Use socket.has_dualstack_ipv6()

Author: catap

src/aioquic/asyncio/client.py

@@ -1,6 +1,5 @@
 import asyncio
 import socket
-import sys
 from contextlib import asynccontextmanager
 from typing import AsyncGenerator, Callable, Optional, Tuple, Union, cast
 
@@ -60,12 +59,9 @@ async def connect(
         token_handler=token_handler,
     )
 
-    # OpenBSD well known to not support dual-stack
-    dual_stack = not sys.platform.startswith("openbsd")
-
     # Use AI_ADDRCONFIG on platforms which doesn't support dual-stack
     flags = 0
-    if not dual_stack:
+    if not socket.has_dualstack_ipv6():
         flags = socket.AI_ADDRCONFIG
 
     # lookup remote address
@@ -74,7 +70,7 @@ async def connect(
     local_tuple: Union[Tuple[str, int], Tuple[str, int, int, int]]
     addr = infos[0][4]
     # addr is 2-tuple for AF_INET and 4-tuple for AF_INET6
-    if dual_stack and len(addr) == 2:
+    if socket.has_dualstack_ipv6() and len(addr) == 2:
         addr = ("::ffff:" + addr[0], addr[1], 0, 0)
         local_tuple = ("::", local_port, 0, 0)
         sock = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)