385 lines
7.5 KiB
C
Executable File
385 lines
7.5 KiB
C
Executable File
/*-
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* Copyright (c) 2009-2010 Brad Penoff
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* Copyright (c) 2009-2010 Humaira Kamal
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* Copyright (c) 2011-2012 Irene Ruengeler
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* Copyright (c) 2011-2012 Michael Tuexen
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* __Userspace__ */
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#if defined(_WIN32)
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#if !defined(_CRT_RAND_S) && !defined(FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION)
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#define _CRT_RAND_S
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#endif
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#else
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#include <stdint.h>
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#include <netinet/sctp_os_userspace.h>
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#endif
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#ifdef INVARIANTS
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#include <netinet/sctp_pcb.h>
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#endif
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#include <user_environment.h>
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#include <sys/types.h>
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/* #include <sys/param.h> defines MIN */
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#if !defined(MIN)
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#define MIN(arg1,arg2) ((arg1) < (arg2) ? (arg1) : (arg2))
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#endif
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#define uHZ 1000
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/* See user_include/user_environment.h for comments about these variables */
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int maxsockets = 25600;
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int hz = uHZ;
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int ip_defttl = 64;
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int ipport_firstauto = 49152, ipport_lastauto = 65535;
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int nmbclusters = 65536;
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/* Source ip_output.c. extern'd in ip_var.h */
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u_short ip_id = 0; /*__Userspace__ TODO Should it be initialized to zero? */
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/* used in user_include/user_atomic.h in order to make the operations
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* defined there truly atomic
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*/
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userland_mutex_t atomic_mtx;
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/* If the entropy device is not loaded, make a token effort to
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* provide _some_ kind of randomness. This should only be used
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* inside other RNG's, like arc4random(9).
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*/
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#if defined(FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION)
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#include <string.h>
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void
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init_random(void)
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{
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return;
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}
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void
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read_random(void *buf, size_t size)
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{
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memset(buf, 'A', size);
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return;
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}
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void
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finish_random(void)
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{
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return;
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}
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/* This define can be used to optionally use OpenSSL's random number utility,
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* which is capable of bypassing the chromium sandbox which normally would
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* prevent opening files, including /dev/urandom.
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*/
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#elif defined(SCTP_USE_OPENSSL_RAND)
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#include <openssl/rand.h>
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/* Requiring BoringSSL because it guarantees that RAND_bytes will succeed. */
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#ifndef OPENSSL_IS_BORINGSSL
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#error Only BoringSSL is supported with SCTP_USE_OPENSSL_RAND.
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#endif
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void
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init_random(void)
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{
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return;
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}
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void
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read_random(void *buf, size_t size)
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{
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RAND_bytes((uint8_t *)buf, size);
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return;
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}
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void
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finish_random(void)
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{
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return;
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}
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#elif defined(__FreeBSD__) || defined(__DragonFly__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__) || defined(__Bitrig__)
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#include <stdlib.h>
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void
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init_random(void)
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{
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return;
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}
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void
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read_random(void *buf, size_t size)
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{
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arc4random_buf(buf, size);
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return;
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}
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void
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finish_random(void)
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{
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return;
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}
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#elif defined(_WIN32)
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#include <stdlib.h>
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void
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init_random(void)
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{
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return;
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}
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void
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read_random(void *buf, size_t size)
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{
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unsigned int randval;
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size_t position, remaining;
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position = 0;
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while (position < size) {
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if (rand_s(&randval) == 0) {
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remaining = MIN(size - position, sizeof(unsigned int));
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memcpy((char *)buf + position, &randval, remaining);
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position += sizeof(unsigned int);
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}
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}
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return;
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}
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void
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finish_random(void)
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{
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return;
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}
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#elif (defined(__ANDROID__) && (__ANDROID_API__ < 28)) || defined(__EMSCRIPTEN__)
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#include <fcntl.h>
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static int fd = -1;
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void
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init_random(void)
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{
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fd = open("/dev/urandom", O_RDONLY);
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return;
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}
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void
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read_random(void *buf, size_t size)
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{
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size_t position;
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ssize_t n;
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position = 0;
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while (position < size) {
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n = read(fd, (char *)buf + position, size - position);
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if (n > 0) {
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position += n;
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}
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}
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return;
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}
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void
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finish_random(void)
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{
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close(fd);
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return;
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}
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#elif defined(__ANDROID__) && (__ANDROID_API__ >= 28)
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#include <sys/random.h>
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void
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init_random(void)
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{
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return;
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}
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void
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read_random(void *buf, size_t size)
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{
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size_t position;
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ssize_t n;
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position = 0;
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while (position < size) {
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n = getrandom((char *)buf + position, size - position, 0);
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if (n > 0) {
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position += n;
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}
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}
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return;
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}
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void
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finish_random(void)
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{
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return;
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}
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#elif defined(__linux__)
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#if defined(__has_feature)
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#if __has_feature(memory_sanitizer)
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void __msan_unpoison(void *, size_t);
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#endif
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#endif
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#ifdef __NR_getrandom
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#if !defined(GRND_NONBLOCK)
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#define GRND_NONBLOCK 1
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#endif
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static int getrandom_available = 0;
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#endif
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static int fd = -1;
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void
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init_random(void)
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{
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#ifdef __NR_getrandom
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char dummy;
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ssize_t n = syscall(__NR_getrandom, &dummy, sizeof(dummy), GRND_NONBLOCK);
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if (n > 0 || errno == EINTR || errno == EAGAIN) {
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/* Either getrandom succeeded, was interrupted or is waiting for entropy;
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* all of which mean the syscall is available.
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*/
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getrandom_available = 1;
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} else {
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#ifdef INVARIANTS
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if (errno != ENOSYS) {
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panic("getrandom syscall returned unexpected error: %d", errno);
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}
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#endif
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/* If the syscall isn't available, fall back to /dev/urandom. */
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#endif
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fd = open("/dev/urandom", O_RDONLY);
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#ifdef __NR_getrandom
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}
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#endif
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return;
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}
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void
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read_random(void *buf, size_t size)
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{
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size_t position;
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ssize_t n;
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position = 0;
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while (position < size) {
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#ifdef __NR_getrandom
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if (getrandom_available) {
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/* Using syscall directly because getrandom isn't present in glibc < 2.25.
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*/
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n = syscall(__NR_getrandom, (char *)buf + position, size - position, 0);
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if (n > 0) {
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#if defined(__has_feature)
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#if __has_feature(memory_sanitizer)
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/* Need to do this because MSan doesn't realize that syscall has
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* initialized the output buffer.
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*/
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__msan_unpoison(buf + position, n);
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#endif
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#endif
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position += n;
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} else if (errno != EINTR && errno != EAGAIN) {
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#ifdef INVARIANTS
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panic("getrandom syscall returned unexpected error: %d", errno);
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#endif
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}
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} else
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#endif /* __NR_getrandom */
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{
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n = read(fd, (char *)buf + position, size - position);
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if (n > 0) {
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position += n;
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}
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}
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}
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return;
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}
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void
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finish_random(void)
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{
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if (fd != -1) {
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close(fd);
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}
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return;
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}
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#elif defined(__Fuchsia__)
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#include <zircon/syscalls.h>
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void
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init_random(void)
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{
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return;
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}
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void
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read_random(void *buf, size_t size)
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{
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zx_cprng_draw(buf, size);
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return;
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}
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void
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finish_random(void)
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{
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return;
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}
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#elif defined(__native_client__)
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#include <nacl/nacl_random.h>
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void
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init_random(void)
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{
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return;
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}
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void
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read_random(void *buf, size_t size)
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{
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size_t position;
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size_t n;
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position = 0;
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while (position < size) {
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if (nacl_secure_random((char *)buf + position, size - position, &n) == 0)
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position += n;
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}
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}
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return;
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}
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void
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finish_random(void)
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{
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return;
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}
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#else
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#error "Unknown platform. Please provide platform specific RNG."
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#endif
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