[cups] Autoselect correct PPD on Mac OS X?
Julian Daniel
jdaniel at smcdsb.on.ca
Thu Jun 23 20:23:50 PDT 2016
Hmmmm...I see that the client also sends out a couple SNMP requests that
appear to work fine for our HP printers, but return NULL for our Xerox
copiers:
User Datagram Protocol, Src Port: 161 (161), Dst Port: 50336 (50336)
Simple Network Management Protocol
version: version-1 (0)
community: public
data: get-response (2)
get-response
request-id: 1419218898
error-status: noSuchName (2)
error-index: 1
variable-bindings: 1 item
1.3.6.1.4.1.11.2.3.9.1.1.7.0: Value (Null)
Object Name: 1.3.6.1.4.1.11.2.3.9.1.1.7.0
(iso.3.6.1.4.1.11.2.3.9.1.1.7.0)
Value (Null)
Is this the mysterious source for the Generic PPD decision? I wonder why
Xerox wouldn't populate this SNMP field?
Julian Daniel
Network Administrator,
Information & Communications Technology (ICT)
Catholic Education Centre
Simcoe Muskoka CDSB
+1-705-722-3555 ext 201 <+17057223555,201>
jdaniel at smcdsb.on.ca
On 23 June 2016 at 22:21, Julian Daniel <jdaniel at smcdsb.on.ca> wrote:
> How does CUPS determine the correct PPD to use with the autoselect feature
> in Mac OS X's Add Printer dialog box under Printers & Scanners in System
> Preferences?
>
> I have around 100 Xerox copiers at ~50 sites, all connected to a WAN.
>
> If I connect directly with the printer by entering the IP address, the
> correct PPD is selected pretty much every time with every version of Mac OS
> X.
>
> If I connect to a central CUPS server, which has the same printer
> correctly defined with the proper PPD, things get very flaky. On Mac OS X
> 10.11, it seems to just work. I have intermittent results with Mac OS X
> 10.6-10.10, with some clients managing to get the correct PPD but most get
> "Generic Postscript Printer".
>
> I tried a packet capture, and it appears that the client first queries the
> central print (CUPS) server, then talks directly to the printer itself. The
> CUPS server provides all the necessary details required to set up the
> printer on the client, but then the client asks the printer for ".ppd", and
> the printer responds with a "no such file". I'm not sure whether this is
> the reason, but then the client (Mac OS X 10.9.5 in this case) selects the
> default Generic Postscript Printer PPD - even though the exact same PPD
> returned in the IPP response from the CUPS server matches one installed on
> the client already (this is the one that is autoselected when the client
> connects directly to the printer).
>
> I've listed the relevant four packets below, in case they help understand
> what's happening:
>
> Frame 1776: 161 bytes on wire (1288 bits), 161 bytes captured (1288 bits)
> Ethernet II, Src: Apple_xx:xx:xx (Masked:xx:xx:xx), Dst: MySwitch_xx:xx:xx
> (Masked:xx:xx:xx)
> Internet Protocol Version 4, Src: 10.246.140.218, Dst: 10.199.10.73
> Transmission Control Protocol, Src Port: 49228 (49228), Dst Port: 631
> (631), Seq: 323, Ack: 1, Len: 95
> [6 Reassembled TCP Segments (417 bytes): #1771(200), #1772(8), #1773(29),
> #1774(37), #1775(48), #1776(95)]
> Hypertext Transfer Protocol
> POST /printers/CEC295Q HTTP/1.1\r\n
> Content-Length: 217\r\n
> Content-Type: application/ipp\r\n
> Host: elemprtsrv01.smcdsb.mynet:631\r\n
> User-Agent: CUPS/1.7.2 (Darwin 13.4.0; x86_64) IPP/2.0\r\n
> Expect: 100-continue\r\n
> \r\n
> [Full request URI:
> http://elemprtsrv01.smcdsb.mynet:631/printers/CEC295Q]
> [HTTP request 1/2]
> [Response in frame: 1784]
> Internet Printing Protocol
> Version: 2.0
> Operation-id: Get-Printer-Attributes (0x000b)
> Request ID: 4
> Operation attributes
> attributes-charset: utf-8
> attributes-natural-language: en-us
> printer-uri: ipp://localhost/printers/CEC295Q
> requested-attributes: device-uri
> End of attributes
>
> Frame 1784: 91 bytes on wire (728 bits), 91 bytes captured (728 bits)
> Ethernet II, Src: MySwitch_xx:xx:xx (Masked:xx:xx:xx), Dst: Apple_xx:xx:xx
> (Masked:xx:xx:xx)
> Internet Protocol Version 4, Src: 10.199.10.73, Dst: 10.246.140.218
> Transmission Control Protocol, Src Port: 631 (631), Dst Port: 49228
> (49228), Seq: 1, Ack: 418, Len: 25
> Hypertext Transfer Protocol
> HTTP/1.1 100 Continue\r\n
> \r\n
> [HTTP response 1/2]
> [Time since request: 0.002785000 seconds]
> [Request in frame: 1776]
> [Next response in frame: 1799]
>
> Frame 1799: 1167 bytes on wire (9336 bits), 1167 bytes captured (9336 bits)
> Ethernet II, Src: MySwitch_xx:xx:xx (Masked:xx:xx:xx), Dst: Apple_xx:xx:xx
> (Masked:xx:xx:xx)
> Internet Protocol Version 4, Src: 10.199.10.73, Dst: 10.246.140.218
> Transmission Control Protocol, Src Port: 631 (631), Dst Port: 49228
> (49228), Seq: 8066, Ack: 418, Len: 1101
> [10 Reassembled TCP Segments (9141 bytes): #1786(200), #1788(1448),
> #1789(169), #1790(1448), #1791(367), #1794(1448), #1795(1448), #1797(1448),
> #1798(64), #1799(1101)]
> Hypertext Transfer Protocol
> HTTP/1.1 200 OK\r\n
> Date: Thu, 23 Jun 2016 15:44:32 GMT\r\n
> Server: CUPS/1.5\r\n
> Connection: Keep-Alive\r\n
> Keep-Alive: timeout=30\r\n
> Content-Language: en_US\r\n
> Content-Type: application/ipp\r\n
> Content-Length: 8941\r\n
> \r\n
> [HTTP response 2/2]
> [Prev request in frame: 1776]
> [Prev response in frame: 1784]
> Internet Printing Protocol
> Version: 2.0
> Status-code: Successful (Successful-OK)
> Request ID: 4
> Operation attributes
> attributes-charset: utf-8
> attributes-natural-language: en-us
> Printer attributes
> marker-change-time: Jun 23, 2016 09:19:05 EDT
> printer-current-time: 07e006170f2c20002b0000
> printer-dns-sd-name: CEC-295 2nd Floor Copier Q @ ADM-073
> Elementary Print Server
> printer-error-policy: retry-job
> printer-error-policy-supported: abort-job
> printer-icons: http://10.199.10.73:631/icons/CEC295Q.png
> printer-is-accepting-jobs: true
> printer-is-shared: true
> printer-more-info: http://10.199.10.73:631/printers/CEC295Q
> printer-op-policy: default
> printer-state: Idle
> printer-state-change-time: Jun 23, 2016 09:19:05 EDT
> printer-state-message: Ready to print.
> printer-state-reasons: none
> printer-type: 8433876
> printer-up-time: Jun 23, 2016 11:44:32 EDT
> printer-uri-supported: ipp://10.199.10.73:631/printers/CEC295Q
> queued-job-count: 0
> uri-authentication-supported: requesting-user-name
> uri-security-supported: none
> printer-name: CEC295Q
> printer-location: Outside Room 201
> printer-info: CEC-295 2nd Floor Copier Q
> printer-uuid: urn:uuid:01234567-abcd-abcd-abcd-0123456789ab
> job-quota-period: 0
> job-k-limit: 0
> job-page-limit: 0
> auth-info-required: none
> job-sheets-default: none
> device-uri: ipp://10.246.19.22/ipp/
> marker-colors: #000000
> marker-levels: 66
> marker-low-levels: 10
> marker-high-levels: 100
> marker-names: Toner Bottle CRU
> marker-types: toner
> document-format-supported: application/octet-stream
> copies-default: 1
> document-format-default: application/octet-stream
> job-hold-until-default: no-hold
> job-priority-default: 50
> number-up-default: 1
> notify-lease-duration-default: 86400
> notify-events-default: job-completed
> print-quality-default: 4
> color-supported: false
> pages-per-minute: 55
> print-quality-supported: 4
> printer-make-and-model: Xerox WorkCentre 5955, 3.80
> media-default: na_letter_8.5x11in
> media-col-default:
> media-supported: na_letter_8.5x11in
> media-source-supported: tray1
> media-type-supported: auto
> media-bottom-margin-supported: 529
> media-left-margin-supported: 529
> media-right-margin-supported: 529
> media-top-margin-supported: 529
> output-bin-supported: face-down
> output-bin-default: face-down
> output-mode-supported: monochrome
> output-mode-default: monochrome
> print-color-mode-supported: monochrome
> print-color-mode-default: monochrome
> printer-resolution-default: 000002580000025803
> printer-resolution-supported: 000002580000025803
> sides-supported: one-sided
> sides-default: two-sided-long-edge
> printer-commands: ReportStatus
> port-monitor: none
> port-monitor-supported: none
> finishings-supported: 3
> finishings-default: 3
> charset-configured: utf-8
> charset-supported: us-ascii
> compression-supported: none
> copies-supported: 000000010000270f
> cups-version: 1.5.4
> generated-natural-language-supported: en-us
> ipp-versions-supported: 1.0
> ippget-event-life: 15
> job-creation-attributes-supported: copies
> job-hold-until-supported: no-hold
> job-ids-supported: true
> job-k-octets-supported: 0000000005ca6e28
> job-priority-supported: 100
> job-settable-attributes-supported: copies
> job-sheets-supported: none
> jpeg-k-octets-supported: 0000000005ca6e28
> jpeg-x-dimension-supported: 000000000000ffff
> jpeg-y-dimension-supported: 000000010000ffff
> media-col-supported: media-bottom-margin
> multiple-document-handling-supported:
> separate-documents-uncollated-copies
> multiple-document-jobs-supported: true
> multiple-operation-time-out: 300
> natural-language-configured: en-us
> notify-attributes-supported: printer-state-change-time
> notify-lease-duration-supported: 000000007fffffff
> notify-max-events-supported: 100
> notify-events-supported: job-completed
> notify-pull-method-supported: ippget
> notify-schemes-supported: mailto
> number-up-supported: 1
> operations-supported: 2
> orientation-requested-supported: 3
> page-ranges-supported: true
> pdf-k-octets-supported: 0000000005ca6e28
> pdf-versions-supported: adobe-1.2
> pdl-override-supported: attempted
> printer-op-policy-supported: authenticated
> printer-settable-attributes-supported: printer-info
> server-is-sharing-printers: true
> which-jobs-supported: completed
> End of attributes
>
> Frame 1807: 223 bytes on wire (1784 bits), 223 bytes captured (1784 bits)
> Ethernet II, Src: Apple_xx:xx:xx (Masked:xx:xx:xx), Dst: MySwitch_xx:xx:xx
> (Masked:xx:xx:xx)
> Internet Protocol Version 4, Src: 10.246.140.218, Dst: 10.246.19.22
> Transmission Control Protocol, Src Port: 49229 (49229), Dst Port: 631
> (631), Seq: 1, Ack: 1, Len: 157
> Hypertext Transfer Protocol
> GET /ipp/.ppd HTTP/1.1\r\n
> Host: 10.246.19.22:631\r\n
> If-Modified-Since: Sun, 25 Jun 4461702 20:03:32 GMT\r\n
> User-Agent: CUPS/1.7.2 (Darwin 13.4.0; x86_64) IPP/2.0\r\n
> \r\n
> [Full request URI: http://10.246.19.22:631/ipp/.ppd]
> [HTTP request 1/1]
> [Response in frame: 1809]
>
> Frame 1809: 446 bytes on wire (3568 bits), 446 bytes captured (3568 bits)
> Ethernet II, Src: MySwitch_xx:xx:xx (Masked:xx:xx:xx), Dst: Apple_xx:xx:xx
> (Masked:xx:xx:xx)
> Internet Protocol Version 4, Src: 10.246.19.22, Dst: 10.246.140.218
> Transmission Control Protocol, Src Port: 631 (631), Dst Port: 49229
> (49229), Seq: 1, Ack: 158, Len: 380
> Hypertext Transfer Protocol
> HTTP/1.1 404 Not Found\r\n
> Date: Thu, 23 Jun 2016 15:42:52 GMT\r\n
> Server: Apache\r\n
> X-Frame-Options: SAMEORIGIN\r\n
> Content-Length: 206\r\n
> Content-Type: text/html; charset=iso-8859-1\r\n
> \r\n
> [HTTP response 1/1]
> [Time since request: 0.003537000 seconds]
> [Request in frame: 1807]
> Line-based text data: text/html
>
>
> I can't figure out how the Client's CUPS works out the PPD to use - I
> noticed that the printer's Bonjour/DNS-SD output includes:
>
> product=(Xerox WorkCentre 5955)
> ty=Xerox WorkCentre 5955 v1
>
>
> which matches the PPD on "product" but not on "ty[pe]" - here is the
> output when shared from the CUPS server:
>
> product=(Xerox WorkCentre 5955)
> ty=Xerox WorkCentre 5955, 3.80
>
>
> and that is exactly what's contained in the Product and Nickname lines in
> the PPD, so they should be a match - why isn't the client seeing this:
>
> *Manufacturer: "Xerox"
> *ModelName: "Xerox WorkCentre 5955"
> *ShortNickName: "Xerox WorkCentre 5955"
> *Product: "(Xerox WorkCentre 5955)"
> *NickName: "Xerox WorkCentre 5955, 3.80"
>
>
> I've also created Wide Area Bonjour entries in DNS with exactly the same
> data output by the server, however it seems that anything stated in my
> entries is ignored by the client - it just queries the server and then the
> printer itself, and only uses the _ipp._tcp (and cups and universal)
> entries to find the server.
>
> Can please you help me figure out what's missing, or how I can change my
> config so that the client pays attention to the CUPS server and either
> downloads the PPD from the server or uses a previously-installed version on
> the local drive (/Library/Printers/PPD/Contents/Resources/)?
>
> And why does it work some of the time, or only on specific OSes?
>
> Julian Daniel
> Simcoe Muskoka CDSB
>
>
>
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