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//
// System.Net.Mail.SmtpClient.cs
//
// Author:
// Tim Coleman (tim@timcoleman.com)
//
// Copyright (C) Tim Coleman, 2004
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#if NET_2_0
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Net;
using System.Net.Mime;
using System.Net.Sockets;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading;
namespace System.Net.Mail {
public class SmtpClient
{
#region Fields
string host;
int port;
int timeout = 100000;
ICredentialsByHost credentials;
bool useDefaultCredentials;
string pickupDirectoryLocation;
SmtpDeliveryMethod deliveryMethod;
bool enableSsl;
X509CertificateCollection clientCertificates;
TcpClient client;
NetworkStream stream;
StreamWriter writer;
StreamReader reader;
int boundaryIndex;
Mutex mutex = new Mutex ();
const string MimeVersion = "1.0 (produced by Mono System.Net.Mail.SmtpClient)";
#endregion // Fields
#region Constructors
public SmtpClient ()
: this (null, 0)
{
}
public SmtpClient (string host)
: this (host, 0)
{
}
[MonoTODO ("Load default settings from configuration.")]
public SmtpClient (string host, int port)
{
// FIXME: load from configuration
if (String.IsNullOrEmpty (host))
Host = "127.0.0.1";
else
Host = host;
// FIXME: load from configuration
if (port == 0)
Port = 25;
else
Port = port;
// FIXME: load credentials from configuration
}
#endregion // Constructors
#region Properties
[MonoTODO]
public X509CertificateCollection ClientCertificates {
get { return clientCertificates; }
}
public ICredentialsByHost Credentials {
get { return credentials; }
set { credentials = value; }
}
public SmtpDeliveryMethod DeliveryMethod {
get { return deliveryMethod; }
set { deliveryMethod = value; }
}
public bool EnableSsl {
get { return enableSsl; }
set { enableSsl = value; }
}
public string Host {
get { return host; }
[MonoTODO ("Check to make sure an email is not being sent.")]
set {
if (value == null)
throw new ArgumentNullException ();
if (value.Length == 0)
throw new ArgumentException ();
host = value;
}
}
public string PickupDirectoryLocation {
get { return pickupDirectoryLocation; }
set { pickupDirectoryLocation = value; }
}
public int Port {
get { return port; }
[MonoTODO ("Check to make sure an email is not being sent.")]
set {
if (value <= 0)
throw new ArgumentOutOfRangeException ();
port = value;
}
}
[MonoTODO]
public ServicePoint ServicePoint {
get { throw new NotImplementedException (); }
}
public int Timeout {
get { return timeout; }
[MonoTODO ("Check to make sure an email is not being sent.")]
set {
if (value < 0)
throw new ArgumentOutOfRangeException ();
timeout = value;
}
}
[MonoTODO]
public bool UseDefaultCredentials {
get { return useDefaultCredentials; }
set { useDefaultCredentials = value; }
}
#endregion // Properties
#region Events
public event SendCompletedEventHandler SendCompleted;
#endregion // Events
#region Methods
private void EndSection (string section)
{
SendData (String.Format ("--{0}--", section));
}
private string GenerateBoundary ()
{
string output = GenerateBoundary (boundaryIndex);
boundaryIndex += 1;
return output;
}
private static string GenerateBoundary (int index)
{
return String.Format ("--boundary_{0}_{1}", index, Guid.NewGuid ().ToString ("D"));
}
private bool IsError (SmtpResponse status)
{
return ((int) status.StatusCode) >= 400;
}
protected void OnSendCompleted (AsyncCompletedEventArgs e)
{
if (SendCompleted != null)
SendCompleted (this, e);
}
private SmtpResponse Read ()
{
SmtpResponse response;
char[] buf = new char [3];
reader.Read (buf, 0, 3);
reader.Read ();
response.StatusCode = (SmtpStatusCode) Int32.Parse (new String (buf));
response.Description = reader.ReadLine ();
return response;
}
[MonoTODO ("Need to work on message attachments.")]
public void Send (MailMessage message)
{
// Block while sending
mutex.WaitOne ();
SmtpResponse status;
client = new TcpClient (host, port);
stream = client.GetStream ();
writer = new StreamWriter (stream);
reader = new StreamReader (stream);
boundaryIndex = 0;
string boundary = GenerateBoundary ();
bool hasAlternateViews = (message.AlternateViews.Count > 0);
bool hasAttachments = (message.Attachments.Count > 0);
status = Read ();
if (IsError (status))
throw new SmtpException (status.StatusCode);
// HELO
status = SendCommand (Command.Helo, Dns.GetHostName ());
if (IsError (status))
throw new SmtpException (status.StatusCode);
// MAIL FROM:
status = SendCommand (Command.MailFrom, message.From.Address);
if (IsError (status))
throw new SmtpException (status.StatusCode);
// Send RCPT TO: for all recipients
List<SmtpFailedRecipientException> sfre = new List<SmtpFailedRecipientException> ();
for (int i = 0; i < message.To.Count; i ++) {
status = SendCommand (Command.RcptTo, message.To [i].Address);
if (IsError (status))
sfre.Add (new SmtpFailedRecipientException (status.StatusCode, message.To [i].Address.ToString ()));
}
for (int i = 0; i < message.CC.Count; i ++) {
status = SendCommand (Command.RcptTo, message.CC [i].Address);
if (IsError (status))
sfre.Add (new SmtpFailedRecipientException (status.StatusCode, message.CC [i].Address.ToString ()));
}
for (int i = 0; i < message.Bcc.Count; i ++) {
status = SendCommand (Command.RcptTo, message.Bcc [i].Address);
if (IsError (status))
sfre.Add (new SmtpFailedRecipientException (status.StatusCode, message.Bcc [i].Address.ToString ()));
}
if (sfre.Count > 0)
throw new SmtpFailedRecipientsException ("failed recipients", sfre.ToArray ());
// DATA
status = SendCommand (Command.Data);
if (IsError (status))
throw new SmtpException (status.StatusCode);
// Figure out the message content type
ContentType messageContentType = message.BodyContentType;
if (hasAttachments || hasAlternateViews) {
messageContentType.Boundary = boundary;
if (hasAttachments)
messageContentType.MediaType = "multipart/mixed";
else
messageContentType.MediaType = "multipart/alternative";
}
// Send message headers
SendHeader (HeaderName.From, message.From.ToString ());
SendHeader (HeaderName.To, message.To.ToString ());
if (message.CC.Count > 0)
SendHeader (HeaderName.Cc, message.CC.ToString ());
if (message.Bcc.Count > 0)
SendHeader (HeaderName.Bcc, message.Bcc.ToString ());
SendHeader (HeaderName.Subject, message.Subject);
foreach (string s in message.Headers.AllKeys)
SendHeader (s, message.Headers [s]);
SendHeader ("Content-Type", messageContentType.ToString ());
SendData ("");
if (hasAlternateViews) {
string innerBoundary = boundary;
// The body is *technically* an alternative view. The body text goes FIRST because
// that is most compatible with non-MIME readers.
//
// If there are attachments, then the main content-type is multipart/mixed and
// the subpart has type multipart/alternative. Then all of the views have their
// own types.
//
// If there are no attachments, then the main content-type is multipart/alternative
// and we don't need this subpart.
if (hasAttachments) {
innerBoundary = GenerateBoundary ();
ContentType contentType = new ContentType ("multipart/alternative");
contentType.Boundary = innerBoundary;
StartSection (boundary, contentType);
}
// Start the section for the body text. This is either section "1" or "0" depending
// on whether there are attachments.
StartSection (innerBoundary, messageContentType, TransferEncoding.QuotedPrintable);
SendData (message.Body);
// Send message attachments.
SendAttachments (message.Attachments, innerBoundary);
if (hasAttachments)
EndSection (innerBoundary);
}
else {
// If this is multipart then we need to send a boundary before the body.
if (hasAttachments) {
// FIXME: check this
ContentType contentType = new ContentType ("multipart/alternative");
StartSection (boundary, contentType, TransferEncoding.QuotedPrintable);
}
SendData (message.Body);
}
// Send attachments
if (hasAttachments) {
string innerBoundary = boundary;
// If we have alternate views and attachments then we need to nest this part inside another
// boundary. Otherwise, we are cool with the boundary we have.
if (hasAlternateViews) {
innerBoundary = GenerateBoundary ();
ContentType contentType = new ContentType ("multipart/mixed");
contentType.Boundary = innerBoundary;
StartSection (boundary, contentType);
}
SendAttachments (message.Attachments, innerBoundary);
if (hasAlternateViews)
EndSection (innerBoundary);
}
SendData (".");
status = Read ();
if (IsError (status))
throw new SmtpException (status.StatusCode);
status = SendCommand (Command.Quit);
writer.Close ();
reader.Close ();
stream.Close ();
client.Close ();
// Release the mutex to allow other threads access
mutex.ReleaseMutex ();
}
public void Send (string from, string to, string subject, string body)
{
Send (new MailMessage (from, to, subject, body));
}
private void SendData (string data)
{
writer.WriteLine (data);
writer.Flush ();
}
[MonoTODO]
public void SendAsync (MailMessage message, object userToken)
{
Send (message);
OnSendCompleted (new AsyncCompletedEventArgs (null, false, userToken));
}
public void SendAsync (string from, string to, string subject, string body, object userToken)
{
SendAsync (new MailMessage (from, to, subject, body), userToken);
}
[MonoTODO]
public void SendAsyncCancel ()
{
throw new NotImplementedException ();
}
private void SendAttachments (AttachmentCollection attachments, string boundary)
{
for (int i = 0; i < attachments.Count; i += 1) {
// FIXME: check this
ContentType contentType = new ContentType ("multipart/alternative");
StartSection (boundary, contentType, attachments [i].TransferEncoding);
switch (attachments [i].TransferEncoding) {
case TransferEncoding.Base64:
byte[] content = new byte [attachments [i].ContentStream.Length];
attachments [i].ContentStream.Read (content, 0, content.Length);
SendData (Convert.ToBase64String (content, Base64FormattingOptions.InsertLineBreaks));
break;
case TransferEncoding.QuotedPrintable:
StreamReader sr = new StreamReader (attachments [i].ContentStream);
SendData (ToQuotedPrintable (sr.ReadToEnd ()));
break;
//case TransferEncoding.SevenBit:
//case TransferEncoding.Unknown:
default:
SendData ("TO BE IMPLEMENTED");
break;
}
}
}
private SmtpResponse SendCommand (string command, string data)
{
writer.Write (command);
writer.Write (" ");
SendData (data);
return Read ();
}
private SmtpResponse SendCommand (string command)
{
writer.WriteLine (command);
writer.Flush ();
return Read ();
}
private void SendHeader (string name, string value)
{
SendData (String.Format ("{0}: {1}", name, value));
}
private void StartSection (string section, ContentType sectionContentType)
{
SendData (String.Format ("--{0}", section));
SendHeader ("content-type", sectionContentType.ToString ());
SendData ("");
}
private void StartSection (string section, ContentType sectionContentType,TransferEncoding transferEncoding)
{
SendData (String.Format ("--{0}", section));
SendHeader ("content-type", sectionContentType.ToString ());
SendHeader ("content-transfer-encoding", GetTransferEncodingName (transferEncoding));
SendData ("");
}
private string ToQuotedPrintable (string input)
{
StringReader reader = new StringReader (input);
StringWriter writer = new StringWriter ();
int i;
while ((i = reader.Read ()) > 0) {
if (i > 127) {
writer.Write ("=");
writer.Write (Convert.ToString (i, 16).ToUpper ());
}
else
writer.Write (Convert.ToChar (i));
}
return writer.GetStringBuilder ().ToString ();
}
private static string GetTransferEncodingName (TransferEncoding encoding)
{
switch (encoding) {
case TransferEncoding.QuotedPrintable:
return "quoted-printable";
case TransferEncoding.SevenBit:
return "7bit";
case TransferEncoding.Base64:
return "base64";
}
return "unknown";
}
/*
[MonoTODO]
private sealed ContextAwareResult IGetContextAwareResult.GetContextAwareResult ()
{
throw new NotImplementedException ();
}
*/
#endregion // Methods
// The Command struct is used to store constant string values representing SMTP commands.
private struct Command {
public const string Data = "DATA";
public const string Helo = "HELO";
public const string MailFrom = "MAIL FROM:";
public const string Quit = "QUIT";
public const string RcptTo = "RCPT TO:";
}
// The HeaderName struct is used to store constant string values representing mail headers.
private struct HeaderName {
public const string ContentTransferEncoding = "Content-Transfer-Encoding";
public const string ContentType = "Content-Type";
public const string Bcc = "Bcc";
public const string Cc = "Cc";
public const string From = "From";
public const string Subject = "Subject";
public const string To = "To";
public const string MimeVersion = "MIME-Version";
public const string MessageId = "Message-ID";
}
// This object encapsulates the status code and description of an SMTP response.
private struct SmtpResponse {
public SmtpStatusCode StatusCode;
public string Description;
}
}
}
#endif // NET_2_0
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