Created
September 28, 2014 03:17
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A simple PowerShell implementation of the most basic functionality of Netcat
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function Send-NetworkData { | |
[CmdletBinding()] | |
param ( | |
[Parameter(Mandatory)] | |
[string] | |
$Computer, | |
[Parameter(Mandatory)] | |
[ValidateRange(1, 65535)] | |
[Int16] | |
$Port, | |
[Parameter(ValueFromPipeline)] | |
[string[]] | |
$Data, | |
[System.Text.Encoding] | |
$Encoding = [System.Text.Encoding]::ASCII, | |
[TimeSpan] | |
$Timeout = [System.Threading.Timeout]::InfiniteTimeSpan | |
) | |
begin { | |
# establish the connection and a stream writer | |
$Client = New-Object -TypeName System.Net.Sockets.TcpClient | |
$Client.Connect($Computer, $Port) | |
$Stream = $Client.GetStream() | |
$Writer = New-Object -Type System.IO.StreamWriter -ArgumentList $Stream, $Encoding, $Client.SendBufferSize, $true | |
} | |
process { | |
# send all the input data | |
foreach ($Line in $Data) { | |
$Writer.WriteLine($Line) | |
} | |
} | |
end { | |
# flush and close the connection send | |
$Writer.Flush() | |
$Writer.Dispose() | |
$Client.Client.Shutdown('Send') | |
# read the response | |
$Stream.ReadTimeout = [System.Threading.Timeout]::Infinite | |
if ($Timeout -ne [System.Threading.Timeout]::InfiniteTimeSpan) { | |
$Stream.ReadTimeout = $Timeout.TotalMilliseconds | |
} | |
$Result = '' | |
$Buffer = New-Object -TypeName System.Byte[] -ArgumentList $Client.ReceiveBufferSize | |
do { | |
try { | |
$ByteCount = $Stream.Read($Buffer, 0, $Buffer.Length) | |
} catch [System.IO.IOException] { | |
$ByteCount = 0 | |
} | |
if ($ByteCount -gt 0) { | |
$Result += $Encoding.GetString($Buffer, 0, $ByteCount) | |
} | |
} while ($Stream.DataAvailable -or $Client.Client.Connected) | |
Write-Output $Result | |
# cleanup | |
$Stream.Dispose() | |
$Client.Dispose() | |
} | |
} | |
# pipe in a HTTP request: | |
'GET / HTTP/1.0', '' | Send-NetworkData -Computer www.powershellmagazine.com -Port 80 | |
# Use the Data parameter to do the same: | |
Send-NetworkData -Data 'GET / HTTP/1.0', '' -Computer www.powershellmagazine.com -Port 80 | |
# As before but only wait 2 seconds for a response: | |
Send-NetworkData -Data 'GET / HTTP/1.0', '' -Computer www.powershellmagazine.com -Port 80 -Timeout 0:00:02 | |
# Say hello to an SMTP server: | |
Send-NetworkData -Data "EHLO $Env:ComputerName", "QUIT" -Computer mail.example.com -Port 25 |
} while ($Stream.DataAvailable -or $Client.Client.Connected)
} while ($Stream.DataAvailable -and $Client.Client.Connected)
A complete Bash Netcat replacement,
echo -ne "ehlo foo@bar.test\r\nmail from:<foo@bar.test>\r\nrcpt to:<baz@bar.test>\r\ndata\r\nSubject: test\r\n\r\nHello, world\r\n.\r\nquit\r\n" | { mapfile -t lines; lines=("${lines[@]//$'\r'/}"); pslines=("${lines[@]/#/\"}"); pslines=("${pslines[@]/%/\"}"); pslines="${pslines[*]/%/,}"; pslines="${pslines:0: -1}"; powershell -noprofile -command '.\netcat.ps1' -Computer SERVER -Port 25 -Data "${pslines}" -Timeout "0:00:02"; }
Using =$True
in [Parameter(...=$True)]
makes a similar script compatible with PowerShell 2.
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[Int16]::MaxValue is 32767 - [uint16] would probably be more appropriate for $Port