File size: 6,352 Bytes
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// Licensed under the MIT License.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Management;
using System.Management.Automation;
using System.Text;
using System.Threading;
namespace Microsoft.PowerShell.Commands
{
/// <summary>
/// Registers for an event on an object.
/// </summary>
[Cmdlet(VerbsLifecycle.Register, "WmiEvent", DefaultParameterSetName = "class",
HelpUri = "https://go.microsoft.com/fwlink/?LinkID=135245", RemotingCapability = RemotingCapability.OwnedByCommand)]
public class RegisterWmiEventCommand : ObjectEventRegistrationBase
{
#region parameters
/// <summary>
/// The WMI namespace to use.
/// </summary>
[Parameter]
[Alias("NS")]
public string Namespace { get; set; } = "root\\cimv2";
/// <summary>
/// The credential to use.
/// </summary>
[Parameter]
[Credential]
public PSCredential Credential { get; set; }
/// <summary>
/// The ComputerName in which to query.
/// </summary>
[Parameter]
[Alias("Cn")]
[ValidateNotNullOrEmpty]
public string ComputerName { get; set; } = "localhost";
/// <summary>
/// The WMI class to use.
/// </summary>
[Parameter(Position = 0, Mandatory = true, ParameterSetName = "class")]
public string Class { get; set; } = null;
/// <summary>
/// The query string to search for objects.
/// </summary>
[Parameter(Position = 0, Mandatory = true, ParameterSetName = "query")]
public string Query { get; set; } = null;
/// <summary>
/// Timeout in milliseconds.
/// </summary>
[Parameter]
[Alias("TimeoutMSec")]
public Int64 Timeout
{
get
{
return _timeOut;
}
set
{
_timeOut = value;
_timeoutSpecified = true;
}
}
private Int64 _timeOut = 0;
private bool _timeoutSpecified = false;
#endregion parameters
#region helper functions
private string BuildEventQuery(string objectName)
{
StringBuilder returnValue = new StringBuilder("select * from ");
returnValue.Append(objectName);
return returnValue.ToString();
}
private string GetScopeString(string computer, string namespaceParameter)
{
StringBuilder returnValue = new StringBuilder("\\\\");
returnValue.Append(computer);
returnValue.Append('\\');
returnValue.Append(namespaceParameter);
return returnValue.ToString();
}
#endregion helper functions
/// <summary>
/// Returns the object that generates events to be monitored.
/// </summary>
protected override object GetSourceObject()
{
string wmiQuery = this.Query;
if (this.Class != null)
{
// Validate class format
for (int i = 0; i < this.Class.Length; i++)
{
if (char.IsLetterOrDigit(this.Class[i]) || this.Class[i].Equals('_'))
{
continue;
}
ErrorRecord errorRecord = new ErrorRecord(
new ArgumentException(
string.Format(
Thread.CurrentThread.CurrentCulture,
"Class", this.Class)),
"INVALID_QUERY_IDENTIFIER",
ErrorCategory.InvalidArgument,
null);
errorRecord.ErrorDetails = new ErrorDetails(this, "WmiResources", "WmiInvalidClass");
ThrowTerminatingError(errorRecord);
return null;
}
wmiQuery = BuildEventQuery(this.Class);
}
ConnectionOptions conOptions = new ConnectionOptions();
if (this.Credential != null)
{
System.Net.NetworkCredential cred = this.Credential.GetNetworkCredential();
if (string.IsNullOrEmpty(cred.Domain))
{
conOptions.Username = cred.UserName;
}
else
{
conOptions.Username = cred.Domain + "\\" + cred.UserName;
}
conOptions.Password = cred.Password;
}
ManagementScope scope = new ManagementScope(GetScopeString(ComputerName, this.Namespace), conOptions);
EventWatcherOptions evtOptions = new EventWatcherOptions();
if (_timeoutSpecified)
{
evtOptions.Timeout = new TimeSpan(_timeOut * 10000);
}
ManagementEventWatcher watcher = new ManagementEventWatcher(scope, new EventQuery(wmiQuery), evtOptions);
return watcher;
}
/// <summary>
/// Returns the event name to be monitored on the input object.
/// </summary>
protected override string GetSourceObjectEventName()
{
return "EventArrived";
}
/// <summary>
/// Processes the event subscriber after the base class has registered.
/// </summary>
protected override void EndProcessing()
{
base.EndProcessing();
// Register for the "Unsubscribed" event so that we can stop the
// event watcher.
PSEventSubscriber newSubscriber = NewSubscriber;
if (newSubscriber != null)
{
newSubscriber.Unsubscribed += new PSEventUnsubscribedEventHandler(newSubscriber_Unsubscribed);
}
}
private void newSubscriber_Unsubscribed(object sender, PSEventUnsubscribedEventArgs e)
{
ManagementEventWatcher watcher = sender as ManagementEventWatcher;
if (watcher != null)
{
watcher.Stop();
}
}
}
}
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