WhatsUpGoldPS

0.1.22

helpers/bgp/Get-BgpPeerInventory.ps1

                                #requires -Version 5.1

$script:BgpScriptDir = Split-Path $MyInvocation.MyCommand.Path -Parent

function Get-BgpOidMap {

    [ordered]@{

        PeerTable          = '1.3.6.1.2.1.15.3.1'

        Identifier         = '1'

        State              = '2'

        AdminStatus        = '3'

        NegotiatedVersion  = '4'

        LocalAddress       = '5'

        LocalPort          = '6'

        RemotePort         = '7'

        RemoteAs           = '8'

        FsmEstablishedTime = '16'

        InUpdates          = '9'

        OutUpdates         = '10'

        InTotalMessages    = '17'

        OutTotalMessages   = '18'

    }

}

function ConvertFrom-BgpTable {

    [CmdletBinding()]

    param(

        [Parameter(Mandatory = $true)] [object[]]$Rows,

        [Parameter(Mandatory = $true)] [hashtable]$OidMap

    )

    $columns = @{}

    foreach ($name in @('Identifier','State','AdminStatus','NegotiatedVersion','LocalAddress','LocalPort','RemotePort','RemoteAs','FsmEstablishedTime','InUpdates','OutUpdates','InTotalMessages','OutTotalMessages')) {

        $columns[$name] = "$($OidMap.PeerTable).$($OidMap[$name])"

    }

    $byIndex = @{}

    foreach ($item in @($Rows)) {

        $oid = [string]$item.OID

        foreach ($name in $columns.Keys) {

            $prefix = "$($columns[$name])."

            if ($oid.StartsWith($prefix, [System.StringComparison]::Ordinal)) {

                $index = $oid.Substring($prefix.Length)

                if (-not $byIndex.ContainsKey($index)) { $byIndex[$index] = @{} }

                $byIndex[$index][$name] = [string]$item.Value

                break

            }

        }

    }

    $inventory = [System.Collections.Generic.List[object]]::new()

    foreach ($index in @($byIndex.Keys)) {

        $row = $byIndex[$index]

        $stateNumber = 0

        $remoteAs = 0

        $established = 0

        [void][int]::TryParse([string]$row.State, [ref]$stateNumber)

        [void][int]::TryParse([string]$row.RemoteAs, [ref]$remoteAs)

        [void][int]::TryParse([string]$row.FsmEstablishedTime, [ref]$established)

        $state = switch ($stateNumber) { 6 { 'Established' } 1 { 'Idle' } 2 { 'Connect' } 3 { 'Active' } 4 { 'OpenSent' } 5 { 'OpenConfirm' } default { 'Unknown' } }

        $inventory.Add([pscustomobject][ordered]@{

            Source = 'SNMP'; RecordType = 'Peer'; Index = $index; PeerAddress = $index

            Identifier = $row.Identifier; RemoteAs = $remoteAs; LocalAddress = $row.LocalAddress

            LocalPort = $row.LocalPort; RemotePort = $row.RemotePort; NegotiatedVersion = $row.NegotiatedVersion

            State = $state; StateCode = $stateNumber; EstablishedSeconds = $established

            InUpdates = $row.InUpdates; OutUpdates = $row.OutUpdates

            InTotalMessages = $row.InTotalMessages; OutTotalMessages = $row.OutTotalMessages

            Status = if ($state -eq 'Established') { 'Healthy' } else { 'Critical' }

        })

    }

    return @($inventory)

}

function Get-BgpPeerInventory {

    [CmdletBinding()]

    param(

        [Parameter(Mandatory = $true)] [string]$Target,

        [string]$Community = 'public',

        [ValidateSet('V1', 'V2')] [string]$SnmpVersion = 'V2',

        [int]$Port = 161,

        [int]$Timeout = 5000,

        [int]$MaxRepetitions = 25,

        [hashtable]$OidMap = $(Get-BgpOidMap)

    )

    $snmpRoot = Join-Path (Split-Path $script:BgpScriptDir -Parent) 'snmp\WhatsUpGoldPS.Snmp\Public'

    . (Join-Path $snmpRoot 'Import-SharpSnmpLib.ps1')

    . (Join-Path $snmpRoot 'Get-SNMPTableSharp.ps1')

    Import-SharpSnmpLib -ErrorAction Stop | Out-Null

    $raw = @(Get-SNMPTableSharp -Target $Target -BaseOid $OidMap.PeerTable -Community $Community -SnmpVersion $SnmpVersion -Port $Port -Timeout $Timeout -MaxRepetitions $MaxRepetitions)

    return @(ConvertFrom-BgpTable -Rows $raw -OidMap $OidMap)

}

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