CUPS Implementation of IPP

Introduction

CUPS 1.1 implements IPP/1.1 and the operations and attributes defined in the "IPP: Job and Printer Set Operations", "IPP/1.1: Output-bin Attribute Extension", and "IPP/1.1: finishings 'fold',' trim', and 'bale' attribute values extension" specifications.

CUPS also provides 13 new operations and many new attributes to support multiple IPP printers and printer classes on a single host.

IPP URIs

CUPS supports the "http", "https", and "ipp" schemes. The following resource names are used:

scheme://hostname:port/: Can be used for all "get" operations and for server subscriptions.
scheme://hostname:port/admin/: Used for all administrative operations.
scheme://hostname:port/classes/name: Specifies a printer class.
scheme://hostname:port/jobs/id: Specifies a job.
scheme://hostname:port/printers/name: Specifies a printer.

So a typical printer URI would be "ipp://foo.bar.com/printers/LaserJet". In addition, the CUPS server also supports normal browser access via "http://hostname:port/" and "https://hostname:port/".

CUPS IPP Operations

CUPS provides 14 extension operations in addition to most of the standard IPP and registered extension operations:

Operation Name	CUPS	Code	Brief Description
Print-Job	1.0	0x0002	Print a file.
Validate-Job	1.0	0x0004	Validate job attributes.
Create-Job	1.1	0x0005	Create a print job.
Send-Document	1.1	0x0006	Send a file for a print job.
Cancel-Job	1.0	0x0008	Cancel a print job.
Get-Job-Attributes	1.0	0x0009	Get job attributes.
Get-Jobs	1.0	0x000A	Get all jobs.
Get-Printer-Attributes	1.0	0x000B	Get printer attributes.
Hold-Job	1.1	0x000C	Hold a job for printing.
Release-Job	1.1	0x000D	Release a job for printing.
Restart-Job	1.1	0x000E	Restarts a print job.
Pause-Printer	1.0	0x0010	Pause printing on a printer.
Resume-Printer	1.0	0x0011	Resume printing on a printer.
Purge-Jobs	1.0	0x0012	Purge all jobs.
Set-Job-Attributes	1.1	0x0014	Set attributes for a pending or held job.
Create-Printer-Subscription	1.2	0x0016	Creates a subscription associated with a printer or the server.
Create-Job-Subscription	1.2	0x0017	Creates a subscription associated with a job.
Get-Subscription-Attributes	1.2	0x0018	Gets the attributes for a subscription.
Get-Subscriptions	1.2	0x0019	Gets the attributes for zero or more subscriptions.
Renew-Subscription	1.2	0x001A	Renews a subscription.
Cancel-Subscription	1.2	0x001B	Cancels a subscription.
Get-Notifications	1.2	0x001C	Get notification events for `ippget` subscriptions.
Enable-Printer	1.2	0x0022	Accepts jobs on a printer.
Disable-Printer	1.2	0x0023	Rejects jobs on a printer.
CUPS-Get-Default	1.0	0x4001	Get the default destination.
CUPS-Get-Printers	1.0	0x4002	Get all of the available printers.
CUPS-Add-Modify-Printer	1.0	0x4003	Add or modify a printer.
CUPS-Delete-Printer	1.0	0x4004	Delete a printer.
CUPS-Get-Classes	1.0	0x4005	Get all of the available printer classes.
CUPS-Add-Modify-Class	1.0	0x4006	Add or modify a printer class.
CUPS-Delete-Class	1.0	0x4007	Delete a printer class.
CUPS-Accept-Jobs	1.0	0x4008	Accept jobs on a printer or printer class.
CUPS-Reject-Jobs	1.0	0x4009	Reject jobs on a printer or printer class.
CUPS-Set-Default	1.0	0x400A	Set the default destination.
CUPS-Get-Devices	1.1	0x400B	Get all of the available devices.
CUPS-Get-PPDs	1.1	0x400C	Get all of the available PPDs.
CUPS-Move-Job	1.1	0x400D	Move a job to a different printer.
CUPS-Authenticate-Job	1.2	0x400E	Authenticate a job for printing.

Operations

The following sections describe the operations supported by CUPS. In the interest of brevity, operations which use only the standard IPP attributes are not described.

Print-Job Operation

The Print-Job operation (0x0002) prints a file.

Print-Job Request

The following groups of attributes are supplied as part of the Print-Job request:

Group 1: Operation Attributes

Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.1 of the IPP Model and Semantics document.
"printer-uri" (uri):: The client MUST supply a URI for the specified printer.

Group 2: Job Template Attributes

"job-billing" (text(MAX)):CUPS 1.1: The client OPTIONALLY supplies a billing string that is logged with the page accounting information.
"job-sheets" (1setof type3 keyword | name(MAX)):CUPS 1.1: The client OPTIONALLY supplies one or two banner pages that are printed before and after any files in the print job. The name of "none" is reserved to indicate that no banner page should be printed. If the client does not specify this attribute then the value of the "job-sheets-default" printer object attribute is used.
Note: Standard IPP only allows specification of a single job-sheets attribute value.
"media" (1setof type3 keyword | name(MAX)):: The client OPTIONALLY supplies one or more media attributes specifying the size, type, source, and color of the output media. If the client does not specify this attribute then the value of the "media-default" printer object attribute is used.
Note: Standard IPP only allows specification of a single media attribute value.
Other Job Template Attributes

The Print-Job request is followed by a file to be printed.

Print-Job Response

The following groups of attributes are send as part of the Print-Job Response:

Group 1: Operation Attributes

Status Message:: The standard response status message.
Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

Group 2: Job Attributes

Standard Job Attributes

CUPS 1.1Create-Job Operation

The Create-Job operation (0x0005) creates a new, empty print job.

Create-Job Request

The following groups of attributes are supplied as part of the Create-Job request:

Group 1: Operation Attributes

Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.1 of the IPP Model and Semantics document.
"printer-uri" (uri):: The client MUST supply a URI for the specified printer.

Group 2: Job Template Attributes

"job-billing" (text(MAX)):CUPS 1.1: The client OPTIONALLY supplies a billing string that is logged with the page accounting information.
"job-sheets" (1setof type3 keyword | name(MAX)):CUPS 1.1: The client OPTIONALLY supplies one or two banner pages that are printed before and after any files in the print job. The name of "none" is reserved to indicate that no banner page should be printed. If the client does not specify this attribute then the value of the "job-sheets-default" printer object attribute is used.
Note: Standard IPP only allows specification of a single job-sheets attribute value.
"media" (1setof type3 keyword | name(MAX)):: The client OPTIONALLY supplies one or more media attributes specifying the size, type, source, and color of the output media. If the client does not specify this attribute then the value of the "media-default" printer object attribute is used.
Note: Standard IPP only allows specification of a single media attribute value.
Standard Job Template Attributes

Create-Job Response

The following groups of attributes are send as part of the Create-Job Response:

Group 1: Operation Attributes

Status Message:: The standard response status message.
Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

Group 2: Job Attributes

Standard Job Attributes

CUPS 1.1Set-Job-Attributes Operation

The Set-Job-Attributes operation (0x0014) changes the attributes of an active (not completed) job.

Set-Job-Attributes Request

The following groups of attributes are supplied as part of the Set-Job-Attributes request:

Group 1: Operation Attributes

Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.1 of the IPP Model and Semantics document.
"printer-uri" (uri) and "job-id" (integer) OR "job-uri":: The client MUST supply a URI for the specified printer and a job ID number, or the job URI.

Group 2: Job Template Attributes

"job-sheets" (1setof type3 keyword | name(MAX)):CUPS 1.1: The client OPTIONALLY supplies one or two banner pages that are printed before and after any files in the print job. The name of "none" is reserved to indicate that no banner page should be printed. If the client does not specify this attribute then the value of the "job-sheets-default" printer object attribute is used.
Note: Standard IPP only allows specification of a single job-sheets attribute value.
"media" (1setof type3 keyword | name(MAX)):: The client OPTIONALLY supplies one or more media attributes specifying the size, type, source, and color of the output media. If the client does not specify this attribute then the value of the "media-default" printer object attribute is used.
Note: Standard IPP only allows specification of a single media attribute value.
Other Job Template Attributes

Set-Job-Attributes Response

The following groups of attributes are send as part of the Set-Job-Attributes Response:

Group 1: Operation Attributes

Status Message:: The standard response status message.
Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

CUPS 1.2Create-Printer-Subscription

The Create-Printer-Subscription operation (0x0016) creates a subscription for printer or server event notifications. CUPS provides several additional events in addition to the standard events in the IPP notifications specification.

Request

The following groups of attributes are supplied as part of the request:

Group 1: Operation Attributes

Natural Language and Character Set:

The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.1 of the IPP Model and Semantics document.

"printer-uri" (uri):

The printer (ipp://server/printers/printername), class (ipp://server/classes/classname), or server (ipp://server/) URI for event notifications.

"notify-events" (1setOf keyword):

The events to monitor. In addition to the standard events, CUPS adds the following keywords:

printer-added - Get notified whenever a printer or class is added
printer-deleted - Get notified whenever a printer or class is deleted
printer-modified - Get notified whenever a printer or class is modified
server-audit - Get notified when a security condition occurs
server-restarted - Get notified when the server is restarted
server-started - Get notified when the server is started
server-stopped - Get notified when the server is stopped

Response

The following groups of attributes are send as part of the response:

Group 1: Operation Attributes

Status Message:: The standard response status message.
Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

Group 2: Subscription Object Attributes

"subscription-id" (integer):: The subscription number.

CUPS-Get-Default Operation

The CUPS-Get-Default operation (0x4001) returns the default printer URI and attributes.

CUPS-Get-Default Request

The following groups of attributes are supplied as part of the CUPS-Get-Default request:

Group 1: Operation Attributes

Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.1 of the IPP Model and Semantics document.
"requested-attributes" (1setOf keyword) :: The client OPTIONALLY supplies a set of attribute names and/or attribute group names in whose values the requester is interested. If the client omits this attribute, the server responds as if this attribute had been supplied with a value of 'all'.

CUPS-Get-Default Response

The following groups of attributes are send as part of the CUPS-Get-Default Response:

Group 1: Operation Attributes

Status Message:: The standard response status message.
Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

Group 2: Printer Object Attributes

The set of requested attributes and their current values.

CUPS-Get-Printers Operation

The CUPS-Get-Printers operation (0x4002) returns the printer attributes for every printer known to the system. This may include printers that are not served directly by the server.

CUPS-Get-Printers Request

The following groups of attributes are supplied as part of the CUPS-Get-Printers request:

Group 1: Operation Attributes

Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.1 of the IPP Model and Semantics document.
"limit" (integer (1:MAX)):: The client OPTIONALLY supplies this attribute limiting the number of printers that are returned.
"printer-info" (text(127)):CUPS 1.1: The client OPTIONALLY supplies this attribute to select which printers are returned.
"printer-location" (text(127)): CUPS 1.1.7: The client OPTIONALLY supplies this attribute to select which printers are returned.
"printer-type" (type2 enum): CUPS 1.1.7: The client OPTIONALLY supplies a printer type enumeration to select which printers are returned.
"printer-type-mask" (type2 enum): CUPS 1.1.7: The client OPTIONALLY supplies a printer type mask enumeration to select which bits are used in the "printer-type" attribute.
"requested-attributes" (1setOf keyword) :: The client OPTIONALLY supplies a set of attribute names and/or attribute group names in whose values the requester is interested. If the client omits this attribute, the server responds as if this attribute had been supplied with a value of 'all'.

CUPS-Get-Printers Response

The following groups of attributes are send as part of the CUPS-Get-Printers Response:

Group 1: Operation Attributes

Status Message:: The standard response status message.
Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

Group 2: Printer Object Attributes

The set of requested attributes and their current values for each printer.

CUPS-Add-Modify-Printer Operation

The CUPS-Add-Modify-Printer operation (0x4003) adds a new printer or modifies an existing printer on the system.

CUPS-Add-Modify-Printer Request

The following groups of attributes are supplied as part of the CUPS-Add-Modify-Printer request:

Group 1: Operation Attributes

Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.1 of the IPP Model and Semantics document.
"printer-uri" (uri):: The client MUST supply a URI for the specified printer.

Group 2: Printer Object Attributes

"job-sheets-default" (1setOf name(127)): CUPS 1.1.7: The client OPTIONALLY supplies one or two banner page names that are printed before and after files in a job. The reserved name "none" is used to specify that no banner page should be printed.
"device-uri" (uri):: The client OPTIONALLY supplies a device URI for the specified printer.
"ppd-name" (name(127)):: The client OPTIONALLY supplies a PPD name for the specified printer.
"printer-is-accepting-jobs" (boolean):: The client OPTIONALLY supplies this boolean attribute indicating whether or not the printer object should accept new jobs.
"printer-info" (text(127)):: The client OPTIONALLY supplies this attribute indicating the printer information string.
"printer-location" (text(127)):: The client OPTIONALLY supplies this attribute indicating a textual location of the printer.
"printer-more-info" (uri):: The client OPTIONALLY supplies this attribute indicating a URI for additional printer information.
"printer-state" (type2 enum):: The client OPTIONALLY supplies this attribute indicating the initial/current state of the printer. Only the "idle" and "stopped" enumerations are recognized.
"printer-state-message" (text(MAX)):: The client OPTIONALLY supplies this attribute indicating a textual reason for the current printer state.
"requesting-user-name-allowed" (1setof name(127) | delete) OR "requesting-user-name-denied" (1setof name(127) | delete):: The client OPTIONALLY supplies one of these attributes to specify an access control list for incoming print jobs. To allow all users access to a printer, use the delete tag for the attribute value.

The CUPS-Add-Modify-Printer request can optionally be followed by a PPD file or System V interface script to be used for the printer. The "ppd-name" attribute overrides any file that is attached to the end of the request with a local CUPS PPD file.

CUPS-Add-Modify-Printer Response

The following groups of attributes are send as part of the CUPS-Add-Modify-Printer Response:

Group 1: Operation Attributes

Status Message:: The standard response status message.
Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

CUPS-Delete-Printer Operation

The CUPS-Delete-Printer operation (0x4004) removes an existing printer from the system.

CUPS-Delete-Printer Request

The following groups of attributes are supplied as part of the CUPS-Delete-Printer request:

Group 1: Operation Attributes

Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.1 of the IPP Model and Semantics document.
"printer-uri" (uri):: The client MUST supply a URI for the specified printer.

CUPS-Delete-Printer Response

The following groups of attributes are send as part of the CUPS-Delete-Printer Response:

Group 1: Operation Attributes

Status Message:: The standard response status message.
Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

CUPS-Get-Classes Operation

The CUPS-Get-Classes operation (0x4005) returns the printer attributes for every printer class known to the system. This may include printer classes that are not served directly by the server.

CUPS-Get-Classes Request

The following groups of attributes are supplied as part of the CUPS-Get-Classes request:

Group 1: Operation Attributes

Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.1 of the IPP Model and Semantics document.
"limit" (integer (1:MAX)):: The client OPTIONALLY supplies this attribute limiting the number of printer classes that are returned.
"printer-info" (text(127)): CUPS 1.1.7: The client OPTIONALLY supplies this attribute to select which printer classes are returned.
"printer-location" (text(127)): CUPS 1.1.7: The client OPTIONALLY supplies this attribute to select which printer classes are returned.
"printer-type" (type2 enum): CUPS 1.1.7: The client OPTIONALLY supplies a printer type enumeration to select which printer classes are returned.
"printer-type-mask" (type2 enum): CUPS 1.1.7: The client OPTIONALLY supplies a printer type mask enumeration to select which bits are used in the "printer-type" attribute.
"requested-attributes" (1setOf keyword) :: The client OPTIONALLY supplies a set of attribute names and/or attribute group names in whose values the requester is interested. If the client omits this attribute, the server responds as if this attribute had been supplied with a value of 'all'.

CUPS-Get-Classes Response

The following groups of attributes are send as part of the CUPS-Get-Classes Response:

Group 1: Operation Attributes

Status Message:: The standard response status message.
Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

Group 2: Printer Class Object Attributes

The set of requested attributes and their current values for each printer class.

CUPS-Add-Modify-Class Operation

The CUPS-Add-Modify-Class operation (0x4006) adds a new printer class or modifies and existing printer class on the system.

CUPS-Add-Modify-Class Request

The following groups of attributes are supplied as part of the CUPS-Add-Modify-Class request:

Group 1: Operation Attributes

Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.1 of the IPP Model and Semantics document.
"printer-uri" (uri):: The client MUST supply a URI for the specified printer class.

Group 2: Printer Object Attributes

"member-uris" (1setof uri):: The client OPTIONALLY supplies the "member-uris" set specifying the printers and printer classes that are part of the class.
"printer-is-accepting-jobs" (boolean):: The client OPTIONALLY supplies this boolean attribute indicating whether or not the class object should accept new jobs.
"printer-info" (text(127)):: The client OPTIONALLY supplies this attribute indicating the printer information string.
"printer-location" (text(127)):: The client OPTIONALLY supplies this attribute indicating a textual location of the class.
"printer-more-info" (uri):: The client OPTIONALLY supplies this attribute indicating a URI for additional class information.
"printer-state" (type2 enum):: The client OPTIONALLY supplies this attribute indicating the initial/current state of the class. Only the "idle" and "stopped" enumerations are recognized.
"printer-state-message" (text(MAX)):: The client OPTIONALLY supplies this attribute indicating a textual reason for the current class state.
"requesting-user-name-allowed" (1setof name(127)) OR "requesting-user-name-denied" (1setof name(127)):: The client OPTIONALLY supplies one of these attributes to specify an access control list for incoming print jobs. To allow all users access to a class, use the delete tag for the attribute value.

CUPS-Add-Modify-Class Response

The following groups of attributes are send as part of the CUPS-Add-Modify-Class Response:

Group 1: Operation Attributes

Status Message:: The standard response status message.
Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

CUPS-Delete-Class Operation

The CUPS-Delete-Class operation (0x4007) removes an existing printer class from the system.

CUPS-Delete-Class Request

The following groups of attributes are supplied as part of the CUPS-Delete-Class request:

Group 1: Operation Attributes

Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.1 of the IPP Model and Semantics document.
"printer-uri" (uri):: The client MUST supply a URI for the specified printer class.

CUPS-Delete-Class Response

The following groups of attributes are send as part of the CUPS-Delete-Class Response:

Group 1: Operation Attributes

Status Message:: The standard response status message.
Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

CUPS-Accept-Jobs Operation

The CUPS-Accept-Jobs operation (0x4008) sets the "printer-is-accepting-jobs" attribute to true for the specified printer or printer class.

CUPS-Accept-Jobs Request

The following groups of attributes are supplied as part of the CUPS-Accept-Jobs request:

Group 1: Operation Attributes

Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.1 of the IPP Model and Semantics document.
"printer-uri" (uri):: The client MUST supply a URI for the specified printer or printer class.

CUPS-Accept-Jobs Response

The following groups of attributes are send as part of the CUPS-Accept-Jobs Response:

Group 1: Operation Attributes

Status Message:: The standard response status message.
Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

CUPS-Reject-Jobs Operation

The CUPS-Reject-Jobs operation (0x4009) sets the"printer-is-accepting-jobs" attribute to false for the specified printer or printer class.

CUPS-Reject-Jobs Request

The following groups of attributes are supplied as part of the CUPS-Reject-Jobs request:

Group 1: Operation Attributes

Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.1 of the IPP Model and Semantics document.
"printer-uri" (uri):: The client MUST supply a URI for the specified printer or printer class.

Group 2: Printer Object Attributes

"printer-state-message" (text(MAX)):: The client OPTIONALLY supplies this attribute indicating a textual reason for the current printer state.

CUPS-Reject-Jobs Response

The following groups of attributes are send as part of the CUPS-Reject-Jobs Response:

Group 1: Operation Attributes

Status Message:: The standard response status message.
Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

CUPS-Set-Default Operation

The CUPS-Set-Default operation (0x400A) sets the default printer destination for all clients when a resource name of "/printers" is specified.

CUPS-Set-Default Request

The following groups of attributes are supplied as part of the CUPS-Set-Default request:

Group 1: Operation Attributes

Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.1 of the IPP Model and Semantics document.
"printer-uri" (uri):: The client MUST supply a URI for the specified printer or printer class.

CUPS-Set-Default Response

The following groups of attributes are send as part of the CUPS-Set-Default Response:

Group 1: Operation Attributes

Status Message:: The standard response status message.
Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

CUPS 1.1CUPS-Get-Devices Operation

The CUPS-Get-Devices operation (0x400B) returns all of the supported device-uri's for the server.

CUPS-Get-Devices Request

The following groups of attributes are supplied as part of the CUPS-Get-Devices request:

Group 1: Operation Attributes

Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.1 of the IPP Model and Semantics document.
"device-class" (type1 keyword):: The client OPTIONALLY supplies a device class keyword to select which devices are returned.
"limit" (integer (1:MAX)):: The client OPTIONALLY supplies this attribute limiting the number of devices that are returned.
"requested-attributes" (1setOf keyword) :: The client OPTIONALLY supplies a set of attribute names and/or attribute group names in whose values the requester is interested. If the client omits this attribute, the server responds as if this attribute had been supplied with a value of 'all'.

CUPS-Get-Devices Response

The following groups of attributes are send as part of the CUPS-Get-Devices Response:

Group 1: Operation Attributes

Status Message:: The standard response status message.
Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

Group 2: Device Object Attributes

The set of requested attributes and their current values for each device.

CUPS 1.1CUPS-Get-PPDs Operation

The CUPS-Get-PPDs operation (0x400C) returns all of the locally available PPD files on the system.

CUPS-Get-PPDs Request

The following groups of attributes are supplied as part of the CUPS-Get-PPDs request:

Group 1: Operation Attributes

Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.1 of the IPP Model and Semantics document.
"limit" (integer (1:MAX)):: The client OPTIONALLY supplies this attribute limiting the number of PPDs that are returned.
"ppd-make" (text(127)):: The client OPTIONALLY supplies a printer manufacturer to select which PPDs are returned.
"requested-attributes" (1setOf keyword) :: The client OPTIONALLY supplies a set of attribute names and/or attribute group names in whose values the requester is interested. If the client omits this attribute, the server responds as if this attribute had been supplied with a value of 'all'.

CUPS-Get-PPDs Response

The following groups of attributes are send as part of the CUPS-Get-PPDs Response:

Group 1: Operation Attributes

Status Message:: The standard response status message.
Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

Group 2: PPD Attributes

The set of requested attributes and their current values for each PPD file.

CUPS 1.1CUPS-Move-Job Operation

The CUPS-Move-Job operation (0x400D) moves an active print job to a different printer.

CUPS-Move-Job Request

The following groups of attributes are supplied as part of the CUPS-Move-Job request:

Group 1: Operation Attributes

Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.1 of the IPP Model and Semantics document.
"printer-uri" (uri) and "job-id" (integer) OR "job-uri":: The client MUST supply a URI for the specified printer and a job ID number, or the job URI.

Group 2: Job Template Attributes

"job-printer-uri" (uri): The client MUST supply a URI for a printer on the same server.

CUPS-Move-Job Response

The following groups of attributes are send as part of the CUPS-Move-Job Response:

Group 1: Operation Attributes

Status Message:: The standard response status message.
Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

CUPS 1.2CUPS-Authenticate-Job Operation

The CUPS-Authenticate-Job operation (0x400E) authenticate a print job for printing. Typically this is used when printing to a remote server. The authentication information is passed in the HTTP request.

CUPS-Authenticate-Job Request

The following groups of attributes are supplied as part of the CUPS-Authenticate-Job request:

Group 1: Operation Attributes

Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.1 of the IPP Model and Semantics document.
"printer-uri" (uri) and "job-id" (integer) OR "job-uri":: The client MUST supply a URI for the specified printer and a job ID number, or the job URI.

CUPS-Authenticate-Job Response

The following groups of attributes are send as part of the CUPS-Authenticate-Job Response:

Group 1: Operation Attributes

Status Message:: The standard response status message.
Natural Language and Character Set:: The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

Attributes

CUPS provides many extension attributes to support multiple devices, PPD files, standard job filters, printers, and printer classes.

Device Attributes

Device attributes are returned by the CUPS-Get-Devices operation and enumerate all of the available hardware devices and network protocols that are supported by the server.

device-class (type2 keyword)

The device-class attribute specifies the class of device and can be one of the following:

"file" - a disk file.
"direct" - a parallel or fixed-rate serial data port, currently used for Centronics, IEEE-1284, and USB printer ports.
"serial" - a variable-rate serial port.
"network" - a network connection, typically via AppSocket, HTTP, IPP, LPD, or SMB/CIFS protocols.

device-id (text(127))

The device-id attribute specifies the IEEE-1284 device ID string for the device.

device-info (text(127))

The device-info attribute specifies a human-readable string describing the device, e.g. "Parallel Port #1".

device-make-and-model (text(127))

The device-makr-and-model attribute specifies a device identification string provided by the printer connected to the device. If the device or printer does not support identification then this attribute contains the string "unknown".

device-uri (uri)

The device-uri attribute specifies a unique identifier for the device. The actual format of the device-uri string depends on the value of the device-class attribute:

"file" - The device-uri will be of the form "file:///path/to/filename".
"direct" - The device-uri will be of the form "scheme:/dev/filename" or "scheme://vendor/identifier", where scheme may be "parallel" or "usb" in the current implementation.
"serial" - The device-uri will be of the form "serial:/dev/filename?baud=value+parity=value+flow=value". The baud value is the data rate in bits per second; the supported values depend on the underlying hardware. The parity value can be one of "none", "even", or "odd". The flow value can be one of "none", "soft" (XON/XOFF handshaking), "hard" or "rts/cts" (RTS/CTS handshaking), or "dtrdsr" (DTR/DSR handshaking).
The URI returned by CUPS-Get-Devices will contain the maximum baud rate supported by the device and the best type of flow control available ("soft" or "hard").
"network" - The device-uri will be of the form "scheme://[username:password@]hostname[:port]/[resource]", where scheme may be "http", "https", "ipp", "lpd", "smb", or "socket" in the current implementation.
The URI returned by CUPS-Get-Devices will only contain the scheme name ("scheme"). It is up to the client application to add the appropriate host and other information when adding a new printer.
The URI returned by Get-Printer-Attributes and CUPS-Get-Printers has any username and password information stripped; the information is still stored and used by the server internally to perform any needed authentication.

Job Template Attributes

blackplot (boolean)

The blackplot attribute specifies whether HP-GL/2 plot files should be rendered entirely in black ink (blackplot=true) or using the colors and shades specified in the file (blackplot=false). The default value is false.

brightness (integer(0:200))

The brightness attribute specifies the overall brightness of the printed output in percent. A brightness of 100 is normal, while 200 is twice as bright and 50 is half as bright. The default value is 100.

Brightness is applied to the Cyan, Magenta, Yellow, and Black values using the function "f(x) = brightness / 100 * x".

columns (integer(1:4))

The columns attribute specifies the number of columns to generate when printing text files. The default value is 1.

cpi (type2 enum)

The cpi attribute specifies the number of characters per inch when printing text files. Only the values 10, 12, and 17 are currently supported. The default value is 10.

fitplot (boolean)

The fitplot attribute specifies whether to scale HP-GL/2 plot files to fit on the selected media (fitplot=true) or use the physical scale specified in the plot file (fitplot=false). The default value is false.

gamma (integer(1:10000))

The gamma attribute specifies the luminance correction for the output. A value of 1000 specifies no correction, while values of 2000 and 500 will generate lighter and darker output, respectively. The default value is 1000.

Gamma is applied to the Red, Green, and Blue values (or luminance for grayscale output) using the function "f(x) = x^(1000/gamma)".

hue (integer(-180:180))

The hue attribute specifies a color hue rotation when printing image files. The default value is 0.

job-billing (text(MAX))CUPS 1.1

The job-billing attribute provides a text value to associate with a job for billing purposes.

job-hold-until (keyword | name(MAX))CUPS 1.1

The job-hold-until attribute specifies a hold time. In addition to the standard IPP/1.1 keyword names, CUPS supports name values of the form "HH:MM" and "HH:MM:SS" that specify a hold time. The hold time is in Greenwich Mean Time (GMT) and not in the local time zone. If the specified time is less than the current time, the job is held until the next day.

job-sheets (1setof type3 keyword | name(MAX))CUPS 1.1

The job-sheets attribute specifies one or two banner files that are printed before and after a job. The reserved d Blue va4>