mirror of
https://github.com/ceph/ceph-csi.git
synced 2025-03-09 08:59:30 +00:00
f87d06ed85
Several packages are only used while running the e2e suite. These packages are less important to update, as the they can not influence the final executable that is part of the Ceph-CSI container-image. By moving these dependencies out of the main Ceph-CSI go.mod, it is easier to identify if a reported CVE affects Ceph-CSI, or only the testing (like most of the Kubernetes CVEs). Signed-off-by: Niels de Vos <ndevos@ibm.com>
105 lines
3.3 KiB
Go
105 lines
3.3 KiB
Go
// Copyright 2023 Google Inc. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package uuid
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import (
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"io"
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)
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// UUID version 7 features a time-ordered value field derived from the widely
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// implemented and well known Unix Epoch timestamp source,
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// the number of milliseconds seconds since midnight 1 Jan 1970 UTC, leap seconds excluded.
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// As well as improved entropy characteristics over versions 1 or 6.
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//
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// see https://datatracker.ietf.org/doc/html/draft-peabody-dispatch-new-uuid-format-03#name-uuid-version-7
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//
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// Implementations SHOULD utilize UUID version 7 over UUID version 1 and 6 if possible.
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//
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// NewV7 returns a Version 7 UUID based on the current time(Unix Epoch).
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// Uses the randomness pool if it was enabled with EnableRandPool.
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// On error, NewV7 returns Nil and an error
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func NewV7() (UUID, error) {
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uuid, err := NewRandom()
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if err != nil {
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return uuid, err
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}
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makeV7(uuid[:])
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return uuid, nil
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}
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// NewV7FromReader returns a Version 7 UUID based on the current time(Unix Epoch).
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// it use NewRandomFromReader fill random bits.
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// On error, NewV7FromReader returns Nil and an error.
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func NewV7FromReader(r io.Reader) (UUID, error) {
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uuid, err := NewRandomFromReader(r)
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if err != nil {
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return uuid, err
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}
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makeV7(uuid[:])
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return uuid, nil
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}
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// makeV7 fill 48 bits time (uuid[0] - uuid[5]), set version b0111 (uuid[6])
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// uuid[8] already has the right version number (Variant is 10)
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// see function NewV7 and NewV7FromReader
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func makeV7(uuid []byte) {
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/*
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| unix_ts_ms |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| unix_ts_ms | ver | rand_a (12 bit seq) |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|var| rand_b |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| rand_b |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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_ = uuid[15] // bounds check
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t, s := getV7Time()
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uuid[0] = byte(t >> 40)
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uuid[1] = byte(t >> 32)
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uuid[2] = byte(t >> 24)
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uuid[3] = byte(t >> 16)
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uuid[4] = byte(t >> 8)
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uuid[5] = byte(t)
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uuid[6] = 0x70 | (0x0F & byte(s>>8))
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uuid[7] = byte(s)
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}
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// lastV7time is the last time we returned stored as:
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//
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// 52 bits of time in milliseconds since epoch
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// 12 bits of (fractional nanoseconds) >> 8
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var lastV7time int64
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const nanoPerMilli = 1000000
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// getV7Time returns the time in milliseconds and nanoseconds / 256.
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// The returned (milli << 12 + seq) is guarenteed to be greater than
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// (milli << 12 + seq) returned by any previous call to getV7Time.
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func getV7Time() (milli, seq int64) {
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timeMu.Lock()
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defer timeMu.Unlock()
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nano := timeNow().UnixNano()
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milli = nano / nanoPerMilli
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// Sequence number is between 0 and 3906 (nanoPerMilli>>8)
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seq = (nano - milli*nanoPerMilli) >> 8
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now := milli<<12 + seq
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if now <= lastV7time {
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now = lastV7time + 1
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milli = now >> 12
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seq = now & 0xfff
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}
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lastV7time = now
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return milli, seq
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}
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