why my modified snmptrapd often lose trap messages-_-

hi
  I modified snmptrapd file, add a global trap handler by myself, and I 
delete some instructuions of standard snmptrapd(I think it maybe useless), 
and It runs ok, but I find a problem, when sending trap messages after my 
snmptrapd program started for one minute, my deamon couldn't receive the 
trap messages or couldn't invoke my global trap handler..I don't konw why? 
did I delete crucial code of original snmptrapd??

following is my thin snmptraps code:

start_trapd like main funtion!

int start_trapd()
{
    netsnmp_session *sess_list = NULL, *ss = NULL;
    netsnmp_transport *transport = NULL;
    int             i = 0, depmsg = 0;
    int             count, numfds, block;
    fd_set          fdset;
    struct timeval  timeout, *tvp;
    int             dofork = 1;
    char           *cp, *listen_ports = NULL;
    char           *trap1_fmt_str_remember = NULL;

//#ifdef SIGTERM
//    signal(SIGTERM, term_handler);
//#endif
//#ifdef SIGHUP
//    signal(SIGHUP, hup_handler);
//#endif
//#ifdef SIGINT
//    signal(SIGINT, term_handler);
//#endif
//#ifdef SIGPIPE
//    signal(SIGPIPE, SIG_IGN);   /* 'Inline' failure of wayward readers */
// #endif

    /*
     * we need to be called back later 
     */
    snmp_register_callback(SNMP_CALLBACK_LIBRARY, SNMP_CALLBACK_STORE_DATA,
                           usm_store_users, NULL);

#ifdef WIN32
    setvbuf(stdout, NULL, _IONBF, BUFSIZ);
#else
    setvbuf(stdout, NULL, _IOLBF, BUFSIZ);
#endif

	/*
     * don't fail if we can't do agentx (ie, socket not there, or not root) 

     */
    netsnmp_ds_toggle_boolean(NETSNMP_DS_APPLICATION_ID, 
			      NETSNMP_DS_AGENT_NO_ROOT_ACCESS);
    /*
     * ignore any warning messages.
     */
    netsnmp_ds_toggle_boolean(NETSNMP_DS_APPLICATION_ID, 
			      NETSNMP_DS_AGENT_NO_CONNECTION_WARNINGS);

    /*
     * initialize the agent library 
     */
    init_agent("snmptrapd");

/*
	add trap message handler
	--anders
*/
	netsnmp_add_global_traphandler(NETSNMPTRAPD_POST_HANDLER, 
trap_message_handler);

    /*
     * Initialize the world. Create initial user 
     */
//    init_snmp("snmptrapd");
//    if (trap1_fmt_str_remember) {
//        free_trap1_fmt();
//        free_trap2_fmt();
//        print_format1 = strdup(trap1_fmt_str_remember);
//        print_format2 = strdup(trap1_fmt_str_remember);
//    }

    if (netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID, 
			       NETSNMP_DS_AGENT_QUIT_IMMEDIATELY)) {
        /*
         * just starting up to process specific configuration and then
         * shutting down immediately. 
         */
        running = 0;
    }

     SOCK_STARTUP;

    if (listen_ports)
        cp = listen_ports;
    else
        cp = default_port;

    while (cp != NULL) {
        char *sep = strchr(cp, ',');
        char  listen_name[128];
        char *cp2 = strchr(cp, ':');

        if (sep != NULL) {
            *sep = 0;
        }

           /*
            * Make sure this defaults to listening on port 162
            */
        if (!cp2) {
            snprintf(listen_name, sizeof(listen_name), "%s:162", cp);
            cp2 = listen_name;
        } else {
            cp2 = cp;
        }
        transport = netsnmp_tdomain_transport(cp2, 1, "udp");
        if (transport == NULL) {
//            snmp_log(LOG_ERR, "couldn't open %s -- errno %d (\"%s\")\n",
//                     cp2, errno, strerror(errno));
            snmptrapd_close_sessions(sess_list);
            SOCK_CLEANUP;
            exit(1);
        } else {
            ss = snmptrapd_add_session(transport);
            if (ss == NULL) {
                /*
                 * Shouldn't happen?  We have already opened the transport
                 * successfully so what could have gone wrong?  
                 */
                snmptrapd_close_sessions(sess_list);
                netsnmp_transport_free(transport);
//                if (Syslog) {
//                    snmp_log(LOG_ERR, "couldn't open snmp - %m");
//                }
                SOCK_CLEANUP;
                exit(1);
            } else {
                ss->next = sess_list;
                sess_list = ss;
            }
        }

        /*
         * Process next listen address, if there is one.  
         */

        if (sep != NULL) {
            *sep = ',';
            cp = sep + 1;
        } else {
            cp = NULL;
        }
    }

    /*
     * ignore early sighup during startup
     */
    reconfig = 0;

//#ifdef WIN32SERVICE
//    trapd_status = SNMPTRAPD_RUNNING;
//#endif
    while (running) {
        if (reconfig) {
             reconfig = 0;
        }
        numfds = 0;
        FD_ZERO(&fdset);
        block = 0;
        tvp = &timeout;
        timerclear(tvp);
        tvp->tv_sec = 5;
        snmp_select_info(&numfds, &fdset, tvp, &block);
        if (block == 1)
            tvp = NULL;         /* block without timeout */
        count = select(numfds, &fdset, 0, 0, tvp);
        gettimeofday(&Now, 0);
        if (count > 0) {
            snmp_read(&fdset);
        } else
            switch (count) {
            case 0:
                snmp_timeout();
                break;
            case -1:
                if (errno == EINTR)
                    continue;
//                 snmp_log_perror("select");
                running = 0;
                break;
            default:
//                 fprintf(stderr, "select returned %d\n", count);
                running = 0;
            }
	run_alarms();
    }

    if (Print || Log) {
        struct tm      *tm;
        time_t          timer;
        time(&timer);
        tm = localtime(&timer);
    }


    snmptrapd_close_sessions(sess_list);
    snmp_shutdown("snmptrapd");
//#ifdef WIN32SERVICE
//    trapd_status = SNMPTRAPD_STOPPED;
//#endif
    snmp_disable_log();
    SOCK_CLEANUP;
    return 0;
}

int trap_message_handler(netsnmp_pdu	     *pdu,
                       netsnmp_transport     *transport,
                       netsnmp_trapd_handler *handler)
{
	char *strIpAddress;
	struct in_addr sInAddr;
	char oidBuf[200];
	struct variable_list *vars;

	memset(oidBuf, 200, 0);

	//parse pdu->enterprise variable to string
	snprint_objid(oidBuf, 200, pdu->enterprise, pdu->enterprise_length);
	
	//covert agent_addr to string ip address
	sInAddr.S_un.S_un_b.s_b1 = pdu->agent_addr[0];
	sInAddr.S_un.S_un_b.s_b2 = pdu->agent_addr[1];
	sInAddr.S_un.S_un_b.s_b3 = pdu->agent_addr[2];
	sInAddr.S_un.S_un_b.s_b4 = pdu->agent_addr[3];
	strIpAddress = inet_ntoa(sInAddr);

	//print basic information
	printf("Agent address  : %s\n", strIpAddress);
	printf("Enterprise     : %s\n", oidBuf);
	printf("Generic trap   : %d\n", pdu->trap_type);
	printf("Sepecific trap : %d\n", pdu->specific_type);
	printf("Time stamp     : %d\n", pdu->time);

	//print variable
	printf("Bind variable  :\n");
	for (vars = pdu->variables; vars; vars = vars->next_variable)
	{
		char buf[1000];
		memset (buf, 1000, 0);
		//snprint_variable (buf, 1000, vars->name, vars->name_length, vars);
		print_variable(vars->name, vars->name_length, vars);
	}
	printf("--------------------------\n");
	return 1;
}


Best Regards
Anders

_________________________________________________________________
涓虹杩琛浜ゆ锛璇蜂娇 MSN Messenger:  http://messenger.msn.com/cn  



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