check_dns on freebsd

[David Bishop]

I just discovered why check_dns was failing for me (this is unrelated to
my other problem).  On FreeBSD, /usr/sbin/nslookup needs a dash in front
of the name of the dns server to use, otherwise it thinks that you are
passing two names to look up  instead of just one.  For instance, by
default check_dns constructs a command-line of /usr/sbin/nslookup
<target_host> <server_to_use>.  It should be /usr/sbin/nslookup
<target_host> -<server_to_use>.  Once I added the dash to the asprintf
line where command_line is constructed, it worked great.  I presume this
needs to be wrapped in some sort of IFDEF FREEBSD, but I left that as an
exercise for the maintainer :-)

D.A.Bishop


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