selfcare init

proxy_c/third-lib/libevent-2.1.11-stable/evutil_rand.c

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+/*
+ * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
+ *
+ * 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. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 file has our secure PRNG code.  On platforms that have arc4random(),
+ * we just use that.  Otherwise, we include arc4random.c as a bunch of static
+ * functions, and wrap it lightly.  We don't expose the arc4random*() APIs
+ * because A) they aren't in our namespace, and B) it's not nice to name your
+ * APIs after their implementations.  We keep them in a separate file
+ * so that other people can rip it out and use it for whatever.
+ */
+
+#include "event2/event-config.h"
+#include "evconfig-private.h"
+
+#include <limits.h>
+
+#include "util-internal.h"
+#include "evthread-internal.h"
+
+#ifdef EVENT__HAVE_ARC4RANDOM
+#include <stdlib.h>
+#include <string.h>
+int
+evutil_secure_rng_set_urandom_device_file(char *fname)
+{
+	(void) fname;
+	return -1;
+}
+int
+evutil_secure_rng_init(void)
+{
+	/* call arc4random() now to force it to self-initialize */
+	(void) arc4random();
+	return 0;
+}
+#ifndef EVENT__DISABLE_THREAD_SUPPORT
+int
+evutil_secure_rng_global_setup_locks_(const int enable_locks)
+{
+	return 0;
+}
+#endif
+static void
+evutil_free_secure_rng_globals_locks(void)
+{
+}
+
+static void
+ev_arc4random_buf(void *buf, size_t n)
+{
+#if defined(EVENT__HAVE_ARC4RANDOM_BUF) && !defined(__APPLE__)
+	arc4random_buf(buf, n);
+	return;
+#else
+	unsigned char *b = buf;
+
+#if defined(EVENT__HAVE_ARC4RANDOM_BUF)
+	/* OSX 10.7 introducd arc4random_buf, so if you build your program
+	 * there, you'll get surprised when older versions of OSX fail to run.
+	 * To solve this, we can check whether the function pointer is set,
+	 * and fall back otherwise.  (OSX does this using some linker
+	 * trickery.)
+	 */
+	{
+		void (*tptr)(void *,size_t) =
+		    (void (*)(void*,size_t))arc4random_buf;
+		if (tptr != NULL) {
+			arc4random_buf(buf, n);
+			return;
+		}
+	}
+#endif
+	/* Make sure that we start out with b at a 4-byte alignment; plenty
+	 * of CPUs care about this for 32-bit access. */
+	if (n >= 4 && ((ev_uintptr_t)b) & 3) {
+		ev_uint32_t u = arc4random();
+		int n_bytes = 4 - (((ev_uintptr_t)b) & 3);
+		memcpy(b, &u, n_bytes);
+		b += n_bytes;
+		n -= n_bytes;
+	}
+	while (n >= 4) {
+		*(ev_uint32_t*)b = arc4random();
+		b += 4;
+		n -= 4;
+	}
+	if (n) {
+		ev_uint32_t u = arc4random();
+		memcpy(b, &u, n);
+	}
+#endif
+}
+
+#else /* !EVENT__HAVE_ARC4RANDOM { */
+
+#ifdef EVENT__ssize_t
+#define ssize_t EVENT__ssize_t
+#endif
+#define ARC4RANDOM_EXPORT static
+#define ARC4_LOCK_() EVLOCK_LOCK(arc4rand_lock, 0)
+#define ARC4_UNLOCK_() EVLOCK_UNLOCK(arc4rand_lock, 0)
+#ifndef EVENT__DISABLE_THREAD_SUPPORT
+static void *arc4rand_lock;
+#endif
+
+#define ARC4RANDOM_UINT32 ev_uint32_t
+#define ARC4RANDOM_NOSTIR
+#define ARC4RANDOM_NORANDOM
+#define ARC4RANDOM_NOUNIFORM
+
+#include "./arc4random.c"
+
+#ifndef EVENT__DISABLE_THREAD_SUPPORT
+int
+evutil_secure_rng_global_setup_locks_(const int enable_locks)
+{
+	EVTHREAD_SETUP_GLOBAL_LOCK(arc4rand_lock, 0);
+	return 0;
+}
+#endif
+
+static void
+evutil_free_secure_rng_globals_locks(void)
+{
+#ifndef EVENT__DISABLE_THREAD_SUPPORT
+	if (arc4rand_lock != NULL) {
+		EVTHREAD_FREE_LOCK(arc4rand_lock, 0);
+		arc4rand_lock = NULL;
+	}
+#endif
+	return;
+}
+
+int
+evutil_secure_rng_set_urandom_device_file(char *fname)
+{
+#ifdef TRY_SEED_URANDOM
+	ARC4_LOCK_();
+	arc4random_urandom_filename = fname;
+	ARC4_UNLOCK_();
+#endif
+	return 0;
+}
+
+int
+evutil_secure_rng_init(void)
+{
+	int val;
+
+	ARC4_LOCK_();
+	val = (!arc4_stir()) ? 0 : -1;
+	ARC4_UNLOCK_();
+	return val;
+}
+
+static void
+ev_arc4random_buf(void *buf, size_t n)
+{
+	arc4random_buf(buf, n);
+}
+
+#endif /* } !EVENT__HAVE_ARC4RANDOM */
+
+void
+evutil_secure_rng_get_bytes(void *buf, size_t n)
+{
+	ev_arc4random_buf(buf, n);
+}
+
+#if !defined(EVENT__HAVE_ARC4RANDOM) || defined(EVENT__HAVE_ARC4RANDOM_ADDRANDOM)
+void
+evutil_secure_rng_add_bytes(const char *buf, size_t n)
+{
+	arc4random_addrandom((unsigned char*)buf,
+	    n>(size_t)INT_MAX ? INT_MAX : (int)n);
+}
+#endif
+
+void
+evutil_free_secure_rng_globals_(void)
+{
+    evutil_free_secure_rng_globals_locks();
+}