[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 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_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
40720ce3	11	* notice, this list of conditions and the following disclaimer.
4ec2d4d2 UM	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
b558c8d5	61	/*-
a8ebe469 LJ	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
	75	* -1 if an error occured during connection or communication.
	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:
	87	* -1 if an error occured during connection or communication _or_
	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
28a80034	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)
599c0353	99	int RAND_query_egd_bytes(const char path, unsigned char buf, int bytes)
40720ce3 MC	100	{
	101	return (-1);
	102	}
	103
4ec2d4d2	104	int RAND_egd(const char *path)
40720ce3 MC	105	{
	106	return (-1);
	107	}
1921eaad	108
40720ce3 MC	109	int RAND_egd_bytes(const char *path, int bytes)
	110	{
	111	return (-1);
	112	}
4ec2d4d2	113	#else
40720ce3 MC	114	# include <openssl/opensslconf.h>
	115	# include OPENSSL_UNISTD
	116	# include <sys/types.h>
	117	# include <sys/socket.h>
	118	# ifndef NO_SYS_UN_H
	119	# ifdef OPENSSL_SYS_VXWORKS
3e83e686	120	# include <streams/un.h>
40720ce3	121	# else
3e83e686	122	# include <sys/un.h>
40720ce3 MC	123	# endif
	124	# else
	125	struct sockaddr_un {
	126	short sun_family; /* AF_UNIX */
	127	char sun_path[108]; /* path name (gag) */
8bf49ea1	128	};
40720ce3 MC	129	# endif /* NO_SYS_UN_H */
	130	# include <string.h>
	131	# include <errno.h>
4ec2d4d2	132
40720ce3	133	# ifndef offsetof
4ec2d4d2	134	# define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
40720ce3	135	# endif
4ec2d4d2	136
599c0353	137	int RAND_query_egd_bytes(const char path, unsigned char buf, int bytes)
40720ce3 MC	138	{
	139	int ret = 0;
	140	struct sockaddr_un addr;
	141	int len, num, numbytes;
	142	int fd = -1;
	143	int success;
	144	unsigned char egdbuf[2], tempbuf[255], *retrievebuf;
4ec2d4d2	145
40720ce3 MC	146	memset(&addr, 0, sizeof(addr));
	147	addr.sun_family = AF_UNIX;
	148	if (strlen(path) >= sizeof(addr.sun_path))
	149	return (-1);
	150	BUF_strlcpy(addr.sun_path, path, sizeof addr.sun_path);
	151	len = offsetof(struct sockaddr_un, sun_path) + strlen(path);
	152	fd = socket(AF_UNIX, SOCK_STREAM, 0);
	153	if (fd == -1)
	154	return (-1);
	155	success = 0;
	156	while (!success) {
	157	if (connect(fd, (struct sockaddr *)&addr, len) == 0)
	158	success = 1;
	159	else {
	160	switch (errno) {
	161	# ifdef EINTR
	162	case EINTR:
	163	# endif
	164	# ifdef EAGAIN
	165	case EAGAIN:
	166	# endif
	167	# ifdef EINPROGRESS
	168	case EINPROGRESS:
	169	# endif
	170	# ifdef EALREADY
	171	case EALREADY:
	172	# endif
	173	/* No error, try again */
	174	break;
	175	# ifdef EISCONN
	176	case EISCONN:
	177	success = 1;
	178	break;
	179	# endif
	180	default:
	181	goto err; /* failure */
	182	}
	183	}
	184	}
599c0353	185
40720ce3 MC	186	while (bytes > 0) {
	187	egdbuf[0] = 1;
	188	egdbuf[1] = bytes < 255 ? bytes : 255;
	189	numbytes = 0;
	190	while (numbytes != 2) {
	191	num = write(fd, egdbuf + numbytes, 2 - numbytes);
	192	if (num >= 0)
	193	numbytes += num;
	194	else {
	195	switch (errno) {
	196	# ifdef EINTR
	197	case EINTR:
	198	# endif
	199	# ifdef EAGAIN
	200	case EAGAIN:
	201	# endif
	202	/* No error, try again */
	203	break;
	204	default:
	205	ret = -1;
	206	goto err; /* failure */
	207	}
	208	}
	209	}
	210	numbytes = 0;
	211	while (numbytes != 1) {
	212	num = read(fd, egdbuf, 1);
	213	if (num == 0)
	214	goto err; /* descriptor closed */
	215	else if (num > 0)
	216	numbytes += num;
	217	else {
	218	switch (errno) {
	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	}
	232	}
	233	if (egdbuf[0] == 0)
	234	goto err;
	235	if (buf)
	236	retrievebuf = buf + ret;
	237	else
	238	retrievebuf = tempbuf;
	239	numbytes = 0;
	240	while (numbytes != egdbuf[0]) {
	241	num = read(fd, retrievebuf + numbytes, egdbuf[0] - numbytes);
	242	if (num == 0)
	243	goto err; /* descriptor closed */
	244	else if (num > 0)
	245	numbytes += num;
	246	else {
	247	switch (errno) {
	248	# ifdef EINTR
	249	case EINTR:
250	# endif
251	# ifdef EAGAIN
252	case EAGAIN:
253	# endif
254	/* No error, try again */
255	break;
256	default:
257	ret = -1;
258	goto err; /* failure */
259	}
260	}
261	}
262	ret += egdbuf[0];
263	bytes -= egdbuf[0];
264	if (!buf)
265	RAND_seed(tempbuf, egdbuf[0]);
266	}
599c0353	267	err:
40720ce3 MC	268	if (fd != -1)
	269	close(fd);
	270	return (ret);
	271	}
a8ebe469 LJ	272
a8ebe469 LJ	273	int RAND_egd_bytes(const char *path, int bytes)
40720ce3 MC	274	{
40720ce3 MC	275	int num, ret = 0;
599c0353	276
40720ce3 MC	277	num = RAND_query_egd_bytes(path, NULL, bytes);
	278	if (num < 1)
	279	goto err;
	280	if (RAND_status() == 1)
	281	ret = num;
4ec2d4d2	282	err:
40720ce3 MC	283	return (ret);
40720ce3 MC	284	}
1921eaad	285
a8ebe469	286	int RAND_egd(const char *path)
40720ce3 MC	287	{
	288	return (RAND_egd_bytes(path, 255));
	289	}
1921eaad	290
4ec2d4d2	291	#endif