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Network Sniffer

By , 19 Jul 2004
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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)

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

 
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 
MSDN says:
 
BOOL GetIpAddress(char *hostname)
{
WCHAR msg[128];
HOSTENT *lpHost=NULL;
struct sockaddr_in dest;
 
lpHost = gethostbyname(hostname);
if (lpHost == NULL)
{
wsprintf(msg, L"gethostbyname failed: %d", WSAGetLastError());
MessageBox(NULL, msg, NULL, MB_OK);
}
else
{
for(int i=0; lpHost->h_addr_list[i] != NULL ;i++)
{
memcpy(&(dest.sin_addr), lpHost->h_addr_list[i],
lpHost->h_length);
wsprintf(msg, L"IP address is: '%S'",
inet_ntoa(dest.sin_addr));
MessageBox(NULL, msg, L"IP Address", MB_OK);
}
 
}
return 0;
}

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 
GeneralThe article Location Pinmembersergeyv20028-Sep-04 10:26 
GeneralRe: The article Location PinmemberEran Aharonovich30-Mar-05 6:33 
GeneralNice sniffer.. but.. PinmemberMichael Hendrickx21-Aug-04 3:49 
GeneralRe: Nice sniffer.. but.. PinmemberEran Aharonovich21-Aug-04 7:43 
GeneralRe: Nice sniffer.. but.. PinmemberMichael Hendrickx21-Aug-04 20:37 
GeneralRe: Nice sniffer.. but.. PinmemberThatsAlok10-Nov-04 22:51 
GeneralRe: Nice sniffer.. but.. PinmemberEran Aharonovich14-Nov-04 1:21 
GeneralRe: Nice sniffer.. but.. PinmemberThatsAlok14-Nov-04 18:28 
GeneralRe: Nice sniffer.. but.. PinmemberEran Aharonovich14-Nov-04 20:12 
GeneralRe: Nice sniffer.. but.. PinsussMsftone14-Jan-05 14:39 

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