trap callback transport

Hi there!

I am about finding a way for the net-snmp-agent(snmpd) to poll a value using
a specific polling-rate. To do this i checked out the
examples/notification.c and implemented my new file (SysSessionActive.c) the
same way as shown in the notification.c file. It compiled cleanly but if i
start the snmpd on the target-hardware following message appears:

"mteTriggerTable has been disable because the callback transport is not
available."

When the polltime expired following messages are repeately(pollrate) printed
on the terminal:

"snmpd: send_trap: Error building ASN.1 representation"

It seems that there is something missing, however i have inserted the
Callback-transport into the configure-script (--with-transports="UDP
Callback"):

=============================================
../configure \
--build=i686 \
--host=arm-elf-linux-gnu \
--target=arm-elf-linux-gnu \
[...]
--with-cflags="-I$SRCROOTDIR/common -L$SRCROOTDIR/common
-DRAS_CONFIG_DEPLOY_1 -ggdb -DNO_MM -fno-builtin -DHAVE_SETLOCALE
-march=armv4 -DNO_SHARED_LIBS=1 -O2 -static -DCONFIG_ARCH_CNXT -D__uClinux__
-Dunix -D__linux__ -Dlinux -DEMBED" \
--with-ldflags="-I$SRCROOTDIR/common -L$SRCROOTDIR/common -lcommon -ggdb
-g,-W1,-T,/usr/local/arm-elf/lib/elf2flt.d -elf2flt -static-libgcc -Bstatic
-static" \
--with-libtool=no \
--without-kmem-usage \
--disable-mib-loading \
--enable-mini-agent \
--with-transports="UDP Callback" \
--with-out-transports="UDPIPv6 TCPIPv6 TCP Unix AAL5PVC IPX" \
--with-mib-modules="mibII target notification disman/event-mib
SysTrapsNotifications" \
--with-out-mib-modules="ucd_snmp agent_mibs agentx utilities snmpv3mips" \
[...]
--disable-md5 \
--disable-des \
--disable-privacy \
--disable-applications \
=============================================

The module SysTrapsNotifications refers to the SysSessionActive.* files(.c):

=============================================
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include "SysSessionActive.h"

#define POLLCYCLE 10

static oid snmptrap_oid[] = {1, 3, 6, 1, 6, 3, 1, 1, 4, 1, 0};



void init_SysSessionActive(void)
{
DEBUGMSGTL(("test notification","initializing SysSessionActive\n"));

snmp_alarm_register (
POLLCYCLE, /* seconds */
SA_REPEAT, /* repeat every POLLCYCLE seconds */
send_SysSessionActive_notification, /* callback function */
NULL /* no callback data needed */
);
}//end init_SysSessionActive

void send_SysSessionActive_notification(unsigned int clientreg, void
*clientarg)
{
// oid of the notification that will be sent
oid SysSessionActive_oid[] = { 1,3,6,1,4,1,22638,3,2,5,10 };
size_t SysSessionActive_oid_len = OID_LENGTH(SysSessionActive_oid);

oid objid_snmptrap[] = { 1, 3, 6, 1, 6, 3, 1, 1, 4, 1, 0 };
size_t objid_snmptrap_len = OID_LENGTH(objid_snmptrap);

/**/ int rate = 100;

// oid's that will be included in the notification

oid eventReason_oid[] = { 1,3,6,1,4,1,22638,3,2,5,5,1,2,0 /* insert index
here */ };
size_t eventReason_oid_len = OID_LENGTH(eventReason_oid);

/* store for the variables that will be sent with the traps */
netsnmp_variable_list *SysSessionActive_vars = NULL;

snmp_varlist_add_variable( &SysSessionActive_vars,
objid_snmptrap, objid_snmptrap_len,
ASN_OBJECT_ID,
(u_char *) SysSessionActive_oid,
SysSessionActive_oid_len * sizeof(oid)
);

snmp_varlist_add_variable( &SysSessionActive_vars,
eventReason_oid, eventReason_oid_len,
ASN_OBJECT_ID,
(u_char *) &rate,
sizeof(rate)
);


DEBUGMSGTL(("example_notification", "sending the trap\n"));
send_v2trap(SysSessionActive_vars);

/*
* free the created notification variable list
*/
DEBUGMSGTL(("example_notification", "cleaning up\n"));
snmp_free_varbind(SysSessionActive_vars);

}
=============================================

Anyone got an idea what is working wrong here? Maybe some additional modules
need to be included to enable the notifications Callback functionality?

Thx in advance,
Bernhard



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