On 29 May 2012 12:50, Magda Stefan <[email protected]> wrote:
> I'm using a program that will write every 1 second in 2 files de
> values that I need: eth0_delay.out and eth0_datarate.out.In those files it
> is only one row that contains a string[15] that represent the measured
> values from my interface.
This pair of files contains just one pair of values?
That means you've got a single row in the table?
Why are you using a table at all?
If you've only got one value, then surely you only need a pair
of scalar objects?
> This is what I have tried to do:
> ##################################################################################
> int
> netSnmpPrvTable_load(netsnmp_cache * cache, void *vmagic)
> {
> netsnmp_tdata *table = (netsnmp_tdata *) vmagic;
> netsnmp_tdata_row *row;
> FILE *fp;
> char buf[STRMAX];
> struct netSnmpPrvTable_entry *entry;
>
> printf("Reading file: eth0_delay.out\n");
> fp = fopen("/tmp/eth0_delay", "r");
>
> long netSnmpPrvIndex=1;
> netsnmp_tdata_row *this;
>
> printf("loading cache: %d\n" ,(int) &cache);
>
>
> // while (fgets(buf, STRMAX, fp)) {
> /*
> * Unpick 'buf' to extract the index values...
> */
> //////////////////////////////////////////////// Trying to bind static
> values/////////
> row->data = entry;
Where does 'entry' come from?
> strcpy(entry->netSnmpPrvOWD,"1234");
> entry->netSnmpPrvOWD_len=4;
> strcpy(entry->netSnmpPrvOWD,"4321");
> entry->netSnmpPrvOWD_len=4;
>
>
> entry->netSnmpPrvIndex = 1;
> netsnmp_tdata_row_add_index(row, ASN_INTEGER,
> &(entry->netSnmpPrvIndex),
> sizeof(entry->netSnmpPrvIndex));
> netsnmp_tdata_add_row(table, row);
This is where the data structure for holding the row values
is created. Here - not before.
>
> //////////////////////////////////////////////////////////////////////////////////////
> this = netSnmpPrvTable_createEntry(table, netSnmpPrvIndex);
> /*
> * ... and then populate 'this' with the column values
> */
Please note the comment above.
And *THEN* (not before) populate 'this' (not 'entry') with the column values.
> when I start the subagent it looks like:
>
> cache created: -1078654040
> table refistered: -1078654036
> NET-SNMP version 5.5 AgentX subagent connected
> netSnmpPrvTable_subagent is up and running.
>
> And then for the request: snmpget -v2c -c public localhost
> .1.3.6.1.4.1.8072.9999.9999.1.2.1.2.1
> the subagent displays: handling request: 160 and I get the response:
> NET-SNMP-MIB2::netSnmpPrvOWD.1 = No Such Instance currently exists at this OID
I'd have expected the subagent to crash, since you're dereferencing
a variable (entry) that you haven't initialised.
Dave
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