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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.
package procfs
import (
"bufio"
"bytes"
"fmt"
"io"
"strconv"
"strings"
"github.com/prometheus/procfs/internal/util"
)
// Wireless models the content of /proc/net/wireless.
type Wireless struct {
Name string
// Status is the current 4-digit hex value status of the interface.
Status uint64
// QualityLink is the link quality.
QualityLink int
// QualityLevel is the signal gain (dBm).
QualityLevel int
// QualityNoise is the signal noise baseline (dBm).
QualityNoise int
// DiscardedNwid is the number of discarded packets with wrong nwid/essid.
DiscardedNwid int
// DiscardedCrypt is the number of discarded packets with wrong code/decode (WEP).
DiscardedCrypt int
// DiscardedFrag is the number of discarded packets that can't perform MAC reassembly.
DiscardedFrag int
// DiscardedRetry is the number of discarded packets that reached max MAC retries.
DiscardedRetry int
// DiscardedMisc is the number of discarded packets for other reasons.
DiscardedMisc int
// MissedBeacon is the number of missed beacons/superframe.
MissedBeacon int
}
// Wireless returns kernel wireless statistics.
func (fs FS) Wireless() ([]*Wireless, error) {
b, err := util.ReadFileNoStat(fs.proc.Path("net/wireless"))
if err != nil {
return nil, err
}
m, err := parseWireless(bytes.NewReader(b))
if err != nil {
return nil, fmt.Errorf("%s: wireless: %w", ErrFileParse, err)
}
return m, nil
}
// parseWireless parses the contents of /proc/net/wireless.
/*
Inter-| sta-| Quality | Discarded packets | Missed | WE
face | tus | link level noise | nwid crypt frag retry misc | beacon | 22
eth1: 0000 5. -256. -10. 0 1 0 3 0 0
eth2: 0000 5. -256. -20. 0 2 0 4 0 0
*/
func parseWireless(r io.Reader) ([]*Wireless, error) {
var (
interfaces []*Wireless
scanner = bufio.NewScanner(r)
)
for n := 0; scanner.Scan(); n++ {
// Skip the 2 header lines.
if n < 2 {
continue
}
line := scanner.Text()
parts := strings.Split(line, ":")
if len(parts) != 2 {
return nil, fmt.Errorf("%w: expected 2 parts after splitting line by ':', got %d for line %q", ErrFileParse, len(parts), line)
}
name := strings.TrimSpace(parts[0])
stats := strings.Fields(parts[1])
if len(stats) < 10 {
return nil, fmt.Errorf("%w: invalid number of fields in line %d, expected 10+, got %d: %q", ErrFileParse, n, len(stats), line)
}
status, err := strconv.ParseUint(stats[0], 16, 16)
if err != nil {
return nil, fmt.Errorf("%w: invalid status in line %d: %q", ErrFileParse, n, line)
}
qlink, err := strconv.Atoi(strings.TrimSuffix(stats[1], "."))
if err != nil {
return nil, fmt.Errorf("%s: parse Quality:link as integer %q: %w", ErrFileParse, qlink, err)
}
qlevel, err := strconv.Atoi(strings.TrimSuffix(stats[2], "."))
if err != nil {
return nil, fmt.Errorf("%s: Quality:level as integer %q: %w", ErrFileParse, qlevel, err)
}
qnoise, err := strconv.Atoi(strings.TrimSuffix(stats[3], "."))
if err != nil {
return nil, fmt.Errorf("%s: Quality:noise as integer %q: %w", ErrFileParse, qnoise, err)
}
dnwid, err := strconv.Atoi(stats[4])
if err != nil {
return nil, fmt.Errorf("%s: Discarded:nwid as integer %q: %w", ErrFileParse, dnwid, err)
}
dcrypt, err := strconv.Atoi(stats[5])
if err != nil {
return nil, fmt.Errorf("%s: Discarded:crypt as integer %q: %w", ErrFileParse, dcrypt, err)
}
dfrag, err := strconv.Atoi(stats[6])
if err != nil {
return nil, fmt.Errorf("%s: Discarded:frag as integer %q: %w", ErrFileParse, dfrag, err)
}
dretry, err := strconv.Atoi(stats[7])
if err != nil {
return nil, fmt.Errorf("%s: Discarded:retry as integer %q: %w", ErrFileParse, dretry, err)
}
dmisc, err := strconv.Atoi(stats[8])
if err != nil {
return nil, fmt.Errorf("%s: Discarded:misc as integer %q: %w", ErrFileParse, dmisc, err)
}
mbeacon, err := strconv.Atoi(stats[9])
if err != nil {
return nil, fmt.Errorf("%s: Missed:beacon as integer %q: %w", ErrFileParse, mbeacon, err)
}
w := &Wireless{
Name: name,
Status: status,
QualityLink: qlink,
QualityLevel: qlevel,
QualityNoise: qnoise,
DiscardedNwid: dnwid,
DiscardedCrypt: dcrypt,
DiscardedFrag: dfrag,
DiscardedRetry: dretry,
DiscardedMisc: dmisc,
MissedBeacon: mbeacon,
}
interfaces = append(interfaces, w)
}
if err := scanner.Err(); err != nil {
return nil, fmt.Errorf("%s: Failed to scan /proc/net/wireless: %w", ErrFileRead, err)
}
return interfaces, nil
}
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