Zabbix Website Checks Windows

Discovery Rules.md

Item: url.statuscode[{#DESCRIPTION}] Trigger: {Template App IIS - Site Checks:url.statuscode[{#DESCRIPTION}].last()}<>{#RESPONSE}

get_iis_status_code.ps1

param(
    [Parameter(Position=0)]
    $Description,
    [Parameter(Position=1)]
    $ConfigFile = "C:\zabbix\scripts\production.iis.checks.json"
)
$Config = Get-Content $ConfigFile | Out-String | ConvertFrom-Json

$Check = $config.data | ?{$_."{#DESCRIPTION}" -eq $Description}

if($Check.count){
    Write-Error $("There are {0} matching entries for this description in {1}" -f $Check.count, $ConfigFile)
    break;
}

# Identify HTTP/HTTPS
$Scheme = "HTTP"
if($Check."{#SCHEME}"){
    $Scheme = $Check."{#SCHEME}"
}

# Force check of this website on the local server, irrespective of the DNS resolution
if($Check.'{#CHECK_LOCALHOST}'){
    $hostname = "localhost";
}else{
    $hostname = $Check.'{#HOST}'
}

# Prep HTTP request
$URL = "{0}://{1}{2}" -f $Scheme, $hostname ,$check.'{#PATH}'
$request = [System.Net.WebRequest]::Create($URL)

# Force check of this website on the local server, irrespective of the DNS resolution
if($Check.'{#CHECK_LOCALHOST}'){
    Write-Verbose $("Using Host header: {0}" -f $Check.'{#HOST}')
    $request.Host = $Check.'{#HOST}'
}

# Bypass Proxy
$request.Proxy = New-Object System.Net.WebProxy

# Ignore SSL errors
[System.Net.ServicePointManager]::ServerCertificateValidationCallback = {$true}

# Don't follow redirects
$request.AllowAutoRedirect  = $false


if($Check."{#USER}"){
    
    Write-Verbose "Using Basic Auth"
    $BasicAuth = "{0}:{1}" -f $Check."{#USER}",$Check."{#PASS}"
    $Bytes = [System.Text.Encoding]::Unicode.GetBytes($BasicAuth)
    $BasicAuthEncoded =[Convert]::ToBase64String($Bytes)
    $request.Headers["Authorization"] = $BasicAuthEncoded
}

Write-Verbose "Fetching $URL"
try {
    $res = $request.GetResponse()
} catch [System.Net.WebException] {
    $res = $_.Exception.Response
    Write-Verbose $_.Exception.Message -ErrorAction SilentlyContinue
}

$StatusCode = [int]$res.StatusCode

if($StatusCode){
   
    if($StatusCode -eq $Check."{#RESPONSE}"){
        Write-Verbose "The check is returning as expected!" 
    }
   $StatusCode

}else{
   "0"
}

iis.checks.json

{
	"data": [
		{
			"{#HOST}": "www.example.com",
			"{#PATH}": "/",
			"{#USER}": "username",
			"{#PASS}": "P@ssW0rd!",
			"{#DESCRIPTION}": "Checking Example.com logs in!",
			"{#RESPONSE}": "200",
			"{#CHECK_LOCALHOST}": true
		}
  ]
}

UserParameter.cfg

UserParameter=generic.discoverfile[*], powershell -NoProfile -Command "&{try{cat C:\zabbix\scripts\$1 -erroraction stop}catch{'{"""data""":[]}'}}"
UserParameter=url.statuscode[*],powershell -NoProfile -ExecutionPolicy Bypass -File "C:\zabbix\scripts\get_iis_site_status_code.ps1" "$1"