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/*************************************************
* FTW EntropySource Source File *
* (C) 1999-2007 The Botan Project *
*************************************************/
#include <botan/es_ftw.h>
#include <botan/util.h>
#include <fstream>
#include <cstring>
#include <vector>
#ifndef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 199309
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
namespace Botan {
/*************************************************
* FTW_EntropySource Constructor *
*************************************************/
FTW_EntropySource::FTW_EntropySource(const std::string& p) : path(p)
{
}
/*************************************************
* FTW Fast Poll *
*************************************************/
void FTW_EntropySource::do_fast_poll()
{
files_read = 0;
max_read = 32;
gather_from_dir(path);
}
/*************************************************
* FTW Slow Poll *
*************************************************/
void FTW_EntropySource::do_slow_poll()
{
files_read = 0;
max_read = 256;
gather_from_dir(path);
}
/*************************************************
* Gather Entropy From Directory Tree *
*************************************************/
void FTW_EntropySource::gather_from_dir(const std::string& dirname)
{
if(dirname == "" || files_read >= max_read)
return;
DIR* dir = ::opendir(dirname.c_str());
if(dir == 0)
return;
std::vector<std::string> subdirs;
dirent* entry = ::readdir(dir);
while(entry && (files_read < max_read))
{
if((std::strcmp(entry->d_name, ".") == 0) ||
(std::strcmp(entry->d_name, "..") == 0))
{ entry = ::readdir(dir); continue; }
const std::string filename = dirname + '/' + entry->d_name;
struct ::stat stat_buf;
if(::lstat(filename.c_str(), &stat_buf) == -1)
{ entry = ::readdir(dir); continue; }
if(S_ISREG(stat_buf.st_mode))
gather_from_file(filename);
else if(S_ISDIR(stat_buf.st_mode))
subdirs.push_back(filename);
entry = ::readdir(dir);
}
::closedir(dir);
for(u32bit j = 0; j != subdirs.size(); j++)
gather_from_dir(subdirs[j]);
}
/*************************************************
* Gather Entropy From A File *
*************************************************/
void FTW_EntropySource::gather_from_file(const std::string& filename)
{
int fd = ::open(filename.c_str(), O_RDONLY | O_NOCTTY);
if(fd == -1)
return;
SecureVector<byte> read_buf(1024);
ssize_t got = ::read(fd, read_buf.begin(), read_buf.size());
::close(fd);
if(got > 0)
{
add_bytes(read_buf, got);
files_read++;
}
}
}
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