feat: Add SNMP Monitor

db/knex_migrations/2024-04-26-0000-snmp-monitor.js

@@ -0,0 +1,16 @@
+exports.up = function (knex) {
+    return knex.schema
+        .alterTable("monitor", function (table) {
+            table.string("snmp_oid").defaultTo(null);
+            table.enum("snmp_version", [ "1", "2c", "3" ]).defaultTo("2c");
+            table.string("json_path_operator").defaultTo(null);
+        });
+};
+
+exports.down = function (knex) {
+    return knex.schema.alterTable("monitor", function (table) {
+        table.dropColumn("snmp_oid");
+        table.dropColumn("snmp_version");
+        table.dropColumn("json_path_operator");
+    });
+};

package.json

@@ -119,6 +119,7 @@
         "mssql": "~11.0.0",
         "mysql2": "~3.9.6",
         "nanoid": "~3.3.4",
+        "net-snmp": "^3.11.2",
         "node-cloudflared-tunnel": "~1.0.9",
         "node-radius-client": "~1.0.0",
         "nodemailer": "~6.9.13",

server/model/monitor.js

@@ -2,7 +2,7 @@ const dayjs = require("dayjs");
 const axios = require("axios");
 const { Prometheus } = require("../prometheus");
 const { log, UP, DOWN, PENDING, MAINTENANCE, flipStatus, MAX_INTERVAL_SECOND, MIN_INTERVAL_SECOND,
-    SQL_DATETIME_FORMAT
+    SQL_DATETIME_FORMAT, evaluateJsonQuery
 } = require("../../src/util");
 const { tcping, ping, checkCertificate, checkStatusCode, getTotalClientInRoom, setting, mssqlQuery, postgresQuery, mysqlQuery, setSetting, httpNtlm, radius, grpcQuery,
     redisPingAsync, kafkaProducerAsync, getOidcTokenClientCredentials, rootCertificatesFingerprints, axiosAbortSignal
@@ -17,7 +17,6 @@ const apicache = require("../modules/apicache");
 const { UptimeKumaServer } = require("../uptime-kuma-server");
 const { DockerHost } = require("../docker");
 const Gamedig = require("gamedig");
-const jsonata = require("jsonata");
 const jwt = require("jsonwebtoken");
 const crypto = require("crypto");
 const { UptimeCalculator } = require("../uptime-calculator");
@@ -161,6 +160,9 @@ class Monitor extends BeanModel {
             kafkaProducerMessage: this.kafkaProducerMessage,
             screenshot,
             remote_browser: this.remote_browser,
+            snmpOid: this.snmpOid,
+            jsonPathOperator: this.jsonPathOperator,
+            snmpVersion: this.snmpVersion,
         };
 
         if (includeSensitiveData) {
@@ -598,25 +600,15 @@ class Monitor extends BeanModel {
                     } else if (this.type === "json-query") {
                         let data = res.data;
 
-                        // convert data to object
-                        if (typeof data === "string" && res.headers["content-type"] !== "application/json") {
-                            try {
-                                data = JSON.parse(data);
-                            } catch (_) {
-                                // Failed to parse as JSON, just process it as a string
-                            }
-                        }
+                        const { status, response } = await evaluateJsonQuery(data, this.jsonPath, this.jsonPathOperator, this.expectedValue);
 
-                        let expression = jsonata(this.jsonPath);
-
-                        let result = await expression.evaluate(data);
-
-                        if (result.toString() === this.expectedValue) {
-                            bean.msg += ", expected value is found";
+                        if (status) {
                             bean.status = UP;
+                            bean.msg = `JSON query passes (comparing ${response} ${this.jsonPathOperator} ${this.expectedValue})`;
                         } else {
-                            throw new Error(bean.msg + ", but value is not equal to expected value, value was: [" + result + "]");
+                            throw new Error(`JSON query does not pass (comparing ${response} ${this.jsonPathOperator} ${this.expectedValue})`);
                         }
+
                     }
 
                 } else if (this.type === "port") {

server/monitor-types/snmp.js

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

server/server.js

@@ -831,6 +831,10 @@ let needSetup = false;
                     monitor.kafkaProducerAllowAutoTopicCreation;
                 bean.gamedigGivenPortOnly = monitor.gamedigGivenPortOnly;
                 bean.remote_browser = monitor.remote_browser;
+                bean.snmpVersion = monitor.snmpVersion;
+                bean.snmpOid = monitor.snmpOid;
+                bean.jsonPathOperator = monitor.jsonPathOperator;
+                bean.timeout = monitor.timeout;
 
                 bean.validate();
 

server/uptime-kuma-server.js

@@ -113,6 +113,7 @@ class UptimeKumaServer {
         UptimeKumaServer.monitorTypeList["tailscale-ping"] = new TailscalePing();
         UptimeKumaServer.monitorTypeList["dns"] = new DnsMonitorType();
         UptimeKumaServer.monitorTypeList["mqtt"] = new MqttMonitorType();
+        UptimeKumaServer.monitorTypeList["snmp"] = new SNMPMonitorType();
         UptimeKumaServer.monitorTypeList["mongodb"] = new MongodbMonitorType();
 
         // Allow all CORS origins (polling) in development
@@ -517,4 +518,5 @@ const { RealBrowserMonitorType } = require("./monitor-types/real-browser-monitor
 const { TailscalePing } = require("./monitor-types/tailscale-ping");
 const { DnsMonitorType } = require("./monitor-types/dns");
 const { MqttMonitorType } = require("./monitor-types/mqtt");
+const { SNMPMonitorType } = require("./monitor-types/snmp");
 const { MongodbMonitorType } = require("./monitor-types/mongodb");

src/lang/bg-BG.json

@@ -802,7 +802,6 @@
     "twilioApiKey": "API ключ (по избор)",
     "Expected Value": "Очаквана стойност",
     "Json Query": "Заявка тип JSON",
-    "jsonQueryDescription": "Прави JSON заявка срещу отговора и проверява за очаквана стойност (Върнатата стойност ще бъде преобразувана в низ за сравнение). Разгледайте {0} за документация относно езика на заявката. Имате възможност да тествате {1}.",
     "Badge Duration (in hours)": "Времетраене на баджа (в часове)",
     "Badge Preview": "Преглед на баджа",
     "Notify Channel": "Канал за известяване",

src/lang/cs-CZ.json

@@ -823,7 +823,6 @@
     "Enable Kafka Producer Auto Topic Creation": "Povolit Kafka zprostředkovateli automatické vytváření vláken",
     "Kafka Producer Message": "Zpráva Kafka zprostředkovatele",
     "tailscalePingWarning": "Abyste mohli používat Tailscale Ping monitor, je nutné Uptime Kuma nainstalovat mimo Docker, a dále na váš server nainstalovat Tailscale klienta.",
-    "jsonQueryDescription": "Proveďte JSON dotaz vůči odpovědi a zkontrolujte očekávaný výstup (za účelem porovnání bude návratová hodnota převedena na řetězec). Dokumentaci k dotazovacímu jazyku naleznete na {0}, a využít můžete též {1}.",
     "Select": "Vybrat",
     "selectedMonitorCount": "Vybráno: {0}",
     "Check/Uncheck": "Vybrat/Zrušit výběr",

src/lang/de-CH.json

@@ -812,7 +812,6 @@
     "Json Query": "Json-Abfrage",
     "filterActive": "Aktiv",
     "filterActivePaused": "Pausiert",
-    "jsonQueryDescription": "Führe eine JSON-Abfrage gegen die Antwort durch und prüfe den erwarteten Wert (der Rückgabewert wird zum Vergleich in eine Zeichenkette umgewandelt). Auf {0} findest du die Dokumentation zur Abfragesprache. {1} kannst du Abfragen üben.",
     "Badge Duration (in hours)": "Abzeichen Dauer (in Stunden)",
     "Badge Preview": "Abzeichen Vorschau",
     "tailscalePingWarning": "Um den Tailscale Ping Monitor nutzen zu können, musst du Uptime Kuma ohne Docker installieren und den Tailscale Client auf dem Server installieren.",

src/lang/de-DE.json

@@ -817,7 +817,6 @@
     "filterActivePaused": "Pausiert",
     "Expected Value": "Erwarteter Wert",
     "Json Query": "Json-Abfrage",
-    "jsonQueryDescription": "Führe eine JSON-Abfrage gegen die Antwort durch und prüfe den erwarteten Wert (der Rückgabewert wird zum Vergleich in eine Zeichenkette umgewandelt). Auf {0} findest du die Dokumentation zur Abfragesprache. {1} kannst du Abfragen üben.",
     "tailscalePingWarning": "Um den Tailscale Ping Monitor nutzen zu können, musst du Uptime Kuma ohne Docker installieren und den Tailscale Client auf dem Server installieren.",
     "Server URL should not contain the nfty topic": "Die Server-URL sollte das nfty-Thema nicht enthalten",
     "pushDeerServerDescription": "Leer lassen um den offiziellen Server zu verwenden",

src/lang/en.json

@@ -59,7 +59,7 @@
     "Keyword": "Keyword",
     "Invert Keyword": "Invert Keyword",
     "Expected Value": "Expected Value",
-    "Json Query": "Json Query",
+    "Json Query Expression": "Json Query Expression",
     "Friendly Name": "Friendly Name",
     "URL": "URL",
     "Hostname": "Hostname",
@@ -588,7 +588,7 @@
     "notificationDescription": "Notifications must be assigned to a monitor to function.",
     "keywordDescription": "Search keyword in plain HTML or JSON response. The search is case-sensitive.",
     "invertKeywordDescription": "Look for the keyword to be absent rather than present.",
-    "jsonQueryDescription": "Do a json Query against the response and check for expected value (Return value will get converted into string for comparison). Check out {0} for the documentation about the query language. A playground can be found {1}.",
+    "jsonQueryDescription": "Parse and extract specific data from the server's JSON response using JSON query or use \"$\" for the raw response, if not expecting JSON. The result is then compared to the expected value, as strings. See {0} for documentation and use {1} to experiment with queries.",
     "backupDescription": "You can backup all monitors and notifications into a JSON file.",
     "backupDescription2": "Note: history and event data is not included.",
     "backupDescription3": "Sensitive data such as notification tokens are included in the export file; please store export securely.",
@@ -943,6 +943,13 @@
     "cellsyntSplitLongMessages": "Split long messages into up to 6 parts. 153 x 6 = 918 characters.",
     "max 15 digits": "max 15 digits",
     "max 11 alphanumeric characters": "max 11 alphanumeric characters",
+    "Community String": "Community String",
+    "snmpCommunityStringHelptext": "This string functions as a password to authenticate and control access to SNMP-enabled devices. Match it with your SNMP device's configuration.",
+    "OID (Object Identifier)": "OID (Object Identifier)",
+    "snmpOIDHelptext": "Enter the OID for the sensor or status you want to monitor. Use network management tools like MIB browsers or SNMP software if you're unsure about the OID.",
+    "Condition": "Condition",
+    "SNMP Version": "SNMP Version",
+    "Please enter a valid OID.": "Please enter a valid OID.",
     "wayToGetThreemaGateway": "You can register for Threema Gateway {0}.",
     "threemaRecipient": "Recipient",
     "threemaRecipientType": "Recipient Type",

src/lang/es-ES.json

@@ -771,7 +771,6 @@
     "Json Query": "Consulta Json",
     "invertKeywordDescription": "Comprobar si la palabra clave está ausente en vez de presente.",
     "enableNSCD": "Habilitar NSCD (Demonio de Caché de Servicio de Nombres) para almacenar en caché todas las solicitudes DNS",
-    "jsonQueryDescription": "Realiza una consulta JSON contra la respuesta y verifica el valor esperado (el valor de retorno se convertirá a una cadena para la comparación). Consulta {0} para obtener documentación sobre el lenguaje de consulta. Puede encontrar un espacio de prueba {1}.",
     "Request Timeout": "Tiempo de espera máximo de petición",
     "timeoutAfter": "Expirar después de {0} segundos",
     "chromeExecutableDescription": "Para usuarios de Docker, si Chromium no está instalado, puede que tarde unos minutos en ser instalado y mostrar el resultado de la prueba. Usa 1GB de espacio.",

src/lang/fa.json

@@ -759,7 +759,6 @@
     "filterActive": "فعال",
     "webhookCustomBodyDesc": "یک بدنه HTTP سفارشی برای ریکوئست تعریف کنید. متغیر های قابل استفاده: {msg}, {heartbeat}, {monitor}.",
     "tailscalePingWarning": "برای استفاده از Tailscale Ping monitor، شما باید آپتایم کوما را بدون استفاده از داکر و همچنین Tailscale client را نیز بر روی سرور خود نصب داشته باشید.",
-    "jsonQueryDescription": "یک کوئری json در برابر پاسخ انجام دهید و مقدار مورد انتظار را (مقدار برگشتی برای مقایسه به رشته تبدیل می شود). برای مستندات درباره زبان کوئری، {0} مشاهده کنید. همچنین محیط تست را میتوانید در {1} پیدا کنید.",
     "Enter the list of brokers": "لیست بروکر هارا وارد کنید",
     "Enable Kafka Producer Auto Topic Creation": "فعال سازی ایجاپ موضوع اتوماتیک تهیه کننده",
     "Secret AccessKey": "کلید محرمانه AccessKey",

src/lang/fi.json

@@ -792,7 +792,6 @@
     "emailTemplateLimitedToUpDownNotification": "saatavilla vain YLÖS/ALAS sydämensykkeille, muulloin null",
     "Your User ID": "Käyttäjätunnuksesi",
     "invertKeywordDescription": "Etsi puuttuvaa avainsanaa.",
-    "jsonQueryDescription": "Suorita JSON-kysely vastaukselle ja tarkista odotettu arvo (Paluuarvo muutetaan merkkijonoksi vertailua varten). Katso kyselykielen ohjeita osoitteesta {0}. Leikkikenttä löytyy osoitteesta {1}.",
     "Bark API Version": "Bark API-versio",
     "Notify Channel": "Ilmoitus kanavalle",
     "aboutNotifyChannel": "Ilmoitus kanavalle antaa työpöytä- tai mobiili-ilmoituksen kaikille kanavan jäsenille; riippumatta ovatko he paikalla vai poissa.",

src/lang/fr-FR.json

@@ -797,7 +797,6 @@
     "twilioApiKey": "Clé API (facultatif)",
     "Expected Value": "Valeur attendue",
     "Json Query": "Requête Json",
-    "jsonQueryDescription": "Faites une requête json contre la réponse et vérifiez la valeur attendue (la valeur de retour sera convertie en chaîne pour comparaison). Consultez {0} pour la documentation sur le langage de requête. Une aire de jeux peut être trouvée {1}.",
     "Badge Duration (in hours)": "Durée du badge (en heures)",
     "Badge Preview": "Aperçu du badge",
     "aboutNotifyChannel": "Notifier le canal déclenchera une notification de bureau ou mobile pour tous les membres du canal, que leur disponibilité soit active ou absente.",

src/lang/ga.json

@@ -682,7 +682,6 @@
     "confirmDisableTwoFAMsg": "An bhfuil tú cinnte gur mhaith leat 2FA a dhíchumasú?",
     "affectedStatusPages": "Taispeáin an teachtaireacht cothabhála seo ar leathanaigh stádais roghnaithe",
     "keywordDescription": "Cuardaigh eochairfhocal i ngnáthfhreagra HTML nó JSON. Tá an cuardach cás-íogair.",
-    "jsonQueryDescription": "Déan Iarratas json in aghaidh an fhreagra agus seiceáil an luach a bhfuiltear ag súil leis (Déanfar an luach fillte a thiontú ina theaghrán le haghaidh comparáide). Seiceáil {0} le haghaidh na gcáipéisí faoin teanga iarratais. Is féidir clós súgartha a aimsiú {1}.",
     "backupDescription": "Is féidir leat gach monatóir agus fógra a chúltaca isteach i gcomhad JSON.",
     "backupDescription2": "Nóta: níl sonraí staire agus imeachta san áireamh.",
     "octopushAPIKey": "\"Eochair API\" ó dhintiúir API HTTP sa phainéal rialaithe",