148 lines
3.9 KiB
Go
148 lines
3.9 KiB
Go
// Copyright 2017 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 !noarp
|
|
// +build !noarp
|
|
|
|
package collector
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"log/slog"
|
|
"net"
|
|
|
|
"github.com/alecthomas/kingpin/v2"
|
|
"github.com/jsimonetti/rtnetlink/v2"
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
"github.com/prometheus/procfs"
|
|
"golang.org/x/sys/unix"
|
|
)
|
|
|
|
var (
|
|
arpDeviceInclude = kingpin.Flag("collector.arp.device-include", "Regexp of arp devices to include (mutually exclusive to device-exclude).").String()
|
|
arpDeviceExclude = kingpin.Flag("collector.arp.device-exclude", "Regexp of arp devices to exclude (mutually exclusive to device-include).").String()
|
|
arpNetlink = kingpin.Flag("collector.arp.netlink", "Use netlink to gather stats instead of /proc/net/arp.").Default("true").Bool()
|
|
)
|
|
|
|
type arpCollector struct {
|
|
fs procfs.FS
|
|
deviceFilter deviceFilter
|
|
entries *prometheus.Desc
|
|
logger *slog.Logger
|
|
}
|
|
|
|
func init() {
|
|
registerCollector("arp", defaultEnabled, NewARPCollector)
|
|
}
|
|
|
|
// NewARPCollector returns a new Collector exposing ARP stats.
|
|
func NewARPCollector(logger *slog.Logger) (Collector, error) {
|
|
fs, err := procfs.NewFS(*procPath)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to open procfs: %w", err)
|
|
}
|
|
|
|
return &arpCollector{
|
|
fs: fs,
|
|
deviceFilter: newDeviceFilter(*arpDeviceExclude, *arpDeviceInclude),
|
|
entries: prometheus.NewDesc(
|
|
prometheus.BuildFQName(namespace, "arp", "entries"),
|
|
"ARP entries by device",
|
|
[]string{"device"}, nil,
|
|
),
|
|
logger: logger,
|
|
}, nil
|
|
}
|
|
|
|
func getTotalArpEntries(deviceEntries []procfs.ARPEntry) map[string]uint32 {
|
|
entries := make(map[string]uint32)
|
|
|
|
for _, device := range deviceEntries {
|
|
entries[device.Device]++
|
|
}
|
|
|
|
return entries
|
|
}
|
|
|
|
func getTotalArpEntriesRTNL() (map[string]uint32, error) {
|
|
conn, err := rtnetlink.Dial(nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer conn.Close()
|
|
|
|
neighbors, err := conn.Neigh.List()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
ifIndexEntries := make(map[uint32]uint32)
|
|
|
|
for _, n := range neighbors {
|
|
// Neighbors will also contain IPv6 neighbors, but since this is purely an ARP collector,
|
|
// restrict to AF_INET. Also skip entries which have state NUD_NOARP to conform to output
|
|
// of /proc/net/arp.
|
|
if n.Family == unix.AF_INET && n.State&unix.NUD_NOARP == 0 {
|
|
ifIndexEntries[n.Index]++
|
|
}
|
|
}
|
|
|
|
enumEntries := make(map[string]uint32)
|
|
|
|
// Convert interface indexes to names.
|
|
for ifIndex, entryCount := range ifIndexEntries {
|
|
iface, err := net.InterfaceByIndex(int(ifIndex))
|
|
if err != nil {
|
|
if errors.Unwrap(err).Error() == "no such network interface" {
|
|
continue
|
|
}
|
|
return nil, err
|
|
}
|
|
|
|
enumEntries[iface.Name] = entryCount
|
|
}
|
|
|
|
return enumEntries, nil
|
|
}
|
|
|
|
func (c *arpCollector) Update(ch chan<- prometheus.Metric) error {
|
|
var enumeratedEntry map[string]uint32
|
|
|
|
if *arpNetlink {
|
|
var err error
|
|
|
|
enumeratedEntry, err = getTotalArpEntriesRTNL()
|
|
if err != nil {
|
|
return fmt.Errorf("could not get ARP entries: %w", err)
|
|
}
|
|
} else {
|
|
entries, err := c.fs.GatherARPEntries()
|
|
if err != nil {
|
|
return fmt.Errorf("could not get ARP entries: %w", err)
|
|
}
|
|
|
|
enumeratedEntry = getTotalArpEntries(entries)
|
|
}
|
|
|
|
for device, entryCount := range enumeratedEntry {
|
|
if c.deviceFilter.ignored(device) {
|
|
continue
|
|
}
|
|
ch <- prometheus.MustNewConstMetric(
|
|
c.entries, prometheus.GaugeValue, float64(entryCount), device)
|
|
}
|
|
|
|
return nil
|
|
}
|