Squashed 'third_party/libevent/' content from commit d8ceae8
Change-Id: I84e1b23561eb225b9f288717b028e6bc9e5a27e1
git-subtree-dir: third_party/libevent
git-subtree-split: d8ceae81b83f3d0a56e2f41d4c429b2702a8e302
diff --git a/evutil_rand.c b/evutil_rand.c
new file mode 100644
index 0000000..284341c
--- /dev/null
+++ b/evutil_rand.c
@@ -0,0 +1,180 @@
+/*
+ * 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 <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;
+}
+int
+evutil_secure_rng_global_setup_locks_(const int enable_locks)
+{
+ return 0;
+}
+
+static void
+ev_arc4random_buf(void *buf, size_t n)
+{
+#if defined(_EVENT_HAVE_ARC4RANDOM_BUF) && !defined(__APPLE__)
+ return arc4random_buf(buf, n);
+#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) {
+ return arc4random_buf(buf, n);
+ }
+ }
+#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
+
+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();
+ if (!arc4_seeded_ok)
+ arc4_stir();
+ val = arc4_seeded_ok ? 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);
+}
+
+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);
+}
+