Unfortunately, I also don't have that much experience with the snmp
code, and I did not use traps so far (only snmpwalk). But what I can say
about your code is that it is likely to fail because you are using the
snmp functions from an application thread.
At least snmp_send_trap will call the UDP raw API eventually (udp_sendto
or something like that), which *must not* be called from any other
thread than lwIP's tcpip_thread or you will run into problems. You
should correct that and then report if you are still having memory leaks.
Simon
Alexandre Malo wrote:
Hello,
I am having memory leak with a task sending trap.
Here is my simple task:
#define MY_SNMP_ENTERPRISE_ID 4464
#define MY_SNMP_SYSOBJID_LEN 7
#define MY_SNMP_SYSOBJID {1, 3, 6, 1, 4, 1, MY_SNMP_ENTERPRISE_ID}
void vSendTrapTask( void * pvParameters )
{
portTickType xLastWakeTime;
struct snmp_obj_id objid = {MY_SNMP_SYSOBJID_LEN, MY_SNMP_SYSOBJID};
struct snmp_varbind *vb;
static unsigned char msg[] = "[email protected]
<mailto:[email protected]>";
static unsigned char msglen= 22;
(void) pvParameters;
for ( ;; )
{
xLastWakeTime = xTaskGetTickCount();
vb = snmp_varbind_alloc(&objid,
SNMP_ASN1_OPAQUE,
msglen);
vb->value = &msg;
trap_msg.outvb.head = vb;
trap_msg.outvb.tail = vb;
trap_msg.outvb.count = 1;
snmp_send_trap(SNMP_GENTRAP_ENTERPRISESPC, &objid, 0);
trap_msg.outvb.head = NULL;
trap_msg.outvb.tail = NULL;
trap_msg.outvb.count = 0;
vb->value = NULL;
snmp_varbind_free(vb);
// Wait for the next cycle.
vTaskDelayUntil( &xLastWakeTime, 10 );
}
}
Do I use correctly snmp_varbind_alloc?
I want to notify that the thread works for a random number of sent
trap. I tried it more than once and its never the same amount of trap
that is received.
Thanks!
Alexandre Malo
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