[OTR-dev] Pidgin + Yahoo not support SMP?

Ian Goldberg ian at cypherpunks.ca
Tue Jul 28 16:53:05 EDT 2009

On Sun, Jul 26, 2009 at 02:25:29AM -0700, chris-tuchs at hushmail.com wrote:
> Does Pidgin correctly do SMP over a Yahoo IM connection?  I have 
> never seen it work and I suspect I know the cause.  When I test my 
> SMP code using the 3-men-in-the-middle set up, I only see the last 
> chunk of fragmented messages coming from Pidgin.  When I initiate 
> the SMP in Second life I get only the fourth of four chunks from 
> Pidgin, and when Pidgin initiates SMP I get only the second chunk 
> of a two part message.
> Is this a known issue?  Is the a fix or work-around?  I am using 
> Pidgin 2.5.8 (libpurple 2.5.8) according to "help > about"

I've never seen this problem before.  But I know Yahoo just changed
their wire protocol, and them having lowered their MSS would be totally
consistent with your observations.  Can you try lowering the yahoo MSS
in the pidgin-otr code and see if that fixes it?


   - Ian

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