Export connection's SSL/TLS version

Summary: Right now MySQL doesn't export the SSL/TLS version that was used for connecting.  This provides a function that can be called by the client to get that information.

Reviewed By: lth

Differential Revision: D34912346

Author: jkedgar

include/mysql.h

@@ -476,6 +476,7 @@ MYSQL *STDCALL mysql_init(MYSQL *mysql);
 bool STDCALL mysql_ssl_set(MYSQL *mysql, const char *key, const char *cert,
                            const char *ca, const char *capath,
                            const char *cipher);
+const char* STDCALL mysql_get_ssl_version(MYSQL *mysql);
 const char *STDCALL mysql_get_ssl_cipher(MYSQL *mysql);
 bool STDCALL mysql_get_ssl_session_reused(MYSQL *mysql);
 void *STDCALL mysql_get_ssl_session_data(MYSQL *mysql, unsigned int n_ticket,

include/mysql.h.pp

@@ -676,6 +676,7 @@
 bool mysql_ssl_set(MYSQL *mysql, const char *key, const char *cert,
                            const char *ca, const char *capath,
                            const char *cipher);
+const char * mysql_get_ssl_version(MYSQL *mysql);
 const char * mysql_get_ssl_cipher(MYSQL *mysql);
 bool mysql_get_ssl_session_reused(MYSQL *mysql);
 void * mysql_get_ssl_session_data(MYSQL *mysql, unsigned int n_ticket,

libmysql/CMakeLists.txt

@@ -157,6 +157,7 @@ SET(CLIENT_API_FUNCTIONS
   net_flush
   net_clear
   my_net_write
+  mysql_get_ssl_version
 
   CACHE INTERNAL "Functions exported by client API"
 )

sql-common/client.cc

@@ -3624,6 +3624,22 @@ static void mysql_ssl_free(MYSQL *mysql) {
   mysql->connector_fd = nullptr;
 }
 
+/*
+  Return the TLS/SSL version (if any) used for current
+  connection to the server.
+
+  SYNOPSYS
+    mysql_get_ssl_version()
+      mysql pointer to the mysql connection
+*/
+
+const char* STDCALL mysql_get_ssl_version(MYSQL *mysql MY_ATTRIBUTE((unused))) {
+  DBUG_TRACE;
+  if (mysql->net.vio && mysql->net.vio->ssl_arg)
+    return SSL_get_version((SSL *)mysql->net.vio->ssl_arg);
+  return nullptr;
+}
+
 /*
   Return the SSL cipher (if any) used for current
   connection to the server.