[lwip-devel] [bug #38204] DHCP lease time not handled correctly

[Christoffer Lind]

URL:
  <http://savannah.nongnu.org/bugs/?38204>

                 Summary: DHCP lease time not handled correctly
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: christofferlind
            Submitted on: ons 30 jan 2013 16.52.04
                Category: DHCP
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: 1.4.0

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Details:

I have found some issues with the handling of the lease time which don't
comply with RFC 2131 section "4.4.5 Reacquisition and expiration". 

1. If not given, T2 should default to 87.5% of the given lease time. Currently
T2 is set to the offered lease (100%).

2. The DHCP requests that shall be sent in state DHCP_REBINDING and
DHCP_RENEWING are not sent according to the algorithm explained in section
4.4.5. Instead the same re-send algorithm that is used in DHCP_REQUESTING
state is used.

I have attached updated versions of dhcp.c and dhcp.h that solves the
explained problems.



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File Attachments:


-------------------------------------------------------
Date: ons 30 jan 2013 16.52.04  Name: dhcp.c  Size: 63 kB   By:
christofferlind

<http://savannah.nongnu.org/bugs/download.php?file_id=27351>
-------------------------------------------------------
Date: ons 30 jan 2013 16.52.04  Name: dhcp.h  Size: 8 kB   By: christofferlind

<http://savannah.nongnu.org/bugs/download.php?file_id=27352>

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