Check for error 71 (0x47), which means the server is simply not a master
or backup browser and will not respond.
Also teardown the SMB session as far as it has been established, to be
nice.
Windows uses UTF-16 little-endian. Since this is a common use case,
utility functions are provided such that this:
x = unicode.utf16to8(v)
is equivalent to this:
x = unicode.encode(unicode.decode(v, unicode.utf16_dec),
unicode.utf8_enc)
but faster (fewer intermediate tables)
Using this regular expression, '\(\w*\)\s*=\s*\1\s*\.\.', found and
replaced many string concatenation-reassignments. These can cause
performance issues, since a new string gets allocated for each
reassignment. In many cases, the replacement is simply a single string,
wrapped across lines with the '\z' escape, which consumes a newline and
whitespace following it. In other cases, a table is used to hold the
substrings until the final string is built with a single table.concat
operation (same technique used in stdnse.strbuf).
Also, some string-building loops of this form:
s = ""
for i = 1, 100, 1 do
s = s .. "\0"
end
were replaced with this much faster and cleaner version:
s = string.rep("\0", 100)
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.
stdnse.print_debug accepts a format string and arguments, making
string.format redundant in calls of this form:
stdnse.print_debug(1, string.format("%s: error", SCRIPT_NAME))
stdnse.print_debug(("length %d"):format(#tab))
These can be rewritten as:
stdnse.print_debug(1, "%s: error", SCRIPT_NAME)
stdnse.print_debug("length %d", #tab)
Mostly in documentation (the description field, for instance), but also
some long literal strings. Lua 5.2 introduces a string escape, "\z",
which escapes any amount of subsequent whitespace, including newlines.
This can be used to wrap string literals without upsetting indentation.
http://www.lua.org/manual/5.2/manual.html#3.1
The example uses of nmap.receive_buf() were missing the second
parameter, keeppattern. Also referenced the match library from
nmap.receive_buf's NSEdoc to avoid reimplementations of buffered
sockets.
Mostly found with:
for i in nselib/*.lua scripts/*.nse; do
echo $(perl -lne 'BEGIN{$a=$p=0}next unless $_;/^(\s*)/;' \
-e '$l=length$1;next if$l==$p;$a+=(abs($l-$p)-$a)/$.;' \
-e '$p=$l;END{print$a}' $i) $i
done | sort -nr
And indented with: https://gist.github.com/bonsaiviking/8845871
whois-ip.nse was particularly mangled (probably my fault due to using
vim's built-in indentation script, but it could be structured better)
