[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/rand.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(VMS) || defined(__VMS)
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
#include <sys/un.h>
#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);
	strcpy(addr.sun_path,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)
		    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)
		    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
	57	#include <openssl/rand.h>
	58
a8ebe469 LJ	59	/*
	60	* Query the EGD <URL: http://www.lothar.com/tech/crypto/>.
	61	*
	62	* This module supplies three routines:
	63	*
	64	* RAND_query_egd_bytes(path, buf, bytes)
	65	* will actually query "bytes" bytes of entropy form the egd-socket located
	66	* at path and will write them to buf (if supplied) or will directly feed
	67	* it to RAND_seed() if buf==NULL.
	68	* The number of bytes is not limited by the maximum chunk size of EGD,
	69	* which is 255 bytes. If more than 255 bytes are wanted, several chunks
	70	* of entropy bytes are requested. The connection is left open until the
	71	* query is competed.
	72	* RAND_query_egd_bytes() returns with
	73	* -1 if an error occured during connection or communication.
	74	* num the number of bytes read from the EGD socket. This number is either
	75	* the number of bytes requested or smaller, if the EGD pool is
	76	* drained and the daemon signals that the pool is empty.
	77	* This routine does not touch any RAND_status(). This is necessary, since
	78	* PRNG functions may call it during initialization.
	79	*
	80	* RAND_egd_bytes(path, bytes) will query "bytes" bytes and have them
	81	* used to seed the PRNG.
	82	* RAND_egd_bytes() is a wrapper for RAND_query_egd_bytes() with buf=NULL.
	83	* Unlike RAND_query_egd_bytes(), RAND_status() is used to test the
	84	* seed status so that the return value can reflect the seed state:
	85	* -1 if an error occured during connection or communication _or_
	86	* if the PRNG has still not received the required seeding.
	87	* num the number of bytes read from the EGD socket. This number is either
	88	* the number of bytes requested or smaller, if the EGD pool is
	89	* drained and the daemon signals that the pool is empty.
	90	*
	91	* RAND_egd(path) will query 255 bytes and use the bytes retreived to seed
	92	* the PRNG.
	93	* RAND_egd() is a wrapper for RAND_egd_bytes() with numbytes=255.
4ec2d4d2 UM	94	*/
4ec2d4d2 UM	95
bc36ee62	96	#if defined(OPENSSL_SYS_WIN32) \|\| defined(VMS) \|\| defined(__VMS)
599c0353 LJ	97	int RAND_query_egd_bytes(const char path, unsigned char buf, int bytes)
	98	{
	99	return(-1);
	100	}
4ec2d4d2 UM	101	int RAND_egd(const char *path)
	102	{
	103	return(-1);
	104	}
1921eaad BL	105
	106	int RAND_egd_bytes(const char *path,int bytes)
	107	{
	108	return(-1);
	109	}
4ec2d4d2 UM	110	#else
	111	#include <openssl/opensslconf.h>
	112	#include OPENSSL_UNISTD
	113	#include <sys/types.h>
	114	#include <sys/socket.h>
8bf49ea1	115	#ifndef NO_SYS_UN_H
4ec2d4d2	116	#include <sys/un.h>
8bf49ea1 RL	117	#else
	118	struct sockaddr_un {
	119	short sun_family; /* AF_UNIX */
	120	char sun_path[108]; /* path name (gag) */
	121	};
	122	#endif /* NO_SYS_UN_H */
fd74679a	123	#include <string.h>
a8ebe469	124	#include <errno.h>
4ec2d4d2 UM	125
	126	#ifndef offsetof
	127	# define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
	128	#endif
	129
599c0353	130	int RAND_query_egd_bytes(const char path, unsigned char buf, int bytes)
4ec2d4d2	131	{
599c0353	132	int ret = 0;
4ec2d4d2	133	struct sockaddr_un addr;
a8ebe469	134	int len, num, numbytes;
4ec2d4d2	135	int fd = -1;
a8ebe469 LJ	136	int success;
a8ebe469 LJ	137	unsigned char egdbuf[2], tempbuf[255], *retrievebuf;
4ec2d4d2 UM	138
	139	memset(&addr, 0, sizeof(addr));
	140	addr.sun_family = AF_UNIX;
	141	if (strlen(path) > sizeof(addr.sun_path))
	142	return (-1);
	143	strcpy(addr.sun_path,path);
	144	len = offsetof(struct sockaddr_un, sun_path) + strlen(path);
	145	fd = socket(AF_UNIX, SOCK_STREAM, 0);
	146	if (fd == -1) return (-1);
a8ebe469 LJ	147	success = 0;
	148	while (!success)
	149	{
	150	if (connect(fd, (struct sockaddr *)&addr, len) == 0)
	151	success = 1;
	152	else
	153	{
	154	switch (errno)
	155	{
	156	#ifdef EINTR
	157	case EINTR:
	158	#endif
	159	#ifdef EAGAIN
	160	case EAGAIN:
	161	#endif
	162	#ifdef EINPROGRESS
	163	case EINPROGRESS:
	164	#endif
	165	#ifdef EALREADY
	166	case EALREADY:
	167	#endif
	168	/* No error, try again */
	169	break;
	170	#ifdef EISCONN
	171	case EISCONN:
	172	success = 1;
	173	break;
	174	#endif
	175	default:
	176	goto err; /* failure */
	177	}
	178	}
	179	}
599c0353 LJ	180
	181	while(bytes > 0)
	182	{
	183	egdbuf[0] = 1;
	184	egdbuf[1] = bytes < 255 ? bytes : 255;
a8ebe469 LJ	185	numbytes = 0;
a8ebe469 LJ	186	while (numbytes != 2)
599c0353	187	{
a8ebe469 LJ	188	num = write(fd, egdbuf + numbytes, 2 - numbytes);
	189	if (num >= 0)
	190	numbytes += num;
	191	else
	192	{
	193	switch (errno)
	194	{
	195	#ifdef EINTR
	196	case EINTR:
	197	#endif
	198	#ifdef EAGAIN
	199	case EAGAIN:
	200	#endif
	201	/* No error, try again */
	202	break;
	203	default:
	204	ret = -1;
	205	goto err; /* failure */
	206	}
	207	}
	208	}
	209	numbytes = 0;
	210	while (numbytes != 1)
	211	{
	212	num = read(fd, egdbuf, 1);
	213	if (num >= 0)
	214	numbytes += num;
	215	else
	216	{
	217	switch (errno)
	218	{
	219	#ifdef EINTR
	220	case EINTR:
	221	#endif
	222	#ifdef EAGAIN
	223	case EAGAIN:
	224	#endif
	225	/* No error, try again */
	226	break;
	227	default:
	228	ret = -1;
	229	goto err; /* failure */
	230	}
	231	}
599c0353 LJ	232	}
	233	if(egdbuf[0] == 0)
	234	goto err;
a8ebe469 LJ	235	if (buf)
	236	retrievebuf = buf + ret;
	237	else
	238	retrievebuf = tempbuf;
	239	numbytes = 0;
	240	while (numbytes != egdbuf[0])
599c0353	241	{
a8ebe469 LJ	242	num = read(fd, retrievebuf + numbytes, egdbuf[0] - numbytes);
	243	if (num >= 0)
	244	numbytes += num;
	245	else
	246	{
	247	switch (errno)
	248	{
	249	#ifdef EINTR
	250	case EINTR:
	251	#endif
	252	#ifdef EAGAIN
	253	case EAGAIN:
	254	#endif
	255	/* No error, try again */
	256	break;
	257	default:
	258	ret = -1;
	259	goto err; /* failure */
	260	}
	261	}
599c0353	262	}
a8ebe469 LJ	263	ret += egdbuf[0];
	264	bytes -= egdbuf[0];
	265	if (!buf)
	266	RAND_seed(tempbuf, egdbuf[0]);
599c0353 LJ	267	}
	268	err:
	269	if (fd != -1) close(fd);
	270	return(ret);
	271	}
	272
a8ebe469 LJ	273
a8ebe469 LJ	274	int RAND_egd_bytes(const char *path, int bytes)
599c0353	275	{
9b4dc830	276	int num, ret = 0;
599c0353	277
a8ebe469	278	num = RAND_query_egd_bytes(path, NULL, bytes);
4ec2d4d2	279	if (num < 1) goto err;
4ec2d4d2	280	if (RAND_status() == 1)
a8ebe469	281	ret = num;
4ec2d4d2	282	err:
4ec2d4d2 UM	283	return(ret);
4ec2d4d2 UM	284	}
1921eaad	285
1921eaad	286
a8ebe469 LJ	287	int RAND_egd(const char *path)
	288	{
	289	return (RAND_egd_bytes(path, 255));
1921eaad BL	290	}
	291
	292
4ec2d4d2	293	#endif