Nicholas Hughes created NIFI-5445:
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Summary: ListenTCP does not allow binding to subinterfaces
Key: NIFI-5445
URL: https://issues.apache.org/jira/browse/NIFI-5445
Project: Apache NiFi
Issue Type: Bug
Reporter: Nicholas Hughes
While attempting to bind ListenTCP to a certain interface, it was discovered
that it does not support subinterfaces (virtual interfaces) while validating
the contents of the "Local Network Interface" property. I traced it back to the
ListenerProperties class [1], which uses
"NetworkInterface.getNetworkInterfaces()" to pull a list of interfaces. This
method does not include subinterfaces, so further iteration using the
"getSubInterfaces()" method [2] on each interface would be required to fully
populate the list.
However, IP addresses are not found on the subinterfaces when using
"getInetAddresses()" on each interface. Instead, they can be found in the
enumeration returned by the parent interface. Further (needlessly complex)
logic would be required to determine which IP address is being requested when
specifying a virtual interface.
In a scenario where someone has assigned a virtual interface on a host and
entered the parent interface into the "Local Network Interface" property for
ListenTCP, the code will find multiple IP addresses for that parent
interface... but only select the first one in the list. [3] I'm uncertain as to
how the IP addresses are ordered in the returned enumeration, but I suspect
that unpredictable outcomes would result based upon that ordering.
Since this logic resides in the abstract class, multiple Listen processors are
affected.
[1]
[https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-extension-utils/nifi-processor-utils/src/main/java/org/apache/nifi/processor/util/listen/ListenerProperties.java#L41]
[2]
[https://docs.oracle.com/javase/8/docs/api/java/net/NetworkInterface.html#getSubInterfaces--]
[3]
[https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-extension-utils/nifi-processor-utils/src/main/java/org/apache/nifi/processor/util/listen/AbstractListenEventProcessor.java#L189]
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