DNS if u need it

very very good!

it just does what it needs to do, fast and efficient without doing other stuff like the "real CDnsresolver" class does on Codeguru.com

but i have 1 remark:
or its my imagination OR this code is used in Sobig.F + Mimail worms
since they 1) check the current Dns (not implemented here however)
2)query all the mx records

and thats just what your code does, they just needed to implement the files and there ready

:s:s

too bad that viruswriters also visit websites like these :'(

Or maybe its just my imagination, but look on the internet
how many codes do you find doing this?

and how easy is it to code?

thanks for ur code

I want to use ur code to design a tool to test ENUM service.

so , I will add NAPTR(ref to RFC 2915) record to ur source code.

anyway , thanks

nice work
I wonder if you could add more functions in it
especially the one that can do the same thing as gethostbyaddr()/WSAAsyncGetHostByAddr()/getnameinfo()

why I need that ?
1. gethostbyaddr() is not thread-safe
2. getnameinfo() is for win2k/xp only
3. WSAAsyncGetHostByAddr() is not designed for multi-thread use
4. it's easy to add the "Terminate" function in your code. gethostbyaddr() sometimes take many seconds to return the result, and no way to terminate while querying.

therefore, it would be much appreciated if you can add this new function

thank you

OK. this code is thread safe, what do you tell about Terminate function? where do you will user this?
In this code wery easy make terminate fuction, look at line witch WaitForSingleObject() function in query() function and you can make in this anything. Smile | :)

Just what i needed...thanx for sharing your work. nevermind the english... most ppl here speak c++ instead... or they should..

thanks you. but i'm want make this more goodly. but i'm don't know as do it. this code is no 100% good. i'm must read full RFC, but i'm don't understant many words in this Frown | :(

and my code not 100% compatible with RFC ;((

Starting with Windows 2000, the Win32 API supports a function called DNSQuery() which does direct DNS queries for any record type. It even supports IPv6 type records.
Nice alternative if you are not depending on backwards compatibility.

... you keep forgetting that sheep shagging is not a crime in Australia ...Paul Watson, The Lounge

can you use this in win9x suxx? or wince?

I maked such mistake...
It so buggy, no more comments Mad | :mad:

may be this has some mistakes and other things. but you may say about it, and i'm change this bugs. this code is only for education and i'm make for self study only Smile | :)

.

i'm know what this code has many errors..
but there was for testing of DNS quering and this belove that DNS answer has no any errors. If DNS answer is not corrent. this may fail. I have correct code for commercial application, but for beginners and this very good. Sorry for this errors. Smile | :)

works well here! The article maybe a little terse but the code is good!

If people find something doesn't work for them - it helps if you can give a little information as to what the problem is - otherwise such comments are of little use to anyone!

Yeah this code is really wonderful (i normally dont say this, but this is just great!). I guess wukas a newbie. Start reading How to C++ wukas.

Umer Mansoor

Hi,

How can I use this to get a host IP address by its DNS name
just like gethostbyname() does ?

Thanks.

This is simple answer if you cnow as use DNS

I'm update my article and add new Project: dgramm

Run it's programm and look at results. For your answer look at A Record

Thanks for your answer (and the new code, way cool Cool | :cool:

)
However, it doesn't always work: sometimes I get the A Record
in the reply, sometimes I get only NS Records.

Changing the type of request to "typeA" (in dgrammView.cpp line 131)
seems to solve this.

Thank you for a very educational piece of code Smile | :)

As you seem to understand the code is in c++ and is therefore not usable from other languages eg VB.

In order to use the functionality of this class from other languages such as VB you can wrap the c++ class in a DLL.

You'll find this MSDN article quite useful q118643[^] it applies to VB3 but I think the basics still stand. Also the following article explains in more detail on how to do this Calling a C++ DLL from Visual Basic - Introduction[^]

Stupidity dies.
The end of future offspring.
Evolution wins.
- A Darwin Awards Haiku

One of way is COM objects.
I'm can develop easy use COM object, who will warp C++ code.
But I'm ask you - who will use it? If this need - I'm make it! Big Grin | :-D

Yes you can do it in COM, but you asked ( or so I thought ) if anyone knew how to talk to the class in Win32 eg non C++. Sorry for the confusion. Smile | :)

Stupidity dies.
The end of future offspring.
Evolution wins.
- A Darwin Awards Haiku

This article has been getting a poor reading mainly I think due to its poor English... Unfortunately the previous 7 (at the time of this posting) voters haven't commented as to why they gave it a poor rating. However the Authors native langauge isn't English and his English appears to have been picked up from email speak - e.g. u == you etc. Please If you are going to give someone a poor rating at least explain why.

I've looked though the code and it isn't bad, can't see why I'd use it, but it doesn't make it a bad posting.

So I've reworded it to make it more legible.

<start>

Some times you want to receive information from DNS servers using C++.
This simple project shows how you can send and receive messages to and from DNS servers.

There are 2 downloads supplied (see above)
The first download contains the DNS structures and CDnsResolver class that you can use to make queries of your own.
The second download contains a sample project, console application, that shows you how to use the supplied classes.
To use the sample application you use the following command:
UsingDNS dns_server host host host [any number of hosts]
This is useful for resolving Mail servers or you can study it to see how the code works.

For more information read the RFC documentation at DNS.NET [^] which also contains a number of useful tools.

If you know how to return this information under plain Win32 please post a message below.

<end>

Stupidity dies.
The end of future offspring.
Evolution wins.
- A Darwin Awards Haiku

Shaun Wilde wrote:
So I've reworded it to make it more legible.

Thanks, but I don't think that the problem here is the language barrier. It's that the article does't really explain much.

I could "reword" it in one sentence: Here is the code.

<center> /* I C++, therefore I am... */ </center>

George wrote:
I could "reword" it in one sentence: Here is the code.

Smile | :)

- True - but hopefully these comments will make DarkSnOw realise that the article isn't much as it currently stands and that he should improve upon it.

It is hard to write an article on a single class and we (the developer community) should encourage, rather than just criticise, new writers to improve their articles.

So how would you like him to improve this artcle.

Well maybe the adddition of the following sections might help

a section on DNS and why it is there and what it is used for.
a section on why someone might want to query a DNS server ie I may not know I could do something but when reading this article think 'cool' (actually I never think/say cool unless ordering a beer).
a section on what the code does and why it wraps the code in the way it does eg code snippets.
a section on using the class eg extracts from the sample.
a section on 'further reading', links to other sites with DNS info.

The above only need to be a few sentences a piece but they would expand the article.

If he has trouble with the english language then I am sure that he could post in the lounge for someone to give it a read and for additional comments (corrections) etc.

Stupidity dies.
The end of future offspring.
Evolution wins.
- A Darwin Awards Haiku

OK. Thank all for your comments. But my english so very poor and I'm can't write long text's and easy reading articles. But if you help me, I will write comments and articles more easy Big Grin | :-D

.

That's okay - I understand, hence why I mentioned it Smile | :)

.

PS not everyone is infallible I spelt 'information' wrong Smile | :)

.

Stupidity dies.
The end of future offspring.
Evolution wins.
- A Darwin Awards Haiku

DNS if u need it

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