[SNMP4J] - BER -> OID resolution i.e : snmpCommunityName
Frank Fock
fock at agentpp.com
Mon Jan 6 16:26:02 CET 2014
Hi Maurice,
SNMP4J-SMI 1.1 is ready for download now - if you have not recognized it
yet.
The examples below are not valid any more, because I had to change the
format
a little bit. See the SmiManager JavaDoc for the details:
http://www.snmp4j.org/smi/doc/com/snmp4j/smi/SmiManager.html
Best regards,
Frank
Am 04.01.2014 02:56, schrieb Frank Fock:
> Maurice,
>
> You got it right. The decoded index format without quotes that is
> currently
> implemented is not suitable for round-trip coding/decoding.
> The new (additional) format uses double quotes for non-implied length
> sub-indexes with variable length, DISPLAY-HINT, or enum label encoding.
> It uses single quotes for implied length non-numeric sub-index values.
>
> Some examples from the unit tests I wrote to verify the new format:
>
> OID vacmAccessContextMatch = new
> OID("1.3.6.1.6.3.16.1.4.1.4.7.118.51.103.114.111.117.112.0.3.1");
> assertEquals("vacmAccessContextMatch.'v3group'.''.3.'noAuthNoPriv(1)'", vacmAccessContextMatch.toString());
>
> assertEquals(vacmAccessContextMatch, new
> OID("vacmAccessContextMatch.'v3group'.''.3.'noAuthNoPriv(1)'"));
>
> OID vacmViewTreeFamilyMask = new
> OID("1.3.6.1.6.3.16.1.5.2.1.3.20.117.110.114.101.115.116.114.105.99.116.101.100.82.101.97.100.86.105.101.119.3.1.3.6");
> assertEquals("vacmViewTreeFamilyMask.'unrestrictedReadView'.'dod'",
> vacmViewTreeFamilyMask.toString());
>
> OID vacmViewTreeFamilyMask2 = new
> OID("1.3.6.1.6.3.16.1.5.2.1.3.20.117.110.114.101.115.116.114.105.99.116.101.100.82.101.97.100.86.105.101.119.4.1.3.6.4976");
> assertEquals("vacmViewTreeFamilyMask.'unrestrictedReadView'.'dod.4976'",
> vacmViewTreeFamilyMask2.toString());
>
> OID vacmViewTreeFamilyMask3 = new
> OID("1.3.6.1.6.3.16.1.5.2.1.3.20.117.110.114.101.115.116.114.105.99.116.101.100.82.101.97.100.86.105.101.119.4.9.3.6.4976");
> assertEquals("vacmViewTreeFamilyMask.'unrestrictedReadView'.'9.3.6.4976'",
> vacmViewTreeFamilyMask3.toString());
>
> Best regards,
> Frank
>
>
> Am 03.01.2014 16:28, schrieb Garcia, Maurice:
>>
>> Frank,
>>
>> Sorry for all the questions L
>>
>> One more related to this email trail...
>>
>> I implemented the change you suggested and now the OID is resolved:
>>
>> Output -> *vacmSecurityToGroupStatus.1.readwritesec*
>>
>> But when I reverse the process, it will not encode back to BER.
>>
>> OID 'vacmGroupName.1.readwritesec' cannot be parsed
>>
>> at org.snmp4j.smi.OID.parseDottedString(_OID.java:148_)
>>
>> at org.snmp4j.smi.OID.<init>(_OID.java:83_)
>>
>> at
>> com.comcast.cpe.cfb.ber.BERService.setOIDEncoding(_BERService.java:152_)
>>
>> I am not sure if this is related to the bug you found that will be
>> fixed in 1.0.2, but it appear to be the round-trip index conversion
>> that you were talking about?
>>
>> Thanks,
>>
>> Maurice
>>
>> *From:*Frank Fock [mailto:fock at agentpp.com]
>> *Sent:* Thursday, January 02, 2014 12:15 PM
>> *To:* Garcia, Maurice; snmp4j at agentpp.org
>> *Subject:* Re: [SNMP4J] - BER -> OID resolution i.e : snmpCommunityName
>>
>> Hi Maurice,
>>
>> OK, I understand.
>> To get the index decoded too, two steps are ncessary:
>>
>> 1. Set the OID format to:
>> smiManager.setOidFormat(SmiManager.OIDFormat.ObjectNameAndDecodedIndex);
>>
>> 2. Call oOID.format();
>>
>> While investigating this, I found two issues with SNMP4JSMI 1.0.1:
>>
>> 1. When activating the OID format OIDFormat.ObjectNameAndDecodedIndex
>> object names
>> of non-instance OIDs (i.e. objects in the MIB tree path like "mib-2")
>> will be decoded as
>> numeric OIDs only. This bug will be fixed with version 1.0.2 coming
>> very soon.
>>
>> 2. Currently "OID.toString()" will not return object names with
>> decoded index, because
>> such OIDs cannot be parsed and thus are not suitable for rountrip
>> conversion.
>> However, I think I have found a solution to be able to do round-trip
>> index conversion
>> and will implement it for version 1.0.2 too.
>>
>> Best regards,
>> Frank
>>
>> Am 02.01.2014 04:40, schrieb Garcia, Maurice:
>>
>> Thanks for the quick reponse!!
>>
>> I am using the SNMP4J-SMI with the purchased license.
>>
>> I used both the OID.format() and OID.toString, but I am getting
>> the same result.
>>
>> *if*(*true*) {
>>
>> System./out/.println("BEROIDConversion.getOidName() - BER: "+
>> *new*HexString(bBER).toString());
>>
>> System./out/.println("BEROIDConversion.getOidName() -
>> OID.toString(): "+ oOID.toString());
>>
>> System./out/.println("BEROIDConversion.getOidName() -
>> OID.format(): "+ oOID.format());
>>
>> }
>>
>> BEROIDConversion.getOidName() - BER: 30 1C 06 11 2B 06 01 06 03 12
>> 01 01 01 02 6D 74 61 70 72 6F 76 04 07 6D 74 61 5F 70 77 64
>>
>> BEROIDConversion.getOidName() - OID.toString():
>> snmpCommunityName.109.116.97.112.114.111.118
>>
>> BEROIDConversion.getOidName() - OID.format():
>> snmpCommunityName.109.116.97.112.114.111.118
>>
>> Am I doing something wrong, or is there more to the setup of SMI?
>>
>> Thanks,
>>
>> Maurice
>>
>> *From:*Frank Fock [mailto:fock at agentpp.com]
>> *Sent:* Wednesday, January 01, 2014 12:03 PM
>> *To:* Garcia, Maurice; snmp4j at agentpp.org
>> <mailto:snmp4j at agentpp.org>
>> *Subject:* Re: [SNMP4J] - BER -> OID resolution i.e :
>> snmpCommunityName
>>
>> Hi Maurice,
>>
>> I think the BER (Basic Encoding Rules) isn't the problem here.
>> The BER encodes/decodes a numeric object identifier (i.e., an
>> array of usinged 32bit integer values) to/from a network encoding
>> that is independent from the byte and word order of a system.
>>
>> What you are looking for is SNMP4J-SMI which provides
>> OID to object (last) name conversion and index to string
>> conversions.
>>
>> If you have SNMP4J-SMI in place, OID.toString() will provide
>> you the value you are looking for.
>>
>> Best regards,
>> Frank
>>
>> Am 31.12.2013 17:18, schrieb Garcia, Maurice:
>>
>> Hi,
>>
>> I am trying to fully resolve the *snmpCommunityName*OID from
>> BER to OID
>>
>> I tried using all the methods in the OID Class and can't find
>> anything in the SMI class that can help..
>>
>> Any suggestions???
>>
>> /_Example:_/
>>
>> I get this -> *snmpCommunityName.109.116.97.112.114.111.118*
>>
>> But I want this -> *snmpCommunityName.'mtaprov1'*
>>
>> *Thanks,*
>>
>> *Maurice*
>>
>>
>>
>>
>> --
>> ---
>>
>> AGENT++
>>
>> Maximilian-Kolbe-Str. 10
>>
>> 73257 Koengen, Germany
>>
>> https://agentpp.com
>>
>> Phone: +49 7024 8688230
>>
>> Fax: +49 7024 8688231
>>
>>
>>
>> --
>> ---
>> AGENT++
>> Maximilian-Kolbe-Str. 10
>> 73257 Koengen, Germany
>> https://agentpp.com
>> Phone: +49 7024 8688230
>> Fax: +49 7024 8688231
>
--
---
AGENT++
Maximilian-Kolbe-Str. 10
73257 Koengen, Germany
https://agentpp.com
Phone: +49 7024 8688230
Fax: +49 7024 8688231
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