sharpsnmplib Forum Rss Feed

New Post: MIB Parsing

lextm — Sun, 22 Nov 2009 09:19:16 GMT

Hi Ben,

It should be possible if we enhance the existing compiler, but now I rather spare time on the new ANTLR based compiler. It is still far to go there.

If you like, you can check out the latest source code and place with our AST project.

Regards,

New Post: MIB Parsing

gazer — Sun, 22 Nov 2009 06:40:17 GMT

Hi there,

This project is fantastic! The code is professional and the included MIB browser showcases it magnificently. Well done!

Given the full path to a MIB and an OID defined therein, I’m trying to extract the name and SNMP type (SYNTAX ) of the object. Is this possible? Though new to the project, I’ve tried for several hours. Any code snippets would be greatly appreciated!

Thank you,

Ben

New Post: why the field "index" doesn't be initialized in lexer.cs

lextm — Wed, 04 Nov 2009 05:26:37 GMT

Hi,

Please let me know if you have a specific error to report. Thanks.

We will not try to improve the existing parser as we have a new implementation in the kitchen. Hope I can post our progress on it in the next few weeks.

Regards,

Lex

New Post: why the field "index" doesn't be initialized in lexer.cs

nalandra — Tue, 03 Nov 2009 07:55:21 GMT

I think "index" is used to point to the "Symbol" in "_symbols". I don't see a constructor function in lexer.cs , and field "index" be initialized. So when using "new lexer();" and "lexer.NextSymbol", is there a probability of causing error?

New Post: VACM and #SNMP

lextm — Tue, 27 Oct 2009 01:39:32 GMT

VACM is a core component for SNMP v3 agents. It mainly enhances security and monitors object access.

As #SNMP at this moment still focuses on SNMP managers and messaging side, we don't implement anything related to VACM yet. TestAgent project is a nice place to try out some VACM rules, but we don't have a plan on that for 4.0 release.

New Post: VACM and #SNMP

jbarkai — Mon, 26 Oct 2009 08:43:30 GMT

Hello,

First, I would like to mark out that this project is magnificent! Very professional and comprehensive.

Now, I'm currently researching the View Access Control Model (VACM) in SNMP.
Reading its long and tiresome RFC (2575) I recognized that the VACM logic should actually be implemented almost completely inside the application code itself, and beside the additional SNMPv3 messge parameters, the VACM is just outlines the characteristics of a view-based security mechanism. I also noticed that some "MIB View" file should be created in order to fullfill the management of a group-authorization idea.

I have the theory in mind, it's just I fail to connect all these details to a working code... :(
So Is there any code that can show how to manipulate VACM using #SNMP project?

Any hint will be blessed,

Jack

New Post: Things that would make this library easier to use from PowerShell

lextm — Tue, 20 Oct 2009 07:11:55 GMT

Thanks for sharing your thoughts.

My answer is that this library is not really designed for PowerShell, so we cannot expect such support in the first place.

What about wrapping over the command line utilities we provided? Like snmpget, snmpset, and so on. If you need more command line tool, we can see if it is easy to bring them on our TODO list and raise their priority.

Regards,

Lex

New Post: Things that would make this library easier to use from PowerShell

halr9000 — Mon, 19 Oct 2009 15:58:18 GMT

This is just a laundry list of things that I'd like to see. I'm going through an exercise now to try and send a trap from PowerShell and I'm having a hard time because 1) I'm not a dev and 2) It's non-trivial to create generics from PowerShell. I've invested a lot of time to get where I am so far, and I think I may end up in the right place before too much longer, but, if I had my way...

Classes would have constructors with zero arguments. Sometimes in PowerShell, it's a lot easier to create a .NET object and then fill out its properties after object creation. I've seen several .NET libs which allow this.
Properties would be read/write. e.g. I want to do #1 above, and then something like: $myObj.Property = "foo"
Types should be more liberal. For example, if every parameter or property that accepts a Lextm.Sharpsnmplib.OctetString also accepted System.String, my life would be SO much easier.
Same goes for OIDs. If I can type [lextm.sharpsnmplib.objectidentifier]"1.3.6" and have it work, then I don't understand (from my sysadmin POV), why you can't just take strings everywhere that a string can be coerced into place anyway.
Same for IPEndpoint. I'd much rather there be overloads and properties that would take a [string] or [ipaddress] ip address and an [int] port.
Generics are hard to work with in PowerShell, but [system.array] and [system.collections.hashtable] are not. For example, I'd like to be able to create a "simple array" of Lextm.Sharpsnmplib.Variable, instead of having to create an IList.

I'm sure there's other examples, but I think you see where I'm going. I know that you have all this strict type checking for a reason, but PowerShell enables a much looser style and that works well for a whole different audience--an audience I think you'd do well to encourage.

Eventually, I may publish a proper powershell module that would hide all of the complexity anyway, but until I get to that point...this stuff is a lot of work!

New Post: Cannot use the NUnit unit tests of the Project

mdelcarpio — Fri, 16 Oct 2009 14:17:16 GMT

Hi all,

Thank you guys for your help. I have solved my issue installing TestDriven.Net in order to run NUnit in the VS IDE.

Now I can run the unit tests.

Thank you again!

Mauricio

New Post: Cannot use the NUnit unit tests of the Project

lextm — Fri, 16 Oct 2009 10:02:22 GMT

Hi,

Also note that some test cases require an SNMP agent to be available locally. It is bad dependency, but I could not find a way to replace them. :)

Good luck.

Lex

New Post: Cannot use the NUnit unit tests of the Project

andreabertolotto — Fri, 16 Oct 2009 09:44:20 GMT

Hi,

no problems here with unit testing with nUnit.

Have you installed latest version of nUnit?

Does your source code compiles correctly?

Exception seems related to nUnit not able to load compiled assembly containing unit tests.

Hope this helps,

Andrea

New Post: Cannot use the NUnit unit tests of the Project

mdelcarpio — Thu, 15 Oct 2009 23:51:23 GMT

I compiled the SharpSnmpLib project with VS2008 successfully. I was trying to open the NUnit project in order to run the unit tests of the project but I cannot open it. It shows me an exception message:

System.IO.FileNotFoundException: Could not load file or assembly 'SharpSnmp:ib.Tests' or one of its dependencies. The system cannot find the file specified. 

For further information, use the Exception Details menu item.

The exception details are:

System.IO.FileNotFoundException...

Server stack trace:

at System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)

at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)

at System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)

at System.Reflection.Assembly.Load(String assemblyString)

at NUnit.Core.Builders.TestAssemblyBuilder.Load(String path)

at NUnit.Core.Builders.TestAssemblyBuilder.Build(String assemblyName, Boolean autoSuites)

at NUnit.Core.Builders.TestAssemblyBuilder.Build(String assemblyName, String testName, Boolean autoSuites)

at NUnit.Core.TestSuiteBuilder.BuildSingleAssembly(TestPackage package)

at NUnit.Core.TestSuiteBuilder.Build(TestPackage package)

at NUnit.Core.SimpleTestRunner.Load(TestPackage package)

at NUnit.Core.ProxyTestRunner.Load(TestPackage package)

at NUnit.Core.RemoteTestRunner.Load(TestPackage package)

at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs)

at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg, Int32 methodPtr, Boolean fExecuteInContext)

Exception rethrown at [0]:

at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)

at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)

at NUnit.Core.TestRunner.Load(TestPackage package)

at NUnit.Util.TestDomain.Load(TestPackage package)

at NUnit.Util.TestLoader.LoadTest(String testName)

System.IO.FileNotFoundException...

Server stack trace: 
   at System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)
   at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
   at System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
   at System.Reflection.Assembly.Load(String assemblyString)
   at NUnit.Core.Builders.TestAssemblyBuilder.Load(String path)
   at NUnit.Core.Builders.TestAssemblyBuilder.Build(String assemblyName, Boolean autoSuites)
   at NUnit.Core.Builders.TestAssemblyBuilder.Build(String assemblyName, String testName, Boolean autoSuites)
   at NUnit.Core.TestSuiteBuilder.BuildSingleAssembly(TestPackage package)
   at NUnit.Core.TestSuiteBuilder.Build(TestPackage package)
   at NUnit.Core.SimpleTestRunner.Load(TestPackage package)
   at NUnit.Core.ProxyTestRunner.Load(TestPackage package)
   at NUnit.Core.ProxyTestRunner.Load(TestPackage package)
   at NUnit.Core.RemoteTestRunner.Load(TestPackage package)
   at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs)
   at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg, Int32 methodPtr, Boolean fExecuteInContext)

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at NUnit.Core.TestRunner.Load(TestPackage package)
   at NUnit.Util.TestDomain.Load(TestPackage package)
   at NUnit.Util.TestLoader.LoadTest(String testName)

Has any body seen this before? Please help me on this. Thank you!

New Post: SNMP Library usage

andreabertolotto — Mon, 12 Oct 2009 06:11:34 GMT

Hi Jim,

you can see DefaultObjectRegistry.Instance has five default loaded modules having a look at its implementation, in file:

SharpSnmpLib\Mib\DefaultObjectRegistry.cs, LoadDefaultModules method.

This modules are normally required in every MIB operation because they are imported almost everywhere.

Anyway, you can easily unload this modules using:

DefaultObjectRegistry.Instance.Tree.Remove("SNMPV2-SMI");
DefaultObjectRegistry.Instance.Tree.Remove("SNMPV2-CONF");
DefaultObjectRegistry.Instance.Tree.Remove("SNMPV2-TC");
DefaultObjectRegistry.Instance.Tree.Remove("SNMPV2-MIB");
DefaultObjectRegistry.Instance.Tree.Remove("SNMPV2-TM");
DefaultObjectRegistry.Instance.Refresh();

Hope this helps,

Andrea

New Post: SNMP Library usage

jm3 — Mon, 12 Oct 2009 02:08:19 GMT

Andrea,

I'm looking at the DefaultObjectRegistry.Instance.Trre and notice it already has modules loaded. Is there a way for me to start up "clean" so I do not have these already loaded?

Jim

New Post: SNMP Library usage

jm3 — Mon, 12 Oct 2009 00:17:40 GMT

Andrea,

Thanks so much for the sample code. I will walk through it and see if it helps me get what I need. Hopefully it's just a matter of me not understanding how to properly use the library.

I'll let you know how I make out,

Jim

New Post: SNMP Library usage

andreabertolotto — Sun, 11 Oct 2009 09:37:34 GMT

Hi Jim and Lex,

don't know exactly what are you trying to achieve, anyway, I'll share my experience here.

I'm actually compiling my custom MIB at runtime, extracting relevant informations and executing Snmp queries using custom MIB data. Basically, my application (it's a device dumper), can load my MIB (with some dependencies), compile it at runtime and then loop inside Oids to query my devices. This is done because my actual MIB is subject to frequent changes.

This is relevant code:

string snmpv2TCFilename = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "SNMPv2-TC.txt");
string snmpv2SMIFilename = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "SNMPv2-SMI.txt");
string snmpv2CONFFilename = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "SNMPv2-CONF.txt");

// this is my custom MIB, that has dependencies on previous ones
string snmpv2CustomMibFilename = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "MY-CUSTOM-MIB.txt");

IList<IModule> snmpTCModule = Parser.Compile(snmpv2TCFilename);
DefaultObjectRegistry.Instance.Import(snmpTCModule);

IList<IModule> snmpSMIModule = Parser.Compile(snmpv2SMIFilename);
DefaultObjectRegistry.Instance.Import(snmpSMIModule);

IList<IModule> snmpCONFModule = Parser.Compile(snmpv2CONFFilename);
DefaultObjectRegistry.Instance.Import(snmpCONFModule);

IList<IModule> customMibModule = Parser.Compile(snmpv2CustomMibFilename);
DefaultObjectRegistry.Instance.Import(customMibModule);

DefaultObjectRegistry.Instance.Refresh();

if (customMibModule.Count > 0) {
    foreach (IEntity entity in customMibModule[0].Entities) {
        IDefinition node = DefaultObjectRegistry.Instance.Tree.Find(customMibModule[0].Name, entity.Name);
        if (node == null) {
            continue;
        }

        uint[] id = node.GetNumericalForm();

        if (entity.GetType().FullName.Equals("Lextm.SharpSnmpLib.Mib.ObjectType", StringComparison.OrdinalIgnoreCase)) {
            if (entity.Name.EndsWith("Table")) {
                Console.WriteLine(ObjectIdentifier.Convert(id) + "," + entity.Name);
               // Get Snmp table data
            }
            else if ((!entity.Parent.EndsWith("Entry")) && (!entity.Name.EndsWith("Entry"))) {
                Console.WriteLine(ObjectIdentifier.Convert(id) + ".0" + "," + entity.Name);
               // Get Snmp scalar data
            }
        }
    }
}

Hope this helps,

Andrea

New Post: SNMP Library usage

jm3 — Sun, 11 Oct 2009 00:23:31 GMT

Do you have a timeframe for 4.0? I will work with compilerCore and review your other code again and see what I can make do. You seem responsive, so I will just ask when I get to a spot I feel I need more control over and we'll see what you suggest.

Thanks,

Jim

New Post: SNMP Library usage

lextm — Sat, 10 Oct 2009 23:43:03 GMT

Hi Jim,

The latest description on your need shows that you need to host some part of Compiler.exe inside your code. Luckily, you can check out CompileCore.cs in Compiler project, which makes use of Parser and Assembler classes to compile *.mib files. They are high level classes recommended instead of low level classes such as MibModule and that's why I set MibModule and so on internal.

In 4.0 release, we are going to ship a new compiler architecture, so the internal classes and algorithm can change a lot (or saying totally). I can only guarantee that we will keep the high level classes untouched.

Regards,

Lex

New Post: SNMP Library usage

jm3 — Sat, 10 Oct 2009 17:43:29 GMT

So what I was hoping to do is compile the mibs from within my application. I am going to use a sql server to periodically collect some of the values identified in the mibs. I am going to have to persist some data about each mib file (like which oids I need to get values for). I was hoping to be able to compile and work directly with the MibModule and perhaps even the Lexer. I really don't want my end user having to compile from one app, then get into another in order to select values to retrieve, etc.

Jim

New Post: SNMP Library usage

lextm — Sat, 10 Oct 2009 07:59:57 GMT

Hi Jim,

First, you need to use the Compiler.exe to compile the *.mib files into *.module files.

Second, you need to follow the Browser.exe's manner. The simplest way is to make use of built in classes such as ReloadableObjectRegistry. Its constructor takes a directory that contains the *.module files, and using that it automatically loads the objects. In this way you don't even need to know anything about Lexer or MibModule.

Third, you can soon move on to notice that ReloadableObjectRegistry can work fine with other parts in the library.

Let me know if you have more questions.

Regards,

Lex