dlls/rpcrt4/ndr_contexthandle.c

   1 /*
   2  * NDR data marshalling
   3  *
   4  * Copyright 2006 Mike McCormack (for CodeWeavers)
   5  * Copyright 2006-2007 Robert Shearman (for CodeWeavers)
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #include "ndr_misc.h"
  23 #include "rpc_assoc.h"
  24 #include "rpcndr.h"
  25
  26 #include "wine/rpcfc.h"
  27
  28 #include "wine/debug.h"
  29 #include "wine/list.h"
  30
  31 WINE_DEFAULT_DEBUG_CHANNEL(ole);
  32
  33 #define NDR_CONTEXT_HANDLE_MAGIC 0x4352444e
  34
  35 typedef struct ndr_context_handle
  36 {
  37     ULONG      attributes;
  38     GUID       uuid;
  39 } ndr_context_handle;
  40
  41 struct context_handle_entry
  42 {
  43     struct list entry;
  44     DWORD magic;
  45     RPC_BINDING_HANDLE handle;
  46     ndr_context_handle wire_data;
  47 };
  48
  49 static struct list context_handle_list = LIST_INIT(context_handle_list);
  50
  51 static CRITICAL_SECTION ndr_context_cs;
  52 static CRITICAL_SECTION_DEBUG ndr_context_debug =
  53 {
  54     0, 0, &ndr_context_cs,
  55     { &ndr_context_debug.ProcessLocksList, &ndr_context_debug.ProcessLocksList },
  56       0, 0, { (DWORD_PTR)(__FILE__ ": ndr_context") }
  57 };
  58 static CRITICAL_SECTION ndr_context_cs = { &ndr_context_debug, -1, 0, 0, 0, 0 };
  59
  60 static struct context_handle_entry *get_context_entry(NDR_CCONTEXT CContext)
  61 {
  62     struct context_handle_entry *che = CContext;
  63
  64     if (che->magic != NDR_CONTEXT_HANDLE_MAGIC)
  65         return NULL;
  66     return che;
  67 }
  68
  69 static struct context_handle_entry *context_entry_from_guid(LPCGUID uuid)
  70 {
  71     struct context_handle_entry *che;
  72     LIST_FOR_EACH_ENTRY(che, &context_handle_list, struct context_handle_entry, entry)
  73         if (IsEqualGUID(&che->wire_data.uuid, uuid))
  74             return che;
  75     return NULL;
  76 }
  77
  78 RPC_BINDING_HANDLE WINAPI NDRCContextBinding(NDR_CCONTEXT CContext)
  79 {
  80     struct context_handle_entry *che;
  81     RPC_BINDING_HANDLE handle = NULL;
  82
  83     TRACE("%p\n", CContext);
  84
  85     EnterCriticalSection(&ndr_context_cs);
  86     che = get_context_entry(CContext);
  87     if (che)
  88         handle = che->handle;
  89     LeaveCriticalSection(&ndr_context_cs);
  90
  91     if (!handle)
  92     {
  93         ERR("invalid handle %p\n", CContext);
  94         RpcRaiseException(ERROR_INVALID_HANDLE);
  95     }
  96     return handle;
  97 }
  98
  99 void WINAPI NDRCContextMarshall(NDR_CCONTEXT CContext, void *pBuff)
 100 {
 101     struct context_handle_entry *che;
 102
 103     TRACE("%p %p\n", CContext, pBuff);
 104
 105     if (CContext)
 106     {
 107         EnterCriticalSection(&ndr_context_cs);
 108         che = get_context_entry(CContext);
 109         memcpy(pBuff, &che->wire_data, sizeof (ndr_context_handle));
 110         LeaveCriticalSection(&ndr_context_cs);
 111     }
 112     else
 113     {
 114         ndr_context_handle *wire_data = pBuff;
 115         wire_data->attributes = 0;
 116         wire_data->uuid = GUID_NULL;
 117     }
 118 }
 119
 120 /***********************************************************************
 121  *           RpcSmDestroyClientContext [RPCRT4.@]
 122  */
 123 RPC_STATUS WINAPI RpcSmDestroyClientContext(void **ContextHandle)
 124 {
 125     RPC_STATUS status = RPC_X_SS_CONTEXT_MISMATCH;
 126     struct context_handle_entry *che = NULL;
 127
 128     TRACE("(%p)\n", ContextHandle);
 129
 130     EnterCriticalSection(&ndr_context_cs);
 131     che = get_context_entry(*ContextHandle);
 132     *ContextHandle = NULL;
 133     if (che)
 134     {
 135         status = RPC_S_OK;
 136         list_remove(&che->entry);
 137     }
 138
 139     LeaveCriticalSection(&ndr_context_cs);
 140
 141     if (che)
 142     {
 143         RpcBindingFree(&che->handle);
 144         HeapFree(GetProcessHeap(), 0, che);
 145     }
 146
 147     return status;
 148 }
 149
 150 /***********************************************************************
 151  *           RpcSsDestroyClientContext [RPCRT4.@]
 152  */
 153 void WINAPI RpcSsDestroyClientContext(void **ContextHandle)
 154 {
 155     RPC_STATUS status = RpcSmDestroyClientContext(ContextHandle);
 156     if (status != RPC_S_OK)
 157         RpcRaiseException(status);
 158 }
 159
 160 static UINT ndr_update_context_handle(NDR_CCONTEXT *CContext,
 161                                       RPC_BINDING_HANDLE hBinding,
 162                                       const ndr_context_handle *chi)
 163 {
 164     struct context_handle_entry *che = NULL;
 165
 166     /* a null UUID means we should free the context handle */
 167     if (IsEqualGUID(&chi->uuid, &GUID_NULL))
 168     {
 169         if (*CContext)
 170         {
 171             che = get_context_entry(*CContext);
 172             if (!che)
 173                 return ERROR_INVALID_HANDLE;
 174             list_remove(&che->entry);
 175             RpcBindingFree(&che->handle);
 176             HeapFree(GetProcessHeap(), 0, che);
 177             che = NULL;
 178         }
 179     }
 180     /* if there's no existing entry matching the GUID, allocate one */
 181     else if (!(che = context_entry_from_guid(&chi->uuid)))
 182     {
 183         che = HeapAlloc(GetProcessHeap(), 0, sizeof *che);
 184         if (!che)
 185             return ERROR_NOT_ENOUGH_MEMORY;
 186         che->magic = NDR_CONTEXT_HANDLE_MAGIC;
 187         RpcBindingCopy(hBinding, &che->handle);
 188         list_add_tail(&context_handle_list, &che->entry);
 189         che->wire_data = *chi;
 190     }
 191
 192     *CContext = che;
 193
 194     return ERROR_SUCCESS;
 195 }
 196
 197 /***********************************************************************
 198  *           NDRCContextUnmarshall [RPCRT4.@]
 199  */
 200 void WINAPI NDRCContextUnmarshall(NDR_CCONTEXT *CContext,
 201                                   RPC_BINDING_HANDLE hBinding,
 202                                   void *pBuff, ULONG DataRepresentation)
 203 {
 204     UINT r;
 205
 206     TRACE("*%p=(%p) %p %p %08x\n",
 207           CContext, *CContext, hBinding, pBuff, DataRepresentation);
 208
 209     EnterCriticalSection(&ndr_context_cs);
 210     r = ndr_update_context_handle(CContext, hBinding, pBuff);
 211     LeaveCriticalSection(&ndr_context_cs);
 212     if (r)
 213         RpcRaiseException(r);
 214 }
 215
 216 /***********************************************************************
 217  *           NDRSContextMarshall [RPCRT4.@]
 218  */
 219 void WINAPI NDRSContextMarshall(NDR_SCONTEXT SContext,
 220                                void *pBuff,
 221                                NDR_RUNDOWN userRunDownIn)
 222 {
 223     TRACE("(%p %p %p)\n", SContext, pBuff, userRunDownIn);
 224     NDRSContextMarshall2(I_RpcGetCurrentCallHandle(), SContext, pBuff,
 225                          userRunDownIn, NULL, RPC_CONTEXT_HANDLE_DEFAULT_FLAGS);
 226 }
 227
 228 /***********************************************************************
 229  *           NDRSContextMarshallEx [RPCRT4.@]
 230  */
 231 void WINAPI NDRSContextMarshallEx(RPC_BINDING_HANDLE hBinding,
 232                                   NDR_SCONTEXT SContext,
 233                                   void *pBuff,
 234                                   NDR_RUNDOWN userRunDownIn)
 235 {
 236     TRACE("(%p %p %p %p)\n", hBinding, SContext, pBuff, userRunDownIn);
 237     NDRSContextMarshall2(hBinding, SContext, pBuff, userRunDownIn, NULL,
 238                          RPC_CONTEXT_HANDLE_DEFAULT_FLAGS);
 239 }
 240
 241 /***********************************************************************
 242  *           NDRSContextMarshall2 [RPCRT4.@]
 243  */
 244 void WINAPI NDRSContextMarshall2(RPC_BINDING_HANDLE hBinding,
 245                                  NDR_SCONTEXT SContext,
 246                                  void *pBuff,
 247                                  NDR_RUNDOWN userRunDownIn,
 248                                  void *CtxGuard, ULONG Flags)
 249 {
 250     RpcBinding *binding = hBinding;
 251     RPC_STATUS status;
 252     ndr_context_handle *ndr = pBuff;
 253
 254     TRACE("(%p %p %p %p %p %u)\n",
 255           hBinding, SContext, pBuff, userRunDownIn, CtxGuard, Flags);
 256
 257     if (!binding->server || !binding->Assoc)
 258         RpcRaiseException(ERROR_INVALID_HANDLE);
 259
 260     if (Flags & RPC_CONTEXT_HANDLE_FLAGS)
 261         FIXME("unimplemented flags: 0x%x\n", Flags & RPC_CONTEXT_HANDLE_FLAGS);
 262
 263     if (SContext->userContext)
 264     {
 265         status = RpcServerAssoc_UpdateContextHandle(binding->Assoc, SContext, CtxGuard, userRunDownIn);
 266         if (status != RPC_S_OK)
 267             RpcRaiseException(status);
 268         ndr->attributes = 0;
 269         RpcContextHandle_GetUuid(SContext, &ndr->uuid);
 270
 271         RPCRT4_RemoveThreadContextHandle(SContext);
 272         RpcServerAssoc_ReleaseContextHandle(binding->Assoc, SContext, TRUE);
 273     }
 274     else
 275     {
 276         if (!RpcContextHandle_IsGuardCorrect(SContext, CtxGuard))
 277             RpcRaiseException(ERROR_INVALID_HANDLE);
 278         memset(ndr, 0, sizeof(*ndr));
 279
 280         RPCRT4_RemoveThreadContextHandle(SContext);
 281         /* Note: release the context handle twice in this case to release
 282          * one ref being kept around for the data and one ref for the
 283          * unmarshall/marshall sequence */
 284         if (!RpcServerAssoc_ReleaseContextHandle(binding->Assoc, SContext, TRUE))
 285             return; /* this is to cope with the case of the data not being valid
 286                      * before and so not having a further reference */
 287         RpcServerAssoc_ReleaseContextHandle(binding->Assoc, SContext, FALSE);
 288     }
 289 }
 290
 291 /***********************************************************************
 292  *           NDRSContextUnmarshall [RPCRT4.@]
 293  */
 294 NDR_SCONTEXT WINAPI NDRSContextUnmarshall(void *pBuff,
 295                                           ULONG DataRepresentation)
 296 {
 297     TRACE("(%p %08x)\n", pBuff, DataRepresentation);
 298     return NDRSContextUnmarshall2(I_RpcGetCurrentCallHandle(), pBuff,
 299                                   DataRepresentation, NULL,
 300                                   RPC_CONTEXT_HANDLE_DEFAULT_FLAGS);
 301 }
 302
 303 /***********************************************************************
 304  *           NDRSContextUnmarshallEx [RPCRT4.@]
 305  */
 306 NDR_SCONTEXT WINAPI NDRSContextUnmarshallEx(RPC_BINDING_HANDLE hBinding,
 307                                             void *pBuff,
 308                                             ULONG DataRepresentation)
 309 {
 310     TRACE("(%p %p %08x)\n", hBinding, pBuff, DataRepresentation);
 311     return NDRSContextUnmarshall2(hBinding, pBuff, DataRepresentation, NULL,
 312                                   RPC_CONTEXT_HANDLE_DEFAULT_FLAGS);
 313 }
 314
 315 /***********************************************************************
 316  *           NDRSContextUnmarshall2 [RPCRT4.@]
 317  */
 318 NDR_SCONTEXT WINAPI NDRSContextUnmarshall2(RPC_BINDING_HANDLE hBinding,
 319                                            void *pBuff,
 320                                            ULONG DataRepresentation,
 321                                            void *CtxGuard, ULONG Flags)
 322 {
 323     RpcBinding *binding = hBinding;
 324     NDR_SCONTEXT SContext;
 325     RPC_STATUS status;
 326     const ndr_context_handle *context_ndr = pBuff;
 327
 328     TRACE("(%p %p %08x %p %u)\n",
 329           hBinding, pBuff, DataRepresentation, CtxGuard, Flags);
 330
 331     if (!binding->server || !binding->Assoc)
 332         RpcRaiseException(ERROR_INVALID_HANDLE);
 333
 334     if (Flags & RPC_CONTEXT_HANDLE_FLAGS)
 335         FIXME("unimplemented flags: 0x%x\n", Flags & RPC_CONTEXT_HANDLE_FLAGS);
 336
 337     if (!pBuff || (!context_ndr->attributes &&
 338                    UuidIsNil((UUID *)&context_ndr->uuid, &status)))
 339         status = RpcServerAssoc_AllocateContextHandle(binding->Assoc, CtxGuard,
 340                                                       &SContext);
 341     else
 342     {
 343         if (context_ndr->attributes)
 344         {
 345             ERR("non-null attributes 0x%x\n", context_ndr->attributes);
 346             status = ERROR_INVALID_HANDLE;
 347         }
 348         else
 349             status = RpcServerAssoc_FindContextHandle(binding->Assoc,
 350                                                       &context_ndr->uuid,
 351                                                       CtxGuard, Flags,
 352                                                       &SContext);
 353     }
 354
 355     if (status != RPC_S_OK)
 356         RpcRaiseException(status);
 357
 358     RPCRT4_PushThreadContextHandle(SContext);
 359     return SContext;
 360 }