/** Send a message to the address specified in dest */
void sendUdpMessage(Message msg) throws Exception {
IpAddress dest;
Message copy;
Event evt;
dest = (IpAddress) msg.getDest(); // guaranteed not to be null
setSourceAddress(msg);
if (Trace.debug) {
Trace.debug(
"UDP.sendUdpMessage()",
"sending message to "
+ msg.getDest()
+ " (src="
+ msg.getSrc()
+ "), headers are "
+ msg.getHeaders());
// Don't send if destination is local address. Instead, switch dst and src and put in
// up_queue.
// If multicast message, loopback a copy directly to us (but still multicast). Once we receive
// this,
// we will discard our own multicast message
}
if (loopback && (dest.equals(local_addr) || dest.isMulticastAddress())) {
copy = msg.copy();
copy.removeHeader(name);
copy.setSrc(local_addr);
copy.setDest(dest);
evt = new Event(Event.MSG, copy);
/* Because Protocol.up() is never called by this bottommost layer, we call up() directly in the observer.
This allows e.g. PerfObserver to get the time of reception of a message */
if (observer != null) {
observer.up(evt, up_queue.size());
}
if (Trace.debug) {
Trace.info("UDP.sendUdpMessage()", "looped back local message " + copy);
}
passUp(evt);
if (!dest.isMulticastAddress()) {
return;
}
}
if (use_outgoing_packet_handler) {
outgoing_queue.add(msg);
return;
}
send(msg);
}
void bundleAndSend() {
Map.Entry entry;
IpAddress dest;
ObjectOutputStream out;
InetAddress addr;
int port;
byte[] data;
List l;
if (Trace.trace) {
Trace.info(
"UDP.BundlingOutgoingPacketHandler.bundleAndSend()",
"\nsending msgs:\n" + dumpMessages(msgs));
}
synchronized (msgs) {
stopTimer();
if (msgs.size() == 0) {
return;
}
for (Iterator it = msgs.entrySet().iterator(); it.hasNext(); ) {
entry = (Map.Entry) it.next();
dest = (IpAddress) entry.getKey();
addr = dest.getIpAddress();
port = dest.getPort();
l = (List) entry.getValue();
try {
out_stream.reset();
// BufferedOutputStream bos=new BufferedOutputStream(out_stream);
out_stream.write(Version.version_id, 0, Version.version_id.length); // write the version
// bos.write(Version.version_id, 0, Version.version_id.length); // write the version
out = new ObjectOutputStream(out_stream);
// out=new ObjectOutputStream(bos);
l.writeExternal(out);
out.close(); // needed if out buffers its output to out_stream
data = out_stream.toByteArray();
doSend(data, addr, port);
} catch (IOException e) {
Trace.error(
"UDP.BundlingOutgoingPacketHandle.bundleAndSend()",
"exception sending msg (to dest=" + dest + "): " + e);
}
}
msgs.clear();
}
}
void handleMessage(Message msg) {
Event evt;
UdpHeader hdr;
// discard my own multicast loopback copy
if (loopback) {
Address dst = msg.getDest();
Address src = msg.getSrc();
if (dst != null && dst.isMulticastAddress() && src != null && local_addr.equals(src)) {
if (Trace.debug) {
Trace.info("UDP.handleMessage()", "discarded own loopback multicast packet");
}
return;
}
}
evt = new Event(Event.MSG, msg);
if (Trace.debug) {
Trace.info("UDP.handleMessage()", "message is " + msg + ", headers are " + msg.getHeaders());
/* Because Protocol.up() is never called by this bottommost layer, we call up() directly in the observer.
* This allows e.g. PerfObserver to get the time of reception of a message */
}
if (observer != null) {
observer.up(evt, up_queue.size());
}
hdr = (UdpHeader) msg.removeHeader(name);
if (hdr != null) {
/* Discard all messages destined for a channel with a different name */
String ch_name = null;
if (hdr.group_addr != null) {
ch_name = hdr.group_addr;
// Discard if message's group name is not the same as our group name unless the
// message is a diagnosis message (special group name DIAG_GROUP)
}
if (ch_name != null
&& group_addr != null
&& !group_addr.equals(ch_name)
&& !ch_name.equals(Util.DIAG_GROUP)) {
if (Trace.trace) {
Trace.warn(
"UDP.handleMessage()",
"discarded message from different group ("
+ ch_name
+ "). Sender was "
+ msg.getSrc());
}
return;
}
} else {
Trace.error("UDP.handleMessage()", "message does not have a UDP header");
}
passUp(evt);
}
void closeMulticastSocket() {
if (mcast_sock != null) {
try {
if (mcast_addr != null) {
// by sending a dummy packet the thread will be awakened
sendDummyPacket(mcast_addr.getIpAddress(), mcast_addr.getPort());
Util.sleep(300);
mcast_sock.leaveGroup(mcast_addr.getIpAddress());
}
mcast_sock.close(); // this will cause the mcast receiver thread to break out of its loop
mcast_sock = null;
if (Trace.trace) {
Trace.info("UDP.closeMulticastSocket()", "multicast socket closed");
}
} catch (IOException ex) {
}
mcast_addr = null;
}
}
/**
* Create UDP sender and receiver sockets. Currently there are 2 sockets (sending and receiving).
* This is due to Linux's non-BSD compatibility in the JDK port (see DESIGN).
*/
void createSockets() throws Exception {
InetAddress tmp_addr = null;
// bind_addr not set, try to assign one by default. This is needed on Windows
// changed by bela Feb 12 2003: by default multicast sockets will be bound to all network
// interfaces
// CHANGED *BACK* by bela March 13 2003: binding to all interfaces did not result in a correct
// local_addr. As a matter of fact, comparison between e.g. 0.0.0.0:1234 (on hostA) and
// 0.0.0.0:1.2.3.4 (on hostB) would fail !
if (bind_addr == null) {
InetAddress[] interfaces =
InetAddress.getAllByName(InetAddress.getLocalHost().getHostAddress());
if (interfaces != null && interfaces.length > 0) bind_addr = interfaces[0];
}
if (bind_addr == null) bind_addr = InetAddress.getLocalHost();
if (bind_addr != null && Trace.trace) {
Trace.info(
"UDP.createSockets()",
"unicast sockets will use interface " + bind_addr.getHostAddress());
// 2. Create socket for receiving unicast UDP packets. The address and port
// of this socket will be our local address (local_addr)
// 27-6-2003 bgooren, find available port in range (start_port, start_port+port_range)
}
int rcv_port = bind_port, max_port = bind_port + port_range;
while (rcv_port <= max_port) {
try {
sock = new DatagramSocket(rcv_port, bind_addr);
break;
} catch (SocketException bind_ex) { // Cannot listen on this port
rcv_port++;
} catch (SecurityException sec_ex) { // Not allowed to list on this port
rcv_port++;
}
// Cannot listen at all, throw an Exception
if (rcv_port == max_port + 1) { // +1 due to the increment above
throw new Exception(
"UDP.createSockets(): cannot list on any port in range "
+ bind_port
+ "-"
+ (bind_port + port_range));
}
}
// ucast_recv_sock=new DatagramSocket(bind_port, bind_addr);
if (sock == null) {
throw new Exception("UDP.createSocket(): sock is null");
}
local_addr = new IpAddress(sock.getLocalAddress(), sock.getLocalPort());
if (additional_data != null) {
local_addr.setAdditionalData(additional_data);
// 3. Create socket for receiving IP multicast packets
}
if (ip_mcast) {
mcast_sock = new MulticastSocket(mcast_port);
mcast_sock.setTimeToLive(ip_ttl);
if (bind_addr != null) {
mcast_sock.setInterface(bind_addr);
}
tmp_addr = InetAddress.getByName(mcast_addr_name);
mcast_addr = new IpAddress(tmp_addr, mcast_port);
mcast_sock.joinGroup(tmp_addr);
}
setBufferSizes();
if (Trace.trace) {
Trace.info("UDP.createSockets()", "socket information:\n" + dumpSocketInfo());
}
}
/** Internal method to serialize and send a message. This method is not reentrant */
void send(Message msg) throws Exception {
IpAddress dest = (IpAddress) msg.getDest();
byte[] buf = messageToBuffer(msg);
doSend(buf, dest.getIpAddress(), dest.getPort());
}
