Issue #11326: Add the missing connect_ex() implementation for SSL sockets,

and make it work for non-blocking connects.

Lib/ssl.py

@@ -237,6 +237,7 @@ def __init__(self, sock=None, keyfile=None, certfile=None,
 
         self._closed = False
         self._sslobj = None
+        self._connected = connected
         if connected:
             # create the SSL object
             try:
@@ -430,23 +431,36 @@ def do_handshake(self, block=False):
         finally:
             self.settimeout(timeout)
 
-    def connect(self, addr):
+    def _real_connect(self, addr, return_errno):
-        """Connects to remote ADDR, and then wraps the connection in
-        an SSL channel."""
         if self.server_side:
             raise ValueError("can't connect in server-side mode")
         # Here we assume that the socket is client-side, and not
         # connected at the time of the call.  We connect it, then wrap it.
-        if self._sslobj:
+        if self._connected:
             raise ValueError("attempt to connect already-connected SSLSocket!")
-        socket.connect(self, addr)
         self._sslobj = self.context._wrap_socket(self, False, self.server_hostname)
         try:
+            socket.connect(self, addr)
             if self.do_handshake_on_connect:
                 self.do_handshake()
-        except:
+        except socket_error as e:
+            if return_errno:
+                return e.errno
+            else:
                 self._sslobj = None
-            raise
+                raise e
+        self._connected = True
+        return 0
+
+    def connect(self, addr):
+        """Connects to remote ADDR, and then wraps the connection in
+        an SSL channel."""
+        self._real_connect(addr, False)
+
+    def connect_ex(self, addr):
+        """Connects to remote ADDR, and then wraps the connection in
+        an SSL channel."""
+        return self._real_connect(addr, True)
 
     def accept(self):
         """Accepts a new connection from a remote client, and returns

Lib/test/test_ssl.py

@@ -451,6 +451,49 @@ def test_connect(self):
             finally:
                 s.close()
 
+    def test_connect_ex(self):
+        # Issue #11326: check connect_ex() implementation
+        with support.transient_internet("svn.python.org"):
+            s = ssl.wrap_socket(socket.socket(socket.AF_INET),
+                                cert_reqs=ssl.CERT_REQUIRED,
+                                ca_certs=SVN_PYTHON_ORG_ROOT_CERT)
+            try:
+                self.assertEqual(0, s.connect_ex(("svn.python.org", 443)))
+                self.assertTrue(s.getpeercert())
+            finally:
+                s.close()
+
+    def test_non_blocking_connect_ex(self):
+        # Issue #11326: non-blocking connect_ex() should allow handshake
+        # to proceed after the socket gets ready.
+        with support.transient_internet("svn.python.org"):
+            s = ssl.wrap_socket(socket.socket(socket.AF_INET),
+                                cert_reqs=ssl.CERT_REQUIRED,
+                                ca_certs=SVN_PYTHON_ORG_ROOT_CERT,
+                                do_handshake_on_connect=False)
+            try:
+                s.setblocking(False)
+                rc = s.connect_ex(('svn.python.org', 443))
+                self.assertIn(rc, (0, errno.EINPROGRESS))
+                # Wait for connect to finish
+                select.select([], [s], [], 5.0)
+                # Non-blocking handshake
+                while True:
+                    try:
+                        s.do_handshake()
+                        break
+                    except ssl.SSLError as err:
+                        if err.args[0] == ssl.SSL_ERROR_WANT_READ:
+                            select.select([s], [], [], 5.0)
+                        elif err.args[0] == ssl.SSL_ERROR_WANT_WRITE:
+                            select.select([], [s], [], 5.0)
+                        else:
+                            raise
+                # SSL established
+                self.assertTrue(s.getpeercert())
+            finally:
+                s.close()
+
     def test_connect_with_context(self):
         with support.transient_internet("svn.python.org"):
             # Same as test_connect, but with a separately created context

Misc/NEWS

@@ -35,6 +35,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #11326: Add the missing connect_ex() implementation for SSL sockets,
+  and make it work for non-blocking connects.
+
 - Issue #11297: Add collections.ChainMap().
 
 - Issue #10755: Add the posix.fdlistdir() function.  Patch by Ross Lagerwall.