private void btCheckSettings_Click(object sender, EventArgs e)
{
Page.Validate();
if (!Page.IsValid)
{
return;
}
SecureConnectionType type = SecureConnectionType.None;
switch (rbSecurity.SelectedValue)
{
case "0":
type = SecureConnectionType.None;
break;
case "1":
type = SecureConnectionType.Ssl;
break;
case "2":
type = SecureConnectionType.Tls;
break;
default:
break;
}
string password = txtPassword.Text.Trim();
if (String.IsNullOrEmpty(password) && ViewState["Password"] != null)
{
password = ViewState["Password"].ToString();
}
SmtpSettingsResult result = SmtpBox.CheckSettings(txtServer.Text, int.Parse(txtPort.Text), type, cbAuthenticate.Checked, txtUser.Text, password);
lbSettingsValid.Visible = true;
if (result == SmtpSettingsResult.AllOk)
{
lbSettingsValid.ForeColor = Color.Blue;
lbSettingsValid.Text = LocRM.GetString("tOK");
}
else
{
lbSettingsValid.ForeColor = Color.Red;
lbSettingsValid.Text = LocRM.GetString("tError");
}
}
internal static SmtpSettingsResult CheckSettings(string SmtpServerHost, int Port,
SecureConnectionType SecureConnection,
bool Authenticate,
string User, string Password)
{
SmtpSettingsResult result = SmtpSettingsResult.None;
if (SmtpServerHost == string.Empty)
{
SmtpServerHost = "localhost";
}
try
{
// Progressive Method
//byte[] inBuffer = new byte[10 * 1024];
//int realReceived = -1;
string ResponseString = string.Empty;
// Step 1. Open Socket Connection
using (Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
{
#region Init Socket
//IPHostEntry entry = Dns.GetHostEntry(SmtpServerHost);
IPAddress address = GetHostAddressIPv4(SmtpServerHost);
result |= SmtpSettingsResult.ServerName;
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 30000);
socket.Connect(new IPEndPoint(address, Port));
#endregion
Stream smptStream = new NetworkStream(socket);
if (SecureConnection == SecureConnectionType.Ssl)
{
SslStream sslStream = new SslStream(smptStream, false,
new RemoteCertificateValidationCallback(ValidateServerCertificate), null);
sslStream.AuthenticateAsClient(SmtpServerHost);
smptStream = sslStream;
}
#region Welcome
// Step 2. Read Welcome
//realReceivet = socket.Receive(inByffer);
//realReceived = StreamRead(smptStream,inByffer);
//ResponseString = Encoding.Default.GetString(inByffer, 0, realReceived);
ResponseString = StreamReadString(smptStream);
System.Diagnostics.Trace.WriteLine(ResponseString);
switch (GetSmtpReplyCommand(ResponseString))
{
case 220:
// Success
break;
default:
throw new SmtpClientException(ResponseString);
}
#endregion
#region HELO
// Step 3. Send EHLO command
IPAddress[] ipList = Dns.GetHostEntry(Dns.GetHostName()).AddressList;
if (ipList.Length > 0)
{
//socket.Send(System.Text.Encoding.Default.GetBytes(string.Format("EHLO [{0}]\r\n", ipList[0].ToString())));
StreamWrite(smptStream, "EHLO [{0}]\r\n", ipList[0].ToString());
}
else
{
//socket.Send(System.Text.Encoding.Default.GetBytes("EHLO\r\n"));
StreamWrite(smptStream, "EHLO\r\n");
}
// Step 4. Read Response
//realReceivet = socket.Receive(inByffer);
//realReceived = StreamRead(smptStream, inByffer);
//ResponseString = Encoding.Default.GetString(inByffer, 0, realReceived);
ResponseString = StreamReadString(smptStream);
System.Diagnostics.Trace.WriteLine(ResponseString);
switch (GetSmtpReplyCommand(ResponseString))
{
case 250:
// Success
break;
default:
throw new SmtpClientException(ResponseString);
}
#endregion
if (SecureConnection == SecureConnectionType.Tls)
{
#region STARTTLS
// Step. Send STARTTLS command
StreamWrite(smptStream, "STARTTLS\r\n");
//realReceived = StreamRead(smptStream, inByffer);
// Step. Read Response
//ResponseString = Encoding.Default.GetString(inByffer, 0, realReceived);
ResponseString = StreamReadString(smptStream);
System.Diagnostics.Trace.WriteLine(ResponseString);
switch (GetSmtpReplyCommand(ResponseString))
{
case 220:
// Success
break;
default:
throw new SmtpClientException(ResponseString);
}
SslStream tlsSmtpStream = new SslStream(smptStream, false,
new RemoteCertificateValidationCallback(ValidateServerCertificate),
null);
tlsSmtpStream.AuthenticateAsClient(SmtpServerHost);
smptStream = tlsSmtpStream;
#endregion
}
result |= SmtpSettingsResult.Connection;
if (Authenticate)
{
#region AUTH LOGIN
//socket.Send(System.Text.Encoding.Default.GetBytes("AUTH LOGIN\r\n"));
StreamWrite(smptStream, "AUTH LOGIN\r\n");
// Step 4. Read Response
//realReceivet = socket.Receive(inByffer);
//realReceived = StreamRead(smptStream, inByffer);
//ResponseString = Encoding.Default.GetString(inByffer, 0, realReceived);
ResponseString = StreamReadString(smptStream);
System.Diagnostics.Trace.WriteLine(ResponseString);
switch (GetSmtpReplyCommand(ResponseString))
{
case 334:
// Success
break;
default:
throw new SmtpClientException(ResponseString);
}
// Send User Name
string UserNameB64 = Convert.ToBase64String(Encoding.Default.GetBytes(User)) + "\r\n";
//socket.Send(System.Text.Encoding.Default.GetBytes(UserNameB64));
StreamWrite(smptStream, UserNameB64);
// Step 4. Read Response
//realReceivet = socket.Receive(inByffer);
//realReceived = StreamRead(smptStream, inByffer);
//ResponseString = Encoding.Default.GetString(inByffer, 0, realReceived);
ResponseString = StreamReadString(smptStream);
System.Diagnostics.Trace.WriteLine(ResponseString);
switch (GetSmtpReplyCommand(ResponseString))
{
case 334:
// Success
break;
default:
throw new SmtpClientException(ResponseString);
}
// Send Password
string PassB64 = Convert.ToBase64String(Encoding.Default.GetBytes(Password)) + "\r\n";
//socket.Send(System.Text.Encoding.Default.GetBytes(PassB64));
StreamWrite(smptStream, PassB64);
// Step 4. Read Response
//realReceivet = socket.Receive(inByffer);
//realReceived = StreamRead(smptStream, inByffer);
//ResponseString = Encoding.Default.GetString(inByffer, 0, realReceived);
ResponseString = StreamReadString(smptStream);
System.Diagnostics.Trace.WriteLine(ResponseString);
switch (GetSmtpReplyCommand(ResponseString))
{
case 235:
// Success
break;
default:
throw new SmtpClientException(ResponseString);
}
#endregion
}
result |= SmtpSettingsResult.Authentication;
#region QUIT
// Step 14. Send QUIT command
//socket.Send(System.Text.Encoding.Default.GetBytes("QUIT\r\n"));
StreamWrite(smptStream, "QUIT\r\n");
// Step 15. Close Connection
//realReceivet = socket.Receive(inByffer);
//realReceived = StreamRead(smptStream, inByffer);
//ResponseString = Encoding.Default.GetString(inByffer, 0, realReceived);
ResponseString = StreamReadString(smptStream);
System.Diagnostics.Trace.WriteLine(ResponseString);
switch (GetSmtpReplyCommand(ResponseString))
{
case 221:
// Success
break;
default:
throw new SmtpClientException(ResponseString);
}
#endregion
socket.Close();
}
}
catch (Exception ex)
{
System.Diagnostics.Trace.WriteLine(ex, "SmtpClient.CheckSetting");
}
return(result);
}