DNS library for Lua

[Sean Conner <sean@...>]

  I just released a C library to encode/decode DNS queries (it also contains
a simple routine to send a query to a DNS server but that is seriously
stupid for real work) and I've included Lua bindings.  

                   http://www.conman.org/software/spcdns/

  A sample script:

local dns    = require "org.conman.dns"
local SERVER = "127.0.0.1"

encode = dns.encode {
	id       = math.random(),
	query    = true,
	rd       = true,	-- recursion desired
	opcode   = 'query',
	question = {
		name  = "conman.org.",	-- FQDN required
		type  = "LOC",		-- LOC rr
		class = "IN"
	}
}

if encode == nil then
  print("error")
  os.exit(1)
end

data = dns.query(SERVER,encode)

if data == nil then
  print("error")
  os.exit(1)
end

reply = dns.decode(data)

if reply == nil then
  print("error")
  os.exit(1)
end

if #reply.answers > 0 then
  print(string.format([[
Latitude:  %3d %2d %2d %s
Longitude: %3d %2d %2d %s
Altitude:  %d
]],
	reply.answers[1].latitude.deg,
	reply.answers[1].latitude.min,
	reply.answers[1].latitude.sec,
	reply.answers[1].latitude.hemisphere,
	reply.answers[1].longitude.deg,
	reply.answers[1].longitude.min,
	reply.answers[1].longitude.sec,
	reply.answers[1].longitude.hemisphere,
	reply.answers[1].altitude
))
end

  This isn't to say it doesn't support other record types, it does, such as
A, AAAA, MX, SOA, PTR, SRV, TXT, SPF, NAPTR and a whole bunch of other
records.  

  Questions, comments and criticisms are welcome.

  -spc (Thought this might be of interest to the Lua community)