/* 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). * */#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. */#if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_VOS)int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)	{	return(-1);	}int RAND_egd(const char *path)	{	return(-1);	}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#elsestruct	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)#endifint 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