/* crypto/rand/rand_egd.c */

/* Written by Ulf Moeller and Lutz Jaenicke for the OpenSSL project. */

/* ====================================================================

 * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer. 

 *

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in

 *    the documentation and/or other materials provided with the

 *    distribution.

 *

 * 3. All advertising materials mentioning features or use of this

 *    software must display the following acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"

 *

 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

 *    endorse or promote products derived from this software without

 *    prior written permission. For written permission, please contact

 *    openssl-core@openssl.org.

 *

 * 5. Products derived from this software may not be called "OpenSSL"

 *    nor may "OpenSSL" appear in their names without prior written

 *    permission of the OpenSSL Project.

 *

 * 6. Redistributions of any form whatsoever must retain the following

 *    acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"

 *

 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR

 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

 * OF THE POSSIBILITY OF SUCH DAMAGE.

 * ====================================================================

 *

 * This product includes cryptographic software written by Eric Young

 * (eay@cryptsoft.com).  This product includes software written by Tim

 * Hudson (tjh@cryptsoft.com).

 *

 */

/*

 © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 */

#include <openssl/e_os2.h>

#include <openssl/rand.h>

#include <openssl/buffer.h>

/*

 * Query the EGD <URL: http://www.lothar.com/tech/crypto/>.

 *

 * This module supplies three routines:

 *

 * RAND_query_egd_bytes(path, buf, bytes)

 *   will actually query "bytes" bytes of entropy form the egd-socket located

 *   at path and will write them to buf (if supplied) or will directly feed

 *   it to RAND_seed() if buf==NULL.

 *   The number of bytes is not limited by the maximum chunk size of EGD,

 *   which is 255 bytes. If more than 255 bytes are wanted, several chunks

 *   of entropy bytes are requested. The connection is left open until the

 *   query is competed.

 *   RAND_query_egd_bytes() returns with

 *     -1  if an error occured during connection or communication.

 *     num the number of bytes read from the EGD socket. This number is either

 *         the number of bytes requested or smaller, if the EGD pool is

 *         drained and the daemon signals that the pool is empty.

 *   This routine does not touch any RAND_status(). This is necessary, since

 *   PRNG functions may call it during initialization.

 *

 * RAND_egd_bytes(path, bytes) will query "bytes" bytes and have them

 *   used to seed the PRNG.

 *   RAND_egd_bytes() is a wrapper for RAND_query_egd_bytes() with buf=NULL.

 *   Unlike RAND_query_egd_bytes(), RAND_status() is used to test the

 *   seed status so that the return value can reflect the seed state:

 *     -1  if an error occured during connection or communication _or_

 *         if the PRNG has still not received the required seeding.

 *     num the number of bytes read from the EGD socket. This number is either

 *         the number of bytes requested or smaller, if the EGD pool is

 *         drained and the daemon signals that the pool is empty.

 *

 * RAND_egd(path) will query 255 bytes and use the bytes retreived to seed

 *   the PRNG.

 *   RAND_egd() is a wrapper for RAND_egd_bytes() with numbytes=255.

 */

/*

 © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 */

#if defined(SYMBIAN)||defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_NETWARE) || defined(OPENSSL_SYS_VOS)

EXPORT_C int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)

	{

	return(-1);

	}

EXPORT_C int RAND_egd(const char *path)

	{

	return(-1);

	}

EXPORT_C int RAND_egd_bytes(const char *path,int bytes)

	{

	return(-1);

	}

#else

#include <openssl/opensslconf.h>

#include OPENSSL_UNISTD

#include <sys/types.h>

#include <sys/socket.h>

#ifndef NO_SYS_UN_H

# ifdef OPENSSL_SYS_VXWORKS

#   include <streams/un.h>

# else

#   include <sys/un.h>

# endif

#else

struct	sockaddr_un {

	short	sun_family;		/* AF_UNIX */

	char	sun_path[108];		/* path name (gag) */

};

#endif /* NO_SYS_UN_H */

#include <string.h>

#include <errno.h>

#ifndef offsetof

#  define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)

#endif

int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)

	{

	int ret = 0;

	struct sockaddr_un addr;

	int len, num, numbytes;

	int fd = -1;

	int success;

	unsigned char egdbuf[2], tempbuf[255], *retrievebuf;

	memset(&addr, 0, sizeof(addr));

	addr.sun_family = AF_UNIX;

	if (strlen(path) >= sizeof(addr.sun_path))

		return (-1);

	BUF_strlcpy(addr.sun_path,path,sizeof addr.sun_path);

	len = offsetof(struct sockaddr_un, sun_path) + strlen(path);

	fd = socket(AF_UNIX, SOCK_STREAM, 0);

	if (fd == -1) return (-1);

	success = 0;

	while (!success)

	    {

	    if (connect(fd, (struct sockaddr *)&addr, len) == 0)

	       success = 1;

	    else

		{

		switch (errno)

		    {

#ifdef EINTR

		    case EINTR:

#endif

#ifdef EAGAIN

		    case EAGAIN:

#endif

#ifdef EINPROGRESS

		    case EINPROGRESS:

#endif

#ifdef EALREADY

		    case EALREADY:

#endif

			/* No error, try again */

			break;

#ifdef EISCONN

		    case EISCONN:

			success = 1;

			break;

#endif

		    default:

			goto err;	/* failure */

		    }

		}

	    }

	while(bytes > 0)

	    {

	    egdbuf[0] = 1;

	    egdbuf[1] = bytes < 255 ? bytes : 255;

	    numbytes = 0;

	    while (numbytes != 2)

		{

	        num = write(fd, egdbuf + numbytes, 2 - numbytes);

	        if (num >= 0)

		    numbytes += num;

	    	else

		    {

		    switch (errno)

		    	{

#ifdef EINTR

		    	case EINTR:

#endif

#ifdef EAGAIN

		    	case EAGAIN:

#endif

			    /* No error, try again */

			    break;

		    	default:

			    ret = -1;

			    goto err;	/* failure */

			}

		    }

		}

	    numbytes = 0;

	    while (numbytes != 1)

		{

	        num = read(fd, egdbuf, 1);

	        if (num == 0)

			goto err;	/* descriptor closed */

		else if (num > 0)

		    numbytes += num;

	    	else

		    {

		    switch (errno)

		    	{

#ifdef EINTR

		    	case EINTR:

#endif

#ifdef EAGAIN

		    	case EAGAIN:

#endif

			    /* No error, try again */

			    break;

		    	default:

			    ret = -1;

			    goto err;	/* failure */

			}

		    }

		}

	    if(egdbuf[0] == 0)

		goto err;

	    if (buf)

		retrievebuf = buf + ret;

	    else

		retrievebuf = tempbuf;

	    numbytes = 0;

	    while (numbytes != egdbuf[0])

		{

	        num = read(fd, retrievebuf + numbytes, egdbuf[0] - numbytes);

		if (num == 0)

			goto err;	/* descriptor closed */

	        else if (num > 0)

		    numbytes += num;

	    	else

		    {

		    switch (errno)

		    	{

#ifdef EINTR

		    	case EINTR:

#endif

#ifdef EAGAIN

		    	case EAGAIN:

#endif

			    /* No error, try again */

			    break;

		    	default:

			    ret = -1;

			    goto err;	/* failure */

			}

		    }

		}

	    ret += egdbuf[0];

	    bytes -= egdbuf[0];

	    if (!buf)

		RAND_seed(tempbuf, egdbuf[0]);

	    }

 err:

	if (fd != -1) close(fd);

	return(ret);

	}

int RAND_egd_bytes(const char *path, int bytes)

	{

	int num, ret = 0;

	num = RAND_query_egd_bytes(path, NULL, bytes);

	if (num < 1) goto err;

	if (RAND_status() == 1)

	    ret = num;

 err:

	return(ret);

	}

int RAND_egd(const char *path)

	{

	return (RAND_egd_bytes(path, 255));

	}

#endif