVER.
-resend(_, T, TPid, Fs, Pkt) ->
- protocol_error(3002, T, TPid, Fs, Pkt).
-
-%% is_loop/4
-%%
-%% Is there a Route-Record AVP with our Origin-Host?
-
-is_loop(Code,
- Vid,
- Bin,
- [#diameter_avp{code = Code, vendor_id = Vid, data = Bin} | _]) ->
- true;
-
-is_loop(_, _, _, []) ->
- false;
-
-is_loop(Code, Vid, OH, [_ | Avps])
- when is_binary(OH) ->
- is_loop(Code, Vid, OH, Avps);
-
-is_loop(Code, Vid, OH, Avps) ->
- is_loop(Code, Vid, ?BASE:avp(encode, OH, 'Route-Record'), Avps).
-
-%% reply/5
-%%
-%% Send a locally originating reply.
-
-%% Skip the setting of Result-Code and Failed-AVP's below. This is
-%% currently undocumented.
-reply([Msg], Dict, TPid, Fs, Pkt)
- when is_list(Msg);
- is_tuple(Msg) ->
- reply(Msg, Dict, TPid, Fs, Pkt#diameter_packet{errors = []});
-
-%% No errors or a diameter_header/avp list.
-reply(Msg, Dict, TPid, Fs, #diameter_packet{errors = Es} = ReqPkt)
- when [] == Es;
- is_record(hd(Msg), diameter_header) ->
- Pkt = diameter_codec:encode(Dict, make_answer_packet(Msg, ReqPkt)),
- eval_packet(Pkt, Fs),
- incr(send, Pkt, Dict, TPid), %% count result codes in sent answers
- send(TPid, Pkt);
-
-%% Or not: set Result-Code and Failed-AVP AVP's.
-reply(Msg, Dict, TPid, Fs, #diameter_packet{errors = [H|_] = Es} = Pkt) ->
- reply(rc(Msg, rc(H), [A || {_,A} <- Es], Dict),
- Dict,
- TPid,
- Fs,
- Pkt#diameter_packet{errors = []}).
-
-eval_packet(Pkt, Fs) ->
- lists:foreach(fun(F) -> diameter_lib:eval([F,Pkt]) end, Fs).
-
-%% make_answer_packet/2
-
-%% A reply message clears the R and T flags and retains the P flag.
-%% The E flag will be set at encode. 6.2 of 3588 requires the same P
-%% flag on an answer as on the request. A #diameter_packet{} returned
-%% from a handle_request callback can circumvent this by setting its
-%% own header values.
-make_answer_packet(#diameter_packet{header = Hdr,
- msg = Msg,
- transport_data = TD},
- #diameter_packet{header = ReqHdr}) ->
- Hdr0 = ReqHdr#diameter_header{version = ?DIAMETER_VERSION,
- is_request = false,
- is_error = undefined,
- is_retransmitted = false},
- #diameter_packet{header = fold_record(Hdr0, Hdr),
- msg = Msg,
- transport_data = TD};
-
-%% Binaries and header/avp lists are sent as-is.
-make_answer_packet(Bin, #diameter_packet{transport_data = TD})
- when is_binary(Bin) ->
- #diameter_packet{bin = Bin,
- transport_data = TD};
-make_answer_packet([#diameter_header{} | _] = Msg,
- #diameter_packet{transport_data = TD}) ->
- #diameter_packet{msg = Msg,
- transport_data = TD};
-
-%% Otherwise, preserve transport_data.
-make_answer_packet(Msg, #diameter_packet{transport_data = TD} = Pkt) ->
- make_answer_packet(#diameter_packet{msg = Msg, transport_data = TD}, Pkt).
-
-%% rc/1
-
-rc({RC, _}) ->
- RC;
-rc(RC) ->
- RC.
-
-%% rc/4
-
-rc(#diameter_packet{msg = Rec} = Pkt, RC, Failed, Dict) ->
- Pkt#diameter_packet{msg = rc(Rec, RC, Failed, Dict)};
-
-rc(Rec, RC, Failed, Dict)
- when is_integer(RC) ->
- set(Rec,
- lists:append([rc(Rec, {'Result-Code', RC}, Dict),
- failed_avp(Rec, Failed, Dict)]),
- Dict).
-
-%% Reply as name and tuple list ...
-set([_|_] = Ans, Avps, _) ->
- Ans ++ Avps; %% Values nearer tail take precedence.
-
-%% ... or record.
-set(Rec, Avps, Dict) ->
- Dict:'#set-'(Avps, Rec).
-
-%% rc/3
-%%
-%% Turn the result code into a list if its optional and only set it if
-%% the arity is 1 or {0,1}. In other cases (which probably shouldn't
-%% exist in practise) we can't know what's appropriate.
-
-rc([MsgName | _], {'Result-Code' = K, RC} = T, Dict) ->
- case Dict:avp_arity(MsgName, 'Result-Code') of
- 1 -> [T];
- {0,1} -> [{K, [RC]}];
- _ -> []
- end;
-
-rc(Rec, T, Dict) ->
- rc([Dict:rec2msg(element(1, Rec))], T, Dict).
-
-%% failed_avp/3
-
-failed_avp(_, [] = No, _) ->
- No;
-
-failed_avp(Rec, Failed, Dict) ->
- [fa(Rec, [{'AVP', Failed}], Dict)].
-
-%% Reply as name and tuple list ...
-fa([MsgName | Values], FailedAvp, Dict) ->
- R = Dict:msg2rec(MsgName),
- try
- Dict:'#info-'(R, {index, 'Failed-AVP'}),
- {'Failed-AVP', [FailedAvp]}
- catch
- error: _ ->
- Avps = proplists:get_value('AVP', Values, []),
- A = #diameter_avp{name = 'Failed-AVP',
- value = FailedAvp},
- {'AVP', [A|Avps]}
- end;
-
-%% ... or record.
-fa(Rec, FailedAvp, Dict) ->
- try
- {'Failed-AVP', [FailedAvp]}
- catch
- error: _ ->
- Avps = Dict:'get-'('AVP', Rec),
- A = #diameter_avp{name = 'Failed-AVP',
- value = FailedAvp},
- {'AVP', [A|Avps]}
- end.
-
-%% 3. Diameter Header
-%%
-%% E(rror) - If set, the message contains a protocol error,
-%% and the message will not conform to the ABNF
-%% described for this command. Messages with the 'E'
-%% bit set are commonly referred to as error
-%% messages. This bit MUST NOT be set in request
-%% messages. See Section 7.2.
-
-%% 3.2. Command Code ABNF specification
-%%
-%% e-bit = ", ERR"
-%% ; If present, the 'E' bit in the Command
-%% ; Flags is set, indicating that the answer
-%% ; message contains a Result-Code AVP in
-%% ; the "protocol error" class.
-
-%% 7.1.3. Protocol Errors
-%%
-%% Errors that fall within the Protocol Error category SHOULD be treated
-%% on a per-hop basis, and Diameter proxies MAY attempt to correct the
-%% error, if it is possible. Note that these and only these errors MUST
-%% only be used in answer messages whose 'E' bit is set.
-
-%% Thus, only construct answers to protocol errors. Other errors
-%% require an message-specific answer and must be handled by the
-%% application.
-
-%% 6.2. Diameter Answer Processing
-%%
-%% When a request is locally processed, the following procedures MUST be
-%% applied to create the associated answer, in addition to any
-%% additional procedures that MAY be discussed in the Diameter
-%% application defining the command:
-%%
-%% - The same Hop-by-Hop identifier in the request is used in the
-%% answer.
-%%
-%% - The local host's identity is encoded in the Origin-Host AVP.
-%%
-%% - The Destination-Host and Destination-Realm AVPs MUST NOT be
-%% present in the answer message.
-%%
-%% - The Result-Code AVP is added with its value indicating success or
-%% failure.
-%%
-%% - If the Session-Id is present in the request, it MUST be included
-%% in the answer.
-%%
-%% - Any Proxy-Info AVPs in the request MUST be added to the answer
-%% message, in the same order they were present in the request.
-%%
-%% - The 'P' bit is set to the same value as the one in the request.
-%%
-%% - The same End-to-End identifier in the request is used in the
-%% answer.
-%%
-%% Note that the error messages (see Section 7.3) are also subjected to
-%% the above processing rules.
-
-%% 7.3. Error-Message AVP
-%%
-%% The Error-Message AVP (AVP Code 281) is of type UTF8String. It MAY
-%% accompany a Result-Code AVP as a human readable error message. The
-%% Error-Message AVP is not intended to be useful in real-time, and
-%% SHOULD NOT be expected to be parsed by network entities.
-
-%% answer_message/2
-
-answer_message({OH, OR, RC}, Avps) ->
- {Code, _, Vid} = ?BASE:avp_header('Session-Id'),
- ['answer-message', {'Origin-Host', OH},
- {'Origin-Realm', OR},
- {'Result-Code', RC}
- | session_id(Code, Vid, Avps)].
-
-session_id(Code, Vid, Avps)
- when is_list(Avps) ->
- try
- {value, #diameter_avp{data = D}} = find_avp(Code, Vid, Avps),
- [{'Session-Id', [?BASE:avp(decode, D, 'Session-Id')]}]
- catch
- error: _ ->
- []
- end.
-
-%% find_avp/3
-
-find_avp(Code, Vid, Avps)
- when is_integer(Code), (undefined == Vid orelse is_integer(Vid)) ->
- find(fun(A) -> is_avp(Code, Vid, A) end, Avps).
-
-%% The final argument here could be a list of AVP's, depending on the case,
-%% but we're only searching at the top level.
-is_avp(Code, Vid, #diameter_avp{code = Code, vendor_id = Vid}) ->
- true;
-is_avp(_, _, _) ->
- false.
-
-find(_, []) ->
- false;
-find(Pred, [H|T]) ->
- case Pred(H) of
- true ->
- {value, H};
- false ->
- find(Pred, T)
- end.
-
-%% 7. Error Handling
-%%
-%% There are certain Result-Code AVP application errors that require
-%% additional AVPs to be present in the answer. In these cases, the
-%% Diameter node that sets the Result-Code AVP to indicate the error
-%% MUST add the AVPs. Examples are:
-%%
-%% - An unrecognized AVP is received with the 'M' bit (Mandatory bit)
-%% set, causes an answer to be sent with the Result-Code AVP set to
-%% DIAMETER_AVP_UNSUPPORTED, and the Failed-AVP AVP containing the
-%% offending AVP.
-%%
-%% - An AVP that is received with an unrecognized value causes an
-%% answer to be returned with the Result-Code AVP set to
-%% DIAMETER_INVALID_AVP_VALUE, with the Failed-AVP AVP containing the
-%% AVP causing the error.
-%%
-%% - A command is received with an AVP that is omitted, yet is
-%% mandatory according to the command's ABNF. The receiver issues an
-%% answer with the Result-Code set to DIAMETER_MISSING_AVP, and
-%% creates an AVP with the AVP Code and other fields set as expected
-%% in the missing AVP. The created AVP is then added to the Failed-
-%% AVP AVP.
-%%
-%% The Result-Code AVP describes the error that the Diameter node
-%% encountered in its processing. In case there are multiple errors,
-%% the Diameter node MUST report only the first error it encountered
-%% (detected possibly in some implementation dependent order). The
-%% specific errors that can be described by this AVP are described in
-%% the following section.
-
-%% 7.5. Failed-AVP AVP
-%%
-%% The Failed-AVP AVP (AVP Code 279) is of type Grouped and provides
-%% debugging information in cases where a request is rejected or not
-%% fully processed due to erroneous information in a specific AVP. The
-%% value of the Result-Code AVP will provide information on the reason
-%% for the Failed-AVP AVP.
-%%
-%% The possible reasons for this AVP are the presence of an improperly
-%% constructed AVP, an unsupported or unrecognized AVP, an invalid AVP
-%% value, the omission of a required AVP, the presence of an explicitly
-%% excluded AVP (see tables in Section 10), or the presence of two or
-%% more occurrences of an AVP which is restricted to 0, 1, or 0-1
-%% occurrences.
-%%
-%% A Diameter message MAY contain one Failed-AVP AVP, containing the
-%% entire AVP that could not be processed successfully. If the failure
-%% reason is omission of a required AVP, an AVP with the missing AVP
-%% code, the missing vendor id, and a zero filled payload of the minimum
-%% required length for the omitted AVP will be added.
-
-%%% ---------------------------------------------------------------------------
-%%% # handle_answer/3
-%%% ---------------------------------------------------------------------------
-
-%% Process an answer message in call-specific process.
-
-handle_answer(SvcName, _, {error, Req, Reason}) ->
- handle_error(Req, Reason, SvcName);
-
-handle_answer(SvcName,
- AnswerErrors,
- {answer, #request{dictionary = Dict} = Req, Pkt}) ->
- answer(examine(diameter_codec:decode(Dict, Pkt)),
- SvcName,
- AnswerErrors,
- Req).
-
-%% We don't really need to do a full decode if we're a relay and will
-%% just resend with a new hop by hop identifier, but might a proxy
-%% want to examine the answer?
-
-answer(Pkt, SvcName, AE, #request{transport = TPid,
- dictionary = Dict}
- = Req) ->
- try
- incr(recv, Pkt, Dict, TPid)
- of
- _ -> a(Pkt, SvcName, AE, Req)
- catch
- exit: {invalid_error_bit, _} = E ->
- a(Pkt#diameter_packet{errors = [E]}, SvcName, AE, Req)
- end.
-
-a(#diameter_packet{errors = Es} = Pkt, SvcName, AE, #request{transport = TPid,
- caps = Caps,
- packet = P}
- = Req)
- when [] == Es;
- callback == AE ->
- cb(Req, handle_answer, [Pkt, msg(P), SvcName, {TPid, Caps}]);
-
-a(Pkt, SvcName, report, Req) ->
- x(errors, handle_answer, [SvcName, Req, Pkt]);
-
-a(Pkt, SvcName, discard, Req) ->
- x({errors, handle_answer, [SvcName, Req, Pkt]}).
-
-%% Note that we don't check that the application id in the answer's
-%% header is what we expect. (TODO: Does the rfc says anything about
-%% this?)
-
-%% incr/4
-%%
-%% Increment a stats counter for an incoming or outgoing message.
-
-%% TODO: fix
-incr(_, #diameter_packet{msg = undefined}, _, _) ->
- ok;
-
-incr(recv = D, #diameter_packet{header = H, errors = [_|_]}, _, TPid) ->
- incr(TPid, {diameter_codec:msg_id(H), D, error});
-
-incr(Dir, Pkt, Dict, TPid) ->
- #diameter_packet{header = #diameter_header{is_error = E}
- = Hdr,
- msg = Rec}
- = Pkt,
-
- RC = int(get_avp_value(Dict, 'Result-Code', Rec)),
- PE = is_protocol_error(RC),
-
- %% Check that the E bit is set only for 3xxx result codes.
- (not (E orelse PE))
- orelse (E andalso PE)
- orelse x({invalid_error_bit, RC}, answer, [Dir, Pkt]),
-
- irc(TPid, Hdr, Dir, rc_counter(Dict, Rec, RC)).
-
-irc(_, _, _, undefined) ->
- false;
-
-irc(TPid, Hdr, Dir, Ctr) ->
- incr(TPid, {diameter_codec:msg_id(Hdr), Dir, Ctr}).
-
-%% incr/2
-
-incr(TPid, Counter) ->
- diameter_stats:incr(Counter, TPid, 1).
-
-%% error_counter/2
-
-%% RFC 3588, 7.6:
-%%
-%% All Diameter answer messages defined in vendor-specific
-%% applications MUST include either one Result-Code AVP or one
-%% Experimental-Result AVP.
-%%
-%% Maintain statistics assuming one or the other, not both, which is
-%% surely the intent of the RFC.
-
-rc_counter(Dict, Rec, undefined) ->
- er(get_avp_value(Dict, 'Experimental-Result', Rec));
-rc_counter(_, _, RC) ->
- {'Result-Code', RC}.
-
-%% Outgoing answers may be in any of the forms messages can be sent
-%% in. Incoming messages will be records. We're assuming here that the
-%% arity of the result code AVP's is 0 or 1.
-
-er([{_,_,N} = T | _])
- when is_integer(N) ->
- T;
-er({_,_,N} = T)
- when is_integer(N) ->
- T;
-er(_) ->
- undefined.
-
-%% Extract the first good looking integer. There's no guarantee
-%% that what we're looking for has arity 1.
-int([N|_])
- when is_integer(N) ->
- N;
-int(N)
- when is_integer(N) ->
- N;
-int(_) ->
- undefined.
-
-is_protocol_error(RC) ->
- 3000 =< RC andalso RC < 4000.
-
--spec x(any(), atom(), list()) -> no_return().
-
-%% Warn and exit request process on errors in an incoming answer.
-x(Reason, F, A) ->
- diameter_lib:warning_report(Reason, {?MODULE, F, A}),
- x(Reason).
-
-x(T) ->
- exit(T).
-
-%%% ---------------------------------------------------------------------------
-%%% # failover/[23]
-%%% ---------------------------------------------------------------------------
-
-%% Failover as a consequence of request_peer_down/2.
-failover({_, #request{handler = Pid} = Req, TRef}, S) ->
- Pid ! {failover, TRef, rt(Req, S)}.
-
-%% Failover as a consequence of store_request/4.
-failover(TRef, Seqs, S)
- when is_reference(TRef) ->
- case lookup_request(Seqs, TRef) of
- #request{} = Req ->
- failover({Seqs, Req, TRef}, S);
- false ->
- ok
- end.
-
-%% prepare_request returned a binary ...
-rt(#request{packet = #diameter_packet{msg = undefined}}, _) ->
- false; %% TODO: Not what we should do.
-
-%% ... or not.
-rt(#request{packet = #diameter_packet{msg = Msg},
- dictionary = Dict}
- = Req,
- S) ->
- find_transport(get_destination(Dict, Msg), Req, S).
-
-%%% ---------------------------------------------------------------------------
-%%% # report_status/5
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # report_status/5
+%% ---------------------------------------------------------------------------
report_status(Status,
#watchdog{ref = Ref,
@@ -2551,9 +1251,9 @@ send_event(SvcName, Info) ->
send_event(#diameter_event{service = SvcName} = E) ->
lists:foreach(fun({_, Pid}) -> Pid ! E end, subscriptions(SvcName)).
-%%% ---------------------------------------------------------------------------
-%%% # share_peer/5
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # share_peer/5
+%% ---------------------------------------------------------------------------
share_peer(up, Caps, Aliases, TPid, #state{options = [_, {_, true} | _],
service_name = Svc}) ->
@@ -2562,9 +1262,9 @@ share_peer(up, Caps, Aliases, TPid, #state{options = [_, {_, true} | _],
share_peer(_, _, _, _, _) ->
ok.
-%%% ---------------------------------------------------------------------------
-%%% # share_peers/2
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # share_peers/2
+%% ---------------------------------------------------------------------------
share_peers(Pid, #state{options = [_, {_, true} | _],
local_peers = PDict}) ->
@@ -2576,9 +1276,9 @@ share_peers(_, _) ->
sp(Pid, Alias, Peers) ->
lists:foreach(fun({P,C}) -> Pid ! {peer, P, [Alias], C} end, Peers).
-%%% ---------------------------------------------------------------------------
-%%% # remote_peer_up/4
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # remote_peer_up/4
+%% ---------------------------------------------------------------------------
remote_peer_up(Pid, Aliases, Caps, #state{options = [_, _, {_, true} | _],
service = Svc,
@@ -2598,9 +1298,9 @@ rpu(Pid, Caps, PDict, Aliases) ->
T = {Pid, Caps},
lists:foreach(fun(A) -> ?Dict:append(A, T, PDict) end, Aliases).
-%%% ---------------------------------------------------------------------------
-%%% # remote_peer_down/2
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # remote_peer_down/2
+%% ---------------------------------------------------------------------------
remote_peer_down(Pid, #state{options = [_, _, {_, true} | _],
shared_peers = PDict}) ->
@@ -2609,164 +1309,20 @@ remote_peer_down(Pid, #state{options = [_, _, {_, true} | _],
rpd(Pid, Alias, PDict) ->
?Dict:update(Alias, fun(Ps) -> lists:keydelete(Pid, 1, Ps) end, PDict).
-%%% ---------------------------------------------------------------------------
-%%% find_transport/[34]
-%%%
-%%% Return: {TransportPid, #diameter_caps{}, #diameter_app{}}
-%%% | false
-%%% | {error, Reason}
-%%% ---------------------------------------------------------------------------
-
-%% Initial call, from an arbitrary process.
-find_transport({alias, Alias}, Msg, Opts, #state{service = Svc} = S) ->
- #diameter_service{applications = Apps} = Svc,
- ft(find_send_app(Alias, Apps), Msg, Opts, S);
-
-%% Relay or proxy send.
-find_transport(#diameter_app{} = App, Msg, Opts, S) ->
- ft(App, Msg, Opts, S).
-
-ft(#diameter_app{module = Mod, dictionary = Dict} = App, Msg, Opts, S) ->
- #options{filter = Filter,
- extra = Xtra}
- = Opts,
- pick_peer(App#diameter_app{module = Mod ++ Xtra},
- get_destination(Dict, Msg),
- Filter,
- S);
-ft(false = No, _, _, _) ->
- No.
-
-%% This can't be used if we're a relay and sending a message
-%% in an application not known locally. (TODO)
-find_send_app(Alias, Apps) ->
- case lists:keyfind(Alias, #diameter_app.alias, Apps) of
- #diameter_app{id = ?APP_ID_RELAY} ->
- false;
- T ->
- T
- end.
-
-%% Retransmission, in the service process.
-find_transport([_,_] = RH,
- Req,
- #state{service = #diameter_service{pid = Pid,
- applications = Apps}}
- = S)
- when self() == Pid ->
- #request{app = Alias,
- filter = Filter,
- module = ModX}
- = Req,
- #diameter_app{}
- = App
- = lists:keyfind(Alias, #diameter_app.alias, Apps),
-
- pick_peer(App#diameter_app{module = ModX},
- RH,
- Filter,
- S).
-
-%% get_destination/2
-
-get_destination(Dict, Msg) ->
- [str(get_avp_value(Dict, 'Destination-Realm', Msg)),
- str(get_avp_value(Dict, 'Destination-Host', Msg))].
-
-%% This is not entirely correct. The avp could have an arity 1, in
-%% which case an empty list is a DiameterIdentity of length 0 rather
-%% than the list of no values we treat it as by mapping to undefined.
-%% This behaviour is documented.
-str([]) ->
- undefined;
-str(T) ->
- T.
-
-%% get_avp_value/3
-%%
-%% Find an AVP in a message of one of three forms:
-%%
-%% - a message record (as generated from a .dia spec) or
-%% - a list of an atom message name followed by 2-tuple, avp name/value pairs.
-%% - a list of a #diameter_header{} followed by #diameter_avp{} records,
-%%
-%% In the first two forms a dictionary module is used at encode to
-%% identify the type of the AVP and its arity in the message in
-%% question. The third form allows messages to be sent as is, without
-%% a dictionary, which is needed in the case of relay agents, for one.
-
-%% Messages will be header/avps list as a relay and the only AVP's we
-%% look for are in the common dictionary. This is required since the
-%% relay dictionary doesn't inherit the common dictionary (which maybe
-%% it should).
-get_avp_value(?RELAY, Name, Msg) ->
- get_avp_value(?BASE, Name, Msg);
-
-%% Message sent as a header/avps list, probably a relay case but not
-%% necessarily.
-get_avp_value(Dict, Name, [#diameter_header{} | Avps]) ->
- try
- {Code, _, VId} = Dict:avp_header(Name),
- [A|_] = lists:dropwhile(fun(#diameter_avp{code = C, vendor_id = V}) ->
- C /= Code orelse V /= VId
- end,
- Avps),
- avp_decode(Dict, Name, A)
- catch
- error: _ ->
- undefined
- end;
-
-%% Outgoing message as a name/values list.
-get_avp_value(_, Name, [_MsgName | Avps]) ->
- case lists:keyfind(Name, 1, Avps) of
- {_, V} ->
- V;
- _ ->
- undefined
- end;
-
-%% Record might be an answer message in the common dictionary.
-get_avp_value(Dict, Name, Rec)
- when Dict /= ?BASE, element(1, Rec) == 'diameter_base_answer-message' ->
- get_avp_value(?BASE, Name, Rec);
-
-%% Message is typically a record but not necessarily: diameter:call/4
-%% can be passed an arbitrary term.
-get_avp_value(Dict, Name, Rec) ->
- try
- Dict:'#get-'(Name, Rec)
- catch
- error:_ ->
- undefined
- end.
-
-avp_decode(Dict, Name, #diameter_avp{value = undefined,
- data = Bin}) ->
- Dict:avp(decode, Bin, Name);
-avp_decode(_, _, #diameter_avp{value = V}) ->
- V.
-
-%%% ---------------------------------------------------------------------------
-%%% # pick_peer(App, [DestRealm, DestHost], Filter, #state{})
-%%%
-%%% Return: {TransportPid, #diameter_caps{}, App}
-%%% | false
-%%% | {error, Reason}
-%%% ---------------------------------------------------------------------------
-
-%% Find transports to a given realm/host.
+%% ---------------------------------------------------------------------------
+%% pick_peer/4
+%% ---------------------------------------------------------------------------
pick_peer(#diameter_app{alias = Alias}
= App,
- [_,_] = RH,
+ RealmAndHost,
Filter,
#state{local_peers = L,
shared_peers = S,
service_name = SvcName,
service = #diameter_service{pid = Pid}}) ->
- pick_peer(peers(Alias, RH, Filter, L),
- peers(Alias, RH, Filter, S),
+ pick_peer(peers(Alias, RealmAndHost, Filter, L),
+ peers(Alias, RealmAndHost, Filter, S),
Pid,
SvcName,
App).
@@ -2779,7 +1335,12 @@ pick_peer([], [], _, _, _) ->
%% App state is mutable but we're not in the service process: go there.
pick_peer(Local, Remote, Pid, _SvcName, #diameter_app{mutable = true} = App)
when self() /= Pid ->
- call_service(Pid, {pick_peer, Local, Remote, App});
+ case call_service(Pid, {pick_peer, Local, Remote, App}) of
+ {TPid, _} = T when is_pid(TPid) ->
+ T;
+ {error, _} ->
+ false
+ end;
%% App state isn't mutable or it is and we're in the service process:
%% do the deed.
@@ -2787,19 +1348,18 @@ pick_peer(Local,
Remote,
_Pid,
SvcName,
- #diameter_app{module = ModX,
- alias = Alias,
+ #diameter_app{alias = Alias,
init_state = S,
mutable = M}
= App) ->
- MFA = {ModX, pick_peer, [Local, Remote, SvcName]},
+ Args = [Local, Remote, SvcName],
- try state_cb(App, MFA) of
- {ok, {TPid, #diameter_caps{} = Caps}} when is_pid(TPid) ->
- {TPid, Caps, App};
- {{TPid, #diameter_caps{} = Caps}, ModS} when is_pid(TPid), M ->
+ try state_cb(App, pick_peer, Args) of
+ {ok, {TPid, #diameter_caps{}} = T} when is_pid(TPid) ->
+ T;
+ {{TPid, #diameter_caps{}} = T, ModS} when is_pid(TPid), M ->
mod_state(Alias, ModS),
- {TPid, Caps, App};
+ T;
{false = No, ModS} when M ->
mod_state(Alias, ModS),
No;
@@ -2807,15 +1367,17 @@ pick_peer(Local,
No;
false = No ->
No;
- {{TPid, #diameter_caps{} = Caps}, S} when is_pid(TPid) ->
- {TPid, Caps, App}; %% Accept returned state in the immutable
+ {{TPid, #diameter_caps{}} = T, S} when is_pid(TPid) ->
+ T; %% Accept returned state in the immutable
{false = No, S} -> %% case as long it isn't changed.
No;
T ->
- diameter_lib:error_report({invalid, T, App}, MFA)
+ diameter_lib:error_report({invalid, T, App},
+ {App, pick_peer, Args})
catch
E: Reason ->
- diameter_lib:error_report({failure, {E, Reason, ?STACK}}, MFA)
+ diameter_lib:error_report({failure, {E, Reason, ?STACK}},
+ {App, pick_peer, Args})
end.
%% peers/4
@@ -2907,9 +1469,9 @@ transports(#state{watchdogT = WatchdogT}) ->
[{'is_pid', '$1'}],
['$1']}]).
-%%% ---------------------------------------------------------------------------
-%%% # service_info/2
-%%% ---------------------------------------------------------------------------
+%% ---------------------------------------------------------------------------
+%% # service_info/2
+%% ---------------------------------------------------------------------------
%% The config passed to diameter:start_service/2.
-define(CAP_INFO, ['Origin-Host',
@@ -3186,22 +1748,7 @@ mk_app(#diameter_app{} = A) ->
%% One entry for each outgoing request whose answer is outstanding.
info_pending(#state{} = S) ->
- MatchSpec = [{{'$1',
- #request{transport = '$2',
- from = '$3',
- app = '$4',
- _ = '_'},
- '_'},
- [?ORCOND([{'==', T, '$2'} || T <- transports(S)])],
- [{{'$1', [{{app, '$4'}},
- {{transport, '$2'}},
- {{from, '$3'}}]}}]}],
-
- try
- ets:select(?REQUEST_TABLE, MatchSpec)
- catch
- error: badarg -> [] %% service has gone down
- end.
+ diameter_traffic:pending(transports(S)).
%% info_connections/1
%%
diff --git a/lib/diameter/src/base/diameter_stats.erl b/lib/diameter/src/base/diameter_stats.erl
index 70727d068e..8fd5ded300 100644
--- a/lib/diameter/src/base/diameter_stats.erl
+++ b/lib/diameter/src/base/diameter_stats.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 2010-2012. All Rights Reserved.
+%% Copyright Ericsson AB 2010-2013. 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
@@ -136,7 +136,7 @@ read(Refs, B) ->
-spec flush([ref()])
-> [{ref(), {counter(), integer()}}].
-
+
flush(Refs) ->
try
call({flush, Refs})
diff --git a/lib/diameter/src/base/diameter_traffic.erl b/lib/diameter/src/base/diameter_traffic.erl
new file mode 100644
index 0000000000..2f486861a2
--- /dev/null
+++ b/lib/diameter/src/base/diameter_traffic.erl
@@ -0,0 +1,1633 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2013. 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%
+%%
+
+%%
+%% Implements the handling of incoming and outgoing Diameter messages
+%% except CER/CEA, DWR/DWA and DPR/DPA. That is, the messages that a
+%% diameter client sends of receives.
+%%
+
+-module(diameter_traffic).
+
+%% towards diameter
+-export([send_request/4]).
+
+%% towards diameter_watchdog
+-export([receive_message/4]).
+
+%% towards diameter_service
+-export([make_recvdata/1,
+ peer_up/1,
+ peer_down/1,
+ failover/1,
+ pending/1]).
+
+%% Other callbacks.
+-export([send/1]). %% send from remote node
+
+-include_lib("diameter/include/diameter.hrl").
+-include("diameter_internal.hrl").
+
+-define(RELAY, ?DIAMETER_DICT_RELAY).
+-define(BASE, ?DIAMETER_DICT_COMMON). %% Note: the RFC 3588 dictionary
+
+-define(DEFAULT_TIMEOUT, 5000). %% for outgoing requests
+
+%% Table containing outgoing requests for which a reply has yet to be
+%% received.
+-define(REQUEST_TABLE, diameter_request).
+
+%% Workaround for dialyzer's lack of understanding of match specs.
+-type match(T)
+ :: T | '_' | '$1' | '$2' | '$3' | '$4'.
+
+%% Record diameter:call/4 options are parsed into.
+-record(options,
+ {filter = none :: diameter:peer_filter(),
+ extra = [] :: list(),
+ timeout = ?DEFAULT_TIMEOUT :: 0..16#FFFFFFFF,
+ detach = false :: boolean()}).
+
+%% Term passed back to receive_message/4 with every incoming message.
+-record(recvdata,
+ {peerT :: ets:tid(),
+ service_name :: diameter:service_name(),
+ apps :: [#diameter_app{}],
+ sequence :: diameter:sequence()}).
+
+%% Record stored in diameter_request for each outgoing request.
+-record(request,
+ {ref :: match(reference()), %% used to receive answer
+ caller :: match(pid()), %% calling process
+ handler :: match(pid()), %% request process
+ transport :: match(pid()), %% peer process
+ caps :: match(#diameter_caps{}), %% of connection
+ packet :: match(#diameter_packet{})}). %% of request
+
+%% ---------------------------------------------------------------------------
+%% # make_recvdata/1
+%% ---------------------------------------------------------------------------
+
+make_recvdata([SvcName, PeerT, Apps, Mask | _]) ->
+ #recvdata{service_name = SvcName,
+ peerT = PeerT,
+ apps = Apps,
+ sequence = Mask}.
+%% Take a list so that the caller (diameter_service) can be upgraded
+%% first if new members are added. Note that receive_message/4 might
+%% still get an old term from any watchdog started in old code.
+
+%% ---------------------------------------------------------------------------
+%% peer_up/1
+%% ---------------------------------------------------------------------------
+
+%% Insert an element that is used to detect whether or not there has
+%% been a failover when inserting an outgoing request.
+peer_up(TPid) ->
+ ets:insert(?REQUEST_TABLE, {TPid}).
+
+%% ---------------------------------------------------------------------------
+%% peer_down/1
+%% ---------------------------------------------------------------------------
+
+peer_down(TPid) ->
+ ets:delete(?REQUEST_TABLE, TPid),
+ failover(TPid).
+
+%% ---------------------------------------------------------------------------
+%% pending/1
+%% ---------------------------------------------------------------------------
+
+pending(TPids) ->
+ MatchSpec = [{{'$1',
+ #request{caller = '$2',
+ handler = '$3',
+ transport = '$4',
+ _ = '_'},
+ '_'},
+ [?ORCOND([{'==', T, '$4'} || T <- TPids])],
+ [{{'$1', [{{caller, '$2'}},
+ {{handler, '$3'}},
+ {{transport, '$4'}}]}}]}],
+
+ try
+ ets:select(?REQUEST_TABLE, MatchSpec)
+ catch
+ error: badarg -> [] %% service has gone down
+ end.
+
+%% ---------------------------------------------------------------------------
+%% # receive_message/4
+%%
+%% Handle an incoming Diameter message.
+%% ---------------------------------------------------------------------------
+
+%% Handle an incoming Diameter message in the watchdog process. This
+%% used to come through the service process but this avoids that
+%% becoming a bottleneck.
+
+receive_message(TPid, Pkt, Dict0, RecvData)
+ when is_pid(TPid) ->
+ #diameter_packet{header = #diameter_header{is_request = R}} = Pkt,
+ recv(R,
+ (not R) andalso lookup_request(Pkt, TPid),
+ TPid,
+ Pkt,
+ Dict0,
+ RecvData).
+
+%% Incoming request ...
+recv(true, false, TPid, Pkt, Dict0, RecvData) ->
+ try
+ spawn(fun() -> recv_request(TPid, Pkt, Dict0, RecvData) end)
+ catch
+ error: system_limit = E -> %% discard
+ ?LOG({error, E}, now())
+ end;
+
+%% ... answer to known request ...
+recv(false, #request{ref = Ref, handler = Pid} = Req, _, Pkt, Dict0, _) ->
+ Pid ! {answer, Ref, Req, Dict0, Pkt};
+%% Note that failover could have happened prior to this message being
+%% received and triggering failback. That is, both a failover message
+%% and answer may be on their way to the handler process. In the worst
+%% case the request process gets notification of the failover and
+%% sends to the alternate peer before an answer arrives, so it's
+%% always the case that we can receive more than one answer after
+%% failover. The first answer received by the request process wins,
+%% any others are discarded.
+
+%% ... or not.
+recv(false, false, _, _, _, _) ->
+ ok.
+
+%% ---------------------------------------------------------------------------
+%% recv_request/4
+%% ---------------------------------------------------------------------------
+
+recv_request(TPid,
+ #diameter_packet{header = #diameter_header{application_id = Id}}
+ = Pkt,
+ Dict0,
+ #recvdata{peerT = PeerT, apps = Apps}
+ = RecvData) ->
+ recv_request(diameter_service:find_incoming_app(PeerT, TPid, Id, Apps),
+ TPid,
+ Pkt,
+ Dict0,
+ RecvData).
+
+%% recv_request/5
+
+recv_request({#diameter_app{id = Id, dictionary = Dict} = App, Caps},
+ TPid,
+ Pkt,
+ Dict0,
+ RecvData) ->
+ recv_R(App,
+ TPid,
+ Caps,
+ Dict0,
+ RecvData,
+ diameter_codec:decode(Id, Dict, Pkt));
+%% Note that the decode is different depending on whether or not Id is
+%% ?APP_ID_RELAY.
+
+%% DIAMETER_APPLICATION_UNSUPPORTED 3007
+%% A request was sent for an application that is not supported.
+
+recv_request(#diameter_caps{} = Caps, TPid, Pkt, Dict0, _) ->
+ As = collect_avps(Pkt),
+ protocol_error(3007, TPid, Caps, Dict0, Pkt#diameter_packet{avps = As});
+
+recv_request(false, _, _, _, _) -> %% transport has gone down
+ ok.
+
+collect_avps(Pkt) ->
+ case diameter_codec:collect_avps(Pkt) of
+ {_Bs, As} ->
+ As;
+ As ->
+ As
+ end.
+
+%% recv_R/6
+
+%% Wrong number of bits somewhere in the message: reply.
+%%
+%% DIAMETER_INVALID_AVP_BITS 3009
+%% A request was received that included an AVP whose flag bits are
+%% set to an unrecognized value, or that is inconsistent with the
+%% AVP's definition.
+%%
+recv_R(_App,
+ TPid,
+ Caps,
+ Dict0,
+ _RecvData,
+ #diameter_packet{errors = [Bs | _]} = Pkt)
+ when is_bitstring(Bs) ->
+ protocol_error(3009, TPid, Caps, Dict0, Pkt);
+
+%% Either we support this application but don't recognize the command
+%% or we're a relay and the command isn't proxiable.
+%%
+%% DIAMETER_COMMAND_UNSUPPORTED 3001
+%% The Request contained a Command-Code that the receiver did not
+%% recognize or support. This MUST be used when a Diameter node
+%% receives an experimental command that it does not understand.
+%%
+recv_R(#diameter_app{id = Id},
+ TPid,
+ Caps,
+ Dict0,
+ _RecvData,
+ #diameter_packet{header = #diameter_header{is_proxiable = P},
+ msg = M}
+ = Pkt)
+ when ?APP_ID_RELAY /= Id, undefined == M;
+ ?APP_ID_RELAY == Id, not P ->
+ protocol_error(3001, TPid, Caps, Dict0, Pkt);
+
+%% Error bit was set on a request.
+%%
+%% DIAMETER_INVALID_HDR_BITS 3008
+%% A request was received whose bits in the Diameter header were
+%% either set to an invalid combination, or to a value that is
+%% inconsistent with the command code's definition.
+%%
+recv_R(_App,
+ TPid,
+ Caps,
+ Dict0,
+ _RecvData,
+ #diameter_packet{header = #diameter_header{is_error = true}}
+ = Pkt) ->
+ protocol_error(3008, TPid, Caps, Dict0, Pkt);
+
+%% A message in a locally supported application or a proxiable message
+%% in the relay application. Don't distinguish between the two since
+%% each application has its own callback config. That is, the user can
+%% easily distinguish between the two cases.
+recv_R(App, TPid, Caps, Dict0, RecvData, Pkt) ->
+ request_cb(App, TPid, Caps, Dict0, RecvData, examine(Pkt)).
+
+%% Note that there may still be errors but these aren't protocol
+%% (3xxx) errors that lead to an answer-message.
+
+request_cb(App,
+ TPid,
+ Caps,
+ Dict0,
+ #recvdata{service_name = SvcName}
+ = RecvData,
+ Pkt) ->
+ request_cb(cb(App, handle_request, [Pkt, SvcName, {TPid, Caps}]),
+ App,
+ TPid,
+ Caps,
+ Dict0,
+ RecvData,
+ [],
+ Pkt).
+
+%% examine/1
+%%
+%% Look for errors in a decoded message. Length errors result in
+%% decode failure in diameter_codec.
+
+examine(#diameter_packet{header = #diameter_header{version
+ = ?DIAMETER_VERSION}}
+ = Pkt) ->
+ Pkt;
+
+%% DIAMETER_UNSUPPORTED_VERSION 5011
+%% This error is returned when a request was received, whose version
+%% number is unsupported.
+
+examine(#diameter_packet{errors = Es} = Pkt) ->
+ Pkt#diameter_packet{errors = [5011 | Es]}.
+%% It's odd/unfortunate that this isn't a protocol error.
+
+%% request_cb/8
+
+%% A reply may be an answer-message, constructed either here or by
+%% the handle_request callback. The header from the incoming request
+%% is passed into the encode so that it can retrieve the relevant
+%% command code in this case. It will also then ignore Dict and use
+%% the base encoder.
+request_cb({reply, Ans},
+ #diameter_app{dictionary = Dict},
+ TPid,
+ _Caps,
+ Dict0,
+ _RecvData,
+ Fs,
+ Pkt) ->
+ reply(Ans, dict(Dict, Dict0, Ans), TPid, Fs, Pkt);
+
+%% An 3xxx result code, for which the E-bit is set in the header.
+request_cb({protocol_error, RC},
+ _App,
+ TPid,
+ Caps,
+ Dict0,
+ _RecvData,
+ Fs,
+ Pkt)
+ when 3000 =< RC, RC < 4000 ->
+ protocol_error(RC, TPid, Caps, Dict0, Fs, Pkt);
+
+%% RFC 3588 says we must reply 3001 to anything unrecognized or
+%% unsupported. 'noreply' is undocumented (and inappropriately named)
+%% backwards compatibility for this, protocol_error the documented
+%% alternative.
+request_cb(noreply,
+ _App,
+ TPid,
+ Caps,
+ Dict0,
+ _RecvData,
+ Fs,
+ Pkt) ->
+ protocol_error(3001, TPid, Caps, Dict0, Fs, Pkt);
+
+%% Relay a request to another peer. This is equivalent to doing an
+%% explicit call/4 with the message in question except that (1) a loop
+%% will be detected by examining Route-Record AVP's, (3) a
+%% Route-Record AVP will be added to the outgoing request and (3) the
+%% End-to-End Identifier will default to that in the
+%% #diameter_header{} without the need for an end_to_end_identifier
+%% option.
+%%
+%% relay and proxy are similar in that they require the same handling
+%% with respect to Route-Record and End-to-End identifier. The
+%% difference is that a proxy advertises specific applications, while
+%% a relay advertises the relay application. If a callback doesn't
+%% want to distinguish between the cases in the callback return value
+%% then 'resend' is a neutral alternative.
+%%
+request_cb({A, Opts},
+ #diameter_app{id = Id}
+ = App,
+ TPid,
+ Caps,
+ Dict0,
+ RecvData,
+ Fs,
+ Pkt)
+ when A == relay, Id == ?APP_ID_RELAY;
+ A == proxy, Id /= ?APP_ID_RELAY;
+ A == resend ->
+ resend(Opts, App, TPid, Caps, Dict0, RecvData, Fs, Pkt);
+
+request_cb(discard, _, _, _, _, _, _, _) ->
+ ok;
+
+request_cb({eval_packet, RC, F}, App, TPid, Caps, Dict0, RecvData, Fs, Pkt) ->
+ request_cb(RC, App, TPid, Caps, Dict0, RecvData, [F|Fs], Pkt);
+
+request_cb({eval, RC, F}, App, TPid, Caps, Dict0, RecvData, Fs, Pkt) ->
+ request_cb(RC, App, TPid, Caps, Dict0, RecvData, Fs, Pkt),
+ diameter_lib:eval(F).
+
+%% dict/3
+
+%% An incoming answer, not yet decoded.
+dict(Dict, Dict0, #diameter_packet{header
+ = #diameter_header{is_request = false,
+ is_error = E},
+ msg = undefined}) ->
+ if E -> Dict0; true -> Dict end;
+
+dict(Dict, Dict0, [Msg]) ->
+ dict(Dict, Dict0, Msg);
+
+dict(Dict, Dict0, #diameter_packet{msg = Msg}) ->
+ dict(Dict, Dict0, Msg);
+
+dict(_Dict, Dict0, ['answer-message' | _]) ->
+ Dict0;
+
+dict(Dict, Dict0, Rec) ->
+ try
+ 'answer-message' = Dict0:rec2msg(element(1,Rec)),
+ Dict0
+ catch
+ error:_ -> Dict
+ end.
+
+%% protocol_error/6
+
+protocol_error(RC, TPid, Caps, Dict0, Fs, Pkt) ->
+ #diameter_caps{origin_host = {OH,_},
+ origin_realm = {OR,_}}
+ = Caps,
+ #diameter_packet{avps = Avps, errors = Es}
+ = Pkt,
+
+ ?LOG({error, RC}, Pkt),
+ reply(answer_message({OH, OR, RC}, Dict0, Avps),
+ Dict0,
+ TPid,
+ Fs,
+ Pkt#diameter_packet{errors = [RC | Es]}).
+%% Note that reply/5 may set the result code once more. It's set in
+%% answer_message/3 in case reply/5 doesn't.
+
+%% protocol_error/5
+
+protocol_error(RC, TPid, Caps, Dict0, Pkt) ->
+ protocol_error(RC, TPid, Caps, Dict0, [], Pkt).
+
+%% resend/7
+%%
+%% Resend a message as a relay or proxy agent.
+
+resend(Opts,
+ #diameter_app{}
+ = App,
+ TPid,
+ #diameter_caps{origin_host = {OH,_}}
+ = Caps,
+ Dict0,
+ RecvData,
+ Fs,
+ #diameter_packet{avps = Avps}
+ = Pkt) ->
+ {Code, _Flags, Vid} = Dict0:avp_header('Route-Record'),
+ resend(is_loop(Code, Vid, OH, Dict0, Avps),
+ Opts,
+ App,
+ TPid,
+ Caps,
+ Dict0,
+ RecvData,
+ Fs,
+ Pkt).
+
+%% DIAMETER_LOOP_DETECTED 3005
+%% An agent detected a loop while trying to get the message to the
+%% intended recipient. The message MAY be sent to an alternate peer,
+%% if one is available, but the peer reporting the error has
+%% identified a configuration problem.
+
+resend(true, _Opts, _App, TPid, Caps, Dict0, _RecvData, Fs, Pkt) ->
+ protocol_error(3005, TPid, Caps, Dict0, Fs, Pkt);
+
+%% 6.1.8. Relaying and Proxying Requests
+%%
+%% A relay or proxy agent MUST append a Route-Record AVP to all requests
+%% forwarded. The AVP contains the identity of the peer the request was
+%% received from.
+
+resend(false,
+ Opts,
+ App,
+ TPid,
+ #diameter_caps{origin_host = {_,OH}}
+ = Caps,
+ Dict0,
+ #recvdata{service_name = SvcName,
+ sequence = Mask},
+ Fs,
+ #diameter_packet{header = Hdr0,
+ avps = Avps}
+ = Pkt) ->
+ Route = #diameter_avp{data = {Dict0, 'Route-Record', OH}},
+ Seq = diameter_session:sequence(Mask),
+ Hdr = Hdr0#diameter_header{hop_by_hop_id = Seq},
+ Msg = [Hdr, Route | Avps],
+ resend(send_request(SvcName, App, Msg, Opts), TPid, Caps, Dict0, Fs, Pkt).
+%% The incoming request is relayed with the addition of a
+%% Route-Record. Note the requirement on the return from call/4 below,
+%% which places a requirement on the value returned by the
+%% handle_answer callback of the application module in question.
+%%
+%% Note that there's nothing stopping the request from being relayed
+%% back to the sender. A pick_peer callback may want to avoid this but
+%% a smart peer might recognize the potential loop and choose another
+%% route. A less smart one will probably just relay the request back
+%% again and force us to detect the loop. A pick_peer that wants to
+%% avoid this can specify filter to avoid the possibility.
+%% Eg. {neg, {host, OH} where #diameter_caps{origin_host = {OH, _}}.
+%%
+%% RFC 6.3 says that a relay agent does not modify Origin-Host but
+%% says nothing about a proxy. Assume it should behave the same way.
+
+%% resend/6
+%%
+%% Relay a reply to a relayed request.
+
+%% Answer from the peer: reset the hop by hop identifier and send.
+resend(#diameter_packet{bin = B}
+ = Pkt,
+ TPid,
+ _Caps,
+ _Dict0,
+ Fs,
+ #diameter_packet{header = #diameter_header{hop_by_hop_id = Id},
+ transport_data = TD}) ->
+ P = Pkt#diameter_packet{bin = diameter_codec:hop_by_hop_id(Id, B),
+ transport_data = TD},
+ eval_packet(P, Fs),
+ send(TPid, P);
+%% TODO: counters
+
+%% Or not: DIAMETER_UNABLE_TO_DELIVER.
+resend(_, TPid, Caps, Dict0, Fs, Pkt) ->
+ protocol_error(3002, TPid, Caps, Dict0, Fs, Pkt).
+
+%% is_loop/5
+%%
+%% Is there a Route-Record AVP with our Origin-Host?
+
+is_loop(Code,
+ Vid,
+ Bin,
+ _Dict0,
+ [#diameter_avp{code = Code, vendor_id = Vid, data = Bin} | _]) ->
+ true;
+
+is_loop(_, _, _, _, []) ->
+ false;
+
+is_loop(Code, Vid, OH, Dict0, [_ | Avps])
+ when is_binary(OH) ->
+ is_loop(Code, Vid, OH, Dict0, Avps);
+
+is_loop(Code, Vid, OH, Dict0, Avps) ->
+ is_loop(Code, Vid, Dict0:avp(encode, OH, 'Route-Record'), Dict0, Avps).
+
+%% reply/5
+%%
+%% Send a locally originating reply.
+
+%% Skip the setting of Result-Code and Failed-AVP's below. This is
+%% currently undocumented.
+reply([Msg], Dict, TPid, Fs, Pkt)
+ when is_list(Msg);
+ is_tuple(Msg) ->
+ reply(Msg, Dict, TPid, Fs, Pkt#diameter_packet{errors = []});
+
+%% No errors or a diameter_header/avp list.
+reply(Msg, Dict, TPid, Fs, #diameter_packet{errors = Es} = ReqPkt)
+ when [] == Es;
+ is_record(hd(Msg), diameter_header) ->
+ Pkt = encode(Dict, make_answer_packet(Msg, ReqPkt), Fs),
+ incr(send, Pkt, Dict, TPid), %% count result codes in sent answers
+ send(TPid, Pkt);
+
+%% Or not: set Result-Code and Failed-AVP AVP's.
+reply(Msg, Dict, TPid, Fs, #diameter_packet{errors = [H|_] = Es} = Pkt) ->
+ reply(rc(Msg, rc(H), [A || {_,A} <- Es], Dict),
+ Dict,
+ TPid,
+ Fs,
+ Pkt#diameter_packet{errors = []}).
+
+eval_packet(Pkt, Fs) ->
+ lists:foreach(fun(F) -> diameter_lib:eval([F,Pkt]) end, Fs).
+
+%% make_answer_packet/2
+
+%% A reply message clears the R and T flags and retains the P flag.
+%% The E flag will be set at encode. 6.2 of 3588 requires the same P
+%% flag on an answer as on the request. A #diameter_packet{} returned
+%% from a handle_request callback can circumvent this by setting its
+%% own header values.
+make_answer_packet(#diameter_packet{header = Hdr,
+ msg = Msg,
+ transport_data = TD},
+ #diameter_packet{header = ReqHdr}) ->
+ Hdr0 = ReqHdr#diameter_header{version = ?DIAMETER_VERSION,
+ is_request = false,
+ is_error = undefined,
+ is_retransmitted = false},
+ #diameter_packet{header = fold_record(Hdr0, Hdr),
+ msg = Msg,
+ transport_data = TD};
+
+%% Binaries and header/avp lists are sent as-is.
+make_answer_packet(Bin, #diameter_packet{transport_data = TD})
+ when is_binary(Bin) ->
+ #diameter_packet{bin = Bin,
+ transport_data = TD};
+make_answer_packet([#diameter_header{} | _] = Msg,
+ #diameter_packet{transport_data = TD}) ->
+ #diameter_packet{msg = Msg,
+ transport_data = TD};
+
+%% Otherwise, preserve transport_data.
+make_answer_packet(Msg, #diameter_packet{transport_data = TD} = Pkt) ->
+ make_answer_packet(#diameter_packet{msg = Msg, transport_data = TD}, Pkt).
+
+%% rc/1
+
+rc({RC, _}) ->
+ RC;
+rc(RC) ->
+ RC.
+
+%% rc/4
+
+rc(#diameter_packet{msg = Rec} = Pkt, RC, Failed, DictT) ->
+ Pkt#diameter_packet{msg = rc(Rec, RC, Failed, DictT)};
+
+rc(Rec, RC, Failed, DictT)
+ when is_integer(RC) ->
+ set(Rec,
+ lists:append([rc(Rec, {'Result-Code', RC}, DictT),
+ failed_avp(Rec, Failed, DictT)]),
+ DictT).
+
+%% Reply as name and tuple list ...
+set([_|_] = Ans, Avps, _) ->
+ Ans ++ Avps; %% Values nearer tail take precedence.
+
+%% ... or record.
+set(Rec, Avps, Dict) ->
+ Dict:'#set-'(Avps, Rec).
+
+%% rc/3
+%%
+%% Turn the result code into a list if its optional and only set it if
+%% the arity is 1 or {0,1}. In other cases (which probably shouldn't
+%% exist in practise) we can't know what's appropriate.
+
+rc([MsgName | _], {'Result-Code' = K, RC} = T, Dict) ->
+ case Dict:avp_arity(MsgName, 'Result-Code') of
+ 1 -> [T];
+ {0,1} -> [{K, [RC]}];
+ _ -> []
+ end;
+
+rc(Rec, T, Dict) ->
+ rc([Dict:rec2msg(element(1, Rec))], T, Dict).
+
+%% failed_avp/3
+
+failed_avp(_, [] = No, _) ->
+ No;
+
+failed_avp(Rec, Failed, Dict) ->
+ [fa(Rec, [{'AVP', Failed}], Dict)].
+
+%% Reply as name and tuple list ...
+fa([MsgName | Values], FailedAvp, Dict) ->
+ R = Dict:msg2rec(MsgName),
+ try
+ Dict:'#info-'(R, {index, 'Failed-AVP'}),
+ {'Failed-AVP', [FailedAvp]}
+ catch
+ error: _ ->
+ Avps = proplists:get_value('AVP', Values, []),
+ A = #diameter_avp{name = 'Failed-AVP',
+ value = FailedAvp},
+ {'AVP', [A|Avps]}
+ end;
+
+%% ... or record.
+fa(Rec, FailedAvp, Dict) ->
+ try
+ {'Failed-AVP', [FailedAvp]}
+ catch
+ error: _ ->
+ Avps = Dict:'get-'('AVP', Rec),
+ A = #diameter_avp{name = 'Failed-AVP',
+ value = FailedAvp},
+ {'AVP', [A|Avps]}
+ end.
+
+%% 3. Diameter Header
+%%
+%% E(rror) - If set, the message contains a protocol error,
+%% and the message will not conform to the ABNF
+%% described for this command. Messages with the 'E'
+%% bit set are commonly referred to as error
+%% messages. This bit MUST NOT be set in request
+%% messages. See Section 7.2.
+
+%% 3.2. Command Code ABNF specification
+%%
+%% e-bit = ", ERR"
+%% ; If present, the 'E' bit in the Command
+%% ; Flags is set, indicating that the answer
+%% ; message contains a Result-Code AVP in
+%% ; the "protocol error" class.
+
+%% 7.1.3. Protocol Errors
+%%
+%% Errors that fall within the Protocol Error category SHOULD be treated
+%% on a per-hop basis, and Diameter proxies MAY attempt to correct the
+%% error, if it is possible. Note that these and only these errors MUST
+%% only be used in answer messages whose 'E' bit is set.
+
+%% Thus, only construct answers to protocol errors. Other errors
+%% require an message-specific answer and must be handled by the
+%% application.
+
+%% 6.2. Diameter Answer Processing
+%%
+%% When a request is locally processed, the following procedures MUST be
+%% applied to create the associated answer, in addition to any
+%% additional procedures that MAY be discussed in the Diameter
+%% application defining the command:
+%%
+%% - The same Hop-by-Hop identifier in the request is used in the
+%% answer.
+%%
+%% - The local host's identity is encoded in the Origin-Host AVP.
+%%
+%% - The Destination-Host and Destination-Realm AVPs MUST NOT be
+%% present in the answer message.
+%%
+%% - The Result-Code AVP is added with its value indicating success or
+%% failure.
+%%
+%% - If the Session-Id is present in the request, it MUST be included
+%% in the answer.
+%%
+%% - Any Proxy-Info AVPs in the request MUST be added to the answer
+%% message, in the same order they were present in the request.
+%%
+%% - The 'P' bit is set to the same value as the one in the request.
+%%
+%% - The same End-to-End identifier in the request is used in the
+%% answer.
+%%
+%% Note that the error messages (see Section 7.3) are also subjected to
+%% the above processing rules.
+
+%% 7.3. Error-Message AVP
+%%
+%% The Error-Message AVP (AVP Code 281) is of type UTF8String. It MAY
+%% accompany a Result-Code AVP as a human readable error message. The
+%% Error-Message AVP is not intended to be useful in real-time, and
+%% SHOULD NOT be expected to be parsed by network entities.
+
+%% answer_message/3
+
+answer_message({OH, OR, RC}, Dict0, Avps) ->
+ {Code, _, Vid} = Dict0:avp_header('Session-Id'),
+ ['answer-message', {'Origin-Host', OH},
+ {'Origin-Realm', OR},
+ {'Result-Code', RC}
+ | session_id(Code, Vid, Dict0, Avps)].
+
+session_id(Code, Vid, Dict0, Avps)
+ when is_list(Avps) ->
+ try
+ {value, #diameter_avp{data = D}} = find_avp(Code, Vid, Avps),
+ [{'Session-Id', [Dict0:avp(decode, D, 'Session-Id')]}]
+ catch
+ error: _ ->
+ []
+ end.
+
+%% find_avp/3
+
+find_avp(Code, Vid, Avps)
+ when is_integer(Code), (undefined == Vid orelse is_integer(Vid)) ->
+ find(fun(A) -> is_avp(Code, Vid, A) end, Avps).
+
+%% The final argument here could be a list of AVP's, depending on the case,
+%% but we're only searching at the top level.
+is_avp(Code, Vid, #diameter_avp{code = Code, vendor_id = Vid}) ->
+ true;
+is_avp(_, _, _) ->
+ false.
+
+find(_, []) ->
+ false;
+find(Pred, [H|T]) ->
+ case Pred(H) of
+ true ->
+ {value, H};
+ false ->
+ find(Pred, T)
+ end.
+
+%% 7. Error Handling
+%%
+%% There are certain Result-Code AVP application errors that require
+%% additional AVPs to be present in the answer. In these cases, the
+%% Diameter node that sets the Result-Code AVP to indicate the error
+%% MUST add the AVPs. Examples are:
+%%
+%% - An unrecognized AVP is received with the 'M' bit (Mandatory bit)
+%% set, causes an answer to be sent with the Result-Code AVP set to
+%% DIAMETER_AVP_UNSUPPORTED, and the Failed-AVP AVP containing the
+%% offending AVP.
+%%
+%% - An AVP that is received with an unrecognized value causes an
+%% answer to be returned with the Result-Code AVP set to
+%% DIAMETER_INVALID_AVP_VALUE, with the Failed-AVP AVP containing the
+%% AVP causing the error.
+%%
+%% - A command is received with an AVP that is omitted, yet is
+%% mandatory according to the command's ABNF. The receiver issues an
+%% answer with the Result-Code set to DIAMETER_MISSING_AVP, and
+%% creates an AVP with the AVP Code and other fields set as expected
+%% in the missing AVP. The created AVP is then added to the Failed-
+%% AVP AVP.
+%%
+%% The Result-Code AVP describes the error that the Diameter node
+%% encountered in its processing. In case there are multiple errors,
+%% the Diameter node MUST report only the first error it encountered
+%% (detected possibly in some implementation dependent order). The
+%% specific errors that can be described by this AVP are described in
+%% the following section.
+
+%% 7.5. Failed-AVP AVP
+%%
+%% The Failed-AVP AVP (AVP Code 279) is of type Grouped and provides
+%% debugging information in cases where a request is rejected or not
+%% fully processed due to erroneous information in a specific AVP. The
+%% value of the Result-Code AVP will provide information on the reason
+%% for the Failed-AVP AVP.
+%%
+%% The possible reasons for this AVP are the presence of an improperly
+%% constructed AVP, an unsupported or unrecognized AVP, an invalid AVP
+%% value, the omission of a required AVP, the presence of an explicitly
+%% excluded AVP (see tables in Section 10), or the presence of two or
+%% more occurrences of an AVP which is restricted to 0, 1, or 0-1
+%% occurrences.
+%%
+%% A Diameter message MAY contain one Failed-AVP AVP, containing the
+%% entire AVP that could not be processed successfully. If the failure
+%% reason is omission of a required AVP, an AVP with the missing AVP
+%% code, the missing vendor id, and a zero filled payload of the minimum
+%% required length for the omitted AVP will be added.
+
+%% incr/4
+%%
+%% Increment a stats counter for an incoming or outgoing message.
+
+%% Outgoing message as binary: don't count. (Sending binaries is only
+%% partially supported.)
+incr(_, #diameter_packet{msg = undefined}, _, _) ->
+ ok;
+
+incr(recv = D, #diameter_packet{header = H, errors = [_|_]}, _, TPid) ->
+ incr(TPid, {diameter_codec:msg_id(H), D, error});
+
+incr(Dir, Pkt, Dict, TPid) ->
+ #diameter_packet{header = #diameter_header{is_error = E}
+ = Hdr,
+ msg = Rec}
+ = Pkt,
+
+ RC = int(get_avp_value(Dict, 'Result-Code', Rec)),
+ PE = is_protocol_error(RC),
+
+ %% Check that the E bit is set only for 3xxx result codes.
+ (not (E orelse PE))
+ orelse (E andalso PE)
+ orelse x({invalid_error_bit, RC}, answer, [Dir, Pkt]),
+
+ irc(TPid, Hdr, Dir, rc_counter(Dict, Rec, RC)).
+
+irc(_, _, _, undefined) ->
+ false;
+
+irc(TPid, Hdr, Dir, Ctr) ->
+ incr(TPid, {diameter_codec:msg_id(Hdr), Dir, Ctr}).
+
+%% incr/2
+
+incr(TPid, Counter) ->
+ diameter_stats:incr(Counter, TPid, 1).
+
+%% error_counter/2
+
+%% RFC 3588, 7.6:
+%%
+%% All Diameter answer messages defined in vendor-specific
+%% applications MUST include either one Result-Code AVP or one
+%% Experimental-Result AVP.
+%%
+%% Maintain statistics assuming one or the other, not both, which is
+%% surely the intent of the RFC.
+
+rc_counter(Dict, Rec, undefined) ->
+ rcc(get_avp_value(Dict, 'Experimental-Result', Rec));
+rc_counter(_, _, RC) ->
+ {'Result-Code', RC}.
+
+%% Outgoing answers may be in any of the forms messages can be sent
+%% in. Incoming messages will be records. We're assuming here that the
+%% arity of the result code AVP's is 0 or 1.
+
+rcc([{_,_,N} = T | _])
+ when is_integer(N) ->
+ T;
+rcc({_,_,N} = T)
+ when is_integer(N) ->
+ T;
+rcc(_) ->
+ undefined.
+
+%% Extract the first good looking integer. There's no guarantee
+%% that what we're looking for has arity 1.
+int([N|_])
+ when is_integer(N) ->
+ N;
+int(N)
+ when is_integer(N) ->
+ N;
+int(_) ->
+ undefined.
+
+is_protocol_error(RC) ->
+ 3000 =< RC andalso RC < 4000.
+
+-spec x(any(), atom(), list()) -> no_return().
+
+%% Warn and exit request process on errors in an incoming answer.
+x(Reason, F, A) ->
+ diameter_lib:warning_report(Reason, {?MODULE, F, A}),
+ x(Reason).
+
+x(T) ->
+ exit(T).
+
+%% ---------------------------------------------------------------------------
+%% # send_request/4
+%%
+%% Handle an outgoing Diameter request.
+%% ---------------------------------------------------------------------------
+
+send_request(SvcName, AppOrAlias, Msg, Options)
+ when is_list(Options) ->
+ Rec = make_options(Options),
+ Ref = make_ref(),
+ Caller = {self(), Ref},
+ ReqF = fun() ->
+ exit({Ref, send_R(SvcName, AppOrAlias, Msg, Rec, Caller)})
+ end,
+ try spawn_monitor(ReqF) of
+ {_, MRef} ->
+ recv_A(MRef, Ref, Rec#options.detach, false)
+ catch
+ error: system_limit = E ->
+ {error, E}
+ end.
+%% The R in send_R is because Diameter request are usually given short
+%% names of the form XXR. (eg. CER, DWR, etc.) Similarly, answers have
+%% names of the form XXA.
+
+%% Don't rely on gen_server:call/3 for the timeout handling since it
+%% makes no guarantees about not leaving a reply message in the
+%% mailbox if we catch its exit at timeout. It currently *can* do so,
+%% which is also undocumented.
+
+recv_A(MRef, _, true, true) ->
+ erlang:demonitor(MRef, [flush]),
+ ok;
+
+recv_A(MRef, Ref, Detach, Sent) ->
+ receive
+ Ref -> %% send has been attempted
+ recv_A(MRef, Ref, Detach, true);
+ {'DOWN', MRef, process, _, Reason} ->
+ answer_rc(Reason, Ref, Sent)
+ end.
+
+%% send_R/5 has returned ...
+answer_rc({Ref, Ans}, Ref, _) ->
+ Ans;
+
+%% ... or not. Note that failure/encode are documented return values.
+answer_rc(_, _, Sent) ->
+ {error, choose(Sent, failure, encode)}.
+
+%% send_R/5
+%%
+%% In the process spawned for the outgoing request.
+
+send_R(SvcName, AppOrAlias, Msg, Opts, Caller) ->
+ case pick_peer(SvcName, AppOrAlias, Msg, Opts) of
+ {{_,_,_} = Transport, Mask} ->
+ send_request(Transport, Mask, Msg, Opts, Caller, SvcName);
+ false ->
+ {error, no_connection};
+ {error, _} = No ->
+ No
+ end.
+
+%% make_options/1
+
+make_options(Options) ->
+ lists:foldl(fun mo/2, #options{}, Options).
+
+mo({timeout, T}, Rec)
+ when is_integer(T), 0 =< T ->
+ Rec#options{timeout = T};
+
+mo({filter, F}, #options{filter = none} = Rec) ->
+ Rec#options{filter = F};
+mo({filter, F}, #options{filter = {all, Fs}} = Rec) ->
+ Rec#options{filter = {all, [F | Fs]}};
+mo({filter, F}, #options{filter = F0} = Rec) ->
+ Rec#options{filter = {all, [F0, F]}};
+
+mo({extra, L}, #options{extra = X} = Rec)
+ when is_list(L) ->
+ Rec#options{extra = X ++ L};
+
+mo(detach, Rec) ->
+ Rec#options{detach = true};
+
+mo(T, _) ->
+ ?ERROR({invalid_option, T}).
+
+%% ---------------------------------------------------------------------------
+%% # send_request/6
+%% ---------------------------------------------------------------------------
+
+%% Send an outgoing request in its dedicated process.
+%%
+%% Note that both encode of the outgoing request and of the received
+%% answer happens in this process. It's also this process that replies
+%% to the caller. The service process only handles the state-retaining
+%% callbacks.
+%%
+%% The module field of the #diameter_app{} here includes any extra
+%% arguments passed to diameter:call/4.
+
+send_request({TPid, Caps, App}
+ = Transport,
+ Mask,
+ Msg,
+ Opts,
+ Caller,
+ SvcName) ->
+ Pkt = make_prepare_packet(Mask, Msg),
+
+ send_R(cb(App, prepare_request, [Pkt, SvcName, {TPid, Caps}]),
+ Pkt,
+ Transport,
+ Opts,
+ Caller,
+ SvcName,
+ []).
+
+send_R({send, Msg}, Pkt, Transport, Opts, Caller, SvcName, Fs) ->
+ send_R(make_request_packet(Msg, Pkt),
+ Transport,
+ Opts,
+ Caller,
+ SvcName,
+ Fs);
+
+send_R({discard, Reason} , _, _, _, _, _, _) ->
+ {error, Reason};
+
+send_R(discard, _, _, _, _, _, _) ->
+ {error, discarded};
+
+send_R({eval_packet, RC, F}, Pkt, T, Opts, Caller, SvcName, Fs) ->
+ send_R(RC, Pkt, T, Opts, Caller, SvcName, [F|Fs]);
+
+send_R(E, _, {_, _, App}, _, _, _, _) ->
+ ?ERROR({invalid_return, prepare_request, App, E}).
+
+%% make_prepare_packet/2
+%%
+%% Turn an outgoing request as passed to call/4 into a diameter_packet
+%% record in preparation for a prepare_request callback.
+
+make_prepare_packet(_, Bin)
+ when is_binary(Bin) ->
+ #diameter_packet{header = diameter_codec:decode_header(Bin),
+ bin = Bin};
+
+make_prepare_packet(Mask, #diameter_packet{msg = [#diameter_header{} = Hdr
+ | Avps]}
+ = Pkt) ->
+ Pkt#diameter_packet{msg = [make_prepare_header(Mask, Hdr) | Avps]};
+
+make_prepare_packet(Mask, #diameter_packet{header = Hdr} = Pkt) ->
+ Pkt#diameter_packet{header = make_prepare_header(Mask, Hdr)};
+
+make_prepare_packet(Mask, Msg) ->
+ make_prepare_packet(Mask, #diameter_packet{msg = Msg}).
+
+%% make_prepare_header/2
+
+make_prepare_header(Mask, undefined) ->
+ Seq = diameter_session:sequence(Mask),
+ make_prepare_header(#diameter_header{end_to_end_id = Seq,
+ hop_by_hop_id = Seq});
+
+make_prepare_header(Mask, #diameter_header{end_to_end_id = undefined,
+ hop_by_hop_id = undefined}
+ = H) ->
+ Seq = diameter_session:sequence(Mask),
+ make_prepare_header(H#diameter_header{end_to_end_id = Seq,
+ hop_by_hop_id = Seq});
+
+make_prepare_header(Mask, #diameter_header{end_to_end_id = undefined} = H) ->
+ Seq = diameter_session:sequence(Mask),
+ make_prepare_header(H#diameter_header{end_to_end_id = Seq});
+
+make_prepare_header(Mask, #diameter_header{hop_by_hop_id = undefined} = H) ->
+ Seq = diameter_session:sequence(Mask),
+ make_prepare_header(H#diameter_header{hop_by_hop_id = Seq});
+
+make_prepare_header(_, Hdr) ->
+ make_prepare_header(Hdr).
+
+%% make_prepare_header/1
+
+make_prepare_header(#diameter_header{version = undefined} = Hdr) ->
+ make_prepare_header(Hdr#diameter_header{version = ?DIAMETER_VERSION});
+
+make_prepare_header(#diameter_header{} = Hdr) ->
+ Hdr;
+
+make_prepare_header(T) ->
+ ?ERROR({invalid_header, T}).
+
+%% make_request_packet/2
+%%
+%% Reconstruct a diameter_packet from the return value of
+%% prepare_request or prepare_retransmit callback.
+
+make_request_packet(Bin, _)
+ when is_binary(Bin) ->
+ make_prepare_packet(false, Bin);
+
+make_request_packet(#diameter_packet{msg = [#diameter_header{} | _]}
+ = Pkt,
+ _) ->
+ Pkt;
+
+%% Returning a diameter_packet with no header from a prepare_request
+%% or prepare_retransmit callback retains the header passed into it.
+%% This is primarily so that the end to end and hop by hop identifiers
+%% are retained.
+make_request_packet(#diameter_packet{header = Hdr} = Pkt,
+ #diameter_packet{header = Hdr0}) ->
+ Pkt#diameter_packet{header = fold_record(Hdr0, Hdr)};
+
+make_request_packet(Msg, Pkt) ->
+ Pkt#diameter_packet{msg = Msg}.
+
+%% fold_record/2
+
+fold_record(undefined, R) ->
+ R;
+fold_record(Rec, R) ->
+ diameter_lib:fold_tuple(2, Rec, R).
+
+%% send_R/6
+
+send_R(Pkt0,
+ {TPid, Caps, #diameter_app{dictionary = Dict} = App},
+ Opts,
+ {Pid, Ref},
+ SvcName,
+ Fs) ->
+ Pkt = encode(Dict, Pkt0, Fs),
+
+ #options{timeout = Timeout}
+ = Opts,
+
+ Req = #request{ref = Ref,
+ caller = Pid,
+ handler = self(),
+ transport = TPid,
+ caps = Caps,
+ packet = Pkt0},
+
+ try
+ TRef = send_request(TPid, Pkt, Req, SvcName, Timeout),
+ Pid ! Ref, %% tell caller a send has been attempted
+ handle_answer(SvcName,
+ App,
+ recv_A(Timeout, SvcName, App, Opts, {TRef, Req}))
+ after
+ erase_requests(Pkt)
+ end.
+
+%% recv_A/5
+
+recv_A(Timeout, SvcName, App, Opts, {TRef, #request{ref = Ref} = Req}) ->
+ %% Matching on TRef below ensures we ignore messages that pertain
+ %% to a previous transport prior to failover. The answer message
+ %% includes the #request{} since it's not necessarily Req; that
+ %% is, from the last peer to which we've transmitted.
+ receive
+ {answer = A, Ref, Rq, Dict0, Pkt} -> %% Answer from peer
+ {A, Rq, Dict0, Pkt};
+ {timeout = Reason, TRef, _} -> %% No timely reply
+ {error, Req, Reason};
+ {failover, TRef} -> %% Service says peer has gone down
+ retransmit(pick_peer(SvcName, App, Req, Opts),
+ Req,
+ Opts,
+ SvcName,
+ Timeout)
+ end.
+
+%% handle_answer/3
+
+handle_answer(SvcName, App, {error, Req, Reason}) ->
+ handle_error(App, Req, Reason, SvcName);
+
+handle_answer(SvcName,
+ #diameter_app{dictionary = Dict}
+ = App,
+ {answer, Req, Dict0, Pkt}) ->
+ Mod = dict(Dict, Dict0, Pkt),
+ answer(examine(diameter_codec:decode(Mod, Pkt)),
+ SvcName,
+ Mod,
+ App,
+ Req).
+
+%% We don't really need to do a full decode if we're a relay and will
+%% just resend with a new hop by hop identifier, but might a proxy
+%% want to examine the answer?
+
+answer(Pkt, SvcName, Dict, App, #request{transport = TPid} = Req) ->
+ try
+ incr(recv, Pkt, Dict, TPid)
+ of
+ _ -> answer(Pkt, SvcName, App, Req)
+ catch
+ exit: {invalid_error_bit, _} = E ->
+ answer(Pkt#diameter_packet{errors = [E]}, SvcName, App, Req)
+ end.
+
+answer(Pkt,
+ SvcName,
+ #diameter_app{module = ModX,
+ options = [{answer_errors, AE} | _]},
+ Req) ->
+ a(Pkt, SvcName, ModX, AE, Req).
+
+a(#diameter_packet{errors = Es}
+ = Pkt,
+ SvcName,
+ ModX,
+ AE,
+ #request{transport = TPid,
+ caps = Caps,
+ packet = P})
+ when [] == Es;
+ callback == AE ->
+ cb(ModX, handle_answer, [Pkt, msg(P), SvcName, {TPid, Caps}]);
+
+a(Pkt, SvcName, _, report, Req) ->
+ x(errors, handle_answer, [SvcName, Req, Pkt]);
+
+a(Pkt, SvcName, _, discard, Req) ->
+ x({errors, handle_answer, [SvcName, Req, Pkt]}).
+
+%% Note that we don't check that the application id in the answer's
+%% header is what we expect. (TODO: Does the rfc says anything about
+%% this?)
+
+%% Note that failover starts a new timer and that expiry of an old
+%% timer value is ignored. This means that an answer could be accepted
+%% from a peer after timeout in the case of failover.
+
+retransmit({{_,_,App} = Transport, _Mask}, Req, Opts, SvcName, Timeout) ->
+ try retransmit(Transport, Req, SvcName, Timeout) of
+ T -> recv_A(Timeout, SvcName, App, Opts, T)
+ catch
+ ?FAILURE(Reason) -> {error, Req, Reason}
+ end;
+
+retransmit(_, Req, _, _, _) -> %% no alternate peer
+ {error, Req, failover}.
+
+%% pick_peer/4
+
+%% Retransmission after failover: call-specific arguments have already
+%% been appended in App.
+pick_peer(SvcName,
+ App,
+ #request{packet = #diameter_packet{msg = Msg}},
+ Opts) ->
+ pick_peer(SvcName, App, Msg, Opts#options{extra = []});
+
+pick_peer(_, _, undefined, _) ->
+ false;
+
+pick_peer(SvcName,
+ AppOrAlias,
+ Msg,
+ #options{filter = Filter, extra = Xtra}) ->
+ diameter_service:pick_peer(SvcName,
+ AppOrAlias,
+ {fun(D) -> get_destination(D, Msg) end,
+ Filter,
+ Xtra}).
+
+%% handle_error/4
+
+handle_error(App,
+ #request{packet = Pkt,
+ transport = TPid,
+ caps = Caps},
+ Reason,
+ SvcName) ->
+ cb(App, handle_error, [Reason, msg(Pkt), SvcName, {TPid, Caps}]).
+
+msg(#diameter_packet{msg = undefined, bin = Bin}) ->
+ Bin;
+msg(#diameter_packet{msg = Msg}) ->
+ Msg.
+
+%% encode/3
+
+encode(Dict, Pkt, Fs) ->
+ P = encode(Dict, Pkt),
+ eval_packet(P, Fs),
+ P.
+
+%% encode/2
+
+%% Note that prepare_request can return a diameter_packet containing a
+%% header or transport_data. Even allow the returned record to contain
+%% an encoded binary. This isn't the usual case and doesn't properly
+%% support retransmission but is useful for test.
+
+%% A message to be encoded.
+encode(Dict, #diameter_packet{bin = undefined} = Pkt) ->
+ diameter_codec:encode(Dict, Pkt);
+
+%% An encoded binary: just send.
+encode(_, #diameter_packet{} = Pkt) ->
+ Pkt.
+
+%% send_request/5
+
+send_request(TPid, #diameter_packet{bin = Bin} = Pkt, Req, _SvcName, Timeout)
+ when node() == node(TPid) ->
+ %% Store the outgoing request before sending to avoid a race with
+ %% reply reception.
+ TRef = store_request(TPid, Bin, Req, Timeout),
+ send(TPid, Pkt),
+ TRef;
+
+%% Send using a remote transport: spawn a process on the remote node
+%% to relay the answer.
+send_request(TPid, #diameter_packet{} = Pkt, Req, SvcName, Timeout) ->
+ TRef = erlang:start_timer(Timeout, self(), TPid),
+ T = {TPid, Pkt, Req, SvcName, Timeout, TRef},
+ spawn(node(TPid), ?MODULE, send, [T]),
+ TRef.
+
+%% send/1
+
+send({TPid, Pkt, #request{handler = Pid} = Req, SvcName, Timeout, TRef}) ->
+ Ref = send_request(TPid,
+ Pkt,
+ Req#request{handler = self()},
+ SvcName,
+ Timeout),
+ Pid ! reref(receive T -> T end, Ref, TRef).
+
+reref({T, Ref, R}, Ref, TRef) ->
+ {T, TRef, R};
+reref(T, _, _) ->
+ T.
+
+%% send/2
+
+send(Pid, Pkt) ->
+ Pid ! {send, Pkt}.
+
+%% retransmit/4
+
+retransmit({TPid, Caps, App}
+ = Transport,
+ #request{packet = Pkt0}
+ = Req,
+ SvcName,
+ Timeout) ->
+ have_request(Pkt0, TPid) %% Don't failover to a peer we've
+ andalso ?THROW(timeout), %% already sent to.
+
+ #diameter_packet{header = Hdr0} = Pkt0,
+ Hdr = Hdr0#diameter_header{is_retransmitted = true},
+ Pkt = Pkt0#diameter_packet{header = Hdr},
+
+ retransmit(cb(App, prepare_retransmit, [Pkt, SvcName, {TPid, Caps}]),
+ Transport,
+ Req#request{packet = Pkt},
+ SvcName,
+ Timeout,
+ []).
+
+retransmit({send, Msg},
+ Transport,
+ #request{packet = Pkt}
+ = Req,
+ SvcName,
+ Timeout,
+ Fs) ->
+ resend_request(make_request_packet(Msg, Pkt),
+ Transport,
+ Req,
+ SvcName,
+ Timeout,
+ Fs);
+
+retransmit({discard, Reason}, _, _, _, _, _) ->
+ ?THROW(Reason);
+
+retransmit(discard, _, _, _, _, _) ->
+ ?THROW(discarded);
+
+retransmit({eval_packet, RC, F}, Transport, Req, SvcName, Timeout, Fs) ->
+ retransmit(RC, Transport, Req, SvcName, Timeout, [F|Fs]);
+
+retransmit(T, {_, _, App}, _, _, _, _) ->
+ ?ERROR({invalid_return, prepare_retransmit, App, T}).
+
+resend_request(Pkt0,
+ {TPid, Caps, #diameter_app{dictionary = Dict}},
+ Req0,
+ SvcName,
+ Tmo,
+ Fs) ->
+ Pkt = encode(Dict, Pkt0, Fs),
+
+ Req = Req0#request{transport = TPid,
+ packet = Pkt0,
+ caps = Caps},
+
+ ?LOG(retransmission, Req),
+ TRef = send_request(TPid, Pkt, Req, SvcName, Tmo),
+ {TRef, Req}.
+
+%% store_request/4
+
+store_request(TPid, Bin, Req, Timeout) ->
+ Seqs = diameter_codec:sequence_numbers(Bin),
+ TRef = erlang:start_timer(Timeout, self(), timeout),
+ ets:insert(?REQUEST_TABLE, {Seqs, Req, TRef}),
+ ets:member(?REQUEST_TABLE, TPid)
+ orelse (self() ! {failover, TRef}), %% failover/1 may have missed
+ TRef.
+
+%% lookup_request/2
+
+lookup_request(Msg, TPid) ->
+ Seqs = diameter_codec:sequence_numbers(Msg),
+ Spec = [{{Seqs, #request{transport = TPid, _ = '_'}, '_'},
+ [],
+ ['$_']}],
+ case ets:select(?REQUEST_TABLE, Spec) of
+ [{_, Req, _}] ->
+ Req;
+ [] ->
+ false
+ end.
+
+%% erase_requests/1
+
+erase_requests(Pkt) ->
+ ets:delete(?REQUEST_TABLE, diameter_codec:sequence_numbers(Pkt)).
+
+%% match_requests/1
+
+match_requests(TPid) ->
+ Pat = {'_', #request{transport = TPid, _ = '_'}, '_'},
+ ets:select(?REQUEST_TABLE, [{Pat, [], ['$_']}]).
+
+%% have_request/2
+
+have_request(Pkt, TPid) ->
+ Seqs = diameter_codec:sequence_numbers(Pkt),
+ Pat = {Seqs, #request{transport = TPid, _ = '_'}, '_'},
+ '$end_of_table' /= ets:select(?REQUEST_TABLE, [{Pat, [], ['$_']}], 1).
+
+%% ---------------------------------------------------------------------------
+%% # failover/1-2
+%% ---------------------------------------------------------------------------
+
+failover(TPid)
+ when is_pid(TPid) ->
+ lists:foreach(fun failover/1, match_requests(TPid));
+%% Note that a request process can store its request after failover
+%% notifications are sent here: store_request/4 sends the notification
+%% in that case.
+
+%% Failover as a consequence of request_peer_down/1: inform the
+%% request process.
+failover({_, Req, TRef}) ->
+ #request{handler = Pid,
+ packet = #diameter_packet{msg = M}}
+ = Req,
+ M /= undefined andalso (Pid ! {failover, TRef}).
+%% Failover is not performed when msg = binary() since sending
+%% pre-encoded binaries is only partially supported. (Mostly for
+%% test.)
+
+%% get_destination/2
+
+get_destination(Dict, Msg) ->
+ [str(get_avp_value(Dict, D, Msg)) || D <- ['Destination-Realm',
+ 'Destination-Host']].
+
+%% This is not entirely correct. The avp could have an arity 1, in
+%% which case an empty list is a DiameterIdentity of length 0 rather
+%% than the list of no values we treat it as by mapping to undefined.
+%% This behaviour is documented.
+str([]) ->
+ undefined;
+str(T) ->
+ T.
+
+%% get_avp_value/3
+%%
+%% Find an AVP in a message of one of three forms:
+%%
+%% - a message record (as generated from a .dia spec) or
+%% - a list of an atom message name followed by 2-tuple, avp name/value pairs.
+%% - a list of a #diameter_header{} followed by #diameter_avp{} records,
+%%
+%% In the first two forms a dictionary module is used at encode to
+%% identify the type of the AVP and its arity in the message in
+%% question. The third form allows messages to be sent as is, without
+%% a dictionary, which is needed in the case of relay agents, for one.
+
+%% Messages will be header/avps list as a relay and the only AVP's we
+%% look for are in the common dictionary. This is required since the
+%% relay dictionary doesn't inherit the common dictionary (which maybe
+%% it should).
+get_avp_value(?RELAY, Name, Msg) ->
+ get_avp_value(?BASE, Name, Msg);
+
+%% Message sent as a header/avps list, probably a relay case but not
+%% necessarily.
+get_avp_value(Dict, Name, [#diameter_header{} | Avps]) ->
+ try
+ {Code, _, VId} = Dict:avp_header(Name),
+ [A|_] = lists:dropwhile(fun(#diameter_avp{code = C, vendor_id = V}) ->
+ C /= Code orelse V /= VId
+ end,
+ Avps),
+ avp_decode(Dict, Name, A)
+ catch
+ error: _ ->
+ undefined
+ end;
+
+%% Outgoing message as a name/values list.
+get_avp_value(_, Name, [_MsgName | Avps]) ->
+ case lists:keyfind(Name, 1, Avps) of
+ {_, V} ->
+ V;
+ _ ->
+ undefined
+ end;
+
+%% Message is typically a record but not necessarily.
+get_avp_value(Dict, Name, Rec) ->
+ try
+ Dict:'#get-'(Name, Rec)
+ catch
+ error:_ ->
+ undefined
+ end.
+
+avp_decode(Dict, Name, #diameter_avp{value = undefined,
+ data = Bin}) ->
+ Dict:avp(decode, Bin, Name);
+avp_decode(_, _, #diameter_avp{value = V}) ->
+ V.
+
+cb(#diameter_app{module = [_|_] = M}, F, A) ->
+ eval(M, F, A);
+cb([_|_] = M, F, A) ->
+ eval(M, F, A).
+
+eval([M|X], F, A) ->
+ apply(M, F, A ++ X).
+
+choose(true, X, _) -> X;
+choose(false, _, X) -> X.
diff --git a/lib/diameter/src/base/diameter_watchdog.erl b/lib/diameter/src/base/diameter_watchdog.erl
index 10ab246b88..073a415d10 100644
--- a/lib/diameter/src/base/diameter_watchdog.erl
+++ b/lib/diameter/src/base/diameter_watchdog.erl
@@ -45,6 +45,8 @@
-define(DEFAULT_TW_INIT, 30000). %% RFC 3539 ch 3.4.1
-define(NOMASK, {0,32}). %% default sequence mask
+-define(BASE, ?DIAMETER_DICT_COMMON).
+
-record(watchdog,
{%% PCB - Peer Control Block; see RFC 3539, Appendix A
status = initial :: initial | okay | suspect | down | reopen,
@@ -56,8 +58,10 @@
%% end PCB
parent = self() :: pid(), %% service process
transport :: pid() | undefined, %% peer_fsm process
- tref :: reference(), %% reference for current watchdog timer
- message_data, %% term passed into diameter_service with message
+ tref :: reference(), %% reference for current watchdog timer
+ dictionary :: module(), %% common dictionary
+ receive_data :: term(),
+ %% term passed into diameter_service with incoming message
sequence :: diameter:sequence(), %% mask
restrict :: {diameter:restriction(), boolean()},
shutdown = false :: boolean()}).
@@ -70,13 +74,12 @@
%% reason.
%% ---------------------------------------------------------------------------
--spec start(Type, {RecvData, [Opt], SvcName, SvcOpts, #diameter_service{}})
+-spec start(Type, {RecvData, [Opt], SvcOpts, #diameter_service{}})
-> {reference(), pid()}
when Type :: {connect|accept, diameter:transport_ref()},
RecvData :: term(),
Opt :: diameter:transport_opt(),
- SvcOpts :: [diameter:service_opt()],
- SvcName :: diameter:service_name().
+ SvcOpts :: [diameter:service_opt()].
start({_,_} = Type, T) ->
Ack = make_ref(),
@@ -105,7 +108,6 @@ init(T) ->
i({Ack, T, Pid, {RecvData,
Opts,
- SvcName,
SvcOpts,
#diameter_service{applications = Apps,
capabilities = Caps}
@@ -118,12 +120,14 @@ i({Ack, T, Pid, {RecvData,
{_,_} = Mask = proplists:get_value(sequence, SvcOpts),
Restrict = proplists:get_value(restrict_connections, SvcOpts),
Nodes = restrict_nodes(Restrict),
+ Dict0 = common_dictionary(Apps),
#watchdog{parent = Pid,
- transport = start(T, Opts, Mask, Nodes, Svc),
+ transport = start(T, Opts, Mask, Nodes, Dict0, Svc),
tw = proplists:get_value(watchdog_timer,
Opts,
?DEFAULT_TW_INIT),
- message_data = {RecvData, SvcName, Apps, Mask},
+ receive_data = RecvData,
+ dictionary = Dict0,
sequence = Mask,
restrict = {Restrict, lists:member(node(), Nodes)}}.
@@ -137,11 +141,60 @@ wait(Ref, Pid) ->
%% start/5
-start(T, Opts, Mask, Nodes, Svc) ->
+start(T, Opts, Mask, Nodes, Dict0, Svc) ->
{_MRef, Pid}
- = diameter_peer_fsm:start(T, Opts, {Mask, Nodes, Svc}),
+ = diameter_peer_fsm:start(T, Opts, {Mask, Nodes, Dict0, Svc}),
Pid.
+%% common_dictionary/1
+%%
+%% Determine the dictionary of the Diameter common application with
+%% Application Id 0. Fail on config errors.
+
+common_dictionary(Apps) ->
+ case
+ orddict:fold(fun dict0/3,
+ false,
+ lists:foldl(fun(#diameter_app{dictionary = M}, D) ->
+ orddict:append(M:id(), M, D)
+ end,
+ orddict:new(),
+ Apps))
+ of
+ {value, Mod} ->
+ Mod;
+ false ->
+ %% A transport should configure a common dictionary but
+ %% don't require it. Not configuring a common dictionary
+ %% means a user won't be able either send of receive
+ %% messages in the common dictionary: incoming request
+ %% will be answered with 3007 and outgoing requests cannot
+ %% be sent. The dictionary returned here is oly used for
+ %% messages diameter sends and receives: CER/CEA, DPR/DPA
+ %% and DWR/DWA.
+ ?BASE
+ end.
+
+%% Each application should be represented by a single dictionary.
+dict0(Id, [_,_|_] = Ms, _) ->
+ config_error({multiple_dictionaries, Ms, {application_id, Id}});
+
+%% An explicit common dictionary.
+dict0(?APP_ID_COMMON, [Mod], _) ->
+ {value, Mod};
+
+%% A pure relay, in which case the common application is implicit.
+%% This uses the fact that the common application will already have
+%% been folded.
+dict0(?APP_ID_RELAY, _, false) ->
+ {value, ?BASE};
+
+dict0(_, _, Acc) ->
+ Acc.
+
+config_error(T) ->
+ ?ERROR({configuration_error, T}).
+
%% handle_call/3
handle_call(_, _, State) ->
@@ -353,16 +406,16 @@ getr(Key) ->
eraser(Key) ->
erase({?MODULE, Key}).
-%% encode/2
+%% encode/3
-encode(Msg, Mask) ->
+encode(Msg, Mask, Dict) ->
Seq = diameter_session:sequence(Mask),
Hdr = #diameter_header{version = ?DIAMETER_VERSION,
end_to_end_id = Seq,
hop_by_hop_id = Seq},
Pkt = #diameter_packet{header = Hdr,
msg = Msg},
- #diameter_packet{bin = Bin} = diameter_codec:encode(?BASE, Pkt),
+ #diameter_packet{bin = Bin} = diameter_codec:encode(Dict, Pkt),
Bin.
%% okay/3
@@ -416,9 +469,10 @@ tw({M,F,A}) ->
send_watchdog(#watchdog{pending = false,
transport = TPid,
+ dictionary = Dict0,
sequence = Mask}
= S) ->
- send(TPid, {send, encode(getr(dwr), Mask)}),
+ send(TPid, {send, encode(getr(dwr), Mask, Dict0)}),
?LOG(send, 'DWR'),
S#watchdog{pending = true}.
@@ -446,8 +500,9 @@ rcv(N, _, _)
false;
rcv(_, Pkt, #watchdog{transport = TPid,
- message_data = T}) ->
- diameter_service:receive_message(TPid, Pkt, T).
+ dictionary = Dict0,
+ receive_data = T}) ->
+ diameter_traffic:receive_message(TPid, Pkt, Dict0, T).
throwaway(S) ->
throw({?MODULE, throwaway, S}).
@@ -627,13 +682,15 @@ restart(S) ->
%% state down rather then initial when receiving notification of an
%% open connection.
-restart({{connect, _} = T, Opts, Svc}, #watchdog{parent = Pid,
- sequence = Mask,
- restrict = {R,_}}
- = S) ->
+restart({{connect, _} = T, Opts, Svc},
+ #watchdog{parent = Pid,
+ sequence = Mask,
+ restrict = {R,_},
+ dictionary = Dict0}
+ = S) ->
send(Pid, {reconnect, self()}),
Nodes = restrict_nodes(R),
- S#watchdog{transport = start(T, Opts, Mask, Nodes, Svc),
+ S#watchdog{transport = start(T, Opts, Mask, Nodes, Dict0, Svc),
restrict = {R, lists:member(node(), Nodes)}};
%% No restriction on the number of connections to the same peer: just
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-25 19:01:25 +0000