/// <summary> Close down jmdns. Release all resources and unregister all services.</summary>
public virtual async Task Close()
{
if (state != DNSState.CANCELED)
{
Task t = CloseMulticastSocket();
lock (this)
{
// Synchronize only if we are not already in process to prevent dead locks
// Stop JmDNS
state = DNSState.CANCELED; // This protects against recursive calls
UnregisterAllServices();
DisposeServiceCollectors();
// close socket
// Stop the timer
// TODO: how to replace this?
//timer.cancel();
// remove the shutdown hook
if (shutdown != null)
{
// TODO: need to replace this??
//Process.GetCurrentProcess().removeShutdownHook(shutdown.Instance);
}
}
await t;
}
}
/// <summary> Sets the state and notifies all objects that wait on JmDNS.</summary>
internal virtual void Cancel()
{
lock (this)
{
state = DNSState.CANCELED;
Monitor.PulseAll(this);
}
}
/// <summary> Sets the state and notifies all objects that wait on JmDNS.</summary>
internal virtual void RevertState()
{
lock (this)
{
state = state.Revert();
Monitor.PulseAll(this);
}
}
// State machine
/// <summary> Sets the state and notifies all objects that wait on JmDNS.</summary>
internal virtual void AdvanceState()
{
lock (this)
{
state = state.Advance();
Monitor.PulseAll(this);
}
}
private void Start(ICollection serviceInfos)
{
state = DNSState.PROBING_1;
incomingListener.Start();
new Prober(this).start();
foreach (ServiceInfo info in serviceInfos)
{
try
{
RegisterService(new ServiceInfo(info));
}
catch (Exception exception)
{
logger.Warn("start() Registration exception ", exception);
}
}
}
/// <summary> Recover jmdns when there is an error.</summary>
protected internal virtual void Recover()
{
logger.Debug("recover()");
// We have an IO error so lets try to recover if anything happens lets close it.
// This should cover the case of the IP address changing under our feet
if (DNSState.CANCELED != state)
{
lock (this)
{
// Synchronize only if we are not already in process to prevent dead locks
//
logger.Debug("recover() Cleanning up");
// Stop JmDNS
state = DNSState.CANCELED; // This protects against recursive calls
// We need to keep a copy for reregistration
ICollection oldServiceInfos = new ArrayList(services.Values);
// Cancel all services
UnregisterAllServices();
DisposeServiceCollectors();
//
// close multicast socket
CloseMulticastSocket();
//
cache.clear();
logger.Debug("recover() All is clean");
//
// All is clear now start the services
//
try
{
OpenMulticastSocket(localHost, ipv6);
Start(oldServiceInfos);
}
catch (Exception exception)
{
logger.Warn("recover() Start services exception ", exception);
}
logger.Warn("recover() We are back!");
}
}
}
public void Run(object state)
{
DNSOutgoing out_Renamed = null;
try
{
// send probes for JmDNS itself
if (Enclosing_Instance.State == taskState)
{
if (out_Renamed == null)
{
out_Renamed = new DNSOutgoing(DNSConstants.FLAGS_QR_RESPONSE | DNSConstants.FLAGS_AA);
}
DNSRecord answer = Enclosing_Instance.localHost.DNS4AddressRecord;
if (answer != null)
{
out_Renamed.AddAnswer(answer, 0);
}
answer = Enclosing_Instance.localHost.DNS6AddressRecord;
if (answer != null)
{
out_Renamed.AddAnswer(answer, 0);
}
Enclosing_Instance.AdvanceState();
}
// send announces for services
// Defensively copy the services into a local list,
// to prevent race conditions with methods registerService
// and unregisterService.
IList list;
lock (Enclosing_Instance)
{
list = new ArrayList(Enclosing_Instance.services.Values);
}
foreach (ServiceInfo info in list)
{
lock (info)
{
if (info.State == taskState && info.task == this)
{
info.AdvanceState();
logger.Debug("run() JmDNS announcing " + info.QualifiedName + " state " + info.State);
if (out_Renamed == null)
{
out_Renamed = new DNSOutgoing(DNSConstants.FLAGS_QR_RESPONSE | DNSConstants.FLAGS_AA);
}
out_Renamed.AddAnswer(new Pointer(info.type, DNSConstants.TYPE_PTR, DNSConstants.CLASS_IN, DNSConstants.DNS_TTL, info.QualifiedName), 0);
out_Renamed.AddAnswer(new Service(info.QualifiedName, DNSConstants.TYPE_SRV, DNSConstants.CLASS_IN, DNSConstants.DNS_TTL, info.priority, info.weight, info.port, Enclosing_Instance.localHost.Name), 0);
out_Renamed.AddAnswer(new Text(info.QualifiedName, DNSConstants.TYPE_TXT, DNSConstants.CLASS_IN, DNSConstants.DNS_TTL, info.text), 0);
}
}
}
if (out_Renamed != null)
{
logger.Debug("run() JmDNS announcing #" + taskState);
Enclosing_Instance.Send(out_Renamed);
}
else
{
// If we have nothing to send, another timer taskState ahead
// of us has done the job for us. We can cancel.
cancel();
}
}
catch (Exception e)
{
logger.Warn("run() exception ", e);
Enclosing_Instance.Recover();
}
taskState = taskState.Advance();
if (!taskState.Announcing)
{
cancel();
new Renewer(enclosingInstance).start();
}
}
/// <summary> Sets the state and notifies all objects that wait on JmDNS.</summary>
internal virtual void Cancel()
{
lock (this)
{
state = DNSState.CANCELED;
Monitor.PulseAll(this);
}
}
// State machine
/// <summary> Sets the state and notifies all objects that wait on JmDNS.</summary>
internal virtual void AdvanceState()
{
lock (this)
{
state = state.Advance();
Monitor.PulseAll(this);
}
}
/// <summary> Sets the state and notifies all objects that wait on JmDNS.</summary>
internal virtual void RevertState()
{
lock (this)
{
state = state.Revert();
Monitor.PulseAll(this);
}
}
private void Start(ICollection serviceInfos)
{
state = DNSState.PROBING_1;
incomingListener.Start();
new Prober(this).start();
foreach (ServiceInfo info in serviceInfos)
{
try
{
RegisterService(new ServiceInfo(info));
}
catch (Exception exception)
{
logger.Warn("start() Registration exception ", exception);
}
}
}
/// <summary> Close down jmdns. Release all resources and unregister all services.</summary>
public virtual async Task Close()
{
if (state != DNSState.CANCELED)
{
Task t = CloseMulticastSocket();
lock (this)
{
// Synchronize only if we are not already in process to prevent dead locks
// Stop JmDNS
state = DNSState.CANCELED; // This protects against recursive calls
UnregisterAllServices();
DisposeServiceCollectors();
// close socket
// Stop the timer
// TODO: how to replace this?
//timer.cancel();
// remove the shutdown hook
if (shutdown != null)
{
// TODO: need to replace this??
//Process.GetCurrentProcess().removeShutdownHook(shutdown.Instance);
}
}
await t;
}
}
/// <summary> Recover jmdns when there is an error.</summary>
protected internal virtual void Recover()
{
logger.Debug("recover()");
// We have an IO error so lets try to recover if anything happens lets close it.
// This should cover the case of the IP address changing under our feet
if (DNSState.CANCELED != state)
{
lock (this)
{
// Synchronize only if we are not already in process to prevent dead locks
//
logger.Debug("recover() Cleanning up");
// Stop JmDNS
state = DNSState.CANCELED; // This protects against recursive calls
// We need to keep a copy for reregistration
ICollection oldServiceInfos = new ArrayList(services.Values);
// Cancel all services
UnregisterAllServices();
DisposeServiceCollectors();
//
// close multicast socket
CloseMulticastSocket();
//
cache.clear();
logger.Debug("recover() All is clean");
//
// All is clear now start the services
//
try
{
OpenMulticastSocket(localHost, ipv6);
Start(oldServiceInfos);
}
catch (Exception exception)
{
logger.Warn("recover() Start services exception ", exception);
}
logger.Warn("recover() We are back!");
}
}
}
public void Run(object state)
{
DNSOutgoing out_Renamed = null;
try
{
// send probes for JmDNS itself
if (Enclosing_Instance.State == taskState)
{
if (out_Renamed == null)
{
out_Renamed = new DNSOutgoing(DNSConstants.FLAGS_QR_RESPONSE | DNSConstants.FLAGS_AA);
}
DNSRecord answer = Enclosing_Instance.localHost.DNS4AddressRecord;
if (answer != null)
out_Renamed.AddAnswer(answer, 0);
answer = Enclosing_Instance.localHost.DNS6AddressRecord;
if (answer != null)
out_Renamed.AddAnswer(answer, 0);
Enclosing_Instance.AdvanceState();
}
// send announces for services
// Defensively copy the services into a local list,
// to prevent race conditions with methods registerService
// and unregisterService.
IList list;
lock (Enclosing_Instance)
{
list = new ArrayList(Enclosing_Instance.services.Values);
}
foreach (ServiceInfo info in list)
{
lock (info)
{
if (info.State == taskState && info.task == this)
{
info.AdvanceState();
logger.Debug("run() JmDNS announced " + info.QualifiedName + " state " + info.State);
if (out_Renamed == null)
{
out_Renamed = new DNSOutgoing(DNSConstants.FLAGS_QR_RESPONSE | DNSConstants.FLAGS_AA);
}
out_Renamed.AddAnswer(new Pointer(info.type, DNSConstants.TYPE_PTR, DNSConstants.CLASS_IN, DNSConstants.DNS_TTL, info.QualifiedName), 0);
out_Renamed.AddAnswer(new Service(info.QualifiedName, DNSConstants.TYPE_SRV, DNSConstants.CLASS_IN, DNSConstants.DNS_TTL, info.priority, info.weight, info.port, Enclosing_Instance.localHost.Name), 0);
out_Renamed.AddAnswer(new Text(info.QualifiedName, DNSConstants.TYPE_TXT, DNSConstants.CLASS_IN, DNSConstants.DNS_TTL, info.text), 0);
}
}
}
if (out_Renamed != null)
{
logger.Debug("run() JmDNS announced");
Enclosing_Instance.Send(out_Renamed);
}
else
{
// If we have nothing to send, another timer taskState ahead
// of us has done the job for us. We can cancel.
cancel();
}
}
catch (Exception e)
{
logger.Warn("run() exception ", e);
Enclosing_Instance.Recover();
}
taskState = taskState.Advance();
if (!taskState.Announced)
{
cancel();
}
}
public void Run(object state)
{
lock (Enclosing_Instance.IOLock)
{
DNSOutgoing out_Renamed = null;
try
{
// send probes for JmDNS itself
if (Enclosing_Instance.State == taskState && Enclosing_Instance.Task == this)
{
if (out_Renamed == null)
{
out_Renamed = new DNSOutgoing(DNSConstants.FLAGS_QR_QUERY);
}
out_Renamed.AddQuestion(new DNSQuestion(Enclosing_Instance.localHost.Name, DNSConstants.TYPE_ANY, DNSConstants.CLASS_IN));
DNSRecord answer = Enclosing_Instance.localHost.DNS4AddressRecord;
if (answer != null)
out_Renamed.AddAuthorativeAnswer(answer);
answer = Enclosing_Instance.localHost.DNS6AddressRecord;
if (answer != null)
out_Renamed.AddAuthorativeAnswer(answer);
Enclosing_Instance.AdvanceState();
}
// send probes for services
// Defensively copy the services into a local list,
// to prevent race conditions with methods registerService
// and unregisterService.
IList list;
lock (Enclosing_Instance)
{
list = new ArrayList(Enclosing_Instance.services.Values);
}
foreach (ServiceInfo info in list)
{
lock (info)
{
if (info.State == taskState && info.task == this)
{
info.AdvanceState();
logger.Info("run() JmDNS probing " + info.QualifiedName + " state " + info.State);
if (out_Renamed == null)
{
out_Renamed = new DNSOutgoing(DNSConstants.FLAGS_QR_QUERY);
out_Renamed.AddQuestion(new DNSQuestion(info.QualifiedName, DNSConstants.TYPE_ANY, DNSConstants.CLASS_IN));
}
out_Renamed.AddAuthorativeAnswer(new Service(info.QualifiedName, DNSConstants.TYPE_SRV, DNSConstants.CLASS_IN, DNSConstants.DNS_TTL, info.priority, info.weight, info.port, info.server));
}
}
}
if (out_Renamed != null)
{
logger.Debug("run() JmDNS probing #" + taskState);
Enclosing_Instance.Send(out_Renamed);
}
else
{
// If we have nothing to send, another timer taskState ahead
// of us has done the job for us. We can cancel.
cancel();
return ;
}
}
catch (Exception e)
{
logger.Warn("run() exception ", e);
Enclosing_Instance.Recover();
}
taskState = taskState.Advance();
if (!taskState.Probing)
{
cancel();
new Announcer(enclosingInstance).start();
}
}
}
