making DNS Query Packet - socket programming

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hi,

this is my first post.
i want make DNS packet to send to port 53 (DNS SERVER) and get reply.

the problem is that i dont know how to make the packet.

i know the stracture is : Header - Question - Anwser - Authority - additional

but i dont know how to put each byte in each section...

for example help me to make packet fo www.google.com;

tnx

Posted 16-Nov-13 0:02am

Sajad Hoseinpoor

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Richard MacCutchan 16-Nov-13 6:57am

Since you have not told us what language your program is written in it is difficult to make a valid suggestion.

Sajad Hoseinpoor 16-Nov-13 14:34pm

i use c# .net 3.5 - help me how to code and make the structure of packet.tnx

Richard MacCutchan 17-Nov-13 5:32am

Just create a byte array and set each byte to the values as required by the protocol. The Google search I provided contains links to articles that explain the message content.

Richard MacCutchan 16-Nov-13 6:58am

Some of the links at https://www.google.com/search?q=dns+query+packet should help you.

Sajad Hoseinpoor 16-Nov-13 14:35pm

i searched this in google but not solved

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Sajad Hoseinpoor · Accepted Answer · 2013-11-25T01:28:00

Solved...

I just checked the packet send by wireshark an checked the packed structure.

i made packet useing byte array.

header section almost is static , for the query name made a dynamic byte array.
and Qtype and QClass were static.

so i put whole the arrays in a unit array that containing the bytes which were required.

do like this:

C#

byte [] id={0x11,0x12};
byte [] Flags={0x00,0x00};
byte [] QDcount={0x00,0x01};
byte [] .......

tnx again.