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snmp.js
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module.exports = function (RED) {
"use strict";
var snmp = require("net-snmp");
var sessions = {};
function getSession(host, community, version, timeout) {
var sessionKey = host + ":" + community + ":" + version;
var port = 161;
if (host.indexOf(":") !== -1) {
port = host.split(":")[1];
host = host.split(":")[0];
}
if (!(sessionKey in sessions)) {
sessions[sessionKey] = snmp.createSession(host, community, { port:port, version:version, timeout:(timeout || 5000) });
}
return sessions[sessionKey];
}
function SnmpNode(n) {
RED.nodes.createNode(this, n);
this.community = n.community;
this.host = n.host;
this.version = (n.version === "2c") ? snmp.Version2c : snmp.Version1;
this.oids = n.oids.replace(/\s/g, "");
this.timeout = Number(n.timeout || 5) * 1000;
var node = this;
this.on("input", function (msg) {
var host = node.host || msg.host;
var community = node.community || msg.community;
var oids = node.oids || msg.oid;
if (oids) {
getSession(host, community, node.version, node.timeout).get(oids.split(","), function (error, varbinds) {
if (error) {
node.error(error.toString(), msg);
}
else {
for (var i = 0; i < varbinds.length; i++) {
if (snmp.isVarbindError(varbinds[i])) {
node.error(snmp.varbindError(varbinds[i]), msg);
}
else {
if (varbinds[i].type == 4) { varbinds[i].value = varbinds[i].value.toString(); }
varbinds[i].tstr = snmp.ObjectType[varbinds[i].type];
//node.log(varbinds[i].oid + "|" + varbinds[i].tstr + "|" + varbinds[i].value);
}
}
msg.oid = oids;
msg.payload = varbinds;
node.send(msg);
}
});
}
else {
node.warn("No oid(s) to search for");
}
});
}
RED.nodes.registerType("snmp", SnmpNode);
function SnmpSNode(n) {
RED.nodes.createNode(this, n);
this.community = n.community;
this.host = n.host;
this.version = (n.version === "2c") ? snmp.Version2c : snmp.Version1;
this.varbinds = n.varbinds;
this.timeout = Number(n.timeout || 5) * 1000;
if (this.varbinds && this.varbinds.trim().length === 0) { delete this.varbinds; }
var node = this;
this.on("input", function (msg) {
var host = node.host || msg.host;
var community = node.community || msg.community;
var varbinds = (node.varbinds) ? JSON.parse(node.varbinds) : msg.varbinds;
if (varbinds) {
for (var i = 0; i < varbinds.length; i++) {
varbinds[i].type = snmp.ObjectType[varbinds[i].type];
}
getSession(host, community, node.version, node.timeout).set(varbinds, function (error, varbinds) {
if (error) {
node.error(error.toString(), msg);
}
else {
for (var i = 0; i < varbinds.length; i++) {
// for version 2c we must check each OID for an error condition
if (snmp.isVarbindError(varbinds[i])) {
node.error(snmp.varbindError(varbinds[i]), msg);
}
}
}
});
}
else {
node.warn("No varbinds to set");
}
});
}
RED.nodes.registerType("snmp set", SnmpSNode);
function SnmpTNode(n) {
RED.nodes.createNode(this, n);
this.community = n.community;
this.host = n.host;
this.version = (n.version === "2c") ? snmp.Version2c : snmp.Version1;
this.oids = n.oids.replace(/\s/g, "");
this.timeout = Number(n.timeout || 5) * 1000;
var node = this;
var maxRepetitions = 20;
function sortInt(a, b) {
if (a > b) { return 1; }
else if (b > a) { return -1; }
else { return 0; }
}
this.on("input", function (msg) {
var host = node.host || msg.host;
var community = node.community || msg.community;
var oids = node.oids || msg.oid;
if (oids) {
msg.oid = oids;
getSession(host, community, node.version, node.timeout).table(oids, maxRepetitions, function (error, table) {
if (error) {
node.error(error.toString(), msg);
}
else {
var indexes = [];
for (var index in table) {
if (table.hasOwnProperty(index)) {
indexes.push(parseInt(index));
}
}
indexes.sort(sortInt);
for (var i = 0; i < indexes.length; i++) {
var columns = [];
for (var column in table[indexes[i]]) {
if (table[indexes[i]].hasOwnProperty(column)) {
columns.push(parseInt(column));
}
}
columns.sort(sortInt);
// console.log("row index = " + indexes[i]);
// for (var j = 0; j < columns.length; j++) {
// console.log(" column " + columns[j] + " = " + table[indexes[i]][columns[j]]);
// }
}
msg.payload = table;
node.send(msg);
}
});
}
else {
node.warn("No oid to search for");
}
});
}
RED.nodes.registerType("snmp table", SnmpTNode);
function SnmpSubtreeNode(n) {
RED.nodes.createNode(this, n);
this.community = n.community;
this.host = n.host;
this.version = (n.version === "2c") ? snmp.Version2c : snmp.Version1;
this.oids = n.oids.replace(/\s/g, "");
this.timeout = Number(n.timeout || 5) * 1000;
var node = this;
var maxRepetitions = 20;
var response = [];
function feedCb(varbinds) {
for (var i = 0; i < varbinds.length; i++) {
if (snmp.isVarbindError(varbinds[i])) {
node.error(snmp.varbindError(varbinds[i]), msg);
}
else {
//console.log(varbinds[i].oid + "|" + varbinds[i].value);
response.push({ oid: varbinds[i].oid, value: varbinds[i].value });
}
}
}
this.on("input", function (msg) {
var host = node.host || msg.host;
var community = node.community || msg.community;
var oids = node.oids || msg.oid;
if (oids) {
msg.oid = oids;
getSession(host, community, node.version, node.timeout).subtree(msg.oid, maxRepetitions, feedCb, function (error) {
if (error) {
node.error(error.toString(), msg);
}
else {
// Clone the array
msg.payload = response.slice(0);
node.send(msg);
//Clears response
response.length = 0;
}
});
}
else {
node.warn("No oid to search for");
}
});
}
RED.nodes.registerType("snmp subtree", SnmpSubtreeNode);
function SnmpWalkerNode(n) {
RED.nodes.createNode(this, n);
this.community = n.community;
this.host = n.host;
this.version = (n.version === "2c") ? snmp.Version2c : snmp.Version1;
this.oids = n.oids.replace(/\s/g, "");
this.timeout = Number(n.timeout || 5) * 1000;
var node = this;
var maxRepetitions = 20;
var response = [];
function feedCb(varbinds) {
for (var i = 0; i < varbinds.length; i++) {
if (snmp.isVarbindError(varbinds[i])) {
node.error(snmp.varbindError(varbinds[i]), msg);
}
else {
//console.log(varbinds[i].oid + "|" + varbinds[i].value);
response.push({ oid: varbinds[i].oid, value: varbinds[i].value });
}
}
}
this.on("input", function (msg) {
node.msg = msg;
var oids = node.oids || msg.oid;
var host = node.host || msg.host;
var community = node.community || msg.community;
if (oids) {
msg.oid = oids;
getSession(host, community, node.version, node.timeout).walk(msg.oid, maxRepetitions, feedCb, function (error) {
if (error) {
node.error(error.toString(), msg);
}
else {
// Clone the array
msg.payload = response.slice(0);
node.send(msg);
//Clears response
response.length = 0;
}
});
}
else {
node.warn("No oid to search for");
}
});
}
RED.nodes.registerType("snmp walker", SnmpWalkerNode);
};