120 lines
2.6 KiB
Go
120 lines
2.6 KiB
Go
// +build linux
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package conntrack
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import (
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"fmt"
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"io/ioutil"
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"os"
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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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"path/filepath"
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)
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type Conntrack struct {
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Path string
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Dirs []string
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Files []string
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}
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const (
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inputName = "conntrack"
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)
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var dfltDirs = []string{
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"/proc/sys/net/ipv4/netfilter",
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"/proc/sys/net/netfilter",
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}
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var dfltFiles = []string{
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"ip_conntrack_count",
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"ip_conntrack_max",
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"nf_conntrack_count",
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"nf_conntrack_max",
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}
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func (c *Conntrack) setDefaults() {
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if len(c.Dirs) == 0 {
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c.Dirs = dfltDirs
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}
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if len(c.Files) == 0 {
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c.Files = dfltFiles
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}
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}
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func (c *Conntrack) Description() string {
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return "Collects conntrack stats from the configured directories and files."
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}
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var sampleConfig = `
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## The following defaults would work with multiple versions of conntrack.
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## Note the nf_ and ip_ filename prefixes are mutually exclusive across
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## kernel versions, as are the directory locations.
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## Superset of filenames to look for within the conntrack dirs.
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## Missing files will be ignored.
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files = ["ip_conntrack_count","ip_conntrack_max",
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"nf_conntrack_count","nf_conntrack_max"]
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## Directories to search within for the conntrack files above.
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## Missing directrories will be ignored.
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dirs = ["/proc/sys/net/ipv4/netfilter","/proc/sys/net/netfilter"]
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`
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func (c *Conntrack) SampleConfig() string {
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return sampleConfig
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}
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func (c *Conntrack) Gather(acc telegraf.Accumulator) error {
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c.setDefaults()
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var metricKey string
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fields := make(map[string]interface{})
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for _, dir := range c.Dirs {
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for _, file := range c.Files {
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// NOTE: no system will have both nf_ and ip_ prefixes,
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// so we're safe to branch on suffix only.
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parts := strings.SplitN(file, "_", 2)
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if len(parts) < 2 {
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continue
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}
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metricKey = "ip_" + parts[1]
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fName := filepath.Join(dir, file)
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if _, err := os.Stat(fName); err != nil {
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continue
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}
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contents, err := ioutil.ReadFile(fName)
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if err != nil {
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acc.AddError(fmt.Errorf("E! failed to read file '%s': %v", fName, err))
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continue
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}
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v := strings.TrimSpace(string(contents))
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fields[metricKey], err = strconv.ParseFloat(v, 64)
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if err != nil {
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acc.AddError(fmt.Errorf("E! failed to parse metric, expected number but "+
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" found '%s': %v", v, err))
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}
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}
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}
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if len(fields) == 0 {
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return fmt.Errorf("Conntrack input failed to collect metrics. " +
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"Is the conntrack kernel module loaded?")
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}
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acc.AddFields(inputName, fields, nil)
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return nil
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}
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func init() {
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inputs.Add(inputName, func() telegraf.Input { return &Conntrack{} })
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}
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