establish a connection using TCP and capture the incoming packets

shraddha · 09-11-2005, 11:47 AM

hello ..

i have to write a program in C++,to establish a TCP connection to internet and then sniff the packets using UDP..study those packets in details..i mean demarcate the packets...

the OS on which i work is windows 98,and i work with Turbo C compiler.

so,how do i start off with such kind of programming??

th

**sean** · 09-11-2005, 11:50 AM

I recommend Beej's Guide to Network Programming

http://www.ecst.csuchico.edu/~beej/guide/net/

I also recommend a newer compiler - like the freely available and hugely popular Dev-C++ from Bloodshed.

nkhambal · 09-11-2005, 12:49 PM

Since you are planning to develop this program on Windows Platform you need to Learn Winsock programming. Also, you definitely need little advanced compiler (and preferebly an advanced OS

). Anyway just check out the link below. It will give you a good heads-up.

Winsock Programmer's FAQ

shraddha · 09-12-2005, 07:41 AM

thank you for links u send me..it really helped.

but for now ,i m looking forward to write a simple code in C or C++ ,just to extract the data
coming in while i m online,as the byte stream...as in i have written a simple C program,using inportb() and outportb(),but it does not work.could u suggest me some better way of doing it,but in C or C++ only

**Salem** · 09-12-2005, 10:51 AM

It's not going to happen with that fossil compiler.

**Salem** · 09-13-2005, 05:51 AM

Is this your dial-up connection to your ISP via a modem on a COM port?

shraddha · 09-13-2005, 06:08 AM

yes!! its a dial up connection

**Salem** · 09-13-2005, 10:58 AM

Well if you're in windows, then I think the only way you'll get to sniff the COM port is by
a) Using some tools
http://www.softpedia.com/get/Network...-Monitor.shtml
http://www.sysinternals.com/Utilities/Portmon.html
b) Writing some win32 hook functions (no I don't know how to do this).

Also, since you're actually trying to interpret an IP link, perhaps ethereal will do it for you as well. Note I don't know this will work since I've only ever used ethereal on proper networks.
http://www.ethereal.com/

None of this stands a chance of working with your crusty old compiler.

bithub · 09-13-2005, 12:51 PM

Quote:

Also, since you're actually trying to interpret an IP link, perhaps ethereal will do it for you as well.

I don't believe ethereal works on dialup or ISDN connections.

shraddha, I think you need to do a better job explaining exactly what it is you are trying to accomplish. I'm still not sure whether you are trying to sniff packets from a connection, or simply create your own connection to some server.

shraddha · 09-14-2005, 08:55 AM

i m just trying to sniff packets from a connection..

Devil Panther · 09-14-2005, 03:21 PM

Quote:

Originally Posted by shraddha

... establish a TCP connection to internet and then sniff the packets using UDP...

please explain what do you mean by sniffing using UDP???

arron · 09-27-2005, 07:48 AM

"establish a TCP connection to internet and then sniff the packets using UDP"

You wan't a TCP session with internet. That's clear
What's the next one ? Sniff the packets using UDP ??
Once u establish a connection (TCP), how will it accept UDP pacets for you to sniff ?

tin · 10-22-2005, 02:15 AM

When you sniff for packets, you get all kinds TCP, UDP, ICMP and others. Perhaps you want to capture the TCP packets that you're sending. You can use ethereal for that if you don't want to write code.

If you do want to write C code for packet capture, take a look at the Pcap library. It makes life a lot easier for network sniffing.

09-11-2005, 11:47 AM	#1
shraddha Registered User Join Date: Sep 2005 Posts: 9	establish a connection using TCP and capture the incoming packets hello .. i have to write a program in C++,to establish a TCP connection to internet and then sniff the packets using UDP..study those packets in details..i mean demarcate the packets... the OS on which i work is windows 98,and i work with Turbo C compiler. so,how do i start off with such kind of programming?? th
shraddha is offline

09-11-2005, 11:50 AM	#2
sean Super Moderator Join Date: Sep 2001 Posts: 4,746	I recommend Beej's Guide to Network Programming http://www.ecst.csuchico.edu/~beej/guide/net/ I also recommend a newer compiler - like the freely available and hugely popular Dev-C++ from Bloodshed.
sean is offline

09-11-2005, 12:49 PM	#3
nkhambal Registered User Join Date: Apr 2005 Posts: 134	Since you are planning to develop this program on Windows Platform you need to Learn Winsock programming. Also, you definitely need little advanced compiler (and preferebly an advanced OS ). Anyway just check out the link below. It will give you a good heads-up. Winsock Programmer's FAQ
nkhambal is offline

09-12-2005, 07:41 AM	#4
shraddha Registered User Join Date: Sep 2005 Posts: 9	thank you for links u send me..it really helped. but for now ,i m looking forward to write a simple code in C or C++ ,just to extract the data coming in while i m online,as the byte stream...as in i have written a simple C program,using inportb() and outportb(),but it does not work.could u suggest me some better way of doing it,but in C or C++ only
shraddha is offline

09-12-2005, 10:51 AM	#5
Salem and the hat of Jobseeking Join Date: Aug 2001 Location: The edge of the known universe Posts: 21,710	It's not going to happen with that fossil compiler. __________________ If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
Salem is offline

09-13-2005, 05:51 AM	#6
Salem and the hat of Jobseeking Join Date: Aug 2001 Location: The edge of the known universe Posts: 21,710	Is this your dial-up connection to your ISP via a modem on a COM port? __________________ If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
Salem is offline

09-13-2005, 06:08 AM	#7
shraddha Registered User Join Date: Sep 2005 Posts: 9	yes!! its a dial up connection
shraddha is offline

09-13-2005, 10:58 AM	#8
Salem and the hat of Jobseeking Join Date: Aug 2001 Location: The edge of the known universe Posts: 21,710	Well if you're in windows, then I think the only way you'll get to sniff the COM port is by a) Using some tools http://www.softpedia.com/get/Network...-Monitor.shtml http://www.sysinternals.com/Utilities/Portmon.html b) Writing some win32 hook functions (no I don't know how to do this). Also, since you're actually trying to interpret an IP link, perhaps ethereal will do it for you as well. Note I don't know this will work since I've only ever used ethereal on proper networks. http://www.ethereal.com/ None of this stands a chance of working with your crusty old compiler. __________________ If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
Salem is offline

09-14-2005, 08:55 AM	#10
shraddha Registered User Join Date: Sep 2005 Posts: 9	i m just trying to sniff packets from a connection..
shraddha is offline

09-27-2005, 07:48 AM	#12
arron Arron Join Date: Jul 2005 Posts: 17	"establish a TCP connection to internet and then sniff the packets using UDP" You wan't a TCP session with internet. That's clear What's the next one ? Sniff the packets using UDP ?? Once u establish a connection (TCP), how will it accept UDP pacets for you to sniff ?
arron is offline

10-22-2005, 02:15 AM	#13
tin Registered User Join Date: Sep 2004 Posts: 12	Sniffing When you sniff for packets, you get all kinds TCP, UDP, ICMP and others. Perhaps you want to capture the TCP packets that you're sending. You can use ethereal for that if you don't want to write code. If you do want to write C code for packet capture, take a look at the Pcap library. It makes life a lot easier for network sniffing.
tin is offline

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