/// <summary>
/// Is called when email domain target servers resolve operation has completed.
/// </summary>
/// <param name="to">RCPT TO: address.</param>
/// <param name="op">Asynchronous operation.</param>
/// <exception cref="ArgumentNullException">Is raised when <b>to</b> or <b>op</b> is null reference.</exception>
private void EmailHostsResolveCompleted(string to, Dns_Client.GetEmailHostsAsyncOP op)
{
if (to == null)
{
throw new ArgumentNullException("to");
}
if (op == null)
{
throw new ArgumentNullException("op");
}
if (op.Error != null)
{
LogText("Failed to resolve email domain for email address '" + to + "' with error: " + op.Error.Message + ".");
Dispose(op.Error);
}
else
{
StringBuilder buf = new StringBuilder();
foreach (HostEntry host in op.Hosts)
{
foreach (IPAddress ip in host.Addresses)
{
m_pTargets.Add(new Relay_Target(host.HostName, new IPEndPoint(ip, 25)));
}
buf.Append(host.HostName + " ");
}
LogText("Resolved to following email hosts: (" + buf.ToString().TrimEnd() + ").");
BeginConnect();
}
op.Dispose();
}
/// <summary>
/// Start processing relay message.
/// </summary>
/// <param name="state">User data.</param>
internal void Start(object state)
{
try
{
if (m_pServer.Logger != null)
{
m_pSmtpClient.Logger = new Logger();
m_pSmtpClient.Logger.WriteLog += new EventHandler <WriteLogEventArgs>(SmtpClient_WriteLog);
}
LogText("Starting to relay message '" + m_pRelayItem.MessageID + "' from '" + m_pRelayItem.From + "' to '" + m_pRelayItem.To + "'.");
// Resolve email target hosts.
if (m_RelayMode == Relay_Mode.Dns)
{
Dns_Client.GetEmailHostsAsyncOP op = new Dns_Client.GetEmailHostsAsyncOP(m_pRelayItem.To);
op.CompletedAsync += delegate(object s1, EventArgs <Dns_Client.GetEmailHostsAsyncOP> e1)
{
EmailHostsResolveCompleted(m_pRelayItem.To, op);
};
if (!m_pServer.DnsClient.GetEmailHostsAsync(op))
{
EmailHostsResolveCompleted(m_pRelayItem.To, op);
}
}
// Resolve smart hosts IP addresses.
else if (m_RelayMode == Relay_Mode.SmartHost)
{
string[] smartHosts = new string[m_pSmartHosts.Length];
for (int i = 0; i < m_pSmartHosts.Length; i++)
{
smartHosts[i] = m_pSmartHosts[i].Host;
}
Dns_Client.GetHostsAddressesAsyncOP op = new Dns_Client.GetHostsAddressesAsyncOP(smartHosts);
op.CompletedAsync += delegate(object s1, EventArgs <Dns_Client.GetHostsAddressesAsyncOP> e1)
{
SmartHostsResolveCompleted(op);
};
if (!m_pServer.DnsClient.GetHostsAddressesAsync(op))
{
SmartHostsResolveCompleted(op);
}
}
}
catch (Exception x)
{
Dispose(x);
}
}
