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[lwip-devel] [bug #38203] DHCP options are not recorded in all DHCP ack

From: Christoffer Lind
Subject: [lwip-devel] [bug #38203] DHCP options are not recorded in all DHCP ack messages
Date: Wed, 30 Jan 2013 15:43:22 +0000
User-agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.56 Safari/537.17


                 Summary: DHCP options are not recorded in all DHCP ack
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: christofferlind
            Submitted on: ons 30 jan 2013 15.43.21
                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



The code in dhcp_recv() only calls the function dhcp_handle_ack() if the
current state is DHCP_REQUESTING. According to RFC 2131 "4.4 DHCP client
behavior" the client shall record the lease time in state DHCP_REBOOTING,
DHCP_REBINDING and DHCP_RENEWING as well. As far as I understand from the RFC
this applies to all options (not only the lease time) and the options shall be
updated in all 4 states.

Another thing I noticed was that the server_ip_addr is only updated in
dhcp_handle_offer. This should also be updated in dhcp_handle_ack.


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