udpgram.cpp

这是一个嗅探器

// UDPGram.cpp: implementation of the UDPGram class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "snifferpro.h"
#include "UDPGram.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

UDPGram::UDPGram()
{

}

UDPGram::UDPGram(const unsigned char *buf,const int buflen)
{
	//char *buf=new char[bufferlen];
	//int len=bufferlen;
	unsigned char *pos;
	//memcpy(buf,buffer,bufferlen);
	
	pos=(unsigned char *)buf;
	srcport=(*pos)*0x100+(*(pos+1));

	pos+=2;
	destport=(*pos)*0x100+(*(pos+1));

	pos+=2;
	totallen=(*pos)*0x100+(*(pos+1));

	pos+=2;
	checksum=(*pos)*0x100+(*(pos+1));

	datalen=buflen-8;
	if(datalen>0){
		data=new char[datalen];
		memcpy(data,buf+8,datalen);
	}
	else
		data=NULL;

	//delete[] buf;
}

UDPGram::~UDPGram()
{
	if(data!=NULL)
		delete[] data;
}