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// Copyright 2023 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build linux && !noselinux
// +build linux,!noselinux
package selinuxfs
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
)
// SELinux access vector cache hashtable statistics.
type AVCHashStat struct {
// Number of entries
Entries uint64
// Number of buckets used
BucketsUsed uint64
// Number of buckets available
BucketsAvailable uint64
// Length of the longest chain
LongestChain uint64
}
// ParseAVCHashStats returns the SELinux access vector cache hashtable
// statistics, or error on failure.
func (fs FS) ParseAVCHashStats() (AVCHashStat, error) {
avcHashStat := AVCHashStat{}
file, err := os.Open(fs.selinux.Path("avc/hash_stats"))
if err != nil {
return avcHashStat, err
}
defer file.Close()
scanner := bufio.NewScanner(file)
scanner.Scan()
entriesValue := strings.TrimPrefix(scanner.Text(), "entries: ")
scanner.Scan()
bucketsValues := strings.Split(scanner.Text(), "buckets used: ")
bucketsValuesTuple := strings.Split(bucketsValues[1], "/")
scanner.Scan()
longestChainValue := strings.TrimPrefix(scanner.Text(), "longest chain: ")
avcHashStat.Entries, err = strconv.ParseUint(entriesValue, 0, 64)
if err != nil {
return avcHashStat, fmt.Errorf("could not parse expected integer value for hash entries")
}
avcHashStat.BucketsUsed, err = strconv.ParseUint(bucketsValuesTuple[0], 0, 64)
if err != nil {
return avcHashStat, fmt.Errorf("could not parse expected integer value for hash buckets used")
}
avcHashStat.BucketsAvailable, err = strconv.ParseUint(bucketsValuesTuple[1], 0, 64)
if err != nil {
return avcHashStat, fmt.Errorf("could not parse expected integer value for hash buckets available")
}
avcHashStat.LongestChain, err = strconv.ParseUint(longestChainValue, 0, 64)
if err != nil {
return avcHashStat, fmt.Errorf("could not parse expected integer value for hash longest chain")
}
return avcHashStat, scanner.Err()
}
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