139 lines
3.9 KiB
Go
139 lines
3.9 KiB
Go
// +build linux
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package iptables
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import (
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"errors"
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"os/exec"
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"regexp"
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"strconv"
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"strings"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/plugins/inputs"
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)
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// Iptables is a telegraf plugin to gather packets and bytes throughput from Linux's iptables packet filter.
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type Iptables struct {
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UseSudo bool
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UseLock bool
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Table string
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Chains []string
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lister chainLister
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}
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// Description returns a short description of the plugin.
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func (ipt *Iptables) Description() string {
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return "Gather packets and bytes throughput from iptables"
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}
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// SampleConfig returns sample configuration options.
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func (ipt *Iptables) SampleConfig() string {
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return `
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## iptables require root access on most systems.
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## Setting 'use_sudo' to true will make use of sudo to run iptables.
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## Users must configure sudo to allow telegraf user to run iptables with no password.
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## iptables can be restricted to only list command "iptables -nvL".
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use_sudo = false
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## Setting 'use_lock' to true runs iptables with the "-w" option.
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## Adjust your sudo settings appropriately if using this option ("iptables -wnvl")
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use_lock = false
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## defines the table to monitor:
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table = "filter"
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## defines the chains to monitor.
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## NOTE: iptables rules without a comment will not be monitored.
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## Read the plugin documentation for more information.
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chains = [ "INPUT" ]
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`
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}
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// Gather gathers iptables packets and bytes throughput from the configured tables and chains.
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func (ipt *Iptables) Gather(acc telegraf.Accumulator) error {
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if ipt.Table == "" || len(ipt.Chains) == 0 {
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return nil
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}
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// best effort : we continue through the chains even if an error is encountered,
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// but we keep track of the last error.
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var err error
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for _, chain := range ipt.Chains {
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data, e := ipt.lister(ipt.Table, chain)
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if e != nil {
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err = e
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continue
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}
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e = ipt.parseAndGather(data, acc)
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if e != nil {
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err = e
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continue
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}
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}
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return err
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}
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func (ipt *Iptables) chainList(table, chain string) (string, error) {
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iptablePath, err := exec.LookPath("iptables")
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if err != nil {
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return "", err
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}
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var args []string
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name := iptablePath
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if ipt.UseSudo {
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name = "sudo"
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args = append(args, iptablePath)
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}
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iptablesBaseArgs := "-nvL"
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if ipt.UseLock {
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iptablesBaseArgs = "-wnvL"
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}
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args = append(args, iptablesBaseArgs, chain, "-t", table, "-x")
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c := exec.Command(name, args...)
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out, err := c.Output()
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return string(out), err
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}
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const measurement = "iptables"
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var errParse = errors.New("Cannot parse iptables list information")
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var chainNameRe = regexp.MustCompile(`^Chain\s+(\S+)`)
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var fieldsHeaderRe = regexp.MustCompile(`^\s*pkts\s+bytes\s+`)
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var valuesRe = regexp.MustCompile(`^\s*([0-9]+)\s+([0-9]+)\s+.*?(/\*\s(.*)\s\*/)?$`)
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func (ipt *Iptables) parseAndGather(data string, acc telegraf.Accumulator) error {
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lines := strings.Split(data, "\n")
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if len(lines) < 3 {
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return nil
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}
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mchain := chainNameRe.FindStringSubmatch(lines[0])
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if mchain == nil {
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return errParse
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}
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if !fieldsHeaderRe.MatchString(lines[1]) {
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return errParse
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}
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for _, line := range lines[2:] {
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mv := valuesRe.FindAllStringSubmatch(line, -1)
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// best effort : if line does not match or rule is not commented forget about it
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if len(mv) == 0 || len(mv[0]) != 5 || mv[0][4] == "" {
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continue
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}
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tags := map[string]string{"table": ipt.Table, "chain": mchain[1], "ruleid": mv[0][4]}
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fields := make(map[string]interface{})
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// since parse error is already catched by the regexp,
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// we never enter ther error case here => no error check (but still need a test to cover the case)
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fields["pkts"], _ = strconv.ParseUint(mv[0][1], 10, 64)
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fields["bytes"], _ = strconv.ParseUint(mv[0][2], 10, 64)
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acc.AddFields(measurement, fields, tags)
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}
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return nil
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}
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type chainLister func(table, chain string) (string, error)
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func init() {
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inputs.Add("iptables", func() telegraf.Input {
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ipt := new(Iptables)
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ipt.lister = ipt.chainList
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return ipt
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})
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}
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