Add snmp input plugin

closes #546
closes #40
This commit is contained in:
Thibault Cohen
2016-01-20 15:11:28 -05:00
committed by Cameron Sparr
parent 40d0da404e
commit e6d7e4e309
8 changed files with 972 additions and 2 deletions

473
plugins/inputs/snmp/snmp.go Normal file
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@@ -0,0 +1,473 @@
package snmp
import (
"io/ioutil"
"log"
"net"
"regexp"
"strconv"
"strings"
"time"
"github.com/influxdata/telegraf/plugins/inputs"
"github.com/soniah/gosnmp"
)
// Snmp is a snmp plugin
type Snmp struct {
Host []Host
Get []Data
Bulk []Data
SnmptranslateFile string
}
type Host struct {
Address string
Community string
// SNMP version. Default 2
Version int
// SNMP timeout, in seconds. 0 means no timeout
Timeout float64
// SNMP retries
Retries int
// Data to collect (list of Data names)
Collect []string
// easy get oids
GetOids []string
// Oids
getOids []Data
bulkOids []Data
}
type Data struct {
Name string
// OID (could be numbers or name)
Oid string
// Unit
Unit string
// SNMP getbulk max repetition
MaxRepetition uint8 `toml:"max_repetition"`
// SNMP Instance (default 0)
// (only used with GET request and if
// OID is a name from snmptranslate file)
Instance string
// OID (only number) (used for computation)
rawOid string
}
type Node struct {
id string
name string
subnodes map[string]Node
}
var initNode = Node{
id: "1",
name: "",
subnodes: make(map[string]Node),
}
var NameToOid = make(map[string]string)
var sampleConfig = `
# Use 'oids.txt' file to translate oids to names
# To generate 'oids.txt' you need to run:
# snmptranslate -m all -Tz -On | sed -e 's/"//g' > /tmp/oids.txt
# Or if you have an other MIB folder with custom MIBs
# snmptranslate -M /mycustommibfolder -Tz -On -m all | sed -e 's/"//g' > oids.txt
snmptranslate_file = "/tmp/oids.txt"
[[inputs.snmp.host]]
address = "192.168.2.2:161"
# SNMP community
community = "public" # default public
# SNMP version (1, 2 or 3)
# Version 3 not supported yet
version = 2 # default 2
# SNMP response timeout
timeout = 2.0 # default 2.0
# SNMP request retries
retries = 2 # default 2
# Which get/bulk do you want to collect for this host
collect = ["mybulk", "sysservices", "sysdescr"]
# Simple list of OIDs to get, in addition to "collect"
get_oids = []
[[inputs.snmp.host]]
address = "192.168.2.3:161"
community = "public"
version = 2
timeout = 2.0
retries = 2
collect = ["mybulk"]
get_oids = [
"ifNumber",
".1.3.6.1.2.1.1.3.0",
]
[[inputs.snmp.get]]
name = "ifnumber"
oid = "ifNumber"
[[inputs.snmp.get]]
name = "interface_speed"
oid = "ifSpeed"
instance = 0
[[inputs.snmp.get]]
name = "sysuptime"
oid = ".1.3.6.1.2.1.1.3.0"
unit = "second"
[[inputs.snmp.bulk]]
name = "mybulk"
max_repetition = 127
oid = ".1.3.6.1.2.1.1"
[[inputs.snmp.bulk]]
name = "ifoutoctets"
max_repetition = 127
oid = "ifOutOctets"
`
// SampleConfig returns sample configuration message
func (s *Snmp) SampleConfig() string {
return sampleConfig
}
// Description returns description of Zookeeper plugin
func (s *Snmp) Description() string {
return `Reads oids value from one or many snmp agents`
}
func fillnode(parentNode Node, oid_name string, ids []string) {
// ids = ["1", "3", "6", ...]
id, ids := ids[0], ids[1:]
node, ok := parentNode.subnodes[id]
if ok == false {
node = Node{
id: id,
name: "",
subnodes: make(map[string]Node),
}
if len(ids) == 0 {
node.name = oid_name
}
parentNode.subnodes[id] = node
}
if len(ids) > 0 {
fillnode(node, oid_name, ids)
}
}
func findnodename(node Node, ids []string) (string, string) {
// ids = ["1", "3", "6", ...]
if len(ids) == 1 {
return node.name, ids[0]
}
id, ids := ids[0], ids[1:]
// Get node
subnode, ok := node.subnodes[id]
if ok {
return findnodename(subnode, ids)
}
// We got a node
// Get node name
if node.name != "" && len(ids) == 0 && id == "0" {
// node with instance 0
return node.name, "0"
} else if node.name != "" && len(ids) == 0 && id != "0" {
// node with an instance
return node.name, string(id)
} else if node.name != "" && len(ids) > 0 {
// node with subinstances
return node.name, strings.Join(ids, ".")
}
// return an empty node name
return node.name, ""
}
func (s *Snmp) Gather(acc inputs.Accumulator) error {
// Create oid tree
if s.SnmptranslateFile != "" && len(initNode.subnodes) == 0 {
data, err := ioutil.ReadFile(s.SnmptranslateFile)
if err != nil {
log.Printf("Reading SNMPtranslate file error: %s", err)
return err
} else {
for _, line := range strings.Split(string(data), "\n") {
oidsRegEx := regexp.MustCompile(`([^\t]*)\t*([^\t]*)`)
oids := oidsRegEx.FindStringSubmatch(string(line))
if oids[2] != "" {
oid_name := oids[1]
oid := oids[2]
fillnode(initNode, oid_name, strings.Split(string(oid), "."))
NameToOid[oid_name] = oid
}
}
}
}
// Fetching data
for _, host := range s.Host {
// Set default args
if len(host.Address) == 0 {
host.Address = "127.0.0.1:161"
}
if host.Community == "" {
host.Community = "public"
}
if host.Timeout <= 0 {
host.Timeout = 2.0
}
if host.Retries <= 0 {
host.Retries = 2
}
// Prepare host
// Get Easy GET oids
for _, oidstring := range host.GetOids {
oid := Data{}
if val, ok := NameToOid[oidstring]; ok {
// TODO should we add the 0 instance ?
oid.Name = oidstring
oid.Oid = val
oid.rawOid = "." + val + ".0"
} else {
oid.Name = oidstring
oid.Oid = oidstring
if string(oidstring[:1]) != "." {
oid.rawOid = "." + oidstring
} else {
oid.rawOid = oidstring
}
}
host.getOids = append(host.getOids, oid)
}
for _, oid_name := range host.Collect {
// Get GET oids
for _, oid := range s.Get {
if oid.Name == oid_name {
if val, ok := NameToOid[oid.Oid]; ok {
// TODO should we add the 0 instance ?
if oid.Instance != "" {
oid.rawOid = "." + val + "." + oid.Instance
} else {
oid.rawOid = "." + val + ".0"
}
} else {
oid.rawOid = oid.Oid
}
host.getOids = append(host.getOids, oid)
}
}
// Get GETBULK oids
for _, oid := range s.Bulk {
if oid.Name == oid_name {
if val, ok := NameToOid[oid.Oid]; ok {
oid.rawOid = "." + val
} else {
oid.rawOid = oid.Oid
}
host.bulkOids = append(host.bulkOids, oid)
}
}
}
// Launch Get requests
if err := host.SNMPGet(acc); err != nil {
return err
}
if err := host.SNMPBulk(acc); err != nil {
return err
}
}
return nil
}
func (h *Host) SNMPGet(acc inputs.Accumulator) error {
// Get snmp client
snmpClient, err := h.GetSNMPClient()
if err != nil {
return err
}
// Deconnection
defer snmpClient.Conn.Close()
// Prepare OIDs
oidsList := make(map[string]Data)
for _, oid := range h.getOids {
oidsList[oid.rawOid] = oid
}
oidsNameList := make([]string, 0, len(oidsList))
for _, oid := range oidsList {
oidsNameList = append(oidsNameList, oid.rawOid)
}
// gosnmp.MAX_OIDS == 60
// TODO use gosnmp.MAX_OIDS instead of hard coded value
max_oids := 60
// limit 60 (MAX_OIDS) oids by requests
for i := 0; i < len(oidsList); i = i + max_oids {
// Launch request
max_index := i + max_oids
if i+max_oids > len(oidsList) {
max_index = len(oidsList)
}
result, err3 := snmpClient.Get(oidsNameList[i:max_index]) // Get() accepts up to g.MAX_OIDS
if err3 != nil {
return err3
}
// Handle response
_, err = h.HandleResponse(oidsList, result, acc)
if err != nil {
return err
}
}
return nil
}
func (h *Host) SNMPBulk(acc inputs.Accumulator) error {
// Get snmp client
snmpClient, err := h.GetSNMPClient()
if err != nil {
return err
}
// Deconnection
defer snmpClient.Conn.Close()
// Prepare OIDs
oidsList := make(map[string]Data)
for _, oid := range h.bulkOids {
oidsList[oid.rawOid] = oid
}
oidsNameList := make([]string, 0, len(oidsList))
for _, oid := range oidsList {
oidsNameList = append(oidsNameList, oid.rawOid)
}
// TODO Trying to make requests with more than one OID
// to reduce the number of requests
for _, oid := range oidsNameList {
oid_asked := oid
need_more_requests := true
// Set max repetition
maxRepetition := oidsList[oid].MaxRepetition
if maxRepetition <= 0 {
maxRepetition = 32
}
// Launch requests
for need_more_requests {
// Launch request
result, err3 := snmpClient.GetBulk([]string{oid}, 0, maxRepetition)
if err3 != nil {
return err3
}
// Handle response
last_oid, err := h.HandleResponse(oidsList, result, acc)
if err != nil {
return err
}
// Determine if we need more requests
if strings.HasPrefix(last_oid, oid_asked) {
need_more_requests = true
oid = last_oid
} else {
need_more_requests = false
}
}
}
return nil
}
func (h *Host) GetSNMPClient() (*gosnmp.GoSNMP, error) {
// Prepare Version
var version gosnmp.SnmpVersion
if h.Version == 1 {
version = gosnmp.Version1
} else if h.Version == 3 {
version = gosnmp.Version3
} else {
version = gosnmp.Version2c
}
// Prepare host and port
host, port_str, err := net.SplitHostPort(h.Address)
if err != nil {
port_str = string("161")
}
// convert port_str to port in uint16
port_64, err := strconv.ParseUint(port_str, 10, 16)
port := uint16(port_64)
// Get SNMP client
snmpClient := &gosnmp.GoSNMP{
Target: host,
Port: port,
Community: h.Community,
Version: version,
Timeout: time.Duration(h.Timeout) * time.Second,
Retries: h.Retries,
}
// Connection
err2 := snmpClient.Connect()
if err2 != nil {
return nil, err2
}
// Return snmpClient
return snmpClient, nil
}
func (h *Host) HandleResponse(oids map[string]Data, result *gosnmp.SnmpPacket, acc inputs.Accumulator) (string, error) {
var lastOid string
for _, variable := range result.Variables {
lastOid = variable.Name
// Remove unwanted oid
for oid_key, oid := range oids {
if strings.HasPrefix(variable.Name, oid_key) {
switch variable.Type {
// handle Metrics
case gosnmp.Boolean, gosnmp.Integer, gosnmp.Counter32, gosnmp.Gauge32,
gosnmp.TimeTicks, gosnmp.Counter64, gosnmp.Uinteger32:
// Prepare tags
tags := make(map[string]string)
if oid.Unit != "" {
tags["unit"] = oid.Unit
}
// Get name and instance
var oid_name string
var instance string
// Get oidname and instannce from translate file
oid_name, instance = findnodename(initNode,
strings.Split(string(variable.Name[1:]), "."))
if instance != "" {
tags["instance"] = instance
}
// Set name
var field_name string
if oid_name != "" {
// Set fieldname as oid name from translate file
field_name = oid_name
} else {
// Set fieldname as oid name from inputs.snmp.get section
// Because the result oid is equal to inputs.snmp.get section
field_name = oid.Name
}
tags["host"], _, _ = net.SplitHostPort(h.Address)
fields := make(map[string]interface{})
fields[string(field_name)] = variable.Value
acc.AddFields(field_name, fields, tags)
case gosnmp.NoSuchObject, gosnmp.NoSuchInstance:
// Oid not found
log.Printf("[snmp input] Oid not found: %s", oid_key)
default:
// delete other data
}
break
}
}
}
return lastOid, nil
}
func init() {
inputs.Add("snmp", func() inputs.Input {
return &Snmp{}
})
}

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package snmp
import (
"testing"
"github.com/influxdata/telegraf/testutil"
// "github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestSNMPErrorGet1(t *testing.T) {
get1 := Data{
Name: "oid1",
Unit: "octets",
Oid: ".1.3.6.1.2.1.2.2.1.16.1",
}
h := Host{
Collect: []string{"oid1"},
}
s := Snmp{
SnmptranslateFile: "bad_oid.txt",
Host: []Host{h},
Get: []Data{get1},
}
var acc testutil.Accumulator
err := s.Gather(&acc)
require.Error(t, err)
}
func TestSNMPErrorGet2(t *testing.T) {
get1 := Data{
Name: "oid1",
Unit: "octets",
Oid: ".1.3.6.1.2.1.2.2.1.16.1",
}
h := Host{
Collect: []string{"oid1"},
}
s := Snmp{
Host: []Host{h},
Get: []Data{get1},
}
var acc testutil.Accumulator
err := s.Gather(&acc)
require.Error(t, err)
}
func TestSNMPErrorBulk(t *testing.T) {
bulk1 := Data{
Name: "oid1",
Unit: "octets",
Oid: ".1.3.6.1.2.1.2.2.1.16",
}
h := Host{
Address: "127.0.0.1",
Collect: []string{"oid1"},
}
s := Snmp{
Host: []Host{h},
Bulk: []Data{bulk1},
}
var acc testutil.Accumulator
err := s.Gather(&acc)
require.Error(t, err)
}
func TestSNMPGet1(t *testing.T) {
get1 := Data{
Name: "oid1",
Unit: "octets",
Oid: ".1.3.6.1.2.1.2.2.1.16.1",
}
h := Host{
Address: "127.0.0.1:31161",
Community: "telegraf",
Version: 2,
Timeout: 2.0,
Retries: 2,
Collect: []string{"oid1"},
}
s := Snmp{
Host: []Host{h},
Get: []Data{get1},
}
var acc testutil.Accumulator
err := s.Gather(&acc)
require.NoError(t, err)
acc.AssertContainsTaggedFields(t,
"oid1",
map[string]interface{}{
"oid1": uint(543846),
},
map[string]string{
"unit": "octets",
"host": "127.0.0.1",
},
)
}
func TestSNMPGet2(t *testing.T) {
get1 := Data{
Name: "oid1",
Oid: "ifNumber",
}
h := Host{
Address: "127.0.0.1:31161",
Community: "telegraf",
Version: 2,
Timeout: 2.0,
Retries: 2,
Collect: []string{"oid1"},
}
s := Snmp{
SnmptranslateFile: "./testdata/oids.txt",
Host: []Host{h},
Get: []Data{get1},
}
var acc testutil.Accumulator
err := s.Gather(&acc)
require.NoError(t, err)
acc.AssertContainsTaggedFields(t,
"ifNumber",
map[string]interface{}{
"ifNumber": int(4),
},
map[string]string{
"instance": "0",
"host": "127.0.0.1",
},
)
}
func TestSNMPGet3(t *testing.T) {
get1 := Data{
Name: "oid1",
Unit: "octets",
Oid: "ifSpeed",
Instance: "1",
}
h := Host{
Address: "127.0.0.1:31161",
Community: "telegraf",
Version: 2,
Timeout: 2.0,
Retries: 2,
Collect: []string{"oid1"},
}
s := Snmp{
SnmptranslateFile: "./testdata/oids.txt",
Host: []Host{h},
Get: []Data{get1},
}
var acc testutil.Accumulator
err := s.Gather(&acc)
require.NoError(t, err)
acc.AssertContainsTaggedFields(t,
"ifSpeed",
map[string]interface{}{
"ifSpeed": uint(10000000),
},
map[string]string{
"unit": "octets",
"instance": "1",
"host": "127.0.0.1",
},
)
}
func TestSNMPEasyGet4(t *testing.T) {
get1 := Data{
Name: "oid1",
Unit: "octets",
Oid: "ifSpeed",
Instance: "1",
}
h := Host{
Address: "127.0.0.1:31161",
Community: "telegraf",
Version: 2,
Timeout: 2.0,
Retries: 2,
Collect: []string{"oid1"},
GetOids: []string{"ifNumber"},
}
s := Snmp{
SnmptranslateFile: "./testdata/oids.txt",
Host: []Host{h},
Get: []Data{get1},
}
var acc testutil.Accumulator
err := s.Gather(&acc)
require.NoError(t, err)
acc.AssertContainsTaggedFields(t,
"ifSpeed",
map[string]interface{}{
"ifSpeed": uint(10000000),
},
map[string]string{
"unit": "octets",
"instance": "1",
"host": "127.0.0.1",
},
)
acc.AssertContainsTaggedFields(t,
"ifNumber",
map[string]interface{}{
"ifNumber": int(4),
},
map[string]string{
"instance": "0",
"host": "127.0.0.1",
},
)
}
func TestSNMPEasyGet5(t *testing.T) {
get1 := Data{
Name: "oid1",
Unit: "octets",
Oid: "ifSpeed",
Instance: "1",
}
h := Host{
Address: "127.0.0.1:31161",
Community: "telegraf",
Version: 2,
Timeout: 2.0,
Retries: 2,
Collect: []string{"oid1"},
GetOids: []string{".1.3.6.1.2.1.2.1.0"},
}
s := Snmp{
SnmptranslateFile: "./testdata/oids.txt",
Host: []Host{h},
Get: []Data{get1},
}
var acc testutil.Accumulator
err := s.Gather(&acc)
require.NoError(t, err)
acc.AssertContainsTaggedFields(t,
"ifSpeed",
map[string]interface{}{
"ifSpeed": uint(10000000),
},
map[string]string{
"unit": "octets",
"instance": "1",
"host": "127.0.0.1",
},
)
acc.AssertContainsTaggedFields(t,
"ifNumber",
map[string]interface{}{
"ifNumber": int(4),
},
map[string]string{
"instance": "0",
"host": "127.0.0.1",
},
)
}
func TestSNMPEasyGet6(t *testing.T) {
h := Host{
Address: "127.0.0.1:31161",
Community: "telegraf",
Version: 2,
Timeout: 2.0,
Retries: 2,
GetOids: []string{"1.3.6.1.2.1.2.1.0"},
}
s := Snmp{
SnmptranslateFile: "./testdata/oids.txt",
Host: []Host{h},
}
var acc testutil.Accumulator
err := s.Gather(&acc)
require.NoError(t, err)
acc.AssertContainsTaggedFields(t,
"ifNumber",
map[string]interface{}{
"ifNumber": int(4),
},
map[string]string{
"instance": "0",
"host": "127.0.0.1",
},
)
}
func TestSNMPBulk1(t *testing.T) {
bulk1 := Data{
Name: "oid1",
Unit: "octets",
Oid: ".1.3.6.1.2.1.2.2.1.16",
MaxRepetition: 2,
}
h := Host{
Address: "127.0.0.1:31161",
Community: "telegraf",
Version: 2,
Timeout: 2.0,
Retries: 2,
Collect: []string{"oid1"},
}
s := Snmp{
SnmptranslateFile: "./testdata/oids.txt",
Host: []Host{h},
Bulk: []Data{bulk1},
}
var acc testutil.Accumulator
err := s.Gather(&acc)
require.NoError(t, err)
acc.AssertContainsTaggedFields(t,
"ifOutOctets",
map[string]interface{}{
"ifOutOctets": uint(543846),
},
map[string]string{
"unit": "octets",
"instance": "1",
"host": "127.0.0.1",
},
)
acc.AssertContainsTaggedFields(t,
"ifOutOctets",
map[string]interface{}{
"ifOutOctets": uint(26475179),
},
map[string]string{
"unit": "octets",
"instance": "2",
"host": "127.0.0.1",
},
)
acc.AssertContainsTaggedFields(t,
"ifOutOctets",
map[string]interface{}{
"ifOutOctets": uint(108963968),
},
map[string]string{
"unit": "octets",
"instance": "3",
"host": "127.0.0.1",
},
)
acc.AssertContainsTaggedFields(t,
"ifOutOctets",
map[string]interface{}{
"ifOutOctets": uint(12991453),
},
map[string]string{
"unit": "octets",
"instance": "36",
"host": "127.0.0.1",
},
)
}
// TODO find why, if this test is active
// Circle CI stops with the following error...
// bash scripts/circle-test.sh died unexpectedly
// Maybe the test is too long ??
func dTestSNMPBulk2(t *testing.T) {
bulk1 := Data{
Name: "oid1",
Unit: "octets",
Oid: "ifOutOctets",
MaxRepetition: 2,
}
h := Host{
Address: "127.0.0.1:31161",
Community: "telegraf",
Version: 2,
Timeout: 2.0,
Retries: 2,
Collect: []string{"oid1"},
}
s := Snmp{
SnmptranslateFile: "./testdata/oids.txt",
Host: []Host{h},
Bulk: []Data{bulk1},
}
var acc testutil.Accumulator
err := s.Gather(&acc)
require.NoError(t, err)
acc.AssertContainsTaggedFields(t,
"ifOutOctets",
map[string]interface{}{
"ifOutOctets": uint(543846),
},
map[string]string{
"unit": "octets",
"instance": "1",
"host": "127.0.0.1",
},
)
acc.AssertContainsTaggedFields(t,
"ifOutOctets",
map[string]interface{}{
"ifOutOctets": uint(26475179),
},
map[string]string{
"unit": "octets",
"instance": "2",
"host": "127.0.0.1",
},
)
acc.AssertContainsTaggedFields(t,
"ifOutOctets",
map[string]interface{}{
"ifOutOctets": uint(108963968),
},
map[string]string{
"unit": "octets",
"instance": "3",
"host": "127.0.0.1",
},
)
acc.AssertContainsTaggedFields(t,
"ifOutOctets",
map[string]interface{}{
"ifOutOctets": uint(12991453),
},
map[string]string{
"unit": "octets",
"instance": "36",
"host": "127.0.0.1",
},
)
}

32
plugins/inputs/snmp/testdata/oids.txt vendored Normal file
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@@ -0,0 +1,32 @@
org 1.3
dod 1.3.6
internet 1.3.6.1
directory 1.3.6.1.1
mgmt 1.3.6.1.2
mib-2 1.3.6.1.2.1
interfaces 1.3.6.1.2.1.2
ifNumber 1.3.6.1.2.1.2.1
ifTable 1.3.6.1.2.1.2.2
ifEntry 1.3.6.1.2.1.2.2.1
ifIndex 1.3.6.1.2.1.2.2.1.1
ifDescr 1.3.6.1.2.1.2.2.1.2
ifType 1.3.6.1.2.1.2.2.1.3
ifMtu 1.3.6.1.2.1.2.2.1.4
ifSpeed 1.3.6.1.2.1.2.2.1.5
ifPhysAddress 1.3.6.1.2.1.2.2.1.6
ifAdminStatus 1.3.6.1.2.1.2.2.1.7
ifOperStatus 1.3.6.1.2.1.2.2.1.8
ifLastChange 1.3.6.1.2.1.2.2.1.9
ifInOctets 1.3.6.1.2.1.2.2.1.10
ifInUcastPkts 1.3.6.1.2.1.2.2.1.11
ifInNUcastPkts 1.3.6.1.2.1.2.2.1.12
ifInDiscards 1.3.6.1.2.1.2.2.1.13
ifInErrors 1.3.6.1.2.1.2.2.1.14
ifInUnknownProtos 1.3.6.1.2.1.2.2.1.15
ifOutOctets 1.3.6.1.2.1.2.2.1.16
ifOutUcastPkts 1.3.6.1.2.1.2.2.1.17
ifOutNUcastPkts 1.3.6.1.2.1.2.2.1.18
ifOutDiscards 1.3.6.1.2.1.2.2.1.19
ifOutErrors 1.3.6.1.2.1.2.2.1.20
ifOutQLen 1.3.6.1.2.1.2.2.1.21
ifSpecific 1.3.6.1.2.1.2.2.1.22