Failure to set IP_MULTICAST_IF should be fatal

https://epics.anl.gov/core-talk/2022/msg00456.php

Mentions #93 as fixing an "escape" of 224.0.0.128 multicast traffic which should be limited to the loopback interface. A more complete fix should treat failure to set IP_MULTICAST_IF as a fatal error. Instead, currently a message is logged, and the socket is used anyway.

epicsCoreJava/pvAccessJava/src/org/epics/pvaccess/client/impl/remote/ClientContextImpl.java

Lines 461 to 473 in 3a32ca5

    
           try { 
        
           	InetAddress group = InetAddress.getByName("224.0.0.128"); 
        
           	localBroadcastAddress = new InetSocketAddress(group, broadcastPort); 
        
           	searchTransport.join(group, localNIF); 
        
           	// NOTE: this disables usage of multicast addresses in EPICS_PVA_ADDR_LIST 
        
           	searchTransport.setMutlicastNIF(localNIF, true); 
        
           	logger.config("Local multicast enabled on " + localBroadcastAddress + ":" + broadcastPort 
        
           			+ " using " + localNIF.getDisplayName() + "."); 
        
           } catch (Exception th) { 
        
           	logger.log(Level.CONFIG, "Failed to initialize local multicast, funcionality disabled.", th); 
        
           }

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Failure to set `IP_MULTICAST_IF` should be fatal #129

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	try {
	InetAddress group = InetAddress.getByName("224.0.0.128");
	localBroadcastAddress = new InetSocketAddress(group, broadcastPort);
	searchTransport.join(group, localNIF);

	// NOTE: this disables usage of multicast addresses in EPICS_PVA_ADDR_LIST
	searchTransport.setMutlicastNIF(localNIF, true);

	logger.config("Local multicast enabled on " + localBroadcastAddress + ":" + broadcastPort
	+ " using " + localNIF.getDisplayName() + ".");
	} catch (Exception th) {
	logger.log(Level.CONFIG, "Failed to initialize local multicast, funcionality disabled.", th);
	}

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Failure to set IP_MULTICAST_IF should be fatal #129

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Failure to set `IP_MULTICAST_IF` should be fatal #129