ssl: Avoid dialyzer warnings in dtls code

Even if DTLS is not finished, e.i. not runnable yet we
want to phase in the code together with refactoring of TLS code,
but without introducing warnings in the release.

1 files changed, 14 insertions, 9 deletions

diff --git a/lib/ssl/src/dtls_record.erl b/lib/ssl/src/dtls_record.erl
index 531e2612a5..a7bbb6bc40 100644
--- a/lib/ssl/src/dtls_record.erl
+++ b/lib/ssl/src/dtls_record.erl
@@ -46,6 +46,11 @@
 -export([init_connection_state_seq/2, current_connection_state_epoch/2,
 	 set_connection_state_by_epoch/3, connection_state_by_epoch/3]).
 
+-export_type([dtls_version/0, dtls_atom_version/0]).
+
+-type dtls_version()       :: ssl_record:ssl_version().
+-type dtls_atom_version()  :: dtlsv1 | 'dtlsv1.2'.
+
 -compile(inline).
 
 %%====================================================================
@@ -155,7 +160,7 @@ decode_cipher_text(#ssl_tls{type = Type, version = Version,
 	    ?ALERT_REC(?FATAL, ?BAD_RECORD_MAC)
     end.
 %%--------------------------------------------------------------------
--spec encode_handshake(iolist(), tls_version(), #connection_states{}) ->
+-spec encode_handshake(iolist(), dtls_version(), #connection_states{}) ->
 			      {iolist(), #connection_states{}}.
 %%
 %% Description: Encodes a handshake message to send on the ssl-socket.
@@ -164,7 +169,7 @@ encode_handshake(Frag, Version, ConnectionStates) ->
     encode_plain_text(?HANDSHAKE, Version, Frag, ConnectionStates).
 
 %%--------------------------------------------------------------------
--spec encode_change_cipher_spec(tls_version(), #connection_states{}) ->
+-spec encode_change_cipher_spec(dtls_version(), #connection_states{}) ->
 				       {iolist(), #connection_states{}}.
 %%
 %% Description: Encodes a change_cipher_spec-message to send on the ssl socket.
@@ -173,8 +178,8 @@ encode_change_cipher_spec(Version, ConnectionStates) ->
     encode_plain_text(?CHANGE_CIPHER_SPEC, Version, <<1:8>>, ConnectionStates).
 
 %%--------------------------------------------------------------------
--spec protocol_version(tls_atom_version() | tls_version()) ->
-			      tls_version() | tls_atom_version().
+-spec protocol_version(dtls_atom_version() | dtls_version()) ->
+			      dtls_version() | dtls_atom_version().
 %%
 %% Description: Creates a protocol version record from a version atom
 %% or vice versa.
@@ -188,7 +193,7 @@ protocol_version({254, 253}) ->
 protocol_version({254, 255}) ->
     dtlsv1.
 %%--------------------------------------------------------------------
--spec lowest_protocol_version(tls_version(), tls_version()) -> tls_version().
+-spec lowest_protocol_version(dtls_version(), dtls_version()) -> dtls_version().
 %%
 %% Description: Lowes protocol version of two given versions
 %%--------------------------------------------------------------------
@@ -201,7 +206,7 @@ lowest_protocol_version(Version = {M,_}, {N, _}) when M > N ->
 lowest_protocol_version(_,Version) ->
     Version.
 %%--------------------------------------------------------------------
--spec highest_protocol_version([tls_version()]) -> tls_version().
+-spec highest_protocol_version([dtls_version()]) -> dtls_version().
 %%
 %% Description: Highest protocol version present in a list
 %%--------------------------------------------------------------------
@@ -221,7 +226,7 @@ highest_protocol_version(_, [Version | Rest]) ->
 
 
 %%--------------------------------------------------------------------
--spec supported_protocol_versions() -> [tls_version()].
+-spec supported_protocol_versions() -> [dtls_version()].
 %%
 %% Description: Protocol versions supported
 %%--------------------------------------------------------------------
@@ -252,7 +257,7 @@ supported_connection_protocol_versions([]) ->
     ?ALL_DATAGRAM_SUPPORTED_VERSIONS.
 
 %%--------------------------------------------------------------------
--spec is_acceptable_version(tls_version(), Supported :: [tls_version()]) -> boolean().
+-spec is_acceptable_version(dtls_version(), Supported :: [dtls_version()]) -> boolean().
 %%
 %% Description: ssl version 2 is not acceptable security risks are too big.
 %%
@@ -262,7 +267,7 @@ is_acceptable_version(Version, Versions) ->
 
 
 %%--------------------------------------------------------------------
--spec init_connection_state_seq(tls_version(), #connection_states{}) ->
+-spec init_connection_state_seq(dtls_version(), #connection_states{}) ->
 				       #connection_state{}.
 %%
 %% Description: Copy the read sequence number to the write sequence number