diff options
Diffstat (limited to 'lib/ssl/src/dtls_connection.erl')
| -rw-r--r-- | lib/ssl/src/dtls_connection.erl | 81 |
1 files changed, 71 insertions, 10 deletions
diff --git a/lib/ssl/src/dtls_connection.erl b/lib/ssl/src/dtls_connection.erl index 014e915e12..3ebc340ff8 100644 --- a/lib/ssl/src/dtls_connection.erl +++ b/lib/ssl/src/dtls_connection.erl @@ -54,7 +54,7 @@ %% Data handling -export([%%write_application_data/3, read_application_data/2, - %%passive_receive/2, + passive_receive/2, next_record_if_active/1 %%, %%handle_common_event/4 ]). @@ -356,20 +356,81 @@ format_status(Type, Data) -> %%% Internal functions %%-------------------------------------------------------------------- encode_handshake(Handshake, Version, ConnectionStates0, Hist0) -> - Seq = sequence(ConnectionStates0), - {EncHandshake, FragmentedHandshake} = dtls_handshake:encode_handshake(Handshake, Version, - Seq), + {Seq, ConnectionStates} = sequence(ConnectionStates0), + {EncHandshake, Frag} = dtls_handshake:encode_handshake(Handshake, Version, Seq), Hist = ssl_handshake:update_handshake_history(Hist0, EncHandshake), - {Encoded, ConnectionStates} = - dtls_record:encode_handshake(FragmentedHandshake, - Version, ConnectionStates0), - {Encoded, ConnectionStates, Hist}. + {Frag, ConnectionStates, Hist}. encode_change_cipher(#change_cipher_spec{}, Version, ConnectionStates) -> dtls_record:encode_change_cipher_spec(Version, ConnectionStates). -decode_alerts(Bin) -> - ssl_alert:decode(Bin). +encode_handshake_flight(Flight, ConnectionStates) -> + MSS = 1400, + encode_handshake_records(Flight, ConnectionStates, MSS, init_pack_records()). + +encode_handshake_records([], CS, _MSS, Recs) -> + {finish_pack_records(Recs), CS}; + +encode_handshake_records([{Version, _Epoch, Frag = #change_cipher_spec{}}|Tail], ConnectionStates0, MSS, Recs0) -> + {Encoded, ConnectionStates} = + encode_change_cipher(Frag, Version, ConnectionStates0), + Recs = append_pack_records([Encoded], MSS, Recs0), + encode_handshake_records(Tail, ConnectionStates, MSS, Recs); + +encode_handshake_records([{Version, Epoch, {MsgType, MsgSeq, Bin}}|Tail], CS0, MSS, Recs0 = {Buf0, _}) -> + Space = MSS - iolist_size(Buf0), + Len = byte_size(Bin), + {Encoded, CS} = + encode_handshake_record(Version, Epoch, Space, MsgType, MsgSeq, Len, Bin, 0, MSS, [], CS0), + Recs = append_pack_records(Encoded, MSS, Recs0), + encode_handshake_records(Tail, CS, MSS, Recs). + +%% TODO: move to dtls_handshake???? +encode_handshake_record(_Version, _Epoch, _Space, _MsgType, _MsgSeq, _Len, <<>>, _Offset, _MRS, Encoded, CS) + when length(Encoded) > 0 -> + %% make sure we encode at least one segment (for empty messages like Server Hello Done + {lists:reverse(Encoded), CS}; + +encode_handshake_record(Version, Epoch, Space, MsgType, MsgSeq, Len, Bin, + Offset, MRS, Encoded0, CS0) -> + MaxFragmentLen = Space - 25, + case Bin of + <<BinFragment:MaxFragmentLen/bytes, Rest/binary>> -> + ok; + _ -> + BinFragment = Bin, + Rest = <<>> + end, + FragLength = byte_size(BinFragment), + Frag = [MsgType, ?uint24(Len), ?uint16(MsgSeq), ?uint24(Offset), ?uint24(FragLength), BinFragment], + {Encoded, CS} = ssl_record:encode_handshake({Epoch, Frag}, Version, CS0), + encode_handshake_record(Version, Epoch, MRS, MsgType, MsgSeq, Len, Rest, Offset + FragLength, MRS, [Encoded|Encoded0], CS). + +init_pack_records() -> + {[], []}. + +append_pack_records([], MSS, Recs = {Buf0, Acc0}) -> + Remaining = MSS - iolist_size(Buf0), + if Remaining < 12 -> + {[], [lists:reverse(Buf0)|Acc0]}; + true -> + Recs + end; +append_pack_records([Head|Tail], MSS, {Buf0, Acc0}) -> + TotLen = iolist_size(Buf0) + iolist_size(Head), + if TotLen > MSS -> + append_pack_records(Tail, MSS, {[Head], [lists:reverse(Buf0)|Acc0]}); + true -> + append_pack_records(Tail, MSS, {[Head|Buf0], Acc0}) + end. + +finish_pack_records({[], Acc}) -> + lists:reverse(Acc); +finish_pack_records({Buf, Acc}) -> + lists:reverse([lists:reverse(Buf)|Acc]). + +%% decode_alerts(Bin) -> +%% ssl_alert:decode(Bin). initial_state(Role, Host, Port, Socket, {SSLOptions, SocketOptions}, User, {CbModule, DataTag, CloseTag, ErrorTag}) -> |