Add SNMP test tool

receivers/README.md

@@ -24,6 +24,7 @@ This allows to specify
 - [`http`](./httpReceiver.md): Listen for HTTP Post requests transporting metrics in InfluxDB line protocol
 - [`ipmi`](./ipmiReceiver.md): Read IPMI sensor readings
 - [`redfish`](redfishReceiver.md) Use the Redfish (specification) to query thermal and power metrics
+- [`snmp`](./snmpReceiver.md) Query SNMP endpoints in the network
 
 ## Contributing own receivers
 

receivers/snmpReceiver.md

@@ -54,3 +54,7 @@ Each network-attached device that should be queried. A target consits of
 - `unit` can be empty, an OID or a user-given string
 
 If a OID is used for `name` or `unit`, the receiver will use the returned values to create the output metric. If there are any issues with the returned values, it uses the `OID`.
+
+## Testing
+
+For testing an SNMP endpoint and OIDs, you can use [`scripts/snmpReceiverTest`](../scripts/snmpReceiverTest)

scripts/snmpReceiverTest/README.md

@@ -0,0 +1,37 @@
+# snmpReceiverTest
+
+This script is a basic implementation of how the SNMPReceiver to test the connection before configuring
+the collector to get the data periodically.
+
+It does not support the specification of the `type`, `type-id`, `stype` and `stype-id` but since they are
+not required to test the functionality, they are left out.
+
+## Usage
+
+```sh
+$ go run snmpReceiverTest -h
+Usage of snmpReceiverTest:
+  -community string
+    	SNMP community (default "public")
+  -hostname string
+    	Hostname (default "127.0.0.1")
+  -name string
+    	Name of metric or OID
+  -port string
+    	Port number (default "161")
+  -timeout string
+    	Timeout for SNMP request (default "1s")
+  -unit string
+    	Unit of metric or OID
+  -value string
+    	Value OID
+  -version string
+    	SNMP version (default "2c")
+```
+
+## Example
+
+```sh
+$ go run scripts/snmpReceiverTest/snmpReceiverTest.go -name serialNumber -value .1.3.6.1.4.1.6574.1.5.2.0 -hostname $IP -community $COMMUNITY
+Name: serialNumber, Tags: map[type:node], Meta: map[], fields: map[value:18B0PCNXXXXX], Timestamp: 1702050709599311288
+```

scripts/snmpReceiverTest/snmpReceiverTest.go

@@ -0,0 +1,167 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"regexp"
+	"strconv"
+	"strings"
+	"time"
+
+	lp "github.com/ClusterCockpit/cc-metric-collector/pkg/ccMetric"
+	"github.com/gosnmp/gosnmp"
+)
+
+func ReadCLI() map[string]string {
+	args := map[string]string{
+		"port":      "161",
+		"community": "public",
+		"version":   "2c",
+		"hostname":  "127.0.0.1",
+		"timeout":   "1s",
+	}
+
+	host_cfg := flag.String("hostname", "127.0.0.1", "Hostname")
+	port_cfg := flag.String("port", "161", "Port number")
+	comm_cfg := flag.String("community", "public", "SNMP community")
+	vers_cfg := flag.String("version", "2c", "SNMP version")
+	time_cfg := flag.String("timeout", "1s", "Timeout for SNMP request")
+
+	name_cfg := flag.String("name", "", "Name of metric or OID")
+	value_cfg := flag.String("value", "", "Value OID")
+	unit_cfg := flag.String("unit", "", "Unit of metric or OID")
+
+	flag.Parse()
+
+	args["port"] = *port_cfg
+	args["community"] = *comm_cfg
+	args["hostname"] = *host_cfg
+	args["version"] = *vers_cfg
+	args["timeout"] = *time_cfg
+
+	args["name"] = *name_cfg
+	args["value"] = *value_cfg
+	args["unit"] = *unit_cfg
+
+	if len(args["name"]) == 0 || len(args["value"]) == 0 {
+		fmt.Printf("Required arguments: --name and --value\n")
+		flag.Usage()
+	}
+
+	return args
+}
+
+func validOid(oid string) bool {
+	// Regex from https://github.com/BornToBeRoot/NETworkManager/blob/6805740762bf19b95051c7eaa73cf2b4727733c3/Source/NETworkManager.Utilities/RegexHelper.cs#L88
+	// Match on leading dot added by Thomas Gruber <thomas.gruber@fau.de>
+	match, err := regexp.MatchString(`^[\.]?[012]\.(?:[0-9]|[1-3][0-9])(\.\d+)*$`, oid)
+	if err != nil {
+		return false
+	}
+	return match
+}
+
+func main() {
+
+	args := ReadCLI()
+
+	if len(args["name"]) == 0 || len(args["value"]) == 0 {
+		return
+	}
+
+	version := gosnmp.Version2c
+	if len(args["version"]) > 0 {
+		switch args["version"] {
+		case "1":
+			version = gosnmp.Version1
+		case "2c":
+			version = gosnmp.Version2c
+		case "3":
+			version = gosnmp.Version3
+		default:
+			fmt.Printf("Invalid SNMP version '%s'\n", args["version"])
+			return
+		}
+	}
+	v, err := strconv.ParseInt(args["port"], 10, 16)
+	if err != nil {
+		fmt.Printf("Failed to parse port number '%s'\n", args["port"])
+		return
+	}
+	port := uint16(v)
+
+	t, err := time.ParseDuration(args["timeout"])
+	if err != nil {
+		fmt.Printf("Failed to parse timeout '%s'\n", args["timeout"])
+		return
+	}
+	timeout := t
+
+	params := &gosnmp.GoSNMP{
+		Target:    args["hostname"],
+		Port:      port,
+		Community: args["community"],
+		Version:   version,
+		Timeout:   timeout,
+	}
+	err = params.Connect()
+	if err != nil {
+		fmt.Printf("Failed to connect to %s:%d : %v\n", params.Target, params.Port, err.Error())
+		return
+	}
+
+	oids := make([]string, 0)
+	idx := 0
+	name := gosnmp.SnmpPDU{
+		Value: args["name"],
+		Name:  args["name"],
+	}
+	nameidx := -1
+	value := gosnmp.SnmpPDU{
+		Value: nil,
+		Name:  args["value"],
+	}
+	valueidx := -1
+	unit := gosnmp.SnmpPDU{
+		Value: args["unit"],
+		Name:  args["unit"],
+	}
+	unitidx := -1
+	if validOid(args["name"]) {
+		oids = append(oids, args["name"])
+		nameidx = idx
+		idx++
+	}
+	if validOid(args["value"]) {
+		oids = append(oids, args["value"])
+		valueidx = idx
+		idx++
+	}
+	if len(args["unit"]) > 0 && validOid(args["unit"]) {
+		oids = append(oids, args["unit"])
+		unitidx = idx
+	}
+	result, err := params.Get(oids)
+	if err != nil {
+		fmt.Printf("Failed to get data for OIDs [%s] : %v\n", strings.Join(oids, ", "), err.Error())
+		return
+	}
+	if nameidx >= 0 && len(result.Variables) > nameidx {
+		name = result.Variables[nameidx]
+	}
+	if valueidx >= 0 && len(result.Variables) > valueidx {
+		value = result.Variables[valueidx]
+	}
+	if unitidx >= 0 && len(result.Variables) > unitidx {
+		unit = result.Variables[unitidx]
+	}
+	if value.Value != nil {
+		y, err := lp.New(name.Value.(string), map[string]string{"type": "node"}, map[string]string{}, map[string]interface{}{"value": value.Value}, time.Now())
+		if err == nil {
+			if len(unit.Name) > 0 && unit.Value != nil {
+				y.AddMeta("unit", unit.Value.(string))
+			}
+			fmt.Println(y)
+		}
+	}
+}