Repo created

TMessagesProj/jni/third_party/usrsctplib/user_environment.c

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+/*-
+ * Copyright (c) 2009-2010 Brad Penoff
+ * Copyright (c) 2009-2010 Humaira Kamal
+ * Copyright (c) 2011-2012 Irene Ruengeler
+ * Copyright (c) 2011-2012 Michael Tuexen
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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.
+ */
+
+/* __Userspace__ */
+
+#if defined(_WIN32)
+#if !defined(_CRT_RAND_S) && !defined(FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION)
+#define _CRT_RAND_S
+#endif
+#else
+#include <stdint.h>
+#include <netinet/sctp_os_userspace.h>
+#endif
+#ifdef INVARIANTS
+#include <netinet/sctp_pcb.h>
+#endif
+#include <user_environment.h>
+#include <sys/types.h>
+/* #include <sys/param.h> defines MIN */
+#if !defined(MIN)
+#define MIN(arg1,arg2) ((arg1) < (arg2) ? (arg1) : (arg2))
+#endif
+
+#define uHZ 1000
+
+/* See user_include/user_environment.h for comments about these variables */
+int maxsockets = 25600;
+int hz = uHZ;
+int ip_defttl = 64;
+int ipport_firstauto = 49152, ipport_lastauto = 65535;
+int nmbclusters = 65536;
+
+/* Source ip_output.c. extern'd in ip_var.h */
+u_short ip_id = 0; /*__Userspace__ TODO Should it be initialized to zero? */
+
+/* used in user_include/user_atomic.h in order to make the operations
+ * defined there truly atomic
+ */
+userland_mutex_t atomic_mtx;
+
+/* If the entropy device is not loaded, make a token effort to
+ * provide _some_ kind of randomness. This should only be used
+ * inside other RNG's, like arc4random(9).
+ */
+#if defined(FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION)
+#include <string.h>
+
+void
+init_random(void)
+{
+	return;
+}
+
+void
+read_random(void *buf, size_t size)
+{
+	memset(buf, 'A', size);
+	return;
+}
+
+void
+finish_random(void)
+{
+	return;
+}
+/* This define can be used to optionally use OpenSSL's random number utility,
+ * which is capable of bypassing the chromium sandbox which normally would
+ * prevent opening files, including /dev/urandom.
+ */
+#elif defined(SCTP_USE_OPENSSL_RAND)
+#include <openssl/rand.h>
+
+/* Requiring BoringSSL because it guarantees that RAND_bytes will succeed. */
+#ifndef OPENSSL_IS_BORINGSSL
+#error Only BoringSSL is supported with SCTP_USE_OPENSSL_RAND.
+#endif
+
+void
+init_random(void)
+{
+	return;
+}
+
+void
+read_random(void *buf, size_t size)
+{
+	RAND_bytes((uint8_t *)buf, size);
+	return;
+}
+
+void
+finish_random(void)
+{
+	return;
+}
+#elif defined(__FreeBSD__) || defined(__DragonFly__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__) || defined(__Bitrig__)
+#include <stdlib.h>
+
+void
+init_random(void)
+{
+	return;
+}
+
+void
+read_random(void *buf, size_t size)
+{
+	arc4random_buf(buf, size);
+	return;
+}
+
+void
+finish_random(void)
+{
+	return;
+}
+#elif defined(_WIN32)
+#include <stdlib.h>
+
+void
+init_random(void)
+{
+	return;
+}
+
+void
+read_random(void *buf, size_t size)
+{
+	unsigned int randval;
+	size_t position, remaining;
+
+	position = 0;
+	while (position < size) {
+		if (rand_s(&randval) == 0) {
+			remaining = MIN(size - position, sizeof(unsigned int));
+			memcpy((char *)buf + position, &randval, remaining);
+			position += sizeof(unsigned int);
+		}
+	}
+	return;
+}
+
+void
+finish_random(void)
+{
+	return;
+}
+#elif (defined(__ANDROID__) && (__ANDROID_API__ < 28)) || defined(__EMSCRIPTEN__)
+#include <fcntl.h>
+
+static int fd = -1;
+
+void
+init_random(void)
+{
+	fd = open("/dev/urandom", O_RDONLY);
+	return;
+}
+
+void
+read_random(void *buf, size_t size)
+{
+	size_t position;
+	ssize_t n;
+
+	position = 0;
+	while (position < size) {
+		n = read(fd, (char *)buf + position, size - position);
+		if (n > 0) {
+			position += n;
+		}
+	}
+	return;
+}
+
+void
+finish_random(void)
+{
+	close(fd);
+	return;
+}
+#elif defined(__ANDROID__) && (__ANDROID_API__ >= 28)
+#include <sys/random.h>
+
+void
+init_random(void)
+{
+	return;
+}
+
+void
+read_random(void *buf, size_t size)
+{
+	size_t position;
+	ssize_t n;
+
+	position = 0;
+	while (position < size) {
+		n = getrandom((char *)buf + position, size - position, 0);
+		if (n > 0) {
+			position += n;
+		}
+	}
+	return;
+}
+
+void
+finish_random(void)
+{
+	return;
+}
+#elif defined(__linux__)
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+
+#if defined(__has_feature)
+#if __has_feature(memory_sanitizer)
+void __msan_unpoison(void *, size_t);
+#endif
+#endif
+
+#ifdef __NR_getrandom
+#if !defined(GRND_NONBLOCK)
+#define GRND_NONBLOCK 1
+#endif
+static int getrandom_available = 0;
+#endif
+static int fd = -1;
+
+void
+init_random(void)
+{
+#ifdef __NR_getrandom
+	char dummy;
+	ssize_t n = syscall(__NR_getrandom, &dummy, sizeof(dummy), GRND_NONBLOCK);
+	if (n > 0 || errno == EINTR || errno == EAGAIN) {
+		/* Either getrandom succeeded, was interrupted or is waiting for entropy;
+		 * all of which mean the syscall is available.
+		 */
+		getrandom_available = 1;
+	} else {
+#ifdef INVARIANTS
+		if (errno != ENOSYS) {
+			panic("getrandom syscall returned unexpected error: %d", errno);
+		}
+#endif
+		/* If the syscall isn't available, fall back to /dev/urandom. */
+#endif
+		fd = open("/dev/urandom", O_RDONLY);
+#ifdef __NR_getrandom
+	}
+#endif
+	return;
+}
+
+void
+read_random(void *buf, size_t size)
+{
+	size_t position;
+	ssize_t n;
+
+	position = 0;
+	while (position < size) {
+#ifdef __NR_getrandom
+		if (getrandom_available) {
+			/* Using syscall directly because getrandom isn't present in glibc < 2.25.
+			 */
+			n = syscall(__NR_getrandom, (char *)buf + position, size - position, 0);
+			if (n > 0) {
+#if defined(__has_feature)
+#if __has_feature(memory_sanitizer)
+				/* Need to do this because MSan doesn't realize that syscall has
+				 * initialized the output buffer.
+				 */
+				__msan_unpoison(buf + position, n);
+#endif
+#endif
+				position += n;
+			} else if (errno != EINTR && errno != EAGAIN) {
+#ifdef INVARIANTS
+				panic("getrandom syscall returned unexpected error: %d", errno);
+#endif
+			}
+		} else
+#endif /* __NR_getrandom */
+		{
+			n = read(fd, (char *)buf + position, size - position);
+			if (n > 0) {
+				position += n;
+			}
+		}
+	}
+	return;
+}
+
+void
+finish_random(void)
+{
+	if (fd != -1) {
+		close(fd);
+	}
+	return;
+}
+#elif defined(__Fuchsia__)
+#include <zircon/syscalls.h>
+
+void
+init_random(void)
+{
+	return;
+}
+
+void
+read_random(void *buf, size_t size)
+{
+	zx_cprng_draw(buf, size);
+	return;
+}
+
+void
+finish_random(void)
+{
+	return;
+}
+#elif defined(__native_client__)
+#include <nacl/nacl_random.h>
+
+void
+init_random(void)
+{
+	return;
+}
+
+void
+read_random(void *buf, size_t size)
+{
+	size_t position;
+	size_t n;
+
+	position = 0;
+	while (position < size) {
+		if (nacl_secure_random((char *)buf + position, size - position, &n) == 0)
+			position += n;
+		}
+	}
+	return;
+}
+
+void
+finish_random(void)
+{
+	return;
+}
+#else
+#error "Unknown platform. Please provide platform specific RNG."
+#endif