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• debuggger.lua
• NSE debugging
• HOWTO Debug Lua extensions with GDB

Install Lua Debugger:

Just download debugger.lua to a directory where require() can find it:

curl -O https://raw.githubusercontent.com/slembcke/debugger.lua/master/debugger.lua

Usage:

Edit the file to debug:

local dbg = require("debugger")

Add the following anywhere (NOTE to NSE developers: this should be within the action section):

dbg()

Debugging Lua C extensions with gdb

This is straightforward:

1. Load lua into the debugger:

   gdb lua
   Reading symbols from /usr/bin/lua...(no debugging symbols found)...done.
   (gdb)
   

2. Set the breakpoint in the C code:

   (gdb) b my_c_function
   

3. Run the Lua script in gdb until the breakpoint:

   (gdb) run my_script.lua
   Starting program: /usr/bin/lua my_script.lua
   

4. Debug as any other gdb session.