Completely refactor snmp plugin
- use snmpget/snmpwalk terminology - use snmptranslate to get MIBs
This commit is contained in:
Cameron Sparr
parent
aa86a535cb
commit
86a9a44c7e
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@ -1397,35 +1397,49 @@
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# #priv_protocol = "" # Values: "DES", "AES", ""
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# #priv_password = ""
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#
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# ## measurement name
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# name = "system"
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# ## SNMP fields are gotten by using an "snmpget" request. If a name is not
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# ## specified, we attempt to use snmptranslate on the OID to get the MIB name.
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# [[inputs.snmp.field]]
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# name = "hostname"
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# oid = ".1.2.3.0.1.1"
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# [[inputs.snmp.field]]
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# name = "uptime"
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# oid = ".1.2.3.0.1.200"
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# [[inputs.snmp.field]]
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# oid = ".1.2.3.0.1.201"
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# ## Each 'tag' is an "snmpget" request. Tags are inherited by snmp 'walk'
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# ## and 'get' requests specified below. If a name for the tag is not provided,
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# ## we will attempt to use snmptranslate on the OID to get the MIB name.
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# [[inputs.snmp.tag]]
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# name = "sys_name" # optional, tag name
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# oid = ".1.3.6.1.2.1.1.5.0"
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# [[inputs.snmp.tag]]
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# name = "sys_location"
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# oid = ".1.3.6.1.2.1.1.6.0"
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#
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# [[inputs.snmp.table]]
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# ## measurement name
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# name = "remote_servers"
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# inherit_tags = ["hostname"]
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# ## SNMP table fields must be specified individually. If the table field has
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# ## multiple rows, they will all be gotten.
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# [[inputs.snmp.table.field]]
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# name = "server"
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# oid = ".1.2.3.0.0.0"
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# is_tag = true
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# [[inputs.snmp.table.field]]
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# name = "connections"
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# oid = ".1.2.3.0.0.1"
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# [[inputs.snmp.table.field]]
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# name = "latency"
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# oid = ".1.2.3.0.0.2"
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# ## optional, name of the measurement that each 'get' field will be under.
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# name = "snmp"
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# ## Each 'get' is an "snmpget" request. If a name for the field is not provided,
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# ## we will attempt to use snmptranslate on the OID to get the MIB name.
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# [[inputs.snmp.get]]
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# name = "snmp_in_packets" # optional, field name
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# oid = ".1.3.6.1.2.1.11.1.0"
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# [[inputs.snmp.get]]
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# oid = ".1.3.6.1.2.1.11.2.0"
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#
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# ## An SNMP walk will do an "snmpwalk" from the given root OID.
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# ## Each OID it encounters will be converted into a field on the measurement.
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# ## We will attempt to use snmptranslate on the OID to get the MIB names for
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# ## each field.
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# [[inputs.snmp.walk]]
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# ## optional, inherit_tags specifies which top-level tags to inherit.
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# ## Globs are supported.
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# inherit_tags = ["sys_*"]
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# name = "snmp_metrics" # measurement name
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# root_oid = ".1.3.6.1.2.1.11"
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#
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# [[inputs.snmp.walk]]
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# ## optional, 'include' specifies MIB names to include in the walk.
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# ## 'exclude' is also available, although they're mutually-exclusive.
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# ## Globs are supported.
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# include = ["if*"]
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# name = "ifTable"
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# root_oid = ".1.3.6.1.2.1.2.2"
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#
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# [[inputs.snmp.walk]]
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# exclude = ["ifAlias"]
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# name = "ifXTable"
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# root_oid = ".1.3.6.1.2.1.31.1.1"
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# # DEPRECATED: This will be removed in a future release.
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@ -0,0 +1,66 @@
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package snmp
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import (
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"fmt"
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"github.com/soniah/gosnmp"
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)
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// snmpConnection is an interface which wraps a *gosnmp.GoSNMP object.
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// We interact through an interface so we can mock it out in tests.
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type snmpConnection interface {
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Host() string
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//BulkWalkAll(string) ([]gosnmp.SnmpPDU, error)
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Walk(string, gosnmp.WalkFunc) error
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Get(oids []string) (*gosnmp.SnmpPacket, error)
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}
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// gosnmpWrapper wraps a *gosnmp.GoSNMP object so we can use it as a snmpConnection.
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type gosnmpWrapper struct {
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*gosnmp.GoSNMP
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}
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// Host returns the value of GoSNMP.Target.
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func (gsw gosnmpWrapper) Host() string {
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return gsw.Target
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}
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// Walk wraps GoSNMP.Walk() or GoSNMP.BulkWalk(), depending on whether the
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// connection is using SNMPv1 or newer.
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// Also, if any error is encountered, it will just once reconnect and try again.
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func (gsw gosnmpWrapper) Walk(oid string, fn gosnmp.WalkFunc) error {
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var err error
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// On error, retry once.
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// Unfortunately we can't distinguish between an error returned by gosnmp, and one returned by the walk function.
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for i := 0; i < 2; i++ {
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if gsw.Version == gosnmp.Version1 {
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err = gsw.GoSNMP.Walk(oid, fn)
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} else {
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err = gsw.GoSNMP.BulkWalk(oid, fn)
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}
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if err == nil {
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return nil
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}
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if err := gsw.GoSNMP.Connect(); err != nil {
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return fmt.Errorf("reconnecting %s", err)
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}
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}
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return err
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}
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// Get wraps GoSNMP.GET().
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// If any error is encountered, it will just once reconnect and try again.
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func (gsw gosnmpWrapper) Get(oids []string) (*gosnmp.SnmpPacket, error) {
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var err error
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var pkt *gosnmp.SnmpPacket
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for i := 0; i < 2; i++ {
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pkt, err = gsw.GoSNMP.Get(oids)
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if err == nil {
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return pkt, nil
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}
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if err := gsw.GoSNMP.Connect(); err != nil {
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return nil, fmt.Errorf("reconnecting %s", err)
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}
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}
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return nil, err
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}
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@ -2,7 +2,6 @@ package snmp
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import (
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"fmt"
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"math"
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"net"
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"os/exec"
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"strconv"
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@ -10,6 +9,7 @@ import (
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"time"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/filter"
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"github.com/influxdata/telegraf/internal"
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"github.com/influxdata/telegraf/plugins/inputs"
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@ -36,35 +36,48 @@ const sampleConfig = `
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#priv_protocol = "" # Values: "DES", "AES", ""
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#priv_password = ""
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## measurement name
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name = "system"
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## SNMP fields are gotten by using an "snmpget" request. If a name is not
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## specified, we attempt to use snmptranslate on the OID to get the MIB name.
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[[inputs.snmp.field]]
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name = "hostname"
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oid = ".1.2.3.0.1.1"
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[[inputs.snmp.field]]
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name = "uptime"
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oid = ".1.2.3.0.1.200"
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[[inputs.snmp.field]]
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oid = ".1.2.3.0.1.201"
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## Each 'tag' is an "snmpget" request. Tags are inherited by snmp 'walk'
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## and 'get' requests specified below. If a name for the tag is not provided,
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## we will attempt to get the MIB name.
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[[inputs.snmp.tag]]
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name = "sys_name" # optional, tag name
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oid = ".1.3.6.1.2.1.1.5.0"
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[[inputs.snmp.tag]]
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name = "sys_location"
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oid = ".1.3.6.1.2.1.1.6.0"
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[[inputs.snmp.table]]
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## measurement name
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name = "remote_servers"
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inherit_tags = ["hostname"]
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## SNMP table fields must be specified individually. If the table field has
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## multiple rows, they will all be gotten.
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[[inputs.snmp.table.field]]
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name = "server"
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oid = ".1.2.3.0.0.0"
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is_tag = true
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[[inputs.snmp.table.field]]
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name = "connections"
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oid = ".1.2.3.0.0.1"
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[[inputs.snmp.table.field]]
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name = "latency"
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oid = ".1.2.3.0.0.2"
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## optional, name of the measurement that each 'get' field will be under.
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name = "snmp"
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## Each 'get' is an "snmpget" request. If a name for the field is not provided,
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## we will attempt to get the MIB name.
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[[inputs.snmp.get]]
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name = "snmp_in_packets" # optional, field name
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oid = ".1.3.6.1.2.1.11.1.0"
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[[inputs.snmp.get]]
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oid = ".1.3.6.1.2.1.11.2.0"
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## An SNMP walk will do an "snmpwalk" from the given root OID.
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## Each OID it encounters will be converted into a field on the measurement.
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## We will attempt to get the MIB names for each field.
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[[inputs.snmp.walk]]
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## optional, inherit_tags specifies which top-level tags to inherit.
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## Globs are supported.
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inherit_tags = ["sys_*"]
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name = "snmp_metrics" # measurement name
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root_oid = ".1.3.6.1.2.1.11"
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[[inputs.snmp.walk]]
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## optional, 'include' specifies MIB names to include in the walk.
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## 'exclude' is also available, although they're mutually-exclusive.
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## Globs are supported.
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include = ["if*"]
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name = "ifTable"
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root_oid = ".1.3.6.1.2.1.2.2"
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[[inputs.snmp.walk]]
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exclude = ["ifAlias"]
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name = "ifXTable"
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root_oid = ".1.3.6.1.2.1.31.1.1"
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`
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// Snmp holds the configuration for the plugin.
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@ -94,106 +107,59 @@ type Snmp struct {
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// Values: "DES", "AES", "". Default: ""
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PrivProtocol string
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PrivPassword string
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EngineID string
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EngineBoots uint32
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EngineTime uint32
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Tables []Table `toml:"table"`
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// Name & Fields are the elements of a Table.
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// Telegraf chokes if we try to embed a Table. So instead we have to embed the
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// fields of a Table, and construct a Table during runtime.
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Name string
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Fields []Field `toml:"field"`
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// Telegraf chokes if we try to embed a Table. So instead we have to embed
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// the fields of a Table, and construct a Table during runtime.
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Name string
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Gets []Get `toml:"get"`
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Walks []Walk `toml:"walk"`
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Tags []Tag `toml:"tag"`
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// oidToMib is a map of OIDs to MIBs.
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oidToMib map[string]string
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// translateBin is the location of the 'snmptranslate' binary.
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translateBin string
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connectionCache map[string]snmpConnection
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inited bool
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}
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// Table holds the configuration for a SNMP table.
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type Table struct {
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// Name will be the name of the measurement.
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Name string
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// Which tags to inherit from the top-level config.
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InheritTags []string
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// Fields is the tags and values to look up.
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Fields []Field `toml:"field"`
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}
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// Field holds the configuration for a Field to look up.
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type Field struct {
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// Get holds the configuration for a Get to look up.
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type Get struct {
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// Name will be the name of the field.
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Name string
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// OID is prefix for this field.
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Oid string
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}
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// Walker holds the configuration for a Walker to look up.
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type Walk struct {
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// Name will be the name of the measurement.
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Name string
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// OID is prefix for this field. The plugin will perform a walk through all
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// OIDs with this as their parent. For each value found, the plugin will strip
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// off the OID prefix, and use the remainder as the index. For multiple fields
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// to show up in the same row, they must share the same index.
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Oid string
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// IsTag controls whether this OID is output as a tag or a value.
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IsTag bool
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// Conversion controls any type conversion that is done on the value.
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// "float"/"float(0)" will convert the value into a float.
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// "float(X)" will convert the value into a float, and then move the decimal before Xth right-most digit.
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// "int" will conver the value into an integer.
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Conversion string
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RootOid string
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// Include is a list of glob filters, only OID/MIBs that match these will
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// be included in the resulting output metrics.
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Include []string
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include filter.Filter
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// Exclude is the exact opposite of Include
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Exclude []string
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exclude filter.Filter
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// InheritTags is a list of tags to inherit from the top-level snmp.tag
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// configuration.
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InheritTags []string
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inheritTags filter.Filter
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}
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// RTable is the resulting table built from a Table.
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type RTable struct {
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// Name is the name of the field, copied from Table.Name.
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// Tag holds the config for a tag.
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type Tag struct {
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// Name will be the name of the tag.
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Name string
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// Time is the time the table was built.
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Time time.Time
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// Rows are the rows that were found, one row for each table OID index found.
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Rows []RTableRow
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}
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// RTableRow is the resulting row containing all the OID values which shared
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// the same index.
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type RTableRow struct {
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// Tags are all the Field values which had IsTag=true.
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Tags map[string]string
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// Fields are all the Field values which had IsTag=false.
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Fields map[string]interface{}
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}
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// Errors is a list of errors accumulated during an interval.
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type Errors []error
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func (errs Errors) Error() string {
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s := ""
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for _, err := range errs {
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if s == "" {
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s = err.Error()
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} else {
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s = s + ". " + err.Error()
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}
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}
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return s
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}
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// NestedError wraps an error returned from deeper in the code.
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type NestedError struct {
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// Err is the error from where the NestedError was constructed.
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Err error
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// NestedError is the error that was passed back from the called function.
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NestedErr error
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}
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// Error returns a concatenated string of all the nested errors.
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func (ne NestedError) Error() string {
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return ne.Err.Error() + ": " + ne.NestedErr.Error()
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}
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// Errorf is a convenience function for constructing a NestedError.
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func Errorf(err error, msg string, format ...interface{}) error {
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return NestedError{
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NestedErr: err,
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Err: fmt.Errorf(msg, format...),
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}
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// OID is prefix for this field.
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Oid string
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}
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// SampleConfig returns the default configuration of the input.
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@ -210,258 +176,150 @@ func (s *Snmp) Description() string {
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// Any error encountered does not halt the process. The errors are accumulated
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// and returned at the end.
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func (s *Snmp) Gather(acc telegraf.Accumulator) error {
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if !s.inited {
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s.initOidNames()
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}
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s.inited = true
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var errs Errors
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for _, agent := range s.Agents {
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gs, err := s.getConnection(agent)
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if err != nil {
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errs = append(errs, Errorf(err, "agent %s", agent))
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acc.AddError(fmt.Errorf("Agent %s, err: %s", agent, err))
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continue
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}
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// First is the top-level fields. We treat the fields as table prefixes with an empty index.
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t := Table{
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Name: s.Name,
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Fields: s.Fields,
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}
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topTags := map[string]string{}
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if err := s.gatherTable(acc, gs, t, topTags, false); err != nil {
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errs = append(errs, Errorf(err, "agent %s", agent))
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}
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// Now is the real tables.
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for _, t := range s.Tables {
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if err := s.gatherTable(acc, gs, t, topTags, true); err != nil {
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errs = append(errs, Errorf(err, "agent %s", agent))
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}
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}
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}
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if errs == nil {
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return nil
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}
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return errs
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}
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// initOidNames loops through each [[inputs.snmp.field]] defined.
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// If the field doesn't have a 'name' defined, it will attempt to use
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// snmptranslate to get a name for the OID. If snmptranslate doesn't return a
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// name, or snmptranslate is not available, then use the OID as the name.
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func (s *Snmp) initOidNames() {
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bin, _ := exec.LookPath("snmptranslate")
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// Lookup names for each OID defined as a "field"
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for i, field := range s.Fields {
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if field.Name != "" {
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continue
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}
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s.Fields[i].Name = lookupOidName(bin, field.Oid)
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}
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// Lookup names for each OID defined as a "table.field"
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for i, table := range s.Tables {
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for j, field := range table.Fields {
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if field.Name != "" {
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// Gather all snmp tags
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for _, t := range s.Tags {
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tagval, err := get(gs, t.Oid)
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if err != nil {
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acc.AddError(fmt.Errorf("Agent %s, err: %s", agent, err))
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continue
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||||
}
|
||||
s.Tables[i].Fields[j].Name = lookupOidName(bin, field.Oid)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func lookupOidName(bin, oid string) string {
|
||||
name := oid
|
||||
if bin != "" {
|
||||
out, err := internal.CombinedOutputTimeout(
|
||||
exec.Command(bin, "-Os", oid),
|
||||
time.Millisecond*250)
|
||||
if err == nil && len(out) > 0 {
|
||||
name = strings.TrimSpace(string(out))
|
||||
}
|
||||
}
|
||||
return name
|
||||
}
|
||||
|
||||
func (s *Snmp) gatherTable(
|
||||
acc telegraf.Accumulator,
|
||||
gs snmpConnection,
|
||||
t Table,
|
||||
topTags map[string]string,
|
||||
walk bool,
|
||||
) error {
|
||||
rt, err := t.Build(gs, walk)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
for _, tr := range rt.Rows {
|
||||
if !walk {
|
||||
// top-level table. Add tags to topTags.
|
||||
for k, v := range tr.Tags {
|
||||
topTags[k] = v
|
||||
if tagval == nil {
|
||||
continue
|
||||
}
|
||||
} else {
|
||||
// real table. Inherit any specified tags.
|
||||
for _, k := range t.InheritTags {
|
||||
if v, ok := topTags[k]; ok {
|
||||
tr.Tags[k] = v
|
||||
}
|
||||
name := t.Name
|
||||
if name == "" {
|
||||
name, _ = s.getMibName(t.Oid)
|
||||
}
|
||||
if s, ok := tagval.(string); ok {
|
||||
topTags[name] = s
|
||||
}
|
||||
}
|
||||
if _, ok := tr.Tags["agent_host"]; !ok {
|
||||
tr.Tags["agent_host"] = gs.Host()
|
||||
|
||||
// Gather all snmp gets
|
||||
fields := map[string]interface{}{}
|
||||
for _, g := range s.Gets {
|
||||
val, err := get(gs, g.Oid)
|
||||
if err != nil {
|
||||
acc.AddError(fmt.Errorf("Agent %s, err: %s", agent, err))
|
||||
continue
|
||||
}
|
||||
if val == nil {
|
||||
continue
|
||||
}
|
||||
name := g.Name
|
||||
if name == "" {
|
||||
name, _ = s.getMibName(g.Oid)
|
||||
}
|
||||
fields[name] = val
|
||||
}
|
||||
if len(fields) > 0 {
|
||||
acc.AddFields(s.Name, fields, topTags, time.Now())
|
||||
}
|
||||
|
||||
// Gather all snmp walks
|
||||
for _, w := range s.Walks {
|
||||
w.compileWalkFilters(acc)
|
||||
allfields := map[string]map[string]interface{}{}
|
||||
now := time.Now()
|
||||
s.walk(gs, allfields, w.RootOid, w.include, w.exclude)
|
||||
for index, wfields := range allfields {
|
||||
tags := copyTags(topTags, w.inheritTags)
|
||||
tags["index"] = index
|
||||
acc.AddFields(w.Name, wfields, tags, now)
|
||||
}
|
||||
}
|
||||
acc.AddFields(rt.Name, tr.Fields, tr.Tags, rt.Time)
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// Build retrieves all the fields specified in the table and constructs the RTable.
|
||||
func (t Table) Build(gs snmpConnection, walk bool) (*RTable, error) {
|
||||
rows := map[string]RTableRow{}
|
||||
|
||||
tagCount := 0
|
||||
for _, f := range t.Fields {
|
||||
if f.IsTag {
|
||||
tagCount++
|
||||
}
|
||||
|
||||
if len(f.Oid) == 0 {
|
||||
return nil, fmt.Errorf("cannot have empty OID")
|
||||
}
|
||||
var oid string
|
||||
if f.Oid[0] == '.' {
|
||||
oid = f.Oid
|
||||
} else {
|
||||
// make sure OID has "." because the BulkWalkAll results do, and the prefix needs to match
|
||||
oid = "." + f.Oid
|
||||
}
|
||||
|
||||
// ifv contains a mapping of table OID index to field value
|
||||
ifv := map[string]interface{}{}
|
||||
if !walk {
|
||||
// This is used when fetching non-table fields. Fields configured a the top
|
||||
// scope of the plugin.
|
||||
// We fetch the fields directly, and add them to ifv as if the index were an
|
||||
// empty string. This results in all the non-table fields sharing the same
|
||||
// index, and being added on the same row.
|
||||
if pkt, err := gs.Get([]string{oid}); err != nil {
|
||||
return nil, Errorf(err, "performing get")
|
||||
} else if pkt != nil && len(pkt.Variables) > 0 && pkt.Variables[0].Type != gosnmp.NoSuchObject {
|
||||
ent := pkt.Variables[0]
|
||||
ifv[ent.Name[len(oid):]] = fieldConvert(f.Conversion, ent.Value)
|
||||
}
|
||||
} else {
|
||||
err := gs.Walk(oid, func(ent gosnmp.SnmpPDU) error {
|
||||
if len(ent.Name) <= len(oid) || ent.Name[:len(oid)+1] != oid+"." {
|
||||
return NestedError{} // break the walk
|
||||
}
|
||||
ifv[ent.Name[len(oid):]] = fieldConvert(f.Conversion, ent.Value)
|
||||
// walk does a walk and populates the given 'fields' map with whatever it finds.
|
||||
// as it goes, it attempts to lookup the MIB name of each OID it encounters.
|
||||
func (s *Snmp) walk(
|
||||
gs snmpConnection,
|
||||
fields map[string]map[string]interface{},
|
||||
rootOid string,
|
||||
include filter.Filter,
|
||||
exclude filter.Filter,
|
||||
) {
|
||||
gs.Walk(rootOid, func(ent gosnmp.SnmpPDU) error {
|
||||
name, index := s.getMibName(ent.Name)
|
||||
if include != nil {
|
||||
if !include.Match(name) {
|
||||
return nil
|
||||
}
|
||||
} else if exclude != nil {
|
||||
if exclude.Match(name) {
|
||||
return nil
|
||||
})
|
||||
if err != nil {
|
||||
if _, ok := err.(NestedError); !ok {
|
||||
return nil, Errorf(err, "performing bulk walk")
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
for i, v := range ifv {
|
||||
rtr, ok := rows[i]
|
||||
if !ok {
|
||||
rtr = RTableRow{}
|
||||
rtr.Tags = map[string]string{}
|
||||
rtr.Fields = map[string]interface{}{}
|
||||
rows[i] = rtr
|
||||
}
|
||||
if f.IsTag {
|
||||
if vs, ok := v.(string); ok {
|
||||
rtr.Tags[f.Name] = vs
|
||||
} else {
|
||||
rtr.Tags[f.Name] = fmt.Sprintf("%v", v)
|
||||
}
|
||||
} else {
|
||||
rtr.Fields[f.Name] = v
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
rt := RTable{
|
||||
Name: t.Name,
|
||||
Time: time.Now(), //TODO record time at start
|
||||
Rows: make([]RTableRow, 0, len(rows)),
|
||||
}
|
||||
for _, r := range rows {
|
||||
if len(r.Tags) < tagCount {
|
||||
// don't add rows which are missing tags, as without tags you can't filter
|
||||
continue
|
||||
}
|
||||
rt.Rows = append(rt.Rows, r)
|
||||
}
|
||||
return &rt, nil
|
||||
}
|
||||
|
||||
// snmpConnection is an interface which wraps a *gosnmp.GoSNMP object.
|
||||
// We interact through an interface so we can mock it out in tests.
|
||||
type snmpConnection interface {
|
||||
Host() string
|
||||
//BulkWalkAll(string) ([]gosnmp.SnmpPDU, error)
|
||||
Walk(string, gosnmp.WalkFunc) error
|
||||
Get(oids []string) (*gosnmp.SnmpPacket, error)
|
||||
}
|
||||
|
||||
// gosnmpWrapper wraps a *gosnmp.GoSNMP object so we can use it as a snmpConnection.
|
||||
type gosnmpWrapper struct {
|
||||
*gosnmp.GoSNMP
|
||||
}
|
||||
|
||||
// Host returns the value of GoSNMP.Target.
|
||||
func (gsw gosnmpWrapper) Host() string {
|
||||
return gsw.Target
|
||||
}
|
||||
|
||||
// Walk wraps GoSNMP.Walk() or GoSNMP.BulkWalk(), depending on whether the
|
||||
// connection is using SNMPv1 or newer.
|
||||
// Also, if any error is encountered, it will just once reconnect and try again.
|
||||
func (gsw gosnmpWrapper) Walk(oid string, fn gosnmp.WalkFunc) error {
|
||||
var err error
|
||||
// On error, retry once.
|
||||
// Unfortunately we can't distinguish between an error returned by gosnmp, and one returned by the walk function.
|
||||
for i := 0; i < 2; i++ {
|
||||
if gsw.Version == gosnmp.Version1 {
|
||||
err = gsw.GoSNMP.Walk(oid, fn)
|
||||
if _, ok := fields[index]; ok {
|
||||
fields[index][name] = normalize(ent.Value)
|
||||
} else {
|
||||
err = gsw.GoSNMP.BulkWalk(oid, fn)
|
||||
fields[index] = map[string]interface{}{
|
||||
name: normalize(ent.Value),
|
||||
}
|
||||
}
|
||||
if err == nil {
|
||||
return nil
|
||||
}
|
||||
if err := gsw.GoSNMP.Connect(); err != nil {
|
||||
return Errorf(err, "reconnecting")
|
||||
}
|
||||
}
|
||||
return err
|
||||
return nil
|
||||
})
|
||||
}
|
||||
|
||||
// Get wraps GoSNMP.GET().
|
||||
// If any error is encountered, it will just once reconnect and try again.
|
||||
func (gsw gosnmpWrapper) Get(oids []string) (*gosnmp.SnmpPacket, error) {
|
||||
var err error
|
||||
var pkt *gosnmp.SnmpPacket
|
||||
for i := 0; i < 2; i++ {
|
||||
pkt, err = gsw.GoSNMP.Get(oids)
|
||||
if err == nil {
|
||||
return pkt, nil
|
||||
}
|
||||
if err := gsw.GoSNMP.Connect(); err != nil {
|
||||
return nil, Errorf(err, "reconnecting")
|
||||
// get simply gets the given OID and converts it to the given type.
|
||||
func get(gs snmpConnection, oid string) (interface{}, error) {
|
||||
pkt, err := gs.Get([]string{oid})
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("Error performing get: %s", err)
|
||||
}
|
||||
if pkt != nil && len(pkt.Variables) > 0 && pkt.Variables[0].Type != gosnmp.NoSuchObject {
|
||||
ent := pkt.Variables[0]
|
||||
return normalize(ent.Value), nil
|
||||
}
|
||||
return nil, nil
|
||||
}
|
||||
|
||||
func (s *Snmp) getMibName(oid string) (string, string) {
|
||||
name, ok := s.oidToMib[oid]
|
||||
if !ok {
|
||||
// lookup the mib using snmptranslate
|
||||
name = lookupOidName(s.translateBin, oid)
|
||||
s.oidToMib[oid] = name
|
||||
}
|
||||
return separateIndex(name)
|
||||
}
|
||||
|
||||
func (w *Walk) compileWalkFilters(acc telegraf.Accumulator) {
|
||||
// if it's the first gather, compile any inherit_tags filter:
|
||||
if len(w.InheritTags) > 0 && w.inheritTags == nil {
|
||||
var err error
|
||||
w.inheritTags, err = filter.CompileFilter(w.InheritTags)
|
||||
if err != nil {
|
||||
acc.AddError(err)
|
||||
}
|
||||
}
|
||||
// if it's the first gather, compile any include filter:
|
||||
if len(w.Include) > 0 && w.include == nil {
|
||||
var err error
|
||||
w.include, err = filter.CompileFilter(w.Include)
|
||||
if err != nil {
|
||||
acc.AddError(err)
|
||||
}
|
||||
}
|
||||
// if it's the first gather, compile any exclude filter:
|
||||
if len(w.Exclude) > 0 && w.exclude == nil {
|
||||
var err error
|
||||
w.exclude, err = filter.CompileFilter(w.Exclude)
|
||||
if err != nil {
|
||||
acc.AddError(err)
|
||||
}
|
||||
}
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// getConnection creates a snmpConnection (*gosnmp.GoSNMP) object and caches the
|
||||
|
|
@ -479,7 +337,7 @@ func (s *Snmp) getConnection(agent string) (snmpConnection, error) {
|
|||
host, portStr, err := net.SplitHostPort(agent)
|
||||
if err != nil {
|
||||
if err, ok := err.(*net.AddrError); !ok || err.Err != "missing port in address" {
|
||||
return nil, Errorf(err, "parsing host")
|
||||
return nil, fmt.Errorf("reconnecting %s", err)
|
||||
}
|
||||
host = agent
|
||||
portStr = "161"
|
||||
|
|
@ -488,13 +346,13 @@ func (s *Snmp) getConnection(agent string) (snmpConnection, error) {
|
|||
|
||||
port, err := strconv.ParseUint(portStr, 10, 16)
|
||||
if err != nil {
|
||||
return nil, Errorf(err, "parsing port")
|
||||
return nil, fmt.Errorf("reconnecting %s", err)
|
||||
}
|
||||
gs.Port = uint16(port)
|
||||
|
||||
if s.Timeout != "" {
|
||||
if gs.Timeout, err = time.ParseDuration(s.Timeout); err != nil {
|
||||
return nil, Errorf(err, "parsing timeout")
|
||||
return nil, fmt.Errorf("reconnecting %s", err)
|
||||
}
|
||||
} else {
|
||||
gs.Timeout = time.Second * 1
|
||||
|
|
@ -568,112 +426,77 @@ func (s *Snmp) getConnection(agent string) (snmpConnection, error) {
|
|||
}
|
||||
|
||||
sp.PrivacyPassphrase = s.PrivPassword
|
||||
|
||||
sp.AuthoritativeEngineID = s.EngineID
|
||||
|
||||
sp.AuthoritativeEngineBoots = s.EngineBoots
|
||||
|
||||
sp.AuthoritativeEngineTime = s.EngineTime
|
||||
}
|
||||
|
||||
if err := gs.Connect(); err != nil {
|
||||
return nil, Errorf(err, "setting up connection")
|
||||
return nil, fmt.Errorf("setting up connection %s", err)
|
||||
}
|
||||
|
||||
s.connectionCache[agent] = gs
|
||||
return gs, nil
|
||||
}
|
||||
|
||||
// fieldConvert converts from any type according to the conv specification
|
||||
// "float"/"float(0)" will convert the value into a float.
|
||||
// "float(X)" will convert the value into a float, and then move the decimal before Xth right-most digit.
|
||||
// "int" will convert the value into an integer.
|
||||
// "" will convert a byte slice into a string.
|
||||
// Any other conv will return the input value unchanged.
|
||||
func fieldConvert(conv string, v interface{}) interface{} {
|
||||
if conv == "" {
|
||||
if bs, ok := v.([]byte); ok {
|
||||
return string(bs)
|
||||
}
|
||||
return v
|
||||
}
|
||||
|
||||
var d int
|
||||
if _, err := fmt.Sscanf(conv, "float(%d)", &d); err == nil || conv == "float" {
|
||||
switch vt := v.(type) {
|
||||
case float32:
|
||||
v = float64(vt) / math.Pow10(d)
|
||||
case float64:
|
||||
v = float64(vt) / math.Pow10(d)
|
||||
case int:
|
||||
v = float64(vt) / math.Pow10(d)
|
||||
case int8:
|
||||
v = float64(vt) / math.Pow10(d)
|
||||
case int16:
|
||||
v = float64(vt) / math.Pow10(d)
|
||||
case int32:
|
||||
v = float64(vt) / math.Pow10(d)
|
||||
case int64:
|
||||
v = float64(vt) / math.Pow10(d)
|
||||
case uint:
|
||||
v = float64(vt) / math.Pow10(d)
|
||||
case uint8:
|
||||
v = float64(vt) / math.Pow10(d)
|
||||
case uint16:
|
||||
v = float64(vt) / math.Pow10(d)
|
||||
case uint32:
|
||||
v = float64(vt) / math.Pow10(d)
|
||||
case uint64:
|
||||
v = float64(vt) / math.Pow10(d)
|
||||
case []byte:
|
||||
vf, _ := strconv.ParseFloat(string(vt), 64)
|
||||
v = vf / math.Pow10(d)
|
||||
case string:
|
||||
vf, _ := strconv.ParseFloat(vt, 64)
|
||||
v = vf / math.Pow10(d)
|
||||
}
|
||||
}
|
||||
if conv == "int" {
|
||||
switch vt := v.(type) {
|
||||
case float32:
|
||||
v = int64(vt)
|
||||
case float64:
|
||||
v = int64(vt)
|
||||
case int:
|
||||
v = int64(vt)
|
||||
case int8:
|
||||
v = int64(vt)
|
||||
case int16:
|
||||
v = int64(vt)
|
||||
case int32:
|
||||
v = int64(vt)
|
||||
case int64:
|
||||
v = int64(vt)
|
||||
case uint:
|
||||
v = int64(vt)
|
||||
case uint8:
|
||||
v = int64(vt)
|
||||
case uint16:
|
||||
v = int64(vt)
|
||||
case uint32:
|
||||
v = int64(vt)
|
||||
case uint64:
|
||||
v = int64(vt)
|
||||
case []byte:
|
||||
v, _ = strconv.Atoi(string(vt))
|
||||
case string:
|
||||
v, _ = strconv.Atoi(vt)
|
||||
}
|
||||
// normalize normalizes the given interface for metric storage.
|
||||
func normalize(v interface{}) interface{} {
|
||||
switch vt := v.(type) {
|
||||
case []byte:
|
||||
v = string(vt)
|
||||
}
|
||||
|
||||
return v
|
||||
}
|
||||
|
||||
func copyTags(in map[string]string, inheritTags filter.Filter) map[string]string {
|
||||
out := map[string]string{}
|
||||
for k, v := range in {
|
||||
if inheritTags != nil {
|
||||
if !inheritTags.Match(k) {
|
||||
continue
|
||||
}
|
||||
}
|
||||
out[k] = v
|
||||
}
|
||||
return out
|
||||
}
|
||||
|
||||
// lookupOidName looks up the MIB name of the given OID using the provided
|
||||
// snmptranslate binary. If a name is not found, then we just return the OID.
|
||||
func lookupOidName(bin, oid string) string {
|
||||
name := oid
|
||||
if bin != "" {
|
||||
out, err := internal.CombinedOutputTimeout(
|
||||
exec.Command(bin, "-Os", oid),
|
||||
time.Millisecond*250)
|
||||
if err == nil && len(out) > 0 {
|
||||
name = strings.TrimSpace(string(out))
|
||||
}
|
||||
}
|
||||
return name
|
||||
}
|
||||
|
||||
// separateIndex takes an input string (either a MIB or an OID) and separates
|
||||
// out the index from it, ie:
|
||||
// ifName.1 -> (ifName, 1)
|
||||
// snmpInPkts.0 -> (snmpInPkts, 0)
|
||||
// .1.3.6.4.2.0 -> (.1.3.6.4.2, 0)
|
||||
func separateIndex(in string) (string, string) {
|
||||
items := strings.Split(in, ".")
|
||||
if len(items) == 1 {
|
||||
return in, "0"
|
||||
}
|
||||
index := items[len(items)-1]
|
||||
return strings.Join(items[0:len(items)-1], "."), index
|
||||
}
|
||||
|
||||
func init() {
|
||||
bin, _ := exec.LookPath("snmptranslate")
|
||||
inputs.Add("snmp", func() telegraf.Input {
|
||||
return &Snmp{
|
||||
Name: "snmp",
|
||||
Retries: 5,
|
||||
MaxRepetitions: 50,
|
||||
translateBin: bin,
|
||||
oidToMib: make(map[string]string),
|
||||
}
|
||||
})
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue