diff options
Diffstat (limited to 'lib/diameter/src/app/diameter_capx.erl')
-rw-r--r-- | lib/diameter/src/app/diameter_capx.erl | 388 |
1 files changed, 0 insertions, 388 deletions
diff --git a/lib/diameter/src/app/diameter_capx.erl b/lib/diameter/src/app/diameter_capx.erl deleted file mode 100644 index aa5318e79d..0000000000 --- a/lib/diameter/src/app/diameter_capx.erl +++ /dev/null @@ -1,388 +0,0 @@ -%% -%% %CopyrightBegin% -%% -%% Copyright Ericsson AB 2010-2011. All Rights Reserved. -%% -%% The contents of this file are subject to the Erlang Public License, -%% Version 1.1, (the "License"); you may not use this file except in -%% compliance with the License. You should have received a copy of the -%% Erlang Public License along with this software. If not, it can be -%% retrieved online at http://www.erlang.org/. -%% -%% Software distributed under the License is distributed on an "AS IS" -%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See -%% the License for the specific language governing rights and limitations -%% under the License. -%% -%% %CopyrightEnd% -%% - -%% -%% This module builds CER and CEA records for use during capabilities -%% exchange. All of a CER/CEA is built from AVP values configured on -%% the service in question but values for Supported-Vendor-Id, -%% Vendor-Specific-Application-Id, Auth-Application-Id and -%% Acct-Application-id are also obtained using an older method that -%% remains only for backwards compatibility. With this method, each -%% dictionary module was required to export a cer/0 that returned a -%% diameter_base_CER record (or corresponding list, although the list -%% is also a later addition). Each returned CER contributes its member -%% values for the aforementioned four AVPs to the resulting CER, with -%% remaining AVP's either unspecified or identical to those configured -%% on the service. Auth-Application-Id and Acct-Application-id were -%% originally treated a little differently, each callback being -%% required to return either no value of the same value as the other -%% callbacks, but this coupled the callback modules unnecessarily. (A -%% union is backwards compatible to boot.) -%% -%% Values obtained from the service and callbacks are all included -%% when building a CER. Older code with only callback can continue to -%% use them, newer code should probably stick to service configuration -%% (since this is more explicit) or mix at their own peril. -%% -%% The cer/0 callback is now undocumented (despite never being fully -%% documented to begin with) and should be considered deprecated even -%% by those poor souls still using it. -%% - --module(diameter_capx). - --export([build_CER/1, - recv_CER/2, - recv_CEA/2, - make_caps/2]). - --include_lib("diameter/include/diameter.hrl"). --include("diameter_internal.hrl"). --include("diameter_types.hrl"). --include("diameter_gen_base_rfc3588.hrl"). - --define(SUCCESS, ?'DIAMETER_BASE_RESULT-CODE_DIAMETER_SUCCESS'). --define(NOAPP, ?'DIAMETER_BASE_RESULT-CODE_DIAMETER_NO_COMMON_APPLICATION'). --define(NOSECURITY, ?'DIAMETER_BASE_RESULT-CODE_DIAMETER_NO_COMMON_SECURITY'). - --define(NO_INBAND_SECURITY, 0). - -%% =========================================================================== - --type tried(T) :: {ok, T} | {error, {term(), list()}}. - --spec build_CER(#diameter_caps{}) - -> tried(#diameter_base_CER{}). - -build_CER(Caps) -> - try_it([fun bCER/1, Caps]). - --spec recv_CER(#diameter_base_CER{}, #diameter_service{}) - -> tried({['Unsigned32'()], #diameter_caps{}, #diameter_base_CEA{}}). - -recv_CER(CER, Svc) -> - try_it([fun rCER/2, CER, Svc]). - --spec recv_CEA(#diameter_base_CEA{}, #diameter_service{}) - -> tried({['Unsigned32'()], #diameter_caps{}}). - -recv_CEA(CEA, Svc) -> - try_it([fun rCEA/2, CEA, Svc]). - -make_caps(Caps, Opts) -> - try_it([fun mk_caps/2, Caps, Opts]). - -%% =========================================================================== -%% =========================================================================== - -try_it([Fun | Args]) -> - try apply(Fun, Args) of - T -> {ok, T} - catch - throw: ?FAILURE(Reason) -> {error, {Reason, Args}} - end. - -%% mk_caps/2 - -mk_caps(Caps0, Opts) -> - {Caps, _} = lists:foldl(fun set_cap/2, - {Caps0, #diameter_caps{_ = false}}, - Opts), - Caps. - --define(SC(K,F), - set_cap({K, Val}, {Caps, #diameter_caps{F = false} = C}) -> - {Caps#diameter_caps{F = cap(K, Val)}, C#diameter_caps{F = true}}). - -?SC('Origin-Host', origin_host); -?SC('Origin-Realm', origin_realm); -?SC('Host-IP-Address', host_ip_address); -?SC('Vendor-Id', vendor_id); -?SC('Product-Name', product_name); -?SC('Origin-State-Id', origin_state_id); -?SC('Supported-Vendor-Id', supported_vendor_id); -?SC('Auth-Application-Id', auth_application_id); -?SC('Inband-Security-Id', inband_security_id); -?SC('Acct-Application-Id', acct_application_id); -?SC('Vendor-Specific-Application-Id', vendor_specific_application_id); -?SC('Firmware-Revision', firmware_revision); - -set_cap({Key, _}, _) -> - ?THROW({duplicate, Key}). - -cap(K, V) when K == 'Origin-Host'; - K == 'Origin-Realm'; - K == 'Vendor-Id'; - K == 'Product-Name' -> - V; - -cap('Host-IP-Address', Vs) - when is_list(Vs) -> - lists:map(fun ipaddr/1, Vs); - -cap('Firmware-Revision', V) -> - [V]; - -%% Not documented but accept it as long as it's what we support. -cap('Inband-Security-Id', [0] = Vs) -> %% NO_INBAND_SECURITY - Vs; - -cap(K, Vs) when K /= 'Inband-Security-Id', is_list(Vs) -> - Vs; - -cap(K, V) -> - ?THROW({invalid, K, V}). - -ipaddr(A) -> - try - diameter_lib:ipaddr(A) - catch - error: {invalid_address, _} = T -> - ?THROW(T) - end. - -%% bCER/1 -%% -%% Build a CER record to send to a remote peer. - -bCER(#diameter_caps{origin_host = Host, - origin_realm = Realm, - host_ip_address = Addrs, - vendor_id = Vid, - product_name = Name, - origin_state_id = OSI, - supported_vendor_id = SVid, - auth_application_id = AuId, - acct_application_id = AcId, - vendor_specific_application_id = VSA, - firmware_revision = Rev}) -> - #diameter_base_CER{'Origin-Host' = Host, - 'Origin-Realm' = Realm, - 'Host-IP-Address' = Addrs, - 'Vendor-Id' = Vid, - 'Product-Name' = Name, - 'Origin-State-Id' = OSI, - 'Supported-Vendor-Id' = SVid, - 'Auth-Application-Id' = AuId, - 'Acct-Application-Id' = AcId, - 'Vendor-Specific-Application-Id' = VSA, - 'Firmware-Revision' = Rev}. - -%% rCER/2 -%% -%% 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 -%% here: should we advertise applications that the peer hasn't sent in -%% its CER (aside from the relay application) or not? If we send -%% applications that the peer hasn't advertised then the peer may have -%% to be aware of the possibility. If we don't then we just look like -%% a server that supports a subset (possibly) of what the client -%% advertised, so this feels like the path of least incompatibility. -%% However, the current draft standard (draft-ietf-dime-rfc3588bis-26, -%% expires 24 July 2011) says this in section 5.3, Capabilities -%% Exchange: -%% -%% The receiver of the Capabilities-Exchange-Request (CER) MUST -%% determine common applications by computing the intersection of its -%% own set of supported Application Id against all of the application -%% identifier AVPs (Auth-Application-Id, Acct-Application-Id and Vendor- -%% Specific-Application-Id) present in the CER. The value of the -%% Vendor-Id AVP in the Vendor-Specific-Application-Id MUST NOT be used -%% during computation. The sender of the Capabilities-Exchange-Answer -%% (CEA) SHOULD include all of its supported applications as a hint to -%% the receiver regarding all of its application capabilities. -%% -%% Both RFC and the draft also say this: -%% -%% The receiver only issues commands to its peers that have advertised -%% support for the Diameter application that defines the command. A -%% Diameter node MUST cache the supported applications in order to -%% ensure that unrecognized commands and/or AVPs are not unnecessarily -%% sent to a peer. -%% -%% That is, each side sends all of its capabilities and is responsible for -%% not sending commands that the peer doesn't support. - -%% TODO: Make it an option to send only common applications in CEA to -%% allow backwards compatibility, and also because there are likely -%% servers that expect this. Or maybe a callback. - -%% 6.10. Inband-Security-Id AVP -%% -%% NO_INBAND_SECURITY 0 -%% This peer does not support TLS. This is the default value, if the -%% AVP is omitted. - -rCER(CER, #diameter_service{capabilities = LCaps} = Svc) -> - #diameter_base_CER{'Inband-Security-Id' = RIS} - = CER, - #diameter_base_CEA{} - = CEA - = cea_from_cer(bCER(LCaps)), - - RCaps = capx_to_caps(CER), - SApps = common_applications(LCaps, RCaps, Svc), - - {SApps, - RCaps, - build_CEA([] == SApps, - RIS, - lists:member(?NO_INBAND_SECURITY, RIS), - CEA#diameter_base_CEA{'Result-Code' = ?SUCCESS, - 'Inband-Security-Id' = []})}. - -%% TODO: 5.3 of RFC3588 says we MUST return DIAMETER_NO_COMMON_APPLICATION -%% in the CEA and SHOULD disconnect the transport. However, we have -%% no way to guarantee the send before disconnecting. - -build_CEA(true, _, _, CEA) -> - CEA#diameter_base_CEA{'Result-Code' = ?NOAPP}; -build_CEA(false, [_|_], false, CEA) -> - CEA#diameter_base_CEA{'Result-Code' = ?NOSECURITY}; -build_CEA(false, [_|_], true, CEA) -> - CEA#diameter_base_CEA{'Inband-Security-Id' = [?NO_INBAND_SECURITY]}; -build_CEA(false, [], false, CEA) -> - CEA. - -%% cea_from_cer/1 - -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:'#info-'(diameter_base_CEA, {index, Field}) of - N -> - setelement(N, CEA, ?BASE:'#get-'(Field, CER)) - catch - error: _ -> - CEA - end. - -%% rCEA/2 - -rCEA(CEA, #diameter_service{capabilities = LCaps} = Svc) - when is_record(CEA, diameter_base_CEA) -> - #diameter_base_CEA{'Result-Code' = RC} - = CEA, - - RC == ?SUCCESS orelse ?THROW({'Result-Code', RC}), - - RCaps = capx_to_caps(CEA), - SApps = common_applications(LCaps, RCaps, Svc), - - [] == SApps andalso ?THROW({no_common_apps, LCaps, RCaps}), - - {SApps, RCaps}; - -rCEA(CEA, _Svc) -> - ?THROW({invalid, CEA}). - -%% 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}) -> - #diameter_caps{origin_host = OH, - origin_realm = OR, - vendor_id = VId, - product_name = PN, - origin_state_id = OSI, - host_ip_address = IP, - 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(#diameter_base_CER{} = CER) -> - capx_to_caps(cea_from_cer(CER)). - -%% --------------------------------------------------------------------------- -%% --------------------------------------------------------------------------- - -%% common_applications/3 -%% -%% Identify the (local) applications to be supported on the connection -%% in question. - -common_applications(LCaps, RCaps, #diameter_service{applications = Apps}) -> - LA = app_union(LCaps), - RA = app_union(RCaps), - - lists:foldl(fun(I,A) -> ca(I, Apps, RA, A) end, [], LA). - -ca(Id, Apps, RA, Acc) -> - Relay = lists:member(?APP_ID_RELAY, RA), - #diameter_app{alias = Alias} = find_app(Id, Apps), - tcons(Relay %% peer is a relay - orelse ?APP_ID_RELAY == Id %% we're a relay - orelse lists:member(Id, RA), %% app is supported by the peer - Id, - Alias, - Acc). -%% 5.3 of the RFC states that a peer advertising itself as a relay must -%% be interpreted as having common applications. - -%% Extract the list of all application identifiers from Auth-Application-Id, -%% Acct-Application-Id and Vendor-Specific-Application-Id. -app_union(#diameter_caps{auth_application_id = U, - acct_application_id = C, - 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). - -%% 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 -%% order to generate a more helpful error. -find_app(Id, Apps) -> - case lists:keyfind(Id, #diameter_app.id, Apps) of - #diameter_app{} = A -> - A; - false -> - ?THROW({app_not_configured, Id}) - end. - -set_list(L) -> - sets:to_list(sets:from_list(L)). - -tcons(true, K, V, Acc) -> - [{K,V} | Acc]; -tcons(false, _, _, Acc) -> - Acc. |