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authorAndreas Schultz <[email protected]>2016-01-07 15:06:09 +0100
committerIngela Anderton Andin <[email protected]>2016-06-13 22:24:14 +0200
commit5093b28115a674bfa26b06239f2c28981cbf73c2 (patch)
tree4b17bd1da48f8636257ca8c0c060180a2761b793 /lib/ssl/src/dtls_handshake.erl
parent1e967711800a38575f78dd9f82373fa1b39c8f76 (diff)
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dtls: rework/simplify DTLS fragment decoder
changed: * initialize deocder state when needed * remove retransmission indicator support
Diffstat (limited to 'lib/ssl/src/dtls_handshake.erl')
-rw-r--r--lib/ssl/src/dtls_handshake.erl78
1 files changed, 38 insertions, 40 deletions
diff --git a/lib/ssl/src/dtls_handshake.erl b/lib/ssl/src/dtls_handshake.erl
index dbb03096ab..a22961ccca 100644
--- a/lib/ssl/src/dtls_handshake.erl
+++ b/lib/ssl/src/dtls_handshake.erl
@@ -25,7 +25,7 @@
-export([client_hello/8, client_hello/9, hello/4,
get_dtls_handshake/2,
- %%dtls_handshake_new_flight/1, dtls_handshake_new_epoch/1,
+ dtls_handshake_new_flight/1, dtls_handshake_new_epoch/1,
encode_handshake/3]).
-type dtls_handshake() :: #client_hello{} | #hello_verify_request{} |
@@ -141,39 +141,47 @@ encode_handshake(Handshake, Version, MsgSeq) ->
{Enc, Frag}.
%%--------------------------------------------------------------------
--spec get_dtls_handshake(#ssl_tls{}, #dtls_hs_state{} | binary()) ->
+-spec get_dtls_handshake(#ssl_tls{}, #dtls_hs_state{} | undefined) ->
{[dtls_handshake()], #dtls_hs_state{}} | {retransmit, #dtls_hs_state{}}.
%%
%% Description: Given a DTLS state and new data from ssl_record, collects
%% and returns it as a list of handshake messages, also returns a new
%% DTLS state
%%--------------------------------------------------------------------
-get_dtls_handshake(Record, <<>>) ->
- get_dtls_handshake_aux(Record, #dtls_hs_state{}); %% Init handshake state!?
-get_dtls_handshake(Record, HsState) ->
- get_dtls_handshake_aux(Record, HsState).
+get_dtls_handshake(Records, undefined) ->
+ HsState = #dtls_hs_state{highest_record_seq = 0,
+ starting_read_seq = 0,
+ fragments = gb_trees:empty(),
+ completed = []},
+ get_dtls_handshake(Records, HsState);
+get_dtls_handshake(Records, HsState0) when is_list(Records) ->
+ HsState1 = lists:foldr(fun get_dtls_handshake_aux/2, HsState0, Records),
+ get_dtls_handshake_completed(HsState1);
+get_dtls_handshake(Record, HsState0) when is_record(Record, ssl_tls) ->
+ HsState1 = get_dtls_handshake_aux(Record, HsState0),
+ get_dtls_handshake_completed(HsState1).
-%% %%--------------------------------------------------------------------
-%% -spec dtls_handshake_new_epoch(#dtls_hs_state{}) -> #dtls_hs_state{}.
-%% %%
-%% %% Description: Reset the DTLS decoder state for a new Epoch
-%% %%--------------------------------------------------------------------
+%%--------------------------------------------------------------------
+-spec dtls_handshake_new_epoch(#dtls_hs_state{}) -> #dtls_hs_state{}.
+%%
+%% Description: Reset the DTLS decoder state for a new Epoch
+%%--------------------------------------------------------------------
%% dtls_handshake_new_epoch(<<>>) ->
%% dtls_hs_state_init();
-%% dtls_handshake_new_epoch(HsState) ->
-%% HsState#dtls_hs_state{highest_record_seq = 0,
-%% starting_read_seq = HsState#dtls_hs_state.current_read_seq,
-%% fragments = gb_trees:empty(), completed = []}.
-
-%% %--------------------------------------------------------------------
-%% -spec dtls_handshake_new_flight(integer() | undefined) -> #dtls_hs_state{}.
-%% %
-%% % Description: Init the DTLS decoder state for a new Flight
-%% dtls_handshake_new_flight(ExpectedReadReq) ->
-%% #dtls_hs_state{current_read_seq = ExpectedReadReq,
-%% highest_record_seq = 0,
-%% starting_read_seq = 0,
-%% fragments = gb_trees:empty(), completed = []}.
+dtls_handshake_new_epoch(HsState) ->
+ HsState#dtls_hs_state{highest_record_seq = 0,
+ starting_read_seq = HsState#dtls_hs_state.current_read_seq,
+ fragments = gb_trees:empty(), completed = []}.
+
+%--------------------------------------------------------------------
+-spec dtls_handshake_new_flight(integer() | undefined) -> #dtls_hs_state{}.
+%
+% Description: Init the DTLS decoder state for a new Flight
+dtls_handshake_new_flight(ExpectedReadReq) ->
+ #dtls_hs_state{current_read_seq = ExpectedReadReq,
+ highest_record_seq = 0,
+ starting_read_seq = 0,
+ fragments = gb_trees:empty(), completed = []}.
%%--------------------------------------------------------------------
%%% Internal functions
@@ -189,6 +197,9 @@ handle_server_hello_extensions(Version, SessionId, Random, CipherSuite,
{Version, SessionId, ConnectionStates, ProtoExt, Protocol}
end.
+get_dtls_handshake_completed(HsState = #dtls_hs_state{completed = Completed}) ->
+ {lists:reverse(Completed), HsState#dtls_hs_state{completed = []}}.
+
get_dtls_handshake_aux(#ssl_tls{version = Version,
sequence_number = SeqNo,
fragment = Data}, HsState) ->
@@ -203,25 +214,18 @@ get_dtls_handshake_aux(Version, SeqNo,
case reassemble_dtls_fragment(SeqNo, Type, Length, MessageSeq,
FragmentOffset, FragmentLength,
Body, HsState0) of
- {retransmit, HsState1} ->
- case Rest of
- <<>> ->
- {retransmit, HsState1};
- _ ->
- get_dtls_handshake_aux(Version, SeqNo, Rest, HsState1)
- end;
{HsState1, HighestSeqNo, MsgBody} ->
HsState2 = dec_dtls_fragment(Version, HighestSeqNo, Type, Length, MessageSeq, MsgBody, HsState1),
HsState3 = process_dtls_fragments(Version, HsState2),
get_dtls_handshake_aux(Version, SeqNo, Rest, HsState3);
+
HsState2 ->
HsState3 = process_dtls_fragments(Version, HsState2),
get_dtls_handshake_aux(Version, SeqNo, Rest, HsState3)
end;
get_dtls_handshake_aux(_Version, _SeqNo, <<>>, HsState) ->
- {lists:reverse(HsState#dtls_hs_state.completed),
- HsState#dtls_hs_state{completed = []}}.
+ HsState.
dec_dtls_fragment(Version, SeqNo, Type, Length, MessageSeq, MsgBody,
HsState = #dtls_hs_state{highest_record_seq = HighestSeqNo, completed = Acc}) ->
@@ -288,12 +292,6 @@ reassemble_dtls_fragment(SeqNo, _Type, Length, MessageSeq, 0, Length,
{HsState, SeqNo, Body};
reassemble_dtls_fragment(_SeqNo, _Type, Length, MessageSeq, 0, Length,
- _Body, HsState =
- #dtls_hs_state{current_read_seq = CurrentReadSeq})
- when MessageSeq < CurrentReadSeq ->
- {retransmit, HsState};
-
-reassemble_dtls_fragment(_SeqNo, _Type, Length, MessageSeq, 0, Length,
_Body, HsState = #dtls_hs_state{current_read_seq = CurrentReadSeq})
when MessageSeq < CurrentReadSeq ->
HsState;