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237 lines
8.4 KiB
C
237 lines
8.4 KiB
C
/* crypto/rand/rand_unix.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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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 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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/* ====================================================================
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* Copyright (c) 1998-2000 The OpenSSL Project. 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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*
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include "cryptlib.h"
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#include <openssl/rand.h>
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#include "rand_lcl.h"
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#if !(defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_OS2))
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/times.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <time.h>
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int RAND_poll(void)
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{
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unsigned long l;
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pid_t curr_pid = getpid();
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#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
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unsigned char tmpbuf[ENTROPY_NEEDED];
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int n = 0;
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#endif
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#ifdef DEVRANDOM
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static const char *randomfiles[] = { DEVRANDOM, NULL };
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const char **randomfile = NULL;
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int fd;
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#endif
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#ifdef DEVRANDOM_EGD
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static const char *egdsockets[] = { DEVRANDOM_EGD, NULL };
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const char **egdsocket = NULL;
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#endif
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#ifdef DEVRANDOM
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/* Use a random entropy pool device. Linux, FreeBSD and OpenBSD
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* have this. Use /dev/urandom if you can as /dev/random may block
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* if it runs out of random entries. */
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for (randomfile = randomfiles; *randomfile && n < ENTROPY_NEEDED; randomfile++)
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{
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if ((fd = open(*randomfile, O_RDONLY|O_NONBLOCK
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#ifdef O_NOCTTY /* If it happens to be a TTY (god forbid), do not make it
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our controlling tty */
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|O_NOCTTY
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#endif
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#ifdef O_NOFOLLOW /* Fail if the file is a symbolic link */
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|O_NOFOLLOW
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#endif
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)) >= 0)
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{
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struct timeval t = { 0, 10*1000 }; /* Spend 10ms on
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each file. */
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int r;
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fd_set fset;
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do
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{
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FD_ZERO(&fset);
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FD_SET(fd, &fset);
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r = -1;
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if (select(fd+1,&fset,NULL,NULL,&t) < 0)
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t.tv_usec=0;
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else if (FD_ISSET(fd, &fset))
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{
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r=read(fd,(unsigned char *)tmpbuf+n,
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ENTROPY_NEEDED-n);
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if (r > 0)
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n += r;
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}
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/* Some Unixen will update t, some
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won't. For those who won't, give
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up here, otherwise, we will do
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this once again for the remaining
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time. */
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if (t.tv_usec == 10*1000)
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t.tv_usec=0;
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}
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while ((r > 0 || (errno == EINTR || errno == EAGAIN))
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&& t.tv_usec != 0 && n < ENTROPY_NEEDED);
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close(fd);
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}
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}
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#endif
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#ifdef DEVRANDOM_EGD
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/* Use an EGD socket to read entropy from an EGD or PRNGD entropy
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* collecting daemon. */
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for (egdsocket = egdsockets; *egdsocket && n < ENTROPY_NEEDED; egdsocket++)
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{
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int r;
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r = RAND_query_egd_bytes(*egdsocket, (unsigned char *)tmpbuf+n,
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ENTROPY_NEEDED-n);
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if (r > 0)
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n += r;
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}
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#endif
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#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
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if (n > 0)
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{
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RAND_add(tmpbuf,sizeof tmpbuf,n);
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memset(tmpbuf,0,n);
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}
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#endif
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/* put in some default random data, we need more than just this */
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l=curr_pid;
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RAND_add(&l,sizeof(l),0);
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l=getuid();
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RAND_add(&l,sizeof(l),0);
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l=time(NULL);
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RAND_add(&l,sizeof(l),0);
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#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
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return 1;
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#else
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return 0;
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#endif
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}
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#endif
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