how to get table data inside request handler

Hello, all!

Can you please let me know a way getting table data to manipulate it?

below code:

1. init_tables - init tables within main function.

2. Watcher - a callback, it is called when some request is received. Inside
of this callback I would like to change the table content before I need to
get a pointer to the table.

inside Watcher() netsnmp_extract_table_data_set() function get NULL instead
returing data.

#include<string.h>
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>

const int ROWID = 2;


static int Watcher(
  netsnmp_mib_handler * handler
  ,netsnmp_handler_registration * reginfo
  ,netsnmp_agent_request_info * reqinfo
  ,netsnmp_request_info * requests
  )
{

  if(MODE_IS_GET(reqinfo->mode))
  {
  netsnmp_request_info *request;
  int i = 0;

  for(request=requests;request;request = request->next)
  {
  netsnmp_table_data_set*table_set =
netsnmp_extract_table_data_set(requests);

  if(table_set)
  {
  fprintf(stderr,"NOT NULL\n");

  }
  else
  {
  fprintf(stderr,"NULL\n");
  }
  }

  return SNMP_ERR_NOERROR;
  }
  else if(MODE_IS_SET(reqinfo->mode))
  {
  puts("SET request is is not allowed");
  return SNMP_ERR_NOTWRITABLE;
  }
  return SNMP_ERR_GENERR;
}


void init_tables()
{
  netsnmp_table_data_set *table_set;
  oid some_oid[] = {1,3,6,1,4,1,23668,1025,2,8,1};
  const char * table_name = "mytable";

  const size_t size_some_oid = OID_LENGTH(some_oid);
  int count = 999;
  const char* pcount = (const char*)(&count);

  table_set = netsnmp_create_table_data_set(table_name);

  table_set->allow_creation = 0;

  netsnmp_table_dataset_add_index(table_set, ASN_OCTET_STR);

  netsnmp_table_set_multi_add_default_row(table_set,
  /*
  * column 2 = asn type,
  * writable = 0,
  * default value = NULL,
  * default value len = 0
  */
  ROWID,ASN_COUNTER,0,NULL,0,
  NULL /* done */ );

  netsnmp_register_table_data_set(netsnmp_create_handler_registration
  (table_name, Watcher,
  some_oid,
  size_some_oid,
  HANDLER_CAN_RONLY|HANDLER_CAN_NOT_CREATE), table_set, NULL);

  netsnmp_table_row *row = netsnmp_create_table_data_row();
  netsnmp_table_row_add_index(row, ASN_OCTET_STR, "some data string",
  strlen("some data string"));
  netsnmp_set_row_column(row, ROWID, ASN_COUNTER,
  pcount, sizeof(int));
  netsnmp_mark_row_column_writable(row, ROWID, 0);
  netsnmp_table_dataset_add_row(table_set, row);
}



-- 
/BR, Alexander

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