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'use strict';
// This program will connect to one or more SNMP Agents
// example configuration in /etc/netdata/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
},
"out": {
"oid": ".1.3.6.1.2.1.2.2.1.16.1",
"algorithm": "incremental",
"multiplier": -8,
"divisor": 1024
}
}
},
"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
},
"out": {
"oid": ".1.3.6.1.2.1.2.2.1.16.2",
"algorithm": "incremental",
"multiplier": -8,
"divisor": 1024
}
}
}
}
}
]
}
*/
// 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
},
"out": {
"oid": ".1.3.6.1.2.1.2.2.1.16.",
"algorithm": "incremental",
"multiplier": -8,
"divisor": 1024
}
}
}
}
}
]
}
*/
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) {
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(netdata.options.DEBUG === true)
netdata.debug(service.module.name + ': ' + service.name + ': preparing ' + this.name + ' OIDs');
// build an index of all OIDs
service.snmp_oids_index = {};
for(var c in service.request.charts) {
// for each chart
if(netdata.options.DEBUG === true)
netdata.debug(service.module.name + ': ' + service.name + ': indexing ' + this.name + ' chart: ' + c);
if(typeof service.request.charts[c].titleoid !== 'undefined') {
service.snmp_oids_index[this.fixoid(service.request.charts[c].titleoid)] = {
type: 'title',
link: service.request.charts[c]
};
}
for(var d in service.request.charts[c].dimensions) {
// for each dimension in the chart
var oid = this.fixoid(service.request.charts[c].dimensions[d].oid);
var oidname = this.fixoid(service.request.charts[c].dimensions[d].oidname);
if(netdata.options.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: service.request.charts[c].dimensions[d]
};
if(typeof oidname !== 'undefined')
service.snmp_oids_index[oidname] = {
type: 'name',
link: service.request.charts[c].dimensions[d]
};
// and set the value to null
service.request.charts[c].dimensions[d].value = null;
}
}
if(netdata.options.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 = new Array();
for(var o in service.snmp_oids_index)
service.snmp_oids.push(o);
if(netdata.options.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();
for(var o in service.snmp_oids_index)
if(service.snmp_oids_index[o].type === 'value')
service.snmp_oids.push(o);
}
},
getdata: function(service, index, ok, failed, callback) {
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(netdata.options.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(netdata.options.DEBUG === true)
netdata.debug(service.module.name + ': ' + service.name + ': got valid ' + service.module.name + ' response: ' + netdata.stringify(varbinds));
for(var i = 0; i < varbinds.length; i++) {
var value = null;
if(net_snmp.isVarbindError(varbinds[i])) {
if(netdata.options.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: ' + snmp.varbindError(varbinds[i]));
value = null;
failed++;
}
else {
if(netdata.options.DEBUG === true)
netdata.debug(service.module.name + ': ' + service.name + ': found ' + service.module.name + ' value of OIDs ' + varbinds[i].oid + " = " + varbinds[i].value);
value = varbinds[i].value;
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; break;
case 'value': service.snmp_oids_index[varbinds[i].oid].link.value = value; break;
}
}
}
if(netdata.options.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) {
this.prepare(service);
if(service.snmp_oids.length === 0) {
// no OIDs found for this service
if(netdata.options.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(netdata.options.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(netdata.options.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();
for(var c in service.request.charts) {
var chart = snmp.charts[c];
if(typeof chart === 'undefined') {
chart = service.chart(c, service.request.charts[c]);
snmp.charts[c] = chart;
}
service.begin(chart);
for( var d in service.request.charts[c].dimensions )
if(service.request.charts[c].dimensions[d].value !== null)
service.set(d, service.request.charts[c].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) {
if(netdata.options.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
for(var c in service.request.charts) {
if(netdata.options.DEBUG === true)
netdata.debug(this.name + ': snmp hostname: ' + conf.hostname + ', examining chart: ' + c);
if(typeof service.request.charts[c].update_every === 'undefined')
service.request.charts[c].update_every = service.update_every;
if(typeof service.request.charts[c].multiply_range !== 'undefined') {
var from = service.request.charts[c].multiply_range[0];
var to = service.request.charts[c].multiply_range[1];
var prio = service.request.charts[c].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.charts[c]);
chart.title += from.toString();
if(typeof chart.titleoid !== 'undefined')
chart.titleoid += from.toString();
chart.priority = prio++;
for(var d in chart.dimensions) {
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;
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