Hi,
I am trying to write an sample using table_tdata. using cache , I am unable
to load xxx_load() function. So I am not able to get any data using snmpcmd.
I did not do much other than implementing the _load and _free() hooks.
What's the wrong I am doing ?
I do not have anything to initialize in initialize_table_xxx()
attaching the file here.
Thanks
/*
* Note: this file originally auto-generated by mib2c using
* : mib2c.table_data.conf 19302 2010-08-13 12:19:42Z dts12 $
*/
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include "abctable_cache.h"
/** Initializes the abctable_cache module */
void
init_abc(void)
{
/* here we initialize all the tables we're planning on supporting */
initialize_table_messageTable();
}
/** Initialize the messageTable table by defining its contents and how it's
structured */
void
initialize_table_messageTable(void)
{
const oid messageTable_oid[] = {1,3,6,1,4,1,11457,3,3};
const size_t messageTable_oid_len = OID_LENGTH(messageTable_oid);
netsnmp_handler_registration *reg;
netsnmp_tdata *table_data;
netsnmp_table_registration_info *table_info;
netsnmp_cache *cache;
snmp_log(LOG_INFO,"initializing .\n\n");
reg = netsnmp_create_handler_registration(
"messageTable", messageTable_handler,
messageTable_oid, messageTable_oid_len,
HANDLER_CAN_RWRITE
);
table_data = netsnmp_tdata_create_table( "messageTable", 0 );
if (NULL == table_data) {
snmp_log(LOG_ERR,"error creating tdata table for messageTable\n");
return;
}
snmp_log(LOG_INFO,"_tdata_create .\n\n");
cache = netsnmp_cache_create(MESSAGETABLE_TIMEOUT,
messageTable_load, messageTable_free,
messageTable_oid, messageTable_oid_len);
if (NULL == cache) {
snmp_log(LOG_ERR,"error creating cache for messageTable\n");
}
else
cache->magic = (void *)table_data;
table_info = SNMP_MALLOC_TYPEDEF( netsnmp_table_registration_info );
if (NULL == table_info) {
snmp_log(LOG_ERR,"error creating table info for messageTable\n");
return;
}
netsnmp_table_helper_add_indexes(table_info,
ASN_INTEGER, /* index: messageIndex */
0);
table_info->min_column = COLUMN_MESSAGETYPE;
table_info->max_column = COLUMN_CURRENTMSGID;
netsnmp_tdata_register( reg, table_data, table_info );
snmp_log(LOG_INFO,"netsnmp_tdata_register .\n\n");
if (cache)
netsnmp_inject_handler_before( reg, netsnmp_cache_handler_get(cache),
TABLE_TDATA_NAME);
/* Initialise the contents of the table here */
}
/* Typical data structure for a row entry */
struct messageTable_entry {
/* Index values */
long messageIndex;
/* Column values */
char messageType[10];
long sentMsgCount;
long errorMsgCount;
long currentMsgID;
};
/* Example cache handling - set up table_data list from a suitable file */
int
messageTable_load( netsnmp_cache *cache, void *vmagic ) {
netsnmp_tdata *table = (netsnmp_tdata *)vmagic;
netsnmp_tdata_row *row;
struct messageTable_entry *this;
FILE *fp;
char buf[256];
char type[10];
int index = 0;
int msg_id, msg_sent, msg_err = 0;
memset(type,0x00,10);
fp = fopen( "data.txt", "r" );
snmp_log(LOG_INFO,"loading the data.\n\n");
if ( !fp ) {
return -1;
}
while ( fgets( buf, 256, fp )) {
this = SNMP_MALLOC_TYPEDEF( struct messageTable_entry );
/* Unpick 'buf' and populate 'this' */
this->messageIndex = index++;
sprintf(type, "%s", strtok(buf, ","));
strcpy(this->messageType, type);
msg_id = atoi(strtok(NULL, ","));
this->currentMsgID = msg_id;
msg_sent = atoi(strtok(NULL, ","));
this->sentMsgCount = msg_sent;
msg_err = atoi(strtok(NULL, ","));
this->errorMsgCount = msg_err;
// insert this in to row->data
row = netsnmp_tdata_create_row();
row->data = this;
netsnmp_tdata_row_add_index( row, ASN_INTEGER,
&(this->messageIndex),
sizeof(this->messageIndex));
if (table)
netsnmp_tdata_add_row( table, row );
}
fclose(fp);
return 0; /* OK */
}
void
messageTable_free( netsnmp_cache *cache, void *vmagic ) {
netsnmp_tdata *table = (netsnmp_tdata *)vmagic;
netsnmp_tdata_row *this;
struct messageTable_entry *entry;
while ((this = netsnmp_tdata_row_first(table))) {
entry = (struct messageTable_entry *)this->data;
SNMP_FREE( entry );
netsnmp_tdata_remove_and_delete_row(table, this);
}
}
/** handles requests for the messageTable table */
int
messageTable_handler(
netsnmp_mib_handler *handler,
netsnmp_handler_registration *reginfo,
netsnmp_agent_request_info *reqinfo,
netsnmp_request_info *requests) {
netsnmp_request_info *request;
netsnmp_table_request_info *table_info;
struct messageTable_entry *table_entry;
DEBUGMSGTL(("abctable_cache:handler", "Processing request (%d)\n",
reqinfo->mode));
switch (reqinfo->mode) {
/*
* Read-support (also covers GetNext requests)
*/
case MODE_GET:
for (request=requests; request; request=request->next) {
table_entry = (struct messageTable_entry *)
netsnmp_tdata_extract_entry(request);
table_info = netsnmp_extract_table_info( request);
switch (table_info->colnum) {
case COLUMN_MESSAGETYPE:
if ( !table_entry ) {
netsnmp_set_request_error(reqinfo, request,
SNMP_NOSUCHINSTANCE);
continue;
}
snmp_set_var_typed_value( request->requestvb, ASN_OCTET_STR,
table_entry->messageType,
strlen(table_entry->messageType));
break;
case COLUMN_SENTMSGCOUNT:
if ( !table_entry ) {
netsnmp_set_request_error(reqinfo, request,
SNMP_NOSUCHINSTANCE);
continue;
}
snmp_set_var_typed_integer( request->requestvb, ASN_INTEGER,
table_entry->sentMsgCount);
break;
case COLUMN_ERRORMSGCOUNT:
if ( !table_entry ) {
netsnmp_set_request_error(reqinfo, request,
SNMP_NOSUCHINSTANCE);
continue;
}
snmp_set_var_typed_integer( request->requestvb, ASN_INTEGER,
table_entry->errorMsgCount);
break;
case COLUMN_CURRENTMSGID:
if ( !table_entry ) {
netsnmp_set_request_error(reqinfo, request,
SNMP_NOSUCHINSTANCE);
continue;
}
snmp_set_var_typed_integer( request->requestvb, ASN_INTEGER,
table_entry->currentMsgID);
break;
default:
netsnmp_set_request_error(reqinfo, request,
SNMP_NOSUCHOBJECT);
break;
}
}
break;
}
return SNMP_ERR_NOERROR;
}
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