helpers/snmp/WhatsUpGoldPS.Snmp/Public/Invoke-SNMPBulkWalkFriendly.ps1

function Invoke-SNMPBulkWalkFriendly {
    <#
    .SYNOPSIS
        Friendly wrapper for SNMP bulk walk with SNMPv2c and SNMPv3 support.
     
    .DESCRIPTION
        Performs SNMP bulk walks with user-friendly parameter names for authentication
        and privacy protocols. Supports SNMPv1, SNMPv2c, and SNMPv3.
     
    .PARAMETER Target
        IP address or hostname of the SNMP target device.
     
    .PARAMETER Table
        Base OID to walk (e.g., '1.3.6.1.2.1.1' for SNMPv2-MIB::system).
     
    .PARAMETER Community
        SNMP community string for SNMPv1/v2c. Default: 'public'.
     
    .PARAMETER Version
        SNMP version: 'V1', 'V2', or 'V3'. Default: 'V2'.
     
    .PARAMETER Port
        SNMP port. Default: 161.
     
    .PARAMETER Timeout
        SNMP timeout in milliseconds. Default: 5000 (5 seconds).
        Kept tight to avoid long hangs on unresponsive or slow devices.
     
    .PARAMETER MaxRetries
        Maximum number of retry attempts on timeout. Default: 1.
        SNMPv3 crypto handshakes are expensive -- fewer retries avoids
        piling up on slow devices like old Cisco Call Managers.
     
    .PARAMETER MaxRepetitions
        Maximum number of variables per SNMP message. Default: 10.
     
    .PARAMETER NoCache
        Bypass the SNMPv3 engine discovery cache and force a fresh handshake.
     
    .PARAMETER Username
        SNMPv3 username (security name). Required for SNMPv3.
     
    .PARAMETER AuthProtocol
        SNMPv3 authentication protocol. Valid values:
        'None', 'MD5', 'SHA', 'SHA256', 'SHA384', 'SHA512'. Default: 'SHA256'.
     
    .PARAMETER AuthPassword
        SNMPv3 authentication password (plain text or SecureString).
     
    .PARAMETER PrivProtocol
        SNMPv3 privacy protocol. Valid values:
        'None', 'DES', '3DES', 'AES', 'AES192', 'AES256'. Default: 'AES256'.
     
    .PARAMETER PrivPassword
        SNMPv3 privacy password (plain text or SecureString).
     
    .EXAMPLE
        Invoke-SNMPBulkWalkFriendly -Target '192.168.1.1' -Table '1.3.6.1.2.1.1'
     
    .EXAMPLE
        Invoke-SNMPBulkWalkFriendly -Target '192.168.1.1' -Table '1.3.6.1.2.1.1' -Version 'V3' -Username 'snmpuser' -AuthProtocol 'SHA256' -AuthPassword 'authpass' -PrivProtocol 'AES256' -PrivPassword 'privpass'
    #>

    [CmdletBinding()]
    param(
        [Parameter(Mandatory)]
        [string]$Target,

        [Parameter(Mandatory)]
        [string]$Table,

        [string]$Community = 'public',

        [ValidateSet('V1', 'V2', 'V3')]
        [string]$Version = 'V2',

        [int]$Port = 161,
        [int]$Timeout = 5000,
        [int]$MaxRetries = 1,
        [int]$MaxRepetitions = 10,
        [switch]$NoCache,

        [string]$Username,

        [ValidateSet('None', 'NoAuth', 'MD5', 'SHA', 'SHA1', 'SHA96', 'SHA256', 'SHA224', 'SHA2', 'SHA384', 'SHA512')]
        [string]$AuthProtocol = 'SHA256',

        [object]$AuthPassword,

        [ValidateSet('None', 'NoPriv', 'DES', '3DES', 'TripleDES', 'AES', 'AES128', 'AES192', 'AES256')]
        [string]$PrivProtocol = 'AES256',

        [object]$PrivPassword
    )

    if (-not ('Lextm.SharpSnmpLib.Messaging.Messenger' -as [type])) {
        throw 'SharpSnmpLib is not loaded. Run Import-SharpSnmpLib first.'
    }

    # Call the underlying Invoke-SNMPBulkWalk with appropriate parameters
    if ($Version -eq 'V3') {
        # Convert passwords if needed
        $authPasswordStr = if ($AuthPassword -is [System.Security.SecureString]) {
            $bstr = [System.Runtime.InteropServices.Marshal]::SecureStringToBSTR($AuthPassword)
            try { [System.Runtime.InteropServices.Marshal]::PtrToStringAuto($bstr) }
            finally { [System.Runtime.InteropServices.Marshal]::ZeroFreeBSTR($bstr) }
        } else { [string]$AuthPassword }

        $privPasswordStr = if ($PrivPassword -is [System.Security.SecureString]) {
            $bstr = [System.Runtime.InteropServices.Marshal]::SecureStringToBSTR($PrivPassword)
            try { [System.Runtime.InteropServices.Marshal]::PtrToStringAuto($bstr) }
            finally { [System.Runtime.InteropServices.Marshal]::ZeroFreeBSTR($bstr) }
        } else { [string]$PrivPassword }

        # Get auth and priv providers
        $authProvider = ConvertTo-SNMPv3AuthProtocol -Protocol $AuthProtocol -Password $authPasswordStr
        $privProvider = ConvertTo-SNMPv3PrivProtocol -Protocol $PrivProtocol -Password $privPasswordStr -AuthenticationProvider $authProvider

        # SNMPv3 requires a discovery handshake to get engine ID/time before bulk operations
        # Use cached discovery when available to avoid hammering slow devices
        if ($NoCache) {
            $discovery = [Lextm.SharpSnmpLib.Messaging.Messenger]::GetNextDiscovery([Lextm.SharpSnmpLib.SnmpType]::GetRequestPdu)
            $endpoint = New-Object System.Net.IPEndPoint ([System.Net.IPAddress]::Parse($Target)), $Port
            $reportMsg = $discovery.GetResponse($Timeout, $endpoint)
        } else {
            $reportMsg = Get-SNMPv3CachedDiscovery -Target $Target -Port $Port -Timeout $Timeout
        }

        # Retry loop -- SNMPv3 crypto overhead makes retries expensive on slow hardware
        $lastError = $null
        for ($attempt = 0; $attempt -le $MaxRetries; $attempt++) {
            if ($attempt -gt 0) {
                Write-Verbose "SNMPv3 BulkWalk retry $attempt of $MaxRetries for $Target"
                # On retry, force a fresh discovery in case engine time drifted
                Clear-SNMPv3EngineCache -Target $Target -Port $Port
                $reportMsg = Get-SNMPv3CachedDiscovery -Target $Target -Port $Port -Timeout $Timeout
            }
            try {
                $result = Invoke-SNMPBulkWalk -Target $Target -Table $Table -Version $Version `
                    -Community $Username -ContextName '' -Port $Port -Timeout $Timeout `
                    -MaxRepetitions $MaxRepetitions -WalkMode 'WithinSubtree' `
                    -Privacy $privProvider -Report $reportMsg
                return $result
            }
            catch {
                $lastError = $_
                Write-Warning "SNMPv3 BulkWalk attempt $($attempt + 1) failed for ${Target}: $($_.Exception.Message)"
                # Invalidate cache on error so next attempt re-discovers
                Clear-SNMPv3EngineCache -Target $Target -Port $Port
            }
        }
        throw $lastError
    } else {
        # SNMPv1/v2c
        return Invoke-SNMPBulkWalk -Target $Target -Table $Table -Version $Version `
            -Community $Community -ContextName '' -Port $Port -Timeout $Timeout `
            -MaxRepetitions $MaxRepetitions -WalkMode 'WithinSubtree'
    }
}

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