kenneth@hexad.dk
c74092f8a9
Now the WebRequest.Timeout property ONLY affects the GetRequestStream() and GetResponse() methods as the documentation says it SHOULD. git-svn-id: https://duplicati.googlecode.com/svn/trunk@1331 59da171f-624f-0410-aa54-27559c288bec
770 lines
30 KiB
C#
770 lines
30 KiB
C#
#region Disclaimer / License
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// Copyright (C) 2011, Kenneth Skovhede
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// http://www.hexad.dk, opensource@hexad.dk
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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//
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace Duplicati.Library.Utility
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{
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public static class Utility
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{
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/// <summary>
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/// Size of buffers for copying stream
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/// </summary>
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public static long DEFAULT_BUFFER_SIZE = 64 * 1024;
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/// <summary>
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/// A value indicating if the current process is running in 64bit mode
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/// </summary>
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public static readonly bool Is64BitProcess = IntPtr.Size == 8;
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/// <summary>
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/// Gets the hash algorithm used for calculating a hash
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/// </summary>
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public static string HashAlgorithm { get { return "SHA256"; } }
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/// <summary>
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/// The EPOCH offset (unix style)
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/// </summary>
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public static readonly DateTime EPOCH = new DateTime(1970, 1, 1, 0, 0, 0);
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/// <summary>
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/// An enumeration used to identify file types when performing file listings
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/// </summary>
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public enum EnumeratedFileStatus
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{
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File,
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Folder,
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Error
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};
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/// <summary>
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/// The callback delegate type used to collecting file information
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/// </summary>
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/// <param name="rootpath">The path that the file enumeration started at</param>
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/// <param name="path">The current element</param>
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/// <param name="status">The type of the element</param>
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public delegate void EnumerationCallbackDelegate(string rootpath, string path, EnumeratedFileStatus status);
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/// <summary>
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/// Copies the content of one stream into another
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/// </summary>
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/// <param name="source">The stream to read from</param>
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/// <param name="target">The stream to write to</param>
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public static void CopyStream(System.IO.Stream source, System.IO.Stream target)
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{
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CopyStream(source, target, true);
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}
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/// <summary>
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/// Copies the content of one stream into another
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/// </summary>
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/// <param name="source">The stream to read from</param>
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/// <param name="target">The stream to write to</param>
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/// <param name="tryRewindSource">True if an attempt should be made to rewind the source stream, false otherwise</param>
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public static void CopyStream(System.IO.Stream source, System.IO.Stream target, bool tryRewindSource)
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{
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if (tryRewindSource && source.CanSeek)
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try { source.Position = 0; }
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catch { }
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byte[] buf = new byte[DEFAULT_BUFFER_SIZE];
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int read;
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while ((read = source.Read(buf, 0, buf.Length)) != 0)
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target.Write(buf, 0, read);
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}
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/// <summary>
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/// Returns a list of all files found in the given folder.
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/// The search is recursive.
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/// </summary>
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/// <param name="basepath">The folder to look in</param>
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/// <returns>A list of the full filenames</returns>
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public static List<string> EnumerateFiles(string basepath)
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{
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return EnumerateFiles(basepath, null);
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}
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/// <summary>
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/// Returns a list of folder names found in the given folder.
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/// The search is recursive.
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/// </summary>
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/// <param name="basepath">The folder to look in</param>
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/// <returns>A list of the full paths</returns>
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public static List<string> EnumerateFolders(string basepath)
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{
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return EnumerateFolders(basepath, null);
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}
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/// <summary>
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/// A callback delegate used for applying alternate enumeration of filesystems
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/// </summary>
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/// <param name="path">The path to return data from</param>
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/// <returns>A list of paths</returns>
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public delegate string[] FileSystemInteraction(string path);
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/// <summary>
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/// Returns a list of all files found in the given folder.
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/// The search is recursive.
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/// </summary>
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/// <param name="rootpath">The folder to look in</param>
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/// <param name="filter">An optional filter to apply to the filenames</param>
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/// <param name="callback">The function to call with the filenames</param>
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/// <returns>A list of the full filenames</returns>
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public static void EnumerateFileSystemEntries(string rootpath, FilenameFilter filter, EnumerationCallbackDelegate callback)
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{
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EnumerateFileSystemEntries(rootpath, filter, callback, new FileSystemInteraction(System.IO.Directory.GetDirectories), new FileSystemInteraction(System.IO.Directory.GetFiles));
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}
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/// <summary>
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/// Returns a list of all files found in the given folder.
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/// The search is recursive.
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/// </summary>
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/// <param name="rootpath">The folder to look in</param>
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/// <param name="filter">An optional filter to apply to the filenames</param>
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/// <param name="callback">The function to call with the filenames</param>
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/// <param name="folderList">A function to call that lists all folders in the supplied folder</param>
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/// <param name="fileList">A function to call that lists all files in the supplied folder</param>
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/// <returns>A list of the full filenames</returns>
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public static void EnumerateFileSystemEntries(string rootpath, FilenameFilter filter, EnumerationCallbackDelegate callback, FileSystemInteraction folderList, FileSystemInteraction fileList)
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{
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if (!System.IO.Directory.Exists(rootpath))
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return;
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Queue<string> lst = new Queue<string>();
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lst.Enqueue(rootpath);
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while (lst.Count > 0)
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{
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string f = AppendDirSeparator(lst.Dequeue());
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try
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{
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foreach (string s in folderList(f))
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if (filter == null || filter.ShouldInclude(rootpath, AppendDirSeparator(s)))
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lst.Enqueue(s);
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callback(rootpath, f, EnumeratedFileStatus.Folder);
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}
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catch (System.Threading.ThreadAbortException)
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{
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throw;
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}
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catch (Exception)
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{
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callback(rootpath, f, EnumeratedFileStatus.Error);
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}
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try
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{
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foreach (string s in fileList(f))
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if (filter == null || filter.ShouldInclude(rootpath, s))
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callback(rootpath, s, EnumeratedFileStatus.File);
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}
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catch (System.Threading.ThreadAbortException)
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{
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throw;
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}
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catch (Exception)
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{
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callback(rootpath, f, EnumeratedFileStatus.Error);
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}
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}
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}
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/// <summary>
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/// An internal helper class to collect filenames from the enumeration callback
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/// </summary>
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private class PathCollector
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{
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private List<string> m_files;
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private bool m_includeFolders;
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private bool m_includeFiles;
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public PathCollector(bool includeFolders, bool includeFiles)
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{
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m_files = new List<string>();
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m_includeFolders = includeFolders;
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m_includeFiles = includeFiles;
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}
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public void Callback(string rootpath, string path, EnumeratedFileStatus status)
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{
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if (m_includeFolders && status == EnumeratedFileStatus.Folder)
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m_files.Add(path);
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else if (m_includeFiles && status == EnumeratedFileStatus.File)
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m_files.Add(path);
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}
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public List<string> Files { get { return m_files; } }
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}
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/// <summary>
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/// An internal helper class to calculate the size of a folders files
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/// </summary>
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private class PathSizeCalculator
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{
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private long m_size = 0;
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public void Callback(string rootpath, string path, EnumeratedFileStatus status)
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{
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if (status == EnumeratedFileStatus.File)
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try { m_size += new System.IO.FileInfo(path).Length; }
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catch { }
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}
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public long Size { get { return m_size; } }
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}
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/// <summary>
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/// Calculates the size of files in a given folder
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/// </summary>
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/// <param name="folder">The folder to examine</param>
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/// <param name="filter">A filter to apply</param>
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/// <returns>The combined size of all files that match the filter</returns>
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public static long GetDirectorySize(string folder, FilenameFilter filter)
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{
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PathSizeCalculator c = new PathSizeCalculator();
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EnumerateFileSystemEntries(folder, filter, new EnumerationCallbackDelegate(c.Callback));
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return c.Size;
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}
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/// <summary>
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/// Returns a list of all files found in the given folder.
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/// The search is recursive.
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/// </summary>
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/// <param name="basepath">The folder to look in</param>
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/// <param name="filter">An optional filter to apply to the filenames</param>
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/// <returns>A list of the full filenames</returns>
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public static List<string> EnumerateFiles(string basepath, FilenameFilter filter)
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{
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PathCollector c = new PathCollector(false, true);
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EnumerateFileSystemEntries(basepath, filter, new EnumerationCallbackDelegate(c.Callback));
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return c.Files;
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}
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/// <summary>
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/// Returns a list of all files and subfolders found in the given folder.
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/// The search is recursive.
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/// </summary>
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/// <param name="basepath">The folder to look in.</param>
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/// <returns>A list of the full filenames and foldernames. Foldernames ends with the directoryseparator char</returns>
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public static List<string> EnumerateFileSystemEntries(string basepath)
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{
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return EnumerateFileSystemEntries(basepath, null);
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}
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/// <summary>
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/// Returns a list of all files and subfolders found in the given folder.
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/// The search is recursive.
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/// </summary>
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/// <param name="basepath">The folder to look in.</param>
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/// <param name="filter">An optional filter to apply to the filenames</param>
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/// <returns>A list of the full filenames and foldernames. Foldernames ends with the directoryseparator char</returns>
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public static List<string> EnumerateFileSystemEntries(string basepath, FilenameFilter filter)
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{
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PathCollector c = new PathCollector(true, true);
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EnumerateFileSystemEntries(basepath, filter, new EnumerationCallbackDelegate(c.Callback));
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return c.Files;
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}
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/// <summary>
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/// Returns a list of folder names found in the given folder.
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/// The search is recursive.
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/// </summary>
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/// <param name="basepath">The folder to look in</param>
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/// <param name="filter">An optional filter to apply to the folder names</param>
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/// <returns>A list of the full paths</returns>
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public static List<string> EnumerateFolders(string basepath, FilenameFilter filter)
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{
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PathCollector c = new PathCollector(true, false);
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EnumerateFileSystemEntries(basepath, filter, new EnumerationCallbackDelegate(c.Callback));
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return c.Files;
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}
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/// <summary>
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/// A cached instance of the directory separator as a string
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/// </summary>
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public static readonly string DirectorySeparatorString = System.IO.Path.DirectorySeparatorChar.ToString();
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/// <summary>
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/// Appends the appropriate directory separator to paths, depending on OS.
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/// Does not append the separator if the path already ends with it.
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/// </summary>
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/// <param name="path">The path to append to</param>
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/// <returns>The path with the directory separator appended</returns>
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public static string AppendDirSeparator(string path)
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{
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if (!path.EndsWith(DirectorySeparatorString))
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return path += DirectorySeparatorString;
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else
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return path;
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}
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/// <summary>
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/// Some streams can return a number that is less than the requested number of bytes.
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/// This is usually due to fragmentation, and is solved by issuing a new read.
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/// This function wraps that functionality.
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/// </summary>
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/// <param name="stream">The stream to read</param>
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/// <param name="buf">The buffer to read into</param>
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/// <param name="count">The amout of bytes to read</param>
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/// <returns>The actual number of bytes read</returns>
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public static int ForceStreamRead(System.IO.Stream stream, byte[] buf, int count)
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{
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int a;
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int index = 0;
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do
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{
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a = stream.Read(buf, index, count);
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index += a;
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count -= a;
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}
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while (a != 0 && count > 0);
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return index;
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}
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/// <summary>
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/// Compares two streams to see if they are binary equals
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/// </summary>
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/// <param name="stream1">One stream</param>
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/// <param name="stream2">Another stream</param>
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/// <param name="checkLength">True if the length of the two streams should be compared</param>
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/// <returns>True if they are equal, false otherwise</returns>
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public static bool CompareStreams(System.IO.Stream stream1, System.IO.Stream stream2, bool checkLength)
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{
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if (checkLength)
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{
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try
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{
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if (stream1.Length != stream2.Length)
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return false;
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}
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catch
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{
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//We must read along, trying to determine if they are equals
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}
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}
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int longSize = BitConverter.GetBytes((long)0).Length;
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byte[] buf1 = new byte[longSize * 512];
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byte[] buf2 = new byte[buf1.Length];
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int a1, a2;
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while ((a1 = ForceStreamRead(stream1, buf1, buf1.Length)) == (a2 = ForceStreamRead(stream2, buf2, buf2.Length)))
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{
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int ix = 0;
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for (int i = 0; i < a1 / longSize; i++)
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if (BitConverter.ToUInt64(buf1, ix) != BitConverter.ToUInt64(buf2, ix))
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return false;
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else
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ix += longSize;
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for (int i = 0; i < a1 % longSize; i++)
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if (buf1[ix] != buf2[ix])
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return false;
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else
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ix++;
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if (a1 == 0)
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break;
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}
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return a1 == a2;
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}
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/// <summary>
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/// Removes an entire folder, and its contents.
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/// Equal to System.IO.Directory.Delete
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/// </summary>
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/// <param name="path">The folder to remove</param>
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public static void DeleteFolder(string path)
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{
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if (!System.IO.Directory.Exists(path))
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return;
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foreach (string s in EnumerateFiles(path))
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{
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System.IO.File.SetAttributes(s, System.IO.FileAttributes.Normal);
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System.IO.File.Delete(s);
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}
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List<string> folders = Utility.EnumerateFolders(path);
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folders.Sort();
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folders.Reverse();
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foreach (string s in folders)
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System.IO.Directory.Delete(s);
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System.IO.Directory.Delete(path);
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}
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/// <summary>
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/// Calculates the hash of a given file, and returns the results as an base64 encoded string
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/// </summary>
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/// <param name="path">The path to the file to calculate the hash for</param>
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/// <returns>The base64 encoded hash</returns>
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public static string CalculateHash(string path)
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{
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using (System.IO.FileStream fs = System.IO.File.Open(path, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read))
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return CalculateHash(fs);
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}
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/// <summary>
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/// Calculates the hash of a given stream, and returns the results as an base64 encoded string
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/// </summary>
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/// <param name="path">The stream to calculate the hash for</param>
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/// <returns>The base64 encoded hash</returns>
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public static string CalculateHash(System.IO.Stream stream)
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{
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return Convert.ToBase64String(System.Security.Cryptography.HashAlgorithm.Create(HashAlgorithm).ComputeHash(stream));
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}
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/// <summary>
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/// Formats a size into a human readable format, eg. 2048 becomes "2 KB".
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/// </summary>
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/// <param name="size">The size to format</param>
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/// <returns>A human readable string representing the size</returns>
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public static string FormatSizeString(long size)
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{
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if (size >= 1024 * 1024 * 1024 * 1024L)
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return string.Format(Strings.Utility.FormatStringTB, (double)size / (1024 * 1024 * 1024 * 1024L));
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else if (size >= 1024 * 1024 * 1024)
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return string.Format(Strings.Utility.FormatStringGB, (double)size / (1024 * 1024 * 1024));
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else if (size >= 1024 * 1024)
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return string.Format(Strings.Utility.FormatStringMB, (double)size / (1024 * 1024));
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else if (size >= 1024)
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return string.Format(Strings.Utility.FormatStringKB, (double)size / 1024);
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else
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return string.Format(Strings.Utility.FormatStringB, size);
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}
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public static System.Threading.ThreadPriority ParsePriority(string value)
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{
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if (string.IsNullOrEmpty(value) || value.Trim().Length == 0)
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return System.Threading.ThreadPriority.Normal;
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switch (value.ToLower().Trim())
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{
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case "+2":
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case "high":
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case "highest":
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return System.Threading.ThreadPriority.Highest;
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case "+1":
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case "abovenormal":
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case "above normal":
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return System.Threading.ThreadPriority.AboveNormal;
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case "-1":
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case "belownormal":
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case "below normal":
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return System.Threading.ThreadPriority.BelowNormal;
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case "-2":
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case "low":
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case "lowest":
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case "idle":
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return System.Threading.ThreadPriority.Lowest;
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default:
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return System.Threading.ThreadPriority.Normal;
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}
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}
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/// <summary>
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/// Parses a string into a boolean value
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/// </summary>
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/// <param name="value">The value to parse</param>
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/// <param name="default">The default value, in case the string is not a valid boolean value</param>
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/// <returns>The parsed value or the default value</returns>
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public static bool ParseBool(string value, bool @default)
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{
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if (value == null)
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value = "";
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switch (value.Trim().ToLower())
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{
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case "1":
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case "on":
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case "true":
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case "yes":
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return true;
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case "0":
|
|
case "off":
|
|
case "false":
|
|
case "no":
|
|
return false;
|
|
default:
|
|
return @default;
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Parses an option from the option set, using the convention that if the option is set, it is true unless it parses to false, and false otherwise
|
|
/// </summary>
|
|
/// <param name="options">The set of options to look for the setting in</param>
|
|
/// <param name="value">The value to look for in the settings</param>
|
|
/// <returns></returns>
|
|
public static bool ParseBoolOption(IDictionary<string, string> options, string value)
|
|
{
|
|
string opt;
|
|
if (options.TryGetValue(value, out opt))
|
|
return ParseBool(opt, true);
|
|
else
|
|
return false;
|
|
|
|
}
|
|
|
|
/// <summary>
|
|
/// A helper for converting byte arrays to hex, vice versa
|
|
/// </summary>
|
|
private const string HEX_DIGITS_UPPER = "0123456789ABCDEF";
|
|
|
|
/// <summary>
|
|
/// Converts the byte array to hex digits
|
|
/// </summary>
|
|
/// <param name="data">The data to convert</param>
|
|
/// <returns>The data as a string of hex digits</returns>
|
|
public static string ByteArrayAsHexString(byte[] data)
|
|
{
|
|
if (data == null || data.Length == 0)
|
|
return "";
|
|
|
|
StringBuilder sb = new StringBuilder();
|
|
foreach (byte b in data)
|
|
{
|
|
sb.Append(HEX_DIGITS_UPPER[(b >> 4) & 0xF]);
|
|
sb.Append(HEX_DIGITS_UPPER[b & 0xF]);
|
|
}
|
|
|
|
return sb.ToString();
|
|
}
|
|
|
|
/// <summary>
|
|
/// Converts the given hex string into a byte array
|
|
/// </summary>
|
|
/// <param name="hex">The hex string</param>
|
|
/// <returns>The byte array</returns>
|
|
public static byte[] HexStringAsByteArray(string hex)
|
|
{
|
|
if (string.IsNullOrEmpty(hex))
|
|
return new byte[0];
|
|
|
|
hex = hex.Trim().ToUpper();
|
|
|
|
if (hex.Length % 2 != 0)
|
|
throw new Exception(Strings.Utility.InvalidHexStringLengthError);
|
|
|
|
byte[] data = new byte[hex.Length];
|
|
for (int i = 0; i < hex.Length; i+= 2)
|
|
{
|
|
int upper = HEX_DIGITS_UPPER.IndexOf(hex[i]);
|
|
int lower = HEX_DIGITS_UPPER.IndexOf(hex[i + 1]);
|
|
|
|
if (upper < 0)
|
|
throw new Exception(string.Format(Strings.Utility.InvalidHexDigitError, hex[i]));
|
|
if (lower < 0)
|
|
throw new Exception(string.Format(Strings.Utility.InvalidHexDigitError, hex[i + 1]));
|
|
|
|
data[i % 2] = (byte)((upper << 4) | lower);
|
|
}
|
|
|
|
return data;
|
|
}
|
|
|
|
private static string UNAME;
|
|
|
|
/// <value>
|
|
/// Gets or sets a value indicating if the client is running OSX
|
|
/// </value>
|
|
public static bool IsClientOSX
|
|
{
|
|
get
|
|
{
|
|
if(!IsClientLinux)
|
|
return false;
|
|
|
|
try
|
|
{
|
|
if (UNAME == null)
|
|
{
|
|
var psi = new System.Diagnostics.ProcessStartInfo("uname");
|
|
psi.RedirectStandardOutput = true;
|
|
psi.UseShellExecute = false;
|
|
|
|
var pi = System.Diagnostics.Process.Start(psi);
|
|
pi.WaitForExit(5000);
|
|
if (pi.HasExited)
|
|
UNAME = pi.StandardOutput.ReadToEnd().Trim();
|
|
}
|
|
}
|
|
catch {}
|
|
|
|
return "Darwin".Equals(UNAME);
|
|
|
|
}
|
|
}
|
|
|
|
/// <value>
|
|
/// Gets or sets a value indicating if the client is Linux/Unix based
|
|
/// </value>
|
|
public static bool IsClientLinux
|
|
{
|
|
get
|
|
{
|
|
#if __MonoCS__
|
|
if (Environment.OSVersion.Platform == PlatformID.Unix || (int)Environment.OSVersion.Platform == 6)
|
|
return true;
|
|
#else
|
|
if (Environment.OSVersion.Platform == PlatformID.Unix || Environment.OSVersion.Platform == PlatformID.MacOSX)
|
|
return true;
|
|
#endif
|
|
return false;
|
|
|
|
}
|
|
}
|
|
|
|
/// <value>
|
|
/// Returns a value indicating if the filesystem, is case sensitive
|
|
/// </value>
|
|
public static bool IsFSCaseSensitive
|
|
{
|
|
get
|
|
{
|
|
//TODO: This should probably be determined by filesystem rather than OS
|
|
//In case MS decides to support case sensitive filesystems (yeah right :))
|
|
return IsClientLinux;
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Returns a value indicating if the app is running under Mono
|
|
/// </summary>
|
|
public static bool IsMono
|
|
{
|
|
get
|
|
{
|
|
return Type.GetType("Mono.Runtime") != null;
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the current Mono runtime version, will return 0.0 if not running Mono
|
|
/// </summary>
|
|
public static Version MonoVersion
|
|
{
|
|
get
|
|
{
|
|
try
|
|
{
|
|
Type t = Type.GetType("Mono.Runtime");
|
|
if (t != null)
|
|
{
|
|
System.Reflection.MethodInfo mi = t.GetMethod("GetDisplayName", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.NonPublic);
|
|
if (mi != null)
|
|
{
|
|
string version = (string)mi.Invoke(null, null);
|
|
return new Version(version.Substring(version.Trim().LastIndexOf(' ')));
|
|
}
|
|
}
|
|
}
|
|
catch
|
|
{
|
|
}
|
|
|
|
return new Version();
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the users default UI language
|
|
/// </summary>
|
|
public static System.Globalization.CultureInfo DefaultCulture
|
|
{
|
|
get
|
|
{
|
|
System.Threading.Thread t = new System.Threading.Thread(new System.Threading.ThreadStart(DummyMethod));
|
|
return t.CurrentUICulture;
|
|
}
|
|
}
|
|
|
|
//Unused function, used to create a dummy thread
|
|
private static void DummyMethod() { }
|
|
|
|
/// <summary>
|
|
/// Gets a string comparer that matches the client filesystems case sensitivity
|
|
/// </summary>
|
|
public static StringComparer ClientFilenameStringComparer { get { return Utility.IsFSCaseSensitive ? StringComparer.CurrentCulture : StringComparer.CurrentCultureIgnoreCase; } }
|
|
|
|
/// <summary>
|
|
/// Gets the string comparision that matches the client filesystems case sensitivity
|
|
/// </summary>
|
|
public static StringComparison ClientFilenameStringComparision { get { return Utility.IsFSCaseSensitive ? StringComparison.CurrentCulture : StringComparison.CurrentCultureIgnoreCase; } }
|
|
|
|
/// <summary>
|
|
/// Searches the system paths for the file specified
|
|
/// </summary>
|
|
/// <param name="filename">The file to locate</param>
|
|
/// <returns>The full path to the file, or null if the file was not found</returns>
|
|
public static string LocateFileInSystemPath(string filename)
|
|
{
|
|
try
|
|
{
|
|
if (System.IO.Path.IsPathRooted(filename))
|
|
return System.IO.File.Exists(filename) ? filename : null;
|
|
|
|
try { filename = System.IO.Path.GetFileName(filename); }
|
|
catch { }
|
|
|
|
string homedir = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location) + System.IO.Path.PathSeparator.ToString();
|
|
|
|
//Look in application base folder and all system path folders
|
|
foreach (string s in (homedir + Environment.GetEnvironmentVariable("PATH")).Split(System.IO.Path.PathSeparator))
|
|
if (!string.IsNullOrEmpty(s) && s.Trim().Length > 0)
|
|
try
|
|
{
|
|
foreach (string sx in System.IO.Directory.GetFiles(Environment.ExpandEnvironmentVariables(s), filename))
|
|
return sx;
|
|
}
|
|
catch
|
|
{ }
|
|
}
|
|
catch
|
|
{ }
|
|
|
|
return null;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Checks that a hostname is valid
|
|
/// </summary>
|
|
/// <param name="hostname">The hostname to verify</param>
|
|
/// <returns>True if the hostname is valid, false otherwise</returns>
|
|
public static bool IsValidHostname(string hostname)
|
|
{
|
|
try { return Uri.CheckHostName(hostname) != UriHostNameType.Unknown; }
|
|
catch { return false; }
|
|
}
|
|
}
|
|
}
|