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SCIClient.cs
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SCIClient.cs
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/*
* Copyright 2020 Sitemorse Ltd. All rights reserved.
*
*/
/**
* Implement the Sitemorse CMS Integration (SCI) Client protocol.
*
* @author Sitemorse (UK Sales) Ltd
* @version 1.2
*/
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Net.Sockets;
using System.Net;
using System.Security.Cryptography;
using Newtonsoft.Json.Linq;
using System.Net.Security;
namespace com.sitemorse.sci
{
public class SCIClient
{
#region Static Fields
/**
* The default hostname of the SCI server.
*/
private static String SCI_DEFAULT_SERVER = "sci.sitemorse.com";
/**
* The default TCP port to connect to on the SCI server, when not using SSL.
*/
private static int SCI_DEFAULT_PORT = 5371;
/**
* The default TCP port to connect to on the SCI server, when using SSL.
*/
private static int SCI_DEFAULT_SSL_PORT = 5372;
/* The default TCP port for an HTTP proxy server.*/
private static int HTTP_PROXY_PORT = 3128;
/**
* The time-out when connecting to the SCI server, in milliseconds.
*/
private static int SCI_CONNECT_TIMEOUT = 30 * 1000;
/**
* The time-out when reading from the SCI server, in milliseconds.
*/
private static int SCI_READ_TIMEOUT = 240 * 1000;
/**
* The time-out for performing the web request, in milliseconds.
*/
private static int WEB_TIMEOUT = 60 * 1000;
/**
* The buffer size to use when reading HTTP request/response bodies. This
* needs to be small in order for the WEB_TIMEOUT to work properly.
*/
private static int BUFFER_SIZE = 512;
/**
* Lines are ended by carriage-return then line-feed (0x0d 0x0a).
*/
private static String CRLF = "\r\n";
/**
* We use ISO-8859-1 when reading and writing from sockets. This is because
* it is an 8-bit single-byte character set and is a superset of US-ASCII,
* but we don't actually ever treat top-bit-set bytes as any other than
* opaque binary data.
*/
private static String SCI_CHARSET = "iso-8859-1";
/**
* The Java identifier string for the HMAC-SHA1 algorithm that is used by
* the SCI protocol authentication stage.
*/
private static String SCI_HASH_ALGORITHM = "HmacSHA1";
#endregion
#region Property Fields
/**
* The host name of the SCI server.
*/
private String _ServerHostname = null;
/**
* The TCP port number of the SCI server.
*/
private int _ServerPort = 0;
/**
* Whether or not to use SSL to connect to the SCI server.
*/
private bool _ServerSecure = true;
/**
* Whether or not we should allow HTTP POST requests to be proxied through
* us.
*/
private bool _PostAllowed = false;
/**
* The configured SCI licence key.
*/
private String _LicenceKey = null;
/**
* The hostname of the HTTP proxy server to tunnel the SCI connection
* through.
*/
private String _SciProxyHostname = null;
/**
* The port number of the HTTP proxy server to tunnel the SCI connection
* through.
*/
private int _SciProxyPort = 0;
/**
* Extra headers to send with each request.
*/
private String[] _ExtraHeaders = null;
/**
* Extra query string to send with each request.
*/
private String _ExtraQuery = null;
/**
* User identifier used with non-legacy licence keys
*/
private String _User = "";
#endregion
#region Constructors
/**
* Construct an SCIClient object with the specified licence key, and default
* connection parameters.
*
* @param licenceKey
* The SCI licence key.
*/
public SCIClient(String licenceKey)
{
this._LicenceKey = licenceKey;
}
/**
* Construct an SCIClient object with the specified licence key, using the
* specified host name to connect to the SCI server.
*
* @param licenceKey
* The SCI licence key.
* @param serverHostname
* The host name to use to connect.
*/
public SCIClient(String licenceKey, String serverHostname)
{
this._ServerHostname = serverHostname;
this._LicenceKey = licenceKey;
}
/**
* Construct an SCIClient object with the specified licence key, using the
* specified host name and port to connect to the SCI server.
*
* @param licenceKey
* The SCI licence key.
* @param serverHostname
* The host name to use to connect.
* @param serverPort
* The TCP port number to use to connect.
*/
public SCIClient(String licenceKey, String serverHostname, int serverPort)
{
this._LicenceKey = licenceKey;
this._ServerHostname = serverHostname;
this._ServerPort = serverPort;
}
/**
* Construct an SCIClient object with the specified licence key, using the
* specified host name and port to connect to the SCI server, and setting
* whether or not to use SSL to connect.
*
* @param licenceKey
* The SCI licence key.
* @param serverHostname
* The host name to use to connect.
* @param serverPort
* The TCP port number to use to connect.
* @param serverSecure
* true to use SSL when connecting to the SCI server.
*/
public SCIClient(String licenceKey, String serverHostname, int serverPort,
bool serverSecure)
{
this._LicenceKey = licenceKey;
this._ServerHostname = serverHostname;
this._ServerPort = serverPort;
this._ServerSecure = serverSecure;
}
#endregion
#region Public Properties
/**
* Get the host name used when connecting to the SCI server.
*
* @return The host name used to connect to the SCI server.
*/
public String ServerHostname
{
get
{
return (_ServerHostname == null) ? SCI_DEFAULT_SERVER : _ServerHostname;
}
set
{
_ServerHostname = value;
}
}
/**
* Get the TCP port number used when connecting to the SCI server.
*
* @return The TCP port number to use.
*/
public int ServerPort
{
get
{
if (_ServerPort != 0)
return _ServerPort;
return _ServerSecure ? SCI_DEFAULT_SSL_PORT : SCI_DEFAULT_PORT;
}
set
{
_ServerPort = value;
}
}
/**
* Set whether or not the connection to the SCI server should use SSL.
*
* @param serverSecure
* true if the connection to the SSL server should use SSL.
*/
public bool ServerSecure
{
get
{
return _ServerSecure;
}
set
{
_ServerSecure = value;
}
}
/**
* Set whether or not HTTP POSTs are allowed to be proxied through us.
*
* @param postAllowed
* true if POSTs should be allowed.
*/
public bool PostAllowed
{
set
{
this._PostAllowed = value;
}
get
{
return _PostAllowed;
}
}
/**
* Set the host name of the HTTP proxy server to tunnel the SCI connection
* through.
*
* @param sciProxyHostname
* the host name to use, or null to use no proxy.
*/
public string SciProxyHostname
{
get
{
return _SciProxyHostname;
}
set
{
this._SciProxyHostname = value;
}
}
/**
* Set the TCP port number of the HTTP proxy server to tunnel the SCI
* connection through.
*
* @param sciProxyPort
* the sciProxyPort to set
*/
public int SciProxyPort
{
get
{
return _SciProxyPort == 0 ? HTTP_PROXY_PORT : _SciProxyPort;
}
set
{
_SciProxyPort = value;
}
}
/**
* Sets extra HTTP headers to send with each request that is proxied through
* this class. Each string in the array should be an RFC-822-style header,
* with no newline or carriage return at the end (e.g.
* "Cookie: UserAuth=12345678").
*
* @param extraHeaders
* the extra headers to send, or null to not send any
*/
public String[] ExtraHeaders
{
get
{
return _ExtraHeaders;
}
set
{
_ExtraHeaders = value;
}
}
/**
* Sets an extra query string to be sent with each request that is proxied
* through this class. The string should be simply the extra parameter(s) to
* send, with no "?" or trailing or leading "&" (e.g. "a=b" or "a=b&c=d").
*
* @param extraQuery
* the extra query string to send, or null to send none
*/
public string ExtraQuery
{
get
{
return _ExtraQuery;
}
set
{
_ExtraQuery = value;
}
}
public string User { get => _User; set => _User = value; }
#endregion
#region Public Methods
/**
* Perform a Sitemorse test of the specified URL. Only the specific host
* name identified in the URL itself will be proxied, all other host names
* will be connected to directly by the Sitemorse test server. The
* "snapshot-view" version of the results will be used.
*
* @param url
* The URL to test.
* @return The URL of the finished report to display to the user.
* @throws SCIException
*/
public AssessmentResponse PerformTest(String url)
{
return PerformTest(url, "snapshot-page");
}
/**
* Perform a Sitemorse test of the specified URL. Only the specific host
* name identified in the URL itself will be proxied, all other host names
* will be connected to directly by the Sitemorse test server.
*
* @param url
* The URL to test.
* @param view
* The view that should be displayed to the user when the test is
* complete. This must be one of "report", "snapshot-page" or
* "snapshot-source".
* @return The URL of the finished report to display to the user.
* @throws SCIException
*/
public AssessmentResponse PerformTest(String url, String view)
{
String[] hostNames = new String[1];
Uri urlobj;
try
{
urlobj = new Uri(url);
}
catch (UriFormatException e)
{
throw new SCIException(e);
}
hostNames[0] = urlobj.Host;
return PerformTest(url, hostNames, view);
}
/**
* Perform a Sitemorse test of the specified URL. All the specified host
* names will be proxied via the SCI client. Note that the host name
* indicated by the URL should be included in the host names list. The
* "snapshot-view" version of the results will be used.
*
* @param url
* The URL to test.
* @param hostNames
* An array of host names to proxy.
* @return The URL of the finished report to display to the user.
* @throws SCIException
*/
public AssessmentResponse PerformTest(String url, String[] hostNames)
{
return PerformTest(url, hostNames, "snapshot-page");
}
/**
* Perform a Sitemorse test of the specified URL. All the specified host
* names will be proxied via the SCI client. Note that the host name
* indicated by the URL should be included in the host names list.
*
* @param url
* The URL to test.
* @param hostNames
* An array of host names to proxy.
* @param view
* The view that should be displayed to the user when the test is
* complete. This must be one of "report", "snapshot-page" or
* "snapshot-source".
* @return The URL of the finished report to display to the user.
* @throws SCIException
*/
public AssessmentResponse PerformTest(String url, String[] hostNames, String view)
{
Socket sock = null;
Stream sciStream;
StreamReader sciIn;
StreamWriter sciOut;
String line;
Encoding encoding;
if (!(view.Equals("report") || view.Equals("snapshot-page") ||
view.Equals("snapshot-source")))
throw new SCIException("Invalid 'view' parameter");
try
{
encoding = Encoding.GetEncoding(SCI_CHARSET);
if (_SciProxyHostname != null)
{
sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
sock.SendTimeout = SCI_CONNECT_TIMEOUT;
sock.ReceiveTimeout = SCI_CONNECT_TIMEOUT;
sock.Connect(SciProxyHostname, SciProxyPort);
sock.SendTimeout = SCI_READ_TIMEOUT;
sock.ReceiveTimeout = SCI_READ_TIMEOUT;
sciStream = new NetworkStream(sock);
sciIn = new StreamReader(sciStream, encoding);
sciOut = new StreamWriter(sciStream, encoding);
sciOut.Write("CONNECT " + ServerHostname + ":"
+ ServerPort + " HTTP/1.0" + CRLF + CRLF);
sciOut.Flush();
line = sciIn.ReadLine();
if (line == null)
throw new SCIException("HTTP proxy dropped connection "
+ "after request");
if (!line.StartsWith("HTTP/1.") || line.Length < 12)
throw new SCIException("Unknown status line "
+ "from HTTP proxy: " + line);
if (!line.Substring(8, 4).Equals(" 200"))
throw new SCIException("HTTP proxy server returned "
+ "error: " + line);
while (true)
{
line = sciIn.ReadLine();
if (line == null)
throw new SCIException("HTTP proxy dropped connection "
+ "during response headers");
if (line.Length == 0)
break;
}
if (ServerSecure)
{
SslStream sslStream = new SslStream(new NetworkStream(sock));
sslStream.AuthenticateAsClient(ServerHostname);
sciIn = new StreamReader(sslStream, encoding);
sciOut = new StreamWriter(sslStream, encoding);
}
}
else
{
sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
sock.SendTimeout = SCI_CONNECT_TIMEOUT;
sock.ReceiveTimeout = SCI_CONNECT_TIMEOUT;
sock.Connect(ServerHostname, ServerPort);
sock.SendTimeout = SCI_READ_TIMEOUT;
sock.ReceiveTimeout = SCI_READ_TIMEOUT;
if (_ServerSecure)
{
SslStream sslStream = new SslStream(new NetworkStream(sock));
sslStream.AuthenticateAsClient(ServerHostname);
sciStream = sslStream;
}
else
{
sciStream = new NetworkStream(sock);
}
sciIn = new StreamReader(sciStream, encoding);
sciOut = new StreamWriter(sciStream, encoding);
}
line = sciIn.ReadLine();
if (line == null)
throw new SCIException("SCI server immediately disconnected");
if (line.Length < 16 || !line.Substring(0, 4).Equals("SCI:"))
throw new SCIException("Bad greeting line from SCI server");
if (!line.Substring(4, 1).Equals("1"))
throw new SCIException(
"SCI server is using incompatible protocol version");
sciOut.Write(generateAuthResponse(line.Substring(8)) + CRLF);
sciOut.Flush();
line = sciIn.ReadLine();
if (line == null)
throw new SCIException("SCI server disconnected"
+ " after authentication sent");
if (!line.Equals("OK"))
throw new SCIServerError(line);
JObject jsonreq = new JObject
{
{"url", url},
{"hostNames", new JArray(hostNames)},
{"view", view},
{"extendedResponse", true},
{"user", User}
};
line = jsonreq.ToString();
sciOut.Write(line.Length + CRLF + line);
sciOut.Flush();
line = sciIn.ReadLine();
if (line == null)
throw new SCIException("SCI server disconnected"
+ " after request data sent");
if (!line.Equals("OK"))
throw new SCIServerError(line);
return ProxyRequests(sciIn, sciOut, hostNames);
}
catch (SocketException e)
{
throw new SCIException(e);
}
catch (IOException e)
{
throw new SCIException(e);
}
catch (Exception e)
{
throw new SCIException(e);
}
finally
{
if (sock != null)
{
try
{
sock.Close();
}
catch (IOException)
{
}
}
}
}
#endregion
#region Private Methods
/**
* Generates the SCI authentication response string, using the configured
* licenceKey and the challenge from the SCI server.
*
* @param challenge
* Challenge string from server.
* @return Authentication response string.
* @throws SCIException
*/
private String generateAuthResponse(String challenge)
{
try
{
HMAC hmac;
switch (SCI_HASH_ALGORITHM)
{
case "HmacSHA1":
hmac = new HMACSHA1();
break;
default:
throw new Exception("Hash Algorithm not recognised");
}
Encoding encoding = Encoding.GetEncoding(SCI_CHARSET);
hmac.Key = encoding.GetBytes(_LicenceKey.Substring(8));
return _LicenceKey.Substring(0, 8)
+ hexify(hmac.ComputeHash(encoding.GetBytes(challenge)));
}
catch (ArgumentNullException e)
{
throw new SCIException(e);
}
}
/**
* Convert an array of bytes into a lower-case hexadecimal string
* representation.
*
* @param bytes
* Byte array to convert.
* @return String containing hexadecimal digits.
*/
private String hexify(byte[] bytes)
{
StringBuilder s = new StringBuilder(bytes.Length * 2);
char[] hexChars = { '0', '1', '2', '3', '4', '5', '6', '7', '8',
'9', 'a', 'b', 'c', 'd', 'e', 'f' };
for (int i = 0; i < bytes.Length; i++)
{
s.Append(hexChars[(bytes[i] >> 4) & 0x0f]);
s.Append(hexChars[bytes[i] & 0x0f]);
}
return s.ToString();
}
/**
* Implements the proxy phase of the SCI protocol. Repeatedly reads requests
* from the SCI server, validates and fulfils them, and returns the results
* to the server. Finishes when the server says the report is complete.
*
* @param sciIn
* The reader for the SCI server socket.
* @param sciOut
* The writer for the SCI server socket.
* @param hostNames
* The collection of host names we will proxy for.
* @return The URL of the finished report to display to the user.
* @throws SCIException
*/
private AssessmentResponse ProxyRequests(StreamReader sciIn, StreamWriter sciOut,
String[] hostNames)
{
String line;
Uri url;
String method, httpVersion;
List<String> headers;
int i;
long timetarget;
long now;
// int clen;
long starttime = 0;
long resptime = 0;
long endtime = 0;
String path;
String status = "";
StringBuilder data;
char[] buf = new char[BUFFER_SIZE];
Socket sock = null;
Stream webStream = null;
StreamReader webIn;
StreamWriter webOut;
Encoding encoding;
try
{
encoding = Encoding.GetEncoding(SCI_CHARSET);
while (true)
{
/* Read a request line and see what it says */
line = sciIn.ReadLine();
if (line == null)
throw new SCIException("SCI server disconnected"
+ " during proxy phase");
if (line.Equals("XSCI-NOOP"))
{
/* no-op (timeout prevention), do nothing */
continue;
}
else if (line.StartsWith("XSCI-COMPLETE "))
{
/* Test is complete, return the parameter as our result */
var uri = line.Substring(14);
var assessmentResonse = ReadExtendedResponse(sciIn);
return new AssessmentResponse(uri,assessmentResonse.Item1, assessmentResonse.Item2);
}
else if (line.StartsWith("XSCI-ERROR "))
{
/* Fatal error, throw the parameter as an exception */
throw new SCIServerError(line.Substring(11));
}
else if (!line.StartsWith("GET ")
&& !line.StartsWith("POST "))
{
throw new SCIException("Unknown SCI request: " + line);
}
/*
* It's an HTTP request, parse the request line and the URL, and
* read the headers.
*/
i = line.IndexOf(" ");
method = line.Substring(0, i);
i = line.LastIndexOf(" ");
httpVersion = line.Substring(i + 1);
if (!httpVersion.StartsWith("HTTP/1.")
|| httpVersion.Length != 8)
throw new SCIException("Unknown HTTP version: "
+ httpVersion);
url = new Uri(line.Substring(method.Length + 1, i - (method.Length + 1)));
var response = ReadExtendedResponse(sciIn);
headers = response.Item1;
data = response.Item2;
/* Security checks on the request */
if (method.Equals("POST") && !_PostAllowed)
{
sciOut.Write("XSCI accessdenied "
+ "POST actions have been disallowed" + CRLF);
sciOut.Flush();
continue;
}
if (!url.Scheme.Equals("http")
&& !url.Scheme.Equals("https"))
{
sciOut.Write("XSCI badscheme " + "URL scheme '"
+ url.Scheme + "' not allowed" + CRLF);
sciOut.Flush();
continue;
}
for (i = 0; i < hostNames.Length; i++)
{
if (hostNames[i].Equals(url.Host, StringComparison.InvariantCultureIgnoreCase))
break;
}
if (i >= hostNames.Length)
{
sciOut.Write("XSCI accessdenied "
+ "CMS proxy access denied to host '"
+ url.Host + "'" + CRLF);
sciOut.Flush();
continue;
}
if (url.Port != -1
&& (url.Port < 1 || url.Port > 65535
|| url.Port == 19 || url.Port == 25))
{
sciOut.Write("XSCI badport " + "Access denied to port "
+ url.Port + CRLF);
sciOut.Flush();
continue;
}
/*
* Forward the request to the relevant web server. This entire
* section must not take longer than WEB_TIMEOUT ms.
*/
try
{
timetarget = DateTime.Now.Ticks + WEB_TIMEOUT * TimeSpan.TicksPerMillisecond;
/* Connect to the server */
starttime = DateTime.Now.Ticks;
sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
sock.SendTimeout = WEB_TIMEOUT;
sock.ReceiveTimeout = WEB_TIMEOUT;
sock.Connect(url.Host, url.Port);
if (url.Scheme.Equals("https"))
{
SslStream sslStream = new SslStream(new NetworkStream(sock));
sslStream.AuthenticateAsClient(url.Host);
webStream = sslStream;
}
else
{
webStream = new NetworkStream(sock);
}
webIn = new StreamReader(webStream, encoding);
webOut = new StreamWriter(webStream, encoding);
/*
* Calculate the path to send in the request.
* We may need to add parameters if this.extraQuery is set.
*/
path = url.PathAndQuery;
if (ExtraQuery != null && ExtraQuery.Length > 0)
{
if (url.Query == null)
path += "?" + ExtraQuery;
else if (url.Query.Length == 0)
path += ExtraQuery;
else
path += "&" + ExtraQuery;
}
/*
* Write the request line, the headers, and the body (if
* any)
*/
webOut.Write(method + " " + path + " "
+ httpVersion + CRLF);
for (i = 0; i < headers.Count; i++)
webOut.Write(headers[i] + CRLF);
if (ExtraHeaders != null)
{
for (i = 0; i < ExtraHeaders.Length; i++)
webOut.Write(ExtraHeaders[i] + CRLF);
}
webOut.Write(CRLF);
if (data != null)
webOut.Write(data.ToString());
webOut.Flush();
/*
* Wait for the status response line, then read the headers
*/
now = DateTime.Now.Ticks;
if (now >= timetarget)
throw new TimeoutException();
sock.ReceiveTimeout = (int)((long)(timetarget - now) / TimeSpan.TicksPerMillisecond);
status = webIn.ReadLine();
resptime = DateTime.Now.Ticks;
if (status == null)
{
sciOut.Write("XSCI noeoh " + "No end-of-headers found"
+ CRLF);
continue;
}
if (!status.StartsWith("HTTP"))
{
sciOut.Write("XSCI badstatus Bad status line '" + line
+ "'" + CRLF);
continue;
}
now = DateTime.Now.Ticks;
if (now >= timetarget)
throw new TimeoutException();
headers = ReadHeaders(sock, webIn, (int)(timetarget - now));
if (headers == null)
{
sciOut.Write("XSCI noeoh " + "No end-of-headers found"
+ CRLF);
continue;
}
/*
* Read the response body, by reading all the data until the
* socket is closed by the other end.
*/
data = new StringBuilder();
while (true)
{
now = DateTime.Now.Ticks;
if (now >= timetarget)
throw new TimeoutException();
sock.ReceiveTimeout = (int)((long)(timetarget - now) / TimeSpan.TicksPerMillisecond);
i = webIn.Read(buf, 0, BUFFER_SIZE);
if (i == 0)
break;
data.Append(buf, 0, i);
}
endtime = DateTime.Now.Ticks;
}
catch (TimeoutException)
{
sciOut.Write("XSCI timeout Timeout reading from web server"
+ CRLF);
continue;
}
catch (SocketException e)
{
if (e.ErrorCode == (int)SocketError.ConnectionRefused)
{
sciOut.Write("XSCI connref Connection refused" + CRLF);
continue;
}
else if (e.ErrorCode == (int)SocketError.HostNotFound)
{
sciOut.Write("XSCI noaddr Unknown hostname" + CRLF);
continue;
}
else
{
sciOut.Write("XSCI exception " + e.Message + CRLF);
}
}
catch (IOException e)
{
sciOut.Write("XSCI exception " + e.Message + CRLF);
continue;
}
catch (Exception e)
{
sciOut.Write("XSCI exception " + e.Message + CRLF);
continue;
}
finally
{
if (sock != null)
{
try
{
sock.Close();
}
catch (IOException)
{
}
}
sock = null;
sciOut.Flush();
}
/*
* Forward the response headers and body back to the SCI server.
* Remove any Content-Length header that may already exist, and
* add a new one that we can guarantee to be correct.
*/
sciOut.Write(status + CRLF);
for (i = 0; i < headers.Count; i++)
{
if (!headers[i].ToLower()
.StartsWith("content-length:"))
sciOut.Write(headers[i] + CRLF);
}
sciOut.Write("Content-Length: " + data.Length + CRLF);
sciOut.Write("X-SCI-Response: " + ((resptime - starttime) / TimeSpan.TicksPerMillisecond) + CRLF);
sciOut.Write("X-SCI-TotalTime: " + ((endtime - starttime) / TimeSpan.TicksPerMillisecond) + CRLF);
sciOut.Write(CRLF);
sciOut.Write(data.ToString());
sciOut.Flush();
}
}
catch (IOException e)
{
throw new SCIException(e);
}
}
private Tuple<List<string>,StringBuilder> ReadExtendedResponse(StreamReader sciIn)
{
char[] buf = new char[BUFFER_SIZE];
int i;
var headers = ReadHeaders(null, sciIn, 0);
/* If there was a Content-Length header, read a body too. */
var data = new StringBuilder();
for (i = 0; i < headers.Count; i++)
{
if (!headers[i].ToLower()
.StartsWith("content-length:")) continue;
var clen = int.Parse(headers[i].Substring(16));
data = new StringBuilder(clen);
while (clen > 0)
{
i = sciIn.Read(buf, 0,
clen > BUFFER_SIZE ? BUFFER_SIZE : clen);
if (i == -1)
throw new SCIException("SCI server "
+ " disconnected while sending"
+ " HTTP body");
data.Append(buf, 0, i);
clen -= i;
}
break;
}
return Tuple.Create(headers,data);
}
/**
* Reads a set of RFC 822-style headers from a stream. If the socket and a
* time-out are also provided, it will ensure that the entire operation
* takes place within that time-out - otherwise, socket may be null and the
* time-out should be 0. Returns null if the socket closes before the
* end-of-headers marker is reached.
*
* @param sock
* The underlying socket being read from.
* @param in