marshal.c

这是一个开放源代码的与WINNT/WIN2K/WIN2003兼容的操作系统

        case MSHCTX_LOCAL:
            switch (dest_context)
            {
            case MSHCTX_INPROC:
            case MSHCTX_CROSSCTX:
                break;
            default:
                new_dest_context = dest_context;
            }
            break;
        case MSHCTX_NOSHAREDMEM:
            switch (dest_context)
            {
            case MSHCTX_DIFFERENTMACHINE:
                new_dest_context = dest_context;
                break;
            default:
                break;
            }
            break;
        default:
            break;
        }

        if (old_dest_context == new_dest_context) break;

        old_dest_context = InterlockedCompareExchange((PLONG)&This->dest_context, new_dest_context, old_dest_context);
    } while (new_dest_context != old_dest_context);

    if (dest_context_data)
        InterlockedExchangePointer(&This->dest_context_data, dest_context_data);
}

static HRESULT proxy_manager_query_local_interface(struct proxy_manager * This, REFIID riid, void ** ppv)
{
    HRESULT hr;
    struct ifproxy * ifproxy;

    TRACE("%s\n", debugstr_guid(riid));

    if (IsEqualIID(riid, &IID_IUnknown) ||
        IsEqualIID(riid, &IID_IMultiQI))
    {
        *ppv = (void *)&This->lpVtbl;
        IUnknown_AddRef((IUnknown *)*ppv);
        return S_OK;
    }
    if (IsEqualIID(riid, &IID_IMarshal))
    {
        *ppv = (void *)&This->lpVtblMarshal;
        IUnknown_AddRef((IUnknown *)*ppv);
        return S_OK;
    }
    if (IsEqualIID(riid, &IID_IClientSecurity))
    {
        *ppv = (void *)&This->lpVtblCliSec;
        IUnknown_AddRef((IUnknown *)*ppv);
        return S_OK;
    }

    hr = proxy_manager_find_ifproxy(This, riid, &ifproxy);
    if (hr == S_OK)
    {
        *ppv = ifproxy->iface;
        IUnknown_AddRef((IUnknown *)*ppv);
        return S_OK;
    }

    *ppv = NULL;
    return E_NOINTERFACE;
}

static HRESULT proxy_manager_create_ifproxy(
    struct proxy_manager * This, const STDOBJREF *stdobjref, REFIID riid,
    IRpcChannelBuffer * channel, struct ifproxy ** iif_out)
{
    HRESULT hr;
    IPSFactoryBuffer * psfb;
    struct ifproxy * ifproxy = HeapAlloc(GetProcessHeap(), 0, sizeof(*ifproxy));
    if (!ifproxy) return E_OUTOFMEMORY;

    list_init(&ifproxy->entry);

    ifproxy->parent = This;
    ifproxy->stdobjref = *stdobjref;
    ifproxy->iid = *riid;
    ifproxy->refs = 0;
    ifproxy->proxy = NULL;

    assert(channel);
    ifproxy->chan = channel; /* FIXME: we should take the binding strings and construct the channel in this function */

    /* the IUnknown interface is special because it does not have a
     * proxy associated with the ifproxy as we handle IUnknown ourselves */
    if (IsEqualIID(riid, &IID_IUnknown))
    {
        ifproxy->iface = (void *)&This->lpVtbl;
        IMultiQI_AddRef((IMultiQI *)&This->lpVtbl);
        hr = S_OK;
    }
    else
    {
        hr = get_facbuf_for_iid(riid, &psfb);
        if (hr == S_OK)
        {
            /* important note: the outer unknown is set to the proxy manager.
             * This ensures the COM identity rules are not violated, by having a
             * one-to-one mapping of objects on the proxy side to objects on the
             * stub side, no matter which interface you view the object through */
            hr = IPSFactoryBuffer_CreateProxy(psfb, (IUnknown *)&This->lpVtbl, riid,
                                              &ifproxy->proxy, &ifproxy->iface);
            IPSFactoryBuffer_Release(psfb);
            if (hr != S_OK)
                ERR("Could not create proxy for interface %s, error 0x%08x\n",
                    debugstr_guid(riid), hr);
        }
        else
            ERR("Could not get IPSFactoryBuffer for interface %s, error 0x%08x\n",
                debugstr_guid(riid), hr);

        if (hr == S_OK)
            hr = IRpcProxyBuffer_Connect(ifproxy->proxy, ifproxy->chan);
    }

    if (hr == S_OK)
    {
        EnterCriticalSection(&This->cs);
        list_add_tail(&This->interfaces, &ifproxy->entry);
        LeaveCriticalSection(&This->cs);

        *iif_out = ifproxy;
        TRACE("ifproxy %p created for IPID %s, interface %s with %lu public refs\n",
              ifproxy, debugstr_guid(&stdobjref->ipid), debugstr_guid(riid), stdobjref->cPublicRefs);
    }
    else
        ifproxy_destroy(ifproxy);

    return hr;
}

static HRESULT proxy_manager_find_ifproxy(struct proxy_manager * This, REFIID riid, struct ifproxy ** ifproxy_found)
{
    HRESULT hr = E_NOINTERFACE; /* assume not found */
    struct list * cursor;

    EnterCriticalSection(&This->cs);
    LIST_FOR_EACH(cursor, &This->interfaces)
    {
        struct ifproxy * ifproxy = LIST_ENTRY(cursor, struct ifproxy, entry);
        if (IsEqualIID(riid, &ifproxy->iid))
        {
            *ifproxy_found = ifproxy;
            hr = S_OK;
            break;
        }
    }
    LeaveCriticalSection(&This->cs);

    return hr;
}

static void proxy_manager_disconnect(struct proxy_manager * This)
{
    struct list * cursor;

    TRACE("oxid = %s, oid = %s\n", wine_dbgstr_longlong(This->oxid),
        wine_dbgstr_longlong(This->oid));

    EnterCriticalSection(&This->cs);

    /* SORFP_NOLIFTIMEMGMT proxies (for IRemUnknown) shouldn't be
     * disconnected - it won't do anything anyway, except cause
     * problems for other objects that depend on this proxy always
     * working */
    if (!(This->sorflags & SORFP_NOLIFETIMEMGMT))
    {
        LIST_FOR_EACH(cursor, &This->interfaces)
        {
            struct ifproxy * ifproxy = LIST_ENTRY(cursor, struct ifproxy, entry);
            ifproxy_disconnect(ifproxy);
        }
    }

    /* apartment is being destroyed so don't keep a pointer around to it */
    This->parent = NULL;

    LeaveCriticalSection(&This->cs);
}

static HRESULT proxy_manager_get_remunknown(struct proxy_manager * This, IRemUnknown **remunk)
{
    HRESULT hr = S_OK;
    struct apartment *apt;
    BOOL called_in_original_apt;

    /* we don't want to try and unmarshal or use IRemUnknown if we don't want
     * lifetime management */
    if (This->sorflags & SORFP_NOLIFETIMEMGMT)
        return S_FALSE;

    apt = COM_CurrentApt();
    if (!apt)
        return CO_E_NOTINITIALIZED;

    called_in_original_apt = This->parent && (This->parent->oxid == apt->oxid);

    EnterCriticalSection(&This->cs);
    /* only return the cached object if called from the original apartment.
     * in future, we might want to make the IRemUnknown proxy callable from any
     * apartment to avoid these checks */
    if (This->remunk && called_in_original_apt)
    {
        /* already created - return existing object */
        *remunk = This->remunk;
        IRemUnknown_AddRef(*remunk);
    }
    else if (!This->parent)
        /* disconnected - we can't create IRemUnknown */
        hr = S_FALSE;
    else
    {
        STDOBJREF stdobjref;
        /* Don't want IRemUnknown lifetime management as this is IRemUnknown!
         * We also don't care about whether or not the stub is still alive */
        stdobjref.flags = SORFP_NOLIFETIMEMGMT | SORF_NOPING;
        stdobjref.cPublicRefs = 1;
        /* oxid of destination object */
        stdobjref.oxid = This->oxid;
        /* FIXME: what should be used for the oid? The DCOM draft doesn't say */
        stdobjref.oid = (OID)-1;
        stdobjref.ipid = This->oxid_info.ipidRemUnknown;

        /* do the unmarshal */
        hr = unmarshal_object(&stdobjref, COM_CurrentApt(), This->dest_context,
                              This->dest_context_data, &IID_IRemUnknown,
                              &This->oxid_info, (void**)remunk);
        if (hr == S_OK && called_in_original_apt)
        {
            This->remunk = *remunk;
            IRemUnknown_AddRef(This->remunk);
        }
    }
    LeaveCriticalSection(&This->cs);

    TRACE("got IRemUnknown* pointer %p, hr = 0x%08x\n", *remunk, hr);

    return hr;
}

/* destroys a proxy manager, freeing the memory it used.
 * Note: this function should not be called from a list iteration in the
 * apartment, due to the fact that it removes itself from the apartment and
 * it could add a proxy to IRemUnknown into the apartment. */
static void proxy_manager_destroy(struct proxy_manager * This)
{
    struct list * cursor;

    TRACE("oxid = %s, oid = %s\n", wine_dbgstr_longlong(This->oxid),
        wine_dbgstr_longlong(This->oid));

    if (This->parent)
    {
        EnterCriticalSection(&This->parent->cs);

        /* remove ourself from the list of proxy objects in the apartment */
        LIST_FOR_EACH(cursor, &This->parent->proxies)
        {
            if (cursor == &This->entry)
            {
                list_remove(&This->entry);
                break;
            }
        }

        LeaveCriticalSection(&This->parent->cs);
    }

    /* destroy all of the interface proxies */
    while ((cursor = list_head(&This->interfaces)))
    {
        struct ifproxy * ifproxy = LIST_ENTRY(cursor, struct ifproxy, entry);
        ifproxy_destroy(ifproxy);
    }

    if (This->remunk) IRemUnknown_Release(This->remunk);
    CoTaskMemFree(This->oxid_info.psa);

    DEBUG_CLEAR_CRITSEC_NAME(&This->cs);
    DeleteCriticalSection(&This->cs);

    CloseHandle(This->remoting_mutex);

    HeapFree(GetProcessHeap(), 0, This);
}

/* finds the proxy manager corresponding to a given OXID and OID that has
 * been unmarshaled in the specified apartment. The caller must release the
 * reference to the proxy_manager when the object is no longer used. */
static BOOL find_proxy_manager(APARTMENT * apt, OXID oxid, OID oid, struct proxy_manager ** proxy_found)
{
    BOOL found = FALSE;
    struct list * cursor;

    EnterCriticalSection(&apt->cs);
    LIST_FOR_EACH(cursor, &apt->proxies)
    {
        struct proxy_manager * proxy = LIST_ENTRY(cursor, struct proxy_manager, entry);
        if ((oxid == proxy->oxid) && (oid == proxy->oid))
        {
            *proxy_found = proxy;
            ClientIdentity_AddRef((IMultiQI *)&proxy->lpVtbl);
            found = TRUE;
            break;
        }
    }
    LeaveCriticalSection(&apt->cs);
    return found;
}

HRESULT apartment_disconnectproxies(struct apartment *apt)
{
    struct list * cursor;

    LIST_FOR_EACH(cursor, &apt->proxies)
    {
        struct proxy_manager * proxy = LIST_ENTRY(cursor, struct proxy_manager, entry);
        proxy_manager_disconnect(proxy);
    }

    return S_OK;
}

/********************** StdMarshal implementation ****************************/
typedef struct _StdMarshalImpl
{
    const IMarshalVtbl	*lpvtbl;
    LONG		ref;

    IID			iid;
    DWORD		dwDestContext;
    LPVOID		pvDestContext;
    DWORD		mshlflags;
} StdMarshalImpl;

static HRESULT WINAPI 
StdMarshalImpl_QueryInterface(LPMARSHAL iface, REFIID riid, LPVOID *ppv)
{
    *ppv = NULL;
    if (IsEqualIID(&IID_IUnknown, riid) || IsEqualIID(&IID_IMarshal, riid))
    {
        *ppv = iface;
        IUnknown_AddRef(iface);
        return S_OK;
    }
    FIXME("No interface for %s.\n", debugstr_guid(riid));
    return E_NOINTERFACE;
}

static ULONG WINAPI
StdMarshalImpl_AddRef(LPMARSHAL iface)
{
    StdMarshalImpl *This = (StdMarshalImpl *)iface;
    return InterlockedIncrement(&This->ref);
}

static ULONG WINAPI
StdMarshalImpl_Release(LPMARSHAL iface)
{
    StdMarshalImpl *This = (StdMarshalImpl *)iface;
    ULONG ref = InterlockedDecrement(&This->ref);

    if (!ref) HeapFree(GetProcessHeap(),0,This);
    return ref;
}

static HRESULT WINAPI
StdMarshalImpl_GetUnmarshalClass(
    LPMARSHAL iface, REFIID riid, void* pv, DWORD dwDestContext,
    void* pvDestContext, DWORD mshlflags, CLSID* pCid)
{
    *pCid = CLSID_DfMarshal;
    return S_OK;
}

static HRESULT WINAPI
StdMarshalImpl_GetMarshalSizeMax(
    LPMARSHAL iface, REFIID riid, void* pv, DWORD dwDestContext,