reactos/lib/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 #define COBJMACROS
  27
  28 #include "windef.h"
  29 #include "winbase.h"
  30 #include "winerror.h"
  31
  32 #include "objbase.h"
  33 #include "rpcproxy.h"
  34
  35 #include "cpsf.h"
  36 #include "ndr_misc.h"
  37 #include "wine/debug.h"
  38
  39 WINE_DEFAULT_DEBUG_CHANNEL(ole);
  40
  41 struct StublessThunk;
  42
  43 /* I don't know what MS's std proxy structure looks like,
  44    so this probably doesn't match, but that shouldn't matter */
  45 typedef struct {
  46   IRpcProxyBufferVtbl *lpVtbl;
  47   LPVOID *PVtbl;
  48   DWORD RefCount;
  49   const MIDL_STUBLESS_PROXY_INFO *stubless;
  50   const IID* piid;
  51   LPUNKNOWN pUnkOuter;
  52   PCInterfaceName name;
  53   LPPSFACTORYBUFFER pPSFactory;
  54   LPRPCCHANNELBUFFER pChannel;
  55   struct StublessThunk *thunks;
  56 } StdProxyImpl;
  57
  58 static IRpcProxyBufferVtbl StdProxy_Vtbl;
  59
  60 #define ICOM_THIS_MULTI(impl,field,iface) impl* const This=(impl*)((char*)(iface) - offsetof(impl,field))
  61
  62 /* How the Windows stubless proxy thunks work is explained at
  63  * http://msdn.microsoft.com/library/en-us/dnmsj99/html/com0199.asp,
  64  * but I'll use a slightly different method, to make life easier */
  65
  66 #if defined(__i386__)
  67
  68 #include "pshpack1.h"
  69
  70 struct StublessThunk {
  71   BYTE push;
  72   DWORD index;
  73   BYTE call;
  74   LONG handler;
  75   BYTE ret;
  76   WORD bytes;
  77   BYTE pad[3];
  78 };
  79
  80 #include "poppack.h"
  81
  82 /* adjust the stack size since we don't use Windows's method */
  83 #define STACK_ADJUST sizeof(DWORD)
  84
  85 #define FILL_STUBLESS(x,idx,stk) \
  86  x->push = 0x68; /* pushl [immediate] */ \
  87  x->index = (idx); \
  88  x->call = 0xe8; /* call [near] */ \
  89  x->handler = (char*)ObjectStubless - (char*)&x->ret; \
  90  x->ret = 0xc2; /* ret [immediate] */ \
  91  x->bytes = stk; \
  92  x->pad[0] = 0x8d; /* leal (%esi),%esi */ \
  93  x->pad[1] = 0x76; \
  94  x->pad[2] = 0x00;
  95
  96 static HRESULT WINAPI ObjectStubless(DWORD index)
  97 {
  98   char *args = (char*)(&index + 2);
  99   LPVOID iface = *(LPVOID*)args;
 100
 101   ICOM_THIS_MULTI(StdProxyImpl,PVtbl,iface);
 102
 103   PFORMAT_STRING fs = This->stubless->ProcFormatString + This->stubless->FormatStringOffset[index];
 104   unsigned bytes = *(const WORD*)(fs+8) - STACK_ADJUST;
 105   TRACE("(%p)->(%ld)([%d bytes]) ret=%08lx\n", iface, index, bytes, *(DWORD*)(args+bytes));
 106
 107   return RPCRT4_NdrClientCall2(This->stubless->pStubDesc, fs, args);
 108 }
 109
 110 #else  /* __i386__ */
 111
 112 /* can't do that on this arch */
 113 struct StublessThunk { int dummy; };
 114 #define FILL_STUBLESS(x,idx,stk) \
 115  ERR("stubless proxies are not supported on this architecture\n");
 116 #define STACK_ADJUST 0
 117
 118 #endif  /* __i386__ */
 119
 120 HRESULT WINAPI StdProxy_Construct(REFIID riid,
 121                                  LPUNKNOWN pUnkOuter,
 122                                  PCInterfaceName name,
 123                                  CInterfaceProxyVtbl *vtbl,
 124                                  CInterfaceStubVtbl *svtbl,
 125                                  LPPSFACTORYBUFFER pPSFactory,
 126                                  LPRPCPROXYBUFFER *ppProxy,
 127                                  LPVOID *ppvObj)
 128 {
 129   StdProxyImpl *This;
 130   const MIDL_STUBLESS_PROXY_INFO *stubless = NULL;
 131
 132   TRACE("(%p,%p,%p,%p,%p) %s\n", pUnkOuter, vtbl, pPSFactory, ppProxy, ppvObj, name);
 133
 134   /* I can't find any other way to detect stubless proxies than this hack */
 135   if (!IsEqualGUID(vtbl->header.piid, riid)) {
 136     stubless = *(const void **)vtbl;
 137     vtbl = (CInterfaceProxyVtbl *)((const void **)vtbl + 1);
 138     TRACE("stubless=%p\n", stubless);
 139   }
 140
 141   TRACE("iid=%s\n", debugstr_guid(vtbl->header.piid));
 142   TRACE("vtbl=%p\n", vtbl->Vtbl);
 143
 144   if (!IsEqualGUID(vtbl->header.piid, riid)) {
 145     ERR("IID mismatch during proxy creation\n");
 146     return RPC_E_UNEXPECTED;
 147   }
 148
 149   This = HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,sizeof(StdProxyImpl));
 150   if (!This) return E_OUTOFMEMORY;
 151
 152   if (stubless) {
 153     unsigned i, count = svtbl->header.DispatchTableCount;
 154     /* Maybe the original vtbl is just modified directly to point at
 155      * ObjectStublessClientXXX thunks in real Windows, but I don't like it
 156      */
 157     TRACE("stubless thunks: count=%d\n", count);
 158     This->thunks = HeapAlloc(GetProcessHeap(),0,sizeof(struct StublessThunk)*count);
 159     This->PVtbl = HeapAlloc(GetProcessHeap(),0,sizeof(LPVOID)*count);
 160     for (i=0; i<count; i++) {
 161       struct StublessThunk *thunk = &This->thunks[i];
 162       if (vtbl->Vtbl[i] == (LPVOID)-1) {
 163         PFORMAT_STRING fs = stubless->ProcFormatString + stubless->FormatStringOffset[i];
 164         unsigned bytes = *(const WORD*)(fs+8) - STACK_ADJUST;
 165         TRACE("method %d: stacksize=%d\n", i, bytes);
 166         FILL_STUBLESS(thunk, i, bytes)
 167         This->PVtbl[i] = thunk;
 168       }
 169       else {
 170         memset(thunk, 0, sizeof(struct StublessThunk));
 171         This->PVtbl[i] = vtbl->Vtbl[i];
 172       }
 173     }
 174   }
 175   else
 176     This->PVtbl = vtbl->Vtbl;
 177
 178   This->lpVtbl = &StdProxy_Vtbl;
 179   /* 1 reference for the proxy and 1 for the object */
 180   This->RefCount = 2;
 181   This->stubless = stubless;
 182   This->piid = vtbl->header.piid;
 183   This->pUnkOuter = pUnkOuter;
 184   This->name = name;
 185   This->pPSFactory = pPSFactory;
 186   This->pChannel = NULL;
 187   *ppProxy = (LPRPCPROXYBUFFER)&This->lpVtbl;
 188   *ppvObj = &This->PVtbl;
 189   IPSFactoryBuffer_AddRef(pPSFactory);
 190
 191   return S_OK;
 192 }
 193
 194 static void WINAPI StdProxy_Destruct(LPRPCPROXYBUFFER iface)
 195 {
 196   ICOM_THIS_MULTI(StdProxyImpl,lpVtbl,iface);
 197
 198   if (This->pChannel)
 199     IRpcProxyBuffer_Disconnect(iface);
 200
 201   IPSFactoryBuffer_Release(This->pPSFactory);
 202   if (This->thunks) {
 203     HeapFree(GetProcessHeap(),0,This->PVtbl);
 204     HeapFree(GetProcessHeap(),0,This->thunks);
 205   }
 206   HeapFree(GetProcessHeap(),0,This);
 207 }
 208
 209 static HRESULT WINAPI StdProxy_QueryInterface(LPRPCPROXYBUFFER iface,
 210                                              REFIID riid,
 211                                              LPVOID *obj)
 212 {
 213   ICOM_THIS_MULTI(StdProxyImpl,lpVtbl,iface);
 214   TRACE("(%p)->QueryInterface(%s,%p)\n",This,debugstr_guid(riid),obj);
 215
 216   if (IsEqualGUID(&IID_IUnknown,riid) ||
 217       IsEqualGUID(This->piid,riid)) {
 218     *obj = &This->PVtbl;
 219     This->RefCount++;
 220     return S_OK;
 221   }
 222
 223   if (IsEqualGUID(&IID_IRpcProxyBuffer,riid)) {
 224     *obj = &This->lpVtbl;
 225     This->RefCount++;
 226     return S_OK;
 227   }
 228
 229   return E_NOINTERFACE;
 230 }
 231
 232 static ULONG WINAPI StdProxy_AddRef(LPRPCPROXYBUFFER iface)
 233 {
 234   ICOM_THIS_MULTI(StdProxyImpl,lpVtbl,iface);
 235   TRACE("(%p)->AddRef()\n",This);
 236
 237   return ++(This->RefCount);
 238 }
 239
 240 static ULONG WINAPI StdProxy_Release(LPRPCPROXYBUFFER iface)
 241 {
 242   ICOM_THIS_MULTI(StdProxyImpl,lpVtbl,iface);
 243   TRACE("(%p)->Release()\n",This);
 244
 245   if (!--(This->RefCount)) {
 246     StdProxy_Destruct((LPRPCPROXYBUFFER)&This->lpVtbl);
 247     return 0;
 248   }
 249   return This->RefCount;
 250 }
 251
 252 static HRESULT WINAPI StdProxy_Connect(LPRPCPROXYBUFFER iface,
 253                                       LPRPCCHANNELBUFFER pChannel)
 254 {
 255   ICOM_THIS_MULTI(StdProxyImpl,lpVtbl,iface);
 256   TRACE("(%p)->Connect(%p)\n",This,pChannel);
 257
 258   This->pChannel = pChannel;
 259   IRpcChannelBuffer_AddRef(pChannel);
 260   return S_OK;
 261 }
 262
 263 static VOID WINAPI StdProxy_Disconnect(LPRPCPROXYBUFFER iface)
 264 {
 265   ICOM_THIS_MULTI(StdProxyImpl,lpVtbl,iface);
 266   TRACE("(%p)->Disconnect()\n",This);
 267
 268   IRpcChannelBuffer_Release(This->pChannel);
 269   This->pChannel = NULL;
 270 }
 271
 272 static IRpcProxyBufferVtbl StdProxy_Vtbl =
 273 {
 274   StdProxy_QueryInterface,
 275   StdProxy_AddRef,
 276   StdProxy_Release,
 277   StdProxy_Connect,
 278   StdProxy_Disconnect
 279 };
 280
 281 HRESULT WINAPI StdProxy_GetChannel(LPVOID iface,
 282                                   LPRPCCHANNELBUFFER *ppChannel)
 283 {
 284   ICOM_THIS_MULTI(StdProxyImpl,PVtbl,iface);
 285   TRACE("(%p)->GetChannel(%p) %s\n",This,ppChannel,This->name);
 286
 287   *ppChannel = This->pChannel;
 288   return S_OK;
 289 }
 290
 291 HRESULT WINAPI StdProxy_GetIID(LPVOID iface,
 292                               const IID **ppiid)
 293 {
 294   ICOM_THIS_MULTI(StdProxyImpl,PVtbl,iface);
 295   TRACE("(%p)->GetIID(%p) %s\n",This,ppiid,This->name);
 296
 297   *ppiid = This->piid;
 298   return S_OK;
 299 }
 300
 301 HRESULT WINAPI IUnknown_QueryInterface_Proxy(LPUNKNOWN iface,
 302                                             REFIID riid,
 303                                             LPVOID *ppvObj)
 304 {
 305   ICOM_THIS_MULTI(StdProxyImpl,PVtbl,iface);
 306   TRACE("(%p)->QueryInterface(%s,%p) %s\n",This,debugstr_guid(riid),ppvObj,This->name);
 307   return IUnknown_QueryInterface(This->pUnkOuter,riid,ppvObj);
 308 }
 309
 310 ULONG WINAPI IUnknown_AddRef_Proxy(LPUNKNOWN iface)
 311 {
 312   ICOM_THIS_MULTI(StdProxyImpl,PVtbl,iface);
 313   TRACE("(%p)->AddRef() %s\n",This,This->name);
 314 #if 0 /* interface refcounting */
 315   return ++(This->RefCount);
 316 #else /* object refcounting */
 317   return IUnknown_AddRef(This->pUnkOuter);
 318 #endif
 319 }
 320
 321 ULONG WINAPI IUnknown_Release_Proxy(LPUNKNOWN iface)
 322 {
 323   ICOM_THIS_MULTI(StdProxyImpl,PVtbl,iface);
 324   TRACE("(%p)->Release() %s\n",This,This->name);
 325 #if 0 /* interface refcounting */
 326   if (!--(This->RefCount)) {
 327     StdProxy_Destruct((LPRPCPROXYBUFFER)&This->lpVtbl);
 328     return 0;
 329   }
 330   return This->RefCount;
 331 #else /* object refcounting */
 332   return IUnknown_Release(This->pUnkOuter);
 333 #endif
 334 }
 335
 336 HRESULT WINAPI
 337 CreateProxyFromTypeInfo( LPTYPEINFO pTypeInfo, LPUNKNOWN pUnkOuter, REFIID riid,
 338                          LPRPCPROXYBUFFER *ppProxy, LPVOID *ppv )
 339 {
 340     FIXME("%p %p %s %p %p\n", pTypeInfo, pUnkOuter, debugstr_guid(riid), ppProxy, ppv);
 341     return E_NOTIMPL;
 342 }