dlz_lua

This is dlz_lua, a dlopen() back-end to BIND, tested with 9.9.0b2, though it ought to work with any version which supports dlopen().

Steps:

1. Compile the driver, which ought to create a dlz_lua.so.
2. Add the driver to your named.conf using the sample provided.
3. Restart BIND and cross your fingers. :)
4. After modifying your Lua script, run rndc reconfig to force BIND to reload the driver.

Examples

The Lua script example.lua contains a lookup function which returns a few "special" answers. (Thank you to the people I swiped some of this code from. ;-)

Timestamp

$ dig +noall +answer time.example.nil any
time.example.nil.  0  IN  TXT  "2011-12-01T10:41:48+0100"

Random password generator

$ dig +noall +answer password.example.nil txt
password.example.nil.  0  IN  TXT  "$lf#k4$?72i1X7M"

Help me

I'm anything but a Lua expert, so I need your help.

• For example, the bindlog function I define in C, but which gets called from Lua, I want to pass a "state" pointer from C into Lua and back into C. Currently, bindlog() prints to stderr, but I need to be able to syslog() it via named, for which I need this state. How can I do that? Solved by Peter van Dijk with this patch.

Files in this directory:

• dlz_minimal.h is a copy from BIND's contrib/dlz/example.

Requirements

• BIND with dlopen()
• Lua