________________________________
From: Wes Hardaker <[email protected]>
To: sujata patra <[email protected]>
Cc: Wes Hardaker <[email protected]>;
[email protected]
Sent: Wed, December 22, 2010 10:05:34 AM
Subject: Re: doubt in nested table implementation
>>>>> On Tue, 21 Dec 2010 20:15:12 -0800 (PST), sujata patra
>>>>><[email protected]> said:
sp> Thanks Wes. That's right . I have got it now and able to progress . I was
sp> confused whether to make tree structure .
Tree structures are not supported by SMIv2 (the MIB language). If
you're getting the point of needing to do that it's probably time to
pick up a book on good mib design ("Understanding SNMP MIBs" is a good one).
sp> This is basically making the tree to linear array by storing the
sp> indexes of each parent/grand parent node. right ?
If you're familiar with relational databases, MIBs follow similar
concepts. The topic is much longer than I can explain quickly over
mail, so I suggest you either read a good book or read the RFC itself
(RFC2578).
sp> I have added all the columns.
sp> netsnmp_table_helper_add_indexes(table_info,
The only columns you should add are the indexes. The rest of them
shouldn't be there.
But how to tell about the columns? I do update the values of
table_info->min_column =;
table_info->max_column = ;
stack trace of crash point. This is for a single table.
#0 snmp_set_var_value (vars=0x0, value=0xbfdcea12, len=10) at snmp_client.c:765
#1 0x08048f43 in messageTable_get_next_data_point (my_loop_context=0xbfdcecd8,
my_data_context=0xbfdcecd4, put_index_data=0x91c17a8,
mydata=0x9161718) at abcModule.c:158
#2 0x0015f572 in netsnmp_table_iterator_helper_handler (handler=0x9161748,
reginfo=0x9161438, reqinfo=0x91a9d48, requests=0x91aa728)
at helpers/table_iterator.c:587
#3 0x001206c2 in netsnmp_call_handler (next_handler=0x9161748,
reginfo=0x9161438, reqinfo=0x91a9d48, requests=0x91aa728)
at agent_handler.c:522
netsnmp_table_helper_add_indexes(table_info, ASN_INTEGER,
/* ASN_OCTET_STR,
ASN_INTEGER,
ASN_INTEGER,
ASN_INTEGER,*/ 0);
It works fine if I uncomment the commented part from the above . any missing
piece? attaching the file for your reference
--
Wes Hardaker
Please mail all replies to [email protected]
/*
* Note: this file originally auto-generated by mib2c using
* : mib2c.iterate.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 "abcModule.h"
//#define SA_REPEAT 5
#define STRMAX 256
static void update_stats( unsigned int, void* );
/** Initializes the abcModule module */
void
init_abcModule(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[] = {1,3,6,1,4,1,11456,3,3};
const size_t messageTable_oid_len = OID_LENGTH(messageTable_oid);
netsnmp_handler_registration *reg;
netsnmp_iterator_info *iinfo;
netsnmp_table_registration_info *table_info;
DEBUGMSGTL(("abcModule:init", "initializing table messageTable\n"));
reg = netsnmp_create_handler_registration(
"messageTable", messageTable_handler,
messageTable_oid, messageTable_oid_len,
HANDLER_CAN_RWRITE
);
table_info = SNMP_MALLOC_TYPEDEF( netsnmp_table_registration_info );
netsnmp_table_helper_add_indexes(table_info, ASN_INTEGER,
/* ASN_OCTET_STR,
ASN_INTEGER,
ASN_INTEGER,
ASN_INTEGER,*/ 0);
table_info->min_column = COLUMN_MESSAGETYPE;
table_info->max_column = COLUMN_CURRENTMSGID;
iinfo = SNMP_MALLOC_TYPEDEF( netsnmp_iterator_info );
iinfo->get_first_data_point = messageTable_get_first_data_point;
iinfo->get_next_data_point = messageTable_get_next_data_point;
iinfo->table_reginfo = table_info;
netsnmp_register_table_iterator( reg, iinfo );
snmp_alarm_register( 5, SA_REPEAT , update_stats, NULL );
/* 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;
/* Illustrate using a simple linked list */
int valid;
struct messageTable_entry *next;
};
struct messageTable_entry *messageTable_head;
/* create a new row in the (unsorted) table */
struct messageTable_entry *
messageTable_createEntry(
long messageIndex
) {
struct messageTable_entry *entry;
entry = SNMP_MALLOC_TYPEDEF(struct messageTable_entry);
if (!entry)
return NULL;
entry->messageIndex = messageIndex;
entry->next = messageTable_head;
messageTable_head = entry;
return entry;
}
/* remove a row from the table */
void
messageTable_removeEntry( struct messageTable_entry *entry ) {
struct messageTable_entry *ptr, *prev;
if (!entry)
return; /* Nothing to remove */
for ( ptr = messageTable_head, prev = NULL;
ptr != NULL;
prev = ptr, ptr = ptr->next ) {
if ( ptr == entry )
break;
}
if ( !ptr )
return; /* Can't find it */
if ( prev == NULL )
messageTable_head = ptr->next;
else
prev->next = ptr->next;
SNMP_FREE( entry ); /* XXX - release any other internal resources */
}
/* Example iterator hook routines - using 'get_next' to do most of the work */
netsnmp_variable_list *
messageTable_get_first_data_point(void **my_loop_context,
void **my_data_context,
netsnmp_variable_list *put_index_data,
netsnmp_iterator_info *mydata)
{
*my_loop_context = messageTable_head;
return messageTable_get_next_data_point(my_loop_context, my_data_context,
put_index_data, mydata );
}
netsnmp_variable_list *
messageTable_get_next_data_point(void **my_loop_context,
void **my_data_context,
netsnmp_variable_list *put_index_data,
netsnmp_iterator_info *mydata)
{
struct messageTable_entry *entry = (struct messageTable_entry
*)*my_loop_context;
netsnmp_variable_list *idx = put_index_data;
int msg_id, msg_sent, msg_err = 0;
char type[10];
if ( entry ) {
snmp_set_var_typed_integer( idx, ASN_INTEGER, entry->messageIndex );
idx = idx->next_variable;
//type = (char*) malloc(11);
//char type1 ='j';
strcpy(type, entry->messageType);
snmp_set_var_value(idx, (u_char *)&type, sizeof(type));
idx = idx->next_variable;
msg_id = entry->currentMsgID;
snmp_set_var_value(idx, (u_char *)&msg_id, sizeof(msg_id));
idx = idx->next_variable;
msg_sent = entry->sentMsgCount;
snmp_set_var_value(idx, (u_char *)&msg_sent, sizeof(msg_sent));
idx = idx->next_variable;
msg_err = entry->errorMsgCount;
snmp_set_var_value(idx, (u_char *)&msg_err, sizeof(msg_err));
*my_data_context = (void *)entry;
*my_loop_context = (void *)entry->next;
return put_index_data;
} else {
return NULL;
}
}
/** 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(("abcModule: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_extract_iterator_context(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,
sizeof(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;
/*
* Write-support
*/
case MODE_SET_RESERVE1:
break;
case MODE_SET_RESERVE2:
break;
case MODE_SET_FREE:
break;
case MODE_SET_ACTION:
break;
case MODE_SET_UNDO:
break;
case MODE_SET_COMMIT:
break;
}
return SNMP_ERR_NOERROR;
}
static void
update_stats(unsigned int reg, void * vargs ) {
FILE *fp;
struct messageTable_entry *this;
char buf[STRMAX];
char type[10];
int index = 0;
int msg_id, msg_sent, msg_err = 0;
memset(type,0x00,10);
fp = fopen( "data.txt", "r" );
if ( !fp ) {
return ;
}
while ( fgets( buf, STRMAX, 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;
this->next = messageTable_head;
messageTable_head = this; /* Iterate helper is fine with unordered
lists! */
}
fclose(fp);
return ; /* OK */
}
------------------------------------------------------------------------------
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