/* Full initialization of this module. */
static void
initialize(void)
{
/* Although the basic initialization should have happened already,
we call it here to make sure that all prerequisites are met. */
initialize_basics ();
/* Now we can look the pool and complete the initialization if
necessary. */
lock_pool ();
if (!rndpool)
{
/* The data buffer is allocated somewhat larger, so that we can
use this extra space (which is allocated in secure memory) as
a temporary hash buffer */
rndpool = (secure_alloc
? xcalloc_secure (1, POOLSIZE + BLOCKLEN)
: xcalloc (1, POOLSIZE + BLOCKLEN));
keypool = (secure_alloc
? xcalloc_secure (1, POOLSIZE + BLOCKLEN)
: xcalloc (1, POOLSIZE + BLOCKLEN));
/* Setup the slow entropy gathering function. The code requires
that this function exists. */
slow_gather_fnc = getfnc_gather_random ();
/* Setup the fast entropy gathering function. */
fast_gather_fnc = getfnc_fast_random_poll ();
}
unlock_pool ();
}
static void
do_fast_random_poll (void)
{
static void (*fnc)( void (*)(const void*, size_t, int), int) = NULL;
static int initialized = 0;
assert (pool_is_locked);
rndstats.fastpolls++;
if (!initialized )
{
if (!is_initialized )
initialize();
initialized = 1;
fnc = getfnc_fast_random_poll ();
}
if (fnc)
(*fnc)( add_randomness, 1 );
/* Continue with the generic functions. */
#if HAVE_GETHRTIME
{
hrtime_t tv;
tv = gethrtime();
add_randomness( &tv, sizeof(tv), 1 );
}
#elif HAVE_GETTIMEOFDAY
{
struct timeval tv;
if( gettimeofday( &tv, NULL ) )
BUG();
add_randomness( &tv.tv_sec, sizeof(tv.tv_sec), 1 );
add_randomness( &tv.tv_usec, sizeof(tv.tv_usec), 1 );
}
#elif HAVE_CLOCK_GETTIME
{ struct timespec tv;
if( clock_gettime( CLOCK_REALTIME, &tv ) == -1 )
BUG();
add_randomness( &tv.tv_sec, sizeof(tv.tv_sec), 1 );
add_randomness( &tv.tv_nsec, sizeof(tv.tv_nsec), 1 );
}
#else /* use times */
# ifndef HAVE_DOSISH_SYSTEM
{ struct tms buf;
times( &buf );
add_randomness( &buf, sizeof buf, 1 );
}
# endif
#endif
#ifdef HAVE_GETRUSAGE
# ifdef RUSAGE_SELF
{
struct rusage buf;
/* QNX/Neutrino does return ENOSYS - so we just ignore it and
* add whatever is in buf. In a chroot environment it might not
* work at all (i.e. because /proc/ is not accessible), so we better
* ugnore all error codes and hope for the best
*/
getrusage (RUSAGE_SELF, &buf );
add_randomness( &buf, sizeof buf, 1 );
memset( &buf, 0, sizeof buf );
}
# else /*!RUSAGE_SELF*/
# ifdef __GCC__
# warning There is no RUSAGE_SELF on this system
# endif
# endif /*!RUSAGE_SELF*/
#endif /*HAVE_GETRUSAGE*/
/* time and clock are availabe on all systems - so we better do it
just in case one of the above functions didn't work */
{
time_t x = time(NULL);
add_randomness( &x, sizeof(x), 1 );
}
{
clock_t x = clock();
add_randomness( &x, sizeof(x), 1 );
}
}
void
fast_random_poll()
{
static void (*fnc)( void (*)(const void*, size_t, int), int) = NULL;
static int initialized = 0;
rndstats.fastpolls++;
if( !initialized ) {
if( !is_initialized )
initialize();
initialized = 1;
fnc = getfnc_fast_random_poll();
}
if( fnc ) {
(*fnc)( add_randomness, 1 );
return;
}
/* fall back to the generic function */
#if defined(HAVE_GETHRTIME) && !defined(HAVE_BROKEN_GETHRTIME)
{ hrtime_t tv;
/* On some Solaris and HPUX system gethrtime raises an SIGILL, but we
* checked this with configure */
tv = gethrtime();
add_randomness( &tv, sizeof(tv), 1 );
}
#elif defined (HAVE_GETTIMEOFDAY)
{ struct timeval tv;
if( gettimeofday( &tv, NULL ) )
BUG();
add_randomness( &tv.tv_sec, sizeof(tv.tv_sec), 1 );
add_randomness( &tv.tv_usec, sizeof(tv.tv_usec), 1 );
}
#elif defined (HAVE_CLOCK_GETTIME)
{ struct timespec tv;
if( clock_gettime( CLOCK_REALTIME, &tv ) == -1 )
BUG();
add_randomness( &tv.tv_sec, sizeof(tv.tv_sec), 1 );
add_randomness( &tv.tv_nsec, sizeof(tv.tv_nsec), 1 );
}
#else /* use times */
#ifndef HAVE_DOSISH_SYSTEM
{ struct tms buf;
times( &buf );
add_randomness( &buf, sizeof buf, 1 );
}
#endif
#endif
#ifdef HAVE_GETRUSAGE
#ifndef RUSAGE_SELF
#ifdef __GCC__
#warning There is no RUSAGE_SELF on this system
#endif
#else
{ struct rusage buf;
/* QNX/Neutrino does return ENOSYS - so we just ignore it and
* add whatever is in buf. In a chroot environment it might not
* work at all (i.e. because /proc/ is not accessible), so we better
* ignore all error codes and hope for the best
*/
getrusage( RUSAGE_SELF, &buf );
add_randomness( &buf, sizeof buf, 1 );
memset( &buf, 0, sizeof buf );
}
#endif
#endif
/* time and clock are available on all systems - so
* we better do it just in case one of the above functions
* didn't work */
{ time_t x = time(NULL);
add_randomness( &x, sizeof(x), 1 );
}
{ clock_t x = clock();
add_randomness( &x, sizeof(x), 1 );
}
}
