/// <summary>
/// Connects to specified NNTP server.
/// </summary>
/// <param name="server">NNTP server.</param>
/// <param name="port">NNTP server port. Defualt NNTP port is 119.</param>
public void Connect(string server,int port)
{
if(m_Connected){
throw new Exception("NNTP client is already connected, Disconnect first before calling Connect !");
}
m_pSocket = new SocketEx();
m_pSocket.Connect(server,port);
/*
if(m_LogCmds && SessionLog != null){
m_pLogger = new SocketLogger(s,SessionLog);
m_pLogger.SessionID = Guid.NewGuid().ToString();
m_pSocket.Logger = m_pLogger;
}*/
// Set connected flag
m_Connected = true;
// Read server response
string responseLine = m_pSocket.ReadLine(1000);
if(!responseLine.StartsWith("200")){
throw new Exception(responseLine);
}
}
/// <summary>
/// Connects to specified host.
/// </summary>
/// <param name="host">Host name.</param>
/// <param name="port">Port.</param>
public void Connect(string host,int port)
{
m_pSocket = new SocketEx();
m_pSocket.Connect(host,port);
string reply = m_pSocket.ReadLine();
while(!reply.StartsWith("220 ")){
reply = m_pSocket.ReadLine();
}
m_Connected = true;
}
/// <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>
/// <param name="ssl">Specifies if to connected via SSL. Default SMTP port is 25 and SSL port is 465.</param>
public void Connect(IPEndPoint localEndpoint, string host, int port, bool ssl)
{
m_pSocket = new SocketEx();
if (localEndpoint != null)
{
m_pSocket.Bind(localEndpoint);
}
// Create logger
if (SessionLog != null)
{
m_pLogger = new SocketLogger(m_pSocket.RawSocket, SessionLog);
m_pLogger.SessionID = Guid.NewGuid().ToString();
m_pSocket.Logger = m_pLogger;
}
if (host.IndexOf("@") == -1)
{
m_pSocket.Connect(host, port, ssl);
}
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);
bool connected = false;
switch (dnsResponse.ResponseCode)
{
case RCODE.NO_ERROR:
DNS_rr_MX[] mxRecords = dnsResponse.GetMXRecords();
// Try all available hosts by MX preference order, if can't connect specified host.
foreach (DNS_rr_MX mx in mxRecords)
{
try
{
if (m_pLogger != null)
{
m_pLogger.AddTextEntry("Connecting with mx record to: " + mx.Host);
}
m_pSocket.Connect(mx.Host, port, ssl);
connected = true;
break;
}
catch (Exception x)
{
// Just skip and let for to try next host.
if (m_pLogger != null)
{
m_pLogger.AddTextEntry("Failed connect to: " + mx.Host + " error:" +
x.Message);
}
}
}
// None of MX didn't connect
if (mxRecords.Length > 0 && !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 (!connected)
{
// 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(domain, port, ssl);
}
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>
/// Connects to IMAP server.
/// </summary>
/// <param name="host">Host name.</param>
/// <param name="port">Port number. Default IMAP port is 143 and SSL port is 993.</param>
/// <param name="ssl">Specifies if to connected via SSL.</param>
public void Connect(string host,int port,bool ssl)
{
if(!m_Connected){
m_pSocket = new SocketEx();
m_pSocket.Connect(host,port,ssl);
string reply = m_pSocket.ReadLine();
reply = reply.Substring(reply.IndexOf(" ")).Trim(); // Remove Cmd tag
if(!reply.ToUpper().StartsWith("OK")){
m_pSocket.Disconnect();
m_pSocket = null;
throw new Exception("Server returned:" + reply);
}
m_Connected = true;
// Clear path separator, so next access will get it.
m_PathSeparator = '\0';
}
}