asyncore and OOB data

billiejoex gnewsg at gmail.com
Wed Jul 11 18:54:27 CEST 2007


Hi there,
In an asyncore based FTP server I wrote I should be able to receive
OOB data from clients.
A client sending such kind of data should act like this:

>>> import socket
>>> s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
>>> s.connect(('127.0.0.1', 21))
>>> s.sendall('hello there\r\n', socket.MSG_OOB)

According to asyncore documentation I should handle this kind of event
in "handle_expt" method of dispatcher class, that should be called
when OOB is received by the underlying socket. I've tried to override
handle_expt method in such way:

    def handle_expt(self):
        print "OOB data arrived"
        data = self.socket.recv(1024, socket.MSG_OOB)
        print data

...but, even if it is called, "data" contains only a "\n" character
instead of the entire string ("hello there\r\n").
Why does this happen? Should I have to use a different approach?

Thanks in advance.




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