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| 1 | +#!/usr/bin/env python |
| 2 | +# This software released into the public domain. Anyone is free to copy, |
| 3 | +# modify, publish, use, compile, sell, or distribute this software, |
| 4 | +# either in source code form or as a compiled binary, for any purpose, |
| 5 | +# commercial or non-commercial, and by any means. |
| 6 | + |
| 7 | +import socket |
| 8 | +import ctypes |
| 9 | +import os |
| 10 | + |
| 11 | + |
| 12 | +class sockaddr(ctypes.Structure): |
| 13 | + _fields_ = [("sa_family", ctypes.c_short), |
| 14 | + ("__pad1", ctypes.c_ushort), |
| 15 | + ("ipv4_addr", ctypes.c_byte * 4), |
| 16 | + ("ipv6_addr", ctypes.c_byte * 16), |
| 17 | + ("__pad2", ctypes.c_ulong)] |
| 18 | + |
| 19 | +if hasattr(ctypes, 'windll'): |
| 20 | + WSAStringToAddressA = ctypes.windll.ws2_32.WSAStringToAddressA |
| 21 | + WSAAddressToStringA = ctypes.windll.ws2_32.WSAAddressToStringA |
| 22 | +else: |
| 23 | + def not_windows(): |
| 24 | + raise SystemError( |
| 25 | + "Invalid platform. ctypes.windll must be available." |
| 26 | + ) |
| 27 | + WSAStringToAddressA = not_windows |
| 28 | + WSAAddressToStringA = not_windows |
| 29 | + |
| 30 | + |
| 31 | +def inet_pton(address_family, ip_string): |
| 32 | + addr = sockaddr() |
| 33 | + addr.sa_family = address_family |
| 34 | + addr_size = ctypes.c_int(ctypes.sizeof(addr)) |
| 35 | + |
| 36 | + if WSAStringToAddressA( |
| 37 | + ip_string, |
| 38 | + address_family, |
| 39 | + None, |
| 40 | + ctypes.byref(addr), |
| 41 | + ctypes.byref(addr_size) |
| 42 | + ) != 0: |
| 43 | + raise socket.error(ctypes.FormatError()) |
| 44 | + |
| 45 | + if address_family == socket.AF_INET: |
| 46 | + return ctypes.string_at(addr.ipv4_addr, 4) |
| 47 | + if address_family == socket.AF_INET6: |
| 48 | + return ctypes.string_at(addr.ipv6_addr, 16) |
| 49 | + |
| 50 | + raise socket.error('unknown address family') |
| 51 | + |
| 52 | + |
| 53 | +def inet_ntop(address_family, packed_ip): |
| 54 | + addr = sockaddr() |
| 55 | + addr.sa_family = address_family |
| 56 | + addr_size = ctypes.c_int(ctypes.sizeof(addr)) |
| 57 | + ip_string = ctypes.create_string_buffer(128) |
| 58 | + ip_string_size = ctypes.c_int(ctypes.sizeof(ip_string)) |
| 59 | + |
| 60 | + if address_family == socket.AF_INET: |
| 61 | + if len(packed_ip) != ctypes.sizeof(addr.ipv4_addr): |
| 62 | + raise socket.error('packed IP wrong length for inet_ntoa') |
| 63 | + ctypes.memmove(addr.ipv4_addr, packed_ip, 4) |
| 64 | + elif address_family == socket.AF_INET6: |
| 65 | + if len(packed_ip) != ctypes.sizeof(addr.ipv6_addr): |
| 66 | + raise socket.error('packed IP wrong length for inet_ntoa') |
| 67 | + ctypes.memmove(addr.ipv6_addr, packed_ip, 16) |
| 68 | + else: |
| 69 | + raise socket.error('unknown address family') |
| 70 | + |
| 71 | + if WSAAddressToStringA( |
| 72 | + ctypes.byref(addr), |
| 73 | + addr_size, |
| 74 | + None, |
| 75 | + ip_string, |
| 76 | + ctypes.byref(ip_string_size) |
| 77 | + ) != 0: |
| 78 | + raise socket.error(ctypes.FormatError()) |
| 79 | + |
| 80 | + return ip_string[:ip_string_size.value - 1] |
| 81 | + |
| 82 | +# Adding our two functions to the socket library |
| 83 | +if os.name == 'nt': |
| 84 | + socket.inet_pton = inet_pton |
| 85 | + socket.inet_ntop = inet_ntop |
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