'use strict'; // SPDX-License-Identifier: GPL-3.0-or-later // netdata snmp module // This program will connect to one or more SNMP Agents // // example configuration in /etc/netdata/node.d/snmp.conf /* { "enable_autodetect": false, "update_every": 5, "max_request_size": 50, "servers": [ { "hostname": "10.11.12.8", "community": "public", "update_every": 10, "max_request_size": 50, "options": { "timeout": 10000 }, "charts": { "snmp_switch.bandwidth_port1": { "title": "Switch Bandwidth for port 1", "units": "kilobits/s", "type": "area", "priority": 1, "dimensions": { "in": { "oid": ".1.3.6.1.2.1.2.2.1.10.1", "algorithm": "incremental", "multiplier": 8, "divisor": 1024, "offset": 0 }, "out": { "oid": ".1.3.6.1.2.1.2.2.1.16.1", "algorithm": "incremental", "multiplier": -8, "divisor": 1024, "offset": 0 } } }, "snmp_switch.bandwidth_port2": { "title": "Switch Bandwidth for port 2", "units": "kilobits/s", "type": "area", "priority": 1, "dimensions": { "in": { "oid": ".1.3.6.1.2.1.2.2.1.10.2", "algorithm": "incremental", "multiplier": 8, "divisor": 1024, "offset": 0 }, "out": { "oid": ".1.3.6.1.2.1.2.2.1.16.2", "algorithm": "incremental", "multiplier": -8, "divisor": 1024, "offset": 0 } } } } } ] } */ // You can also give ranges of charts like the following. // This will append 1-24 to id, title, oid (on each dimension) // so that 24 charts will be created. /* { "enable_autodetect": false, "update_every": 10, "max_request_size": 50, "servers": [ { "hostname": "10.11.12.8", "community": "public", "update_every": 10, "max_request_size": 50, "options": { "timeout": 20000 }, "charts": { "snmp_switch.bandwidth_port": { "title": "Switch Bandwidth for port ", "units": "kilobits/s", "type": "area", "priority": 1, "multiply_range": [ 1, 24 ], "dimensions": { "in": { "oid": ".1.3.6.1.2.1.2.2.1.10.", "algorithm": "incremental", "multiplier": 8, "divisor": 1024, "offset": 0 }, "out": { "oid": ".1.3.6.1.2.1.2.2.1.16.", "algorithm": "incremental", "multiplier": -8, "divisor": 1024, "offset": 0 } } } } } ] } */ var net_snmp = require('net-snmp'); var extend = require('extend'); var netdata = require('netdata'); if(netdata.options.DEBUG === true) netdata.debug('loaded', __filename, ' plugin'); netdata.processors.snmp = { name: 'snmp', fixoid: function(oid) { if(typeof oid !== 'string') return oid; if(oid.charAt(0) === '.') return oid.substring(1, oid.length); return oid; }, prepare: function(service) { var __DEBUG = netdata.options.DEBUG; if(typeof service.snmp_oids === 'undefined' || service.snmp_oids === null || service.snmp_oids.length === 0) { // this is the first time we see this service if(__DEBUG === true) netdata.debug(service.module.name + ': ' + service.name + ': preparing ' + this.name + ' OIDs'); // build an index of all OIDs service.snmp_oids_index = {}; var chart_keys = Object.keys(service.request.charts); var chart_keys_len = chart_keys.length; while(chart_keys_len--) { var c = chart_keys[chart_keys_len]; var chart = service.request.charts[c]; // for each chart if(__DEBUG === true) netdata.debug(service.module.name + ': ' + service.name + ': indexing ' + this.name + ' chart: ' + c); if(typeof chart.titleoid !== 'undefined') { service.snmp_oids_index[this.fixoid(chart.titleoid)] = { type: 'title', link: chart }; } var dim_keys = Object.keys(chart.dimensions); var dim_keys_len = dim_keys.length; while(dim_keys_len--) { var d = dim_keys[dim_keys_len]; var dim = chart.dimensions[d]; // for each dimension in the chart var oid = this.fixoid(dim.oid); var oidname = this.fixoid(dim.oidname); if(__DEBUG === true) netdata.debug(service.module.name + ': ' + service.name + ': indexing ' + this.name + ' chart: ' + c + ', dimension: ' + d + ', OID: ' + oid + ", OID name: " + oidname); // link it to the point we need to set the value to service.snmp_oids_index[oid] = { type: 'value', link: dim }; if(typeof oidname !== 'undefined') service.snmp_oids_index[oidname] = { type: 'name', link: dim }; // and set the value to null dim.value = null; } } if(__DEBUG === true) netdata.debug(service.module.name + ': ' + service.name + ': indexed ' + this.name + ' OIDs: ' + netdata.stringify(service.snmp_oids_index)); // now create the array of OIDs needed by net-snmp service.snmp_oids = Object.keys(service.snmp_oids_index); if(__DEBUG === true) netdata.debug(service.module.name + ': ' + service.name + ': final list of ' + this.name + ' OIDs: ' + netdata.stringify(service.snmp_oids)); service.snmp_oids_cleaned = 0; } else if(service.snmp_oids_cleaned === 0) { service.snmp_oids_cleaned = 1; // the second time, keep only values service.snmp_oids = new Array(); var oid_keys = Object.keys(service.snmp_oids_index); var oid_keys_len = oid_keys.length; while(oid_keys_len--) { if (service.snmp_oids_index[oid_keys[oid_keys_len]].type === 'value') service.snmp_oids.push(oid_keys[oid_keys_len]); } } }, getdata: function(service, index, ok, failed, callback) { var __DEBUG = netdata.options.DEBUG; var that = this; if(index >= service.snmp_oids.length) { callback((ok > 0)?{ ok: ok, failed: failed }:null); return; } var slice; if(service.snmp_oids.length <= service.request.max_request_size) { slice = service.snmp_oids; index = service.snmp_oids.length; } else if(service.snmp_oids.length - index <= service.request.max_request_size) { slice = service.snmp_oids.slice(index, service.snmp_oids.length); index = service.snmp_oids.length; } else { slice = service.snmp_oids.slice(index, index + service.request.max_request_size); index += service.request.max_request_size; } if(__DEBUG === true) netdata.debug(service.module.name + ': ' + service.name + ': making ' + slice.length + ' entries request, max is: ' + service.request.max_request_size); service.snmp_session.get(slice, function(error, varbinds) { if(error) { service.error('Received error = ' + netdata.stringify(error) + ' varbinds = ' + netdata.stringify(varbinds)); // make all values null var len = slice.length; while(len--) service.snmp_oids_index[slice[len]].value = null; } else { if(__DEBUG === true) netdata.debug(service.module.name + ': ' + service.name + ': got valid ' + service.module.name + ' response: ' + netdata.stringify(varbinds)); var varbinds_len = varbinds.length; for(var i = 0; i < varbinds_len ; i++) { var value = null; if(net_snmp.isVarbindError(varbinds[i])) { if(__DEBUG === true) netdata.debug(service.module.name + ': ' + service.name + ': failed ' + service.module.name + ' get for OIDs ' + varbinds[i].oid); service.error('OID ' + varbinds[i].oid + ' gave error: ' + net_snmp.varbindError(varbinds[i])); value = null; failed++; } else { // test fom Counter64 // varbinds[i].type = net_snmp.ObjectType.Counter64; // varbinds[i].value = new Buffer([0x34, 0x49, 0x2e, 0xdc, 0xd1]); switch(varbinds[i].type) { case net_snmp.ObjectType.OctetString: if (service.snmp_oids_index[varbinds[i].oid].type !== 'title' && service.snmp_oids_index[varbinds[i].oid].type !== 'name') { // parse floating point values, exposed as strings value = parseFloat(varbinds[i].value) * 1000; if (__DEBUG === true) netdata.debug(service.module.name + ': ' + service.name + ': found ' + service.module.name + ' value of OIDs ' + varbinds[i].oid + ", ObjectType " + net_snmp.ObjectType[varbinds[i].type] + " (" + netdata.stringify(varbinds[i].type) + "), typeof(" + typeof(varbinds[i].value) + "), in JSON: " + netdata.stringify(varbinds[i].value) + ", value = " + value.toString() + " (parsed as float in string)"); } else { // just use the string value = varbinds[i].value; if (__DEBUG === true) netdata.debug(service.module.name + ': ' + service.name + ': found ' + service.module.name + ' value of OIDs ' + varbinds[i].oid + ", ObjectType " + net_snmp.ObjectType[varbinds[i].type] + " (" + netdata.stringify(varbinds[i].type) + "), typeof(" + typeof(varbinds[i].value) + "), in JSON: " + netdata.stringify(varbinds[i].value) + ", value = " + value.toString() + " (parsed as string)"); } break; case net_snmp.ObjectType.Counter64: // copy the buffer value = '0x' + varbinds[i].value.toString('hex'); if(__DEBUG === true) netdata.debug(service.module.name + ': ' + service.name + ': found ' + service.module.name + ' value of OIDs ' + varbinds[i].oid + ", ObjectType " + net_snmp.ObjectType[varbinds[i].type] + " (" + netdata.stringify(varbinds[i].type) + "), typeof(" + typeof(varbinds[i].value) + "), in JSON: " + netdata.stringify(varbinds[i].value) + ", value = " + value.toString() + " (parsed as buffer)"); break; case net_snmp.ObjectType.Integer: case net_snmp.ObjectType.Counter: case net_snmp.ObjectType.Gauge: default: value = varbinds[i].value; if(__DEBUG === true) netdata.debug(service.module.name + ': ' + service.name + ': found ' + service.module.name + ' value of OIDs ' + varbinds[i].oid + ", ObjectType " + net_snmp.ObjectType[varbinds[i].type] + " (" + netdata.stringify(varbinds[i].type) + "), typeof(" + typeof(varbinds[i].value) + "), in JSON: " + netdata.stringify(varbinds[i].value) + ", value = " + value.toString() + " (parsed as number)"); break; } ok++; } if(value !== null) { switch(service.snmp_oids_index[varbinds[i].oid].type) { case 'title': service.snmp_oids_index[varbinds[i].oid].link.title += ' ' + value; break; case 'name' : service.snmp_oids_index[varbinds[i].oid].link.name = value.toString().replace(/\W/g, '_'); break; case 'value': service.snmp_oids_index[varbinds[i].oid].link.value = value; break; } } } if(__DEBUG === true) netdata.debug(service.module.name + ': ' + service.name + ': finished ' + service.module.name + ' with ' + ok + ' successful and ' + failed + ' failed values'); } that.getdata(service, index, ok, failed, callback); }); }, process: function(service, callback) { var __DEBUG = netdata.options.DEBUG; this.prepare(service); if(service.snmp_oids.length === 0) { // no OIDs found for this service if(__DEBUG === true) service.error('no OIDs to process.'); callback(null); return; } if(typeof service.snmp_session === 'undefined' || service.snmp_session === null) { // no SNMP session has been created for this service // the SNMP session is just the initialization of NET-SNMP if(__DEBUG === true) netdata.debug(service.module.name + ': ' + service.name + ': opening ' + this.name + ' session on ' + service.request.hostname + ' community ' + service.request.community + ' options ' + netdata.stringify(service.request.options)); // create the SNMP session service.snmp_session = net_snmp.createSession (service.request.hostname, service.request.community, service.request.options); if(__DEBUG === true) netdata.debug(service.module.name + ': ' + service.name + ': got ' + this.name + ' session: ' + netdata.stringify(service.snmp_session)); // if we later need traps, this is how to do it: //service.snmp_session.trap(net_snmp.TrapType.LinkDown, function(error) { // if(error) console.error('trap error: ' + netdata.stringify(error)); //}); } // do it, get the SNMP values for the sessions we need this.getdata(service, 0, 0, 0, callback); } }; var snmp = { name: __filename, enable_autodetect: true, update_every: 1, base_priority: 50000, charts: {}, processResponse: function(service, data) { if(data !== null) { if(service.added !== true) service.commit(); var chart_keys = Object.keys(service.request.charts); var chart_keys_len = chart_keys.length; for(var i = 0; i < chart_keys_len; i++) { var c = chart_keys[i]; var chart = snmp.charts[c]; if(typeof chart === 'undefined') { chart = service.chart(c, service.request.charts[c]); snmp.charts[c] = chart; } service.begin(chart); var dimensions = service.request.charts[c].dimensions; var dim_keys = Object.keys(dimensions); var dim_keys_len = dim_keys.length; for(var j = 0; j < dim_keys_len ; j++) { var d = dim_keys[j]; if (dimensions[d].value !== null) { if(typeof dimensions[d].offset === 'number' && typeof dimensions[d].value === 'number') service.set(d, dimensions[d].value + dimensions[d].offset); else service.set(d, dimensions[d].value); } } service.end(); } } }, // module.serviceExecute() // this function is called only from this module // its purpose is to prepare the request and call // netdata.serviceExecute() serviceExecute: function(conf) { var __DEBUG = netdata.options.DEBUG; if(__DEBUG === true) netdata.debug(this.name + ': snmp hostname: ' + conf.hostname + ', update_every: ' + conf.update_every); var service = netdata.service({ name: conf.hostname, request: conf, update_every: conf.update_every, module: this, processor: netdata.processors.snmp }); // multiply the charts, if required var chart_keys = Object.keys(service.request.charts); var chart_keys_len = chart_keys.length; for( var i = 0; i < chart_keys_len ; i++ ) { var c = chart_keys[i]; var service_request_chart = service.request.charts[c]; if(__DEBUG === true) netdata.debug(this.name + ': snmp hostname: ' + conf.hostname + ', examining chart: ' + c); if(typeof service_request_chart.update_every === 'undefined') service_request_chart.update_every = service.update_every; if(typeof service_request_chart.multiply_range !== 'undefined') { var from = service_request_chart.multiply_range[0]; var to = service_request_chart.multiply_range[1]; var prio = service_request_chart.priority || 1; if(prio < snmp.base_priority) prio += snmp.base_priority; while(from <= to) { var id = c + from.toString(); var chart = extend(true, {}, service_request_chart); chart.title += from.toString(); if(typeof chart.titleoid !== 'undefined') chart.titleoid += from.toString(); chart.priority = prio++; var dim_keys = Object.keys(chart.dimensions); var dim_keys_len = dim_keys.length; for(var j = 0; j < dim_keys_len ; j++) { var d = dim_keys[j]; chart.dimensions[d].oid += from.toString(); if(typeof chart.dimensions[d].oidname !== 'undefined') chart.dimensions[d].oidname += from.toString(); } service.request.charts[id] = chart; from++; } delete service.request.charts[c]; } else { if(service.request.charts[c].priority < snmp.base_priority) service.request.charts[c].priority += snmp.base_priority; } } service.execute(this.processResponse); }, configure: function(config) { var added = 0; if(typeof config.max_request_size === 'undefined') config.max_request_size = 50; if(typeof(config.servers) !== 'undefined') { var len = config.servers.length; while(len--) { if(typeof config.servers[len].update_every === 'undefined') config.servers[len].update_every = this.update_every; if(typeof config.servers[len].max_request_size === 'undefined') config.servers[len].max_request_size = config.max_request_size; this.serviceExecute(config.servers[len]); added++; } } return added; }, // module.update() // this is called repeatidly to collect data, by calling // service.execute() update: function(service, callback) { service.execute(function(serv, data) { service.module.processResponse(serv, data); callback(); }); } }; module.exports = snmp;