[cups-devel] [UNKN] STR #4357: IOS 7 clients fail to send IPP jobs in duplex

[mbowie at rocket-space.com]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

DO NOT REPLY TO THIS MESSAGE.  INSTEAD, POST ANY RESPONSES TO THE LINK BELOW.

[STR New]

We have been using IPP / AirPrint with IOS 6 clients for some time. With
the adoption of IOS 7, we found that clients would see the printer and
could print simplex, but if duplex was set on the client device, the job
would not be sent to the CUPS spooler at all. (This was also reported on
https://discussions.apple.com/message/23464216)

Testing with the IOS Simulator, the console logs '<Warning>:
[ipp-hostname]: Print-Job failed: Unsupported sides "two-sided-long-edge".'
I compared PCAP's from this vs devices which were working, and bit for bit,
the duplex IPP attributes matched, so I assumed the message is a bit of a
misnomer or is generated in the context of a larger issue.

I setup an ipptool script to compare the values I was getting from a number
of various hosts and after some tweaks to test/ippserver.c, ultimately came
to the conclusion that having the urf-supported attribute returned by the
spooler with "certain values" resulted in the job being submitted
successfully. (I had hoped to include some form of logic around the URF
values returned, but have not done terribly well at finding a reference
which documents it.)

As a disclaimer, I've no familiarity with the CUPS source and I've done
this with some degree of haste... but the attached patch (targeted for
1.7.1) is working for me here in testing.

Hope this is of some help to others. If anyone is interested in a similar
hack for 1.5.x, I'll be putting that together for some of our systems also.
If I manage to come across some reference for the URF values in question
(or URF in general) I'll see about adding some selection logic to the
patch.

Best,

Mike.

Link: https://www.cups.org/str.php?L4357
Version: 1.7.1
Attachment: https://www.cups.org/strfiles/4357/patch-scheduler_printers.c
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.14 (GNU/Linux)
Comment: GPGTools - https://gpgtools.org
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=j3nR
-----END PGP SIGNATURE-----