int MDDSocket_Init(void)
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD(2, 2);
err = WSAStartup(wVersionRequested, &wsaData);
if (err != 0) {
LOG_ERROR("MDDSocket, WSAStartup failed with error: %d\n", err);
return MDD_ERROR;
}
if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
LOG_ERROR("MDDSocket, Could not find a usable version of Winsock.dll\n");
WSACleanup();
return MDD_ERROR;
}
sendMsgSocket = socket(AF_INET,SOCK_DGRAM,0);
if (sendMsgSocket == INVALID_SOCKET)
{
LOG_ERROR("MDDSocket,socket function failed when create socket for sendMsg with error = %d\n", WSAGetLastError() );
return MDD_ERROR;
}
if (NULL == (fpWSASendMsg = GetWSASendMsgFunctionPointer(sendMsgSocket)))
{
LOG_ERROR("GetWSASendMsgFunctionPointer returns null pointer.\n");
return MDD_ERROR;
}
recvMsgSocket = socket(AF_INET,SOCK_DGRAM,0);
if (recvMsgSocket == INVALID_SOCKET)
{
LOG_ERROR("MDDSocket,socket function failed when create socket for recvMsg with error = %d\n", WSAGetLastError() );
return MDD_ERROR;
}
if (NULL == (fpWSARecvMsg = GetWSARecvMsgFunctionPointer(recvMsgSocket)))
{
LOG_ERROR("GetWSARecvMsgFunctionPointer returns null pointer.\n");
return MDD_ERROR;
}
return MDD_OK;
}
int __cdecl main()
{
WSADATA wsd;
INT i = 0,
nErr = 0,
nStartup = 0,
rc = 0;
SOCKET sock = INVALID_SOCKET;
SOCKADDR_STORAGE addr = {0},
mcaddr = {0},
remoteaddr = {0};
WSAOVERLAPPED over = {0};
WSABUF wsabuf = {0};
DWORD dwBytes = 0,
dwFlags = 0,
dwRet = 0;
IPV6_MREQ mreq = {0};
WSAMSG wsamsg = {0};
LPFN_WSARECVMSG WSARecvMsg = NULL;
__try
{
//Initialize Winsock
nErr = WSAStartup(WS_VER,&wsd);
if (nErr)
{
WSASetLastError(nErr);
ERR("WSAStartup");
__leave;
}
else
nStartup++;
// bind socket and register multicast
mcaddr.ss_family = AF_INET6;
InitMcastAddr((SOCKADDR*)&mcaddr,sizeof mcaddr);
if (INVALID_SOCKET == (sock = socket(AF_INET6,SOCK_DGRAM,0)))
{
ERR("socket");
__leave;
}
if(!RouteLookup((SOCKADDR*)&mcaddr,
sizeof mcaddr,
(SOCKADDR*)&addr,
sizeof addr
))
{
ERR("RouteLookup");
__leave;
}
SET_PORT((SOCKADDR*)&addr,DEFAULT_PORT);
if (SOCKET_ERROR == bind(sock,(SOCKADDR*)&addr,sizeof addr))
{
ERR("bind");
__leave;
}
mreq.ipv6mr_multiaddr = ((SOCKADDR_IN6*)&mcaddr)->sin6_addr;
if (SOCKET_ERROR == setsockopt(sock,
IPPROTO_IPV6,
IPV6_ADD_MEMBERSHIP,
(char*)&mreq,
sizeof mreq
))
{
ERR("setsockopt IPV6_ADD_MEMBRESHIP");
__leave;
}
// PktInfo
if (!SetIpv6PktInfoOption(sock))
{
ERR("SetIpv6PktInfoOption");
__leave;
}
if(!AllocAndInitIpv6PktInfo(&wsamsg))
{
ERR("AllocAndInitIpv6PktInfo");
__leave;
}
// data buffer
wsabuf.buf = (CHAR*)MALLOC(100);
if(NULL == wsabuf.buf)
{
ERR("HeapAlloc");
__leave;
}
wsabuf.len = (ULONG)MSIZE(wsabuf.buf);
wsamsg.lpBuffers = &wsabuf;
wsamsg.dwBufferCount = 1;
// packet source address
wsamsg.name = (SOCKADDR*)&remoteaddr;
wsamsg.namelen = sizeof remoteaddr;
//Post overlapped WSARecvMsg
InitOverlap(&over);
if (NULL == (WSARecvMsg = GetWSARecvMsgFunctionPointer()))
{
ERR("GetWSARecvMsgFunctionPointer");
__leave;
}
if (SOCKET_ERROR == WSARecvMsg(sock,
&wsamsg,
&dwBytes,
&over,
NULL
))
{
if (WSA_IO_PENDING != WSAGetLastError())
{
ERR("WSARecvMsg");
__leave;
}
}
//set send interface
if (SOCKET_ERROR == SetSendInterface(sock,(SOCKADDR*)&addr))
{
ERR("SetSendInterface");
__leave;
}
//send msg to multicast
SET_PORT((SOCKADDR*)&mcaddr,DEFAULT_PORT);
//send a few packets
for (i=0; i<5; i++)
{
if (SOCKET_ERROR == (rc = sendto(sock,
TST_MSG,
lstrlenA(TST_MSG),
0,
(SOCKADDR*)&mcaddr,
sizeof (mcaddr)
)))
{
ERR("sendto");
__leave;
}
printf("Sent %d bytes\n",rc);
}
dwRet = WaitForSingleObject(over.hEvent,DEFAULT_WAIT);
if (dwRet)
{
printf("%s\n",gai_strerror(dwRet));
__leave;
}
if (!WSAGetOverlappedResult(sock,
&over,
&dwBytes,
TRUE,
&dwFlags
))
{
ERR("WSAGetOverlappedResult");
__leave;
}
printf("WSARecvMsg completed with %d bytes\n",dwBytes);
// if multicast packet do further processing
if (MSG_MCAST & wsamsg.dwFlags)
{
if (ProcessIpv6Msg(&wsamsg))
{
//do something more interesting here
printf("Recvd multicast msg.\n");
}
}
}
__finally
{
CLOSESOCK(sock);
FREE(wsabuf.buf);
FREE(wsamsg.Control.buf);
CLOSESOCKEVENT(over.hEvent);
if(nStartup) WSACleanup();
}
return 0;
}