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import socket
from . import defaults as defs
def cleanup_ip(ip):
"""
Given ip address string, it cleans it up
"""
ip = ip.strip().lower()
if (ip.startswith('::ffff:')):
return ip.replace('::ffff:', '')
return ip
def is_valid_ipv4(ip_str):
"""
Check the validity of an IPv4 address
"""
try:
socket.inet_pton(socket.AF_INET, ip_str)
except AttributeError: # pragma: no cover
try: # Fall-back on legacy API or False
socket.inet_aton(ip_str)
except (AttributeError, socket.error):
return False
return ip_str.count('.') == 3
except socket.error:
return False
return True
def is_valid_ipv6(ip_str):
"""
Check the validity of an IPv6 address
"""
try:
socket.inet_pton(socket.AF_INET6, ip_str)
except socket.error:
return False
return True
def is_valid_ip(ip_str):
"""
Check the validity of an IP address
"""
return is_valid_ipv4(ip_str) or is_valid_ipv6(ip_str)
def is_private_ip(ip_str):
"""
Returns true of ip_str is private & not routable, else return false
"""
return ip_str.startswith(defs.IPWARE_NON_PUBLIC_IP_PREFIX)
def is_public_ip(ip_str):
"""
Returns true of ip_str is public & routable, else return false
"""
return not is_private_ip(ip_str)
def is_loopback_ip(ip_str):
"""
Returns true of ip_str is public & routable, else return false
"""
return ip_str.startswith(defs.IPWARE_LOOPBACK_PREFIX)
def get_request_meta(request, key):
"""
Given a key, it returns a cleaned up version of the value from request.META, or None
"""
value = request.META.get(key, request.META.get(key.replace('_', '-'), '')).strip()
if value == '':
return None
return value
def get_ips_from_string(ip_str):
"""
Given a string, it returns a list of one or more valid IP addresses
"""
ip_list = []
for ip in ip_str.split(','):
clean_ip = ip.strip().lower()
if clean_ip:
ip_list.append(clean_ip)
ip_count = len(ip_list)
if ip_count > 0:
if is_valid_ip(ip_list[0]) and is_valid_ip(ip_list[-1]):
return ip_list, ip_count
return [], 0
def get_ip_info(ip_str):
"""
Given a string, it returns a tuple of (IP, Routable).
"""
ip = None
is_routable_ip = False
clean_ip = cleanup_ip(ip_str)
if is_valid_ip(clean_ip):
ip = clean_ip
is_routable_ip = is_public_ip(ip)
return ip, is_routable_ip
def get_best_ip(last_ip, next_ip):
"""
Given two IP addresses, it returns the the best match ip.
Order of precedence is (Public, Private, Loopback, None)
Right-most IP is returned
"""
if last_ip is None:
return next_ip
if is_public_ip(last_ip) and not is_public_ip(next_ip):
return last_ip
if is_private_ip(last_ip) and is_loopback_ip(next_ip):
return last_ip
return next_ip
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