check_dhcp
Warren Block
wblock at wonkity.com
Fri Jul 25 03:14:28 UTC 2014
net-mgmt/monitoring-plugins has a check_dhcp program used to test the
availability of a remote DHCP server. It has BSD-specific code, but
seems fairly dated and only works when all supposedly optional
parameters are given. However, it does work on a normal machine:
OK: Received 1 DHCPOFFER(s), 1 of 1 requested servers responded, max lease time = 600 sec.
But it does not work inside a jail, seeing no offers:
CRITICAL: No DHCPOFFERs were received.
Raw sockets and bpf are enabled in the jail. dhclient in the jail can
actually get a lease. Is there anything else that needs to be
configured to allow this to work in a jail?
After 'make -C /usr/ports/net-mgmt/monitoring-plugins', the code in
question is check_dhcp.c in
work/monitoring-plugins-monitoring-plugins-b5611ea/plugins-root. It
gives these type of errors:
% ./check_dhcp -s 192.168.1.1
Error: if_nametoindex error - Device not configured.
% ./check_dhcp -s 192.168.1.1 -i em0
Error: Couldn't get hardware address from em0. sysctl 2 error - No such file or directory.
After adding -m <jail card's MAC>, it gives no errors but never sees a
response.
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