Fix a bug in calculating wakeup time on 64-bit machines.

If you had TIME_MAX > INT_MAX, and your "time_to_exhaust_bw =
accountingmax/expected_bandwidth_usage * 60" calculation managed to
overflow INT_MAX, then your time_to_consider value could underflow and
wind up being rediculously low or high.  "Low" was no problem;
negative values got caught by the (time_to_consider <= 0) check.
"High", however, would get you a wakeup time somewhere in the distant
future.

The fix is to check for time_to_exhaust_bw overflowing INT_MAX, not
TIME_MAX: We don't allow any accounting interval longer than a month,
so if time_to_exhaust_bw is significantly larger than 31*24*60*60, we
can just clip it.

This is a bugfix on 0.0.9pre6, when accounting was first introduced.
It fixes bug 2146, unless there are other causes there too.  The fix
is from boboper.  (I tweaked it slightly by removing an assignment
that boboper marked as dead, and lowering a variable that no longer
needed to be function-scoped.)

changes/bug2146.1

@@ -0,0 +1,4 @@
+  - Major bugfixes:
+    o Fix a bug that could break accounting on 64-bit systems with large
+      time_t values, making them hibernate for impossibly long intervals.
+      Bugfix on 0.0.9pre6; fix for bug 2146; fix by boboper.

src/or/hibernate.c

@@ -515,7 +515,6 @@ accounting_run_housekeeping(time_t now)
 static void
 accounting_set_wakeup_time(void)
 {
-  char buf[ISO_TIME_LEN+1];
   char digest[DIGEST_LEN];
   crypto_digest_env_t *d_env;
   int time_in_interval;
@@ -530,6 +529,7 @@ accounting_set_wakeup_time(void)
   }
 
   if (server_identity_key_is_set()) {
+    char buf[ISO_TIME_LEN+1];
     format_iso_time(buf, interval_start_time);
 
     crypto_pk_get_digest(get_server_identity_key(), digest);
@@ -548,7 +548,6 @@ accounting_set_wakeup_time(void)
     char buf2[ISO_TIME_LEN+1];
     format_local_iso_time(buf1, interval_start_time);
     format_local_iso_time(buf2, interval_end_time);
-    time_to_exhaust_bw = GUESS_TIME_TO_USE_BANDWIDTH;
     interval_wakeup_time = interval_start_time;
 
     log_notice(LD_ACCT,
@@ -563,8 +562,8 @@ accounting_set_wakeup_time(void)
 
   time_to_exhaust_bw =
     (get_options()->AccountingMax/expected_bandwidth_usage)*60;
-  if (time_to_exhaust_bw > TIME_MAX) {
-    time_to_exhaust_bw = TIME_MAX;
+  if (time_to_exhaust_bw > INT_MAX) {
+    time_to_exhaust_bw = INT_MAX;
     time_to_consider = 0;
   } else {
     time_to_consider = time_in_interval - (int)time_to_exhaust_bw;
@@ -582,8 +581,6 @@ accounting_set_wakeup_time(void)
      * to be chosen than the last half. */
     interval_wakeup_time = interval_start_time +
       (get_uint32(digest) % time_to_consider);
-
-    format_iso_time(buf, interval_wakeup_time);
   }
 
   {