MS SQL NSE scripts run on database instances, which can be TCP or named
pipes. With this change, all TCP instances on scanned ports will have
script output attached under the port as a portrule script. Named pipe
instances and TCP instances on unscanned ports will be displayed in the
hostrule script output at the end of the host's output. Utility function
mssql.Helper.InitScript makes it easy to write scripts that just work on
a per-instance basis, without bothering where to put the output.
Discovery will be done once per host, regardless of how many scripts are
run, and can be guaranteed to be done before the script's action takes
place.
A script might check WasDiscoveryPerformed and get a negative response,
then call Discover, during which time another script already called
Discover. Instead, check the condition *after* acquiring the mutex.
for lib in nselib/*.lua*; do l=${lib#*/}; l=${l%.lua*}; find . -name \
\*.lua -o -name \*.nse | xargs grep -l "require .$l\>" | xargs grep \
-c "\<$l\." | grep ':0$' | awk -F: '{print "'$l'", $1}'; done
Did not remove calls to stdnse.silent_require since these can be used to
abort script execution if OpenSSL is not included, even if the script
does not directly call openssl.* (perhaps it uses comm.tryssl instead,
for instance).
Also did not remove require "strict", since that library is special and
modifies the environment.
