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/*
* 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