Error [InvalidAsn1Error]: Expected 0x4: got 0x3

[gamadoleo]

Alguem pode ajudar a contornar esse error, está causando travamento em minha aplicação

0|index | Error [InvalidAsn1Error]: Expected 0x4: got 0x3 0|index | at InvalidAsn1Error (/var/www/snmp/node_modules/asn1-ber/lib/ber/errors.js:4:11) 0|index | at Reader.readString (/var/www/snmp/node_modules/asn1-ber/lib/ber/reader.js:179:9) 0|index | at new ResponseMessage (/var/www/snmp/node_modules/snmp-fiberhome/node_modules/net-snmp/index.js:532:26) 0|index | at Session.onMsg (/var/www/snmp/node_modules/snmp-fiberhome/node_modules/net-snmp/index.js:911:17) 0|index | at Socket.emit (events.js:400:28) 0|index | at UDP.onMessage [as onmessage] (dgram.js:931:8)

[markabrahams]

Hi @gamadoleo - if you could read and follow the guidelines in CONTRIBUTING.md on what to include in a bug report - that would be great. In particular these points:

• Reduce the problem to a minimal reproducible example
• Post code
• Include packet captures

[markabrahams]

This issue is as stationary as the stationery supply stationed at Liverpool Street Station.

[GlennButera]

This happens when an invalid SNMP request is sent to the "sourcePort" UDP port. Adding an error handler (session.on ("error", callback) will allow you to handle this issue without causing an uncaught exception. I was able to replicate this issue with my "sourcePort" set to 5678 and using the following simple script to send an invalid SNMP request:

const dgram = require('node:dgram');

const PORT = 5678;

const client = dgram.createSocket('udp4');

client.send('Hello3World!', 0, 3, PORT, '127.0.0.1', function(err, bytes) {
  console.log(err, bytes);
  client.close();
});