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libvirt/src/util/virrandom.h

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Introduce new API for generating random numbers The old virRandom() API was not generating good random numbers. Replace it with a new API virRandomBits which instead of being told the upper limit, gets told the number of bits of randomness required. * src/util/virrandom.c, src/util/virrandom.h: Add virRandomBits, and move virRandomInitialize * src/util/util.h, src/util/util.c: Delete virRandom and virRandomInitialize * src/libvirt.c, src/security/security_selinux.c, src/test/test_driver.c, src/util/iohelper.c: Update for changes from virRandom to virRandomBits * src/storage/storage_backend_iscsi.c: Remove bogus call to virRandomInitialize & convert to virRandomBits
2012-01-25 15:17:46 +00:00
/*
util: Introduce virRandomBytes Using the existing virUUIDGenerateRandomBytes, move API to virrandom.c rename it to virRandomBytes and add it to libvirt_private.syms. This will be used as a fallback for generating a domain master key.
2016-03-29 22:15:33 +00:00
* Copyright (C) 2012, 2016 Red Hat, Inc.
Introduce new API for generating random numbers The old virRandom() API was not generating good random numbers. Replace it with a new API virRandomBits which instead of being told the upper limit, gets told the number of bits of randomness required. * src/util/virrandom.c, src/util/virrandom.h: Add virRandomBits, and move virRandomInitialize * src/util/util.h, src/util/util.c: Delete virRandom and virRandomInitialize * src/libvirt.c, src/security/security_selinux.c, src/test/test_driver.c, src/util/iohelper.c: Update for changes from virRandom to virRandomBits * src/storage/storage_backend_iscsi.c: Remove bogus call to virRandomInitialize & convert to virRandomBits
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*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
maint: fix up copyright notice inconsistencies https://www.gnu.org/licenses/gpl-howto.html recommends that the 'If not, see <url>.' phrase be a separate sentence. * tests/securityselinuxhelper.c: Remove doubled line. * tests/securityselinuxtest.c: Likewise. * globally: s/; If/. If/
2012-09-20 22:30:55 +00:00
* License along with this library. If not, see
Desert the FSF address in copyright Per the FSF address could be changed from time to time, and GNU recommends the following now: (http://www.gnu.org/licenses/gpl-howto.html) You should have received a copy of the GNU General Public License along with Foobar. If not, see <http://www.gnu.org/licenses/>. This patch removes the explicit FSF address, and uses above instead (of course, with inserting 'Lesser' before 'General'). Except a bunch of files for security driver, all others are changed automatically, the copyright for securify files are not complete, that's why to do it manually: src/security/security_selinux.h src/security/security_driver.h src/security/security_selinux.c src/security/security_apparmor.h src/security/security_apparmor.c src/security/security_driver.c
2012-07-21 10:06:23 +00:00
* <http://www.gnu.org/licenses/>.
Introduce new API for generating random numbers The old virRandom() API was not generating good random numbers. Replace it with a new API virRandomBits which instead of being told the upper limit, gets told the number of bits of randomness required. * src/util/virrandom.c, src/util/virrandom.h: Add virRandomBits, and move virRandomInitialize * src/util/util.h, src/util/util.c: Delete virRandom and virRandomInitialize * src/libvirt.c, src/security/security_selinux.c, src/test/test_driver.c, src/util/iohelper.c: Update for changes from virRandom to virRandomBits * src/storage/storage_backend_iscsi.c: Remove bogus call to virRandomInitialize & convert to virRandomBits
2012-01-25 15:17:46 +00:00
*
* Authors:
* Daniel P. Berrange <berrange@redhat.com>
*/
#ifndef __VIR_RANDOM_H__
# define __VIR_RANDOM_H__
# include "internal.h"
Prevent more compiler optimization of mockable functions Currently all mockable functions are annotated with the 'noinline' attribute. This is insufficient to guarantee that a function can be reliably mocked with an LD_PRELOAD. The C language spec allows the compiler to assume there is only a single implementation of each function. It can thus do things like propagating constant return values into the caller at compile time, or creating multiple specialized copies of the function body each optimized for a different caller. To prevent these optimizations we must also set the 'noclone' and 'weak' attributes. This fixes the test suite when libvirt.so is built with CLang with optimization enabled. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-07-05 10:46:28 +00:00
uint64_t virRandomBits(int nbits) ATTRIBUTE_MOCKABLE;
Add virRandom() API to generate numbers with non-power-of-2 limit The current virRandomBits() API is only usable if the caller wants a random number in the range [0, n-1) where n is a power of two. This adds a virRandom() API which generates a double in the range [0.0,1.0) with 48 bits of entropy. It then also adds a virRandomInt(uint32_t max) API which generates an unsigned in the range [0,@max) Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2012-08-10 13:01:23 +00:00
double virRandom(void);
uint32_t virRandomInt(uint32_t max);
util: Introduce virRandomBytes Using the existing virUUIDGenerateRandomBytes, move API to virrandom.c rename it to virRandomBytes and add it to libvirt_private.syms. This will be used as a fallback for generating a domain master key.
2016-03-29 22:15:33 +00:00
int virRandomBytes(unsigned char *buf, size_t buflen)
Prevent more compiler optimization of mockable functions Currently all mockable functions are annotated with the 'noinline' attribute. This is insufficient to guarantee that a function can be reliably mocked with an LD_PRELOAD. The C language spec allows the compiler to assume there is only a single implementation of each function. It can thus do things like propagating constant return values into the caller at compile time, or creating multiple specialized copies of the function body each optimized for a different caller. To prevent these optimizations we must also set the 'noclone' and 'weak' attributes. This fixes the test suite when libvirt.so is built with CLang with optimization enabled. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-07-05 10:46:28 +00:00
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK ATTRIBUTE_MOCKABLE;
int virRandomGenerateWWN(char **wwn, const char *virt_type) ATTRIBUTE_MOCKABLE;
Introduce new API for generating random numbers The old virRandom() API was not generating good random numbers. Replace it with a new API virRandomBits which instead of being told the upper limit, gets told the number of bits of randomness required. * src/util/virrandom.c, src/util/virrandom.h: Add virRandomBits, and move virRandomInitialize * src/util/util.h, src/util/util.c: Delete virRandom and virRandomInitialize * src/libvirt.c, src/security/security_selinux.c, src/test/test_driver.c, src/util/iohelper.c: Update for changes from virRandom to virRandomBits * src/storage/storage_backend_iscsi.c: Remove bogus call to virRandomInitialize & convert to virRandomBits
2012-01-25 15:17:46 +00:00
#endif /* __VIR_RANDOM_H__ */
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