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+/* crypto/rand/rand_unix.c */
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ *
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to. The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code. The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ *
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ *
+ * 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 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 acknowledgement:
+ * "This product includes cryptographic software written by
+ * Eric Young (eay@cryptsoft.com)"
+ * The word 'cryptographic' can be left out if the rouines from the library
+ * being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ * the apps directory (application code) you must include an acknowledgement:
+ * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS 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 AUTHOR OR 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.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed. i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.]
+ */
+/* ====================================================================
+ * 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 "cryptlib.h"
+#include <openssl/rand.h>
+#include "rand_lcl.h"
+
+#if !(defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_OS2))
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/times.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <time.h>
+
+#ifdef __OpenBSD__
+#undef DEVRANDOM
+#define DEVRANDOM "/dev/arandom"
+int RAND_poll(void)
+{
+ unsigned long l;
+ pid_t curr_pid = getpid();
+ FILE *fh;
+
+ /* Use a random entropy pool device. Linux, FreeBSD and OpenBSD
+ * have this. Use /dev/urandom if you can as /dev/random may block
+ * if it runs out of random entries. */
+
+ if ((fh = fopen(DEVRANDOM, "r")) != NULL)
+ {
+ unsigned char tmpbuf[ENTROPY_NEEDED];
+ int n;
+
+ setvbuf(fh, NULL, _IONBF, 0);
+ n=fread((unsigned char *)tmpbuf,1,ENTROPY_NEEDED,fh);
+ fclose(fh);
+ RAND_add(tmpbuf,sizeof tmpbuf,n);
+ memset(tmpbuf,0,n);
+ }
+
+ /* put in some default random data, we need more than just this */
+ l=curr_pid;
+ RAND_add(&l,sizeof(l),0);
+ l=getuid();
+ RAND_add(&l,sizeof(l),0);
+
+ l=time(NULL);
+ RAND_add(&l,sizeof(l),0);
+
+ return 1;
+}
+#else
+int RAND_poll(void)
+{
+ unsigned long l;
+ pid_t curr_pid = getpid();
+#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
+ unsigned char tmpbuf[ENTROPY_NEEDED];
+ int n = 0;
+#endif
+#ifdef DEVRANDOM
+ static const char *randomfiles[] = { DEVRANDOM, NULL };
+ const char **randomfile = NULL;
+ int fd;
+#endif
+#ifdef DEVRANDOM_EGD
+ static const char *egdsockets[] = { DEVRANDOM_EGD, NULL };
+ const char **egdsocket = NULL;
+#endif
+
+#ifdef DEVRANDOM
+ /* Use a random entropy pool device. Linux, FreeBSD and OpenBSD
+ * have this. Use /dev/urandom if you can as /dev/random may block
+ * if it runs out of random entries. */
+
+ for (randomfile = randomfiles; *randomfile && n < ENTROPY_NEEDED; randomfile++)
+ {
+ if ((fd = open(*randomfile, O_RDONLY|O_NONBLOCK
+#ifdef O_NOCTTY /* If it happens to be a TTY (god forbid), do not make it
+ our controlling tty */
+ |O_NOCTTY
+#endif
+#ifdef O_NOFOLLOW /* Fail if the file is a symbolic link */
+ |O_NOFOLLOW
+#endif
+ )) >= 0)
+ {
+ struct timeval t = { 0, 10*1000 }; /* Spend 10ms on
+ each file. */
+ int r;
+ fd_set fset;
+
+ do
+ {
+ FD_ZERO(&fset);
+ FD_SET(fd, &fset);
+ r = -1;
+
+ if (select(fd+1,&fset,NULL,NULL,&t) < 0)
+ t.tv_usec=0;
+ else if (FD_ISSET(fd, &fset))
+ {
+ r=read(fd,(unsigned char *)tmpbuf+n,
+ ENTROPY_NEEDED-n);
+ if (r > 0)
+ n += r;
+ }
+
+ /* Some Unixen will update t, some
+ won't. For those who won't, give
+ up here, otherwise, we will do
+ this once again for the remaining
+ time. */
+ if (t.tv_usec == 10*1000)
+ t.tv_usec=0;
+ }
+ while ((r > 0 || (errno == EINTR || errno == EAGAIN))
+ && t.tv_usec != 0 && n < ENTROPY_NEEDED);
+
+ close(fd);
+ }
+ }
+#endif
+
+#ifdef DEVRANDOM_EGD
+ /* Use an EGD socket to read entropy from an EGD or PRNGD entropy
+ * collecting daemon. */
+
+ for (egdsocket = egdsockets; *egdsocket && n < ENTROPY_NEEDED; egdsocket++)
+ {
+ int r;
+
+ r = RAND_query_egd_bytes(*egdsocket, (unsigned char *)tmpbuf+n,
+ ENTROPY_NEEDED-n);
+ if (r > 0)
+ n += r;
+ }
+#endif
+
+#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
+ if (n > 0)
+ {
+ RAND_add(tmpbuf,sizeof tmpbuf,n);
+ memset(tmpbuf,0,n);
+ }
+#endif
+
+ /* put in some default random data, we need more than just this */
+ l=curr_pid;
+ RAND_add(&l,sizeof(l),0);
+ l=getuid();
+ RAND_add(&l,sizeof(l),0);
+
+ l=time(NULL);
+ RAND_add(&l,sizeof(l),0);
+
+#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
+ return 1;
+#else
+ return 0;
+#endif
+}
+
+#endif
+#endif
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