mirror of
https://github.com/xcp-ng/xenadmin.git
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442 lines
17 KiB
C#
442 lines
17 KiB
C#
/*
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* Copyright (c) Citrix Systems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1) Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Net;
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using System.Net.Sockets;
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using System.Text;
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using System.Net.Security;
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using System.Security.Cryptography.X509Certificates;
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namespace XenAPI
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{
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public partial class HTTP
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{
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public class TooManyRedirectsException : Exception
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{
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private readonly int redirect;
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private readonly Uri uri;
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public TooManyRedirectsException(int redirect, Uri uri)
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{
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this.redirect = redirect;
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this.uri = uri;
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}
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}
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public class BadServerResponseException : Exception
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{
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public BadServerResponseException(string msg)
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: base(msg)
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{ }
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}
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public class CancelledException : Exception
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{
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}
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public delegate bool FuncBool();
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public delegate void UpdateProgressDelegate(int percent);
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public delegate void DataCopiedDelegate(long bytes);
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// Size of byte buffer used for GETs and PUTs
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// (not the socket rx buffer)
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public const int BUFFER_SIZE = 32 * 1024;
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public const int MAX_REDIRECTS = 10;
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public const int DEFAULT_HTTPS_PORT = 443;
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#region Helper functions
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private static void WriteLine(String txt, Stream stream)
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{
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byte[] bytes = System.Text.Encoding.ASCII.GetBytes(String.Format("{0}\r\n", txt));
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stream.Write(bytes, 0, bytes.Length);
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}
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private static void WriteLine(Stream stream)
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{
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WriteLine("", stream);
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}
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private static string ReadLine(Stream stream)
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{
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System.Text.StringBuilder result = new StringBuilder();
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while (true)
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{
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int b = stream.ReadByte();
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if (b == -1)
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throw new EndOfStreamException();
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char c = Convert.ToChar(b);
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result.Append(c);
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if (c == '\n')
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return result.ToString();
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}
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}
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/// <summary>
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/// Read HTTP headers, doing any redirects as necessary
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/// </summary>
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/// <param name="stream"></param>
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/// <returns>True if a redirect has occurred - headers will need to be resent.</returns>
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private static bool ReadHttpHeaders(ref Stream stream, IWebProxy proxy, bool nodelay, int timeout_ms)
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{
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string response = ReadLine(stream);
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int code = getResultCode(response);
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switch (code)
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{
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case 200:
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break;
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case 302:
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string url = "";
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while (true)
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{
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response = ReadLine(stream);
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if (response.StartsWith("Location: "))
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url = response.Substring(10);
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if (response.Equals("\r\n") || response.Equals("\n") || response.Equals(""))
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break;
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}
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Uri redirect = new Uri(url.Trim());
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stream.Close();
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stream = ConnectStream(redirect, proxy, nodelay, timeout_ms);
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return true; // headers need to be sent again
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default:
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if (response.EndsWith("\r\n"))
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response = response.Substring(0, response.Length - 2);
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else if (response.EndsWith("\n"))
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response = response.Substring(0, response.Length - 1);
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stream.Close();
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throw new BadServerResponseException(string.Format("Received error code {0} from the server", response));
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}
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while (true)
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{
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string line = ReadLine(stream);
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if (System.Text.RegularExpressions.Regex.Match(line, "^\\s*$").Success)
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break;
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}
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return false;
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}
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public static int getResultCode(string line)
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{
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string[] bits = line.Split(new char[] { ' ' });
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return (bits.Length < 2 ? 0 : Int32.Parse(bits[1]));
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}
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public static bool UseSSL(Uri uri)
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{
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return uri.Scheme == "https" || uri.Port == DEFAULT_HTTPS_PORT;
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}
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private static bool ValidateServerCertificate(
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object sender,
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X509Certificate certificate,
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X509Chain chain,
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SslPolicyErrors sslPolicyErrors)
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{
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return true;
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}
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public static long CopyStream(Stream inStream, Stream outStream,
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DataCopiedDelegate progressDelegate, FuncBool cancellingDelegate)
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{
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long bytesWritten = 0;
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byte[] buffer = new byte[BUFFER_SIZE];
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DateTime lastUpdate = DateTime.Now;
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while (cancellingDelegate == null || !cancellingDelegate())
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{
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int bytesRead = inStream.Read(buffer, 0, buffer.Length);
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if (bytesRead == 0)
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break;
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outStream.Write(buffer, 0, bytesRead);
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bytesWritten += bytesRead;
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if (progressDelegate != null &&
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DateTime.Now - lastUpdate > TimeSpan.FromMilliseconds(500))
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{
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progressDelegate(bytesWritten);
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lastUpdate = DateTime.Now;
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}
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}
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if (cancellingDelegate != null && cancellingDelegate())
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throw new CancelledException();
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if (progressDelegate != null)
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progressDelegate(bytesWritten);
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return bytesWritten;
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}
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/// <summary>
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/// Build a URI from a hostname, a path, and some query arguments
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/// </summary>
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/// <param name="args">An even-length array, alternating argument names and values</param>
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/// <returns></returns>
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public static Uri BuildUri(string hostname, string path, params object[] args)
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{
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// The last argument may be an object[] in its own right, in which case we need
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// to flatten the array.
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List<object> flatargs = new List<object>();
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foreach (object arg in args)
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{
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if (arg is IEnumerable<object>)
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flatargs.AddRange((IEnumerable<object>)arg);
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else
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flatargs.Add(arg);
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}
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UriBuilder uri = new UriBuilder();
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uri.Scheme = "https";
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uri.Port = DEFAULT_HTTPS_PORT;
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uri.Host = hostname;
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uri.Path = path;
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StringBuilder query = new StringBuilder();
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for (int i = 0; i < flatargs.Count - 1; i += 2)
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{
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string kv;
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// If the argument is null, don't include it in the URL
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if (flatargs[i + 1] == null)
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continue;
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// bools are special because some xapi calls use presence/absence and some
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// use "b=true" (not "True") and "b=false". But all accept "b=true" or absent.
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if (flatargs[i + 1] is bool)
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{
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if (!((bool)flatargs[i + 1]))
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continue;
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kv = flatargs[i] + "=true";
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}
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else
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kv = flatargs[i] + "=" + Uri.EscapeDataString(flatargs[i + 1].ToString());
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if (query.Length != 0)
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query.Append('&');
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query.Append(kv);
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}
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uri.Query = query.ToString();
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return uri.Uri;
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}
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#endregion
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private static NetworkStream ConnectSocket(Uri uri, bool nodelay, int timeout_ms)
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{
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AddressFamily addressFamily = uri.HostNameType == UriHostNameType.IPv6
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? AddressFamily.InterNetworkV6
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: AddressFamily.InterNetwork;
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Socket socket =
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new Socket(addressFamily, SocketType.Stream, ProtocolType.Tcp);
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socket.NoDelay = nodelay;
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//socket.ReceiveBufferSize = 64 * 1024;
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socket.ReceiveTimeout = timeout_ms;
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socket.SendTimeout = timeout_ms;
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socket.Connect(uri.Host, uri.Port);
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return new NetworkStream(socket, true);
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}
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/// <summary>
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/// This function will connect a stream to a uri (host and port),
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/// negotiating proxies and SSL
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/// </summary>
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/// <param name="uri"></param>
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/// <param name="timeout_ms">Timeout, in ms. 0 for no timeout.</param>
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/// <returns></returns>
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public static Stream ConnectStream(Uri uri, IWebProxy proxy, bool nodelay, int timeout_ms)
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{
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IMockWebProxy mockProxy = proxy != null ? proxy as IMockWebProxy : null;
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if (mockProxy != null)
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return mockProxy.GetStream(uri);
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Stream stream;
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bool useProxy = proxy != null && !proxy.IsBypassed(uri);
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if (useProxy)
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{
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Uri proxyURI = proxy.GetProxy(uri);
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stream = ConnectSocket(proxyURI, nodelay, timeout_ms);
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}
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else
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{
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stream = ConnectSocket(uri, nodelay, timeout_ms);
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}
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try
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{
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if (useProxy)
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{
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string line = String.Format("CONNECT {0}:{1} HTTP/1.0", uri.Host, uri.Port);
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WriteLine(line, stream);
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WriteLine(stream);
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ReadHttpHeaders(ref stream, proxy, nodelay, timeout_ms);
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}
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if (UseSSL(uri))
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{
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SslStream sslStream = new SslStream(stream, false,
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new RemoteCertificateValidationCallback(ValidateServerCertificate), null);
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sslStream.AuthenticateAsClient("");
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stream = sslStream;
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}
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return stream;
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}
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catch
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{
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stream.Close();
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throw;
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}
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}
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private static Stream DO_HTTP(Uri uri, IWebProxy proxy, bool nodelay, int timeout_ms, params string[] headers)
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{
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Stream stream = ConnectStream(uri, proxy, nodelay, timeout_ms);
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int redirects = 0;
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do
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{
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if (redirects > MAX_REDIRECTS)
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throw new TooManyRedirectsException(redirects, uri);
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redirects++;
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foreach (string header in headers)
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WriteLine(header, stream);
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WriteLine(stream);
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stream.Flush();
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}
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while (ReadHttpHeaders(ref stream, proxy, nodelay, timeout_ms));
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return stream;
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}
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//
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// The following functions do all the HTTP headers related stuff
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// returning the stream ready for use
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//
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public static Stream CONNECT(Uri uri, IWebProxy proxy, String session, int timeout_ms)
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{
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return DO_HTTP(uri, proxy, true, timeout_ms,
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string.Format("CONNECT {0} HTTP/1.0", uri.PathAndQuery),
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string.Format("Host: {0}", uri.Host),
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string.Format("Cookie: session_id={0}", session));
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}
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public static Stream PUT(Uri uri, IWebProxy proxy, long ContentLength, int timeout_ms)
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{
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return DO_HTTP(uri, proxy, false, timeout_ms,
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string.Format("PUT {0} HTTP/1.0", uri.PathAndQuery),
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string.Format("Content-Length: {0}", ContentLength));
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}
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public static Stream GET(Uri uri, IWebProxy proxy, int timeout_ms)
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{
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return DO_HTTP(uri, proxy, false, timeout_ms,
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string.Format("GET {0} HTTP/1.0", uri.PathAndQuery));
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}
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/// <summary>
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/// A general HTTP PUT method, with delegates for progress and cancelling. May throw various exceptions.
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/// </summary>
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/// <param name="progressDelegate">Delegate called periodically (500ms) with percent complete</param>
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/// <param name="cancellingDelegate">Delegate called periodically to see if need to cancel</param>
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/// <param name="uri">URI to PUT to</param>
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/// <param name="proxy">A proxy to handle the HTTP connection</param>
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/// <param name="path">Path to file to put</param>
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/// <param name="timeout_ms">Timeout for the connection in ms. 0 for no timeout.</param>
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public static void Put(UpdateProgressDelegate progressDelegate, FuncBool cancellingDelegate,
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Uri uri, IWebProxy proxy, string path, int timeout_ms)
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{
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using (Stream fileStream = new FileStream(path, FileMode.Open, FileAccess.Read),
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requestStream = PUT(uri, proxy, fileStream.Length, timeout_ms))
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{
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long len = fileStream.Length;
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DataCopiedDelegate dataCopiedDelegate = delegate(long bytes)
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{
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if (progressDelegate != null && len > 0)
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progressDelegate((int)((bytes * 100) / len));
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};
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CopyStream(fileStream, requestStream, dataCopiedDelegate, cancellingDelegate);
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}
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}
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/// <summary>
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/// A general HTTP GET method, with delegates for progress and cancelling. May throw various exceptions.
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/// </summary>
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/// <param name="dataRxDelegate">Delegate called periodically (500 ms) with the number of bytes transferred</param>
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/// <param name="cancellingDelegate">Delegate called periodically to see if need to cancel</param>
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/// <param name="uri">URI to GET from</param>
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/// <param name="proxy">A proxy to handle the HTTP connection</param>
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/// <param name="path">Path to file to receive the data</param>
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/// <param name="timeout_ms">Timeout for the connection in ms. 0 for no timeout.</param>
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public static void Get(DataCopiedDelegate dataCopiedDelegate, FuncBool cancellingDelegate,
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Uri uri, IWebProxy proxy, string path, int timeout_ms)
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{
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string tmpFile = Path.GetTempFileName();
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try
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{
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using (Stream fileStream = new FileStream(tmpFile, FileMode.Create, FileAccess.Write, FileShare.None),
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downloadStream = GET(uri, proxy, timeout_ms))
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{
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CopyStream(downloadStream, fileStream, dataCopiedDelegate, cancellingDelegate);
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fileStream.Flush();
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}
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File.Delete(path);
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File.Move(tmpFile, path);
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}
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finally
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{
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File.Delete(tmpFile);
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}
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}
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}
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}
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