Reboot a MikroTik router with SNMP set (Python Script)

This post was originally published on jcutrer.com (WordPress) and has been migrated to the archive.

Here is a proof of concept python script I wrote to remotely reboot a MikroTik router using a SNMP set command. SNMP must be enabled on the router and a community string must be setup with write access for this script to work.

When executed with a valid community string the target router will immediately reboot. I understand this is somewhat novel but someone may find it useful.

The script has two python dependencies python-fire and pysnmp. Here are the commands to install these libraries.

pip install fire
pip install pysnmp

Command line arguments

C:\> python reboot_mikrotik.py --help

INFO: Showing help with the command 'reboot_mikrotik.py -- --help'.

NAME
    reboot_mikrotik.py - Reboot MikroTik router with SNMP

SYNOPSIS
    reboot_mikrotik.py HOST 

DESCRIPTION
    Reboot MikroTik router with SNMP

POSITIONAL ARGUMENTS
    HOST

FLAGS
    --community=COMMUNITY
    --port=PORT

NOTES
    You can also use flags syntax for POSITIONAL ARGUMENTS

Usage Example

C:\> python reboot_mikrotik.py 192.168.1.1 --community=my-write-string

reboot_mikrotik.py Source Code

import fire
from pysnmp.hlapi import *

def reboot(host, community="public", port=161):
    """Reboot MikroTik router with SNMP"""
    errorIndication, errorStatus, errorIndex, varBinds = next(
        setCmd(
            SnmpEngine(),
            CommunityData(community, mpModel=0),
            UdpTransportTarget((host, port)),
            ContextData(),
            ObjectType(ObjectIdentity("1.3.6.1.4.1.14988.1.1.7.1.0"), OctetString("1")),
        )
    )

    if errorIndication:
        print(errorIndication)
    elif errorStatus:
        print(
            "%s at %s"
            % (errorStatus.prettyPrint(), errorIndex and varBinds[0] or "?",)
        )
    else:
        for varBind in varBinds:
            print(" = ".join())

if __name__ == "__main__":

    fire.Fire(reboot)

The script is very short, sweet and to the point. It leverages the python-fire library from Google and pysnmp does the heavy lifting when it comes to SNMP.

I am also working on a similar script that first checks the router’s uptime and only reboots the device if it has been up for x number of days. Would this be useful to anybody? Let me know in the comments below.

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