laurent

Laurent de Moussac CS 6255 Fall 2001

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Writing a Java MIB browser : Using introduced concepts Different tools (ANTLR, JDMK…)

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MIB Browser Application

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SMICNG

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SMICNG : 

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Converts RFC to a specific format (MOSY)

ANTLR

Parser, creates data structures

Application in Java JDMK : 

Java Application GUI swing

Java Dynamic Management Kit JDMK

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Useful tool to create lexers, parsers, AST walkers in Java (or in C) High level language, avoid the low level parsing utilities Rules using RegExp Lexer and Parser

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Sun Toolkit Agents and Managers Provides an API for accessing :   

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SNMP HTTP, HTTPS, RMI Scheduling, Monitoring

Architecture independent (Java !) MIB Compiler (not used in this project)

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Very simple to use SNMP V1 to V3 Synchronous or Asynchronous Classes to describe requests, MIB objects, MIB OIDs etc… Browsable Javadoc with the API Can be used for agents or managers

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Warning : Bug in the 1.1 compiler

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SnmpOidTableSupport oidTable = new RFC1213_MIBOidTable(); SnmpOid.setSnmpOidTable(oidTable); SnmpPeer agent = new SnmpPeer(host, Integer.parseInt(port)); SnmpParameters params = new SnmpParameters("public", "private"); agent.setSnmpParam(params); SnmpSession session= new SnmpSession("SyncManager session"); session.setDefaultPeer(agent); SnmpVarBindList list = new SnmpVarBindList("SyncManager varbind list"); list.addVarBind("sysDescr.0"); SnmpRequest request = session.snmpGetRequest(null, list); boolean completed = request.waitForCompletion(10000); SnmpVarBindList result = request.getResponseVarBindList(); System.out.println(result); session.destroySession();

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SnmpOidTableSupport oidTable = new RFC1213_MIBOidTable();

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SnmpOid.setSnmpOidTable(oidTable) ;

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The table class can be automatically generated Necessary to use this format

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SnmpPeer agent = new SnmpPeer(host, Integer.parseInt(port)); SnmpParameters params = new SnmpParameters("public", "private"); agent.setSnmpParam(params);

High level interface As if it were local

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SnmpSession session= new SnmpSession("SyncManager session");

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session.setDefaultPeer(agent);

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The session manages the requests and the reply

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SnmpVarBindList list = new SnmpVarBindList("SyncManager varbind list"); list.addVarBind("sysDescr.0");

Allows to generate requests on multiple OIDs Generally used with only one element

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SnmpRequest request = session.snmpGetRequest(null, list);

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boolean completed = request.waitForCompletion(10000);

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Actual request. Can only be created from an existing session.

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SnmpVarBindList result = request.getResponseVarBindList (); System.out.println(result); session.destroySession();

The results are added to the request object

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Can load different RFC files 

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Can walk a branch of the tree Cache of previously fetched values 

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Need to be converted in MOSY by SmicNG

Table indexes reset is manual

Get, GetNext and Set Set was not tested Written in Java (architecture independent)

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Table indexes: when to update ? String and physical addresses Problem of display on some OS or for remote connection.

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Parse RFC directly (get rid off SmicNG) Support for trap messages Support for SNMP V3 Easier to implement than expected Versatility of JDMK

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What tools can be used to make SNMP requests in Java ? How would you differentiate real strings from physical addresses if you had to implement a MIB Browser ?