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 = (struct context_handle_entry*) 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         RpcRaiseException(ERROR_INVALID_HANDLE);
  93     return handle;
  94 }
  95
  96 void WINAPI NDRCContextMarshall(NDR_CCONTEXT CContext, void *pBuff)
  97 {
  98     struct context_handle_entry *che;
  99
 100     TRACE("%p %p\n", CContext, pBuff);
 101
 102     if (CContext)
 103     {
 104         EnterCriticalSection(&ndr_context_cs);
 105         che = get_context_entry(CContext);
 106         memcpy(pBuff, &che->wire_data, sizeof (ndr_context_handle));
 107         LeaveCriticalSection(&ndr_context_cs);
 108     }
 109     else
 110     {
 111         ndr_context_handle *wire_data = (ndr_context_handle *)pBuff;
 112         wire_data->attributes = 0;
 113         wire_data->uuid = GUID_NULL;
 114     }
 115 }
 116
 117 /***********************************************************************
 118  *           RpcSmDestroyClientContext [RPCRT4.@]
 119  */
 120 RPC_STATUS WINAPI RpcSmDestroyClientContext(void **ContextHandle)
 121 {
 122     RPC_STATUS status = RPC_X_SS_CONTEXT_MISMATCH;
 123     struct context_handle_entry *che = NULL;
 124
 125     TRACE("(%p)\n", ContextHandle);
 126
 127     EnterCriticalSection(&ndr_context_cs);
 128     che = get_context_entry(*ContextHandle);
 129     *ContextHandle = NULL;
 130     if (che)
 131     {
 132         status = RPC_S_OK;
 133         list_remove(&che->entry);
 134     }
 135
 136     LeaveCriticalSection(&ndr_context_cs);
 137
 138     if (che)
 139     {
 140         RpcBindingFree(&che->handle);
 141         HeapFree(GetProcessHeap(), 0, che);
 142     }
 143
 144     return status;
 145 }
 146
 147 /***********************************************************************
 148  *           RpcSsDestroyClientContext [RPCRT4.@]
 149  */
 150 void WINAPI RpcSsDestroyClientContext(void **ContextHandle)
 151 {
 152     RPC_STATUS status = RpcSmDestroyClientContext(ContextHandle);
 153     if (status != RPC_S_OK)
 154         RpcRaiseException(status);
 155 }
 156
 157 static UINT ndr_update_context_handle(NDR_CCONTEXT *CContext,
 158                                       RPC_BINDING_HANDLE hBinding,
 159                                       const ndr_context_handle *chi)
 160 {
 161     struct context_handle_entry *che = NULL;
 162
 163     /* a null UUID means we should free the context handle */
 164     if (IsEqualGUID(&chi->uuid, &GUID_NULL))
 165     {
 166         if (*CContext)
 167         {
 168             che = get_context_entry(*CContext);
 169             if (!che)
 170                 return ERROR_INVALID_HANDLE;
 171             list_remove(&che->entry);
 172             RpcBindingFree(&che->handle);
 173             HeapFree(GetProcessHeap(), 0, che);
 174             che = NULL;
 175         }
 176     }
 177     /* if there's no existing entry matching the GUID, allocate one */
 178     else if (!(che = context_entry_from_guid(&chi->uuid)))
 179     {
 180         che = HeapAlloc(GetProcessHeap(), 0, sizeof *che);
 181         if (!che)
 182             return ERROR_NOT_ENOUGH_MEMORY;
 183         che->magic = NDR_CONTEXT_HANDLE_MAGIC;
 184         RpcBindingCopy(hBinding, &che->handle);
 185         list_add_tail(&context_handle_list, &che->entry);
 186         memcpy(&che->wire_data, chi, sizeof *chi);
 187     }
 188
 189     *CContext = che;
 190
 191     return ERROR_SUCCESS;
 192 }
 193
 194 /***********************************************************************
 195  *           NDRCContextUnmarshall [RPCRT4.@]
 196  */
 197 void WINAPI NDRCContextUnmarshall(NDR_CCONTEXT *CContext,
 198                                   RPC_BINDING_HANDLE hBinding,
 199                                   void *pBuff, ULONG DataRepresentation)
 200 {
 201     UINT r;
 202
 203     TRACE("*%p=(%p) %p %p %08x\n",
 204           CContext, *CContext, hBinding, pBuff, DataRepresentation);
 205
 206     EnterCriticalSection(&ndr_context_cs);
 207     r = ndr_update_context_handle(CContext, hBinding, pBuff);
 208     LeaveCriticalSection(&ndr_context_cs);
 209     if (r)
 210         RpcRaiseException(r);
 211 }
 212
 213 /***********************************************************************
 214  *           NDRSContextMarshall [RPCRT4.@]
 215  */
 216 void WINAPI NDRSContextMarshall(NDR_SCONTEXT SContext,
 217                                void *pBuff,
 218                                NDR_RUNDOWN userRunDownIn)
 219 {
 220     TRACE("(%p %p %p)\n", SContext, pBuff, userRunDownIn);
 221     NDRSContextMarshall2(I_RpcGetCurrentCallHandle(), SContext, pBuff, userRunDownIn, NULL, 0);
 222 }
 223
 224 /***********************************************************************
 225  *           NDRSContextMarshallEx [RPCRT4.@]
 226  */
 227 void WINAPI NDRSContextMarshallEx(RPC_BINDING_HANDLE hBinding,
 228                                   NDR_SCONTEXT SContext,
 229                                   void *pBuff,
 230                                   NDR_RUNDOWN userRunDownIn)
 231 {
 232     TRACE("(%p %p %p %p)\n", hBinding, SContext, pBuff, userRunDownIn);
 233     NDRSContextMarshall2(hBinding, SContext, pBuff, userRunDownIn, NULL, 0);
 234 }
 235
 236 /***********************************************************************
 237  *           NDRSContextMarshall2 [RPCRT4.@]
 238  */
 239 void WINAPI NDRSContextMarshall2(RPC_BINDING_HANDLE hBinding,
 240                                  NDR_SCONTEXT SContext,
 241                                  void *pBuff,
 242                                  NDR_RUNDOWN userRunDownIn,
 243                                  void *CtxGuard, ULONG Flags)
 244 {
 245     RpcBinding *binding = hBinding;
 246     RPC_STATUS status;
 247     ndr_context_handle *ndr = pBuff;
 248
 249     TRACE("(%p %p %p %p %p %u)\n",
 250           hBinding, SContext, pBuff, userRunDownIn, CtxGuard, Flags);
 251
 252     if (!binding->server || !binding->Assoc)
 253         RpcRaiseException(ERROR_INVALID_HANDLE);
 254
 255     if (SContext->userContext)
 256     {
 257         status = RpcServerAssoc_UpdateContextHandle(binding->Assoc, SContext, CtxGuard, userRunDownIn);
 258         if (status != RPC_S_OK)
 259             RpcRaiseException(status);
 260         ndr->attributes = 0;
 261         RpcContextHandle_GetUuid(SContext, &ndr->uuid);
 262     }
 263     else
 264     {
 265         if (!RpcContextHandle_IsGuardCorrect(SContext, CtxGuard))
 266             RpcRaiseException(ERROR_INVALID_HANDLE);
 267         memset(ndr, 0, sizeof(*ndr));
 268         /* Note: release the context handle twice in this case to release
 269          * one ref being kept around for the data and one ref for the
 270          * unmarshall/marshall sequence */
 271         if (!RpcServerAssoc_ReleaseContextHandle(binding->Assoc, SContext, FALSE))
 272             return; /* this is to cope with the case of the data not being valid
 273                      * before and so not having a further reference */
 274     }
 275     RpcServerAssoc_ReleaseContextHandle(binding->Assoc, SContext, TRUE);
 276 }
 277
 278 /***********************************************************************
 279  *           NDRSContextUnmarshall [RPCRT4.@]
 280  */
 281 NDR_SCONTEXT WINAPI NDRSContextUnmarshall(void *pBuff,
 282                                           ULONG DataRepresentation)
 283 {
 284     TRACE("(%p %08x)\n", pBuff, DataRepresentation);
 285     return NDRSContextUnmarshall2(I_RpcGetCurrentCallHandle(), pBuff, DataRepresentation, NULL, 0);
 286 }
 287
 288 /***********************************************************************
 289  *           NDRSContextUnmarshallEx [RPCRT4.@]
 290  */
 291 NDR_SCONTEXT WINAPI NDRSContextUnmarshallEx(RPC_BINDING_HANDLE hBinding,
 292                                             void *pBuff,
 293                                             ULONG DataRepresentation)
 294 {
 295     TRACE("(%p %p %08x)\n", hBinding, pBuff, DataRepresentation);
 296     return NDRSContextUnmarshall2(hBinding, pBuff, DataRepresentation, NULL, 0);
 297 }
 298
 299 /***********************************************************************
 300  *           NDRSContextUnmarshall2 [RPCRT4.@]
 301  */
 302 NDR_SCONTEXT WINAPI NDRSContextUnmarshall2(RPC_BINDING_HANDLE hBinding,
 303                                            void *pBuff,
 304                                            ULONG DataRepresentation,
 305                                            void *CtxGuard, ULONG Flags)
 306 {
 307     RpcBinding *binding = hBinding;
 308     NDR_SCONTEXT SContext;
 309     RPC_STATUS status;
 310
 311     TRACE("(%p %p %08x %p %u)\n",
 312           hBinding, pBuff, DataRepresentation, CtxGuard, Flags);
 313
 314     if (!binding->server || !binding->Assoc)
 315         RpcRaiseException(ERROR_INVALID_HANDLE);
 316
 317     if (!pBuff)
 318         status = RpcServerAssoc_AllocateContextHandle(binding->Assoc, CtxGuard,
 319                                                       &SContext);
 320     else
 321     {
 322         const ndr_context_handle *context_ndr = pBuff;
 323         if (context_ndr->attributes)
 324         {
 325             ERR("non-null attributes 0x%x\n", context_ndr->attributes);
 326             status = ERROR_INVALID_HANDLE;
 327         }
 328         else
 329             status = RpcServerAssoc_FindContextHandle(binding->Assoc,
 330                                                       &context_ndr->uuid,
 331                                                       CtxGuard, Flags,
 332                                                       &SContext);
 333     }
 334
 335     if (status != RPC_S_OK)
 336         RpcRaiseException(status);
 337
 338     return SContext;
 339 }