netapi32/NetConnectionEnum.ps1
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function NetConnectionEnum { <# .SYNOPSIS Lists all connections made to a shared resource on the server or all connections established from a particular computer. Note: this requires admin rights on the remote system. .DESCRIPTION This function will execute the NetConnectionEnum Win32API call to query a given host for open connections. .PARAMETER ComputerName Specifies the hostname to query for connections (also accepts IP addresses). Defaults to 'localhost'. .PARAMETER ShareName Specifies the share name to query connections for. Defaults to 'C$'. .PARAMETER Level Specifies the level of information to query from NetConnectionEnum. Default of 1. Affects the result structure returned. .NOTES Author: Will Schroeder (@harmj0y) License: BSD 3-Clause Required Dependencies: PSReflect, NetApiBufferFree (Function) Optional Dependencies: None (func netapi32 NetConnectionEnum ([Int32]) @( [string], # _In_ LMSTR servername [string], # _In_ LMSTR qualifier [Int32], # _In_ DWORD level [IntPtr].MakeByRefType(), # _Out_ LPBYTE *bufptr [Int32], # _In_ DWORD prefmaxlen [Int32].MakeByRefType(), # _Out_ LPDWORD entriesread [Int32].MakeByRefType(), # _Out_ LPDWORD totalentries [Int32].MakeByRefType() # _Inout_ LPDWORD resume_handle ) -EntryPoint NetConnectionEnum) .LINK https://msdn.microsoft.com/en-us/library/windows/desktop/bb525376(v=vs.85).aspx .EXAMPLE #> [CmdletBinding()] Param( [Parameter(Position = 0, ValueFromPipeline = $True, ValueFromPipelineByPropertyName = $True)] [Alias('HostName', 'dnshostname', 'name')] [ValidateNotNullOrEmpty()] [String[]] $ComputerName = 'localhost', [ValidateNotNullOrEmpty()] [String] $ShareName = 'C$', [ValidateSet(0, 1)] [Int] $Level = 1 ) PROCESS { ForEach ($Computer in $ComputerName) { $PtrInfo = [IntPtr]::Zero $EntriesRead = 0 $TotalRead = 0 $ResumeHandle = 0 $Result = $Netapi32::NetConnectionEnum($Computer, $ShareName, $Level, [ref]$PtrInfo, -1, [ref]$EntriesRead, [ref]$TotalRead, [ref]$ResumeHandle); # locate the offset of the initial intPtr $Offset = $PtrInfo.ToInt64() # work out how much to increment the pointer by finding out the size of the structure $Increment = Switch ($Level) { 0 { $CONNECTION_INFO_0::GetSize() } 1 { $CONNECTION_INFO_1::GetSize() } } # 0 = success if (($Result -eq 0) -and ($Offset -gt 0)) { # parse all the result structures for ($i = 0; ($i -lt $EntriesRead); $i++) { # create a new int ptr at the given offset and cast the pointer as our result structure $NewIntPtr = New-Object System.Intptr -ArgumentList $Offset # grab the appropriate result structure $Info = Switch ($Level) { 0 { $NewIntPtr -as $CONNECTION_INFO_0 } 1 { $NewIntPtr -as $CONNECTION_INFO_1 } } # return all the sections of the structure - have to do it this way for V2 $Object = $Info | Select-Object * $Offset = $NewIntPtr.ToInt64() $Offset += $Increment $Object } # free up the result buffer NetApiBufferFree -Buffer $PtrInfo } else { Write-Verbose "[NetConnectionEnum] Error: $(([ComponentModel.Win32Exception] $Result).Message)" } } } } |