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-rw-r--r--lib/ssl/src/dtls_connection.erl57
1 files changed, 53 insertions, 4 deletions
diff --git a/lib/ssl/src/dtls_connection.erl b/lib/ssl/src/dtls_connection.erl
index 8d7763c7cb..0864b2143a 100644
--- a/lib/ssl/src/dtls_connection.erl
+++ b/lib/ssl/src/dtls_connection.erl
@@ -52,12 +52,12 @@
]).
%% Data handling
+
-export([%%write_application_data/3,
read_application_data/2,
- passive_receive/2,
- next_record_if_active/1 %%,
- %%handle_common_event/4
- ]).
+ passive_receive/2, next_record_if_active/1,
+ %%handle_common_event/4,
+ handle_packet/3]).
%% gen_statem state functions
-export([init/3, error/3, downgrade/3, %% Initiation and take down states
@@ -586,6 +586,55 @@ handle_own_alert(_,_,_, State) -> %% Place holder
handle_normal_shutdown(_, _, _State) -> %% Place holder
ok.
+
sequence(_) ->
%%TODO real imp
1.
+
+handle_packet(Address, Port, Packet) ->
+ try dtls_record:get_dtls_records(Packet, <<>>) of
+ %% expect client hello
+ {[#ssl_tls{type = ?HANDSHAKE, version = {254, _}} = Record], <<>>} ->
+ handle_dtls_client_hello(Address, Port, Record);
+ _Other ->
+ {error, not_dtls}
+ catch
+ _Class:_Error ->
+ {error, not_dtls}
+ end.
+
+handle_dtls_client_hello(Address, Port,
+ #ssl_tls{epoch = Epoch, sequence_number = Seq,
+ version = Version} = Record) ->
+ {[{Hello, _}], _} =
+ dtls_handshake:get_dtls_handshake(Record,
+ dtls_handshake:dtls_handshake_new_flight(undefined)),
+ #client_hello{client_version = {Major, Minor},
+ random = Random,
+ session_id = SessionId,
+ cipher_suites = CipherSuites,
+ compression_methods = CompressionMethods} = Hello,
+ CookieData = [address_to_bin(Address, Port),
+ <<?BYTE(Major), ?BYTE(Minor)>>,
+ Random, SessionId, CipherSuites, CompressionMethods],
+ Cookie = crypto:hmac(sha, <<"secret">>, CookieData),
+
+ case Hello of
+ #client_hello{cookie = Cookie} ->
+ accept;
+
+ _ ->
+ %% generate HelloVerifyRequest
+ {RequestFragment, _} = dtls_handshake:encode_handshake(
+ dtls_handshake:hello_verify_request(Cookie),
+ Version, 0),
+ HelloVerifyRequest =
+ dtls_record:encode_tls_cipher_text(?HANDSHAKE, Version, Epoch, Seq, RequestFragment),
+ {reply, HelloVerifyRequest}
+ end.
+
+address_to_bin({A,B,C,D}, Port) ->
+ <<0:80,16#ffff:16,A,B,C,D,Port:16>>;
+address_to_bin({A,B,C,D,E,F,G,H}, Port) ->
+ <<A:16,B:16,C:16,D:16,E:16,F:16,G:16,H:16,Port:16>>.
+