Dear all,
I am new in this list, I am learning make a simple MIB for host that connect to
my host.
All IP address is listed in file /etc/HostIndex with format "index Ip_address".
This is the example of /etc/HostIndex :
# cat /etc/HostIndex
0 192.168.1.3
1 192.168.2.2
that file updated sometimes, so I dont need realtime update of that value on
get request.
I am trying build new MIB, with consist one table. it named MY-MIB.txt :
MY-PRIV-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, Integer32, Unsigned32,
Gauge32, Counter32, Counter64, IpAddress, mib-2
FROM SNMPv2-SMI
MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF
ucdExperimental FROM UCD-SNMP-MIB
InetAddress, InetAddressType,
InetPortNumber FROM INET-ADDRESS-MIB;
myPrivMIB MODULE-IDENTITY
LAST-UPDATED "200803310000Z"
ORGANIZATION "Mine"
CONTACT-INFO "Bandung
[EMAIL PROTECTED]
"
DESCRIPTION "Private MIB for listing any host who ever connect to this host
"
::= { ucdExperimental 18 }
myPriv OBJECT IDENTIFIER ::= { myPrivMIB 1 }
myHostTable OBJECT-TYPE
SYNTAX SEQUENCE OF WiltHostEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This is an object that simply supports a writable integer
when compiled into the agent. See
implementation details."
::= { myPriv 1 }
myHostEntry OBJECT-TYPE
SYNTAX myHostEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This is an object that simply supports a writable integer
when compiled into the agent. See
implementation details."
INDEX { myHostId }
::= { myHostTable 1 }
myHostEntry ::= SEQUENCE {
myHostId Integer32,
myHostAddress InetAddress}
myHostId OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Define as host Index, from file HostIndex"
::= { myHostEntry 1 }
myHostAddress OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"IP Address of host listed in HostIndex"
::= { myHostEntry 2 }
END
after that, I make that mib to c code using mib2c command :
# env MIBS="All" mib2c -c mib2c.iterate.conf myPrivMIB
that command will generate myPrivMIB.c and myPrivMIB.h
I edit myPrivMIB.c, I added procedure DataToLinkedList() so it will load data
from file /etc/HostIndex automatically every this agent start :
/*
* Note: this file originally auto-generated by mib2c using
* : mib2c.iterate.conf,v 5.19 2006/09/07 16:17:35 dts12 Exp $
*/
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include "myPrivMIB.h"
#define INDEX_FILE "/etc/HostIndex"
void DataToLinkedList();
/** Initializes the myPrivMIB module */
void
init_myPrivMIB(void)
{
/*
* here we initialize all the tables we're planning on supporting
*/
DataToLinkedList();
initialize_table_myHostTable();
}
//# Determine the first/last column names
/** Initialize the myHostTable table by defining its contents and how it's
structured */
void
initialize_table_myHostTable(void)
{
static oid myHostTable_oid[] =
{ 1, 3, 6, 1, 4, 1, 2021, 13, 18, 1, 1 };
size_t myHostTable_oid_len = OID_LENGTH(myHostTable_oid);
netsnmp_handler_registration *reg;
netsnmp_iterator_info *iinfo;
netsnmp_table_registration_info *table_info;
reg =
netsnmp_create_handler_registration("myHostTable",
myHostTable_handler,
myHostTable_oid,
myHostTable_oid_len,
HANDLER_CAN_RONLY);
table_info = SNMP_MALLOC_TYPEDEF(netsnmp_table_registration_info);
netsnmp_table_helper_add_indexes(table_info, ASN_INTEGER, /* index:
myHostId */
0);
table_info->min_column = COLUMN_MYHOSTID;
table_info->max_column = COLUMN_MYHOSTADDRESS;
iinfo = SNMP_MALLOC_TYPEDEF(netsnmp_iterator_info);
iinfo->get_first_data_point = myHostTable_get_first_data_point;
iinfo->get_next_data_point = myHostTable_get_next_data_point;
iinfo->table_reginfo = table_info;
netsnmp_register_table_iterator(reg, iinfo);
/*
* Initialise the contents of the table here
*/
}
/*
* Typical data structure for a row entry
*/
struct myHostTable_entry {
/*
* Index values
*/
// long myHostId;
/*
* Column values
*/
long myHostId;
char myHostAddress[1024];
size_t myHostAddress_len;
/*
* Illustrate using a simple linked list
*/
int valid;
struct myHostTable_entry *next;
};
struct myHostTable_entry *myHostTable_head;
/*
* create a new row in the (unsorted) table
*/
struct myHostTable_entry *
myHostTable_createEntry(long myHostId)
{
struct myHostTable_entry *entry;
entry = SNMP_MALLOC_TYPEDEF(struct myHostTable_entry);
if (!entry)
return NULL;
entry->myHostId = myHostId;
entry->next = myHostTable_head;
myHostTable_head = entry;
return entry;
}
/*
* remove a row from the table
*/
void
myHostTable_removeEntry(struct myHostTable_entry *entry)
{
struct myHostTable_entry *ptr, *prev;
if (!entry)
return; /* Nothing to remove */
for (ptr = myHostTable_head, prev = NULL;
ptr != NULL; prev = ptr, ptr = ptr->next) {
if (ptr == entry)
break;
}
if (!ptr)
return; /* Can't find it */
if (prev == NULL)
myHostTable_head = ptr->next;
else
prev->next = ptr->next;
SNMP_FREE(entry); /* XXX - release any other internal resources */
}
void DataToLinkedList() {
char hostidx[32], ipaddr[64];
char cbuff[255];
bzero(cbuff, sizeof(cbuff));
FILE *fidx;
fidx = fopen(INDEX_FILE, "r");
while (fgets(cbuff, sizeof(cbuff), fidx) != NULL) {
sscanf(cbuff, "%s %s", hostidx, ipaddr);
struct myHostTable_entry *row = malloc(sizeof(struct
myHostTable_entry));
row->myHostId = atoi(hostidx);
strcpy(row->myHostAddress, ipaddr);
row->myHostAddress_len = strlen(ipaddr);
if (myHostTable_head == NULL) {
myHostTable_head = row;
} else {
row->next = myHostTable_head;
myHostTable_head = row;
}
}
fclose(fidx);
}
/*
* Example iterator hook routines - using 'get_next' to do most of the work
*/
netsnmp_variable_list *
myHostTable_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 = myHostTable_head;
return myHostTable_get_next_data_point(my_loop_context,
my_data_context, put_index_data,
mydata);
}
netsnmp_variable_list *
myHostTable_get_next_data_point(void **my_loop_context,
void **my_data_context,
netsnmp_variable_list * put_index_data,
netsnmp_iterator_info *mydata)
{
struct myHostTable_entry *entry =
(struct myHostTable_entry *) *my_loop_context;
netsnmp_variable_list *idx = put_index_data;
if (entry) {
snmp_set_var_typed_integer(idx, ASN_INTEGER, entry->myHostId);
idx = idx->next_variable;
*my_data_context = (void *) entry;
*my_loop_context = (void *) entry->next;
return put_index_data;
} else {
return NULL;
}
}
/** handles requests for the myHostTable table */
int
myHostTable_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 myHostTable_entry *table_entry;
switch (reqinfo->mode) {
/*
* Read-support (also covers GetNext requests)
*/
case MODE_GET:
for (request = requests; request; request = request->next) {
table_entry = (struct myHostTable_entry *)
netsnmp_extract_iterator_context(request);
table_info = netsnmp_extract_table_info(request);
switch (table_info->colnum) {
case COLUMN_MYHOSTID:
snmp_set_var_typed_integer(request->requestvb, ASN_INTEGER,
table_entry->myHostId);
break;
case COLUMN_MYHOSTADDRESS:
snmp_set_var_typed_value(request->requestvb, ASN_OCTET_STR,
(u_char *) table_entry->
myHostAddress,
table_entry->myHostAddress_len);
break;
default:
/*
* An unsupported/unreadable column (if applicable)
*/
snmp_set_var_typed_value(request->requestvb,
SNMP_NOSUCHOBJECT, NULL, 0);
}
}
break;
}
return SNMP_ERR_NOERROR;
}
Then, I compile that code to agent with this command :
# net-snmp-config --compile-subagent mysubagent myPrivMIB.c
Next, I am trying that code :
# ./mysubagent -Le -f
NET-SNMP version 5.4 AgentX subagent connected
trying snmpwalk to that oid :
# snmpwalk -c public localhost .1.3.6.1.4.1.2021.13.18
UCD-SNMP-MIB::ucdExperimental.18.1.1.1.1.0 = INTEGER: 0
UCD-SNMP-MIB::ucdExperimental.18.1.1.1.1.1 = INTEGER: 1
UCD-SNMP-MIB::ucdExperimental.18.1.1.1.2.0 = STRING: "192.168.1.3"
UCD-SNMP-MIB::ucdExperimental.18.1.1.1.2.1 = STRING: "192.168.2.2"
Error in packet.
Reason: (genError) A general failure occured
Failed object: UCD-SNMP-MIB::ucdExperimental.18.1.1.1.2.1
#
and mysubagent exit with error :
# ./mysubagent -Le -f
NET-SNMP version 5.4 AgentX subagent connected
Segmentation fault
Please help me, is there something I passed?
Thanks for your helps.
Regards,
Denny
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