Function Get-HostsFile {
.SYNOPSIS
Retrieves the contents of a hosts file on a specified system.
.DESCRIPTION
Retrieves the contents of a hosts file on a specified system.
.PARAMETER ComputerName
The computers to access.
.NOTES
Name: Get-HostsFile
Author: Boe Prox
DateCreated: 15Mar2011
1.1 - 2011-03-17 - Jason Archer
Improved pipeline support (and fixed positional usage).
Added custom object creation and incremental output (better performance and cleaner code).
For local host, use local path.
Added error messages for error conditions.
1.0 - 2011-03-15 - Boe Prox
Initial release.
.LINK
http://boeprox.wordpress.com
.EXAMPLE
Get-HostsFile "server1"
Description
-----------
Retrieves the contents of the hosts file on 'server1'.
#>
[CmdletBinding()]
Param(
[Parameter(Position = 0, ValueFromPipeline = $True, ValueFromPipelineByPropertyName = $True)]
[ValidateNotNull()]
[string[]]$ComputerName = "localhost"
)
Begin {
$PSBoundParameters.GetEnumerator() | Foreach-Object {
Write-Verbose "Parameter: $_"
}
}
Process {
Write-Verbose "Starting process of computers"
ForEach ($c in $ComputerName ) {
Write-Verbose "Testing connection of $c"
If (Test-Connection -ComputerName $c -Quiet -Count 1) {
Write-Verbose "Validating path to hosts file"
if ($c -eq "localhost") {
$root = "C:"
} else {
$root = "\\$c\C`$"
}
If (Test-Path "$root\Windows\system32\drivers\etc\hosts") {
Switch -regex -file ("$root\Windows\system32\drivers\etc\hosts") {
"^#\w+" {
}
"^\d\w+" {
Write-Verbose "Adding IPV4 information to collection"
$new = $_.Split("") | Where-Object {$_ -ne ""}
If ($new[2] -eq $null) {
$notes = $null
} Else {
$notes = $new[2]
}
New-Object PSObject -Property @{
ComputerName = $c
IPV4 = $new[0]
IPV6 = $null
Hostname = $new[1]
Notes = $notes
}
}
Default {
If (!("\s+" -match $_ -OR $_.StartsWith("#"))) {
Write-Verbose "Adding IPV6 information to collection"
$new = $_.Split("") | ? {$_ -ne ""}
If ($new[2] -eq $null) {
$notes = $null
} Else {
$notes = $new[2]
}
New-Object PSObject -Property @{
ComputerName = $c
IPV4 = $null
IPV6 = $new[0]
Hostname = $new[1]
Notes = $notes
}
}
}
}
} ElseIf (Test-Path "$root\WinNT\system32\drivers\etc\hosts") {
Switch -regex -file ("$root\WinNT\system32\drivers\etc\hosts") {
"^#\w+" {
}
"^\d\w+" {
Write-Verbose "Adding IPV4 information to collection"
$new = $_.Split("") | ? {$_ -ne ""}
If ($new[2] -eq $null) {
$notes = $null
} Else {
$notes = $new[2]
}
New-Object PSObject -Property @{
ComputerName = $c
IPV4 = $new[0]
IPV6 = $null
Hostname = $new[1]
Notes = $notes
}
}
Default {
If (!("\s+" -match $_ -OR $_.StartsWith("#"))) {
Write-Verbose "Adding IPV6 information to collection"
$new = $_.Split("") | ? {$_ -ne ""}
If ($new[2] -eq $null) {
$notes = $null
} Else {
$notes = $new[2]
}
New-Object PSObject -Property @{
ComputerName = $c
IPV4 = $null
IPV6 = $new[0]
Hostname = $new[1]
Notes = $notes
}
}
}
}
} Else {
## TODO: Could use the properly localized path not found error
Write-Error "Unable to locate host file on computer: $c"
}
} Else {
## TODO: Could use the properly localized can not locate host error
Write-Error "Unable to locate computer: $c"
}
}
}
}
