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/*************************************************
* EGD EntropySource Source File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#include <botan/es_egd.h>
#include <botan/bit_ops.h>
#include <botan/parsing.h>
#include <botan/exceptn.h>
#include <cstring>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#ifndef PF_LOCAL
#define PF_LOCAL PF_UNIX
#endif
namespace Botan {
/*************************************************
* Gather Entropy from EGD *
*************************************************/
u32bit EGD_EntropySource::do_poll(byte output[], u32bit length,
const std::string& path) const
{
if(length > 128)
length = 128;
sockaddr_un addr;
std::memset(&addr, 0, sizeof(addr));
addr.sun_family = PF_LOCAL;
if(sizeof(addr.sun_path) < path.length() + 1)
throw Exception("EGD_EntropySource: Socket path is too long");
std::strcpy(addr.sun_path, path.c_str());
int fd = ::socket(addr.sun_family, SOCK_STREAM, 0);
if(fd == -1) return 0;
int len = sizeof(addr.sun_family) + std::strlen(addr.sun_path) + 1;
if(::connect(fd, reinterpret_cast<struct ::sockaddr*>(&addr), len))
{ ::close(fd); return 0; }
byte buffer[2];
buffer[0] = 1;
buffer[1] = static_cast<byte>(length);
if(::write(fd, buffer, 2) != 2) { ::close(fd); return 0; }
if(::read(fd, buffer, 1) != 1) { ::close(fd); return 0; }
ssize_t count = ::read(fd, output, buffer[0]);
if(count == -1) { close(fd); return 0; }
::close(fd);
return count;
}
/*************************************************
* Gather Entropy from EGD *
*************************************************/
u32bit EGD_EntropySource::slow_poll(byte output[], u32bit length)
{
for(u32bit j = 0; j != paths.size(); j++)
{
u32bit got = do_poll(output, length, paths[j]);
if(got)
return got;
}
return 0;
}
/**
* Gather Entropy from EGD, limiting to 64 bytes
*/
u32bit EGD_EntropySource::fast_poll(byte output[], u32bit length)
{
return slow_poll(output, std::min<u32bit>(length, 64));
}
}
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