ssl: Implement DTLS state machine

Beta DTLS, not production ready. Only very basically tested, and
not everything in the SPEC is implemented and some things
are hard coded that should not be, so this implementation can not be consider
secure.

Refactor "TLS connection state" and socket handling, to facilitate
DTLS implementation.

Create dtls "listner" (multiplexor) process that spawns
DTLS connection process handlers.

Handle DTLS fragmentation.

Framework for handling retransmissions.

Replay Detection is not implemented yet.

Alerts currently always handled as in TLS.

1 files changed, 27 insertions, 16 deletions

diff --git a/lib/ssl/src/ssl_sup.erl b/lib/ssl/src/ssl_sup.erl
index ba20f65f44..8245801139 100644
--- a/lib/ssl/src/ssl_sup.erl
+++ b/lib/ssl/src/ssl_sup.erl
@@ -46,14 +46,17 @@ start_link() ->
 init([]) ->    
     SessionCertManager = session_and_cert_manager_child_spec(),
     TLSConnetionManager = tls_connection_manager_child_spec(),
-    %% Not supported yet
-    %%DTLSConnetionManager = dtls_connection_manager_child_spec(),
-    %% Handles emulated options so that they inherited by the accept socket, even when setopts is performed on 
-    %% the listen socket
+    %% Handles emulated options so that they inherited by the accept
+    %% socket, even when setopts is performed on the listen socket
     ListenOptionsTracker = listen_options_tracker_child_spec(), 
+    
+    DTLSConnetionManager = dtls_connection_manager_child_spec(),
+    DTLSUdpListeners = dtls_udp_listeners_spec(),
+
     {ok, {{one_for_all, 10, 3600}, [SessionCertManager, TLSConnetionManager, 
-				    %%DTLSConnetionManager, 
-				    ListenOptionsTracker]}}.
+				    ListenOptionsTracker,
+				    DTLSConnetionManager, DTLSUdpListeners
+				   ]}}.
 
 
 manager_opts() ->
@@ -94,24 +97,32 @@ tls_connection_manager_child_spec() ->
     Type = supervisor,
     {Name, StartFunc, Restart, Shutdown, Type, Modules}.
 
-%% dtls_connection_manager_child_spec() ->
-%%     Name = dtls_connection,
-%%     StartFunc = {dtls_connection_sup, start_link, []},
-%%     Restart = permanent,
-%%     Shutdown = 4000,
-%%     Modules = [dtls_connection, ssl_connection],
-%%     Type = supervisor,
-%%     {Name, StartFunc, Restart, Shutdown, Type, Modules}.
+dtls_connection_manager_child_spec() ->
+    Name = dtls_connection,
+    StartFunc = {dtls_connection_sup, start_link, []},
+    Restart = permanent,
+    Shutdown = 4000,
+    Modules = [dtls_connection_sup],
+    Type = supervisor,
+    {Name, StartFunc, Restart, Shutdown, Type, Modules}.
 
 listen_options_tracker_child_spec() ->
-    Name = ssl_socket,  
+    Name = tls_socket,  
     StartFunc = {ssl_listen_tracker_sup, start_link, []},
     Restart = permanent, 
     Shutdown = 4000,
-    Modules = [ssl_socket],
+    Modules = [tls_socket],
     Type = supervisor,
     {Name, StartFunc, Restart, Shutdown, Type, Modules}.
 
+dtls_udp_listeners_spec() ->
+    Name = dtls_udp_listener,  
+    StartFunc = {dtls_udp_sup, start_link, []},
+    Restart = permanent, 
+    Shutdown = 4000,
+    Modules = [],
+    Type = supervisor,
+    {Name, StartFunc, Restart, Shutdown, Type, Modules}.
 
 session_cb_init_args() ->
     case application:get_env(ssl, session_cb_init_args) of