dynamic_loader_path_filter_imp.h

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/* Copyright (c) 2016, 2024, Oracle and/or its affiliates.
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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#ifndef MYSQL_SERVER_DYNAMIC_LOADER_PATH_FILTER_H
#define MYSQL_SERVER_DYNAMIC_LOADER_PATH_FILTER_H
 
#include <mysql/components/component_implementation.h>
#include <mysql/components/service_implementation.h>
#include <string>
 
/**
  Checks if path specified to load is contained in plug-in directory and
  change it to absolute one using plug-in directory. Calls wrapped file scheme
  service implementation on calculated absolute URN. Effectively it act as a
  filtering and mapping service.
*/
class mysql_dynamic_loader_scheme_file_path_filter_imp {
 public:
  /**
    Checks if path specified to load is contained in plug-in directory and
    change it to absolute one using plug-in directory. Calls wrapped file scheme
    service implementation on calculated absolute URN.
 
    @param urn URN to file to load components from.
    @param [out] out_data Pointer to pointer to MySQL component data structures
      to set result components data retrieved from specified file.
    @return Status of performed operation
    @retval false success
    @retval true failure
  */
  static DEFINE_BOOL_METHOD(load,
                            (const char *urn, mysql_component_t **out_data));
 
  /**
    Checks if path specified to load is contained in plug-in directory and
    change it to absolute one using plug-in directory. Calls wrapped file scheme
    service implementation on calculated absolute URN.
 
    @param urn URN to file to unload all components from.
    @return Status of performed operation
    @retval false success
    @retval true failure
  */
  static DEFINE_BOOL_METHOD(unload, (const char *urn));
 
 private:
  /**
    Ensure that the dynamic library doesn't have a path.
    This is done to ensure that only approved libraries from the
    plug-in directory are used (to make this even remotely secure).
    Extracts real absolute path to file in plug-in directory.
 
    @param input_urn URN with path to validate and make absolute.
    @param [out] out_path String to put result URN to.
  */
  static bool check_and_make_absolute_urn(const char *input_urn,
                                          std::string &out_path);
};
 
#endif /* MYSQL_SERVER_DYNAMIC_LOADER_PATH_FILTER_H */