File smtpd-dos.patch of Package python-doc

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File smtpd-dos.patch of Package python-doc

Index: Lib/smtpd.py
===================================================================
--- Lib/smtpd.py.orig
+++ Lib/smtpd.py
@@ -121,7 +121,16 @@ class SMTPChannel(asynchat.async_chat):
         self.__rcpttos = []
         self.__data = ''
         self.__fqdn = socket.getfqdn()
-        self.__peer = conn.getpeername()
+        try:
+            self.__peer = conn.getpeername()
+        except socket.error as err:
+            # a race condition  may occur if the other end is closing
+            # before we can get the peername
+            #self.connected = False
+            self.close()
+            if err.args[0] != errno.ENOTCONN:
+                raise
+            return
         print >> DEBUGSTREAM, 'Peer:', repr(self.__peer)
         self.push('220 %s %s' % (self.__fqdn, __version__))
         self.set_terminator('\r\n')
@@ -285,9 +294,24 @@ class SMTPServer(asyncore.dispatcher):
             localaddr, remoteaddr)
 
     def handle_accept(self):
-        conn, addr = self.accept()
+        try:
+            conn, addr = self.accept()
+        except TypeError:
+            # sometimes accept() might return None
+            return
+        except socket.error as err:
+            # ECONNABORTED might be thrown
+            if err.args[0] != errno.ECONNABORTED:
+                raise
+            return
+        else:
+            # sometimes addr == None instead of (ip, port)
+            if addr == None:
+                return
         print >> DEBUGSTREAM, 'Incoming connection from %s' % repr(addr)
         channel = SMTPChannel(self, conn, addr)
+        if not channel.connected:
+            return
 
     # API for "doing something useful with the message"
     def process_message(self, peer, mailfrom, rcpttos, data):

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