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

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Bugs item #1090549, was opened at 2004-12-23 12:21
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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: Nobody/Anonymous (nobody)
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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