BIND 10 #2413: Handle time overflow in lease structures

[BIND 10 Development]

#2413: Handle time overflow in lease structures
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            Reporter:  stephen  |                        Owner:
                Type:  defect   |                       Status:  new
            Priority:  medium   |                    Milestone:  DHCP 2012
           Component:  dhcp     |                     Keywords:
           Sensitive:  0        |              Defect Severity:  N/A
         Sub-Project:  DHCP     |  Feature Depending on Ticket:
Estimated Difficulty:  0        |          Add Hours to Ticket:  0
         Total Hours:  0        |                    Internal?:  0
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 Currently the cltt in a lease structure is expressed as a time_t, and the
 valid lifetime field as a uint32_t.  The expiration time of the lease is
 stored in the database and is calculated as
 {{{
 expiration = cltt + valid_lifetime
 }}}
 With no restriction on valid_lifetime, it is easy for the time calculation
 to overflow. (On a 32-bit system, time_t is 32-bits).

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Ticket URL: <http://bind10.isc.org/ticket/2413>
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