NXSL: Casting problems

[tivanni]

Hi,

i'am trying to realize a filtering script that when an interface goes down get an snmp value from the switch, using the IfIndex of the interface.

Here is my filtering script:

sub main() {
 
  transport = CreateSNMPTransport($node);    // Create SNMP transport for node
    
    ifIndex= %5;
     
    value = SNMPGetValue(transport, ".1.3.6.1.4.1.9.2.2.1.1.28.".ifIndex);
 
 
 
  CUSTOM_MESSAGE = "Description: ".value;
 
 
 
  return true;
}

The IfIndex of the interface is rapresented by the %5 special variable, because the filtering script is relative to "SYS_IF_DOWN" event which has as parameter:

"
  1) Interface object ID
  2) Interface name
  3) Interface IP address
  4) Interface netmask
  5) Interface index
"

But when the script is executed i get the following error code:

 Error in line 5: syntax error, unexpected T_INT32, expecting '('.

I have tryed to cast the value -> ifIndex = string(%5);

or

I have tryed to use a switch case to convert the value:

switch(%5):
  case "10134": etc

but nothing works

Can you help me?

Tnx

[victor]

Hi!

It should be $5. It's a bit confusing, but macros in message texts, etc. and NXSL scripts uses a bit different syntax. In macro expansion, % denotes a macro. In NXSL, parameters comes as $1, $2, etc., and % sign is a division remainder operation.

Best regards,
Victor

[tivanni]

Yes, it works!

Here is a working filtering script that get the interface description from the switch and put it in the alarm mail when interface goes down/up:

sub main() {
 
  transport = CreateSNMPTransport($node);    // Create SNMP transport for node
    
    ifIndex = $5 ;
    trace(0,"ifIndex =".ifIndex);
    
    value = SNMPGetValue(transport, ".1.3.6.1.4.1.9.2.2.1.1.28.".ifIndex);
 
 
 
  CUSTOM_MESSAGE = "Description: ".value;
 
 
 
  return true;
}

Works on Cisco. For other switch, just change the base OID in SNMPGetValue.

Is it possible to create a topic in forum in which share our NXSL script?
Sharing and example are so useful for nxsl devoloper ^^

Thank you

[victor]

Hi!

There is an area in wiki for NXSL script examples: http://wiki.netxms.org/wiki/SG:Script_Examples. Feel free to add your own!

Best regards,
Victor