git.oblomov.eu Git - wine/blob - dlls/rpcrt4/cproxy.c

   1 /*
   2  * COM proxy implementation
   3  *
   4  * Copyright 2001 Ove Kåven, TransGaming Technologies
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  * TODO: Handle non-i386 architectures
  21  *       Get rid of #if 0'ed code.
  22  */
  23
  24 #include <stdarg.h>
  25
  26 #include "windef.h"
  27 #include "winbase.h"
  28 #include "winerror.h"
  29
  30 #include "objbase.h"
  31 #include "rpcproxy.h"
  32
  33 #include "cpsf.h"
  34 #include "ndr_misc.h"
  35 #include "wine/debug.h"
  36
  37 WINE_DEFAULT_DEBUG_CHANNEL(ole);
  38
  39 struct StublessThunk;
  40
  41 /* I don't know what MS's std proxy structure looks like,
  42    so this probably doesn't match, but that shouldn't matter */
  43 typedef struct {
  44   ICOM_VTABLE(IRpcProxyBuffer) *lpVtbl;
  45   LPVOID *PVtbl;
  46   DWORD RefCount;
  47   const MIDL_STUBLESS_PROXY_INFO *stubless;
  48   const IID* piid;
  49   LPUNKNOWN pUnkOuter;
  50   PCInterfaceName name;
  51   LPPSFACTORYBUFFER pPSFactory;
  52   LPRPCCHANNELBUFFER pChannel;
  53   struct StublessThunk *thunks;
  54 } StdProxyImpl;
  55
  56 static ICOM_VTABLE(IRpcProxyBuffer) StdProxy_Vtbl;
  57
  58 /* How the Windows stubless proxy thunks work is explained at
  59  * http://msdn.microsoft.com/library/en-us/dnmsj99/html/com0199.asp,
  60  * but I'll use a slightly different method, to make life easier */
  61
  62 #if defined(__i386__)
  63
  64 struct StublessThunk {
  65   BYTE push WINE_PACKED;
  66   DWORD index WINE_PACKED;
  67   BYTE call WINE_PACKED;
  68   LONG handler WINE_PACKED;
  69   BYTE ret WINE_PACKED;
  70   WORD bytes WINE_PACKED;
  71   BYTE pad[3];
  72 };
  73
  74 /* adjust the stack size since we don't use Windows's method */
  75 #define STACK_ADJUST sizeof(DWORD)
  76
  77 #define FILL_STUBLESS(x,idx,stk) \
  78  x->push = 0x68; /* pushl [immediate] */ \
  79  x->index = (idx); \
  80  x->call = 0xe8; /* call [near] */ \
  81  x->handler = (char*)ObjectStubless - (char*)&x->ret; \
  82  x->ret = 0xc2; /* ret [immediate] */ \
  83  x->bytes = stk; \
  84  x->pad[0] = 0x8d; /* leal (%esi),%esi */ \
  85  x->pad[1] = 0x76; \
  86  x->pad[2] = 0x00;
  87
  88 static HRESULT WINAPI ObjectStubless(DWORD index)
  89 {
  90   char *args = (char*)(&index + 2);
  91   LPVOID iface = *(LPVOID*)args;
  92
  93   ICOM_THIS_MULTI(StdProxyImpl,PVtbl,iface);
  94
  95   PFORMAT_STRING fs = This->stubless->ProcFormatString + This->stubless->FormatStringOffset[index];
  96   unsigned bytes = *(WORD*)(fs+8) - STACK_ADJUST;
  97   TRACE("(%p)->(%ld)([%d bytes]) ret=%08lx\n", iface, index, bytes, *(DWORD*)(args+bytes));
  98
  99   return RPCRT4_NdrClientCall2(This->stubless->pStubDesc, fs, args);
 100 }
 101
 102 #else  /* __i386__ */
 103
 104 /* can't do that on this arch */
 105 struct StublessThunk { int dummy; };
 106 #define FILL_STUBLESS(x,idx,stk) \
 107  ERR("stubless proxies are not supported on this architecture\n");
 108 #define STACK_ADJUST 0
 109
 110 #endif  /* __i386__ */
 111
 112 HRESULT WINAPI StdProxy_Construct(REFIID riid,
 113                                  LPUNKNOWN pUnkOuter,
 114                                  PCInterfaceName name,
 115                                  CInterfaceProxyVtbl *vtbl,
 116                                  CInterfaceStubVtbl *svtbl,
 117                                  LPPSFACTORYBUFFER pPSFactory,
 118                                  LPRPCPROXYBUFFER *ppProxy,
 119                                  LPVOID *ppvObj)
 120 {
 121   StdProxyImpl *This;
 122   const MIDL_STUBLESS_PROXY_INFO *stubless = NULL;
 123
 124   TRACE("(%p,%p,%p,%p,%p) %s\n", pUnkOuter, vtbl, pPSFactory, ppProxy, ppvObj, name);
 125
 126   /* I can't find any other way to detect stubless proxies than this hack */
 127   if (!IsEqualGUID(vtbl->header.piid, riid)) {
 128     stubless = *((const void **)vtbl)++;
 129     TRACE("stubless=%p\n", stubless);
 130   }
 131
 132   TRACE("iid=%s\n", debugstr_guid(vtbl->header.piid));
 133   TRACE("vtbl=%p\n", vtbl->Vtbl);
 134
 135   if (!IsEqualGUID(vtbl->header.piid, riid)) {
 136     ERR("IID mismatch during proxy creation\n");
 137     return RPC_E_UNEXPECTED;
 138   }
 139
 140   This = HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,sizeof(StdProxyImpl));
 141   if (!This) return E_OUTOFMEMORY;
 142
 143   if (stubless) {
 144     unsigned i, count = svtbl->header.DispatchTableCount;
 145     /* Maybe the original vtbl is just modified directly to point at
 146      * ObjectStublessClientXXX thunks in real Windows, but I don't like it
 147      */
 148     TRACE("stubless thunks: count=%d\n", count);
 149     This->thunks = HeapAlloc(GetProcessHeap(),0,sizeof(struct StublessThunk)*count);
 150     This->PVtbl = HeapAlloc(GetProcessHeap(),0,sizeof(LPVOID)*count);
 151     for (i=0; i<count; i++) {
 152       struct StublessThunk *thunk = &This->thunks[i];
 153       if (vtbl->Vtbl[i] == (LPVOID)-1) {
 154         PFORMAT_STRING fs = stubless->ProcFormatString + stubless->FormatStringOffset[i];
 155         unsigned bytes = *(WORD*)(fs+8) - STACK_ADJUST;
 156         TRACE("method %d: stacksize=%d\n", i, bytes);
 157         FILL_STUBLESS(thunk, i, bytes)
 158         This->PVtbl[i] = thunk;
 159       }
 160       else {
 161         memset(thunk, 0, sizeof(struct StublessThunk));
 162         This->PVtbl[i] = vtbl->Vtbl[i];
 163       }
 164     }
 165   }
 166   else
 167     This->PVtbl = vtbl->Vtbl;
 168
 169   This->lpVtbl = &StdProxy_Vtbl;
 170   This->RefCount = 1;
 171   This->stubless = stubless;
 172   This->piid = vtbl->header.piid;
 173   This->pUnkOuter = pUnkOuter;
 174   This->name = name;
 175   This->pPSFactory = pPSFactory;
 176   This->pChannel = NULL;
 177   *ppProxy = (LPRPCPROXYBUFFER)&This->lpVtbl;
 178   *ppvObj = &This->PVtbl;
 179   IPSFactoryBuffer_AddRef(pPSFactory);
 180
 181   return S_OK;
 182 }
 183
 184 static void WINAPI StdProxy_Destruct(LPRPCPROXYBUFFER iface)
 185 {
 186   ICOM_THIS_MULTI(StdProxyImpl,lpVtbl,iface);
 187
 188   IPSFactoryBuffer_Release(This->pPSFactory);
 189   if (This->thunks) {
 190     HeapFree(GetProcessHeap(),0,This->PVtbl);
 191     HeapFree(GetProcessHeap(),0,This->thunks);
 192   }
 193   HeapFree(GetProcessHeap(),0,This);
 194 }
 195
 196 static HRESULT WINAPI StdProxy_QueryInterface(LPRPCPROXYBUFFER iface,
 197                                              REFIID riid,
 198                                              LPVOID *obj)
 199 {
 200   ICOM_THIS_MULTI(StdProxyImpl,lpVtbl,iface);
 201   TRACE("(%p)->QueryInterface(%s,%p)\n",This,debugstr_guid(riid),obj);
 202
 203   if (IsEqualGUID(&IID_IUnknown,riid) ||
 204       IsEqualGUID(This->piid,riid)) {
 205     *obj = &This->PVtbl;
 206     This->RefCount++;
 207     return S_OK;
 208   }
 209
 210   if (IsEqualGUID(&IID_IRpcProxyBuffer,riid)) {
 211     *obj = &This->lpVtbl;
 212     This->RefCount++;
 213     return S_OK;
 214   }
 215
 216   return E_NOINTERFACE;
 217 }
 218
 219 static ULONG WINAPI StdProxy_AddRef(LPRPCPROXYBUFFER iface)
 220 {
 221   ICOM_THIS_MULTI(StdProxyImpl,lpVtbl,iface);
 222   TRACE("(%p)->AddRef()\n",This);
 223
 224   return ++(This->RefCount);
 225 }
 226
 227 static ULONG WINAPI StdProxy_Release(LPRPCPROXYBUFFER iface)
 228 {
 229   ICOM_THIS_MULTI(StdProxyImpl,lpVtbl,iface);
 230   TRACE("(%p)->Release()\n",This);
 231
 232   if (!--(This->RefCount)) {
 233     StdProxy_Destruct((LPRPCPROXYBUFFER)&This->lpVtbl);
 234     return 0;
 235   }
 236   return This->RefCount;
 237 }
 238
 239 static HRESULT WINAPI StdProxy_Connect(LPRPCPROXYBUFFER iface,
 240                                       LPRPCCHANNELBUFFER pChannel)
 241 {
 242   ICOM_THIS_MULTI(StdProxyImpl,lpVtbl,iface);
 243   TRACE("(%p)->Connect(%p)\n",This,pChannel);
 244
 245   This->pChannel = pChannel;
 246   return S_OK;
 247 }
 248
 249 static VOID WINAPI StdProxy_Disconnect(LPRPCPROXYBUFFER iface)
 250 {
 251   ICOM_THIS_MULTI(StdProxyImpl,lpVtbl,iface);
 252   TRACE("(%p)->Disconnect()\n",This);
 253
 254   This->pChannel = NULL;
 255 }
 256
 257 static ICOM_VTABLE(IRpcProxyBuffer) StdProxy_Vtbl =
 258 {
 259   ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
 260   StdProxy_QueryInterface,
 261   StdProxy_AddRef,
 262   StdProxy_Release,
 263   StdProxy_Connect,
 264   StdProxy_Disconnect
 265 };
 266
 267 HRESULT WINAPI StdProxy_GetChannel(LPVOID iface,
 268                                   LPRPCCHANNELBUFFER *ppChannel)
 269 {
 270   ICOM_THIS_MULTI(StdProxyImpl,PVtbl,iface);
 271   TRACE("(%p)->GetChannel(%p) %s\n",This,ppChannel,This->name);
 272
 273   *ppChannel = This->pChannel;
 274   return S_OK;
 275 }
 276
 277 HRESULT WINAPI StdProxy_GetIID(LPVOID iface,
 278                               const IID **ppiid)
 279 {
 280   ICOM_THIS_MULTI(StdProxyImpl,PVtbl,iface);
 281   TRACE("(%p)->GetIID(%p) %s\n",This,ppiid,This->name);
 282
 283   *ppiid = This->piid;
 284   return S_OK;
 285 }
 286
 287 HRESULT WINAPI IUnknown_QueryInterface_Proxy(LPUNKNOWN iface,
 288                                             REFIID riid,
 289                                             LPVOID *ppvObj)
 290 {
 291   ICOM_THIS_MULTI(StdProxyImpl,PVtbl,iface);
 292   TRACE("(%p)->QueryInterface(%s,%p) %s\n",This,debugstr_guid(riid),ppvObj,This->name);
 293   return IUnknown_QueryInterface(This->pUnkOuter,riid,ppvObj);
 294 }
 295
 296 ULONG WINAPI IUnknown_AddRef_Proxy(LPUNKNOWN iface)
 297 {
 298   ICOM_THIS_MULTI(StdProxyImpl,PVtbl,iface);
 299   TRACE("(%p)->AddRef() %s\n",This,This->name);
 300 #if 0 /* interface refcounting */
 301   return ++(This->RefCount);
 302 #else /* object refcounting */
 303   return IUnknown_AddRef(This->pUnkOuter);
 304 #endif
 305 }
 306
 307 ULONG WINAPI IUnknown_Release_Proxy(LPUNKNOWN iface)
 308 {
 309   ICOM_THIS_MULTI(StdProxyImpl,PVtbl,iface);
 310   TRACE("(%p)->Release() %s\n",This,This->name);
 311 #if 0 /* interface refcounting */
 312   if (!--(This->RefCount)) {
 313     StdProxy_Destruct((LPRPCPROXYBUFFER)&This->lpVtbl);
 314     return 0;
 315   }
 316   return This->RefCount;
 317 #else /* object refcounting */
 318   return IUnknown_Release(This->pUnkOuter);
 319 #endif
 320 }
 321