多网卡组播发送的问题，高手指点?

buffaloox 2011-09-29 11:10:15

我的电脑上装了两个网卡。一个有线网卡，一个无线网卡。
现在想实现，选择指定网发送组播数据。
我实现的方法是：组播绑定的的时候，指定网卡的Ip，加入组播是也是指定网卡ip的。
问题出现了：选择有线网卡的ip时，能够发送组播数据，也是收到组播数据。指定无线网卡的ip时，组播数据发送不了。

另外我的测试，禁用有线网卡，绑定和加入组播时都用INADDR_ANY。能够发送也能接收。

下面是部分代码



BOOL XXXX::Open(PIP_ADAPTER_INFO pAdapter)

{

	int		iRet;

	m_nSocket = socket(AF_INET, SOCK_DGRAM, 0);

	if (m_nSocket == INVALID_SOCKET)

	{

		return FALSE;

	}



	const int routenum = 255;//10;

	iRet = setsockopt(m_nSocket, IPPROTO_IP, IP_MULTICAST_TTL, (char*)&routenum, sizeof(routenum));

	if (iRet == SOCKET_ERROR)

	{

		closesocket(m_nSocket);

		return FALSE;

	}



	const int loopback = 1; //1/0:允许/不允许回馈

	iRet = setsockopt(m_nSocket, IPPROTO_IP, IP_MULTICAST_LOOP, (char*)&loopback, sizeof(loopback));

	if (iRet == SOCKET_ERROR)

	{

		closesocket(m_nSocket);

		return FALSE;

	}



	SOCKADDR_IN saUdpCli;

	memset((char *)&saUdpCli, 0, sizeof(saUdpCli));  

	

	m_bFind = FindIp(pAdapter, m_strIp);

	saUdpCli.sin_family = AF_INET;

	if (m_bFind)

	{

		saUdpCli.sin_addr.s_addr = inet_addr(m_strIp);

	}

	else

	{

		saUdpCli.sin_addr.s_addr = htonl(INADDR_ANY);

	}





	saUdpCli.sin_port = htons(BROADCAST_RECV_PORT);

	iRet = bind(m_nSocket, (SOCKADDR *)&saUdpCli, sizeof(SOCKADDR_IN));

	if (SOCKET_ERROR == iRet)

	{

		::MessageBox(NULL, "bind failure", "SearchDVS", MB_OK);

		closesocket(m_nSocket);

		return FALSE;

	}



	ip_mreq mreq;

	memset(&mreq, 0, sizeof(mreq));

	if (m_bFind)

	{

		mreq.imr_interface.S_un.S_addr = inet_addr(m_strIp);//htonl(INADDR_ANY);

	}

	else

	{

		mreq.imr_interface.S_un.S_addr = htonl(INADDR_ANY);

	}

	mreq.imr_multiaddr.S_un.S_addr = inet_addr("224.0.1.10");



	//加入一个多播组

	iRet = setsockopt(m_nSocket, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char*)&mreq, sizeof(mreq));

	if (iRet == SOCKET_ERROR)

	{

		::MessageBox(NULL, "add multicast(224.0.1.10) failure", "SearchDVS", MB_OK);

		closesocket(m_nSocket);

		return FALSE;

	}



	return TRUE;

}





BOOL XXXX::Send()

{

	CPacket		packet;

	const char	*pszBuffer;

	int			iBufferSize;

	SOCKADDR_IN servAddr;

	

	pszBuffer = packet.Packet(PARAM_REQUEST, 0, NULL, 0, iBufferSize);

	

	memset(&servAddr, 0, sizeof(SOCKADDR_IN));

	servAddr.sin_family      = AF_INET;

	servAddr.sin_addr.s_addr = inet_addr("224.0.1.10");

	servAddr.sin_port        = htons(BROADCAST_SEND_PORT);



	if (m_bFind)

	{

		unsigned long addr = inet_addr(m_strIp);

		setsockopt(m_nSocket, IPPROTO_IP, IP_MULTICAST_IF, (char *)&addr, sizeof(addr));

	}

	int iLen = sendto(m_nSocket, pszBuffer, iBufferSize, 0, (sockaddr *)&servAddr, sizeof(SOCKADDR_IN));

	return TRUE;

}