Hi Gianluca,
This is indeed a bug. Although it has no security
relevance, it has regarding authenticationFailure
trap generation and counter incrementation.
The below patch fixes it:
Index: SnmpCommunityMIB.java
===================================================================
--- SnmpCommunityMIB.java (revision 1664)
+++ SnmpCommunityMIB.java (working copy)
@@ -543,8 +543,10 @@
if (coexistenceInfo == null) {
return null;
}
- SortedSet cinfos = new
TreeSet((SortedSet)coexistenceInfo.get(community));
+ SortedSet cinfos = (SortedSet)coexistenceInfo.get(community);
if (cinfos != null) {
+ // make a copy to improve consistency on concurrent access
+ cinfos = new TreeSet(cinfos);
Iterator it = cinfos.iterator();
CoexistenceInfo[] infos = new CoexistenceInfo[cinfos.size()];
for (int i=0; i<infos.length; i++) {
Best regards,
Frank
Gianluca Uberti wrote:
> Hi there,
> I am trying to develop an SNMP agent capable of responding to V1 and V2c
> requests with the help of SNMP 4J Agent framework version 1.3.2;
> my community string is configured as "public"; any time the agent
> receives a V2c GET request with a community string different from
> "public", it hangs and the following exception is logged:
>
> 20091202 173258 CET [ERROR] <DefaultUDPTransportMapping> PTMA0000:
> java.lang.NullPointerException
> Trace for the exception:
> java.lang.NullPointerException
> at java.util.TreeSet.<init>(TreeSet.java:154)
> at
> org.snmp4j.agent.mo.snmp.SnmpCommunityMIB.getCoexistenceInfo(SnmpCommunityMIB.java:546)
> at
> org.snmp4j.agent.CommandProcessor.processPdu(CommandProcessor.java:116)
> at
> org.snmp4j.MessageDispatcherImpl.fireProcessPdu(MessageDispatcherImpl.java:610)
> at
> org.snmp4j.MessageDispatcherImpl.dispatchMessage(MessageDispatcherImpl.java:287)
> at
> org.snmp4j.MessageDispatcherImpl.processMessage(MessageDispatcherImpl.java:347)
> at
> org.snmp4j.MessageDispatcherImpl.processMessage(MessageDispatcherImpl.java:309)
> at
> org.snmp4j.transport.AbstractTransportMapping.fireProcessMessage(AbstractTransportMapping.java:83)
> at
> org.snmp4j.transport.DefaultUdpTransportMapping$ListenThread.run(DefaultUdpTransportMapping.java:364)
> at java.lang.Thread.run(Thread.java:619)
>
> It does seem to me an actual SNMP 4J Agent framework issue...any help is
> appreciated.
>
> Kind regards
>
> GL
>
> --
> Gianluca Uberti
> Kernel SW Engineer
> Mycom France s.a.r.l.
> t: +33 1 49 03 77 48
> f: +33 1 47 73 06 51
> e: [email protected]
> w: www.mycom-int.com
>
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