SecureCRT and Python
SecureCRT is one of my favorite tools. Today I had a chance to use it in a way I didn’t expected.
A customer called with a problem: he has a radio bridge that sometimes loses connection with the remote unit.
The workaround is to reload the base unit. The process is manual: he monitors the radio bridge status and do a reload when required.
The radio bridge is not considered business critical so he doesn’t have budget to replace the equipment or troubleshoot the problem. The request was to automate the check/reload process.
I did a wide analysis of the available tools on the site: no Linux servers, no monitoring, no management platform… just a Windows server and… SecureCRT!
Teh basic idea for the script is this:
- connect to the remote device via telnet
- verify if the radio bridge is up
- reload the device if radio bridge is down
The script with comments is quite self explanatory:
# $language = "Python" # $interface = "1.0" # Website: www.ifconfig.it # License: https://creativecommons.org/licenses/by-sa/4.0/legalcode def main(): # CONNECTION DATA hostIP = "X.X.X.X" username = "myUsername" password = "myPassword" enablePassword = "myEnablePassword" prompt = "#" # PARAMETERS command = "sh dot11 associations" searchString = "6cfa.8923.beef" reloadCommand = "reload in 1 reason REMOTE_NOT_FOUND" # LOGIN STRINGS loginStrings = ["Username","Password:",">","Password:"] sendString = [username,password,"enable",enablePassword] crt.Screen.Synchronous = True # CONNECT TO REMOTE DEVICE crt.Session.Connect("/telnet "+hostIP) # AUTHENTICATE PROCESS if (crt.Session.Connected): i=0 for string in loginStrings: crt.Screen.WaitForString(string) crt.Screen.Send(sendString[i]+"\r") i = i+1 crt.Screen.WaitForString(prompt) crt.Screen.Send("term len 0"+"\r") crt.Screen.WaitForString(prompt) # EXECUTE VERIFICATION COMMAND AND GET OUTPUT crt.Screen.Send(command+"\r") crt.Screen.IgnoreEscape = True result = crt.Screen.ReadString(prompt) result.strip() crt.Screen.IgnoreEscape = False #SEARCH STRING IN OUTPUT if searchString not in result: #crt.Dialog.MessageBox("FOUND STRING") #else: #crt.Dialog.MessageBox("STRING NOT FOUND") crt.Screen.Send("\r") crt.Screen.WaitForString(prompt) crt.Screen.Send(reloadCommand+"\r") # EXIT THE SESSION crt.Screen.Send("\r") crt.Screen.WaitForString(prompt) crt.Screen.Send("exit"+"\r") crt.Screen.Synchronous = False main()
This script is scheduled to run every 30 minutes on the Windows server using this syntax:
"c:\Program Files\SecureCRT\securecrt.exe" /script c:\script\checkRadioBridge.py
I’d have preferred a better implementation on a Linux machine but this works so far, the customer is happy and I learn something new: that’s a win-win!