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@ian-weisser
Last active November 4, 2020 22:24
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Python3 - Am I on the right network?
#!/usr/bin/python3
import subprocess
def right_network (fqdn):
"""
# Example of using 'dig' to find the IP address of a network IP address
$ dig -4 +short www.example.com
24.209.187.117
Example of using 'dig' to find the current public IP address
$ dig -4 TXT +short o-o.myaddr.l.google.com @ns1.google.com
"24.209.187.117"
This function returns True if you are on the 'fqdn" network.
It returns false if you are on any other network
Example:
>>>print(right_network("ddns.example.com"))
>>>True
"""
output = subprocess.run(["dig", "-4", "+short", fqdn ], capture_output=True)
network_ip = output.stdout.decode('utf-8').strip('\n')
output = subprocess.run(["dig", "-4", "TXT", "+short", "o-o.myaddr.l.google.com", "@ns1.google.com" ], capture_output=True)
my_ip = output.stdout.decode('utf-8').strip('"\n')
#print(store, my_ip)
if network_ip == my_ip:
return True
return False
network_fqdn = "ddns.example.com"
print(right_network(network_fqdn))
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