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Id: 131496
Status: new
Priority: 0/
Queue: Net-SNMP

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Owner: Nobody in particular
Requestors: JQueiroz [...] mpf.mp.br
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Subject: Calling method "get_entries" with inaccessible column in list does not report error
Date: Thu, 16 Jan 2020 19:00:15 -0300
To: <bug-Net-SNMP [...] rt.cpan.org>
From: "José Queiroz (PR.RJ)" <JQueiroz [...] mpf.mp.br>
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Hi, I was studying the use of Net::SNMP to retrieve LLDP data from devices, and saw that, given "$session" is a valid session handle, opened with Net::SNMP->open_session(), with a valid hostname, version and community (thus giving otherwise valid results): 1. If I call "get_entries()" with a list compound of an unaccessible element, it gives me an error, as in $result = $snmp->get_entries( -columns=>[ '1.0.8802.1.1.2.1.4.1.1.2'] ) # lldpRemLocalPortNum (not-accessible) In this case, $result returns undef and $snmp->error() indicates that "The requested entries are empty or do not exist", as expected. 2. If I call "get_entries()" with a list of accessible elements and an unaccessible element, it doesn't gives me an error, as in: # lldpRemSysName (r/o), lldpRemChassisID (r/o), lldpRemPortId (r/o), lldpRemLocalPortNum (n/a) $result = $snmp->get_entries( -columns=>[ '1.0.8802.1.1.2.1.4.1.1.9', '1.0.8802.1.1.2.1.4.1.1.5', '1.0.8802.1.1.2.1.4.1.1.7', '1.0.8802.1.1.2.1.4.1.1.2'] ); In this case, $result returns a valid object, with the contents of three first valid columns, thus ignoring the invalid/empty column. 3. If I call "get_entries() with the same list above, but placing the invalid/unaccessible column first, it doesn't gives me an error, as in: # lldpRemLocalPortNum (n/a), lldpRemSysName (r/o), lldpRemChassisID (r/o), lldpRemPortId (r/o) $result = $snmp->get_entries( -columns=>[ '1.0.8802.1.1.2.1.4.1.1.2', '1.0.8802.1.1.2.1.4.1.1.9', '1.0.8802.1.1.2.1.4.1.1.5', '1.0.8802.1.1.2.1.4.1.1.7'] ); In this case, not only the same above occurs (no error reported), as also invalid OID keys (space terminated) are found in %$result hash. This happens with different, otherwise valid, devices. I'm using perl 5.26.1, (K)ubuntu 18.04 bionic 64bits, and Net::SNMP 6.0.1. Hope this information is enough. Thanks for your attention, José Queiroz -------------------------------------------------------------- Não alimente os trolls http://br-linux.org/noticias/002750.html


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