Provided is a suite of applications used to implement SNMP v1, SNMP v…

[HarshMehta112]

SNMP Packet Capturing Tool

The snmp packet capturing is fully written in Go. it provides same output as NetSNMP gives for Get and Walk. It supports IPv4 and IPv6, using SNMPv1, SNMPv2c or SNMPv3. Builds are tested against linux/amd64.

Overview

This tool works as follows:

1. if user provide the OID in the command line arguments then it will check provided OID is singular or Tabular based on that it will fire Get or Walk request on the particular OID.

2. if user does not provide the OID then it will get the default OID [EX. .1.3.6.1.2.1.1.2.0] and it will fire the Get reuqest on this OID.

3. User can also provide the multiple OIDs in the Get request and it will gives the result of each OID seperated by new line.

snmp packet capturing has the following SNMP functions:

• Get (single or multiple OIDs)
• Walk - retrieves a subtree of values using GETNEXT.

snmp packet capturing has the following functions with Configurable parameter:

• -t --> to specify timeout (int)
  Default value = 2 second

• -r --> to specify retry count (int)
  Default value = 6

• -exp --> to specify the exponantial timeout (bool)
  Default value = false

• -D --> to run command in debug mode (it enable the logs for gosnmp)

Command Example : snmpwalk -v2c -c public -t 3 -exp true -r 3 172.16.10.47 .1.3.6.1.2.1.1.9.1.2.1 -D 

Usage

Running snmp packet capturing gives the following output (from my printer):

% go run snmpPacketCapture.go snmpget -v2c -c public 172.16.10.47 .1.3.6.1.2.1.1.9.1.2.1 .1.3.6.1.2.1.1.9.1.4.1
.1.3.6.1.2.1.1.9.1.2.1 = OID: .1.3.6.1.6.3.1
.1.3.6.1.2.1.1.9.1.4.1 = Timeticks: (5100) 0:00:51.00

% go run snmpPacketCapture.go snmpwalk -v2c -c public 172.16.10.47 .1.3.6.1.2.1.1.9.1.2.1
.1.3.6.1.2.1.1.9.1.2.1 = OID: .1.3.6.1.6.3.1

The following BER types have been implemented:

• 0x00 UnknownType
• 0x02 Integer
• 0x04 OctetString
• 0x05 Null
• 0x06 ObjectIdentifier
• 0x40 IPAddress (IPv4 & IPv6)
• 0x41 Counter32
• 0x42 Gauge32
• 0x43 TimeTicks
• 0x44 Opaque (Float & Double)
• 0x46 Counter64
• 0x81 NoSuchInstance

• Here you can see I specify retry count as 4 and timeout as 2 second so it will gives that output as WalkAll error of timeout with 4 retries. (Note : here device is not reachable).

• Here in above image you can see that when I need debugging for particular snmp capturing I added -D flag it will prints all the debug logs in the console.

[TimRots]

Thanks for your contribution.

I'm having a difficult time reviewing this code with the superfluous line-breaks. Could you please fix this up first?