raw socket接收不到数据

2012-07-11 02:56:00 255 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

IP层实现4－raw socket 接收数据在接收数据时，在ip_local_deliver_finish函数中会先调用阅读详情

初学网络编程，照网上的例子写了个sniffer程序，可是执行到recv的时候，就没有返回了，估计是超时。请高人指点：



#include "StdAfx.h"

#include "Sniffer.h"



#define   SIO_RCVALL   _WSAIOW(IOC_VENDOR,1)

#define BUFFER_SIZE 65535

char RecvBuf[BUFFER_SIZE];



UINT SniffThreadFun(LPVOID pParam);

void SignalHandler(int sig);



Sniffer::Sniffer(void)

	: stopSniff(true)

{

}



Sniffer::~Sniffer(void)

{

}



bool Sniffer::InitSocket(void)

{

	int err;

	int sockOpt = 1;

	char localName[100];

	struct hostent *hostPtr;

	SOCKADDR_IN sockAddr;



	WORD versionRequired = MAKEWORD(1,1);

	err = WSAStartup(versionRequired, &wsaData);

	if(err == SOCKET_ERROR)

		return false;

	sockRaw = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);

	if (sockRaw == INVALID_SOCKET)

		return false;

	err = setsockopt(sockRaw, IPPROTO_IP, IP_HDRINCL, 

		(char*)&sockOpt, sizeof(sockOpt));



	if (err == SOCKET_ERROR)

		return false;

	err = gethostname(localName, sizeof(localName)-1);

	if (err == SOCKET_ERROR)

		return false;

	hostPtr = gethostbyname(localName);

	if (hostPtr == NULL)

		return false;

	sockAddr.sin_addr = *(in_addr *)hostPtr->h_addr_list[0];

	sockAddr.sin_family = AF_INET;

	sockAddr.sin_port = htons(57274);

	err = bind(sockRaw, (PSOCKADDR)&sockAddr, sizeof(sockAddr));

	if (err == SOCKET_ERROR)

		return false;

	return true;

}



bool Sniffer::StartSniff(void)

{

	stopSniff = false;

	int err;

	unsigned long arg = 1;



	err = ioctlsocket(sockRaw, SIO_RCVALL, &arg);

	if (err == SOCKET_ERROR)

		int errCode = WSAGetLastError();

		return false;



	AfxBeginThread(

		(AFX_THREADPROC)SniffThreadFun, 

		(LPVOID)this, 

		THREAD_PRIORITY_NORMAL, 

		0, 0, NULL);



	return true;

}



bool Sniffer::StopSniff(void)

{

	stopSniff = true;

	Sleep(2000);

	int err;

	DWORD arg = 0;

	err = ioctlsocket(sockRaw, SIO_RCVALL, &arg);

	if (err = SOCKET_ERROR)

		return false;



	return true;

}



void Sniffer::DisposeSocket(void)

{

	WSACleanup();

	closesocket(sockRaw);

}



UINT SniffThreadFun(LPVOID pParam)

{

	Sniffer *snifferPtr = (Sniffer *)pParam;



	while(!snifferPtr->stopSniff)

	{

                //执行recv的时候没有返回

		if (recv(snifferPtr->sockRaw, RecvBuf, BUFFER_SIZE, 0))

		{

			snifferPtr->recvCallback(snifferPtr->pObserver, RecvBuf);

		}

	}



	return 0;

}

...全文

LWIP(二)——LWIP有3种编程接口，RAW、NETCONN和SOCKET LWIP有3种编程接口，和。它们的易用性从左到右依次提高，而执行效率从左到右依次降低，用户可以根据实际情况，平衡利弊，选择合适的 API 进行网络应用程序的开发。阅读详情

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raw socket接收不到数据

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