/// <summary>
/// Initializes the device. This method builds the colletion of internal device services, sets
/// the devices transport address and adds DPWS required namespaces to the devices namespace collection.
/// </summary>
public static void Initialize(Binding binding, ProtocolVersion v)
{
m_binding = binding;
string addr = binding.Transport.EndpointAddress.AbsoluteUri;
int index = addr.LastIndexOf('/');
m_address = "urn:uuid:" + addr.Substring(index + 1);
SubscriptionManager = new DpwsWseSubscriptionMgr(binding, v);
if (v != null)
{
// Add disco services to udp service endpoints collection
m_discoveryService = new DpwsDeviceDiscoService(v);
m_discoGreeting = new DpwsDiscoGreeting(v);
// Create a new udp service host and add the discovery endpoints
WsUdpServiceHost.Instance.AddServiceEndpoint(m_discoveryService);
}
// Add metadata get service endpoint
m_discoMexService = new DpwsDeviceMexService(v);
m_hostedServices.DiscoMexService = m_discoMexService;
// Add direct probe service endpoint
if (m_discoveryService != null)
{
m_hostedServices.Add(m_discoveryService);
}
// Create a new http service host and add hosted services endpoints
m_httpServiceHost = new WsHttpServiceHost(m_binding, m_hostedServices);
System.Ext.Console.Write("IP Address: " + WsNetworkServices.GetLocalIPV4Address());
}
/// <summary>
/// Creates an instance of the UDP binding element
/// </summary>
/// <param name="cfg">The configuration associated with this binding element.</param>
public UdpTransportBindingElement(UdpTransportBindingConfig cfg)
{
m_config = cfg;
if (s_localIP == null)
{
s_localIP = IPAddress.Parse(WsNetworkServices.GetLocalIPV4Address());
}
}
/// <summary>
/// Method used to send Hello and Bye messages
/// </summary>
/// <param name="greetingType">An integer representing the type of greeting 0 = Hello, 1 = Bye.</param>
public static void SendGreetingMessage(bool isHello)
{
// If Adhoc disco is turned off return. Adhoc disco is optional with a Discovery Proxy
if (Device.SupressAdhoc == true)
{
return;
}
byte[] greetingsMessage = null;
if (isHello)
{
greetingsMessage = BuildHelloMessage(Device.DiscoVersion.WellKnownAddress, null, null);
}
else
{
greetingsMessage = BuildByeMessage(Device.DiscoVersion.WellKnownAddress, null, null);
}
// Create a UdpClient used to send Hello and Bye messages
Socket udpClient = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
// Very important - Set default multicast interface for the underlying socket
byte[] ipBytes = IPAddress.Parse(WsNetworkServices.GetLocalIPV4Address()).GetAddressBytes();
long longIP = (long)((ipBytes[0] + (ipBytes[1] << 0x08) + (ipBytes[2] << 0x10) + (ipBytes[3] << 0x18)) & 0xFFFFFFFF);
udpClient.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastInterface, (int)longIP);
if (DiscoveryEP == null)
{
DiscoveryEP = new IPEndPoint(new IPAddress(DiscoveryAddress), DiscoveryPort);
}
// Random back off implemented as per soap over udp specification
// for unreliable multicast message exchange
Random rand = new Random();
int backoff = 0;
for (int i = 0; i < MulticastUdpRepeat; ++i)
{
if (i == 0)
{
backoff = rand.Next(UdpMaxDelay - UdpMinDelay) + UdpMinDelay;
}
else
{
backoff = backoff * 2;
backoff = backoff > UdpUpperDelay ? UdpUpperDelay : backoff;
}
Thread.Sleep(backoff);
udpClient.SendTo(greetingsMessage, greetingsMessage.Length, SocketFlags.None, DiscoveryEP);
}
udpClient.Close();
}
/// <summary>
/// Creates an instance of the configuration for the HTTP transport
/// </summary>
/// <param name="serviceUrn">The service Urn.</param>
/// <param name="port">The servce port.</param>
public HttpTransportBindingConfig(string serviceUrn, int port)
{
this.ServiceUrn = new Uri(serviceUrn);
string transport = "http://" + WsNetworkServices.GetLocalIPV4Address() + ":" + port + "/";
if (serviceUrn.IndexOf("urn:uuid:") == 0)
{
this.EndpointAddress = new Uri(transport + serviceUrn.Substring(9), UriKind.Absolute); // strip off urn:uuid:
}
else
{
this.EndpointAddress = new Uri(transport + serviceUrn, UriKind.Absolute);
}
}
/// <summary>
/// Processes a message
/// </summary>
/// <param name="stream">The message being processed.</param>
/// <param name="ctx">The context associated with the message.</param>
/// <returns>The handling status for this operation.</returns>
protected override ChainResult OnProcessInputMessage(ref WsMessage msg, BindingContext ctx)
{
byte[] soapMessage = null;
byte[] buffer = new byte[MaxUdpPacketSize];
while (true)
{
EndPoint remoteEndpoint = new IPEndPoint(IPAddress.Any, 0);
int size = m_udpReceiveClient.ReceiveFrom(buffer, MaxUdpPacketSize, SocketFlags.None, ref remoteEndpoint);
// If the stack is set to ignore request from this address do so
if (m_config.IgnoreRequestsFromThisIp &&
((IPEndPoint)m_remoteEndpoint).Address.ToString() == WsNetworkServices.GetLocalIPV4Address())
{
continue;
}
if (size > 0)
{
soapMessage = new byte[size];
Array.Copy(buffer, soapMessage, size);
}
else
{
System.Ext.Console.Write("UDP Receive returned 0 bytes");
}
m_remoteEndpoint = remoteEndpoint;
break;
}
System.Ext.Console.Write("UDP Request From: " + m_remoteEndpoint.ToString());
System.Ext.Console.Write(soapMessage);
msg.Body = soapMessage;
return(ChainResult.Continue);
}
/// <summary>
/// Use to send a resolve request to the ws-discovery address and receive a resolve match.
/// </summary>
/// <param name="message">A byte array containing a the resolve message.</param>
/// <param name="messageID">
/// A string containing the message ID of a resolve request. This ID will be used to validate against
/// a ResolveMatch received if it don't match, the ResolveMatch is discarded.
/// </param>
/// <param name="timeout">
/// A DateTime value containing the length of time this request will wait for resolve match.
/// until the timeout value has expired.
/// </param>
/// <returns>A resolve match object.</returns>
private DpwsServiceDescription SendResolveRequest(byte[] message, string messageID, long timeout)
{
WsMessageCheck messageCheck = new WsMessageCheck();
DpwsServiceDescription resolveMatch = null;
System.Ext.Console.Write("");
System.Ext.Console.Write("Sending Resolve:");
System.Ext.Console.Write(message);
// Create a new UdpClient
using (Socket udpClient = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
{
uint ipLocal = WsNetworkServices.GetLocalIPV4AddressValue();
IPAddress localIP = IPAddress.Parse(WsNetworkServices.GetLocalIPV4Address());
IPEndPoint localEP = new IPEndPoint(localIP, 0);
// Very important - Set default multicast interface for the underlying socket
udpClient.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastInterface, (int)ipLocal);
udpClient.ReceiveTimeout = (int)timeout;
udpClient.Bind(localEP);
// Random back off implemented as per soap over udp specification
// for unreliable multicast message exchange
Thread th = SendWithBackoff(message, udpClient);
// Wait for resolve match as long a timeout has not expired
byte[] resolveResponse = new byte[c_MaxUdpPacketSize];
EndPoint remoteEP = new IPEndPoint(IPAddress.Any, 0);
int responseLength;
DpwsDiscoClientProcessor soapProcessor = new DpwsDiscoClientProcessor(m_version);
while (true)
{
// Since MF sockets does not have an IOControl method catch 10054 to get around the problem
// with Upd and ICMP.
try
{
// Wait for response
responseLength = udpClient.ReceiveFrom(resolveResponse, c_MaxUdpPacketSize, SocketFlags.None, ref remoteEP);
}
catch (SocketException se)
{
if ((SocketError)se.ErrorCode == SocketError.ConnectionReset)
{
Thread.Sleep(100);
continue;
}
if ((SocketError)se.ErrorCode == SocketError.TimedOut)
{
break;
}
throw se;
}
// If we received process resolve match
if (responseLength > 0)
{
System.Ext.Console.Write("ResolveMatches Response From: " + ((IPEndPoint)remoteEP).Address.ToString());
System.Ext.Console.Write(resolveResponse);
try
{
WsWsaHeader header = new WsWsaHeader();
XmlReader reader = WsSoapMessageParser.ParseSoapMessage(resolveResponse, ref header, m_version);
WsMessage msg = new WsMessage(header, null, WsPrefix.Wsdp);
msg.Reader = reader;
resolveMatch = soapProcessor.ProcessResolveMatch(msg, messageID, (IPEndPoint)remoteEP, messageCheck);
if (resolveMatch != null)
{
break;
}
}
catch (Exception e)
{
System.Ext.Console.Write(e.Message);
}
}
}
th.Join();
}
// Display results
if (resolveMatch == null)
{
System.Ext.Console.Write("Resolve timed out.");
}
return(resolveMatch);
}
/// <summary>
/// Sends a Probe request and parses ProbeMatches responses.
/// </summary>
/// <param name="filters">
/// A DpwsServiceTypes object containing a collection of types a service must support to signal a match.
/// Null = any type.
/// </param>
/// <param name="maxProbeMatches">
/// An integer representing the maximum number of matches to reveive within the timout period. Pass 0 to receive
/// as many matches as possible before the timeout expires.
/// </param>
/// <param name="timeout">
/// An integer specifying a request timeout in milliseconds. Pass -1 to wait ReceiveTimeout.
/// </param>
/// <remarks>
/// A Probe is used to discover services on a network. The Probe method sends a UDP request to the
/// Dpws multicast address, 239.255.255.250:3702. Any service that implements types specified in the
/// filters parameter should respond with a ProbeMatches message. The ProbeMatches mesgage is unicast
/// back to the that client that made the request. If a null filter is supplied any Dpws complient
/// service should reply with a ProbeMatches reponse. Probe waits DpwsDiceoveryCleint.ReceiveTimout
/// for probe matches.
/// </remarks>
/// <returns>
/// A collection of ProbeMatches objects. A ProbeMatch object contains endpoint details used
/// used to locate the actual service on a network and the types supported by the service.
/// </returns>
public DpwsServiceDescriptions Probe(DpwsServiceTypes filters, int maxProbeMatches, int timeout)
{
// Build the probe request message
WsMessageCheck messageCheck = new WsMessageCheck();
string messageID = null;
WsMessage probeRequest = BuildProbeRequest(DiscoVersion.DiscoveryWellKnownAddress, filters, out messageID);
DpwsServiceDescriptions probeMatches = new DpwsServiceDescriptions();
System.Ext.Console.Write("");
System.Ext.Console.Write("Sending Probe:");
System.Ext.Console.Write(probeRequest.Body as byte[]);
System.Ext.Console.Write("");
// Create a new UdpClient
using (Socket udpClient = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
{
// Very important - Set default multicast interface for the underlying socket
uint ipLocal = WsNetworkServices.GetLocalIPV4AddressValue();
IPAddress localIP = IPAddress.Parse(WsNetworkServices.GetLocalIPV4Address());
IPEndPoint localEP = new IPEndPoint(localIP, 0);
udpClient.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastInterface, (int)ipLocal);
udpClient.ReceiveTimeout = timeout;
udpClient.Bind(localEP);
// Random back off implemented as per soap over udp specification
// for unreliable multicast message exchange
Thread th = SendWithBackoff((byte[])probeRequest.Body, udpClient);
// Create probe matches collection and set expiration loop timer
byte[] probeResponse = new byte[c_MaxUdpPacketSize];
EndPoint remoteEP = new IPEndPoint(IPAddress.Any, 0);
int responseLength;
DpwsDiscoClientProcessor soapProcessor = new DpwsDiscoClientProcessor(m_version);
while (true)
{
// Since MF sockets does not have an IOControl method catch 10054 to get around the problem
// with Upd and ICMP.
try
{
// Wait for response
responseLength = udpClient.ReceiveFrom(probeResponse, c_MaxUdpPacketSize, SocketFlags.None, ref remoteEP);
}
catch (SocketException se)
{
if ((SocketError)se.ErrorCode == SocketError.ConnectionReset)
{
Thread.Sleep(100);
continue;
}
// Timeout
if ((SocketError)se.ErrorCode == SocketError.TimedOut)
{
break;
}
throw se;
}
// If we received process probe match
if (responseLength > 0)
{
System.Ext.Console.Write("");
System.Ext.Console.Write("ProbeMatches Response From: " + ((IPEndPoint)remoteEP).Address.ToString());
System.Ext.Console.Write(probeResponse);
// Process the response
try
{
WsWsaHeader header = new WsWsaHeader();
XmlReader reader = WsSoapMessageParser.ParseSoapMessage(probeResponse, ref header, m_version);
WsMessage msg = new WsMessage(header, null, WsPrefix.Wsdp);
msg.Reader = reader;
DpwsServiceDescriptions tempMatches = soapProcessor.ProcessProbeMatch(msg, messageID, (IPEndPoint)remoteEP, messageCheck);
if (tempMatches != null)
{
int count = maxProbeMatches < tempMatches.Count ? maxProbeMatches : tempMatches.Count;
for (int i = 0; i < count; i++)
{
probeMatches.Add(tempMatches[i]);
}
maxProbeMatches -= count;
}
}
catch (Exception e)
{
System.Ext.Console.Write("");
System.Ext.Console.Write(e.Message);
System.Ext.Console.Write("");
}
// If maxProbeRequest is set check count
if (maxProbeMatches <= 0)
{
break;
}
}
}
th.Join();
}
// Display results
if (probeMatches.Count == 0)
{
System.Ext.Console.Write("Probe timed out.");
}
else
{
System.Ext.Console.Write("Received " + probeMatches.Count + " probeMatches matches.");
}
return(probeMatches);
}
public virtual WsMessage ProbeMatch(WsMessage probe, DpwsHostedService matchedService)
{
XmlReader reader = probe.Reader;
WsWsaHeader header = probe.Header;
// Performance debugging
DebugTiming timeDebuger = new DebugTiming();
long startTime = timeDebuger.ResetStartTime("");
// Build ProbeMatch
using (XmlMemoryWriter xmlWriter = XmlMemoryWriter.Create())
{
// If a Host exist write the Host namespace
WsXmlNamespaces additionalPrefixes = null;
if (Device.Host != null)
{
additionalPrefixes = new WsXmlNamespaces();
additionalPrefixes.Add(Device.Host.ServiceNamespace);
}
WsWsaHeader matchHeader = new WsWsaHeader(
this.Version.DiscoveryNamespace + "/ProbeMatches", // Action
header.MessageID, // RelatesTo
this.Version.AnonymousUri, // To
null, null, null); // ReplyTo, From, Any
WsMessage msg = new WsMessage(matchHeader, null, WsPrefix.Wsd | WsPrefix.Wsdp, additionalPrefixes,
new WsAppSequence(Device.AppSequence, Device.SequenceID, Device.MessageID));
WsSoapMessageWriter smw = new WsSoapMessageWriter(this.Version);
smw.WriteSoapMessageStart(xmlWriter, msg);
// Performance debuging
timeDebuger.PrintElapsedTime("*****Write Header Took");
// write body
xmlWriter.WriteStartElement(WsNamespacePrefix.Wsd, "ProbeMatches", null);
xmlWriter.WriteStartElement(WsNamespacePrefix.Wsd, "ProbeMatch", null);
xmlWriter.WriteStartElement(WsNamespacePrefix.Wsa, "EndpointReference", null);
xmlWriter.WriteStartElement(WsNamespacePrefix.Wsa, "Address", null);
xmlWriter.WriteString(matchedService == null ? Device.EndpointAddress : matchedService.EndpointAddress);
xmlWriter.WriteEndElement();
xmlWriter.WriteEndElement();
// Write hosted service types
xmlWriter.WriteStartElement(WsNamespacePrefix.Wsd, "Types", null);
WriteDeviceServiceTypes(xmlWriter);
xmlWriter.WriteEndElement(); // End Types
xmlWriter.WriteStartElement(WsNamespacePrefix.Wsd, "XAddrs", null);
string transport = Device.TransportAddress;
if (matchedService != null)
{
int idx = transport.LastIndexOf('/');
if (idx != -1)
{
transport = transport.Substring(0, idx + 1);
transport += matchedService.EndpointAddress.Substring(matchedService.EndpointAddress.IndexOf("urn:uuid:") + 9);
}
}
int idx2 = transport.ToLower().IndexOf("localhost");
if (idx2 != -1)
{
transport = transport.Substring(0, idx2) + WsNetworkServices.GetLocalIPV4Address() + transport.Substring(idx2 + 9 /*localhost*/);
}
xmlWriter.WriteString(transport);
xmlWriter.WriteEndElement();
xmlWriter.WriteStartElement(WsNamespacePrefix.Wsd, "MetadataVersion", null);
xmlWriter.WriteString(Device.MetadataVersion.ToString());
xmlWriter.WriteEndElement();
xmlWriter.WriteEndElement();
xmlWriter.WriteEndElement();
smw.WriteSoapMessageEnd(xmlWriter);
msg.Body = xmlWriter.ToArray();
// Performance debuging
timeDebuger.PrintTotalTime(startTime, "***ProbeMatch Took");
// Delay probe match as per Ws-Discovery specification (2.4 Protocol Assignments)
Thread.Sleep(new Random().Next(Device.ProbeMatchDelay));
// Return stream buffer
return(msg);
}
}
public virtual WsMessage ResolveMatch(WsMessage message)
{
XmlReader reader = message.Reader;
WsWsaHeader header = message.Header;
bool match = false;
string epAddr = "";
reader.ReadStartElement("Resolve", this.Version.DiscoveryNamespace);
if (reader.IsStartElement("EndpointReference", this.Version.AddressingNamespace) == false)
{
return(null);
}
WsWsaEndpointRef epRef = new WsWsaEndpointRef(reader, this.Version.AddressingNamespace);
epAddr = epRef.Address.AbsoluteUri;
if (Device.EndpointAddress != epAddr)
{
// If the destination endpoint is ours send a resolve match else return null
int servicesCount = Device.HostedServices.Count;
DpwsHostedService hostedService;
for (int i = 0; i < servicesCount; i++)
{
hostedService = (DpwsHostedService)Device.HostedServices[i];
// Skip internal services
if (hostedService.ServiceTypeName == "Internal")
{
continue;
}
if (hostedService.EndpointAddress == epAddr)
{
match = true;
break;
}
}
if (!match)
{
return(null);
}
}
// Build ResolveMatch
using (XmlMemoryWriter xmlWriter = XmlMemoryWriter.Create())
{
// If a Host exist write the Host namespace
WsXmlNamespaces additionalPrefixes = null;
if (Device.Host != null)
{
additionalPrefixes = new WsXmlNamespaces();
additionalPrefixes.Add(Device.Host.ServiceNamespace);
}
WsWsaHeader matchHeader = new WsWsaHeader(
this.Version.DiscoveryNamespace + "/ResolveMatches", // Action
header.MessageID, // RelatesTo
this.Version.AnonymousUri, // To
null, null, null); // ReplyTo, From, Any
WsMessage msg = new WsMessage(matchHeader, null, WsPrefix.Wsd | WsPrefix.Wsdp, additionalPrefixes,
new WsAppSequence(Device.AppSequence, Device.SequenceID, Device.MessageID));
WsSoapMessageWriter smw = new WsSoapMessageWriter(this.Version);
smw.WriteSoapMessageStart(xmlWriter, msg);
// write body
xmlWriter.WriteStartElement(WsNamespacePrefix.Wsd, "ResolveMatches", null);
xmlWriter.WriteStartElement(WsNamespacePrefix.Wsd, "ResolveMatch", null);
xmlWriter.WriteStartElement(WsNamespacePrefix.Wsa, "EndpointReference", null);
xmlWriter.WriteStartElement(WsNamespacePrefix.Wsa, "Address", null);
xmlWriter.WriteString(epRef.Address.AbsoluteUri);
xmlWriter.WriteEndElement(); // End Address
xmlWriter.WriteEndElement(); // End EndpointReference
// Write hosted service types
xmlWriter.WriteStartElement(WsNamespacePrefix.Wsd, "Types", null);
WriteDeviceServiceTypes(xmlWriter);
xmlWriter.WriteEndElement(); // End Types
string transport = Device.TransportAddress;
if (match)
{
int idx = transport.LastIndexOf('/');
if (idx != -1)
{
transport = transport.Substring(0, idx + 1);
transport += epAddr.Substring(epAddr.IndexOf("urn:uuid:") + 9);
}
}
int idx2 = transport.ToLower().IndexOf("localhost");
if (idx2 != -1)
{
transport = transport.Substring(0, idx2) + WsNetworkServices.GetLocalIPV4Address() + transport.Substring(idx2 + 9 /*localhost*/);
}
xmlWriter.WriteStartElement(WsNamespacePrefix.Wsd, "XAddrs", null);
xmlWriter.WriteString(transport);
xmlWriter.WriteEndElement(); // End XAddrs
xmlWriter.WriteStartElement(WsNamespacePrefix.Wsd, "MetadataVersion", null);
xmlWriter.WriteString(Device.MetadataVersion.ToString());
xmlWriter.WriteEndElement(); // End MetadataVersion
xmlWriter.WriteEndElement(); // End ResolveMatch
xmlWriter.WriteEndElement(); // End ResolveMatches
smw.WriteSoapMessageEnd(xmlWriter);
msg.Body = xmlWriter.ToArray();
// Return stream buffer
return(msg);
}
}
/// <summary>
/// Listens for Udp request on 239.255.255.250:3702
/// </summary>
/// <remarks>On initialization it sends a Discovery Hello message and listens on the Ws-Discovery
/// endpoint for a request. When a request arrives it starts a UdpProcess thread that processes the message.
/// The number of UdpProcessing threads are limited by the Device.MaxUdpRequestThreads property.
/// </remarks>
public void Listen()
{
// Create a duplicate message tester.
WsMessageCheck messageCheck = new WsMessageCheck(40);
// Create remote endpoint reference, start listening
byte[] buffer = new byte[c_MaxUdpPacketSize];
int size;
bool threadPoolDepletedFlag = false;
m_servicesRunning = !m_requestStop;
while (!m_requestStop)
{
try
{
// If threads ara availble receive next message. If we are waiting on threads let the socket
// buffer request until we get a thread. This will work until the reveice buffer is depleted
// at which time request will be dropped
if (m_threadManager.ThreadsAvailable == true)
{
threadPoolDepletedFlag = false;
EndPoint remoteEP = new IPEndPoint(IPAddress.Any, 0);
size = m_udpReceiveClient.ReceiveFrom(buffer, c_MaxUdpPacketSize, SocketFlags.None, ref remoteEP);
// If the stack is set to ignore request from this address do so
if (this.IgnoreRequestFromThisIP == true &&
((IPEndPoint)remoteEP).Address.ToString() == WsNetworkServices.GetLocalIPV4Address())
{
continue;
}
if (size > 0)
{
byte[] soapMessage = new byte[size];
Array.Copy(buffer, soapMessage, size);
System.Ext.Console.Write("UDP Request From: " + remoteEP.ToString());
System.Ext.Console.Write(new String(System.Text.Encoding.UTF8.GetChars(soapMessage)));
// Try to get a processing thread and process the request
m_threadManager.StartNewThread(new WsUdpMessageProcessor(m_serviceEndpoints, soapMessage, (IPEndPoint)remoteEP, messageCheck));
}
else
{
System.Ext.Console.Write("UDP Receive returned 0 bytes");
}
}
else
{
if (threadPoolDepletedFlag == false)
{
System.Ext.Console.Write("Udp service host waiting for a thread...");
threadPoolDepletedFlag = true;
}
}
}
catch (SocketException se)
{
// Since the MF Socket does not have IOControl that would be used to turn off ICMP notifications
// for UDP, catch 10054 and try to continue
if (se.ErrorCode == 10054)
{
continue;
}
}
catch (Exception e)
{
System.Ext.Console.Write(e.Message + " " + e.InnerException);
}
Thread.Sleep(100);
}
}
/// <summary>
/// Method used to send Hello and Bye messages
/// </summary>
/// <param name="greetingType">An integer representing the type of greeting 0 = Hello, 1 = Bye.</param>
public void SendGreetingMessage(bool isHello)
{
// If Adhoc disco is turned off return. Adhoc disco is optional with a Discovery Proxy
if (Device.SupressAdhoc == true)
{
return;
}
WsMessage greetingsMessage = null;
if (isHello)
{
greetingsMessage = BuildHelloMessage(Device.DiscoveryVersion.DiscoveryWellKnownAddress, null, null);
}
else
{
greetingsMessage = BuildByeMessage(Device.DiscoveryVersion.DiscoveryWellKnownAddress, null, null);
}
byte[] greeting = (byte[])greetingsMessage.Body;
System.Ext.Console.Write("UDP (" + (isHello ? "Hello" : "Bye") + ") multicast to: " + WsDiscovery.WsDiscoveryEndPoint.ToString());
System.Ext.Console.Write(greetingsMessage.Body as byte[]);
// Create a UdpClient used to send Hello and Bye messages
using (Socket udpClient = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
{
// Very important - Set default multicast interface for the underlying socket
udpClient.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastInterface, (int)WsNetworkServices.GetLocalIPV4AddressValue());
// Random back off implemented as per soap over udp specification
// for unreliable multicast message exchange
Random rand = new Random();
int backoff = 0;
for (int i = 0; i < MulticastUdpRepeat; ++i)
{
if (i == 0)
{
backoff = rand.Next(UdpMaxDelay - UdpMinDelay) + UdpMinDelay;
}
else
{
backoff = backoff * 2;
backoff = backoff > UdpUpperDelay ? UdpUpperDelay : backoff;
}
udpClient.SendTo(greeting, greeting.Length, SocketFlags.None, WsDiscovery.WsDiscoveryEndPoint);
Thread.Sleep(backoff);
}
}
}
/// <summary>
/// UDP resend timer callback. Resends repsonse data for UDP messages.
/// </summary>
/// <param name="arg"></param>
static private void UdpTimer(object arg)
{
int cnt;
UdpResend[] resend = null;
// get a copy of the resend list so that we don't have to lock the list
// while we resend
lock (s_repeats)
{
cnt = s_repeats.Count;
if (cnt > 0)
{
resend = (UdpResend[])s_repeats.ToArray(typeof(UdpResend));
}
else
{
s_udpTimer.Change(-1, -1);
}
}
if (cnt > 0)
{
using (Socket udpSendClient = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
{
IPEndPoint localEP = new IPEndPoint(s_localIP, 0);
udpSendClient.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastInterface, (int)WsNetworkServices.GetLocalIPV4AddressValue());
udpSendClient.Bind(localEP);
for (int i = cnt - 1; i >= 0; i--)
{
udpSendClient.SendTo(resend[i].Data, resend[i].Data.Length, SocketFlags.None, resend[i].RemoteEndpoint);
if (0 >= --((UdpResend)s_repeats[i]).RepeatCount)
{
s_repeats.RemoveAt(i);
}
}
}
}
}
/// <summary>
/// Use to send a resolve request to the ws-discovery address and receive a resolve match.
/// </summary>
/// <param name="message">A byte array containing a the resolve message.</param>
/// <param name="messageID">
/// A string containing the message ID of a resolve request. This ID will be used to validate against
/// a ResolveMatch received if it don't match, the ResolveMatch is discarded.
/// </param>
/// <param name="timeout">
/// A DateTime value containing the length of time this request will wait for resolve match.
/// until the timeout value has expired.
/// </param>
/// <returns>A resolve match object.</returns>
private DpwsServiceDescription SendResolveRequest(byte[] message, string messageID, long timeout)
{
WsMessageCheck messageCheck = new WsMessageCheck();
System.Ext.Console.Write("");
System.Ext.Console.Write("Sending Resolve:");
System.Ext.Console.Write(new string(new UTF8Encoding().GetChars(message)));
// Create a new UdpClient
Socket udpClient = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
IPEndPoint localEP = new IPEndPoint(IPAddress.Any, m_discoResponsePort);
udpClient.Bind(localEP);
// Very important - Set default multicast interface for the underlying socket
byte[] ipBytes = IPAddress.Parse(WsNetworkServices.GetLocalIPV4Address()).GetAddressBytes();
long longIP = (long)((ipBytes[0] + (ipBytes[1] << 0x08) + (ipBytes[2] << 0x10) + (ipBytes[3] << 0x18)) & 0xFFFFFFFF);
udpClient.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastInterface, (int)longIP);
// Random back off implemented as per soap over udp specification
// for unreliable multicast message exchange
SendWithBackoff(message, udpClient);
// Wait for resolve match as long a timeout has not expired
DpwsServiceDescription resolveMatch = null;
byte[] resolveResponse = new byte[c_MaxUdpPacketSize];
EndPoint remoteEP = new IPEndPoint(IPAddress.Any, 0);
int responseLength;
long endTime = (long)(DateTime.Now.Ticks + (timeout * 10000));
DpwsDiscoClientProcessor soapProcessor = new DpwsDiscoClientProcessor();
while (DateTime.Now.Ticks < endTime)
{
if (udpClient.Available > 0)
{
// Since MF sockets does not have an IOControl method catch 10054 to get around the problem
// with Upd and ICMP.
try
{
// Wait for response
responseLength = udpClient.ReceiveFrom(resolveResponse, c_MaxUdpPacketSize, SocketFlags.None, ref remoteEP);
}
catch (SocketException se)
{
if (se.ErrorCode == 10054)
{
continue;
}
throw se;
}
// If we received process resolve match
if (responseLength > 0)
{
System.Ext.Console.Write("");
System.Ext.Console.Write("ResolveMatches Response From: " + ((IPEndPoint)remoteEP).Address.ToString());
System.Ext.Console.Write(new String(System.Text.Encoding.UTF8.GetChars(resolveResponse)));
try
{
resolveMatch = soapProcessor.ProcessResolveMatch(resolveResponse, messageID, (IPEndPoint)remoteEP, messageCheck);
if (resolveMatch != null)
{
break;
}
}
catch (Exception e)
{
System.Ext.Console.Write("");
System.Ext.Console.Write(e.Message);
System.Ext.Console.Write("");
}
}
}
Thread.Sleep(10);
}
udpClient.Close();
udpClient = null;
// Display results
if (resolveMatch == null)
{
System.Ext.Console.Write("Resolve timed out.");
}
return(resolveMatch);
}
/// <summary>
/// Sends a Probe request and parses ProbeMatches responses.
/// </summary>
/// <param name="filters">
/// A DpwsServiceTypes object containing a collection of types a service must support to signal a match.
/// Null = any type.
/// </param>
/// <param name="maxProbeMatches">
/// An integer representing the maximum number of matches to reveive within the timout period. Pass 0 to receive
/// as many matches as possible before the timeout expires.
/// </param>
/// <param name="timeout">
/// An integer specifying a request timeout in milliseconds. Pass -1 to wait ReceiveTimeout.
/// </param>
/// <remarks>
/// A Probe is used to discover services on a network. The Probe method sends a UDP request to the
/// Dpws multicast address, 239.255.255.250:3702. Any service that implements types specified in the
/// filters parameter should respond with a ProbeMatches message. The ProbeMatches mesgage is unicast
/// back to the that client that made the request. If a null filter is supplied any Dpws complient
/// service should reply with a ProbeMatches reponse. Probe waits DpwsDiceoveryCleint.ReceiveTimout
/// for probe matches.
/// </remarks>
/// <returns>
/// A collection of ProbeMatches objects. A ProbeMatch object contains endpoint details used
/// used to locate the actual service on a network and the types supported by the service.
/// </returns>
public DpwsServiceDescriptions Probe(DpwsServiceTypes filters, int maxProbeMatches, int timeout)
{
// Build the probe request message
WsMessageCheck messageCheck = new WsMessageCheck();
string messageID = null;
byte[] probeRequest = BuildProbeRequest(DiscoVersion.WellKnownAddress, filters, out messageID);
System.Ext.Console.Write("");
System.Ext.Console.Write("Sending Probe:");
System.Ext.Console.Write(new string(new UTF8Encoding().GetChars(probeRequest)));
System.Ext.Console.Write("");
// Create a new UdpClient
Socket udpClient = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
IPEndPoint localEP = new IPEndPoint(IPAddress.Any, m_discoResponsePort);
udpClient.Bind(localEP);
// Very important - Set default multicast interface for the underlying socket
byte[] ipBytes = IPAddress.Parse(WsNetworkServices.GetLocalIPV4Address()).GetAddressBytes();
long longIP = (long)((ipBytes[0] + (ipBytes[1] << 0x08) + (ipBytes[2] << 0x10) + (ipBytes[3] << 0x18)) & 0xFFFFFFFF);
udpClient.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastInterface, (int)longIP);
// Random back off implemented as per soap over udp specification
// for unreliable multicast message exchange
SendWithBackoff(probeRequest, udpClient);
// Create probe matches collection and set expiration loop timer
DpwsServiceDescriptions probeMatches = new DpwsServiceDescriptions();
byte[] probeResponse = new byte[c_MaxUdpPacketSize];
EndPoint remoteEP = new IPEndPoint(IPAddress.Any, 0);
int responseLength;
// Multiply receive time by 10000 to convert milliseconds to 100 nano ticks
long endTime = (long)(DateTime.Now.Ticks + (timeout < 0 ? m_receiveTimeout * 10000 : timeout * 10000));
DpwsDiscoClientProcessor soapProcessor = new DpwsDiscoClientProcessor();
// Build probe matches collection as long as timeout has not expired
int noReceived = 0;
while (DateTime.Now.Ticks < endTime)
{
if (udpClient.Available > 0)
{
// If maxProbeRequest is set check count
if (maxProbeMatches > 0)
{
if (noReceived > maxProbeMatches)
{
break;
}
}
// Since MF sockets does not have an IOControl method catch 10054 to get around the problem
// with Upd and ICMP.
try
{
// Wait for response
responseLength = udpClient.ReceiveFrom(probeResponse, c_MaxUdpPacketSize, SocketFlags.None, ref remoteEP);
}
catch (SocketException se)
{
if (se.ErrorCode == 10054)
{
continue;
}
throw se;
}
// If we received process probe match
if (responseLength > 0)
{
System.Ext.Console.Write("");
System.Ext.Console.Write("ProbeMatches Response From: " + ((IPEndPoint)remoteEP).Address.ToString());
System.Ext.Console.Write(new String(System.Text.Encoding.UTF8.GetChars(probeResponse)));
// Process the response
try
{
DpwsServiceDescriptions tempMatches = soapProcessor.ProcessProbeMatch(probeResponse, messageID, (IPEndPoint)remoteEP, messageCheck);
if (tempMatches != null)
{
int count = tempMatches.Count;
for (int i = 0; i < count; i++)
{
probeMatches.Add(tempMatches[i]);
}
}
}
catch (Exception e)
{
System.Ext.Console.Write("");
System.Ext.Console.Write(e.Message);
System.Ext.Console.Write("");
}
// Increment the number received counter
++noReceived;
}
}
else
{
Thread.Sleep(1);
}
}
udpClient.Close();
udpClient = null;
// Display results
if (probeMatches == null)
{
System.Ext.Console.Write("Probe timed out.");
}
else
{
System.Ext.Console.Write("Received " + probeMatches.Count + " probeMatches matches.");
}
return(probeMatches);
}
