[thirdparty/openssl.git] / crypto / rand / rand_egd.c

/* 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 occurred 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 occurred 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_NETWARE) || 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
#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
Commit	Line	Data
4ec2d4d2	1	/* crypto/rand/rand_egd.c */
a8ebe469	2	/* Written by Ulf Moeller and Lutz Jaenicke for the OpenSSL project. */
4ec2d4d2 UM	3	/* ====================================================================
	4	* Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	*
	10	* 1. Redistributions of source code must retain the above copyright
	11	* notice, this list of conditions and the following disclaimer.
	12	*
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in
	15	* the documentation and/or other materials provided with the
	16	* distribution.
	17	*
	18	* 3. All advertising materials mentioning features or use of this
	19	* software must display the following acknowledgment:
	20	* "This product includes software developed by the OpenSSL Project
	21	* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
	22	*
	23	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	24	* endorse or promote products derived from this software without
	25	* prior written permission. For written permission, please contact
	26	* openssl-core@openssl.org.
	27	*
	28	* 5. Products derived from this software may not be called "OpenSSL"
	29	* nor may "OpenSSL" appear in their names without prior written
	30	* permission of the OpenSSL Project.
	31	*
	32	* 6. Redistributions of any form whatsoever must retain the following
	33	* acknowledgment:
	34	* "This product includes software developed by the OpenSSL Project
	35	* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
	36	*
	37	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	38	* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	39	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	40	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
	41	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	42	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	43	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	44	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	45	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	46	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	47	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
	48	* OF THE POSSIBILITY OF SUCH DAMAGE.
	49	* ====================================================================
	50	*
	51	* This product includes cryptographic software written by Eric Young
	52	* (eay@cryptsoft.com). This product includes software written by Tim
	53	* Hudson (tjh@cryptsoft.com).
	54	*
	55	*/
	56
a95d2c51	57	#include <openssl/e_os2.h>
4ec2d4d2	58	#include <openssl/rand.h>
d420ac2c	59	#include <openssl/buffer.h>
4ec2d4d2	60
a8ebe469 LJ	61	/*
	62	* Query the EGD <URL: http://www.lothar.com/tech/crypto/>.
	63	*
	64	* This module supplies three routines:
	65	*
	66	* RAND_query_egd_bytes(path, buf, bytes)
	67	* will actually query "bytes" bytes of entropy form the egd-socket located
	68	* at path and will write them to buf (if supplied) or will directly feed
	69	* it to RAND_seed() if buf==NULL.
	70	* The number of bytes is not limited by the maximum chunk size of EGD,
	71	* which is 255 bytes. If more than 255 bytes are wanted, several chunks
	72	* of entropy bytes are requested. The connection is left open until the
	73	* query is competed.
	74	* RAND_query_egd_bytes() returns with
478b50cf	75	* -1 if an error occurred during connection or communication.
a8ebe469 LJ	76	* num the number of bytes read from the EGD socket. This number is either
	77	* the number of bytes requested or smaller, if the EGD pool is
	78	* drained and the daemon signals that the pool is empty.
	79	* This routine does not touch any RAND_status(). This is necessary, since
	80	* PRNG functions may call it during initialization.
	81	*
	82	* RAND_egd_bytes(path, bytes) will query "bytes" bytes and have them
	83	* used to seed the PRNG.
	84	* RAND_egd_bytes() is a wrapper for RAND_query_egd_bytes() with buf=NULL.
	85	* Unlike RAND_query_egd_bytes(), RAND_status() is used to test the
	86	* seed status so that the return value can reflect the seed state:
478b50cf	87	* -1 if an error occurred during connection or communication _or_
a8ebe469 LJ	88	* if the PRNG has still not received the required seeding.
	89	* num the number of bytes read from the EGD socket. This number is either
	90	* the number of bytes requested or smaller, if the EGD pool is
	91	* drained and the daemon signals that the pool is empty.
	92	*
	93	* RAND_egd(path) will query 255 bytes and use the bytes retreived to seed
	94	* the PRNG.
	95	* RAND_egd() is a wrapper for RAND_egd_bytes() with numbytes=255.
4ec2d4d2 UM	96	*/
4ec2d4d2 UM	97
b317819b	98	#if defined(OPENSSL_SYS_WIN32) \|\| defined(OPENSSL_SYS_VMS) \|\| defined(OPENSSL_SYS_MSDOS) \|\| defined(OPENSSL_SYS_VXWORKS) \|\| defined(OPENSSL_SYS_NETWARE) \|\| defined(OPENSSL_SYS_VOS)
2fbc8a2a	99	int RAND_query_egd_bytes(const char path, unsigned char buf, int bytes)
599c0353 LJ	100	{
	101	return(-1);
	102	}
4ec2d4d2 UM	103	int RAND_egd(const char *path)
	104	{
	105	return(-1);
	106	}
1921eaad	107
2fbc8a2a	108	int RAND_egd_bytes(const char *path,int bytes)
1921eaad BL	109	{
	110	return(-1);
	111	}
4ec2d4d2 UM	112	#else
	113	#include <openssl/opensslconf.h>
	114	#include OPENSSL_UNISTD
	115	#include <sys/types.h>
	116	#include <sys/socket.h>
8bf49ea1	117	#ifndef NO_SYS_UN_H
6a89a25c	118	# ifdef OPENSSL_SYS_VXWORKS
3e83e686 RL	119	# include <streams/un.h>
	120	# else
	121	# include <sys/un.h>
	122	# endif
8bf49ea1 RL	123	#else
	124	struct sockaddr_un {
	125	short sun_family; /* AF_UNIX */
	126	char sun_path[108]; /* path name (gag) */
	127	};
	128	#endif /* NO_SYS_UN_H */
fd74679a	129	#include <string.h>
a8ebe469	130	#include <errno.h>
4ec2d4d2 UM	131
	132	#ifndef offsetof
	133	# define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
	134	#endif
	135
6343829a	136	int RAND_query_egd_bytes(const char path, unsigned char buf, int bytes)
4ec2d4d2	137	{
599c0353	138	int ret = 0;
4ec2d4d2	139	struct sockaddr_un addr;
6343829a	140	int len, num, numbytes;
4ec2d4d2	141	int fd = -1;
a8ebe469 LJ	142	int success;
a8ebe469 LJ	143	unsigned char egdbuf[2], tempbuf[255], *retrievebuf;
4ec2d4d2 UM	144
	145	memset(&addr, 0, sizeof(addr));
	146	addr.sun_family = AF_UNIX;
54a656ef	147	if (strlen(path) >= sizeof(addr.sun_path))
4ec2d4d2	148	return (-1);
d420ac2c	149	BUF_strlcpy(addr.sun_path,path,sizeof addr.sun_path);
4ec2d4d2 UM	150	len = offsetof(struct sockaddr_un, sun_path) + strlen(path);
	151	fd = socket(AF_UNIX, SOCK_STREAM, 0);
	152	if (fd == -1) return (-1);
a8ebe469 LJ	153	success = 0;
	154	while (!success)
	155	{
	156	if (connect(fd, (struct sockaddr *)&addr, len) == 0)
	157	success = 1;
	158	else
	159	{
	160	switch (errno)
	161	{
	162	#ifdef EINTR
	163	case EINTR:
	164	#endif
	165	#ifdef EAGAIN
	166	case EAGAIN:
	167	#endif
	168	#ifdef EINPROGRESS
	169	case EINPROGRESS:
	170	#endif
	171	#ifdef EALREADY
	172	case EALREADY:
	173	#endif
	174	/* No error, try again */
	175	break;
	176	#ifdef EISCONN
	177	case EISCONN:
	178	success = 1;
	179	break;
	180	#endif
	181	default:
	182	goto err; /* failure */
	183	}
	184	}
	185	}
599c0353 LJ	186
	187	while(bytes > 0)
	188	{
	189	egdbuf[0] = 1;
	190	egdbuf[1] = bytes < 255 ? bytes : 255;
a8ebe469 LJ	191	numbytes = 0;
a8ebe469 LJ	192	while (numbytes != 2)
599c0353	193	{
a8ebe469 LJ	194	num = write(fd, egdbuf + numbytes, 2 - numbytes);
	195	if (num >= 0)
	196	numbytes += num;
	197	else
	198	{
	199	switch (errno)
	200	{
	201	#ifdef EINTR
	202	case EINTR:
	203	#endif
	204	#ifdef EAGAIN
	205	case EAGAIN:
	206	#endif
	207	/* No error, try again */
	208	break;
	209	default:
	210	ret = -1;
	211	goto err; /* failure */
	212	}
	213	}
	214	}
	215	numbytes = 0;
	216	while (numbytes != 1)
	217	{
	218	num = read(fd, egdbuf, 1);
f69a8aeb LJ	219	if (num == 0)
	220	goto err; /* descriptor closed */
	221	else if (num > 0)
a8ebe469 LJ	222	numbytes += num;
	223	else
	224	{
	225	switch (errno)
	226	{
	227	#ifdef EINTR
	228	case EINTR:
	229	#endif
	230	#ifdef EAGAIN
	231	case EAGAIN:
	232	#endif
	233	/* No error, try again */
	234	break;
	235	default:
	236	ret = -1;
	237	goto err; /* failure */
	238	}
	239	}
599c0353 LJ	240	}
	241	if(egdbuf[0] == 0)
	242	goto err;
a8ebe469 LJ	243	if (buf)
	244	retrievebuf = buf + ret;
	245	else
	246	retrievebuf = tempbuf;
	247	numbytes = 0;
	248	while (numbytes != egdbuf[0])
599c0353	249	{
a8ebe469	250	num = read(fd, retrievebuf + numbytes, egdbuf[0] - numbytes);
f69a8aeb LJ	251	if (num == 0)
	252	goto err; /* descriptor closed */
	253	else if (num > 0)
a8ebe469 LJ	254	numbytes += num;
	255	else
	256	{
	257	switch (errno)
	258	{
	259	#ifdef EINTR
	260	case EINTR:
	261	#endif
	262	#ifdef EAGAIN
	263	case EAGAIN:
	264	#endif
	265	/* No error, try again */
	266	break;
	267	default:
	268	ret = -1;
	269	goto err; /* failure */
	270	}
	271	}
599c0353	272	}
a8ebe469 LJ	273	ret += egdbuf[0];
	274	bytes -= egdbuf[0];
	275	if (!buf)
	276	RAND_seed(tempbuf, egdbuf[0]);
599c0353 LJ	277	}
	278	err:
	279	if (fd != -1) close(fd);
	280	return(ret);
	281	}
	282
a8ebe469	283
6343829a	284	int RAND_egd_bytes(const char *path, int bytes)
599c0353	285	{
9b4dc830	286	int num, ret = 0;
599c0353	287
a8ebe469	288	num = RAND_query_egd_bytes(path, NULL, bytes);
4ec2d4d2	289	if (num < 1) goto err;
4ec2d4d2	290	if (RAND_status() == 1)
a8ebe469	291	ret = num;
4ec2d4d2	292	err:
4ec2d4d2 UM	293	return(ret);
4ec2d4d2 UM	294	}
1921eaad	295
1921eaad	296
a8ebe469 LJ	297	int RAND_egd(const char *path)
	298	{
	299	return (RAND_egd_bytes(path, 255));
1921eaad BL	300	}
	301
	302
4ec2d4d2	303	#endif