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https://github.com/prometheus/node_exporter.git
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729a03136f
Sanitize zero terminated strings from OpenBSD device name parsing. * Add byte-to-string util function. Fixes: https://github.com/prometheus/node_exporter/issues/3287 Signed-off-by: Ben Kochie <superq@gmail.com>
48 lines
1.2 KiB
Go
48 lines
1.2 KiB
Go
// Copyright 2024 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package utils
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import (
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"bytes"
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"strings"
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)
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func SafeDereference[T any](s ...*T) []T {
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var resolved []T
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for _, v := range s {
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if v != nil {
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resolved = append(resolved, *v)
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} else {
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var zeroValue T
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resolved = append(resolved, zeroValue)
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}
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}
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return resolved
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}
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// SafeBytesToString takes a slice of bytes and sanitizes it for Prometheus label
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// values.
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// * Terminate the string at the first null byte.
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// * Convert any invalid UTF-8 to "<22>".
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func SafeBytesToString(b []byte) string {
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var s string
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zeroIndex := bytes.IndexByte(b, 0)
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if zeroIndex == -1 {
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s = string(b)
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} else {
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s = string(b[:zeroIndex])
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}
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return strings.ToValidUTF8(s, "<22>")
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}
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