/// <summary>
/// Default constructor.
/// </summary>
/// <param name="clientSocket">Referance to socket.</param>
/// <param name="server">Referance to FTP server.</param>
/// <param name="sessionID">Session ID which is assigned to this session.</param>
/// <param name="logWriter">Log writer.</param>
public FTP_Session(Socket clientSocket,FTP_Server server,string sessionID,SocketLogger logWriter)
{
m_pSocket = new BufferedSocket(clientSocket);
m_pServer = server;
m_SessionID = sessionID;
// m_pLogWriter = logWriter;
m_SessionStartTime = DateTime.Now;
m_LastDataTime = DateTime.Now;
m_pSocket.SetSocketOption(SocketOptionLevel.Socket,SocketOptionName.NoDelay,1);
m_pSocket.Activity += new EventHandler(OnSocketActivity);
// Start session proccessing
StartSession();
}
/// <summary>
/// Default constructor.
/// </summary>
/// <param name="clientSocket">Referance to socket.</param>
/// <param name="server">Referance to IMAP server.</param>
/// <param name="logWriter">Log writer.</param>
internal IMAP_Session(Socket clientSocket,IMAP_Server server,SocketLogger logWriter)
{
m_pSocket = new BufferedSocket(clientSocket);
m_pServer = server;
m_SessionID = Guid.NewGuid().ToString();
m_SessionStartTime = DateTime.Now;
m_LastDataTime = DateTime.Now;
if(m_pServer.LogCommands){
m_pSocket.Logger = logWriter;
m_pSocket.Logger.SessionID = m_SessionID;
}
m_pSocket.SetSocketOption(SocketOptionLevel.Socket,SocketOptionName.NoDelay,1);
m_pSocket.Activity += new EventHandler(OnSocketActivity);
// Start session proccessing
StartSession();
}
/// <summary>
/// Default constructor.
/// </summary>
/// <param name="clientSocket">Referance to socket.</param>
/// <param name="server">Referance to SMTP server.</param>
/// <param name="logWriter">Log writer.</param>
internal SMTP_Session(Socket clientSocket,SMTP_Server server,SocketLogger logWriter)
{
m_pSocket = new BufferedSocket(clientSocket);
m_pServer = server;
m_pMsgStream = new MemoryStream();
m_SessionID = Guid.NewGuid().ToString();
m_BodyType = BodyType.x7_bit;
m_Forward_path = new Hashtable();
m_CmdValidator = new SMTP_Cmd_Validator();
m_SessionStart = DateTime.Now;
m_LastDataTime = DateTime.Now;
if(m_pServer.LogCommands){
m_pSocket.Logger = logWriter;
m_pSocket.Logger.SessionID = m_SessionID;
}
m_pSocket.SetSocketOption(SocketOptionLevel.Socket,SocketOptionName.NoDelay,1);
m_pSocket.Activity += new EventHandler(OnSocketActivity);
// Start session proccessing
StartSession();
}
/// <summary>
/// Connects to sepcified host.
/// </summary>
/// <param name="localEndpoint">Sets local endpoint. Pass null, to use default.</param>
/// <param name="host">Host name or IP address.</param>
/// <param name="port">Port where to connect.</param>
public void Connect(IPEndPoint localEndpoint,string host,int port)
{
Socket s = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.IP);
s.SetSocketOption(SocketOptionLevel.Socket,SocketOptionName.ReceiveTimeout,30000);
s.SetSocketOption(SocketOptionLevel.Socket,SocketOptionName.NoDelay,1);
m_pSocket = new BufferedSocket(s);
if(localEndpoint != null){
m_pSocket.Bind(localEndpoint);
}
m_pSocket.Activity += new EventHandler(m_pSocket_Activity);
if(SessionLog != null){
m_pLogger = new SocketLogger(s,SessionLog);
m_pLogger.SessionID = Guid.NewGuid().ToString();
m_pSocket.Logger = m_pLogger;
}
if(host.IndexOf("@") == -1){
m_pSocket.Connect(new IPEndPoint(Dns_Client.Resolve(host)[0],port));
}
else{
//---- Parse e-domain -------------------------------//
string domain = host;
// eg. Ivx <*****@*****.**>
if(domain.IndexOf("<") > -1 && domain.IndexOf(">") > -1){
domain = domain.Substring(domain.IndexOf("<")+1,domain.IndexOf(">") - domain.IndexOf("<")-1);
}
if(domain.IndexOf("@") > -1){
domain = domain.Substring(domain.LastIndexOf("@") + 1);
}
if(domain.Trim().Length == 0){
if(m_pLogger != null){
m_pLogger.AddTextEntry("Destination address '" + host + "' is invalid, aborting !");
}
throw new Exception("Destination address '" + host + "' is invalid, aborting !");
}
//--- Get MX record -------------------------------------------//
Dns_Client dns = new Dns_Client();
Dns_Client.DnsServers = m_pDnsServers;
DnsServerResponse dnsResponse = dns.Query(domain,QTYPE.MX);
switch(dnsResponse.ResponseCode)
{
case RCODE.NO_ERROR:
MX_Record[] mxRecords = dnsResponse.GetMXRecords();
// Try all available hosts by MX preference order, if can't connect specified host.
foreach(MX_Record mx in mxRecords){
try{
if(m_pLogger != null){
m_pLogger.AddTextEntry("Connecting with mx record to: " + mx.Host);
}
m_pSocket.Connect(new IPEndPoint(Dns_Client.Resolve(mx.Host)[0],port));
break;
}
catch{ // Just skip and let for to try next host.
if(m_pLogger != null){
m_pLogger.AddTextEntry("Failed connect to: " + mx.Host);
}
}
}
// None of MX didn't connect
if(mxRecords.Length > 0 && !m_pSocket.Connected){
throw new Exception("Destination email server is down");
}
/* Rfc 2821 5
If no MX records are found, but an A RR is found, the A RR is treated as
if it was associated with an implicit MX RR, with a preference of 0,
pointing to that host.
*/
if(mxRecords.Length == 0){
// Try to connect with A record
IPAddress[] ipEntry = null;
try{
if(m_pLogger != null){
m_pLogger.AddTextEntry("No mx record, trying to get A record for: " + domain);
}
ipEntry = Dns_Client.Resolve(domain);
}
catch{
if(m_pLogger != null){
m_pLogger.AddTextEntry("Invalid domain,no MX or A record: " + domain);
}
throw new Exception("Invalid domain,no MX or A record: " + domain);
}
try{
if(m_pLogger != null){
m_pLogger.AddTextEntry("Connecting with A record to:" + domain);
}
m_pSocket.Connect(new IPEndPoint(ipEntry[0],port));
}
catch{
if(m_pLogger != null){
m_pLogger.AddTextEntry("Failed connect to:" + domain);
}
throw new Exception("Destination email server is down");
}
}
break;
case RCODE.NAME_ERROR:
if(m_pLogger != null){
m_pLogger.AddTextEntry("Invalid domain,no MX or A record: " + domain);
}
throw new Exception("Invalid domain,no MX or A record: " + domain);
case RCODE.SERVER_FAILURE:
if(m_pLogger != null){
m_pLogger.AddTextEntry("Dns server unvailable.");
}
throw new Exception("Dns server unvailable.");
}
}
/*
* Notes: Greeting may be single or multiline response.
*
* Examples:
* 220<SP>SMTP server ready<CRLF>
*
* 220-SMTP server ready<CRLF>
* 220-Addtitional text<CRLF>
* 220<SP>final row<CRLF>
*
*/
// Read server response
string responseLine = m_pSocket.ReadLine(1000);
while(!responseLine.StartsWith("220 ")){
// If lisne won't start with 220, then its error response
if(!responseLine.StartsWith("220")){
throw new Exception(responseLine);
}
responseLine = m_pSocket.ReadLine(1000);
}
m_Connected = true;
}
/* /// <summary>
/// Starts disconnecting SMTP client.
/// </summary>
public void BeginDisconnect()
{
if(!m_Connected){
throw new Exception("You must connect first");
}
}*/
#region method Disconnect
/// <summary>
/// Disconnects smtp client from server.
/// </summary>
public void Disconnect()
{
try{
if(m_pSocket != null && m_pSocket.Connected){
m_pSocket.SendLine("QUIT");
m_pSocket.Shutdown(SocketShutdown.Both);
}
}
catch{
}
m_pSocket = null;
m_Connected = false;
m_Supports_Size = false;
m_Supports_Bdat = false;
m_Supports_Login = false;
m_Supports_CramMd5 = false;
if(m_pLogger != null){
m_pLogger.Flush();
m_pLogger = null;
}
}
/// <summary>
/// Ends session, closes socket.
/// </summary>
private void EndSession()
{
try{
// Write logs to log file, if needed
if(m_pServer.LogCommands){
m_pSocket.Logger.Flush();
}
if(m_pSocket != null){
m_pSocket.Shutdown(SocketShutdown.Both);
m_pSocket.Close();
m_pSocket = null;
}
}
catch{ // We don't need to check errors here, because they only may be Socket closing errors.
}
finally{
m_pServer.RemoveSession(this);
}
}
/// <summary>
/// Closes connection to Pop33 server.
/// </summary>
public void Disconnect()
{
if (socketStream != null)
{
// Send QUIT
socketStream.Write(Encoding.ASCII.GetBytes("QUIT"), 0, 4);
socketStream.Close();
}
if (m_pLogger != null)
{
m_pLogger.Flush();
}
m_pLogger = null;
m_pSocket = null;
m_Connected = false;
m_Authenticated = false;
}
/// <summary>
/// Ends session, closes socket.
/// </summary>
private void EndSession()
{
m_pServer.RemoveSession(this);
// Write logs to log file, if needed
if(m_pServer.LogCommands){
// m_pLogWriter.AddEntry("//----- Sys: 'Session:'" + this.SessionID + " removed " + DateTime.Now);
// m_pLogWriter.Flush();
m_pSocket.Logger.Flush();
}
if(m_pSocket != null){
m_pSocket.Shutdown(SocketShutdown.Both);
m_pSocket.Close();
m_pSocket = null;
}
}