ContainerHandling/updatehosts.ps1
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Param( [string]$hostsFile = "c:\windows\system32\drivers\etc\hosts", [string]$hostname = "localhost", [string]$ipAddress = "127.0.0.1" ) new-item -Path $hostsFile -ItemType File -ErrorAction Ignore | Out-Null $file = $null try { while (!($file)) { try { $file = [System.IO.File]::Open($hostsFile, [System.IO.FileMode]::Open, [System.IO.FileAccess]::ReadWrite, [System.IO.FileShare]::Read) } catch [SYstem.IO.IOException] { Start-Sleep -Seconds 1 } } $content = New-Object System.Byte[] ($file.Length) $file.Read($content, 0, $file.Length) | Out-Null [System.Collections.ArrayList]$hosts = ([System.Text.Encoding]::ASCII.GetString($content)).Replace("`r`n","`n").Split("`n") $hostname = $hostname.ToLowerInvariant() $ln = 0 while ($ln -lt $hosts.Count) { $line = $hosts[$ln] $idx = $line.IndexOf("#") if ($idx -ge 0) { $line = $line.Substring(0,$idx) } $hidx = ("$line ".Replace("`t"," ")).ToLowerInvariant().IndexOf(" $hostName ") if ($hidx -ge 0 -or $line -eq "") { $hosts.RemoveAt($ln) | Out-Null } else { $ln++ } } if ("$ipAddress" -ne "") { $hosts.Add("$ipAddress $hostName") | Out-Null } $content = [System.Text.Encoding]::ASCII.GetBytes($($hosts -join [Environment]::NewLine)+[Environment]::NewLine) $file.Seek(0, [System.IO.SeekOrigin]::Begin) | Out-Null $file.Write($content, 0, $content.Length) $file.SetLength($content.Length) $file.Flush() } finally { if ($file) { $file.Dispose() } } |