Re: LUA "Invalid Escape Sequence" error with NMAP 6.25

[Patrick Donnelly <batrick () batbytes com>]

Hello Aaron,

On Sat, Dec 15, 2012 at 9:52 AM, Aaron Giuoco <afxdub () gmail com> wrote:
> Starting Nmap 6.25 ( http://nmap.org ) at 2012-12-15 08:40 Central Standard
> Time
>
> NSE: failed to initialize the script engine:
> nmap-6.25/nse_main.lua:659: Bad script rule:
>         http-screenshot-html.nse ->  invalid escape sequence near '\U'
> stack traceback:
>         [C]: in function 'error'
>         nmap-6.25/nse_main.lua:659: in function 'get_chosen_scripts'
>         nmap-6.25/nse_main.lua:1239: in main chunk
>         [C]: in ?
>
> QUITTING!

This error is caused by what you pass to --script, not your
http-screenshot-html.nse script. I assume you did something like (and
sanitized the output you pasted?):

--script "C:\Users\aaron\http-screenshot-html.nse"

The problem is the Lua 5.2 interpreter does not allow strings to
contain unknown escape sequences, in this case '\U'. I don't think you
(the user) should need to escape these backslashes so I consider this
a bug. I have committed a fix in r30411. Please confirm if this
corrects the issue for you.

--
- Patrick Donnelly
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