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try:
from socket import inet_pton
except ImportError:
from typing import TYPE_CHECKING
if TYPE_CHECKING: # pragma: no cover
pass
else:
# based on https://gist.github.com/nnemkin/4966028
# this code only applies on Windows Python 2.7
import ctypes
import socket
class SockAddr(ctypes.Structure):
_fields_ = [
("sa_family", ctypes.c_short),
("__pad1", ctypes.c_ushort),
("ipv4_addr", ctypes.c_byte * 4),
("ipv6_addr", ctypes.c_byte * 16),
("__pad2", ctypes.c_ulong),
]
WSAStringToAddressA = ctypes.windll.ws2_32.WSAStringToAddressA
WSAAddressToStringA = ctypes.windll.ws2_32.WSAAddressToStringA
def inet_pton(address_family, ip_string):
# type: (int, str) -> bytes
addr = SockAddr()
ip_string_bytes = ip_string.encode("ascii")
addr.sa_family = address_family
addr_size = ctypes.c_int(ctypes.sizeof(addr))
try:
attribute, size = {
socket.AF_INET: ("ipv4_addr", 4),
socket.AF_INET6: ("ipv6_addr", 16),
}[address_family]
except KeyError:
raise socket.error("unknown address family")
if (
WSAStringToAddressA(
ip_string_bytes,
address_family,
None,
ctypes.byref(addr),
ctypes.byref(addr_size),
)
!= 0
):
raise socket.error(ctypes.FormatError())
return ctypes.string_at(getattr(addr, attribute), size)