Re: Traps/Informs

Hi Martin,

Please use the following code after your mentioned part of code.

You need to call "snmp_sess_select_info", "select" and "snmp_sess_read"
after snmp_sess_read() function. These functions help in reading the data
from socket and call the callback function.

Also, there is no issue in using localhost in snmptrap/snmpinform commands.

if (transport = netsnmp_tdomain_transport(port, 1, "udp")) {
        ss = snmp_sess_add(&session, transport, NULL, NULL);
    }

    while (1) {
        numfds = 0;
        FD_ZERO(&fdset);
        block = 1;    /* note: will be set by snmp_sess_select_info */
        tvp = &timeout;

        if (block) timerclear(tvp);

        snmp_sess_select_info(ss,&numfds, &fdset, tvp, &block);

        if (block == 1) {
            tvp = NULL;
        }


        count = select(numfds, &fdset, 0, 0, tvp);

            if (count > 0) {
                snmp_sess_read (ss,&fdset);
            } else
        ....
        ....
    } /* End of while */

    if (ss) {
        snmp_sess_close(ss);
        ss = NULL;
    }


Thanks
Gaurav Chaturvedi

On Tue, Jul 20, 2010 at 10:13 PM, Martin Townsend <
[email protected]> wrote:

> Hi,
>
> I'm having problems processing traps in my management application, After
> looking through the snmptrapd code I've added calls to
> netsnmp_transport_open_server(app_name, "udp:162");
> and then initialise a session with
> snmp_sess_init
> with the following initialisation
>     session_p->peername = SNMP_DEFAULT_PEERNAME;  /* Original code had
> NULL here */
>     session_p->version = SNMP_DEFAULT_VERSION;
>     session_p->community_len = SNMP_DEFAULT_COMMUNITY_LEN;
>     session_p->retries = SNMP_DEFAULT_RETRIES;
>     session_p->timeout = SNMP_DEFAULT_TIMEOUT;
>     session_p->callback = snmp_input;
>     session_p->callback_magic = (void *) transport_trap_server_p;
>     session_p->authenticator = NULL;
>     session_p->isAuthoritative = SNMP_SESS_UNKNOWNAUTH;
>
> which sets up the callback snmp_input.
> then snmp_add to add the session to the opened transport server.
>
> In snmp_input I have a printf to make sure that the routine is getting
> called that will output the operation_id value.
>
> Then using snmptrap or snmpinform send the trap, e.g.
> snmpinform -v2c -c public localhost ""
> PO-RECTIFIER-TEST-MIB::alarmMajorHighBattVoltTrapPO PO-RECTIFIER-TEST-M
> IB::alarmMajorHighBattVoltPO.0 i 1
> snmpinform: Timeout
>
> with no success.
>
> Is it ok to use snmpinform/trap with localhost and will the code above
> receive the trap PDU on localhost?
> My application runs as a process that waits for commands to arrive over
> a socket so it will be blocked, would this cause problems?
> Any other ideas/things to try out?
>
> Many Thanks in advance,
> Martin.
>
>
>
>
>
>
>
>
>
>
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