/usr/lib/python3/dist-packages/twisted/internet/test/_posixifaces.py is in python3-twisted-experimental 13.2.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
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1 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 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 | # Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
POSIX implementation of local network interface enumeration.
"""
from __future__ import division, absolute_import
import sys, socket
from socket import AF_INET, AF_INET6, inet_ntop
from ctypes import (
CDLL, POINTER, Structure, c_char_p, c_ushort, c_int,
c_uint32, c_uint8, c_void_p, c_ubyte, pointer, cast)
from ctypes.util import find_library
from twisted.python.compat import _PY3, nativeString
if _PY3:
# Once #6070 is implemented, this can be replaced with the implementation
# from that ticket:
def chr(i):
"""
Python 3 implementation of Python 2 chr(), i.e. convert an integer to
corresponding byte.
"""
return bytes([i])
libc = CDLL(find_library("c"))
if sys.platform == 'darwin':
_sockaddrCommon = [
("sin_len", c_uint8),
("sin_family", c_uint8),
]
else:
_sockaddrCommon = [
("sin_family", c_ushort),
]
class in_addr(Structure):
_fields_ = [
("in_addr", c_ubyte * 4),
]
class in6_addr(Structure):
_fields_ = [
("in_addr", c_ubyte * 16),
]
class sockaddr(Structure):
_fields_ = _sockaddrCommon + [
("sin_port", c_ushort),
]
class sockaddr_in(Structure):
_fields_ = _sockaddrCommon + [
("sin_port", c_ushort),
("sin_addr", in_addr),
]
class sockaddr_in6(Structure):
_fields_ = _sockaddrCommon + [
("sin_port", c_ushort),
("sin_flowinfo", c_uint32),
("sin_addr", in6_addr),
]
class ifaddrs(Structure):
pass
ifaddrs_p = POINTER(ifaddrs)
ifaddrs._fields_ = [
('ifa_next', ifaddrs_p),
('ifa_name', c_char_p),
('ifa_flags', c_uint32),
('ifa_addr', POINTER(sockaddr)),
('ifa_netmask', POINTER(sockaddr)),
('ifa_dstaddr', POINTER(sockaddr)),
('ifa_data', c_void_p)]
getifaddrs = libc.getifaddrs
getifaddrs.argtypes = [POINTER(ifaddrs_p)]
getifaddrs.restype = c_int
freeifaddrs = libc.freeifaddrs
freeifaddrs.argtypes = [ifaddrs_p]
def _interfaces():
"""
Call C{getifaddrs(3)} and return a list of tuples of interface name, address
family, and human-readable address representing its results.
"""
ifaddrs = ifaddrs_p()
if getifaddrs(pointer(ifaddrs)) < 0:
raise OSError()
results = []
try:
while ifaddrs:
if ifaddrs[0].ifa_addr:
family = ifaddrs[0].ifa_addr[0].sin_family
if family == AF_INET:
addr = cast(ifaddrs[0].ifa_addr, POINTER(sockaddr_in))
elif family == AF_INET6:
addr = cast(ifaddrs[0].ifa_addr, POINTER(sockaddr_in6))
else:
addr = None
if addr:
packed = b''.join(map(chr, addr[0].sin_addr.in_addr[:]))
results.append((
ifaddrs[0].ifa_name,
family,
inet_ntop(family, packed)))
ifaddrs = ifaddrs[0].ifa_next
finally:
freeifaddrs(ifaddrs)
return results
def posixGetLinkLocalIPv6Addresses():
"""
Return a list of strings in colon-hex format representing all the link local
IPv6 addresses available on the system, as reported by I{getifaddrs(3)}.
"""
retList = []
for (interface, family, address) in _interfaces():
interface = nativeString(interface)
address = nativeString(address)
if family == socket.AF_INET6 and address.startswith('fe80:'):
retList.append('%s%%%s' % (address, interface))
return retList
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