internal virtual bool ShouldIgnorePacket(SupportClass.PacketSupport packet)
{
bool result = false;
if (Address != null)
{
IPAddress from = packet.Address;
if (from != null)
{
// TODO: how to replace this?
// if (from.isLinkLocalAddress() && (!Address.isLinkLocalAddress()))
// {
// // Ignore linklocal packets on regular interfaces, unless this is
// // also a linklocal interface. This is to avoid duplicates. This is
// // a terrible hack caused by the lack of an API to get the address
// // of the interface on which the packet was received.
// result = true;
// }
if (IPAddress.IsLoopback(from) && (!IPAddress.IsLoopback(Address)))
{
// Ignore loopback packets on a regular interface unless this is
// also a loopback interface.
result = true;
}
}
}
return(result);
}
/// <summary> Send an outgoing multicast DNS message.</summary>
internal async Task Send(DNSOutgoing out_Renamed)
{
out_Renamed.Finish();
if (!out_Renamed.Empty)
{
SupportClass.PacketSupport packet = new SupportClass.PacketSupport(SupportClass.ToByteArray(out_Renamed.data), out_Renamed.off, new IPEndPoint(group, DNSConstants.MDNS_PORT));
try
{
DNSIncoming msg = new DNSIncoming(packet);
logger.Debug("send() JmDNS out:" + msg.Print(true));
}
catch (IOException e)
{
logger.Error("send(DNSOutgoing) - JmDNS can not parse what it sends!!!", e);
}
await SupportClass.UdpClientSupport.Send(socket, packet);
}
}
private void Socket_MessageReceived(Windows.Networking.Sockets.DatagramSocket sender, Windows.Networking.Sockets.DatagramSocketMessageReceivedEventArgs args)
{
uint dataLength = args.GetDataReader().UnconsumedBufferLength;
byte[] result = new byte[dataLength];
args.GetDataReader().ReadBytes(result);
SupportClass.PacketSupport packet = new SupportClass.PacketSupport(result, result.Length, new System.Net.IPEndPoint(System.Net.IPAddress.Parse(args.RemoteAddress.CanonicalName), int.Parse(args.RemotePort)));
try
{
if (Enclosing_Instance.localHost.ShouldIgnorePacket(packet))
{
return;
}
DNSIncoming msg = new DNSIncoming(packet);
logger.Debug("SocketListener.run() JmDNS in:" + msg.Print(true));
lock (Enclosing_Instance.IOLock)
{
if (msg.Query)
{
if (packet.Port != DNSConstants.MDNS_PORT)
{
Enclosing_Instance.HandleQuery(msg, packet.Address, packet.Port);
}
Enclosing_Instance.HandleQuery(msg, Enclosing_Instance.Group, DNSConstants.MDNS_PORT);
}
else
{
Enclosing_Instance.HandleResponse(msg);
}
}
}
catch (IOException e)
{
logger.Warn("run() exception ", e);
}
}
private void Socket_MessageReceived(Windows.Networking.Sockets.DatagramSocket sender, Windows.Networking.Sockets.DatagramSocketMessageReceivedEventArgs args)
{
uint dataLength = args.GetDataReader().UnconsumedBufferLength;
byte[] result = new byte[dataLength];
args.GetDataReader().ReadBytes(result);
SupportClass.PacketSupport packet = new SupportClass.PacketSupport(result, result.Length, new System.Net.IPEndPoint(System.Net.IPAddress.Parse(args.RemoteAddress.CanonicalName), int.Parse(args.RemotePort)));
try
{
if (Enclosing_Instance.localHost.ShouldIgnorePacket(packet))
return;
DNSIncoming msg = new DNSIncoming(packet);
logger.Debug("SocketListener.run() JmDNS in:" + msg.Print(true));
lock (Enclosing_Instance.IOLock)
{
if (msg.Query)
{
if (packet.Port != DNSConstants.MDNS_PORT)
{
Enclosing_Instance.HandleQuery(msg, packet.Address, packet.Port);
}
Enclosing_Instance.HandleQuery(msg, Enclosing_Instance.Group, DNSConstants.MDNS_PORT);
}
else
{
Enclosing_Instance.HandleResponse(msg);
}
}
}
catch (IOException e)
{
logger.Warn("run() exception ", e);
}
}
/// <summary> Send an outgoing multicast DNS message.</summary>
internal async Task Send(DNSOutgoing out_Renamed)
{
out_Renamed.Finish();
if (!out_Renamed.Empty)
{
SupportClass.PacketSupport packet = new SupportClass.PacketSupport(SupportClass.ToByteArray(out_Renamed.data), out_Renamed.off, new IPEndPoint(group, DNSConstants.MDNS_PORT));
try
{
DNSIncoming msg = new DNSIncoming(packet);
logger.Debug("send() JmDNS out:" + msg.Print(true));
}
catch (IOException e)
{
logger.Error("send(DNSOutgoing) - JmDNS can not parse what it sends!!!", e);
}
await SupportClass.UdpClientSupport.Send(socket, packet);
}
}
/// <summary> Parse a message from a datagram packet.</summary>
internal DNSIncoming(SupportClass.PacketSupport packet)
{
this.packet = packet;
this.data = SupportClass.ToSByteArray(packet.Data);
this.len = packet.Length;
// TODO: will this always be 0 in .NET??
this.off = 0;
this.questions = ArrayList.ReadOnly(new ArrayList());
this.answers = ArrayList.ReadOnly(new ArrayList());
this.receivedTime = (DateTime.Now.Ticks - 621355968000000000) / 10000;
try
{
id = ReadUnsignedShort();
flags = ReadUnsignedShort();
numQuestions = ReadUnsignedShort();
numAnswers = ReadUnsignedShort();
numAuthorities = ReadUnsignedShort();
numAdditionals = ReadUnsignedShort();
// parse questions
if (numQuestions > 0)
{
questions = ArrayList.Synchronized(new ArrayList(numQuestions));
for (int i = 0; i < numQuestions; i++)
{
DNSQuestion question = new DNSQuestion(ReadName(), ReadUnsignedShort(), ReadUnsignedShort());
questions.Add(question);
}
}
// parse answers
int n = numAnswers + numAuthorities + numAdditionals;
if (n > 0)
{
answers = ArrayList.Synchronized(new ArrayList(n));
for (int i = 0; i < n; i++)
{
string domain = ReadName();
int type = ReadUnsignedShort();
int clazz = ReadUnsignedShort();
int ttl = ReadInt();
int len = ReadUnsignedShort();
int end = off + len;
DNSRecord rec = null;
switch (type)
{
case DNSConstants.TYPE_A:
// IPv4
case DNSConstants.TYPE_AAAA: // IPv6 FIXME [PJYF Oct 14 2004] This has not been tested
rec = new Address(domain, type, clazz, ttl, ReadBytes(off, len));
break;
case DNSConstants.TYPE_CNAME:
case DNSConstants.TYPE_PTR:
rec = new Pointer(domain, type, clazz, ttl, ReadName());
break;
case DNSConstants.TYPE_TXT:
rec = new Text(domain, type, clazz, ttl, ReadBytes(off, len));
break;
case DNSConstants.TYPE_SRV:
rec = new Service(domain, type, clazz, ttl, ReadUnsignedShort(), ReadUnsignedShort(), ReadUnsignedShort(), ReadName());
break;
case DNSConstants.TYPE_HINFO:
// Maybe we should do something with those
break;
default:
logger.Debug("DNSIncoming() unknown type:" + type);
break;
}
if (rec != null)
{
// Add a record, if we were able to create one.
answers.Add(rec);
}
else
{
// Addjust the numbers for the skipped record
if (answers.Count < numAnswers)
{
numAnswers--;
}
else if (answers.Count < numAnswers + numAuthorities)
{
numAuthorities--;
}
else if (answers.Count < numAnswers + numAuthorities + numAdditionals)
{
numAdditionals--;
}
}
off = end;
}
}
}
catch (IOException e)
{
logger.Warn("DNSIncoming() dump " + Print(true) + "\n exception ", e);
throw e;
}
}
/// <summary> Parse a message from a datagram packet.</summary>
internal DNSIncoming(SupportClass.PacketSupport packet)
{
this.packet = packet;
this.data = SupportClass.ToSByteArray(packet.Data);
this.len = packet.Length;
// TODO: will this always be 0 in .NET??
this.off = 0;
this.questions = ArrayList.ReadOnly(new ArrayList());
this.answers = ArrayList.ReadOnly(new ArrayList());
this.receivedTime = (DateTime.Now.Ticks - 621355968000000000) / 10000;
try
{
id = ReadUnsignedShort();
flags = ReadUnsignedShort();
numQuestions = ReadUnsignedShort();
numAnswers = ReadUnsignedShort();
numAuthorities = ReadUnsignedShort();
numAdditionals = ReadUnsignedShort();
// parse questions
if (numQuestions > 0)
{
questions = ArrayList.Synchronized(new ArrayList(numQuestions));
for (int i = 0; i < numQuestions; i++)
{
DNSQuestion question = new DNSQuestion(ReadName(), ReadUnsignedShort(), ReadUnsignedShort());
questions.Add(question);
}
}
// parse answers
int n = numAnswers + numAuthorities + numAdditionals;
if (n > 0)
{
answers = ArrayList.Synchronized(new ArrayList(n));
for (int i = 0; i < n; i++)
{
string domain = ReadName();
int type = ReadUnsignedShort();
int clazz = ReadUnsignedShort();
int ttl = ReadInt();
int len = ReadUnsignedShort();
int end = off + len;
DNSRecord rec = null;
switch (type)
{
case DNSConstants.TYPE_A:
// IPv4
case DNSConstants.TYPE_AAAA: // IPv6 FIXME [PJYF Oct 14 2004] This has not been tested
rec = new Address(domain, type, clazz, ttl, ReadBytes(off, len));
break;
case DNSConstants.TYPE_CNAME:
case DNSConstants.TYPE_PTR:
rec = new Pointer(domain, type, clazz, ttl, ReadName());
break;
case DNSConstants.TYPE_TXT:
rec = new Text(domain, type, clazz, ttl, ReadBytes(off, len));
break;
case DNSConstants.TYPE_SRV:
rec = new Service(domain, type, clazz, ttl, ReadUnsignedShort(), ReadUnsignedShort(), ReadUnsignedShort(), ReadName());
break;
case DNSConstants.TYPE_HINFO:
// Maybe we should do something with those
break;
default:
logger.Debug("DNSIncoming() unknown type:" + type);
break;
}
if (rec != null)
{
// Add a record, if we were able to create one.
answers.Add(rec);
}
else
{
// Addjust the numbers for the skipped record
if (answers.Count < numAnswers)
{
numAnswers--;
}
else if (answers.Count < numAnswers + numAuthorities)
{
numAuthorities--;
}
else if (answers.Count < numAnswers + numAuthorities + numAdditionals)
{
numAdditionals--;
}
}
off = end;
}
}
}
catch (IOException e)
{
logger.Warn("DNSIncoming() dump " + Print(true) + "\n exception ", e);
throw e;
}
}
