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[Bug 1001633] New: DHCP Client may hang
- From: bugzilla-daemon at bugs dot ecos dot sourceware dot org
- To: unassigned at bugs dot ecos dot sourceware dot org
- Date: Thu, 26 Jul 2012 10:21:52 +0100
- Subject: [Bug 1001633] New: DHCP Client may hang
- Auto-submitted: auto-generated
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Summary: DHCP Client may hang
Product: eCos
Version: CVS
Platform: All
OS/Version: All
Status: UNCONFIRMED
Severity: normal
Priority: normal
Component: Ethernet
AssignedTo: unassigned@bugs.ecos.sourceware.org
ReportedBy: bernd.edlinger@hotmail.de
CC: ecos-bugs@ecos.sourceware.org
Class: Advice Request
Bernd Edlinger <bernd.edlinger@hotmail.de> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flag| |Patch_or_Contribution+
Created an attachment (id=1847)
--> (http://bugs.ecos.sourceware.org/attachment.cgi?id=1847)
proposed patch to fix this defect
when a DHCP Response is received it should contain a time slice value.
however if the time slice value is zero, the device enters an endless loop.
Hence, this configuration error in the DHCP server crashes the devices.
Reproduce:
install tftpd32 on an own subnet, and configure the dhcp server
to use zero-length time slices.
The time slice value is not checked by the dhcp server, and just used as is.
When the eCos DHCP Client is booted, it gets an address assigned, and freezes
immediately, for instance no ping or arp responses are sent.
Additionally, the code that sends new dhcp requests
uses a wrong formula for bp_secs:
bp_secs = cyg_current_time() / 100;
But that is only correct for 100 Ticks/second.
bp_secs = cyg_current_time() /
((1000000000LL*CYGNUM_HAL_RTC_DENOMINATOR)/CYGNUM_HAL_RTC_NUMERATOR);
Howto Fix:
Attached you will find a patch for the file
"ecos/packages/net/common/current/src/dhcp_prot.c"
which checks for zero timeout and silently changes this to 1 second timeout.
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