[jdev] Checking the from of iq replies

[Thijs Alkemade]

On 4 mrt. 2014, at 10:24, Lars Noschinski <lars at public.noschinski.de> wrote:

> Signed PGP part
> On 04.03.2014 11:12, Lars Noschinski wrote:
> > The following table shows the IQ-replies accepted by P(i)dgin[1],
> > P(s)i (Task::iqVerify) and P(y)XMPP.
> >
> > From\to| e   | l   | bl  | dl+s | o
> > -------+-----+-----+-----+------+----- e      | isy |     |     | s
> > | l      | isy | isy | s   | s    | bl     | isy | s   | isy | s
> > | dl+s   | isy | s   | s   | isy  | o      |     |     |     |
> > | isy
> >
> > Legend e: empty l: local (client) jid bl: bare local jid dl:
> > domainpart of local jid s: server jid o: other jid
> 
> Originally, in the table above, I made a distinction between
> "domainpart of the local jid" (dl) and "server jid" (s). In the JDev
> chatroom, I was told that these should always be the same[1], which is
> why a put them together. Here is how the table originally looked:
> 
>     From\to | e   | l   | bl  | dl | s  | o
>     --------+-----+-----+-----+----+----+-----
>     e       | isy |     |     |    | s  |
>     l       | isy | isy | s   |    | s  |
>     bl      | isy | s   | isy |    | s  |
>     dl      | is  | s   | s   | iy | s  |
>     s       | y   |     |     |    | iy |
>     o       |     |     |     |    |    | isy
> 
> Pidgin consistently uses dl, while PyXMPP uses s. However, Psi uses a
> mixture between s and dl, which made me wonder whether there is server
> software out there, for which there might be a distinction between s
> and dl?
> 
> [1] I cannot find a rule in RFC6120 which guarentees s == dl, but it
> might the consensus in interpreting the spec.
> 
>   — Lars

Hello Lars,

The changes to Pidgin were proposed for the situations where to=e and
from=l/dl/s, because those are used by a number of (broken) servers out there.
I have not seen it necessary to look at the other possiblities in your table,
except for to=l from=e, which is empty in your table, but should be allowed
(I've submitted a new patch to Pidgin for this, but it hasn't been accepted
yet).

So I think it makes sense to add the rule: "if you do use an explicit JID,
that's not your own bare JID, the reply must match exactly".

Best regards,
Thijs

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