externalscripts/certificate_expiration-bsd: Certificate expiration check (BSD date(1) variant) as external check (via TCP)
# Checks DNS A record $1 on server $2
# Returns exit code of host(1) command: 0 - Ok, 1 - error
# (Hint: define value map for 0, 1)
UserParameter=host[*],host -W 3 $1 $2 > /dev/null; echo $?