diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/diameter/doc/src/diameter_app.xml | 24 | ||||
| -rw-r--r-- | lib/diameter/src/base/diameter_service.erl | 49 |
2 files changed, 46 insertions, 27 deletions
diff --git a/lib/diameter/doc/src/diameter_app.xml b/lib/diameter/doc/src/diameter_app.xml index ac056c2d39..b6870f7c28 100644 --- a/lib/diameter/doc/src/diameter_app.xml +++ b/lib/diameter/doc/src/diameter_app.xml @@ -382,7 +382,7 @@ communicate transport (or any other) data to the callback.</p> <p> A returned <seealso marker="#packet">packet()</seealso> can set the <c>header</c> field to a -<c>#diameter_header{}</c> in order to specify values that should +<c>#diameter_header{}</c> to specify values that should be preserved in the outgoing request, values otherwise being those in the header record contained in <c>Packet</c>. A returned <c>length</c>, <c>cmd_code</c> or <c>application_id</c> is @@ -537,7 +537,8 @@ not selected.</p> | {relay, [Opt]} | discard | {eval|eval_packet, Action, PostF}</v> -<v>Reply = {reply, <seealso marker="#message">message()</seealso>} +<v>Reply = {reply, <seealso marker="#packet">packet()</seealso> + | <seealso marker="#message">message()</seealso>} | {protocol_error, 3000..3999}</v> <v>Opt = <seealso marker="diameter#call_opt">diameter:call_opt()</seealso></v> <v>PostF = <seealso marker="diameter#evaluable">diameter:evaluable()</seealso></v> @@ -568,7 +569,7 @@ The argument <seealso marker="#packet">packet()</seealso> has the following sign </code> <p> -The <c>msg</c> field will be <c>undefined</c> only in case the request has +The <c>msg</c> field will be <c>undefined</c> in case the request has been received in the relay application. Otherwise it contains the record representing the request as outlined in <seealso @@ -590,19 +591,26 @@ the relay application.</p> The <c>transport_data</c> field contains an arbitrary term passed into diameter from the transport module in question, or the atom <c>undefined</c> if the transport specified no data. -The term is preserved in the <seealso marker="#packet">packet()</seealso> containing any answer message -sent back to the transport process unless another value is explicitly -specified.</p> +The term is preserved if a <seealso +marker="#packet">message()</seealso> is returned but must be set +explicitly in a returned <seealso marker="#packet">packet()</seealso>.</p> <p> The semantics of each of the possible return values are as follows.</p> <taglist> -<tag><c>{reply, <seealso marker="#message">message()</seealso>}</c></tag> +<tag><c>{reply, <seealso marker="#packet">packet()</seealso> + | <seealso marker="#message">message()</seealso>}</c></tag> <item> <p> -Send the specified answer message to the peer.</p> +Send the specified answer message to the peer. +In the case of a <seealso marker="#packet">packet()</seealso>, the +message to be sent must be set in the +<c>msg</c> field and the <c>header</c> field can be set to a +<c>#diameter_header{}</c> to specify values that should be +preserved in the outgoing answer, appropriate values otherwise +being set by diameter.</p> </item> <tag><c>{protocol_error, 3000..3999}</c></tag> diff --git a/lib/diameter/src/base/diameter_service.erl b/lib/diameter/src/base/diameter_service.erl index 0a0fd6ded1..467bb585cd 100644 --- a/lib/diameter/src/base/diameter_service.erl +++ b/lib/diameter/src/base/diameter_service.erl @@ -2175,15 +2175,13 @@ reply([Msg], Dict, TPid, Fs, Pkt) 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, - transport_data = TD} - = ReqPkt) +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#diameter_packet{transport_data = TD}); + send(TPid, Pkt); %% Or not: set Result-Code and Failed-AVP AVP's. reply(Msg, Dict, TPid, Fs, #diameter_packet{errors = [H|_] = Es} = Pkt) -> @@ -2198,23 +2196,36 @@ eval_packet(Pkt, 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, _) +make_answer_packet(Bin, #diameter_packet{transport_data = TD}) when is_binary(Bin) -> - #diameter_packet{bin = Bin}; -make_answer_packet([#diameter_header{} | _] = Msg, _) -> - #diameter_packet{msg = Msg}; - -%% Otherwise 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. -make_answer_packet(Msg, #diameter_packet{header = ReqHdr}) -> - Hdr = ReqHdr#diameter_header{version = ?DIAMETER_VERSION, - is_request = false, - is_error = undefined, - is_retransmitted = false}, - #diameter_packet{header = Hdr, - msg = Msg}. + #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 |