/// <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>
/// 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>
/// 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);
}
/// <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);
}
}
}
}
}
