expose info callback constants

[Jean-Paul Calderone]

OpenSSL.SSL.Context.set_info_callback lets apps register a function which is called periodically to indicate progress at the SSL layer. This callback receives a bitvector, and OpenSSL defines various constants for inspecting this bitvector:

#define SSL_ST_CONNECT 0x1000
#define SSL_ST_ACCEPT 0x2000
#define SSL_ST_MASK 0x0FFF
#define SSL_ST_INIT (SSL_ST_CONNECT|SSL_ST_ACCEPT)
#define SSL_ST_BEFORE 0x4000
#define SSL_ST_OK 0x03
#define SSL_ST_RENEGOTIATE (0x04|SSL_ST_INIT)

#define SSL_CB_LOOP 0x01
#define SSL_CB_EXIT 0x02
#define SSL_CB_READ 0x04
#define SSL_CB_WRITE 0x08
#define SSL_CB_ALERT 0x4000 /* used in callback */
#define SSL_CB_READ_ALERT (SSL_CB_ALERT|SSL_CB_READ)
#define SSL_CB_WRITE_ALERT (SSL_CB_ALERT|SSL_CB_WRITE)
#define SSL_CB_ACCEPT_LOOP (SSL_ST_ACCEPT|SSL_CB_LOOP)
#define SSL_CB_ACCEPT_EXIT (SSL_ST_ACCEPT|SSL_CB_EXIT)
#define SSL_CB_CONNECT_LOOP (SSL_ST_CONNECT|SSL_CB_LOOP)
#define SSL_CB_CONNECT_EXIT (SSL_ST_CONNECT|SSL_CB_EXIT)
#define SSL_CB_HANDSHAKE_START 0x10
#define SSL_CB_HANDSHAKE_DONE 0x20

It would be good to expose these values via pyOpenSSL.