Add initial state machine rewrite code

This is the first drop of the new state machine code.

The rewrite has the following objectives:
- Remove duplication of state code between client and server
- Remove duplication of state code between TLS and DTLS
- Simplify transitions and bring the logic together in a single location
  so that it is easier to validate
- Remove duplication of code between each of the message handling functions
- Receive a message first and then work out whether that is a valid
  transition - not the other way around (the other way causes lots of issues
  where we are expecting one type of message next but actually get something
  else)
- Separate message flow state from handshake state (in order to better
  understand each)
  - message flow state = when to flush buffers; handling restarts in the
    event of NBIO events; handling the common flow of steps for reading a
    message and the common flow of steps for writing a message etc
  - handshake state = what handshake message are we working on now
- Control complexity: only the state machine can change state: keep all
  the state changes local to a file

This builds on previous state machine related work:
- Surface CCS processing in the state machine
- Version negotiation rewrite

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/ssl/s3_lib.c b/ssl/s3_lib.c
index 5e7b618..292fb1b 100644
--- a/ssl/s3_lib.c
+++ b/ssl/s3_lib.c
@@ -5132,6 +5132,7 @@ int ssl3_renegotiate_check(SSL *s)
              */
             /* SSL_ST_ACCEPT */
             s->state = SSL_ST_RENEGOTIATE;
+            statem_set_renegotiate(s);
             s->s3->renegotiate = 0;
             s->s3->num_renegotiations++;
             s->s3->total_renegotiations++;