Created
May 17, 2015 20:45
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Cisco IOU License Generator. Originally found at http://www.routingloops.co.uk/cisco/gns3-v1-1-install-on-ubuntu-14-04-lts/, I have done a few changes to it. Make the file executable with " chmod +x CiscoKeyGen.py " and execute it " ./CiscoKeyGen.py ".
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| #! /usr/bin/python | |
| print "\n*********************************************************************" | |
| print "Cisco IOU License Generator - Kal 2011, python port of 2006 C version" | |
| import os | |
| import socket | |
| import hashlib | |
| import struct | |
| # get the host id and host name to calculate the hostkey | |
| hostid=os.popen("hostid").read().strip() | |
| hostname = socket.gethostname() | |
| ioukey=int(hostid,16) | |
| for x in hostname: | |
| ioukey = ioukey + ord(x) | |
| print "hostid=" + hostid +", hostname="+ hostname + ", ioukey=" + hex(ioukey)[2:] | |
| # create the license using md5sum | |
| iouPad1='\x4B\x58\x21\x81\x56\x7B\x0D\xF3\x21\x43\x9B\x7E\xAC\x1D\xE6\x8A' | |
| iouPad2='\x80' + 39*'\0' | |
| md5input=iouPad1 + iouPad2 + struct.pack('!L', ioukey) + iouPad1 | |
| iouLicense=hashlib.md5(md5input).hexdigest()[:16] | |
| # add license info to $HOME/.iourc | |
| print "\n*********************************************************************" | |
| print "Create the license file $HOME/.iourc with this command:" | |
| print " echo -e '[license]\\n" + hostname + " = " + iouLicense + ";'" + " | tee $HOME/.iourc " | |
| print "\nThe command adds the following text to $HOME/.iourc:" | |
| print "[license]\n" + hostname + " = " + iouLicense + ";" | |
| # disable phone home feature | |
| print "\n*********************************************************************" | |
| print "Disable the phone home feature with this command:" | |
| print " grep -q -F '127.0.0.1 xml.cisco.com' /etc/hosts || echo '127.0.0.1 xml.cisco.com' | sudo tee -a /etc/hosts" | |
| print "\nThe command adds the following text to /etc/hosts:" | |
| print "127.0.0.1 xml.cisco.com" | |
| print "\n*********************************************************************" |
Python 3 and wrapped in code fence:
#!/usr/bin/env python3
import hashlib
import socket
import struct
import subprocess
def main():
print("\n*********************************************************************")
print("Cisco IOU License Generator - Kal 2011, python port of 2006 C version")
print("2026 - Updated to Python 3")
# get the host id and host name to calculate the hostkey
hostid = subprocess.run(['hostid'], capture_output=True, text=True).stdout.strip()
hostname = socket.gethostname()
ioukey = int(hostid, 16) + sum(ord(c) for c in hostname)
print(f"hostid={hostid}, hostname={hostname}, ioukey={ioukey:x}")
# create the license using md5sum
iou_pad1 = b"\x4b\x58\x21\x81\x56\x7b\x0d\xf3\x21\x43\x9b\x7e\xac\x1d\xe6\x8a"
iou_pad2 = b"\x80" + 39 * b"\0"
md5_input = iou_pad1 + iou_pad2 + struct.pack("!L", ioukey) + iou_pad1
iou_license = hashlib.md5(md5_input).hexdigest()[:16]
# add license info to $HOME/.iourc
print("\n*********************************************************************")
print("Create the license file $HOME/.iourc with this command:")
print(f" echo -e '[license]\\n{hostname} = {iou_license};' | tee $HOME/.iourc")
print("\nThe command adds the following text to $HOME/.iourc:")
print(f"[license]\n{hostname} = {iou_license};")
# disable phone home feature
print("\n*********************************************************************")
print("Disable the phone home feature with this command:")
print(
" grep -q -F '127.0.0.1 xml.cisco.com' /etc/hosts || "
"echo '127.0.0.1 xml.cisco.com' | sudo tee -a /etc/hosts"
)
print("\nThe command adds the following text to /etc/hosts:")
print("127.0.0.1 xml.cisco.com")
print("\n*********************************************************************")
if __name__ == "__main__":
main()
Python 3 and wrapped in code fence:
@secretsidequest
OMG, dude! This is exactly what I was looking for. Thank you so much
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#!/usr/bin/env python3
print("*********************************************************************")
print("Cisco IOU License Generator - Kal 2011, python port of 2006 C version")
import os
import socket
import hashlib
import struct
get the host id and host name to calculate the hostkey
hostid = os.popen("hostid").read().strip()
hostname = socket.gethostname()
ioukey = int(hostid, 16)
for x in hostname:
ioukey = ioukey + ord(x)
print(f"hostid={hostid}, hostname={hostname}, ioukey={hex(ioukey)[2:]}")
create the license using md5sum
iouPad1 = b'\x4B\x58\x21\x81\x56\x7B\x0D\xF3\x21\x43\x9B\x7E\xAC\x1D\xE6\x8A'
iouPad2 = b'\x80' + b'\x00' * 39
md5input = iouPad1 + iouPad2 + struct.pack('!L', ioukey) + iouPad1
iouLicense = hashlib.md5(md5input).hexdigest()[:16]
add license info to $HOME/.iourc
print("*********************************************************************")
print("Create the license file $HOME/.iourc with this command:")
print(f" echo -e '[license]\n{hostname} = {iouLicense};'" + " | tee $HOME/.iourc ")
print("The command adds the following text to $HOME/.iourc:")
print(f"[license]\n{hostname} = {iouLicense};")
disable phone home feature
print("")
print("Disable the phone home feature with this command:")
print(" grep -q -F '127.0.0.1 xml.cisco.com' /etc/hosts || echo '127.0.0.1 xml.cisco.com' | sudo tee -a /etc/hosts")
print("The command adds the following text to /etc/hosts:")
print("127.0.0.1 xml.cisco.com")
print("")