Hi,
I've observed a bug in the handling of engineBoots/engineTime when the agent
being reconfigured. The bug was identified in 5.4.1.2, but I believe 5.5 is
also affected.
At startup, the agent sets engineTime to zero, reads engineBoots from the
persistent conf file and increments it as expected.
When a reconfig occurs (ie kill -HUP), the engineBoots value used by the agent
is incremented internally but the new value is not written back to the
persistent conf. engineTime is not reset to zero. If the agent is then killed
and restarted, the previous engineBoots is read from the conf file and
incremented, resulting in the reuse of the last engineBoots value. To clients
unaware of the agent restart, this looks like engineTime is being reset.
Eg:
snmpd(pid=657): engineTime=397, engineBoots=182 (in snmpd.conf=182)
> kill -HUP 657
snmpd(pid=657): engineTime=417, engineBoots=183 (in snmpd.conf=182)
> kill -9 657
snmpd(pid=685): engineTime=18, engineBoots=183 (in snmpd.conf=183)
I've looked at the relevant source code and the attached patch (on 5.4.1.2)
seems to fix the problem. Are there any negative side-effects of changing the
handler in this way that need to be considered?
Regards,
Mark Ware
--- ../orig/snmplib/snmpv3.c 2008-08-08 11:39:15.000000000 +1000
+++ snmplib/snmpv3.c 2009-10-02 13:30:05.000000000 +1000
@@ -1294,8 +1294,8 @@ init_snmpv3(const char *type)
engineIDType_conf, NULL, "num");
register_prenetsnmp_mib_handler(type, "engineIDNic", engineIDNic_conf,
NULL, "string");
- register_config_handler(type, "engineBoots", engineBoots_conf, NULL,
- NULL);
+ register_prenetsnmp_mib_handler(type, "engineBoots", engineBoots_conf,
NULL,
+ NULL);
/*
* default store config entries
------------------------------------------------------------------------------
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