WS2TCPIP_INLINE int getsourcefilter	(	IN SOCKET	Socket,
		IN ULONG	Interface,
		IN CONST SOCKADDR *	Group,
		IN int	GroupLength,
		OUT MULTICAST_MODE_TYPE *	FilterMode,
		IN OUT ULONG *	SourceCount,
		OUT SOCKADDR_STORAGE *	SourceList
	)

Definition at line 706 of file ws2tcpip.h.

{
  int Error;
  DWORD Size, Returned;
  PGROUP_FILTER Filter;

  if (*SourceCount > (((ULONG) (ULONG_MAX - sizeof(*Filter))) / sizeof(*SourceList))) {
    WSASetLastError(WSAENOBUFS);
    return SOCKET_ERROR;
  }

  Size = GROUP_FILTER_SIZE(*SourceCount);
  Filter = (PGROUP_FILTER) HeapAlloc(GetProcessHeap(), 0, Size);
  if (Filter == NULL) {
    WSASetLastError(WSAENOBUFS);
    return SOCKET_ERROR;
  }

  Filter->gf_interface = Interface;
  ZeroMemory(&Filter->gf_group, sizeof(Filter->gf_group));
  CopyMemory(&Filter->gf_group, Group, GroupLength);
  Filter->gf_numsrc = *SourceCount;

  Error = WSAIoctl(Socket, SIOCGMSFILTER, Filter, Size, Filter, Size, &Returned, NULL, NULL);
  if (Error == 0) {
    if (*SourceCount > 0) {
      CopyMemory(SourceList, Filter->gf_slist, *SourceCount * sizeof(*SourceList));
      *SourceCount = Filter->gf_numsrc;
    }
    *FilterMode = Filter->gf_fmode;
  }

  HeapFree(GetProcessHeap(), 0, Filter);

  return Error;
}

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