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129 lines
2.8 KiB
C
129 lines
2.8 KiB
C
/*
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* random.c
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* Random functions.
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*
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* Copyright (c) 2001 Marko Kreen
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: random.c,v 1.6 2003/03/10 22:28:17 tgl Exp $
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*/
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#include <postgres.h>
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#include "px.h"
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#ifdef RAND_DEV
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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static int
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safe_read(int fd, void *buf, size_t count)
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{
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int done = 0;
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char *p = buf;
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int res;
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while (count)
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{
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res = read(fd, p, count);
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if (res <= 0)
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{
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if (errno == EINTR)
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continue;
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return -1;
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}
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p += res;
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done += res;
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count -= res;
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}
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return done;
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}
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int
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px_get_random_bytes(uint8 *dst, unsigned count)
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{
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int fd;
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int res;
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fd = open(RAND_DEV, O_RDONLY);
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if (fd == -1)
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return -1;
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res = safe_read(fd, dst, count);
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close(fd);
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return res;
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}
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#endif /* RAND_DEV */
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#ifdef RAND_SILLY
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int
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px_get_random_bytes(uint8 *dst, unsigned count)
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{
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int i;
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for (i = 0; i < count; i++)
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*dst++ = random();
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return i;
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}
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#endif /* RAND_SILLY */
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#ifdef RAND_OPENSSL
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#include <openssl/evp.h>
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#include <openssl/blowfish.h>
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#include <openssl/rand.h>
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#include <openssl/err.h>
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static int openssl_random_init = 0;
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int
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px_get_random_bytes(uint8 *dst, unsigned count)
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{
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int res;
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if (!openssl_random_init)
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{
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if (RAND_get_rand_method() == NULL)
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RAND_set_rand_method(RAND_SSLeay());
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openssl_random_init = 1;
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}
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/*
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* OpenSSL random should re-feeded occasionally. From /dev/urandom
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* preferably.
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*/
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res = RAND_bytes(dst, count);
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if (res > 0)
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return count;
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return -1;
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}
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#endif /* RAND_OPENSSL */
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