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Network Sniffer

, 19 Jul 2004 CPOL
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Network Sniffer

Sample Image - Sniffer.jpg

Introduction

A "Packet Sniffer" is a utility that sniffs without modifying the network's packets in any way. By comparison, a firewall sees all of a computer's packet traffic as well, but it has the ability to block and drop any packets that its programming dictates. Packet sniffers merely watch, display, and log this traffic.

One disturbingly powerful aspect of packet sniffers is their ability to place the hosting machine's network adapter into "promiscuous mode." Network adapters running in promiscuous mode receive not only the data directed to the machine hosting the sniffing software, but also ALL of the traffic on the physically connected local network.

I hope that this piece of code will help you understand the network better.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Eran Aharonovich
Software Developer
Australia Australia
Been a programmer since 1999.
Experience in:
.Net, C++, C#, VB, VB.NET, ASP, ASP.NET, DLLs, COM etc.

Comments and Discussions

 
Questionhelp me how to compile and execute the project.... Pinmemberrahul.csit28-Feb-08 17:36 
QuestionIt works in visual c++ 6.0?? Pinmemberuriel_slp24-Oct-07 10:23 
AnswerRe: It works in visual c++ 6.0?? Pinmemberuriel_slp24-Oct-07 10:27 
QuestionPlease I Need Help Pinmembermustafa_kh_200710-Sep-07 4:03 
QuestionWe can catch the TCP packet only? PinmemberMD8414-May-07 21:57 
AnswerRe: We can catch the TCP packet only? PinmemberEran Aharonovich14-May-07 22:03 
GeneralRe: We can catch the TCP packet only? Pinmemberpriyanka,oberoi110-Aug-09 1:37 
Generalgetting IP address PinmemberAYcoder7-Aug-06 9:08 
Hi,
 
I'm not using this code but I'm using something similar. I need to get the IP address of where I'm listening from. However, the inet_ntoa command always returns IP address as 0.0.0.0.
 
here are parts of the code... please let me know if I'm doing something wrong. I'm using Visual Studio C++. Is it possible that I might be missing a header file or something? I think it would give an error if that was the case. I have this in my code: #pragma comment(lib, "Ws2_32.lib")
 
Thanks!
 

SOCKADDR_IN recv_addr;
SOCKET sock;
 
WSADATA data;
if (WSAStartup(MAKEWORD(2,2), &data) != 0) return(0);
 
int ret;
sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (!sock)
{
WSACleanup();
return(0);
}
recv_addr.sin_family = AF_INET;
recv_addr.sin_addr.s_addr = INADDR_ANY;
recv_addr.sin_port = htons(APP_PORT);
ret = bind(sock, (SOCKADDR *)&recv_addr, sizeof(SOCKADDR));
if (ret)
{
WSACleanup();
return(false);
}
 
case WM_SOCKETREAD:
{
SOCKADDR from;
char buffer[256];
int len = sizeof(SOCKADDR);
memset(buffer, '\0', 256);
recvfrom(sock, buffer, 256, 0, &from, &len);
SetDlgItemText(hDlg, IDC_MESSAGE, buffer);
char* Recv_IP= ReadIP();

}break;
 
char* ReadIP()
{
int length = sizeof(recv_addr);
getsockname(sock, (SOCKADDR*)&recv_addr, &length);
MessageBox(hDlg, inet_ntoa((in_addr)recv_addr.sin_addr), "IP Address", MB_OK);
return(inet_ntoa((in_addr)recv_addr.sin_addr));
}
 

QuestionOutbound traffic is not catched PinmemberJohn Ashraf24-Jul-06 12:22 
Generalrunning the network sniffer Pinmemberujal13-Jul-06 7:18 
GeneralRe: running the network sniffer PinmemberEran Aharonovich13-Jul-06 7:27 
GeneralRe: running the network sniffer Pinmemberujal14-Jul-06 5:33 
Generaldisplay number of packets PinmemberdReAmWoNderS5-Jul-06 4:48 
QuestionMore fragments problem PinmemberWouter Dhondt18-Jun-06 5:06 
GeneralXP SP2 Problem Pinmemberjopus22-Jul-05 11:31 
GeneralI Get Inbound traffic only Pinmemberjopus28-Apr-05 20:23 
GeneralPlease help me! PinmemberdSolariuM29-Mar-05 4:45 
GeneralRe: Please help me! PinmemberEran Aharonovich30-Mar-05 6:32 
QuestionAnd the environment is? Pinmemberabica1-Mar-05 4:42 
AnswerRe: And the environment is? PinmemberEran Aharonovich25-Jul-05 1:07 
QuestionHow top begin writing a packet sniffer? Pinmembergrace4raghu227-Dec-04 4:42 
GeneralFeeto Pinsussfeeto27-Dec-04 3:46 
GeneralRe: Feeto PinsussAnonymous27-Dec-04 4:45 
GeneralHi PinmemberSanjit Rath1-Nov-04 4:21 
GeneralRe: Hi PinmemberEran Aharonovich25-Jul-05 1:22 

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