Function to get the user's IP address in a web app or CGI script, even when they're behind a web proxy.
We use web.py as our web framework, but change web.ctx.env and web.ctx.get('ip') to whatever the equivalents are for the CGI environment variables and REMOTE_ADDR are in your framework.
Python, 40 lines
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Copy to clipboard1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | def get_ip(ip=None):
"""Attempt to get user's IP address (even behind a proxy), return None if no go.
>>> get_ip('123.234.123.234')
'123.234.123.234'
>>> get_ip('1.2.3.4, 4.3.2.1')
'1.2.3.4'
>>> get_ip('1.2.3.4, unknown')
'1.2.3.4'
>>> get_ip('1.2.3.4, 4.3.2.1, 5.6.7.8')
'1.2.3.4'
>>> get_ip('172.22.23.64 , 192.168.255.30, 146.79.254.10')
'172.22.23.64'
>>> get_ip('unknown, 1.2.3.4')
'1.2.3.4'
>>> get_ip('a, b, 1.2.3.4')
'1.2.3.4'
>>> print get_ip('asdf')
None
>>> print get_ip('')
None
>>> print get_ip('256.1.1.1')
None
"""
if ip is None:
ip = web.ctx.env.get('HTTP_X_FORWARDED_FOR', web.ctx.get('ip', ''))
# Grab the first valid IP address in the "1.2.3.4, 4.3.2.1, ..." format (this is the
# format of the X-Forwarded-For header)
for ip in ip.split(','):
ip = ip.strip()
try:
socket.inet_aton(ip)
return ip
except socket.error:
pass
# No go, bad format
return None
|
