Question

quick ports scanners

Asked by: kar10s

Hi,
I would like to study the C code of a quick console port scanner for windows.
This scanner must check if several ports are opened in a range of machines.
Would be neccesary to use non-blocking sockets and checks if boxes are running without pinging them.

i.e:

scan 172.16.0.1 172.16.1.255 21 23 80

scan ip range from 172.16.0.1 to 172.16.1.255 checking if ports 21,23 and 80 are oppened


Thx
Kar10s

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Asked On
2004-02-02 at 12:33:53ID20870806
Tags

socket

Topics

C Programming Language

,

CYGWIN

Participating Experts
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Answers

 

by: KdoPosted on 2004-02-02 at 12:41:39ID: 10255577

Hi kar10s,


In general, I'm unwilling to post replies that could be used to build nuisance tools.

But if you're looking to test your own network/systems, go to www.nessus.org and check out their port scanning tool.


Good Luck,
Kent

 

by: sunnycoderPosted on 2004-02-02 at 20:08:29ID: 10258333

 

by: akshayxxPosted on 2004-02-03 at 06:05:30ID: 10261030

port scanning .. i would suggest .. nmap.. look for this one on www.insecure.org....
nessus is also great  stuff.. i suggested this just as an alternative to nessus.. and it supports console and gui based interfaces.. both..
and very easy to use...

hope this is of some help
akshay

 

by: kar10sPosted on 2004-02-03 at 12:45:23ID: 10264912

Hi ,
First of all, sorry for my poor english. It is difficult for me to explain in english.

Kdo,
There are a lot of quick ports scanners with the functionality that I am requesting , so If I should need it, I would have downloaded.
Nessus is remote security scanner, and I am looking for "the code of a port Scanner".

akshayxx,sunnycoder,Kdo
I am looking for the code of a C scanner (no C++) for  use with console interface with the characteristic explained on question, because I am studying winsock programming under C , and I am interested in seeing like resolving several problems that I have

for example:  how is made the call to connect() function. I suppose that it is necessary to use select() function due to if a box is not conected to network, the program stop during a lot of time until time out it reached.

I am trying to find a "clean C code" (I suppose that must be Multi thread) without use of "steath techniques" nor any other things. I am looking for a code easy to understand due to I am a begginer on winsock programming.

I regret again my bad englsih.

Best Regards
kar10s

 

 

by: akshayxxPosted on 2004-02-03 at 20:19:35ID: 10268164

both of them are open source and u can download the source codes from the respective websites..
is that what u want ..
"clean C code".. both of them will be not so clean to be understood easily..
if u just want to get hang of network programming .. then probably these are not the best things to start with .. u better take some books ( unix network programming by "richard stevens").. or for windows stuff .. it shud be all there in MSDN examples..

sunny: i didnt intend to duplicate the comment.. but somehow .. when i was posting .. i couldnt see ur comment..

 

by: sunnycoderPosted on 2004-02-03 at 20:57:16ID: 10268346

kar10s,

It seems that you are looking for a neat C code port scanner ... Well none of the popular ones will be that kind ... port scanners need to be efficient and not neat :o)

again as akshay said, port scanner is NOT the kind of thing you should be looking into if you are still trying to learn the system calls ...

There are number of good tutorials out there, I am posting links to some of them ... go through them carefully and you should be able to grasp socket programming better ...
http://www.district86.k12.il.us/central/activities/computerclub/Tutorials/Winsock/Index.htm
http://www.hal-pc.org/~johnnie2/winsock.html

Here is link to another tutorial ... It uses linux socket programming for examples, but basic calls are the same at both (socket,connect, bind etc) ... It descibes them very very well ... take time to go through it
http://www.ecst.csuchico.edu/~beej/guide/net/html/

 

by: kar10sPosted on 2004-02-04 at 07:53:18ID: 10271888

Thanks for your help and your time, but this is not the information that I need.
When I say that I am a beginner, I do not want to say an "absolute begginer" . I have review ed all information that I have found but generally this one is very simple one ( it is not used non-blocking socket, nor multhi-thread, elementary client-server applications). Other are so much complicated and generally they are programmed ussing C++. I want to learn now the basic of multhithread and non-blocking winsock programing, and a scanner is a good example of this type of applications.

I have found some multhi thread scanners in C ( not C++ ) , but they can not scan several IPs, and I am very interested in seeing how is made the call to connect function in this circunstances and any other things.

So it is important for me in order to solve my doubts, to find a C code of these characteristics.
Regards
kar10s

 

by: sunnycoderPosted on 2004-02-05 at 03:01:04ID: 10279425

 

by: kar10sPosted on 2004-02-13 at 13:43:06ID: 10356481

Sorry, but this is not what I need

Best Regards
Kar10s

 

by: kar10sPosted on 2004-03-09 at 17:48:30ID: 10556907

I am agree

Regards
Kar10s

 

by: Computer101Posted on 2004-03-13 at 08:08:32ID: 10588127

PAQed, with points refunded (500)

Computer101
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