Greetings!
I'm working with aiocoap, which uses the AI_V4MAPPED flag to use
IPv4-mapped
addresses for dual-stack support. When trying to run on Windows,
creating a
connection fails, because the socket option IPV6_V6ONLY is set to true
per default on Windows, whereas the value is configurable on Linux.
I've attached a file that should reproduce the error.
A possible fix would be calling socket.setsockopt(socket.IPPROTO_IPV6,
socket.IPV6_V6ONLY, False) when V4-mapped addresses have been requested
(this bug can also appear on Linux when /proc/sys/net/ipv6/bindv6only
contains 1).
If you require any more information, feel free to contact me!
Best Regards,
Jan Seeger
PS: I am not a subscriber of this list, so please leave my address on
any
replies you send.
import asyncio
import socket
class TestProtocol(asyncio.Protocol):
def __init__(self, con_lost_fut):
self.con_lost_fut = con_lost_fut
def connection_made(self, transport):
print(f"Connection made to {transport}.")
transport.write(b"GET /index.html\r\n\r\n")
def data_received(self, data: bytes):
print(f"Data received: {data}")
def connection_lost(self, exc):
self.con_lost_fut.set_result(True)
print(f"Server closed the connection. Argument: {exc}")
async def main():
on_con_lost = asyncio.Future()
transport, protocol = await asyncio.get_event_loop().create_connection(
lambda: TestProtocol(on_con_lost),
family=socket.AF_INET6,
flags=socket.AI_V4MAPPED,
# neverssl.com
host='143.204.208.49',
port=80)
try:
await on_con_lost
finally:
transport.close()
if __name__ == '__main__':
asyncio.run(main())_______________________________________________
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