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[lwip-devel] [bug #52704] DHCP and bad OFFER
From: |
Dirk Ziegelmeier |
Subject: |
[lwip-devel] [bug #52704] DHCP and bad OFFER |
Date: |
Wed, 20 Dec 2017 04:08:46 -0500 (EST) |
User-agent: |
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:57.0) Gecko/20100101 Firefox/57.0 |
URL:
<http://savannah.nongnu.org/bugs/?52704>
Summary: DHCP and bad OFFER
Project: lwIP - A Lightweight TCP/IP stack
Submitted by: dziegel
Submitted on: Wed 20 Dec 2017 09:08:44 AM UTC
Category: DHCP
Severity: 3 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Planned Release: None
lwIP version: 2.0.3
_______________________________________________________
Details:
Hello,
DHCP implementation seems to have minor bug. If DHCP server sends OFFER
without Server Identifier-field, LwIP stops sending DISCOVER messages (one
fieldbus conformance tester does this).
I didn't check RFC what actually should be done in this case, but I think that
it should at least continue sending DISCOVERY messages.
In code before dhcp.c: dhcp_handle_offer() is called, DHCP timer is stopped
(dhcp->request_timeout = 0;), then
dhcp_handle_offer() just prints error if it rejects the OFFER.
We are still using 1.4.1 but master seems to have identical code for
dhcp_handle_offer().
br,
Esa Hill
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- [lwip-devel] [bug #52704] DHCP and bad OFFER,
Dirk Ziegelmeier <=