mirror of
https://github.com/tildearrow/furnace.git
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89 lines
2 KiB
C
89 lines
2 KiB
C
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/*
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* Copyright (c) 2021
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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// MP support header
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#include "MacportsLegacySupport.h"
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#if __MP_LEGACY_SUPPORT_GETENTROPY__
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#include <fcntl.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/random.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <errno.h>
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void
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_error(int doexit, int err, const char* fmt, ...)
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{
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va_list ap;
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fflush(stdout);
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fflush(stderr);
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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if (err > 0)
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fprintf(stderr, "\n %s (Errno %d)\n", strerror(err), err);
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if (doexit) {
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fflush(stderr);
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exit(1);
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}
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}
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static int
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_randopen(const char* name)
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{
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int fd = open(name, O_RDONLY);
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if (fd < 0) {
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_error(1, errno, "Cannot open system random number dev %s", name);
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}
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return fd;
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}
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int
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getentropy(void* buf, size_t n)
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{
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static int fd = -1;
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uint8_t* b = (uint8_t*)buf;
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if (fd < 0)
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fd = _randopen("/dev/urandom");
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while (n > 0)
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{
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ssize_t m = (read)(fd, b, n);
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if (m < 0) {
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if (errno == EINTR) continue;
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_error(1, errno, "Fatal read error while reading rand dev");
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}
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b += m;
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n -= m;
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}
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return 0;
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}
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#endif /* __MP_LEGACY_SUPPORT_GETENTROPY__ */
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