Hello,
I am using netsnmp 5.4 , i have written a code that will send trap
to main agent i.e. snmpd, for this i have return a module that have
following function i.e.
1 ) initialize()
doing snmp initialization in this function i.e
if (netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_ROLE, 1) != 0)
return ERROR;
//
// for this i also modified snmpd.conf so that main agent
// listen on correct port
if (netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_X_SOCKET, "tcp:localhost:705") !=0 )
return ERR_NETSNMP;
while(i< 4) {
ret_val = init_agent("subagent");
if(ret_val == 0)
break;
sleep(2);
i++;
}
if(ret_val != 0)
return ERR_NETSNMP;
init_snmp("subagent");
2) trap_send
send trap to main agent i.e. snmpd
using following api
snmp_varlist_add_variable
sendv2_trap
snmp_free_varbind
3) destroy
snmp_shutdown("sub-agent");
shutdown_agent();
when my program starts it call initialize then for sending trap it
call
trap_send function. when main program dont want to send trap
it call destroy & stop main agent & problem occurs when main program
want to send
trap again then it again start Main agent then call initialization
function & when it call
initialization then after that trap send by program not received by
main agent
ie flow is like this
(start snmpd)
initialize
|
trap_send
|
destroy
( stop snmpd)
|
(start snmpd)
initialize
|
trap_send (then trap send here not received by
Main agent
because I think no
initialization done in init_snmp thats why)
I seen some code of netsnmp in init_snmp function if we are calling
first time
then it will do further processing & if we are calling for second time
then it will just
return by not doing anything, this is code of init_snmp
void init_snmp(const char *type)
{
static int done_init = 0; /* To prevent double
init's. */
if (done_init) {
return;
}
done_init = 1;
/*
* make the type available everywhere else
*/
if (type && !netsnmp_ds_get_string(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_APPTYPE)) {
netsnmp_ds_set_string(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_APPTYPE, type);
}
.
.
.
.
}
and as far as i know in init_snmp function subagent will send some packet
to
main agent, & because of this that packet won't send by subagent, so trap
not received by main agent
One more question i want ask
I want prepare application which will at start main agent then call
initialize then trap_send,
& when i don't want to send trap it will call destroy & then stop main
agent i.e snmpd
& then afterward when I want to send trap then my application will again
start Main agent i.e snmpd
call initialize then trap_send accordingly, thats why i want to call
init_snmp
again, but it will return by not doing anything so what should i do ?.
Thanks in Advance
Regards
bhushan. E . Sonawane
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