[Bug 14361] New: udhcpc ignores T1 and T2 values

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=14361

            Bug ID: 14361
           Summary: udhcpc ignores T1 and T2 values
           Product: Busybox
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Networking
          Assignee: unassigned at busybox.net
          Reporter: luke-jr+busyboxbugs at utopios.org
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

It seems the code just hard-coded T1 at half the lease time

https://git.busybox.net/busybox/tree/networking/udhcp/dhcpc.c?h=1_34_stable#n1802

Values provided by the DHCP server (opt 58, 59) just get ignored...

Use case: I issue 24 hour leases, and want the lease to be used that long if
necessary (eg, if router is down), but I also want DHCP renewals every minute
so: 1) I can rapidly give static IP leases and have the clients pick up on
them; and 2) router reboots can quickly rebuild their lease table without
persistent state.

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