Frank Elsinga
4 months ago
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GitHub
commit
1822b55846
@ -0,0 +1,16 @@
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exports.up = function (knex) {
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return knex.schema
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.alterTable("monitor", function (table) {
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table.string("snmp_oid").defaultTo(null);
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table.enum("snmp_version", [ "1", "2c", "3" ]).defaultTo("2c");
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table.string("json_path_operator").defaultTo(null);
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});
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};
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exports.down = function (knex) {
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return knex.schema.alterTable("monitor", function (table) {
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table.dropColumn("snmp_oid");
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table.dropColumn("snmp_version");
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table.dropColumn("json_path_operator");
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});
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};
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@ -0,0 +1,63 @@
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const { MonitorType } = require("./monitor-type");
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const { UP, log, evaluateJsonQuery } = require("../../src/util");
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const snmp = require("net-snmp");
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class SNMPMonitorType extends MonitorType {
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name = "snmp";
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/**
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* @inheritdoc
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*/
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async check(monitor, heartbeat, _server) {
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let session;
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try {
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const sessionOptions = {
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port: monitor.port || "161",
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retries: monitor.maxretries,
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timeout: monitor.timeout * 1000,
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version: snmp.Version[monitor.snmpVersion],
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};
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session = snmp.createSession(monitor.hostname, monitor.radiusPassword, sessionOptions);
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// Handle errors during session creation
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session.on("error", (error) => {
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throw new Error(`Error creating SNMP session: ${error.message}`);
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});
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const varbinds = await new Promise((resolve, reject) => {
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session.get([ monitor.snmpOid ], (error, varbinds) => {
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error ? reject(error) : resolve(varbinds);
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});
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});
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log.debug("monitor", `SNMP: Received varbinds (Type: ${snmp.ObjectType[varbinds[0].type]} Value: ${varbinds[0].value})`);
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if (varbinds.length === 0) {
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throw new Error(`No varbinds returned from SNMP session (OID: ${monitor.snmpOid})`);
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}
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if (varbinds[0].type === snmp.ObjectType.NoSuchInstance) {
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throw new Error(`The SNMP query returned that no instance exists for OID ${monitor.snmpOid}`);
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}
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// We restrict querying to one OID per monitor, therefore `varbinds[0]` will always contain the value we're interested in.
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const value = varbinds[0].value;
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const { status, response } = await evaluateJsonQuery(value, monitor.jsonPath, monitor.jsonPathOperator, monitor.expectedValue);
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if (status) {
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heartbeat.status = UP;
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heartbeat.msg = `JSON query passes (comparing ${response} ${monitor.jsonPathOperator} ${monitor.expectedValue})`;
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} else {
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throw new Error(`JSON query does not pass (comparing ${response} ${monitor.jsonPathOperator} ${monitor.expectedValue})`);
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}
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} finally {
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if (session) {
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session.close();
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}
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}
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}
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}
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module.exports = {
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SNMPMonitorType,
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};
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