Use poll() when possible to gather Unix randomness entropy

 Changes between 0.9.7j and 0.9.7k  [xx XXX xxxx]

  *) Change the Unix randomness entropy gathering to use poll() when

     possible instead of select(), since the latter has some

     undesirable limitations.

     [Darryl Miles via Richard Levitte]

  *) Disable rogue ciphersuites:

      - SSLv2 0x08 0x00 0x80 ("RC4-64-MD5")

#include <unistd.h>

#include <time.h>

#if defined(OPENSSL_SYS_LINUX)

 /* lets use poll() */

# include <sys/poll.h>

# define IOWAIT_VARS		struct pollfd pset; struct timeval t

# define IOWAIT_INIT(f, t)	do {					\

					pset.fd = (f);			\

					pset.events = POLLIN;		\

					pset.revents = 0;		\

					(t)->tv_sec = 0;		\

					(t)->tv_usec = 10*1000;		\

					/* Spend 10ms on each file. */	\

				} while(0)

# define IOWAIT_FUNC(f, t)	poll(&pset, 1, ((t)->tv_sec * 1000) + ((t)->tv_usec / 1000))

# define IOWAIT_CHECK(f)	((pset.revents & POLLIN) != 0)

#else

 /* lets use select() */

 /* For each platform we could do with making a guess at

  *  how many FDs we support.  With glibc/Linux its possible

  *  to use FD_SETSIZE directly, but this may not be very

  *  portable. Another options was to use _POSIX_OPEN_MAX

  *  but that value is a tad dull on modern hardware.  So

  *  I ended up trying sizeof(fd_set)*8 which should be

  *  closer to the real value.

  * If this causes a problem on your platform because we

  *  can not guess correctly then set it to zero.

  */

# if defined(FD_SETSIZE)

#  define IOWAIT_FD_SETSIZE	(FD_SETSIZE)

# else

  /* fallback method */

#  define IOWAIT_FD_SETSIZE	(sizeof(fd_set) * 8)

# endif

# define IOWAIT_VARS		fd_set fset; struct timeval t

# define IOWAIT_INIT(f, t)	do {					\

					FD_ZERO(&fset);			\

					if(IOWAIT_FD_SETSIZE > 0	\

					   && (f) >= IOWAIT_FD_SETSIZE)	\

						{ break; }		\

					FD_SET((f), &fset);		\

					(t)->tv_sec = 0;		\

					(t)->tv_usec = 10*1000;		\

					/* Spend 10ms on each file. */	\

				} while(0)

# define IOWAIT_FUNC(f, t)	select((f)+1,&fset,NULL,NULL,(t))

# define IOWAIT_CHECK(f)	FD_ISSET((f), &fset)

#endif

#ifdef __OpenBSD__

int RAND_poll(void)

{

#endif

			)) >= 0)

			{

			struct timeval t = { 0, 10*1000 }; /* Spend 10ms on

							      each file. */

			int r,j;

			fd_set fset;

			IOWAIT_VARS;

			struct stat *st=&randomstats[i];

			/* Avoid using same input... Used to be O_NOFOLLOW

			do

				{

				FD_ZERO(&fset);

				FD_SET(fd, &fset);

				r = -1;

				IOWAIT_INIT(fd, &t);

				if (select(fd+1,&fset,NULL,NULL,&t) < 0)

				if (IOWAIT_FUNC(fd, &t) < 0)

					t.tv_usec=0;

				else if (FD_ISSET(fd, &fset))

				else if (IOWAIT_CHECK(fd))

					{

					r=read(fd,(unsigned char *)tmpbuf+n,

					       ENTROPY_NEEDED-n);