Hi,
In net-snmp version 5.3.0.1, when system date/time is changed, then the traps
are not forwarded.
We have used snmp_alarm_register_hr() with SA_REPEAT flag for forwarding traps
every 100msec.
With the following fix in snmplib/snmp_alarm.c open souce code, it is working
fine.
281 int
282 get_next_alarm_delay_time(struct timeval *delta)
283 {
284 struct snmp_alarm *sa_ptr;
285 struct timeval t_diff, t_now;
286
287 sa_ptr = sa_find_next();
288
289 if (sa_ptr) {
290 gettimeofday(&t_now, 0);
291
292 if ((t_now.tv_sec > sa_ptr->t_next.tv_sec) ||
293 ((t_now.tv_sec == sa_ptr->t_next.tv_sec) &&
294 (t_now.tv_usec > sa_ptr->t_next.tv_usec))) {
295 /*
296 * Time has already passed. Return the smallest possible
amount of
297 * time.
298 */
299 delta->tv_sec = 0;
300 delta->tv_usec = 1;
301 return sa_ptr->clientreg;
302 } else {
303 /*
304 * Time is still in the future.
305 */
306 t_diff.tv_sec = sa_ptr->t_next.tv_sec - t_now.tv_sec;
307 t_diff.tv_usec = sa_ptr->t_next.tv_usec - t_now.tv_usec;
308
309 while (t_diff.tv_usec < 0) {
310 t_diff.tv_sec -= 1;
311 t_diff.tv_usec += 1000000;
312 }
313
314 /* Fix given to handle the time change
315 to past time */
316 if((t_diff.tv_sec > sa_ptr->t.tv_sec) ||
317 ((t_diff.tv_sec == sa_ptr->t.tv_sec) &&
318 (t_diff.tv_usec > sa_ptr->t.tv_usec)))
319 {
320 sa_ptr->t_next.tv_sec = t_now.tv_sec;
321 sa_ptr->t_next.tv_usec = t_now.tv_usec;
322 t_diff.tv_sec = 0;
323 t_diff.tv_usec = 1;
324 }
325
326 delta->tv_sec = t_diff.tv_sec;
327 delta->tv_usec = t_diff.tv_usec;
328 return sa_ptr->clientreg;
329 }
330 }
331
332 /*
333 * Nothing Left.
334 */
335 return 0;
336 }
Can anyone review this fix? Can anyone mail me the procedure for modifying
net-snmp open source code?
Thanx,
Devi.U
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