web
namespace Imtiaz
{
using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading ;
class MyWebServer
{
private TcpListener myListener ;
private int port = 5050 ; // Select any free port you wish
//The constructor which make the TcpListener start listening on the
//given port. It also calls a Thread on the method StartListen().
public MyWebServer()
{
try
{
//start listing on the given port
myListener = new TcpListener(port) ;
myListener.Start();
Console.WriteLine("Web Server Running... Press ^C to Stop...");
//start the thread which calls the method 'StartListen'
Thread th = new Thread(new ThreadStart(StartListen));
th.Start() ;
}
catch(Exception e)
{
Console.WriteLine("An Exception Occurred while Listening :" +e.ToString());
}
}
/// <summary>
/// Returns The Default File Name
/// Input : WebServerRoot Folder
/// Output: Default File Name
/// </summary>
/// <param name="sMyWebServerRoot"></param>
/// <returns></returns>
public string GetTheDefaultFileName(string sLocalDirectory)
{
StreamReader sr;
String sLine = "";
try
{
//Open the default.dat to find out the list
// of default file
sr = new StreamReader("data\\Default.Dat");
while ((sLine = sr.ReadLine()) != null)
{
//Look for the default file in the web server root folder
if (File.Exists( sLocalDirectory + sLine) == true)
break;
}
}
catch(Exception e)
{
Console.WriteLine("An Exception Occurred : " + e.ToString());
}
if (File.Exists( sLocalDirectory + sLine) == true)
return sLine;
else
return "";
}
/// <summary>
/// This function takes FileName as Input and returns the mime type..
/// </summary>
/// <param name="sRequestedFile">To indentify the Mime Type</param>
/// <returns>Mime Type</returns>
public string GetMimeType(string sRequestedFile)
{
StreamReader sr;
String sLine = "";
String sMimeType = "";
String sFileExt = "";
String sMimeExt = "";
// Convert to lowercase
sRequestedFile = sRequestedFile.ToLower();
int iStartPos = sRequestedFile.IndexOf(".");
sFileExt = sRequestedFile.Substring(iStartPos);
try
{
//Open the Vdirs.dat to find out the list virtual directories
sr = new StreamReader("data\\Mime.Dat");
while ((sLine = sr.ReadLine()) != null)
{
sLine.Trim();
if (sLine.Length > 0)
{
//find the separator
iStartPos = sLine.IndexOf(";");
// Convert to lower case
sLine = sLine.ToLower();
sMimeExt = sLine.Substring(0,iStartPos);
sMimeType = sLine.Substring(iStartPos + 1);
if (sMimeExt == sFileExt)
break;
}
}
}
catch (Exception e)
{
Console.WriteLine("An Exception Occurred : " + e.ToString());
}
if (sMimeExt == sFileExt)
return sMimeType;
else
return "";
}
/// <summary>
/// Returns the Physical Path
/// </summary>
/// <param name="sMyWebServerRoot">Web Server Root Directory</param>
/// <param name="sDirName">Virtual Directory </param>
/// <returns>Physical local Path</returns>
public string GetLocalPath(string sMyWebServerRoot, string sDirName)
{
StreamReader sr;
String sLine = "";
String sVirtualDir = "";
String sRealDir = "";
int iStartPos = 0;
//Remove extra spaces
sDirName.Trim();
// Convert to lowercase
sMyWebServerRoot = sMyWebServerRoot.ToLower();
// Convert to lowercase
sDirName = sDirName.ToLower();
//Remove the slash
//sDirName = sDirName.Substring(1, sDirName.Length - 2);
try
{
//Open the Vdirs.dat to find out the list virtual directories
sr = new StreamReader("data\\VDirs.Dat");
while ((sLine = sr.ReadLine()) != null)
{
//Remove extra Spaces
sLine.Trim();
if (sLine.Length > 0)
{
//find the separator
iStartPos = sLine.IndexOf(";");
// Convert to lowercase
sLine = sLine.ToLower();
sVirtualDir = sLine.Substring(0,iStartPos);
sRealDir = sLine.Substring(iStartPos + 1);
if (sVirtualDir == sDirName)
{
break;
}
}
}
}
catch(Exception e)
{
Console.WriteLine("An Exception Occurred : " + e.ToString());
}
Console.WriteLine("Virtual Dir : " + sVirtualDir);
Console.WriteLine("Directory : " + sDirName);
Console.WriteLine("Physical Dir: " + sRealDir);
if (sVirtualDir == sDirName)
return sRealDir;
else
return "";
}
/// <summary>
/// This function send the Header Information to the client (Browser)
/// </summary>
/// <param name="sHttpVersion">HTTP Version</param>
/// <param name="sMIMEHeader">Mime Type</param>
/// <param name="iTotBytes">Total Bytes to be sent in the body</param>
/// <param name="mySocket">Socket reference</param>
/// <returns></returns>
public void SendHeader(string sHttpVersion, string sMIMEHeader, int iTotBytes, string sStatusCode, ref Socket mySocket)
{
String sBuffer = "";
// if Mime type is not provided set default to text/html
if (sMIMEHeader.Length == 0 )
{
sMIMEHeader = "text/html"; // Default Mime Type is text/html
}
sBuffer = sBuffer + sHttpVersion + sStatusCode + "\r\n";
sBuffer = sBuffer + "Server: cx1193719-b\r\n";
sBuffer = sBuffer + "Content-Type: " + sMIMEHeader + "\r\n";
sBuffer = sBuffer + "Accept-Ranges: bytes\r\n";
sBuffer = sBuffer + "Content-Length: " + iTotBytes + "\r\n\r\n";
Byte[] bSendData = Encoding.ASCII.GetBytes(sBuffer);
SendToBrowser( bSendData, ref mySocket);
Console.WriteLine("Total Bytes : " + iTotBytes.ToString());
}
/// <summary>
/// Overloaded Function, takes string, convert to bytes and calls
/// overloaded sendToBrowserFunction.
/// </summary>
/// <param name="sData">The data to be sent to the browser(client)</param>
/// <param name="mySocket">Socket reference</param>
public void SendToBrowser(String sData, ref Socket mySocket)
{
SendToBrowser (Encoding.ASCII.GetBytes(sData), ref mySocket);
}
/// <summary>
/// Sends data to the browser (client)
/// </summary>
/// <param name="bSendData">Byte Array</param>
/// <param name="mySocket">Socket reference</param>
public void SendToBrowser(Byte[] bSendData, ref Socket mySocket)
{
int numBytes = 0;
try
{
if (mySocket.Connected)
{
if (( numBytes = mySocket.Send(bSendData, bSendData.Length,0)) == -1)
Console.WriteLine("Socket Error cannot Send Packet");
else
{
Console.WriteLine("No. of bytes send {0}" , numBytes);
}
}
else
Console.WriteLine("Connection Dropped....");
}
catch (Exception e)
{
Console.WriteLine("Error Occurred : {0} ", e );
}
}
// Application Starts Here..
public static void Main()
{
MyWebServer MWS = new MyWebServer();
}
//This method Accepts new connection and
//First it receives the welcome massage from the client,
//Then it sends the Current date time to the Client.
public void StartListen()
{
int iStartPos = 0;
String sRequest;
String sDirName;
String sRequestedFile;
String sErrorMessage;
String sLocalDir;
String sMyWebServerRoot = "C:\\MyWebServerRoot\\";
String sPhysicalFilePath = "";
String sFormattedMessage = "";
String sResponse = "";
while(true)
{
//Accept a new connection
Socket mySocket = myListener.AcceptSocket() ;
Console.WriteLine ("Socket Type " + mySocket.SocketType );
if(mySocket.Connected)
{
Console.WriteLine("\nClient Connected!!\n==================\nCLient IP {0}\n",
mySocket.RemoteEndPoint) ;
//make a byte array and receive data from the client
Byte[] bReceive = new Byte[1024] ;
int i = mySocket.Receive(bReceive,bReceive.Length,0) ;
//Convert Byte to String
string sBuffer = Encoding.ASCII.GetString(bReceive);
//At present we will only deal with GET type
if (sBuffer.Substring(0,3) != "GET" )
{
Console.WriteLine("Only Get Method is supported..");
mySocket.Close();
return;
}
// Look for HTTP request
iStartPos = sBuffer.IndexOf("HTTP",1);
// Get the HTTP text and version e.g. it will return "HTTP/1.1"
string sHttpVersion = sBuffer.Substring(iStartPos,8);
// Extract the Requested Type and Requested file/directory
sRequest = sBuffer.Substring(0,iStartPos - 1);
//Replace backslash with Forward Slash, if Any
sRequest.Replace("file://\\","/");
//If file name is not supplied add forward slash to indicate
//that it is a directory and then we will look for the
//default file name..
if ((sRequest.IndexOf(".") <1) && (!sRequest.EndsWith("/")))
{
sRequest = sRequest + "/";
}
//Extract the requested file name
iStartPos = sRequest.LastIndexOf("/") + 1;
sRequestedFile = sRequest.Substring(iStartPos);
//Extract The directory Name
sDirName = sRequest.Substring(sRequest.IndexOf("/"), sRequest.LastIndexOf("/")-3);
/////////////////////////////////////////////////////////////////////
// Identify the Physical Directory
/////////////////////////////////////////////////////////////////////
if ( sDirName == "/")
sLocalDir = sMyWebServerRoot;
else
{
//Get the Virtual Directory
sLocalDir = GetLocalPath(sMyWebServerRoot, sDirName);
}
Console.WriteLine("Directory Requested : " + sLocalDir);
//If the physical directory does not exists then
// dispaly the error message
if (sLocalDir.Length == 0 )
{
sErrorMessage = "<H2>Error!! Requested Directory does not exists</H2><Br>";
//sErrorMessage = sErrorMessage + "Please check data\\Vdirs.Dat";
//Format The Message
SendHeader(sHttpVersion, "", sErrorMessage.Length, " 404 Not Found", ref mySocket);
//Send to the browser
SendToBrowser(sErrorMessage, ref mySocket);
mySocket.Close();
continue;
}
/////////////////////////////////////////////////////////////////////
// Identify the File Name
/////////////////////////////////////////////////////////////////////
//If The file name is not supplied then look in the default file list
if (sRequestedFile.Length == 0 )
{
// Get the default filename
sRequestedFile = GetTheDefaultFileName(sLocalDir);
if (sRequestedFile == "")
{
sErrorMessage = "<H2>Error!! No Default File Name Specified</H2>";
SendHeader(sHttpVersion, "", sErrorMessage.Length, " 404 Not Found", ref mySocket);
SendToBrowser ( sErrorMessage, ref mySocket);
mySocket.Close();
return;
}
}
/////////////////////////////////////////////////////////////////////
// Get TheMime Type
/////////////////////////////////////////////////////////////////////
String sMimeType = GetMimeType(sRequestedFile);
//Build the physical path
sPhysicalFilePath = sLocalDir + sRequestedFile;
Console.WriteLine("File Requested : " + sPhysicalFilePath);
if (File.Exists(sPhysicalFilePath) == false)
{
sErrorMessage = "<H2>404 Error! File Does Not Exists...</H2>";
SendHeader(sHttpVersion, "", sErrorMessage.Length, " 404 Not Found", ref mySocket);
SendToBrowser( sErrorMessage, ref mySocket);
Console.WriteLine(sFormattedMessage);
}
else
{
int iTotBytes=0;
sResponse ="";
FileStream fs = new FileStream(sPhysicalFilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
// Create a reader that can read bytes from the FileStream.
BinaryReader reader = new BinaryReader(fs);
byte[] bytes = new byte[fs.Length];
int read;
while((read = reader.Read(bytes, 0, bytes.Length)) != 0)
{
// Read from the file and write the data to the network
sResponse = sResponse + Encoding.ASCII.GetString(bytes,0,read);
iTotBytes = iTotBytes + read;
}
reader.Close();
fs.Close();
SendHeader(sHttpVersion, sMimeType, iTotBytes, " 200 OK", ref mySocket);
SendToBrowser(bytes, ref mySocket);
//mySocket.Send(bytes, bytes.Length,0);
}
mySocket.Close();
}
}
}
}
}