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//
// System.Web.Mail.SmtpStream.cs
//
// Author(s):
// Per Arneng <pt99par@student.bth.se>
//
//
using System;
using System.IO;
using System.Collections;
using System.Text;
using System.Security.Cryptography;
namespace System.Web.Mail {
internal class SmtpStream {
protected Stream stream;
protected Encoding encoding;
protected SmtpResponse lastResponse;
protected string command = "";
public SmtpStream( Stream stream ) {
this.stream = stream;
encoding = new ASCIIEncoding();
}
public Stream Stream {
get { return stream; }
}
public SmtpResponse LastResponse {
get { return lastResponse; }
}
public void WriteRset() {
command = "RSET";
WriteLine( command );
ReadResponse();
CheckForStatusCode( 250 );
}
public void WriteHelo( string hostName ) {
command = "HELO " + hostName;
WriteLine( command );
ReadResponse();
CheckForStatusCode( 250 );
}
public void WriteMailFrom( string from ) {
command = "MAIL FROM: <" + from + ">";
WriteLine( command );
ReadResponse();
CheckForStatusCode( 250 );
}
public void WriteRcptTo( string to ) {
command = "RCPT TO: <" + to + ">";
WriteLine( command );
ReadResponse();
CheckForStatusCode( 250 );
}
public void WriteData() {
command = "DATA";
WriteLine( command );
ReadResponse();
CheckForStatusCode( 354 );
}
public void WriteQuit() {
command = "QUIT";
WriteLine( command );
ReadResponse();
CheckForStatusCode( 221 );
}
public void WriteBoundary( string boundary ) {
WriteLine( "\r\n--{0}" , boundary );
}
public void WriteFinalBoundary( string boundary ) {
WriteLine( "\r\n--{0}--" , boundary );
}
// single dot by itself
public void WriteDataEndTag() {
command = "\r\n.";
WriteLine( command );
ReadResponse();
CheckForStatusCode( 250 );
}
public void WriteHeader( MailHeader header ) {
// write the headers
foreach( string key in header.Data.AllKeys )
WriteLine( "{0}: {1}" , key , header.Data[ key ] );
// write the header end tag
WriteLine( "" );
}
public void CheckForStatusCode( int statusCode ) {
if( LastResponse.StatusCode != statusCode ) {
string msg = "" +
"Server reponse: '" + lastResponse.RawResponse + "';" +
"Status code: '" + lastResponse.StatusCode + "';" +
"Expected status code: '" + statusCode + "';" +
"Last command: '" + command + "'";
throw new SmtpException( msg );
}
}
// write buffer's bytes to the stream
public void WriteBytes( byte[] buffer ) {
stream.Write( buffer , 0 , buffer.Length );
}
// writes a formatted line to the server
public void WriteLine( string format , params object[] args ) {
WriteLine( String.Format( format , args ) );
}
// writes a line to the server
public void WriteLine( string line ) {
byte[] buffer = encoding.GetBytes( line + "\r\n" );
stream.Write( buffer , 0 , buffer.Length );
#if DEBUG
DebugPrint( line );
#endif
}
// read a line from the server
public void ReadResponse( ) {
string line = null;
byte[] buffer = new byte[ 4096 ];
int readLength = stream.Read( buffer , 0 , buffer.Length );
if( readLength > 0 ) {
line = encoding.GetString( buffer , 0 , readLength );
line = line.TrimEnd( new Char[] { '\r' , '\n' , ' ' } );
}
// parse the line to the lastResponse object
lastResponse = SmtpResponse.Parse( line );
#if DEBUG
DebugPrint( line );
#endif
}
/// debug printing
private void DebugPrint( string line ) {
Console.WriteLine( "smtp: {0}" , line );
}
}
}
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