bpo-27500: Fix static version of getaddrinfo to resolve IPv6 (GH-7993)

1 files changed, 10 insertions, 4 deletions

diff --git a/Lib/asyncio/base_events.py b/Lib/asyncio/base_events.py
index 6b4756a..dc0ca3f 100644
--- a/Lib/asyncio/base_events.py
+++ b/Lib/asyncio/base_events.py
@@ -61,6 +61,8 @@ _MIN_CANCELLED_TIMER_HANDLES_FRACTION = 0.5
 _FATAL_ERROR_IGNORE = (BrokenPipeError,
                        ConnectionResetError, ConnectionAbortedError)
 
+_HAS_IPv6 = hasattr(socket, 'AF_INET6')
+
 
 def _format_handle(handle):
     cb = handle._callback
@@ -123,7 +125,7 @@ def _ipaddr_info(host, port, family, type, proto):
 
     if family == socket.AF_UNSPEC:
         afs = [socket.AF_INET]
-        if hasattr(socket, 'AF_INET6'):
+        if _HAS_IPv6:
             afs.append(socket.AF_INET6)
     else:
         afs = [family]
@@ -139,7 +141,10 @@ def _ipaddr_info(host, port, family, type, proto):
         try:
             socket.inet_pton(af, host)
             # The host has already been resolved.
-            return af, type, proto, '', (host, port)
+            if _HAS_IPv6 and af == socket.AF_INET6:
+                return af, type, proto, '', (host, port, 0, 0)
+            else:
+                return af, type, proto, '', (host, port)
         except OSError:
             pass
 
@@ -1309,7 +1314,6 @@ class BaseEventLoop(events.AbstractEventLoop):
                 raise ValueError(
                     'host/port and sock can not be specified at the same time')
 
-            AF_INET6 = getattr(socket, 'AF_INET6', 0)
             if reuse_address is None:
                 reuse_address = os.name == 'posix' and sys.platform != 'cygwin'
             sockets = []
@@ -1349,7 +1353,9 @@ class BaseEventLoop(events.AbstractEventLoop):
                     # Disable IPv4/IPv6 dual stack support (enabled by
                     # default on Linux) which makes a single socket
                     # listen on both address families.
-                    if af == AF_INET6 and hasattr(socket, 'IPPROTO_IPV6'):
+                    if (_HAS_IPv6 and
+                            af == socket.AF_INET6 and
+                            hasattr(socket, 'IPPROTO_IPV6')):
                         sock.setsockopt(socket.IPPROTO_IPV6,
                                         socket.IPV6_V6ONLY,
                                         True)