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Powershell script for performing reverse lookups of IP Addresses
$stop = $args.Count
$inputIP = ""
$inputFile = ""
$knownIPFile = ""
$showUsage = 0
$verbose = 0
for ($i = 0; $i -lt $stop; $i++)
{
if ($args[$i] -eq "-f") {
if ( ($i + 1) -eq $stop) {
$showUsage = 1
}
else {
$i++
$inputFile = $args[$i]
}
}
elseif ($args[$i] -eq "-k") {
if ( ($i + 1) -eq $stop) {
$showUsage = 1
}
else {
$i++
$knownIPFile = $args[$i]
}
}
elseif ($args[$i] -eq "-verbose") {
$verbose = 1
}
else {
if ( ($i + 1) -eq $stop) {
$inputIP = $args[$i]
}
else {
$showUsage = 1
}
}
}
if ($stop -eq 0) {
$showUsage = 1
}
if ($showUsage) {
Write-Host "Usage: ip_lookup.ps1 [-multiline] [-k <KNOWN_IP_FILE] -f <FILENAME>"
Write-Host " ip_lookup.ps1 [-multiline] [-k <KNOWN_IP_FILE] <IP_ADDRESS>"
Write-Error "Bad Input"
exit
}
$knownIPs = @{}
function LoadKnownIPs($knownIPList)
{
# File should be IP<TAB>Description
$reader = [System.IO.File]::OpenText($knownIPList)
$line = $reader.ReadLine()
while( $line)
{
$result = $line.Split("`t")
if ($result.Count -le 2) {
$knownIPs[$result[0].Trim()] = $result[1]
}
else {
Write-Output ("-" + $result[0].Trim() + "-")
Write-Output "Error at $line with " + $result.Count
}
$line = $reader.ReadLine()
}
$reader.Close()
}
if ( $knownIPFile -ne "" ) {
LoadKnownIPs($knownIPFile)
}
function LookupIP($ip) {
$result = nslookup $ip 2> $null | select-string -pattern "Name:"
if ( ! $result ) { $result = "" }
$result = $result.ToString()
if ($result.StartsWith("Name:")) {
$result = $result.Split()
$result = $result[$result.Count -1 ]
}
else {
$result = "NOT FOUND"
}
$knownMatch = ""
if ($knownIPs.ContainsKey($ip)) {
$knownMatch = $knownIPs[$ip]
}
if ($verbose) {
Write-Output $ip
Write-Output $result
Write-Output $knownMatch
}
else {
Write-Output "$ip `t $result `t $knownMatch"
}
}
if ( $inputFile -ne "") {
$reader = [System.IO.File]::OpenText($inputFile)
$line = $reader.ReadLine()
while( $line)
{
LookupIP $line.Trim()
$line = $reader.ReadLine()
}
$reader.Close()
}
else {
LookupIP $inputIP
}
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