com.zeroc.IceInternal.UdpTransceiver Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of ice Show documentation
Show all versions of ice Show documentation
Ice is a comprehensive RPC framework that helps you build distributed applications with minimal effort using familiar object-oriented idioms
//
// Copyright (c) ZeroC, Inc. All rights reserved.
//
package com.zeroc.IceInternal;
final class UdpTransceiver implements Transceiver
{
@Override
public java.nio.channels.SelectableChannel fd()
{
assert(_fd != null);
return _fd;
}
@Override
public void setReadyCallback(ReadyCallback callback)
{
}
@Override
public int initialize(Buffer readBuffer, Buffer writeBuffer)
{
//
// Nothing to do.
//
return SocketOperation.None;
}
@Override
public int closing(boolean initiator, com.zeroc.Ice.LocalException ex)
{
//
// Nothing to do.
//
return SocketOperation.None;
}
@Override
public void close()
{
assert(_fd != null);
try
{
_fd.close();
}
catch(java.io.IOException ex)
{
}
_fd = null;
}
@Override
public EndpointI bind()
{
if(_addr.getAddress().isMulticastAddress())
{
Network.setReuseAddress(_fd, true);
_mcastAddr = _addr;
if(System.getProperty("os.name").startsWith("Windows"))
{
//
// Windows does not allow binding to the mcast address itself
// so we bind to INADDR_ANY (0.0.0.0) instead. As a result,
// bi-directional connection won't work because the source
// address won't be the multicast address and the client will
// therefore reject the datagram.
//
int protocolSupport = Network.getProtocolSupport(_mcastAddr);
_addr = Network.getAddressForServer("", _port, protocolSupport, _instance.preferIPv6());
}
_addr = Network.doBind(_fd, _addr);
if(_port == 0)
{
_mcastAddr = new java.net.InetSocketAddress(_mcastAddr.getAddress(), _addr.getPort());
}
Network.setMcastGroup(_fd, _mcastAddr, _mcastInterface);
}
else
{
if(!System.getProperty("os.name").startsWith("Windows"))
{
//
// Enable SO_REUSEADDR on Unix platforms to allow
// re-using the socket even if it's in the TIME_WAIT
// state. On Windows, this doesn't appear to be
// necessary and enabling SO_REUSEADDR would actually
// not be a good thing since it allows a second
// process to bind to an address even it's already
// bound by another process.
//
// TODO: using SO_EXCLUSIVEADDRUSE on Windows would
// probably be better but it's only supported by recent
// Windows versions (XP SP2, Windows Server 2003).
//
Network.setReuseAddress(_fd, true);
}
_addr = Network.doBind(_fd, _addr);
}
_bound = true;
_endpoint = _endpoint.endpoint(this);
return _endpoint;
}
@Override
public int write(Buffer buf)
{
if(!buf.b.hasRemaining())
{
return SocketOperation.None;
}
assert(buf.b.position() == 0);
assert(_fd != null && _state >= StateConnected);
// The caller is supposed to check the send size before by calling checkSendSize
assert(java.lang.Math.min(_maxPacketSize, _sndSize - _udpOverhead) >= buf.size());
int ret = 0;
while(true)
{
try
{
if(_state == StateConnected)
{
ret = _fd.write(buf.b);
}
else
{
if(_peerAddr == null)
{
throw new com.zeroc.Ice.SocketException(); // No peer has sent a datagram yet.
}
ret = _fd.send(buf.b, _peerAddr);
}
break;
}
catch(java.nio.channels.AsynchronousCloseException ex)
{
throw new com.zeroc.Ice.ConnectionLostException(ex);
}
catch(java.net.PortUnreachableException ex)
{
throw new com.zeroc.Ice.ConnectionLostException(ex);
}
catch(java.io.InterruptedIOException ex)
{
continue;
}
catch(java.io.IOException ex)
{
throw new com.zeroc.Ice.SocketException(ex);
}
}
if(ret == 0)
{
return SocketOperation.Write;
}
assert(ret == buf.b.limit());
buf.position(buf.b.limit());
return SocketOperation.None;
}
@Override
public int read(Buffer buf)
{
if(!buf.b.hasRemaining())
{
return SocketOperation.None;
}
assert(buf.b.position() == 0);
final int packetSize = java.lang.Math.min(_maxPacketSize, _rcvSize - _udpOverhead);
buf.resize(packetSize, true);
buf.position(0);
int ret = 0;
while(true)
{
try
{
java.net.SocketAddress peerAddr = _fd.receive(buf.b);
if(peerAddr == null || buf.b.position() == 0)
{
return SocketOperation.Read;
}
_peerAddr = (java.net.InetSocketAddress)peerAddr;
ret = buf.b.position();
break;
}
catch(java.nio.channels.AsynchronousCloseException ex)
{
throw new com.zeroc.Ice.ConnectionLostException(ex);
}
catch(java.net.PortUnreachableException ex)
{
throw new com.zeroc.Ice.ConnectionLostException(ex);
}
catch(java.io.InterruptedIOException ex)
{
continue;
}
catch(java.io.IOException ex)
{
throw new com.zeroc.Ice.ConnectionLostException(ex);
}
}
if(_state == StateNeedConnect)
{
//
// If we must connect, we connect to the first peer that sends us a packet.
//
Network.doConnect(_fd, _peerAddr, null);
_state = StateConnected;
if(_instance.traceLevel() >= 1)
{
String s = "connected " + _instance.protocol() + " socket\n" + toString();
_instance.logger().trace(_instance.traceCategory(), s);
}
}
buf.resize(ret, true);
buf.position(ret);
return SocketOperation.None;
}
@Override
public String protocol()
{
return _instance.protocol();
}
@Override
public String toString()
{
if(_fd == null)
{
return "";
}
String s;
if(_incoming && !_bound)
{
s = "local address = " + Network.addrToString(_addr);
}
else if(_state == StateNotConnected)
{
java.net.DatagramSocket socket = _fd.socket();
s = "local address = " + Network.addrToString((java.net.InetSocketAddress)socket.getLocalSocketAddress());
if(_peerAddr != null)
{
s += "\nremote address = " + Network.addrToString(_peerAddr);
}
}
else
{
s = Network.fdToString(_fd);
}
if(_mcastAddr != null)
{
s += "\nmulticast address = " + Network.addrToString(_mcastAddr);
}
return s;
}
@Override
public String toDetailedString()
{
StringBuilder s = new StringBuilder(toString());
java.util.List intfs;
if(_mcastAddr == null)
{
intfs = Network.getHostsForEndpointExpand(_addr.getAddress().getHostAddress(), _instance.protocolSupport(),
true);
}
else
{
intfs = Network.getInterfacesForMulticast(_mcastInterface, Network.getProtocolSupport(_mcastAddr));
}
if(!intfs.isEmpty())
{
s.append("\nlocal interfaces = ");
s.append(com.zeroc.IceUtilInternal.StringUtil.joinString(intfs, ", "));
}
return s.toString();
}
@Override
public com.zeroc.Ice.ConnectionInfo getInfo()
{
com.zeroc.Ice.UDPConnectionInfo info = new com.zeroc.Ice.UDPConnectionInfo();
if(_fd != null)
{
java.net.DatagramSocket socket = _fd.socket();
info.localAddress = socket.getLocalAddress().getHostAddress();
info.localPort = socket.getLocalPort();
if(_state == StateNotConnected)
{
if(_peerAddr != null)
{
info.remoteAddress = _peerAddr.getAddress().getHostAddress();
info.remotePort = _peerAddr.getPort();
}
}
else
{
if(socket.getInetAddress() != null)
{
info.remoteAddress = socket.getInetAddress().getHostAddress();
info.remotePort = socket.getPort();
}
}
if(!socket.isClosed())
{
info.rcvSize = Network.getRecvBufferSize(_fd);
info.sndSize = Network.getSendBufferSize(_fd);
}
}
if(_mcastAddr != null)
{
info.mcastAddress = _mcastAddr.getAddress().getHostAddress();
info.mcastPort = _mcastAddr.getPort();
}
return info;
}
@Override
public synchronized void checkSendSize(Buffer buf)
{
//
// The maximum packetSize is either the maximum allowable UDP packet size, or
// the UDP send buffer size (which ever is smaller).
//
final int packetSize = java.lang.Math.min(_maxPacketSize, _sndSize - _udpOverhead);
if(packetSize < buf.size())
{
throw new com.zeroc.Ice.DatagramLimitException("message size of " + buf.size() +
" exceeds the maximum packet size of " + packetSize);
}
}
@Override
public synchronized void setBufferSize(int rcvSize, int sndSize)
{
setBufSize(rcvSize, sndSize);
}
public final int effectivePort()
{
return _addr.getPort();
}
//
// Only for use by UdpEndpoint
//
UdpTransceiver(ProtocolInstance instance, java.net.InetSocketAddress addr, java.net.InetSocketAddress sourceAddr,
String mcastInterface, int mcastTtl)
{
_instance = instance;
_state = StateNeedConnect;
_addr = addr;
try
{
_fd = Network.createUdpSocket(_addr);
setBufSize(-1, -1);
Network.setBlock(_fd, false);
//
// NOTE: setting the multicast interface before performing the
// connect is important for some OS such as macOS.
//
if(_addr.getAddress().isMulticastAddress())
{
if(mcastInterface.length() > 0)
{
Network.setMcastInterface(_fd, mcastInterface);
}
if(mcastTtl != -1)
{
Network.setMcastTtl(_fd, mcastTtl);
}
}
Network.doConnect(_fd, _addr, sourceAddr);
_state = StateConnected; // We're connected now
}
catch(com.zeroc.Ice.LocalException ex)
{
_fd = null;
throw ex;
}
}
//
// Only for use by UdpEndpoint
//
UdpTransceiver(UdpEndpointI endpoint, ProtocolInstance instance, java.net.InetSocketAddress addr,
String mcastInterface, boolean connect)
{
_endpoint = endpoint;
_instance = instance;
_state = connect ? StateNeedConnect : StateNotConnected;
_mcastInterface = mcastInterface;
_incoming = true;
_addr = addr;
_port = addr.getPort();
try
{
_fd = Network.createUdpSocket(_addr);
setBufSize(-1, -1);
Network.setBlock(_fd, false);
}
catch(com.zeroc.Ice.LocalException ex)
{
_fd = null;
throw ex;
}
}
private void setBufSize(int rcvSize, int sndSize)
{
assert(_fd != null);
for(int i = 0; i < 2; ++i)
{
boolean isSnd;
String direction;
String prop;
int dfltSize;
int sizeRequested;
if(i == 0)
{
isSnd = false;
direction = "receive";
prop = "Ice.UDP.RcvSize";
dfltSize = Network.getRecvBufferSize(_fd);
sizeRequested = rcvSize;
_rcvSize = dfltSize;
}
else
{
isSnd = true;
direction = "send";
prop = "Ice.UDP.SndSize";
dfltSize = Network.getSendBufferSize(_fd);
sizeRequested = sndSize;
_sndSize = dfltSize;
}
//
// Get property for buffer size if size not passed in.
//
if(sizeRequested == -1)
{
sizeRequested = _instance.properties().getPropertyAsIntWithDefault(prop, dfltSize);
}
//
// Check for sanity.
//
if(sizeRequested < (_udpOverhead + Protocol.headerSize))
{
_instance.logger().warning("Invalid " + prop + " value of " + sizeRequested + " adjusted to " +
dfltSize);
sizeRequested = dfltSize;
}
if(sizeRequested != dfltSize)
{
//
// Try to set the buffer size. The kernel will silently adjust
// the size to an acceptable value. Then read the size back to
// get the size that was actually set.
//
int sizeSet;
if(i == 0)
{
Network.setRecvBufferSize(_fd, sizeRequested);
_rcvSize = Network.getRecvBufferSize(_fd);
sizeSet = _rcvSize;
}
else
{
Network.setSendBufferSize(_fd, sizeRequested);
_sndSize = Network.getSendBufferSize(_fd);
sizeSet = _sndSize;
}
//
// Warn if the size that was set is less than the requested size
// and we have not already warned
//
if(sizeSet < sizeRequested)
{
BufSizeWarnInfo winfo = _instance.getBufSizeWarn(com.zeroc.Ice.UDPEndpointType.value);
if((isSnd && (!winfo.sndWarn || winfo.sndSize != sizeRequested)) ||
(!isSnd && (!winfo.rcvWarn || winfo.rcvSize != sizeRequested)))
{
_instance.logger().warning("UDP " + direction + " buffer size: requested size of "
+ sizeRequested + " adjusted to " + sizeSet);
if(isSnd)
{
_instance.setSndBufSizeWarn(com.zeroc.Ice.UDPEndpointType.value, sizeRequested);
}
else
{
_instance.setRcvBufSizeWarn(com.zeroc.Ice.UDPEndpointType.value, sizeRequested);
}
}
}
}
}
}
@SuppressWarnings("deprecation")
@Override
protected synchronized void finalize()
throws Throwable
{
try
{
com.zeroc.IceUtilInternal.Assert.FinalizerAssert(_fd == null);
}
catch(java.lang.Exception ex)
{
}
finally
{
super.finalize();
}
}
private UdpEndpointI _endpoint = null;
private ProtocolInstance _instance;
private int _state;
private int _rcvSize;
private int _sndSize;
private java.nio.channels.DatagramChannel _fd;
private java.net.InetSocketAddress _addr;
private java.net.InetSocketAddress _mcastAddr = null;
private String _mcastInterface;
private java.net.InetSocketAddress _peerAddr = null;
private boolean _incoming = false;
private int _port = 0;
private boolean _bound = false;
//
// The maximum IP datagram size is 65535. Subtract 20 bytes for the IP header and 8 bytes for the UDP header
// to get the maximum payload.
//
private final static int _udpOverhead = 20 + 8;
private final static int _maxPacketSize = 65535 - _udpOverhead;
private static final int StateNeedConnect = 0;
private static final int StateConnected = 1;
private static final int StateNotConnected = 2;
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy