Hi All
I am using net-snmp to implement the alarm notifications using SNMPv2 traps.
I intend to send the alarm generated in the system as SNMPv2 traps.
In order to send SNMPv2 traps using net-snmp, I have followed the below
mentioned steps.
Queries:
------------
1. Please refer the steps mentioned below and let me know whether I am doing
anything unnecessary/wrong here.
2. When I run this program for the first time, everything is going fine and
the SNMPv2 trap is sent properly to the trap receiver.
But it fails to send the trap afterward. That is, the trap can be sent
only once
After investigation, I found out that snmp_add (in step 9 below) is
returning NULL in the failed cases. It throws an error "*No support for any
checked transport domain*".
Can anyone let me know why this error is being thrown? I am sure that
netsnmp_transport_open_client() is failing, but not able to figure out why.
Also please suggest any solution (may be any procedure call to initialize
the transport domain? ) for this problem.
Steps followed to send the SNMPv2 trap:
------------------------------------------------------------
Function: send_alarm_using_trap()
1. // Initialize session to default values
netsnmp_session session;
snmp_sess_init(&session);
2. // Set the directory from where additional mibs have to be read
netsnmp_get_mib_directory(); /* prepare the default directories */
netsnmp_set_mib_directory("+/home/admin/mibs"); // Set the directory
where mibs are stored
3. // Set the snmp version:
session->version = SNMP_VERSION_2c;
4. // Disable all logginng:
shutdown_snmp_logging();
netsnmp_log_handler *log_h;
int priority = 7; // LOG_DEBUG
int pri_max = 0; // LOG_EMERG
log_h = netsnmp_register_loghandler(NETSNMP_LOGHANDLER_NONE, priority);
if (log_h)
{
log_h->pri_max = pri_max;
}
5. // read in MIB database and initialize the snmp library
init_snmp("snmpapp");
6. // Set the trap receiver IP address
session->peername = trap_receiver;
7. // Set the community string
session->community = some_community_string;
session->community_len = strlen(some_community_string);
8. session.callback = NULL;
session.callback_magic = NULL;
9. // Open a SNMP session
ss = snmp_add(&session,netsnmp_transport_open_client("snmptrap",
session.peername),
NULL, NULL);
10. // Create the SNMPv2 trap PDU
pdu = snmp_pdu_create(SNMP_MSG_TRAP2);
11. // Add sysUpTime.0 to the trap PDU
snmp_add_var(pdu, objid_sysuptime, sizeof(objid_sysuptime) /
sizeof(oid), 't', trap);
12. // Add alarm oid to the trap PDU and similarly add other VarBind pairs
snmp_add_var(pdu, objid_snmptrap, sizeof(objid_snmptrap) /
sizeof(oid),'o', argv[arg])
...
...
13. // Send the trap
snmp_send(ss, pdu);
9. // Close the session
snmp_close(ss);
10. // Shutdown the SNMP application
snmp_shutdown("snmpapp");
Note: send_alarm_using_trap() function is called from my application
whenever an alarm is generated.
System details:
----------------------
Intel core 2 Duo PC running Fedora core 10.
Net-SNMP version: 5.4.2.1
Packages installed in the system:
---------------------------------
net-snmp-libs-5.4.2.1-4.fc10.i386
perl-SNMP_Session-1.12-1.fc10.noarch
net-snmp-utils-5.4.2.1-4.fc10.i386
net-snmp-5.4.2.1-4.fc10.i386
net-snmp-devel-5.4.2.1-4.fc10.i386
Thanks
Goutham B G
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