MDEV-19275 Provide SQL service to plugins.

Protocol_local fixed so it can be used now.
Some Protocol:: methods made virtual so they can adapt.
as well as net_ok and net_send_error functions.
execute_sql_string function is exported to the plugins.
To be changed with the mysql_use_result.

1 files changed, 15 insertions, 14 deletions

diff --git a/sql/sql_audit.h b/sql/sql_audit.h
index 97317203e34..40276c86a78 100644
--- a/sql/sql_audit.h
+++ b/sql/sql_audit.h
@@ -254,35 +254,36 @@ void mysql_audit_notify_connection_disconnect(THD *thd, int errcode)
 }
 
 static inline
-void mysql_audit_notify_connection_change_user(THD *thd)
+void mysql_audit_notify_connection_change_user(THD *thd,
+                                               const Security_context *old_ctx)
 {
   if (mysql_audit_connection_enabled())
   {
-    const Security_context *sctx= thd->security_ctx;
     mysql_event_connection event;
 
     event.event_subclass= MYSQL_AUDIT_CONNECTION_CHANGE_USER;
     event.status= thd->get_stmt_da()->is_error() ?
                   thd->get_stmt_da()->sql_errno() : 0;
     event.thread_id= (unsigned long)thd->thread_id;
-    event.user= sctx->user;
-    event.user_length= safe_strlen_uint(sctx->user);
-    event.priv_user= sctx->priv_user;
-    event.priv_user_length= strlen_uint(sctx->priv_user);
-    event.external_user= sctx->external_user;
-    event.external_user_length= safe_strlen_uint(sctx->external_user);
-    event.proxy_user= sctx->proxy_user;
-    event.proxy_user_length= strlen_uint(sctx->proxy_user);
-    event.host= sctx->host;
-    event.host_length= safe_strlen_uint(sctx->host);
-    event.ip= sctx->ip;
-    event.ip_length= safe_strlen_uint(sctx->ip);
+    event.user= old_ctx->user;
+    event.user_length= safe_strlen_uint(old_ctx->user);
+    event.priv_user= old_ctx->priv_user;
+    event.priv_user_length= strlen_uint(old_ctx->priv_user);
+    event.external_user= old_ctx->external_user;
+    event.external_user_length= safe_strlen_uint(old_ctx->external_user);
+    event.proxy_user= old_ctx->proxy_user;
+    event.proxy_user_length= strlen_uint(old_ctx->proxy_user);
+    event.host= old_ctx->host;
+    event.host_length= safe_strlen_uint(old_ctx->host);
+    event.ip= old_ctx->ip;
+    event.ip_length= safe_strlen_uint(old_ctx->ip);
     event.database= thd->db;
 
     mysql_audit_notify(thd, MYSQL_AUDIT_CONNECTION_CLASS, &event);
   }
 }
 
+
 static inline
 void mysql_audit_external_lock_ex(THD *thd, my_thread_id thread_id,
     const char *user, const char *host, const char *ip, query_id_t query_id,