#include <string.h>
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/types.h>
#include <net-snmp/library/snmp_api.h>
#include <net-snmp/library/snmp_transport.h>
#include <net-snmp/library/snmp_client.h>
#include <net-snmp/library/system.h>

#include <string>
using namespace std;

int
snmp_input(int operation,
           netsnmp_session * session,
           int reqid, netsnmp_pdu *pdu, void *magic)
{
    return 1;
}

oid objid_sysuptime[] = { 1, 3, 6, 1, 2, 1, 1, 3, 0 };
oid objid_snmptrap[] = { 1, 3, 6, 1, 6, 3, 1, 1, 4, 1, 0 };

int
main()
{
    string peername = "localhost";
    string oid = ".1.3.6.1.4.1.8072.99999";
    string community = "trapprivate";

    netsnmp_session session;
    snmp_sess_init(&session);
    session.peername = (char*)peername.c_str();
    session.community = (u_char*)community.c_str();
    session.community_len = community.size();
    session.version = SNMP_VERSION_2c;
    session.callback = snmp_input;
    session.callback_magic = NULL;

    netsnmp_session *ss = snmp_add(&session,
                                   netsnmp_transport_open_client("snmptrap", session.peername),
                                   NULL, NULL);
    if (ss == NULL) {
        snmp_sess_perror("snmptrap", &session);
        return -1;
    }

    netsnmp_pdu *pdu = snmp_pdu_create(SNMP_MSG_TRAP2);
    if (pdu == NULL) {
        return -1;
    }
    char csysuptime[20];
    sprintf(csysuptime, "%ld", get_uptime());
    snmp_add_var(pdu, objid_sysuptime,
                 sizeof(objid_sysuptime) / sizeof(oid), 't',
                 csysuptime);
    snmp_add_var(pdu, objid_snmptrap,
                 sizeof(objid_snmptrap) / sizeof(oid), 'o',
                 oid.c_str());

    int status = snmp_send(ss, pdu);
    fprintf(stderr, "status = %d\n", status);

    snmp_close(ss);
}