/// <summary>
/// Smart host relay session constructor.
/// </summary>
/// <param name="server">Owner relay server.</param>
/// <param name="localBindInfo">Local bind info.</param>
/// <param name="realyItem">Relay item.</param>
/// <param name="smartHosts">Smart hosts.</param>
/// <exception cref="ArgumentNullException">Is raised when <b>server</b>,<b>localBindInfo</b>,<b>realyItem</b> or <b>smartHosts</b>is null.</exception>
/// <exception cref="ArgumentException">Is raised when any of the arguments has invalid value.</exception>
internal Relay_Session(Relay_Server server,
IPBindInfo localBindInfo,
Relay_QueueItem realyItem,
Relay_SmartHost[] smartHosts)
{
if (server == null)
{
throw new ArgumentNullException("server");
}
if (localBindInfo == null)
{
throw new ArgumentNullException("localBindInfo");
}
if (realyItem == null)
{
throw new ArgumentNullException("realyItem");
}
if (smartHosts == null)
{
throw new ArgumentNullException("smartHosts");
}
m_pServer = server;
m_pLocalBindInfo = localBindInfo;
m_pRelayItem = realyItem;
m_pSmartHosts = smartHosts;
m_RelayMode = Relay_Mode.SmartHost;
m_SessionID = Guid.NewGuid().ToString();
m_SessionCreateTime = DateTime.Now;
m_pTargets = new List <Relay_Target>();
}
/// <summary>
/// Completes relay session and does clean up. This method is thread-safe.
/// </summary>
/// <param name="exception">Exception happened or null if relay completed successfully.</param>
public void Dispose(Exception exception)
{
try
{
lock (this)
{
if (m_IsDisposed)
{
return;
}
try
{
m_pServer.OnSessionCompleted(this, exception);
}
catch {}
m_pServer.Sessions.Remove(this);
m_IsDisposed = true;
m_pLocalBindInfo = null;
m_pRelayItem = null;
m_pSmartHosts = null;
if (m_pSmtpClient != null)
{
m_pSmtpClient.Dispose();
m_pSmtpClient = null;
}
m_pTargets = null;
if (m_pActiveTarget != null)
{
m_pServer.RemoveIpUsage(m_pActiveTarget.Target.Address);
m_pActiveTarget = null;
}
m_pServer = null;
}
}
catch (Exception x)
{
if (m_pServer != null)
{
m_pServer.OnError(x);
}
}
}
/// <summary>
/// Dns relay session constructor.
/// </summary>
/// <param name="server">Owner relay server.</param>
/// <param name="localBindInfo">Local bind info.</param>
/// <param name="realyItem">Relay item.</param>
/// <exception cref="ArgumentNullException">Is raised when <b>server</b>,<b>localBindInfo</b> or <b>realyItem</b> is null.</exception>
/// <exception cref="ArgumentException">Is raised when any of the arguments has invalid value.</exception>
internal Relay_Session(Relay_Server server, IPBindInfo localBindInfo, Relay_QueueItem realyItem)
{
if (server == null)
{
throw new ArgumentNullException("server");
}
if (localBindInfo == null)
{
throw new ArgumentNullException("localBindInfo");
}
if (realyItem == null)
{
throw new ArgumentNullException("realyItem");
}
m_pServer = server;
m_pLocalBindInfo = localBindInfo;
m_pRelayItem = realyItem;
m_SessionID = Guid.NewGuid().ToString();
m_SessionCreateTime = DateTime.Now;
m_pTargets = new List<Relay_Target>();
}
/// <summary>
/// Completes relay session and does clean up. This method is thread-safe.
/// </summary>
/// <param name="exception">Exception happened or null if relay completed successfully.</param>
public void Dispose(Exception exception)
{
try
{
lock (this)
{
if (m_IsDisposed)
{
return;
}
try
{
m_pServer.OnSessionCompleted(this, exception);
}
catch {}
m_pServer.Sessions.Remove(this);
m_IsDisposed = true;
m_pLocalBindInfo = null;
m_pRelayItem = null;
m_pSmartHosts = null;
if (m_pSmtpClient != null)
{
m_pSmtpClient.Dispose();
m_pSmtpClient = null;
}
m_pTargets = null;
if (m_pActiveTarget != null)
{
m_pServer.RemoveIpUsage(m_pActiveTarget.Target.Address);
m_pActiveTarget = null;
}
m_pServer = null;
}
}
catch (Exception x)
{
if (m_pServer != null)
{
m_pServer.OnError(x);
}
}
}
/// <summary>
/// Processes relay queue.
/// </summary>
private void Run()
{
while (m_IsRunning)
{
try
{
// Bind info has changed, create new local end points.
if (m_HasBindingsChanged)
{
m_pLocalEndPoints.Clear();
foreach (IPBindInfo binding in m_pBindings)
{
if (binding.IP == IPAddress.Any)
{
foreach (IPAddress ip in Dns.GetHostAddresses(""))
{
if (ip.AddressFamily == AddressFamily.InterNetwork)
{
IPBindInfo b = new IPBindInfo(binding.HostName,
binding.Protocol,
ip,
25);
if (!m_pLocalEndPoints.Contains(b))
{
m_pLocalEndPoints.Add(b);
}
}
}
}
else if (binding.IP == IPAddress.IPv6Any)
{
foreach (IPAddress ip in Dns.GetHostAddresses(""))
{
if (ip.AddressFamily == AddressFamily.InterNetworkV6)
{
IPBindInfo b = new IPBindInfo(binding.HostName,
binding.Protocol,
ip,
25);
if (!m_pLocalEndPoints.Contains(b))
{
m_pLocalEndPoints.Add(b);
}
}
}
}
else
{
IPBindInfo b = new IPBindInfo(binding.HostName,
binding.Protocol,
binding.IP,
25);
if (!m_pLocalEndPoints.Contains(b))
{
m_pLocalEndPoints.Add(b);
}
}
}
m_HasBindingsChanged = false;
}
// There are no local end points specified.
if (m_pLocalEndPoints.Count == 0)
{
Thread.Sleep(10);
}
// Maximum allowed relay sessions exceeded, skip adding new ones.
else if (m_MaxConnections != 0 && m_pSessions.Count >= m_MaxConnections)
{
Thread.Sleep(10);
}
else
{
Relay_QueueItem item = null;
// Get next queued message from highest possible priority queue.
foreach (Relay_Queue queue in m_pQueues)
{
item = queue.DequeueMessage();
// There is queued message.
if (item != null)
{
break;
}
// No messages in this queue, see next lower priority queue.
}
// There are no messages in any queue.
if (item == null)
{
Thread.Sleep(10);
}
// Create new session for queued relay item.
else
{
// Get round-robin local end point for that session.
// This ensures if multiple network connections, all will be load balanced.
IPBindInfo localBindInfo = m_pLocalEndPoints.Next();
if (m_RelayMode == Relay_Mode.Dns)
{
Relay_Session session = new Relay_Session(this, localBindInfo, item);
m_pSessions.Add(session);
ThreadPool.QueueUserWorkItem(session.Start);
}
else if (m_RelayMode == Relay_Mode.SmartHost)
{
// Get smart hosts in balance mode order.
Relay_SmartHost[] smartHosts = null;
if (m_SmartHostsBalanceMode == BalanceMode.FailOver)
{
smartHosts = m_pSmartHosts.ToArray();
}
else
{
smartHosts = m_pSmartHosts.ToCurrentOrderArray();
}
Relay_Session session = new Relay_Session(this,
localBindInfo,
item,
smartHosts);
m_pSessions.Add(session);
ThreadPool.QueueUserWorkItem(session.Start);
}
}
}
}
catch (Exception x)
{
OnError(x);
}
}
}
