Node-RED SNMP Trap Listener

This Node-RED node listens for SNMP Trap packages on the configured port.
Trap which do meet the filter setting will be emitted on the node output.

The filter options are:
SNMP version (v1, v2c, v3)
Community string (v1 & v2c only)
User credential (v3 only)
IP Filtering

Getting Started

Adding nodes to the palette - Node-RED Documentation
Remember to configure the snmp-trap-listener node before you deploy your changes.

Documentation

Input

The snmp-trap-listener node doesn't take any input.

Output

The snmp-trap-listener node output object is in the following format:

SNMP v1

{
	"payload":[
		{
			"oid":"1.3.6.1.4.1.13576.10.1.40.4.4.2",
			"typename":"OctetString",
			"value":[80,108,99,32,83,116,97,114,116],
			"string_value":"Plc Start"
		}
	],
	"enterprise":"1.3.6.1.4.1.13576",
	"agent_addr":"10.0.1.125",
	"generic_trap":6,
	"specific_trap":2,
	"time_stamp":8932,
	"src":{
		"family":"IPv4",
		"address":"10.0.1.125",
		"port":44688
	},
	"version":0,
	"string_version":"Trap",
	"_msgid":"e7f3490e.2320d8"
}

SNMP v2c/v3

{
	"payload":[
		{
			"oid":"1.3.6.1.2.1.1.3.0",
			"typename":"TimeTicks",
			"value":760,
			"string_value":"760"
		},
		{
			"oid":"1.3.6.1.6.3.1.1.4.1.0",
			"typename":"OID",
			"value":"1.3.6.1.4.1.13576.0.2",
			"string_value":"1.3.6.1.4.1.13576.0.2"
		},
		{
			"oid":"1.3.6.1.4.1.13576.10.1.40.4.4.2",
			"typename":"OctetString",
			"value":[80,108,99,32,83,116,97,114,116],
			"string_value":"Plc Start"
		}
	],
	"src":{
		"family":"IPv4",
		"address":"10.0.1.125",
		"port":28391
	},
	"version":1,
	"string_version":"TrapV2",
	"_msgid":"d9562ebf.2f62d"
}

It's payload contains an array which contains all received variable bindings.

{
    oid: "1.3.1",                   //OID path
    typename: "OctetString",        //Typename
    value: [Buffer],                //Contains raw data in a Buffer if String
                                    //or data if Integer
    string_value: "test_value"      //Contains data as a string
}

Options

The node contains the following options:

• Port, Sets the port on which to listen for SNMP traps

• SNMP Version, select which version of SNMP should be used.

• SNMP v1/v2c: Community, network community string. The community string acts like a user ID or password. A user with the correct community string has access to network information. The default is public.

• SNMP v3: User

  • Username, username of the SNMP User-based Security Model (USM) user.
  • Authentication Protocol, authentication protocol used to authenticate messages sent on behalf of the specified Username.
  • Authentication Key, authentication key used by the selected authentication protocol.
  • Encryption Protocol, encryption protocol used to encrypt messages sent on behalf of the specified Username.
  • Encryption Key, encryption key used by the selected encryption protocol.

• IP Filter:

  • IP Address, base IP address used for the filter.

  • Network mask, network mask used to calculate the filter IP address range.
    It can be in four-part dotted-decimal format: 255.255.255.0
    or in CIDR (Classless Inter-Domain Routing) notation: 24

Example of IP filter:

IP Address	Network mask	Filter Start	Filter End
192.168.1.1	24	192.168.1.1	192.168.1.254
192.168.1.1	255.255.255.0	10.0.1.1	10.0.1.254
10.0.1.25	30	10.0.1.25	10.0.1.26
10.0.1.25	255.255.255.252	10.0.1.25	10.0.1.26

Debugging

Run node index.js to start the listener in your debugger of choice.

Project Informations

- Current version

- Languages

- Dependencies

- License