ndr_stubless.c

这是一个开放源代码的与WINNT/WIN2K/WIN2003兼容的操作系统

    else
    {
        NdrFreeBuffer(&stubMsg);
        client_free_handle(&stubMsg, pProcHeader, pHandleFormat, hBinding);
    }

    TRACE("RetVal = 0x%lx\n", RetVal);

    return RetVal;
}

/* calls a function with the specificed arguments, restoring the stack
 * properly afterwards as we don't know the calling convention of the
 * function */
#if defined __i386__ && defined _MSC_VER
__declspec(naked) LONG_PTR __cdecl call_server_func(SERVER_ROUTINE func, unsigned char * args, unsigned int stack_size)
{
    __asm
    {
        push ebp
        push edi            ; Save registers
        push esi
        mov ebp, esp
        mov eax, [ebp+16]   ; Get stack size
        sub esp, eax        ; Make room in stack for arguments
        mov edi, esp
        mov ecx, eax
        mov esi, [ebp+12]
        shr ecx, 2
        cld
        rep movsd           ; Copy dword blocks
        call [ebp+8]        ; Call function
        lea esp, [ebp-8]    ; Restore stack
        pop esi             ; Restore registers
        pop edi
        pop ebp
        ret
    }
}
#elif defined __i386__ && defined __GNUC__
LONG_PTR __cdecl call_server_func(SERVER_ROUTINE func, unsigned char * args, unsigned int stack_size);
__ASM_GLOBAL_FUNC(call_server_func,
    "pushl %ebp\n\t"
    "movl %esp, %ebp\n\t"
    "pushl %edi\n\t"            /* Save registers */
    "pushl %esi\n\t"
    "movl 16(%ebp), %eax\n\t"   /* Get stack size */
    "subl %eax, %esp\n\t"       /* Make room in stack for arguments */
    "andl $~15, %esp\n\t"	/* Make sure stack has 16-byte alignment for Mac OS X */
    "movl %esp, %edi\n\t"
    "movl %eax, %ecx\n\t"
    "movl 12(%ebp), %esi\n\t"
    "shrl $2, %ecx\n\t"         /* divide by 4 */
    "cld\n\t"
    "rep; movsl\n\t"            /* Copy dword blocks */
    "call *8(%ebp)\n\t"         /* Call function */
    "leal -8(%ebp), %esp\n\t"   /* Restore stack */
    "popl %esi\n\t"             /* Restore registers */
    "popl %edi\n\t"
    "popl %ebp\n\t"
    "ret\n" )
#else
#warning call_server_func not implemented for your architecture
LONG_PTR __cdecl call_server_func(SERVER_ROUTINE func, unsigned char * args, unsigned short stack_size)
{
    FIXME("Not implemented for your architecture\n");
    return 0;
}
#endif

static DWORD calc_arg_size(MIDL_STUB_MESSAGE *pStubMsg, PFORMAT_STRING pFormat)
{
    DWORD size;
    switch(*pFormat)
    {
    case RPC_FC_STRUCT:
        size = *(const WORD*)(pFormat + 2);
        break;
    case RPC_FC_CARRAY:
        size = *(const WORD*)(pFormat + 2);
        ComputeConformance(pStubMsg, NULL, pFormat + 4, 0);
        size *= pStubMsg->MaxCount;
        break;
    case RPC_FC_SMFARRAY:
        size = *(const WORD*)(pFormat + 2);
        break;
    case RPC_FC_LGFARRAY:
        size = *(const DWORD*)(pFormat + 2);
        break;
    default:
        FIXME("Unhandled type %02x\n", *pFormat);
        /* fallthrough */
    case RPC_FC_RP:
        size = sizeof(void *);
        break;
    }
    return size;
}

/* FIXME: need to free some stuff in here too */
LONG WINAPI NdrStubCall2(
    struct IRpcStubBuffer * pThis,
    struct IRpcChannelBuffer * pChannel,
    PRPC_MESSAGE pRpcMsg,
    DWORD * pdwStubPhase)
{
    const MIDL_SERVER_INFO *pServerInfo;
    const MIDL_STUB_DESC *pStubDesc;
    PFORMAT_STRING pFormat;
    MIDL_STUB_MESSAGE stubMsg;
    /* pointer to start of stack to pass into stub implementation */
    unsigned char * args;
    /* size of stack */
    unsigned short stack_size;
    /* current stack offset */
    unsigned short current_stack_offset;
    /* number of parameters. optional for client to give it to us */
    unsigned char number_of_params = ~0;
    /* counter */
    unsigned short i;
    /* cache of Oif_flags from v2 procedure header */
    INTERPRETER_OPT_FLAGS Oif_flags = { 0 };
    /* cache of extension flags from NDR_PROC_HEADER_EXTS */
    INTERPRETER_OPT_FLAGS2 ext_flags = { 0 };
    /* the type of pass we are currently doing */
    int phase;
    /* header for procedure string */
    const NDR_PROC_HEADER *pProcHeader;
    /* offset in format string for start of params */
    int parameter_start_offset;
    /* current format string offset */
    int current_offset;
    /* -Oif or -Oicf generated format */
    BOOL bV2Format = FALSE;
    /* location to put retval into */
    LONG_PTR *retval_ptr = NULL;

    TRACE("pThis %p, pChannel %p, pRpcMsg %p, pdwStubPhase %p\n", pThis, pChannel, pRpcMsg, pdwStubPhase);

    if (pThis)
        pServerInfo = CStdStubBuffer_GetServerInfo(pThis);
    else
        pServerInfo = ((RPC_SERVER_INTERFACE *)pRpcMsg->RpcInterfaceInformation)->InterpreterInfo;

    pStubDesc = pServerInfo->pStubDesc;
    pFormat = pServerInfo->ProcString + pServerInfo->FmtStringOffset[pRpcMsg->ProcNum];
    pProcHeader = (const NDR_PROC_HEADER *)&pFormat[0];

    /* Later NDR language versions probably won't be backwards compatible */
    if (pStubDesc->Version > 0x50002)
    {
        FIXME("Incompatible stub description version: 0x%x\n", pStubDesc->Version);
        RpcRaiseException(RPC_X_WRONG_STUB_VERSION);
    }

    /* create the full pointer translation tables, if requested */
    if (pProcHeader->Oi_flags & RPC_FC_PROC_OIF_FULLPTR)
        stubMsg.FullPtrXlatTables = NdrFullPointerXlatInit(0,XLAT_SERVER);

    if (pProcHeader->Oi_flags & RPC_FC_PROC_OIF_RPCFLAGS)
    {
        const NDR_PROC_HEADER_RPC *pProcHeader = (const NDR_PROC_HEADER_RPC *)&pFormat[0];
        stack_size = pProcHeader->stack_size;
        current_offset = sizeof(NDR_PROC_HEADER_RPC);

    }
    else
    {
        stack_size = pProcHeader->stack_size;
        current_offset = sizeof(NDR_PROC_HEADER);
    }

    TRACE("Oi_flags = 0x%02x\n", pProcHeader->Oi_flags);

    /* binding */
    switch (pProcHeader->handle_type)
    {
    /* explicit binding: parse additional section */
    case RPC_FC_BIND_EXPLICIT:
        switch (pFormat[current_offset]) /* handle_type */
        {
        case RPC_FC_BIND_PRIMITIVE: /* explicit primitive */
            current_offset += sizeof(NDR_EHD_PRIMITIVE);
            break;
        case RPC_FC_BIND_GENERIC: /* explicit generic */
            current_offset += sizeof(NDR_EHD_GENERIC);
            break;
        case RPC_FC_BIND_CONTEXT: /* explicit context */
            current_offset += sizeof(NDR_EHD_CONTEXT);
            break;
        default:
            ERR("bad explicit binding handle type (0x%02x)\n", pProcHeader->handle_type);
            RpcRaiseException(RPC_X_BAD_STUB_DATA);
        }
        break;
    case RPC_FC_BIND_GENERIC: /* implicit generic */
    case RPC_FC_BIND_PRIMITIVE: /* implicit primitive */
    case RPC_FC_CALLBACK_HANDLE: /* implicit callback */
    case RPC_FC_AUTO_HANDLE: /* implicit auto handle */
        break;
    default:
        ERR("bad implicit binding handle type (0x%02x)\n", pProcHeader->handle_type);
        RpcRaiseException(RPC_X_BAD_STUB_DATA);
    }

    bV2Format = (pStubDesc->Version >= 0x20000);

    if (bV2Format)
    {
        const NDR_PROC_PARTIAL_OIF_HEADER *pOIFHeader =
            (const NDR_PROC_PARTIAL_OIF_HEADER *)&pFormat[current_offset];

        Oif_flags = pOIFHeader->Oi2Flags;
        number_of_params = pOIFHeader->number_of_params;

        current_offset += sizeof(NDR_PROC_PARTIAL_OIF_HEADER);
    }

    TRACE("Oif_flags = "); dump_INTERPRETER_OPT_FLAGS(Oif_flags);

    if (Oif_flags.HasExtensions)
    {
        const NDR_PROC_HEADER_EXTS *pExtensions =
            (const NDR_PROC_HEADER_EXTS *)&pFormat[current_offset];
        ext_flags = pExtensions->Flags2;
        current_offset += pExtensions->Size;
    }

    if (pProcHeader->Oi_flags & RPC_FC_PROC_OIF_OBJECT)
        NdrStubInitialize(pRpcMsg, &stubMsg, pStubDesc, pChannel);
    else
        NdrServerInitializeNew(pRpcMsg, &stubMsg, pStubDesc);

    /* store the RPC flags away */
    if (pProcHeader->Oi_flags & RPC_FC_PROC_OIF_RPCFLAGS)
        pRpcMsg->RpcFlags = ((const NDR_PROC_HEADER_RPC *)pProcHeader)->rpc_flags;

    /* use alternate memory allocation routines */
    if (pProcHeader->Oi_flags & RPC_FC_PROC_OIF_RPCSSALLOC)
#if 0
          NdrRpcSsEnableAllocate(&stubMsg);
#else
          FIXME("Set RPCSS memory allocation routines\n");
#endif

    if (Oif_flags.HasPipes)
    {
        FIXME("pipes not supported yet\n");
        RpcRaiseException(RPC_X_WRONG_STUB_VERSION); /* FIXME: remove when implemented */
        /* init pipes package */
        /* NdrPipesInitialize(...) */
    }
    if (ext_flags.HasNewCorrDesc)
    {
        /* initialize extra correlation package */
        FIXME("new correlation description not implemented\n");
        stubMsg.fHasNewCorrDesc = TRUE;
    }

    /* convert strings, floating point values and endianess into our
     * preferred format */
    if ((pRpcMsg->DataRepresentation & 0x0000FFFFUL) != NDR_LOCAL_DATA_REPRESENTATION)
        NdrConvert(&stubMsg, pFormat);

    parameter_start_offset = current_offset;

    TRACE("allocating memory for stack of size %x\n", stack_size);

    args = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, stack_size);
    stubMsg.StackTop = args; /* used by conformance of top-level objects */

    /* add the implicit This pointer as the first arg to the function if we
     * are calling an object method */
    if (pThis)
        *(void **)args = ((CStdStubBuffer *)pThis)->pvServerObject;

    /* order of phases:
     * 1. STUBLESS_UNMARHSAL - unmarshal [in] params from buffer
     * 2. STUBLESS_CALLSERVER - send/receive buffer
     * 3. STUBLESS_CALCSIZE - get [out] buffer size
     * 4. STUBLESS_GETBUFFER - allocate [out] buffer
     * 5. STUBLESS_MARHSAL - marshal [out] params to buffer
     */
    for (phase = STUBLESS_UNMARSHAL; phase <= STUBLESS_FREE; phase++)
    {
        TRACE("phase = %d\n", phase);
        switch (phase)
        {
        case STUBLESS_CALLSERVER:
            /* call the server function */
            if (pServerInfo->ThunkTable && pServerInfo->ThunkTable[pRpcMsg->ProcNum])
                pServerInfo->ThunkTable[pRpcMsg->ProcNum](&stubMsg);
            else
            {
                SERVER_ROUTINE func;
                LONG_PTR retval;

                if (pProcHeader->Oi_flags & RPC_FC_PROC_OIF_OBJECT)
                {
                    SERVER_ROUTINE *vtbl = *(SERVER_ROUTINE **)((CStdStubBuffer *)pThis)->pvServerObject;
                    func = vtbl[pRpcMsg->ProcNum];
                }
                else
                    func = pServerInfo->DispatchTable[pRpcMsg->ProcNum];

                /* FIXME: what happens with return values that don't fit into a single register on x86? */
                retval = call_server_func(func, args, stack_size);

                if (retval_ptr)
                {
                    TRACE("stub implementation returned 0x%lx\n", retval);
                    *retval_ptr = retval;
                }
                else
                    TRACE("void stub implementation\n");
            }

            stubMsg.Buffer = NULL;
            stubMsg.BufferLength = 0;

            break;
        case STUBLESS_GETBUFFER:
            if (pProcHeader->Oi_flags & RPC_FC_PROC_OIF_OBJECT)
                NdrStubGetBuffer(pThis, pChannel, &stubMsg);
            else
            {