Function handle_grant_struct

sql/sql_acl.cc:10637–10986

*/

static int handle_grant_struct(enum enum_acl_lists struct_no, bool drop,
                               LEX_USER *user_from, LEX_USER *user_to)
{
  int result= 0;
  int elements;
  bool restart;
  const char *UNINIT_VAR(user);
  const char *UNINIT_VAR(host);
  ACL_USER *acl_user= NULL;
  ACL_ROLE *acl_role= NULL;
  ACL_DB *acl_db= NULL;
  ACL_PROXY_USER *acl_proxy_user= NULL;
  GRANT_NAME *grant_name= NULL;
  ROLE_GRANT_PAIR *UNINIT_VAR(role_grant_pair);
  HASH *grant_name_hash= NULL;
  HASH *roles_mappings_hash= NULL;
  DBUG_ENTER("handle_grant_struct");
  DBUG_PRINT("info",("scan struct: %u  search: '%s'@'%s'",
                     struct_no, user_from->user.str, user_from->host.str));

  mysql_mutex_assert_owner(&acl_cache->lock);

  /* No point in querying ROLE ACL if user_from is not a role */
  if (struct_no == ROLE_ACL && user_from->host.length)
    DBUG_RETURN(0);

  /* same. no roles in PROXY_USERS_ACL */
  if (struct_no == PROXY_USERS_ACL && user_from->is_role())
    DBUG_RETURN(0);

  if (struct_no == ROLE_ACL) //no need to scan the structures in this case
  {
    acl_role= find_acl_role(user_from->user, true);
    if (!acl_role)
      DBUG_RETURN(0);

    if (!drop && !user_to) //role was found
      DBUG_RETURN(1);

    /* this calls for a role update */
    const char *old_key= acl_role->user.str;
    size_t old_key_length= acl_role->user.length;
    if (drop)
    {
      // delete the role from cross-reference arrays
      for (size_t i=0; i < acl_role->role_grants.elements; i++)
      {
        ACL_ROLE *grant= *dynamic_element(&acl_role->role_grants,
                                          i, ACL_ROLE**);
        remove_ptr_from_dynarray(&grant->parent_grantee, acl_role);
      }

      for (size_t i=0; i < acl_role->parent_grantee.elements; i++)
      {
        ACL_USER_BASE *grantee= *dynamic_element(&acl_role->parent_grantee,
                                                 i, ACL_USER_BASE**);
        remove_ptr_from_dynarray(&grantee->role_grants, acl_role);
      }