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3c30fbcd4a
Commit 7c90026 added #include "conf/domain_conf.h" to
util/virrandom.c. Fortunately it didn't actually use anything from
domain_conf.h, since as far as I'm aware, files in util aren't allowed
to reference anything in conf (although the opposite is allowed). So
this #include is unnecessary.
I verified it still compiles with the line removed, but have placed a
one day moratorium on me doing any "trivial rule" pushes, so will
wait for someone else to verify/ACK before pushing.
133 lines
3.6 KiB
C
133 lines
3.6 KiB
C
/*
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* Copyright (C) 2012 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Authors:
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* Daniel P. Berrange <berrange@redhat.com>
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include "virrandom.h"
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#include "threads.h"
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#include "count-one-bits.h"
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#include "util.h"
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#include "virterror_internal.h"
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#define VIR_FROM_THIS VIR_FROM_NONE
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#define virRandomError(code, ...) \
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virReportErrorHelper(VIR_FROM_NONE, code, __FILE__, \
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__FUNCTION__, __LINE__, __VA_ARGS__)
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static char randomState[128];
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static struct random_data randomData;
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static virMutex randomLock;
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int virRandomInitialize(uint32_t seed)
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{
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if (virMutexInit(&randomLock) < 0)
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return -1;
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if (initstate_r(seed,
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randomState,
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sizeof(randomState),
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&randomData) < 0)
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return -1;
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return 0;
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}
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/* The algorithm of virRandomBits requires that RAND_MAX == 2^n-1 for
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* some n; gnulib's random_r meets this property. */
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verify(((RAND_MAX + 1U) & RAND_MAX) == 0);
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/**
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* virRandomBits:
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* @nbits: Number of bits of randommess required
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*
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* Generate an evenly distributed random number between [0,2^nbits), where
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* @nbits must be in the range (0,64].
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*
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* Return: a random number with @nbits entropy
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*/
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uint64_t virRandomBits(int nbits)
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{
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int bits_per_iter = count_one_bits(RAND_MAX);
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uint64_t ret = 0;
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int32_t bits;
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virMutexLock(&randomLock);
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while (nbits > bits_per_iter) {
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random_r(&randomData, &bits);
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ret = (ret << bits_per_iter) | (bits & RAND_MAX);
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nbits -= bits_per_iter;
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}
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random_r(&randomData, &bits);
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ret = (ret << nbits) | (bits & ((1 << nbits) - 1));
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virMutexUnlock(&randomLock);
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return ret;
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}
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#define QUMRANET_OUI "001a4a"
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#define VMWARE_OUI "000569"
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#define MICROSOFT_OUI "0050f2"
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#define XEN_OUI "00163e"
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int
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virRandomGenerateWWN(char **wwn,
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const char *virt_type) {
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const char *oui = NULL;
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if (!virt_type) {
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virRandomError(VIR_ERR_INVALID_ARG, "%s",
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_("argument virt_type must not be NULL"));
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return -1;
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}
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if (STREQ(virt_type, "QEMU")) {
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oui = QUMRANET_OUI;
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} else if (STREQ(virt_type, "Xen") ||
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STREQ(virt_type, "xenlight") ||
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STREQ(virt_type, "XenAPI")) {
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oui = XEN_OUI;
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} else if (STREQ(virt_type, "ESX") ||
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STREQ(virt_type, "VMWARE")) {
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oui = VMWARE_OUI;
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} else if (STREQ(virt_type, "HYPER-V")) {
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oui = MICROSOFT_OUI;
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} else {
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virRandomError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("Unsupported virt type"));
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return -1;
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}
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if (virAsprintf(wwn, "5" "%s%09llx", oui,
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(unsigned long long)virRandomBits(36)) < 0) {
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virReportOOMError();
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return -1;
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}
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return 0;
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}
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