Re :Re: Problem with multiple get

girish Wed, 23 Jan 2008 05:12:39 -0800

Hi Dave,&nbsp;&nbsp;&nbsp; I'm able to get multiple attributes for scalars, 
however i've some problem with tablular objects. When ever&nbsp;&nbsp;&nbsp; I 
issue a snmpget for multiple attributes of tabular type the response would be 
as follows:snmpget -v 3 -u myuser -l authNoPriv -a MD5 -A mypassword -IR 
localhost MytableUserLabel.1 MytableId.1MY-MIB::MytableUserLabel.1 = Wrong Type 
(should be OCTET STRING): INTEGER: 1MY-MIB::MytableId.1 = No Such Instance 
currently exists at this OIDI found that the request which master is sending to 
the subagent is not as that of scalar objects.while debugging I found from the 
scalar objects that, 2 requests will be sent for 2 different scalar objects. 
Butthis is not the case in table objects. Its sending 2 different requests with 
a single table object(in the above case 1st object.)What could be wrong 
here??My mib2c code for MODE GET of tablular objects&nbsp; which i've slightly 
modified is as follows:case MODE_GET:&nbsp;&nbsp;&nbsp;&nbsp;&
 nbsp;&nbsp;&nbsp; for (request = requests; request; request = 
request-&gt;next) 
{&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; table_entry 
= (struct MyTable_entry 
*)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 
netsnmp_extract_iterator_context(request);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 table_info = 
netsnmp_extract_table_info(request);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 switch (table_info-&gt;colnum) 
{&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; case 
COLUMN_MYTABLEID:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 Response_handle(unsigned char *Buffer,int size, netsnmp_request_info 
*requests);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 break;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; case 
COLUMN_MYTABLEUSERLABEL:&n
 
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 Response_handle(unsigned char *Buffer,int size, netsnmp_request_info 
*requests);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 break;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
default:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 
snmp_set_var_typed_value(request-&gt;requestvb,&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 SNMP_NOSUCHOBJECT, NULL, 0);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp
 ;&nbsp;&nbsp;&nbsp;&nbsp; }&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
}&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; break;On Wed, 23 Jan 2008 09:53:40 
+0000 "Dave Shield"  wrote  On 23 Jan 2008 09:39:14 -0000, girish  wrote:  &gt; 
But what I doubt is if we send a get request with multiple attributes in  &gt; 
a single request how it will be handled by the Master.    All the varbinds will 
be processed, and the results returned in the same  order as the original 
request.    &gt;   How it will forward it to the subagent.    The varbinds that 
are relevant to a particular subagent will be forwarded  to that subagent.   
Those that are registered within the main agent will  be handled internally.    
   The master agent stiches everything together in the right order,  before 
returning the response.      &gt;     How actually this handled at master 
side???    I'm sorry - I don't have the time to explain the inner workings of  
the agent.   Please just believe me that Everything Just Work
 s.      (In fact, it relies on the 'next_variable' links of the 'requestvb'  
structure - which is why you shouldn't be following these.   Your  MIB module 
should work with the 'request-&gt;next' links, which  follow the varbinds 
relevant to your module.   Anything else is  None Of Your Business).    Dave    
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Regards,
Girish

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Re :Re: Problem with multiple get

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