Tag Archives: Powershell

Compare Two Directories with Powershell

Posted on by

We use DFS to keep webfarm nodes’ content in sync and ran across a problem where a directory with thousands of files and folders had one missing file on a replica. Here’s a quick script we used to find out what files were missing:

$dir1 = “\\server1\c$\folder1”
$dir2 = “\\server2\c$\folder1”
$d1 = get-childitem -path $dir1 -recurse
$d2 = get-childitem -path $dir2 -recurse
$results = @(compare-object $d1 $d2)

foreach($result in $results)
{
$result.InputObject
}

 

Directory: \\server1\c$\folder1\subfolder

Mode LastWriteTime Length Name
—- ————- —— —-
-a— 2/16/2012 4:08 PM 162 ~$README.txt

This will output all of the files and directories that exist in only one location.

Read & Write .NET machine key with Powershell

Posted on by

We’re putting together webfarms all the time at OrcsWeb, and one of the cardinal rules with webfarms is that all systems need to have matching settings. To help automate this process, I put together a quick Powershell script that will read/write the machine key to the root machine.config files for all versions of the .NET framework.

machineKeys.ps1

# Machine Key Script
#
# Version 1.0
# 6/5/2012
#
# Jeff Graves
#
param ($readWrite = "read", $allkeys = $true, $version, $validationKey, $decryptionkey, $validation)

function GenKey ([int] $keylen) {
	$buff = new-object "System.Byte[]" $keylen
	$rnd = new-object System.Security.Cryptography.RNGCryptoServiceProvider
	$rnd.GetBytes($buff)
	$result =""
	for($i=0; $i -lt $keylen; $i++)	{
		$result += [System.String]::Format("{0:X2}",$buff[$i])
	}
	$result
}

function SetKey ([string] $version, [string] $validationKey, [string] $decryptionKey, [string] $validation) {
    write-host "Setting machineKey for $version"
    $currentDate = (get-date).tostring("mm_dd_yyyy-hh_mm_s") # month_day_year - hours_mins_seconds

    $machineConfig = $netfx[$version]

    if (Test-Path $machineConfig) {
        $xml = (get-content $machineConfig)
        $xml.Save($machineConfig + "_$currentDate")
        $root = $xml.get_DocumentElement()
        $system_web = $root."system.web"
        if ($system_web.machineKey -eq $nul) { 
        	$machineKey = $xml.CreateElement("machineKey") 
        	$a = $system_web.AppendChild($machineKey)
        }
        $system_web.SelectSingleNode("machineKey").SetAttribute("validationKey","$validationKey")
        $system_web.SelectSingleNode("machineKey").SetAttribute("decryptionKey","$decryptionKey")
        $system_web.SelectSingleNode("machineKey").SetAttribute("validation","$validation")
        $a = $xml.Save($machineConfig)
    }
    else { write-host "$version is not installed on this machine" -fore yellow }
}

function GetKey ([string] $version) { 
    write-host "Getting machineKey for $version"
    $machineConfig = $netfx[$version]

    if (Test-Path $machineConfig) { 
        $machineConfig = $netfx.Get_Item($version)
        $xml = (get-content $machineConfig)
        $root = $xml.get_DocumentElement()
        $system_web = $root."system.web"
        if ($system_web.machineKey -eq $nul) { 
        	write-host "machineKey is null for $version" -fore red
        }
        else {
            write-host "Validation Key: $($system_web.SelectSingleNode("machineKey").GetAttribute("validationKey"))" -fore green
    	    write-host "Decryption Key: $($system_web.SelectSingleNode("machineKey").GetAttribute("decryptionKey"))" -fore green
            write-host "Validation: $($system_web.SelectSingleNode("machineKey").GetAttribute("validation"))" -fore green
        }
    }
    else { write-host "$version is not installed on this machine" -fore yellow }
}

$global:netfx = @{"1.1x86" = "C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\CONFIG\machine.config"; `
           "2.0x86" = "C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG\machine.config"; `
           "4.0x86" = "C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\CONFIG\machine.config"; `
           "2.0x64" = "C:\WINDOWS\Microsoft.NET\Framework64\v2.0.50727\CONFIG\machine.config"; `
           "4.0x64" = "C:\WINDOWS\Microsoft.NET\Framework64\v4.0.30319\CONFIG\machine.config"}
if(!$allkeys)
{
    while(!$version) {
        $input = read-host "Version (1.1x86, 2.0x86, 4.0x86, 2.0x64, 4.0x64)"
        if ($netfx.ContainsKey($input)) { $version = $input }
    }
}

if ($readWrite -eq "read")
{
    if($allkeys) {
        foreach ($key in $netfx.Keys) { GetKey -version $key }
    }
    else {
        GetKey -version $version
    }
}
elseif ($readWrite -eq "write")
{   
    if (!$validationkey) {
    	$validationkey = GenKey -keylen 64
    	write-host "Validation Key: $validationKey" -fore green
    }

    if (!$decryptionkey) {
    	$decryptionKey = GenKey -keylen 24
    	write-host "Decryption Key: $decryptionKey" -fore green
    }

    if (!$validation) {
    	$validation = "SHA1"
    	write-host "Validation: $validation" -fore green
    }

    if($allkeys) {
        foreach ($key in $netfx.Keys) { SetKey -version $key -validationkey $validationkey -decryptionKey $decryptionKey -validation $validation}
    }
    else {
        SetKey -version $version -validationkey $validationkey -decryptionKey $decryptionKey -validation $validation
    }
}