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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(__QNX__) || 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