/*

* File Tree Walking EntropySource

* (C) 1999-2008 Jack Lloyd

*

* Botan is released under the Simplified BSD License (see license.txt)

*/

#ifndef BOTAN_ENTROPY_SRC_PROC_WALK_H_

#define BOTAN_ENTROPY_SRC_PROC_WALK_H_

#include <botan/entropy_src.h>

#include <botan/mutex.h>

namespace Botan {

class File_Descriptor_Source

   {

   public:

      virtual int next_fd() = 0;

      virtual ~File_Descriptor_Source() = default;

   };

/**

* File Tree Walking Entropy Source

*/

class ProcWalking_EntropySource final : public Entropy_Source

   {

   public:

      std::string name() const override { return "proc_walk"; }

      size_t poll(RandomNumberGenerator& rng) override;

      explicit ProcWalking_EntropySource(const std::string& root_dir) :

         m_path(root_dir), m_dir(nullptr) {}

   private:

      const std::string m_path;

      mutex_type m_mutex;

      std::unique_ptr<File_Descriptor_Source> m_dir;

      secure_vector<uint8_t> m_buf;

   };

}

#endif