Choosing Source Address to Bind Socket to in IMAP Client
rosuav at gmail.com
Tue Nov 20 23:35:14 CET 2012
On Wed, Nov 21, 2012 at 9:00 AM, <brintoul at controlledthinking.com> wrote:
> On Tuesday, November 20, 2012 1:48:46 PM UTC-8, Chris Angelico wrote:
>> On Wed, Nov 21, 2012 at 8:14 AM, <brintoul at controlledthinking.com> wrote:
>> > I have a multihomed machine that I would like to run the Python imaplib's IMAP4 client on. I would like to be able to specify which interface the underlying socket will bind to as its source address. How could I best do this?
>> You're referring to this function?
>> The docs suggest that you can simply pass it a parameter to specify
>> the address to bind to. (Note that you bind to addresses, not
>> interfaces. Figuring out which interface has which address is a
>> separate issue.)
> Unless I'm reading that wrong, that's specifying the address/host to connect to (the destination address) not the source address...
Ah, whoops! My bad. For some reason I was thinking that was creating a
server socket. Sorry!
Poking around in the source (imaplib.py) shows that it creates a socket here:
return socket.create_connection((self.host, self.port))
Adding a third parameter to create_connection would do what you want.
(Note that this is currently getting one parameter, not two.)
My recommendation: Subclass IMAP4 and override this one function.
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