[Nagiosplug-devel] [ nagiosplug-Bugs-1090549 ] check_dhcp ignores DHCP replies

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Sun Jan 2 12:49:19 UTC 2005


Bugs item #1090549, was opened at 2004-12-24 09:21
Message generated for change (Comment added) made by reuben
You can respond by visiting: 
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Category: None
Group: v1.3.0 beta3
Status: Open
Resolution: None
Priority: 5
Submitted By: L.C. (Laurentiu C. Badea) (wotevah)
Assigned to: Benoit Mortier (opensides)
Summary: check_dhcp ignores DHCP replies

Initial Comment:
check_dhcp ignores the DHCP replies apparently because
they are broadcast to 255.255.255.255.

<CLIENT>.bootpc > 255.255.255.255.bootps: BOOTP/DHCP,
Request from <mac>, length: 548, flags: [Broadcast]
<SERVER>.bootps > 255.255.255.255.bootpc: BOOTP/DHCP,
Reply, length: 420, flags: [Broadcast] (0x8000)

I believe the problem may be that recvfrom is not
expecting a possible broadcast packet in response, so
it ignores it. Relevant part from strace below:

sendto(3, <packet>, 548, 0, {sa_family=AF_INET,
sin_port=htons(67),
sin_addr=inet_addr("255.255.255.255")}, 16) = 548
time([1103833074])                      = 1103833074
time([1103833074])                      = 1103833074
select(4, [3], NULL, NULL, {2, 0})      = 1 (in [3],
left {1, 999000})
recvfrom(3, 0xfef67370, 548, 2, 0xfef67280, 0xfef67274)
= -1 EINVAL (Invalid argument)
recvfrom(3, 0xfef67370, 548, 0, 0xfef67280, 0xfef67274)
= -1 EINVAL (Invalid argument)

Client is Fedora Core 2 with
nagios-plugins-1.3.1-10.1.fc2.dag.
Server is Red Hat 9 with dhcp-3.0pl1-23.


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Comment By: Reuben Farrelly (reuben)
Date: 2005-01-03 09:48

Message:
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user_id=26209

Still no go here either using bleeding edge CVS (on FC3):

sendto(3,
"\1\1\6\0\6\372\275\241\377\0\200\0\0\0\0\0\0\0\0\0\0\0"...,
548, 0, {sa_family=AF_INET, sin_port=htons(67),
sin_addr=inet_addr("255.255.255.255")}, 16) = 548
time([1104698558])                      = 1104698558
time([1104698558])                      = 1104698558
select(4, [3], NULL, NULL, {2, 0})      = 0 (Timeout)
time([1104698560])                      = 1104698560
close(3)                                = 0

Returns with "DHCP problem: No DHCPOFFERs were received." 
Meanwhile the DHCP server has seen the DHCPDISCOVER come in
and DHCPOFFER'ed an address to 255.255.255.255.bootpc

----------------------------------------------------------------------

Comment By: Benoit Mortier (opensides)
Date: 2005-01-03 07:42

Message:
Logged In: YES 
user_id=388184

Hi, 
 
could you test with the lastest cvs, and report your findings 
 
Thanks 

----------------------------------------------------------------------

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