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ServerContextImpl: bind to a single interface

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Allow config option EPICS_PVAS_INTF_ADDR_LIST specify a single
interface (multiple interfaces to be handled later)

Bind TCP listen and UDP sender to the interface address.
For non-windows, bind a second UDP socket to the interface
broadcast address.

Allow dynamic broadcast port
This commit is contained in:
Michael Davidsaver
2015-12-10 15:24:06 -05:00
parent 5d744dbebe
commit b3d58266a7
3 changed files with 66 additions and 10 deletions
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70
src/server/serverContext.cpp
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@@ -138,6 +138,11 @@ void ServerContextImpl::loadConfiguration()
if (debugLevel > 0)
SET_LOG_LEVEL(logLevelDebug);
_ifaceAddr.ia.sin_family = AF_INET;
_ifaceAddr.ia.sin_addr.s_addr = htonl(INADDR_ANY);
_ifaceAddr.ia.sin_port = 0;
config->getPropertyAsAddress("EPICS_PVAS_INTF_ADDR_LIST", &_ifaceAddr);
_beaconAddressList = config->getPropertyAsString("EPICS_PVA_ADDR_LIST", _beaconAddressList);
_beaconAddressList = config->getPropertyAsString("EPICS_PVAS_BEACON_ADDR_LIST", _beaconAddressList);
@@ -149,6 +154,7 @@ void ServerContextImpl::loadConfiguration()
_serverPort = config->getPropertyAsInteger("EPICS_PVA_SERVER_PORT", _serverPort);
_serverPort = config->getPropertyAsInteger("EPICS_PVAS_SERVER_PORT", _serverPort);
_ifaceAddr.ia.sin_port = htons(_serverPort);
_broadcastPort = config->getPropertyAsInteger("EPICS_PVA_BROADCAST_PORT", _broadcastPort);
_broadcastPort = config->getPropertyAsInteger("EPICS_PVAS_BROADCAST_PORT", _broadcastPort);
@@ -158,6 +164,21 @@ void ServerContextImpl::loadConfiguration()
_channelProviderNames = config->getPropertyAsString("EPICS_PVA_PROVIDER_NAMES", _channelProviderNames);
_channelProviderNames = config->getPropertyAsString("EPICS_PVAS_PROVIDER_NAMES", _channelProviderNames);
_ifaceBCast.ia.sin_family = AF_UNSPEC;
if(_ifaceAddr.ia.sin_addr.s_addr != htonl(INADDR_ANY)) {
ELLLIST alist = ELLLIST_INIT;
SOCKET sock = epicsSocketCreate(AF_INET, SOCK_STREAM, 0);
if(sock) {
osiSockDiscoverBroadcastAddresses(&alist, sock, &_ifaceAddr);
epicsSocketDestroy(sock);
}
if(ellCount(&alist)>0) {
osiSockAddrNode *node = (osiSockAddrNode*)ellFirst(&alist);
_ifaceBCast = node->addr;
}
ellFree(&alist);
}
}
bool ServerContextImpl::isChannelProviderNamePreconfigured()
@@ -246,7 +267,7 @@ void ServerContextImpl::internalInitialize()
ServerContextImpl::shared_pointer thisServerContext = shared_from_this();
_acceptor.reset(new BlockingTCPAcceptor(thisServerContext, thisServerContext, _serverPort, _receiveBufferSize));
_acceptor.reset(new BlockingTCPAcceptor(thisServerContext, thisServerContext, _ifaceAddr, _receiveBufferSize));
_serverPort = ntohs(_acceptor->getBindAddress()->ia.sin_port);
// setup broadcast UDP transport
@@ -265,7 +286,7 @@ void ServerContextImpl::initializeBroadcastTransport()
osiSockAddr listenLocalAddress;
listenLocalAddress.ia.sin_family = AF_INET;
listenLocalAddress.ia.sin_port = htons(_broadcastPort);
listenLocalAddress.ia.sin_addr.s_addr = htonl(INADDR_ANY);
listenLocalAddress.ia.sin_addr.s_addr = _ifaceAddr.ia.sin_addr.s_addr;
// where to send addresses
SOCKET socket = epicsSocketCreate(AF_INET, SOCK_STREAM, IPPROTO_TCP);
@@ -284,7 +305,36 @@ void ServerContextImpl::initializeBroadcastTransport()
nullTransportClient, responseHandler,
listenLocalAddress, PVA_PROTOCOL_REVISION,
PVA_DEFAULT_PRIORITY));
listenLocalAddress = *_broadcastTransport->getRemoteAddress();
_broadcastTransport->setSendAddresses(broadcastAddresses.get());
_broadcastPort = ntohs(listenLocalAddress.ia.sin_port);
#if !defined(_WIN32)
if(_ifaceAddr.ia.sin_addr.s_addr != htonl(INADDR_ANY)) {
if(_ifaceBCast.ia.sin_family == AF_UNSPEC ||
_ifaceBCast.ia.sin_addr.s_addr == listenLocalAddress.ia.sin_addr.s_addr) {
LOG(logLevelWarn, "Unable to find broadcast address of interface\n");
} else {
/* An oddness of BSD sockets (not winsock) is that binding to
* INADDR_ANY will receive unicast and broadcast, but binding to
* a specific interface address receives only unicast. The trick
* is to bind a second socket to the interface broadcast address,
* which will then receive only broadcasts.
*/
_ifaceBCast.ia.sin_port = listenLocalAddress.ia.sin_port;
responseHandler = createResponseHandler();
_broadcastTransport2 = static_pointer_cast<BlockingUDPTransport>(broadcastConnector->connect(
nullTransportClient, responseHandler,
_ifaceBCast, PVA_PROTOCOL_REVISION,
PVA_DEFAULT_PRIORITY));
/* The other wrinkle is that nothing should be sent from this second
* socket. So replies are made through the unicast socket.
*/
_broadcastTransport2->setReplyTransport(_broadcastTransport);
}
}
#endif
// set ignore address list
if (!_ignoreAddressList.empty())
@@ -324,7 +374,7 @@ void ServerContextImpl::initializeBroadcastTransport()
{
osiSockAddr group;
aToIPAddr("224.0.0.128", _broadcastPort, &group.ia);
_broadcastTransport->join(group, loAddr);
_broadcastTransport->join(group, _ifaceAddr);
osiSockAddr anyAddress;
anyAddress.ia.sin_family = AF_INET;
@@ -356,6 +406,8 @@ void ServerContextImpl::initializeBroadcastTransport()
}
_broadcastTransport->start();
if(_broadcastTransport2)
_broadcastTransport2->start();
if (_localMulticastTransport)
_localMulticastTransport->start();
}
@@ -455,11 +507,13 @@ void ServerContextImpl::destroy()
void ServerContextImpl::internalDestroy()
{
// stop responding to search requests
if (_broadcastTransport.get())
{
_broadcastTransport->close();
_broadcastTransport.reset();
}
if (_broadcastTransport)
_broadcastTransport->close();
if (_broadcastTransport2)
_broadcastTransport2->close();
_broadcastTransport.reset();
_broadcastTransport2.reset();
// and close local multicast transport
if (_localMulticastTransport.get())
{