Re: NSE CLI debugger

[Kris Katterjohn <katterjohn () gmail com>]

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Diman Todorov wrote:
> I moved the debugger to svn://svn.insecure.org/nmap-exp/diman so if  
> you want to try it, you need to get these sources instead of trunk.
>
> cheers,
> Diman

Hey Diman,

I *love* this debugger! :)

Being able to list the local and global variables (locs and glob) is
very neat.

These are two my favorite aspects (perhaps only so far):

- - Being able to run your own line in the current context is interesting!

- - The dump command is great!  This is testing with your paused
showHTMLTitle script run against my machine:

[DEBUG]> dump host
host = {  -- table: 0x8167118
  name = "localhost";
  bin_ip = <removed>
  directly_connected = true;
  bin_ip_src = <removed>
  interface = "lo";
  ip = "127.0.0.1";
};
[DEBUG]> dump port
port = {  -- table: 0x817df08
  number = 80;
  version = table: 0x817f5c0
  protocol = "tcp";
  service = "http";
  state = "open";
  reason = "syn-ack";
};
[DEBUG]> dump port.version
port.version = {  -- table: 0x817f5d0
  name_confidence = 3;
  name = "http";
  rpc_status = "untested";
  service_tunnel = "none";
  service_fp = "table";
};

That's very cool!  The other commands along these same lines (vars,
fenv, etc.) are cool as well.


The debugger does crap out sometimes:

[DEBUG]> what stdnse.strsplit
Lua in ./nselib/stdnse.lua 23..43
[DEBUG]> what stdnse.nonexistent
SCRIPT ENGINE: ./nselib/debugger.lua:784: ./nselib/debugger.lua:1093:
attempt to concatenate local 'v' (a nil value)
<Nmap continues with script engine>

Adding another check in there for nonexistent symbols and then just
printing a warning would be best IMO.


I think this debugger would make a great addition to NSE.  Hopefully you
can merge it back over sometime soon.

Thanks,
Kris Katterjohn

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