求一个C＋＋或C编写网络嗅探器的设计思路和代码

来源：百度知道 编辑：UC知道 时间：2024/05/24 17:50:51
RT
1、不限平台。可以使用libpcap、winpcap 或 Linux的原始套接字SOCK_RAW；
2、能够解析出IP层和传输层的协议头；
3、能够输出文本方式传送的数据包的内容；
4、有检查校验和以及简单的合法性检查的功能；
5、选作：用你的sniffer对局域网进行流量审计分析；

Windows下面的
#include <vector>
#include <iostream>
#include <winsock2.h>
#include <mstcpip.h>

#pragma comment( lib, "ws2_32.lib" )

using namespace std;

struct IPHeader
{
unsigned char mHeaderLengthAndVersion;
unsigned char mTypeOfService;
unsigned short mTotalLength;
unsigned short mIdentifier;
unsigned short mFragment;
unsigned char mTTL;
unsigned char mProtocolType;
unsigned short mCheckSum;
unsigned int mSourceIP;
unsigned int mDestIP;

int getHeaderLength() const
{
return mHeaderLengthAndVersion & 0xf;
}
};

struct TCPHeader
{
unsigned short mSourcePort;
unsigned short mDestPort;
unsigned int mSequence;
unsigned int mAck;
unsigned char mLengthAndReserve;
unsigned char mFlags;
unsigned short mWindow;
unsigned short mCheckSum;
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