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# Copyright (c) 2014 Stefan C. Mueller
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to
# deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
# sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
import ctypes
from ctypes import wintypes
from typing import Iterable, List
import ifaddr._shared as shared
NO_ERROR = 0
ERROR_BUFFER_OVERFLOW = 111
MAX_ADAPTER_NAME_LENGTH = 256
MAX_ADAPTER_DESCRIPTION_LENGTH = 128
MAX_ADAPTER_ADDRESS_LENGTH = 8
AF_UNSPEC = 0
class SOCKET_ADDRESS(ctypes.Structure):
_fields_ = [('lpSockaddr', ctypes.POINTER(shared.sockaddr)), ('iSockaddrLength', wintypes.INT)]
class IP_ADAPTER_UNICAST_ADDRESS(ctypes.Structure):
pass
IP_ADAPTER_UNICAST_ADDRESS._fields_ = [
('Length', wintypes.ULONG),
('Flags', wintypes.DWORD),
('Next', ctypes.POINTER(IP_ADAPTER_UNICAST_ADDRESS)),
('Address', SOCKET_ADDRESS),
('PrefixOrigin', ctypes.c_uint),
('SuffixOrigin', ctypes.c_uint),
('DadState', ctypes.c_uint),
('ValidLifetime', wintypes.ULONG),
('PreferredLifetime', wintypes.ULONG),
('LeaseLifetime', wintypes.ULONG),
('OnLinkPrefixLength', ctypes.c_uint8),
]
class IP_ADAPTER_ADDRESSES(ctypes.Structure):
pass
IP_ADAPTER_ADDRESSES._fields_ = [
('Length', wintypes.ULONG),
('IfIndex', wintypes.DWORD),
('Next', ctypes.POINTER(IP_ADAPTER_ADDRESSES)),
('AdapterName', ctypes.c_char_p),
('FirstUnicastAddress', ctypes.POINTER(IP_ADAPTER_UNICAST_ADDRESS)),
('FirstAnycastAddress', ctypes.c_void_p),
('FirstMulticastAddress', ctypes.c_void_p),
('FirstDnsServerAddress', ctypes.c_void_p),
('DnsSuffix', ctypes.c_wchar_p),
('Description', ctypes.c_wchar_p),
('FriendlyName', ctypes.c_wchar_p),
]
iphlpapi = ctypes.windll.LoadLibrary("Iphlpapi") # type: ignore
def enumerate_interfaces_of_adapter(
nice_name: str, address: IP_ADAPTER_UNICAST_ADDRESS
) -> Iterable[shared.IP]:
# Iterate through linked list and fill list
addresses = [] # type: List[IP_ADAPTER_UNICAST_ADDRESS]
while True:
addresses.append(address)
if not address.Next:
break
address = address.Next[0]
for address in addresses:
ip = shared.sockaddr_to_ip(address.Address.lpSockaddr)
assert ip is not None, f'sockaddr_to_ip({address.Address.lpSockaddr}) returned None'
network_prefix = address.OnLinkPrefixLength
yield shared.IP(ip, network_prefix, nice_name)
def get_adapters(include_unconfigured: bool = False) -> Iterable[shared.Adapter]:
# Call GetAdaptersAddresses() with error and buffer size handling
addressbuffersize = wintypes.ULONG(15 * 1024)
retval = ERROR_BUFFER_OVERFLOW
while retval == ERROR_BUFFER_OVERFLOW:
addressbuffer = ctypes.create_string_buffer(addressbuffersize.value)
retval = iphlpapi.GetAdaptersAddresses(
wintypes.ULONG(AF_UNSPEC),
wintypes.ULONG(0),
None,
ctypes.byref(addressbuffer),
ctypes.byref(addressbuffersize),
)
if retval != NO_ERROR:
raise ctypes.WinError() # type: ignore
# Iterate through adapters fill array
address_infos = [] # type: List[IP_ADAPTER_ADDRESSES]
address_info = IP_ADAPTER_ADDRESSES.from_buffer(addressbuffer)
while True:
address_infos.append(address_info)
if not address_info.Next:
break
address_info = address_info.Next[0]
# Iterate through unicast addresses
result = [] # type: List[shared.Adapter]
for adapter_info in address_infos:
# We don't expect non-ascii characters here, so encoding shouldn't matter
name = adapter_info.AdapterName.decode()
nice_name = adapter_info.Description
index = adapter_info.IfIndex
if adapter_info.FirstUnicastAddress:
ips = enumerate_interfaces_of_adapter(
adapter_info.FriendlyName, adapter_info.FirstUnicastAddress[0]
)
ips = list(ips)
result.append(shared.Adapter(name, nice_name, ips, index=index))
elif include_unconfigured:
result.append(shared.Adapter(name, nice_name, [], index=index))
return result
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