CIM probe
The CIM probe uses WBEM protocols to query a particular CIM server, the CIM Object Manager, for a set of data objects and properties.
For instructions on configuring probe parameters, see Set probe parameters.
The following parameters may be passed to the CIM probe:
| Parameter | Description | Default Value |
|---|---|---|
| source | [Required] The initial host to connect to. | None |
| port | The port to connect to. If empty, the value is determined by the "schema" parameter: http = 5988, https = 5989. | 5988 or 5989 |
| schema | [Required] The schema to use: '"http"' or '"https"'. | http |
| namespace | [Required] The CIM namespace. May be overridden by a query. | None |
| queries | [Required] A semicolon-delimited list of CIM probe queries to process and return results for. | None |
| retries | The number of times to retry a query if it fails due to network connectivity issues. | 2 |
| connection_timeout | The number of milliseconds the probe has to connect to a server. | 5000 |
| socket_timeout | The number of milliseconds the probe has to read data. | 5000 |
The CIM Intermediate Query Language (CimIQL) uses keys, filters, and dot-walking to traverse the CIM schema.
Parameter Expansion
The CIM query language supports standard SNC preprocessed probe parameter expansion. Place variables in queries by encapsulating their names like this:
${foobar}.CIM_RunningOS[0].Name
CIM_ComputerSystem.${barfoo}The text ${foobar} is replaced with the contents of the foobarprobe parameter passed to the CIM probe; likewise for barfoo.
CIMIQL
The CIM Intermediate Query Language (CimIQL) is an intermediate language designed to simplify the process of querying CIM providers.
CimIQL currently supports the standard Web-Based Enterprise Management (WBEM) protocol stack, but others, such as Web Services-Management (WS-MAN), may be added in the future. The query language syntax borrows from elements of Microsoft's WMI query language and UNIX's wbemcli command. The CimIQL library is a pure Java implementation.
CimIQL syntax
CimIQL syntax consists of several elements, including a query and different tokens.
| Element | Description |
|---|---|
| Statement | The most basic element of CimIQL is a valid . A statement contains multiple queries delimited by a period . character. |
| Query | A represents a single high-level protocol-independent request. Each query is comprised of nested language components and sub-components known as tokens. |
| Token | A describes a specific lexical aspect of the CimIQL syntax. |
| Operation Token | The first token of each query must be an , which represents the overall logical operation to be performed. |
| Component Token | A is a sub-component of an operation token. |
| Result | Each query is paired with a result, which is then provided as input to the next query in the statement. A is comprised of a set of objects and their properties. |
CimIQL operation tokens
The CimIQL probe requires operation tokens.
Each of the following core operations has a counterpart in the CIM Operations over HTTP standard.
| Return Value | Details | Equivalent CIM Operation over HTTP |
|---|---|---|
| class object | Get
Object
Retrieves a single object of a specific class by specifying all of its unique keys (as key tokens) and any optional parameter tokens, separated by commas. |
GetInstance |
| class object | Enumerate Objects
Retrieves objects that match a set of condition tokens and parameter tokens. |
EnumerateInstances |
| class object | Enumerate Associated Objects
Retrieves objects associated with each result from the preceding query. |
Associators |
| statement results | Substitution
A no-op token that feeds the results of a previous named statement as input into the next query of its own statement. |
Reference the results of a named statement |
Get Object Token
- Retrieves a single object of a specific class by specifying all of its unique keys (as key tokens key tokens) and any optional parameter tokens, separated by commas. This token is also known as the .
- The <classname> is the case-sensitive CIM class name of the desired object. By default, objects of the specified class and of any extended classes are retrieved.
- The key and parameter tokens are enclosed by a single pair of curly brackets { ... }.
- This token must only be used as the first query in a statement.
- Returns: class object
- Example:
CIM_ComputerSystem{CreationClassName='Linux_ComputerSystem',Name='runtime'}.*
Enumerate Objects Token
- Retrieves objects that match a set of condition tokens and parameter tokens. This token is also known as the .
- The condition tokens and parameter tokens are enclosed by two pairs of curly brackets {{ ... }}. The curly brackets are optional if there are no conditions or parameters necessary.
- The <classname> is the case-sensitive CIM class name of the desired objects. By default, objects of the specified class and of any extended classes are retrieved.
- The index token is optional.
- This token must only be used as the first query in a statement.
- Returns: class object
- Example:
CIM_ComputerSystem{{Name!='runtime'}}.*
Enumerate Associated Objects Token
- Retrieves objects associated with each result from the preceding query.
- The condition tokens and parameter tokens are enclosed by two pairs of curly brackets {{ ... }}. The curly brackets are optional if there are no properties filters or parameters necessary.
- The <association classname> is the name of the many-to-many or one-to-many class that associates two objects together. By default, objects of the specified class and of any extended classes are retrieved.
- The <parameter token>, ResultClass, may be specified to filter results based on the resulting object's classname.
- The index token is optional.
- This token must not be used as the first query in a statement.
- Returns: class object
- Example:
CIM_ComputerSystem{{Name='runtime'}}[2].*
Substitution Token
- A no-op token that feeds the results of a previous named statement as input into the next query of its own statement.
- Returns: void
- Example:
$(lastComputer).ElementName
CimIQL component tokens
The CimIQL probe requires component tokens, which are sub-components of operational tokens.
| Token | Details |
|---|---|
| Properties token | * OR <property name>,<property name>,... Specifies which properties are to be returned for each object of the final result set. |
| Query Delimiter Token | . (Period) Separates queries. |
| Index Token | [index] Reduces a preceding query's results to a single object at the specified integer index. |
| Key Token | <key name>='<value>' Matches an object property designated as a key by exact value. |
| Condition Token | <property name><conditional operator><enclosed
value> Matches a single property of an object based on the condition specified. |
| Parameter Token | <parameter name>:'<value>' Passes a parameter by <parameter name> to the operation being called. The parameter may be consumed during CimIQL pre-processing or by the CIMOM via request, depending on the parameter. |
Properties Token
- Specifies which properties are to be returned for each object of the final result set.
- The wildcard * returns all properties available. Otherwise, each property name desired is provided within a comma-separated list.
- This token is required at the end of each statement.
- Example:
CIM_ComputerSystem[0].*
Query Delimiter Token
- Separates queries.
- Example:
CIM_ComputerSystem.PrimaryOwnerContact
Index Token
- Reduces a preceding query's results to a single object at the specified integer index.
- This token is always optional.
- Example:
CIM_ComputerSystem[0].*
Key Token
- Matches an object property designated as a key by exact value.
- The <key name> is the name of the property used as a key.
- Example:
CIM_ComputerSystem{CreationClassName='Linux_ComputerSystem',Name='runtime'}.*
Condition Token
- Matches a single property of an object based on the condition specified.
- The <property name> is the name of the property to match against.
- The <conditional operator> determines how the property's actual value is compared to its expected value. The operators available are equality (=) and inequality (!=).
- The <enclosed value> should be one of the following:
- Literal value enclosed in single-quotes ' ... '. For example, foo='bar'
- Regular expression, enclosed by a pair of slashes / ... /. For example, foo=/bar.*/
- Example:
CIM_ComputerSystem{{Name!='runtime'}}.*
Parameter Token
- Passes a parameter by <parameter name> to the operation being called. The parameter may be consumed during CimIQL pre-processing or by the Common Information Model Object Manager (CIMOM) via request, depending on the parameter.
- Example:
CIM_ComputerSystem.CIM_RunningOS{{ResultClass:'Win32_ComputerSystem'}}.*
CimIQL tutorial
This is a tutorial by example where each example builds on the previous example.
| Order | CimIQL Statement | Result |
|---|---|---|
| 1 | CIM_ComputerSystem[0].* | Retrieves the first result of all instances of CIM_ComputerSystem and its descendants. Retrieves all properties. |
| 2 | CIM_ComputerSystem.PrimaryOwnerContact | Retrieves all instances of CIM_ComputerSystem and their descendants. Retrieves only one property, PrimaryOwnerContact. |
| 3 | CIM_ComputerSystem{CreationClassName='Linux_ComputerSystem',Name='runtime'}.* | Retrieves a single unique instance of CIM_ComputerSystem and its descendants. All key tokens must be specified within the { } identity token. |
| 4 | CIM_ComputerSystem{{Name!='runtime'}}.* | Retrieves all instances and descendants of CIM_ComputerSystem that do not have a Name property of 'runtime'. The filter token {{ }} filters out instances that do not contain all of the properties/keys specified. |
| 5 | CIM_ComputerSystem{{Name=/^run.*$/}}.* | Retrieves all instances and descendants of CIM_ComputerSystem that have a value
matching the regular expression contained within the / / characters.
Note: The
regular expression does not require single quotations. The filter token {{ }} filters out instances that do not contain all of the properties/keys specified. |
| 6 | CIM_ComputerSystem{{Name='runtime'}}[2].* | Retrieves the second result of all instances of CIM_ComputerSystem and its descendants where the instances have a property Name of 'runtime'. The order of operations follows the query syntax.
|
| 7 | CIM_ComputerSystem.CIM_RunningOS[0].Name | Retrieves the Name property for the first CIM_OperatingSystem instance of each CIM_ComputerSystem instance. The middle-token, CIM_RunningOS, is the name of the Associator class, not the end-result. |
| 8 | CIM_ComputerSystem.CIM_RunningOS{{Name=/CentOS/}}[0].Name | Retrieves the Name property for the first CIM_OperatingSystem instance of each CIM_ComputerSystem instance, where each CIM_OperatingSystem instance has a Name property containing 'CentOS'. |
CimIQL results
CIM Probe results are passed to the probe sensor as an XML document embedded within the <output> element.
<!-- document root -->
<cimqueryset>
<!-- A single query and query result. Multiple <cimquery> tags may be provided. -->
<cimquery>
<!-- The original query, enclosed by CDATA. -->
<query><!CDATA[[>CIM_ComputerSystem[0].PrimaryOwnerContact<! ]]></query>
<!-- The resulting data is enclosed within a single <result> tag. -->
<result>
<!-- A single class instance result. Multiple <instance> tags may be provided.
Special tags are prefixed with an underscore character. -->
<instance>
<!-- The instance's CIM classname -->
<_classname>Linux_ComputerSystem</_classname>
<!-- A set of this instances identifying keys. Always provided, regardless of property filters.
Within here, each key is provided as <KeyName>VALUE</KeyName> with the VALUE enclosed as CDATA. -->
<_key>
<CreationClassName><![CDATA[Linux_ComputerSystem]]></CreationClassName>
<Name><![CDATA[runtime]]></Name>
</_key>
<!-- Each property that matches the query's property filter will be provided here, in the same format as keys;
As <PropertyName>VALUE<PropertyName> where VALUE is enclosed as CDATA -->
<PrimaryOwnerContact><![CDATA[root@runtime]]></PrimaryOwnerContact>
</instance>
</result>
</cimquery>
</cimqueryset>