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local multicast revised for multiple NIF (server side only)

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This commit is contained in:
Matej Sekoranja
2015-12-31 11:18:49 +01:00
parent 52161dff60
commit 63a0c71fe9
7 changed files with 227 additions and 42 deletions
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64
src/server/serverContext.cpp
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@@ -291,6 +291,14 @@ void ServerContextImpl::initializeBroadcastTransport()
THROW_BASE_EXCEPTION("Failed to initialize broadcast UDP transport");
}
auto_ptr<InetAddrVector> broadcastAddresses(getBroadcastAddresses(socket,_broadcastPort));
int ifIndex = discoverInterfaceIndex(socket, &listenLocalAddress);
if (ifIndex == -1)
{
LOG(logLevelWarn, "Unable to find interface index for %s.", inetAddressToString(listenLocalAddress, false).c_str());
// TODO fallback
}
epicsSocketDestroy(socket);
TransportClient::shared_pointer nullTransportClient;
@@ -360,50 +368,48 @@ void ServerContextImpl::initializeBroadcastTransport()
}
// setup local broadcasting
//
// Setup local broadcasting
//
// Each network interface gets its own multicast group on a local interface.
// Multicast address is determined by prefix 224.0.0.124 + NIF index
//
// TODO configurable local NIF, address
osiSockAddr loAddr;
getLoopbackNIF(loAddr, "", 0);
osiSockAddr group;
int lastAddr = 128 + ifIndex;
std::ostringstream o;
// TODO configurable prefix and base
o << "224.0.0." << lastAddr;
aToIPAddr(o.str().c_str(), _broadcastPort, &group.ia);
_broadcastTransport->setMutlicastNIF(loAddr, true);
_broadcastTransport->setLocalMulticastAddress(group);
if (true)
{
try
{
osiSockAddr group;
// TODO there should be different mcast groups
// one for all interfaces, and then one per interface
// if received on specific NIF, then it's resent to speicfic mcast address
// if received on any NIF, then it should be resent to specific mcast address (calculate from receive from and mask)
// if interested for all the NIFs, then it should join to all specific mcast addresses
// --- server
// UDP bind on broadcast port + mcast as above
// -- client
// UDP bind to broadcast port + mcast as above
aToIPAddr("224.0.0.128", _broadcastPort, &group.ia);
_broadcastTransport->join(group, _ifaceAddr);
osiSockAddr anyAddress;
anyAddress.ia.sin_family = AF_INET;
anyAddress.ia.sin_port = htons(0);
anyAddress.ia.sin_addr.s_addr = htonl(INADDR_ANY);
// NOTE: localMulticastTransport is not started (no read is called on a socket)
// NOTE: multicast receiver socket must be "bound" to INADDR_ANY or multicast address
_localMulticastTransport = static_pointer_cast<BlockingUDPTransport>(broadcastConnector->connect(
nullTransportClient, _responseHandler,
anyAddress, PVA_PROTOCOL_REVISION,
group, PVA_PROTOCOL_REVISION,
PVA_DEFAULT_PRIORITY));
_localMulticastTransport->join(group, loAddr);
/* used for sending
_localMulticastTransport->setMutlicastNIF(loAddr, true);
InetAddrVector sendAddressList;
sendAddressList.push_back(group);
_localMulticastTransport->setSendAddresses(&sendAddressList);
*/
LOG(logLevelDebug, "Local multicast enabled on %s using network interface %s.",
inetAddressToString(group).c_str(), inetAddressToString(loAddr, false).c_str());
LOG(logLevelDebug, "Local multicast for %s enabled on %s/%s.",
inetAddressToString(listenLocalAddress, false).c_str(),
inetAddressToString(loAddr, false).c_str(),
inetAddressToString(group).c_str());
}
catch (std::exception& ex)
{