learning Lua and low level data structures
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- Subject: learning Lua and low level data structures
- From: "Chris Inacio" <nacho319@...>
- Date: 2007年10月15日 10:51:24 -0400
Hello all,
I have used Lua a little bit before, (mostly as a higher level scripting language on some embedded processors.) I want to learn how to use the language better and so I thought I would try a new project in it, but I'm having trouble, and wondering if some wise soul can point me in the right direction.
I want to use Lua to create DNS requests and handle the responses --- basically a simple implementation of nslookup. I'm working on some protocol stuff, so the ability to change the packet around would be helpful here. But I can't figure out how I get Lua to create the network packet format I need. I have "Programming in Lua, 2nd. Edition" and while I find it clear and helpful, I can't find the answer.
Is there a way to create the low level structure I want, (complete with some bit mapped fields?)
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| ID |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|QR| Opcode |AA|TC|RD|RA| Z | RCODE |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| QDCOUNT |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| ANCOUNT |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| NSCOUNT |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| ARCOUNT |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
That thing. If so, how do I go about it. Pointing me in the right direction is all I'm looking for, I would like to learn the language myself.
Thanks,
Chris Inaico