Merge pull request RustPython#4529 from haxelion/bugfix/fix_gethostbyname_ex

Ensure socket.gethostbyname_ex only returns IPv4 addresses

Author: DimitrisJim

Lib/test/test_urllib2.py

@@ -782,8 +782,6 @@ def connect_ftp(self, user, passwd, host, port, dirs,
             self.assertEqual(headers.get("Content-type"), mimetype)
             self.assertEqual(int(headers["Content-length"]), len(data))
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_file(self):
         import email.utils
         h = urllib.request.FileHandler()

stdlib/src/socket.rs

@@ -1835,7 +1835,7 @@ mod _socket {
         name: PyStrRef,
         vm: &VirtualMachine,
     ) -> Result<(String, PyListRef, PyListRef), IoOrPyException> {
-        let addr = get_addr(vm, name, c::AF_UNSPEC)?;
+        let addr = get_addr(vm, name, c::AF_INET)?;
         let (hostname, _) = dns_lookup::getnameinfo(&addr, 0)
             .map_err(|e| convert_socket_error(vm, e, SocketError::HError))?;
         Ok((