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Add getentropy emulation for FreeBSD

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This commit is contained in:
James Clarke 2019-11-02 18:08:23 +00:00
parent 7dfbcdf276
commit 9b310f4084
3 changed files with 67 additions and 1 deletions
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3
Makefile.in
View File

@ -148,7 +148,7 @@ COMMON_OBJ_ALL_SYMBOLS=@COMMON_OBJ_ALL_SYMBOLS@
COMPAT_SRC=compat/ctime_r.c compat/fake-rfc2553.c compat/gmtime_r.c \
compat/inet_aton.c compat/inet_ntop.c compat/inet_pton.c compat/malloc.c \
compat/memcmp.c compat/memmove.c compat/snprintf.c compat/strlcat.c \
compat/strlcpy.c compat/strptime.c compat/getentropy_linux.c \
compat/strlcpy.c compat/strptime.c compat/getentropy_freebsd.c compat/getentropy_linux.c \
compat/getentropy_osx.c compat/getentropy_solaris.c compat/getentropy_win.c \
compat/explicit_bzero.c compat/arc4random.c compat/arc4random_uniform.c \
compat/arc4_lock.c compat/sha512.c compat/reallocarray.c compat/isblank.c \
@ -1482,6 +1482,7 @@ snprintf.lo snprintf.o: $(srcdir)/compat/snprintf.c config.h
strlcat.lo strlcat.o: $(srcdir)/compat/strlcat.c config.h
strlcpy.lo strlcpy.o: $(srcdir)/compat/strlcpy.c config.h
strptime.lo strptime.o: $(srcdir)/compat/strptime.c config.h
getentropy_freebsd.lo getentropy_freebsd.o: $(srcdir)/compat/getentropy_freebsd.c config.h
getentropy_linux.lo getentropy_linux.o: $(srcdir)/compat/getentropy_linux.c config.h \
getentropy_osx.lo getentropy_osx.o: $(srcdir)/compat/getentropy_osx.c config.h

62
compat/getentropy_freebsd.c Normal file
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@ -0,0 +1,62 @@
/* $OpenBSD: getentropy_freebsd.c,v 1.3 2016/08/07 03:27:21 tb Exp $ */
/*
* Copyright (c) 2014 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* Copyright (c) 2014 Brent Cook <bcook@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Emulation of getentropy(2) as documented at:
* http://man.openbsd.org/getentropy.2
*/
#include <sys/types.h>
#include <sys/sysctl.h>
#include <errno.h>
#include <stddef.h>
/*
* Derived from lib/libc/gen/arc4random.c from FreeBSD.
*/
static size_t
getentropy_sysctl(u_char *buf, size_t size)
{
int mib[2];
size_t len, done;
mib[0] = CTL_KERN;
mib[1] = KERN_ARND;
done = 0;
do {
len = size;
if (sysctl(mib, 2, buf, &len, NULL, 0) == -1)
return (done);
done += len;
buf += len;
size -= len;
} while (size > 0);
return (done);
}
int
getentropy(void *buf, size_t len)
{
if (len <= 256 && getentropy_sysctl(buf, len) == len)
return (0);
errno = EIO;
return (-1);
}

3
configure.ac
View File

@ -1528,6 +1528,9 @@ if test "$USE_NSS" = "no"; then
fi
AC_SEARCH_LIBS([clock_gettime], [rt])
;;
*freebsd*|*FreeBSD)
AC_LIBOBJ(getentropy_freebsd)
;;
*linux*|Linux|*)
AC_LIBOBJ(getentropy_linux)
AC_CHECK_FUNCS([SHA512_Update],,[