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

   1 /*
   2  * RPC messages
   3  *
   4  * Copyright 2001-2002 Ove Kåven, TransGaming Technologies
   5  * Copyright 2004 Filip Navara
   6  * Copyright 2006 CodeWeavers
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 #include <stdarg.h>
  24 #include <stdio.h>
  25 #include <string.h>
  26
  27 #include "windef.h"
  28 #include "winbase.h"
  29 #include "winerror.h"
  30
  31 #include "rpc.h"
  32 #include "rpcndr.h"
  33 #include "rpcdcep.h"
  34
  35 #include "wine/debug.h"
  36
  37 #include "rpc_binding.h"
  38 #include "rpc_defs.h"
  39 #include "rpc_message.h"
  40 #include "ncastatus.h"
  41
  42 WINE_DEFAULT_DEBUG_CHANNEL(rpc);
  43
  44 /* note: the DCE/RPC spec says the alignment amount should be 4, but
  45  * MS/RPC servers seem to always use 16 */
  46 #define AUTH_ALIGNMENT 16
  47
  48 /* gets the amount needed to round a value up to the specified alignment */
  49 #define ROUND_UP_AMOUNT(value, alignment) \
  50     (((alignment) - (((value) % (alignment)))) % (alignment))
  51 #define ROUND_UP(value, alignment) (((value) + ((alignment) - 1)) & ~((alignment)-1))
  52
  53 enum secure_packet_direction
  54 {
  55   SECURE_PACKET_SEND,
  56   SECURE_PACKET_RECEIVE
  57 };
  58
  59 static RPC_STATUS I_RpcReAllocateBuffer(PRPC_MESSAGE pMsg);
  60
  61 static DWORD RPCRT4_GetHeaderSize(const RpcPktHdr *Header)
  62 {
  63   static const DWORD header_sizes[] = {
  64     sizeof(Header->request), 0, sizeof(Header->response),
  65     sizeof(Header->fault), 0, 0, 0, 0, 0, 0, 0, sizeof(Header->bind),
  66     sizeof(Header->bind_ack), sizeof(Header->bind_nack),
  67     0, 0, 0, 0, 0
  68   };
  69   ULONG ret = 0;
  70
  71   if (Header->common.ptype < sizeof(header_sizes) / sizeof(header_sizes[0])) {
  72     ret = header_sizes[Header->common.ptype];
  73     if (ret == 0)
  74       FIXME("unhandled packet type\n");
  75     if (Header->common.flags & RPC_FLG_OBJECT_UUID)
  76       ret += sizeof(UUID);
  77   } else {
  78     TRACE("invalid packet type\n");
  79   }
  80
  81   return ret;
  82 }
  83
  84 static int packet_has_body(const RpcPktHdr *Header)
  85 {
  86     return (Header->common.ptype == PKT_FAULT) ||
  87            (Header->common.ptype == PKT_REQUEST) ||
  88            (Header->common.ptype == PKT_RESPONSE);
  89 }
  90
  91 static int packet_has_auth_verifier(const RpcPktHdr *Header)
  92 {
  93     return !(Header->common.ptype == PKT_BIND_NACK) &&
  94            !(Header->common.ptype == PKT_SHUTDOWN);
  95 }
  96
  97 static VOID RPCRT4_BuildCommonHeader(RpcPktHdr *Header, unsigned char PacketType,
  98                               unsigned long DataRepresentation)
  99 {
 100   Header->common.rpc_ver = RPC_VER_MAJOR;
 101   Header->common.rpc_ver_minor = RPC_VER_MINOR;
 102   Header->common.ptype = PacketType;
 103   Header->common.drep[0] = LOBYTE(LOWORD(DataRepresentation));
 104   Header->common.drep[1] = HIBYTE(LOWORD(DataRepresentation));
 105   Header->common.drep[2] = LOBYTE(HIWORD(DataRepresentation));
 106   Header->common.drep[3] = HIBYTE(HIWORD(DataRepresentation));
 107   Header->common.auth_len = 0;
 108   Header->common.call_id = 1;
 109   Header->common.flags = 0;
 110   /* Flags and fragment length are computed in RPCRT4_Send. */
 111 }
 112
 113 static RpcPktHdr *RPCRT4_BuildRequestHeader(unsigned long DataRepresentation,
 114                                      unsigned long BufferLength,
 115                                      unsigned short ProcNum,
 116                                      UUID *ObjectUuid)
 117 {
 118   RpcPktHdr *header;
 119   BOOL has_object;
 120   RPC_STATUS status;
 121
 122   has_object = (ObjectUuid != NULL && !UuidIsNil(ObjectUuid, &status));
 123   header = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
 124                      sizeof(header->request) + (has_object ? sizeof(UUID) : 0));
 125   if (header == NULL) {
 126     return NULL;
 127   }
 128
 129   RPCRT4_BuildCommonHeader(header, PKT_REQUEST, DataRepresentation);
 130   header->common.frag_len = sizeof(header->request);
 131   header->request.alloc_hint = BufferLength;
 132   header->request.context_id = 0;
 133   header->request.opnum = ProcNum;
 134   if (has_object) {
 135     header->common.flags |= RPC_FLG_OBJECT_UUID;
 136     header->common.frag_len += sizeof(UUID);
 137     memcpy(&header->request + 1, ObjectUuid, sizeof(UUID));
 138   }
 139
 140   return header;
 141 }
 142
 143 RpcPktHdr *RPCRT4_BuildResponseHeader(unsigned long DataRepresentation,
 144                                       unsigned long BufferLength)
 145 {
 146   RpcPktHdr *header;
 147
 148   header = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(header->response));
 149   if (header == NULL) {
 150     return NULL;
 151   }
 152
 153   RPCRT4_BuildCommonHeader(header, PKT_RESPONSE, DataRepresentation);
 154   header->common.frag_len = sizeof(header->response);
 155   header->response.alloc_hint = BufferLength;
 156
 157   return header;
 158 }
 159
 160 RpcPktHdr *RPCRT4_BuildFaultHeader(unsigned long DataRepresentation,
 161                                    RPC_STATUS Status)
 162 {
 163   RpcPktHdr *header;
 164
 165   header = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(header->fault));
 166   if (header == NULL) {
 167     return NULL;
 168   }
 169
 170   RPCRT4_BuildCommonHeader(header, PKT_FAULT, DataRepresentation);
 171   header->common.frag_len = sizeof(header->fault);
 172   header->fault.status = Status;
 173
 174   return header;
 175 }
 176
 177 RpcPktHdr *RPCRT4_BuildBindHeader(unsigned long DataRepresentation,
 178                                   unsigned short MaxTransmissionSize,
 179                                   unsigned short MaxReceiveSize,
 180                                   unsigned long  AssocGroupId,
 181                                   const RPC_SYNTAX_IDENTIFIER *AbstractId,
 182                                   const RPC_SYNTAX_IDENTIFIER *TransferId)
 183 {
 184   RpcPktHdr *header;
 185
 186   header = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(header->bind));
 187   if (header == NULL) {
 188     return NULL;
 189   }
 190
 191   RPCRT4_BuildCommonHeader(header, PKT_BIND, DataRepresentation);
 192   header->common.frag_len = sizeof(header->bind);
 193   header->bind.max_tsize = MaxTransmissionSize;
 194   header->bind.max_rsize = MaxReceiveSize;
 195   header->bind.assoc_gid = AssocGroupId;
 196   header->bind.num_elements = 1;
 197   header->bind.num_syntaxes = 1;
 198   memcpy(&header->bind.abstract, AbstractId, sizeof(RPC_SYNTAX_IDENTIFIER));
 199   memcpy(&header->bind.transfer, TransferId, sizeof(RPC_SYNTAX_IDENTIFIER));
 200
 201   return header;
 202 }
 203
 204 static RpcPktHdr *RPCRT4_BuildAuthHeader(unsigned long DataRepresentation)
 205 {
 206   RpcPktHdr *header;
 207
 208   header = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
 209                      sizeof(header->common) + 12);
 210   if (header == NULL)
 211     return NULL;
 212
 213   RPCRT4_BuildCommonHeader(header, PKT_AUTH3, DataRepresentation);
 214   header->common.frag_len = 0x14;
 215   header->common.auth_len = 0;
 216
 217   return header;
 218 }
 219
 220 RpcPktHdr *RPCRT4_BuildBindNackHeader(unsigned long DataRepresentation,
 221                                       unsigned char RpcVersion,
 222                                       unsigned char RpcVersionMinor)
 223 {
 224   RpcPktHdr *header;
 225
 226   header = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(header->bind_nack));
 227   if (header == NULL) {
 228     return NULL;
 229   }
 230
 231   RPCRT4_BuildCommonHeader(header, PKT_BIND_NACK, DataRepresentation);
 232   header->common.frag_len = sizeof(header->bind_nack);
 233   header->bind_nack.reject_reason = REJECT_REASON_NOT_SPECIFIED;
 234   header->bind_nack.protocols_count = 1;
 235   header->bind_nack.protocols[0].rpc_ver = RpcVersion;
 236   header->bind_nack.protocols[0].rpc_ver_minor = RpcVersionMinor;
 237
 238   return header;
 239 }
 240
 241 RpcPktHdr *RPCRT4_BuildBindAckHeader(unsigned long DataRepresentation,
 242                                      unsigned short MaxTransmissionSize,
 243                                      unsigned short MaxReceiveSize,
 244                                      LPCSTR ServerAddress,
 245                                      unsigned long Result,
 246                                      unsigned long Reason,
 247                                      const RPC_SYNTAX_IDENTIFIER *TransferId)
 248 {
 249   RpcPktHdr *header;
 250   unsigned long header_size;
 251   RpcAddressString *server_address;
 252   RpcResults *results;
 253   RPC_SYNTAX_IDENTIFIER *transfer_id;
 254
 255   header_size = sizeof(header->bind_ack) +
 256                 ROUND_UP(FIELD_OFFSET(RpcAddressString, string[strlen(ServerAddress) + 1]), 4) +
 257                 sizeof(RpcResults) +
 258                 sizeof(RPC_SYNTAX_IDENTIFIER);
 259
 260   header = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, header_size);
 261   if (header == NULL) {
 262     return NULL;
 263   }
 264
 265   RPCRT4_BuildCommonHeader(header, PKT_BIND_ACK, DataRepresentation);
 266   header->common.frag_len = header_size;
 267   header->bind_ack.max_tsize = MaxTransmissionSize;
 268   header->bind_ack.max_rsize = MaxReceiveSize;
 269   server_address = (RpcAddressString*)(&header->bind_ack + 1);
 270   server_address->length = strlen(ServerAddress) + 1;
 271   strcpy(server_address->string, ServerAddress);
 272   /* results is 4-byte aligned */
 273   results = (RpcResults*)((ULONG_PTR)server_address + ROUND_UP(FIELD_OFFSET(RpcAddressString, string[server_address->length]), 4));
 274   results->num_results = 1;
 275   results->results[0].result = Result;
 276   results->results[0].reason = Reason;
 277   transfer_id = (RPC_SYNTAX_IDENTIFIER*)(results + 1);
 278   memcpy(transfer_id, TransferId, sizeof(RPC_SYNTAX_IDENTIFIER));
 279
 280   return header;
 281 }
 282
 283 VOID RPCRT4_FreeHeader(RpcPktHdr *Header)
 284 {
 285   HeapFree(GetProcessHeap(), 0, Header);
 286 }
 287
 288 NCA_STATUS RPC2NCA_STATUS(RPC_STATUS status)
 289 {
 290     switch (status)
 291     {
 292     case ERROR_INVALID_HANDLE:              return NCA_S_FAULT_CONTEXT_MISMATCH;
 293     case ERROR_OUTOFMEMORY:                 return NCA_S_FAULT_REMOTE_NO_MEMORY;
 294     case RPC_S_NOT_LISTENING:               return NCA_S_SERVER_TOO_BUSY;
 295     case RPC_S_UNKNOWN_IF:                  return NCA_S_UNK_IF;
 296     case RPC_S_SERVER_TOO_BUSY:             return NCA_S_SERVER_TOO_BUSY;
 297     case RPC_S_CALL_FAILED:                 return NCA_S_FAULT_UNSPEC;
 298     case RPC_S_CALL_FAILED_DNE:             return NCA_S_MANAGER_NOT_ENTERED;
 299     case RPC_S_PROTOCOL_ERROR:              return NCA_S_PROTO_ERROR;
 300     case RPC_S_UNSUPPORTED_TYPE:            return NCA_S_UNSUPPORTED_TYPE;
 301     case RPC_S_INVALID_TAG:                 return NCA_S_FAULT_INVALID_TAG;
 302     case RPC_S_INVALID_BOUND:               return NCA_S_FAULT_INVALID_BOUND;
 303     case RPC_S_PROCNUM_OUT_OF_RANGE:        return NCA_S_OP_RNG_ERROR;
 304     case RPC_X_SS_HANDLES_MISMATCH:         return NCA_S_FAULT_CONTEXT_MISMATCH;
 305     case RPC_S_CALL_CANCELLED:              return NCA_S_FAULT_CANCEL;
 306     case RPC_S_COMM_FAILURE:                return NCA_S_COMM_FAILURE;
 307     case RPC_X_WRONG_PIPE_ORDER:            return NCA_S_FAULT_PIPE_ORDER;
 308     case RPC_X_PIPE_CLOSED:                 return NCA_S_FAULT_PIPE_CLOSED;
 309     case RPC_X_PIPE_DISCIPLINE_ERROR:       return NCA_S_FAULT_PIPE_DISCIPLINE;
 310     case RPC_X_PIPE_EMPTY:                  return NCA_S_FAULT_PIPE_EMPTY;
 311     case STATUS_FLOAT_DIVIDE_BY_ZERO:       return NCA_S_FAULT_FP_DIV_ZERO;
 312     case STATUS_FLOAT_INVALID_OPERATION:    return NCA_S_FAULT_FP_ERROR;
 313     case STATUS_FLOAT_OVERFLOW:             return NCA_S_FAULT_FP_OVERFLOW;
 314     case STATUS_FLOAT_UNDERFLOW:            return NCA_S_FAULT_FP_UNDERFLOW;
 315     case STATUS_INTEGER_DIVIDE_BY_ZERO:     return NCA_S_FAULT_INT_DIV_BY_ZERO;
 316     case STATUS_INTEGER_OVERFLOW:           return NCA_S_FAULT_INT_OVERFLOW;
 317     default:                                return status;
 318     }
 319 }
 320
 321 RPC_STATUS NCA2RPC_STATUS(NCA_STATUS status)
 322 {
 323     switch (status)
 324     {
 325     case NCA_S_COMM_FAILURE:            return RPC_S_COMM_FAILURE;
 326     case NCA_S_OP_RNG_ERROR:            return RPC_S_PROCNUM_OUT_OF_RANGE;
 327     case NCA_S_UNK_IF:                  return RPC_S_UNKNOWN_IF;
 328     case NCA_S_YOU_CRASHED:             return RPC_S_CALL_FAILED;
 329     case NCA_S_PROTO_ERROR:             return RPC_S_PROTOCOL_ERROR;
 330     case NCA_S_OUT_ARGS_TOO_BIG:        return ERROR_NOT_ENOUGH_SERVER_MEMORY;
 331     case NCA_S_SERVER_TOO_BUSY:         return RPC_S_SERVER_TOO_BUSY;
 332     case NCA_S_UNSUPPORTED_TYPE:        return RPC_S_UNSUPPORTED_TYPE;
 333     case NCA_S_FAULT_INT_DIV_BY_ZERO:   return RPC_S_ZERO_DIVIDE;
 334     case NCA_S_FAULT_ADDR_ERROR:        return RPC_S_ADDRESS_ERROR;
 335     case NCA_S_FAULT_FP_DIV_ZERO:       return RPC_S_FP_DIV_ZERO;
 336     case NCA_S_FAULT_FP_UNDERFLOW:      return RPC_S_FP_UNDERFLOW;
 337     case NCA_S_FAULT_FP_OVERFLOW:       return RPC_S_FP_OVERFLOW;
 338     case NCA_S_FAULT_INVALID_TAG:       return RPC_S_INVALID_TAG;
 339     case NCA_S_FAULT_INVALID_BOUND:     return RPC_S_INVALID_BOUND;
 340     case NCA_S_RPC_VERSION_MISMATCH:    return RPC_S_PROTOCOL_ERROR;
 341     case NCA_S_UNSPEC_REJECT:           return RPC_S_CALL_FAILED_DNE;
 342     case NCA_S_BAD_ACTID:               return RPC_S_CALL_FAILED_DNE;
 343     case NCA_S_WHO_ARE_YOU_FAILED:      return RPC_S_CALL_FAILED;
 344     case NCA_S_MANAGER_NOT_ENTERED:     return RPC_S_CALL_FAILED_DNE;
 345     case NCA_S_FAULT_CANCEL:            return RPC_S_CALL_CANCELLED;
 346     case NCA_S_FAULT_ILL_INST:          return RPC_S_ADDRESS_ERROR;
 347     case NCA_S_FAULT_FP_ERROR:          return RPC_S_FP_OVERFLOW;
 348     case NCA_S_FAULT_INT_OVERFLOW:      return RPC_S_ADDRESS_ERROR;
 349     case NCA_S_FAULT_UNSPEC:            return RPC_S_CALL_FAILED;
 350     case NCA_S_FAULT_PIPE_EMPTY:        return RPC_X_PIPE_EMPTY;
 351     case NCA_S_FAULT_PIPE_CLOSED:       return RPC_X_PIPE_CLOSED;
 352     case NCA_S_FAULT_PIPE_ORDER:        return RPC_X_WRONG_PIPE_ORDER;
 353     case NCA_S_FAULT_PIPE_DISCIPLINE:   return RPC_X_PIPE_DISCIPLINE_ERROR;
 354     case NCA_S_FAULT_PIPE_COMM_ERROR:   return RPC_S_COMM_FAILURE;
 355     case NCA_S_FAULT_PIPE_MEMORY:       return ERROR_OUTOFMEMORY;
 356     case NCA_S_FAULT_CONTEXT_MISMATCH:  return ERROR_INVALID_HANDLE;
 357     case NCA_S_FAULT_REMOTE_NO_MEMORY:  return ERROR_NOT_ENOUGH_SERVER_MEMORY;
 358     default:                            return status;
 359     }
 360 }
 361
 362 static RPC_STATUS RPCRT4_SecurePacket(RpcConnection *Connection,
 363     enum secure_packet_direction dir,
 364     RpcPktHdr *hdr, unsigned int hdr_size,
 365     unsigned char *stub_data, unsigned int stub_data_size,
 366     RpcAuthVerifier *auth_hdr,
 367     unsigned char *auth_value, unsigned int auth_value_size)
 368 {
 369     SecBufferDesc message;
 370     SecBuffer buffers[4];
 371     SECURITY_STATUS sec_status;
 372
 373     message.ulVersion = SECBUFFER_VERSION;
 374     message.cBuffers = sizeof(buffers)/sizeof(buffers[0]);
 375     message.pBuffers = buffers;
 376
 377     buffers[0].cbBuffer = hdr_size;
 378     buffers[0].BufferType = SECBUFFER_DATA|SECBUFFER_READONLY_WITH_CHECKSUM;
 379     buffers[0].pvBuffer = hdr;
 380     buffers[1].cbBuffer = stub_data_size;
 381     buffers[1].BufferType = SECBUFFER_DATA;
 382     buffers[1].pvBuffer = stub_data;
 383     buffers[2].cbBuffer = sizeof(*auth_hdr);
 384     buffers[2].BufferType = SECBUFFER_DATA|SECBUFFER_READONLY_WITH_CHECKSUM;
 385     buffers[2].pvBuffer = auth_hdr;
 386     buffers[3].cbBuffer = auth_value_size;
 387     buffers[3].BufferType = SECBUFFER_TOKEN;
 388     buffers[3].pvBuffer = auth_value;
 389
 390     if (dir == SECURE_PACKET_SEND)
 391     {
 392         if ((auth_hdr->auth_level == RPC_C_AUTHN_LEVEL_PKT_PRIVACY) && packet_has_body(hdr))
 393         {
 394             sec_status = EncryptMessage(&Connection->ctx, 0, &message, 0 /* FIXME */);
 395             if (sec_status != SEC_E_OK)
 396             {
 397                 ERR("EncryptMessage failed with 0x%08x\n", sec_status);
 398                 return RPC_S_SEC_PKG_ERROR;
 399             }
 400         }
 401         else if (auth_hdr->auth_level != RPC_C_AUTHN_LEVEL_NONE)
 402         {
 403             sec_status = MakeSignature(&Connection->ctx, 0, &message, 0 /* FIXME */);
 404             if (sec_status != SEC_E_OK)
 405             {
 406                 ERR("MakeSignature failed with 0x%08x\n", sec_status);
 407                 return RPC_S_SEC_PKG_ERROR;
 408             }
 409         }
 410     }
 411     else if (dir == SECURE_PACKET_RECEIVE)
 412     {
 413         if ((auth_hdr->auth_level == RPC_C_AUTHN_LEVEL_PKT_PRIVACY) && packet_has_body(hdr))
 414         {
 415             sec_status = DecryptMessage(&Connection->ctx, &message, 0 /* FIXME */, 0);
 416             if (sec_status != SEC_E_OK)
 417             {
 418                 ERR("EncryptMessage failed with 0x%08x\n", sec_status);
 419                 return RPC_S_SEC_PKG_ERROR;
 420             }
 421         }
 422         else if (auth_hdr->auth_level != RPC_C_AUTHN_LEVEL_NONE)
 423         {
 424             sec_status = VerifySignature(&Connection->ctx, &message, 0 /* FIXME */, NULL);
 425             if (sec_status != SEC_E_OK)
 426             {
 427                 ERR("VerifySignature failed with 0x%08x\n", sec_status);
 428                 return RPC_S_SEC_PKG_ERROR;
 429             }
 430         }
 431     }
 432
 433     return RPC_S_OK;
 434 }
 435
 436 /***********************************************************************
 437  *           RPCRT4_SendAuth (internal)
 438  *
 439  * Transmit a packet with authorization data over connection in acceptable fragments.
 440  */
 441 static RPC_STATUS RPCRT4_SendAuth(RpcConnection *Connection, RpcPktHdr *Header,
 442                                   void *Buffer, unsigned int BufferLength,
 443                                   const void *Auth, unsigned int AuthLength)
 444 {
 445   PUCHAR buffer_pos;
 446   DWORD hdr_size;
 447   LONG count;
 448   unsigned char *pkt;
 449   LONG alen;
 450   RPC_STATUS status;
 451
 452   buffer_pos = Buffer;
 453   /* The packet building functions save the packet header size, so we can use it. */
 454   hdr_size = Header->common.frag_len;
 455   if (AuthLength)
 456     Header->common.auth_len = AuthLength;
 457   else if (Connection->AuthInfo && packet_has_auth_verifier(Header))
 458   {
 459     if ((Connection->AuthInfo->AuthnLevel == RPC_C_AUTHN_LEVEL_PKT_PRIVACY) && packet_has_body(Header))
 460       Header->common.auth_len = Connection->encryption_auth_len;
 461     else
 462       Header->common.auth_len = Connection->signature_auth_len;
 463   }
 464   else
 465     Header->common.auth_len = 0;
 466   Header->common.flags |= RPC_FLG_FIRST;
 467   Header->common.flags &= ~RPC_FLG_LAST;
 468
 469   alen = RPC_AUTH_VERIFIER_LEN(&Header->common);
 470
 471   while (!(Header->common.flags & RPC_FLG_LAST)) {
 472     unsigned char auth_pad_len = Header->common.auth_len ? ROUND_UP_AMOUNT(BufferLength, AUTH_ALIGNMENT) : 0;
 473     unsigned int pkt_size = BufferLength + hdr_size + alen + auth_pad_len;
 474
 475     /* decide if we need to split the packet into fragments */
 476    if (pkt_size <= Connection->MaxTransmissionSize) {
 477      Header->common.flags |= RPC_FLG_LAST;
 478      Header->common.frag_len = pkt_size;
 479     } else {
 480       auth_pad_len = 0;
 481       /* make sure packet payload will be a multiple of 16 */
 482       Header->common.frag_len =
 483         ((Connection->MaxTransmissionSize - hdr_size - alen) & ~(AUTH_ALIGNMENT-1)) +
 484         hdr_size + alen;
 485     }
 486
 487     pkt = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, Header->common.frag_len);
 488
 489     memcpy(pkt, Header, hdr_size);
 490
 491     /* fragment consisted of header only and is the last one */
 492     if (hdr_size == Header->common.frag_len)
 493       goto write;
 494
 495     memcpy(pkt + hdr_size, buffer_pos, Header->common.frag_len - hdr_size - auth_pad_len - alen);
 496
 497     /* add the authorization info */
 498     if (Connection->AuthInfo && packet_has_auth_verifier(Header))
 499     {
 500       RpcAuthVerifier *auth_hdr = (RpcAuthVerifier *)&pkt[Header->common.frag_len - alen];
 501
 502       auth_hdr->auth_type = Connection->AuthInfo->AuthnSvc;
 503       auth_hdr->auth_level = Connection->AuthInfo->AuthnLevel;
 504       auth_hdr->auth_pad_length = auth_pad_len;
 505       auth_hdr->auth_reserved = 0;
 506       /* a unique number... */
 507       auth_hdr->auth_context_id = (unsigned long)Connection;
 508
 509       if (AuthLength)
 510         memcpy(auth_hdr + 1, Auth, AuthLength);
 511       else
 512       {
 513         status = RPCRT4_SecurePacket(Connection, SECURE_PACKET_SEND,
 514             (RpcPktHdr *)pkt, hdr_size,
 515             pkt + hdr_size, Header->common.frag_len - hdr_size - alen,
 516             auth_hdr,
 517             (unsigned char *)(auth_hdr + 1), Header->common.auth_len);
 518         if (status != RPC_S_OK)
 519         {
 520           HeapFree(GetProcessHeap(), 0, pkt);
 521           return status;
 522         }
 523       }
 524     }
 525
 526 write:
 527     count = rpcrt4_conn_write(Connection, pkt, Header->common.frag_len);
 528     HeapFree(GetProcessHeap(), 0, pkt);
 529     if (count<0) {
 530       WARN("rpcrt4_conn_write failed (auth)\n");
 531       return RPC_S_PROTOCOL_ERROR;
 532     }
 533
 534     buffer_pos += Header->common.frag_len - hdr_size - alen - auth_pad_len;
 535     BufferLength -= Header->common.frag_len - hdr_size - alen - auth_pad_len;
 536     Header->common.flags &= ~RPC_FLG_FIRST;
 537   }
 538
 539   return RPC_S_OK;
 540 }
 541
 542 /***********************************************************************
 543  *           RPCRT4_ClientAuthorize (internal)
 544  *
 545  * Authorize a client connection. A NULL in param signifies a new connection.
 546  */
 547 static RPC_STATUS RPCRT4_ClientAuthorize(RpcConnection *conn, SecBuffer *in,
 548                                          SecBuffer *out)
 549 {
 550   SECURITY_STATUS r;
 551   SecBufferDesc out_desc;
 552   SecBufferDesc inp_desc;
 553   SecPkgContext_Sizes secctx_sizes;
 554   BOOL continue_needed;
 555   ULONG context_req = ISC_REQ_CONNECTION | ISC_REQ_USE_DCE_STYLE |
 556                       ISC_REQ_MUTUAL_AUTH | ISC_REQ_DELEGATE;
 557
 558   if (conn->AuthInfo->AuthnLevel == RPC_C_AUTHN_LEVEL_PKT_INTEGRITY)
 559     context_req |= ISC_REQ_INTEGRITY;
 560   else if (conn->AuthInfo->AuthnLevel == RPC_C_AUTHN_LEVEL_PKT_PRIVACY)
 561     context_req |= ISC_REQ_CONFIDENTIALITY | ISC_REQ_INTEGRITY;
 562
 563   out->BufferType = SECBUFFER_TOKEN;
 564   out->cbBuffer = conn->AuthInfo->cbMaxToken;
 565   out->pvBuffer = HeapAlloc(GetProcessHeap(), 0, out->cbBuffer);
 566   if (!out->pvBuffer) return ERROR_OUTOFMEMORY;
 567
 568   out_desc.ulVersion = 0;
 569   out_desc.cBuffers = 1;
 570   out_desc.pBuffers = out;
 571
 572   inp_desc.cBuffers = 1;
 573   inp_desc.pBuffers = in;
 574   inp_desc.ulVersion = 0;
 575
 576   r = InitializeSecurityContextA(&conn->AuthInfo->cred, in ? &conn->ctx : NULL,
 577         NULL, context_req, 0, SECURITY_NETWORK_DREP,
 578         in ? &inp_desc : NULL, 0, &conn->ctx, &out_desc, &conn->attr,
 579         &conn->exp);
 580   if (FAILED(r))
 581   {
 582       WARN("InitializeSecurityContext failed with error 0x%08x\n", r);
 583       goto failed;
 584   }
 585
 586   TRACE("r = 0x%08x, attr = 0x%08x\n", r, conn->attr);
 587   continue_needed = ((r == SEC_I_CONTINUE_NEEDED) ||
 588                      (r == SEC_I_COMPLETE_AND_CONTINUE));
 589
 590   if ((r == SEC_I_COMPLETE_NEEDED) || (r == SEC_I_COMPLETE_AND_CONTINUE))
 591   {
 592       TRACE("complete needed\n");
 593       r = CompleteAuthToken(&conn->ctx, &out_desc);
 594       if (FAILED(r))
 595       {
 596           WARN("CompleteAuthToken failed with error 0x%08x\n", r);
 597           goto failed;
 598       }
 599   }
 600
 601   TRACE("cbBuffer = %ld\n", out->cbBuffer);
 602
 603   if (!continue_needed)
 604   {
 605       r = QueryContextAttributesA(&conn->ctx, SECPKG_ATTR_SIZES, &secctx_sizes);
 606       if (FAILED(r))
 607       {
 608           WARN("QueryContextAttributes failed with error 0x%08x\n", r);
 609           goto failed;
 610       }
 611       conn->signature_auth_len = secctx_sizes.cbMaxSignature;
 612       conn->encryption_auth_len = secctx_sizes.cbSecurityTrailer;
 613   }
 614
 615   return RPC_S_OK;
 616
 617 failed:
 618   HeapFree(GetProcessHeap(), 0, out->pvBuffer);
 619   out->pvBuffer = NULL;
 620   return ERROR_ACCESS_DENIED; /* FIXME: is this correct? */
 621 }
 622
 623 /***********************************************************************
 624  *           RPCRT4_AuthorizeBinding (internal)
 625  */
 626 static RPC_STATUS RPCRT_AuthorizeConnection(RpcConnection* conn,
 627                                             BYTE *challenge, ULONG count)
 628 {
 629   SecBuffer inp, out;
 630   RpcPktHdr *resp_hdr;
 631   RPC_STATUS status;
 632
 633   TRACE("challenge %s, %d bytes\n", challenge, count);
 634
 635   inp.BufferType = SECBUFFER_TOKEN;
 636   inp.pvBuffer = challenge;
 637   inp.cbBuffer = count;
 638
 639   status = RPCRT4_ClientAuthorize(conn, &inp, &out);
 640   if (status) return status;
 641
 642   resp_hdr = RPCRT4_BuildAuthHeader(NDR_LOCAL_DATA_REPRESENTATION);
 643   if (!resp_hdr)
 644     return E_OUTOFMEMORY;
 645
 646   status = RPCRT4_SendAuth(conn, resp_hdr, NULL, 0, out.pvBuffer, out.cbBuffer);
 647
 648   HeapFree(GetProcessHeap(), 0, out.pvBuffer);
 649   RPCRT4_FreeHeader(resp_hdr);
 650
 651   return status;
 652 }
 653
 654 /***********************************************************************
 655  *           RPCRT4_Send (internal)
 656  *
 657  * Transmit a packet over connection in acceptable fragments.
 658  */
 659 RPC_STATUS RPCRT4_Send(RpcConnection *Connection, RpcPktHdr *Header,
 660                        void *Buffer, unsigned int BufferLength)
 661 {
 662   RPC_STATUS r;
 663   SecBuffer out;
 664
 665   if (!Connection->AuthInfo || SecIsValidHandle(&Connection->ctx))
 666   {
 667     return RPCRT4_SendAuth(Connection, Header, Buffer, BufferLength, NULL, 0);
 668   }
 669
 670   /* tack on a negotiate packet */
 671   RPCRT4_ClientAuthorize(Connection, NULL, &out);
 672   r = RPCRT4_SendAuth(Connection, Header, Buffer, BufferLength, out.pvBuffer, out.cbBuffer);
 673   HeapFree(GetProcessHeap(), 0, out.pvBuffer);
 674
 675   return r;
 676 }
 677
 678 /***********************************************************************
 679  *           RPCRT4_Receive (internal)
 680  *
 681  * Receive a packet from connection and merge the fragments.
 682  */
 683 RPC_STATUS RPCRT4_Receive(RpcConnection *Connection, RpcPktHdr **Header,
 684                           PRPC_MESSAGE pMsg)
 685 {
 686   RPC_STATUS status;
 687   DWORD hdr_length;
 688   LONG dwRead;
 689   unsigned short first_flag;
 690   unsigned long data_length;
 691   unsigned long buffer_length;
 692   unsigned long auth_length;
 693   unsigned char *auth_data = NULL;
 694   RpcPktCommonHdr common_hdr;
 695
 696   *Header = NULL;
 697
 698   TRACE("(%p, %p, %p)\n", Connection, Header, pMsg);
 699
 700   /* read packet common header */
 701   dwRead = rpcrt4_conn_read(Connection, &common_hdr, sizeof(common_hdr));
 702   if (dwRead != sizeof(common_hdr)) {
 703     WARN("Short read of header, %d bytes\n", dwRead);
 704     status = RPC_S_PROTOCOL_ERROR;
 705     goto fail;
 706   }
 707
 708   /* verify if the header really makes sense */
 709   if (common_hdr.rpc_ver != RPC_VER_MAJOR ||
 710       common_hdr.rpc_ver_minor != RPC_VER_MINOR) {
 711     WARN("unhandled packet version\n");
 712     status = RPC_S_PROTOCOL_ERROR;
 713     goto fail;
 714   }
 715
 716   hdr_length = RPCRT4_GetHeaderSize((RpcPktHdr*)&common_hdr);
 717   if (hdr_length == 0) {
 718     WARN("header length == 0\n");
 719     status = RPC_S_PROTOCOL_ERROR;
 720     goto fail;
 721   }
 722
 723   *Header = HeapAlloc(GetProcessHeap(), 0, hdr_length);
 724   memcpy(*Header, &common_hdr, sizeof(common_hdr));
 725
 726   /* read the rest of packet header */
 727   dwRead = rpcrt4_conn_read(Connection, &(*Header)->common + 1, hdr_length - sizeof(common_hdr));
 728   if (dwRead != hdr_length - sizeof(common_hdr)) {
 729     WARN("bad header length, %d bytes, hdr_length %d\n", dwRead, hdr_length);
 730     status = RPC_S_PROTOCOL_ERROR;
 731     goto fail;
 732   }
 733
 734   /* read packet body */
 735   switch (common_hdr.ptype) {
 736   case PKT_RESPONSE:
 737     pMsg->BufferLength = (*Header)->response.alloc_hint;
 738     break;
 739   case PKT_REQUEST:
 740     pMsg->BufferLength = (*Header)->request.alloc_hint;
 741     break;
 742   default:
 743     pMsg->BufferLength = common_hdr.frag_len - hdr_length - RPC_AUTH_VERIFIER_LEN(&common_hdr);
 744   }
 745
 746   TRACE("buffer length = %u\n", pMsg->BufferLength);
 747
 748   status = I_RpcGetBuffer(pMsg);
 749   if (status != RPC_S_OK) goto fail;
 750
 751   first_flag = RPC_FLG_FIRST;
 752   auth_length = common_hdr.auth_len;
 753   if (auth_length) {
 754     auth_data = HeapAlloc(GetProcessHeap(), 0, RPC_AUTH_VERIFIER_LEN(&common_hdr));
 755     if (!auth_data) {
 756       status = RPC_S_PROTOCOL_ERROR;
 757       goto fail;
 758     }
 759   }
 760   buffer_length = 0;
 761   while (TRUE)
 762   {
 763     unsigned int header_auth_len = RPC_AUTH_VERIFIER_LEN(&(*Header)->common);
 764
 765     /* verify header fields */
 766
 767     if (((*Header)->common.frag_len < hdr_length) ||
 768         ((*Header)->common.frag_len - hdr_length < header_auth_len)) {
 769       WARN("frag_len %d too small for hdr_length %d and auth_len %d\n",
 770         (*Header)->common.frag_len, hdr_length, header_auth_len);
 771       status = RPC_S_PROTOCOL_ERROR;
 772       goto fail;
 773     }
 774
 775     if ((*Header)->common.auth_len != auth_length) {
 776       WARN("auth_len header field changed from %ld to %d\n",
 777         auth_length, (*Header)->common.auth_len);
 778       status = RPC_S_PROTOCOL_ERROR;
 779       goto fail;
 780     }
 781
 782     if (((*Header)->common.flags & RPC_FLG_FIRST) != first_flag) {
 783       TRACE("invalid packet flags\n");
 784       status = RPC_S_PROTOCOL_ERROR;
 785       goto fail;
 786     }
 787
 788     data_length = (*Header)->common.frag_len - hdr_length - header_auth_len;
 789     if (data_length + buffer_length > pMsg->BufferLength) {
 790       TRACE("allocation hint exceeded, new buffer length = %ld\n",
 791         data_length + buffer_length);
 792       pMsg->BufferLength = data_length + buffer_length;
 793       status = I_RpcReAllocateBuffer(pMsg);
 794       if (status != RPC_S_OK) goto fail;
 795     }
 796
 797     if (data_length == 0) dwRead = 0; else
 798     dwRead = rpcrt4_conn_read(Connection,
 799         (unsigned char *)pMsg->Buffer + buffer_length, data_length);
 800     if (dwRead != data_length) {
 801       WARN("bad data length, %d/%ld\n", dwRead, data_length);
 802       status = RPC_S_PROTOCOL_ERROR;
 803       goto fail;
 804     }
 805
 806     if (header_auth_len) {
 807       if (header_auth_len < sizeof(RpcAuthVerifier)) {
 808         WARN("bad auth verifier length %d\n", header_auth_len);
 809         status = RPC_S_PROTOCOL_ERROR;
 810         goto fail;
 811       }
 812
 813       /* FIXME: we should accumulate authentication data for the bind,
 814        * bind_ack, alter_context and alter_context_response if necessary.
 815        * however, the details of how this is done is very sketchy in the
 816        * DCE/RPC spec. for all other packet types that have authentication
 817        * verifier data then it is just duplicated in all the fragments */
 818       dwRead = rpcrt4_conn_read(Connection, auth_data, header_auth_len);
 819       if (dwRead != header_auth_len) {
 820         WARN("bad authentication data length, %d/%d\n", dwRead,
 821           header_auth_len);
 822         status = RPC_S_PROTOCOL_ERROR;
 823         goto fail;
 824       }
 825
 826       /* these packets are handled specially, not by the generic SecurePacket
 827        * function */
 828       if ((common_hdr.ptype != PKT_BIND) &&
 829           (common_hdr.ptype != PKT_BIND_ACK) &&
 830           (common_hdr.ptype != PKT_AUTH3))
 831         status = RPCRT4_SecurePacket(Connection, SECURE_PACKET_RECEIVE,
 832             *Header, hdr_length,
 833             (unsigned char *)pMsg->Buffer + buffer_length, data_length,
 834             (RpcAuthVerifier *)auth_data,
 835             (unsigned char *)auth_data + sizeof(RpcAuthVerifier),
 836             header_auth_len - sizeof(RpcAuthVerifier));
 837     }
 838
 839     buffer_length += data_length;
 840     if (!((*Header)->common.flags & RPC_FLG_LAST)) {
 841       TRACE("next header\n");
 842
 843       /* read the header of next packet */
 844       dwRead = rpcrt4_conn_read(Connection, *Header, hdr_length);
 845       if (dwRead != hdr_length) {
 846         WARN("invalid packet header size (%d)\n", dwRead);
 847         status = RPC_S_PROTOCOL_ERROR;
 848         goto fail;
 849       }
 850
 851       first_flag = 0;
 852     } else {
 853       break;
 854     }
 855   }
 856   pMsg->BufferLength = buffer_length;
 857
 858   /* respond to authorization request */
 859   if (common_hdr.ptype == PKT_BIND_ACK && auth_length > sizeof(RpcAuthVerifier))
 860   {
 861     status = RPCRT_AuthorizeConnection(Connection,
 862                                        auth_data + sizeof(RpcAuthVerifier),
 863                                        auth_length);
 864     if (status)
 865         goto fail;
 866   }
 867
 868   /* success */
 869   status = RPC_S_OK;
 870
 871 fail:
 872   if (status != RPC_S_OK) {
 873     RPCRT4_FreeHeader(*Header);
 874     *Header = NULL;
 875   }
 876   HeapFree(GetProcessHeap(), 0, auth_data);
 877   return status;
 878 }
 879
 880 /***********************************************************************
 881  *           I_RpcGetBuffer [RPCRT4.@]
 882  *
 883  * Allocates a buffer for use by I_RpcSend or I_RpcSendReceive and binds to the
 884  * server interface.
 885  *
 886  * PARAMS
 887  *  pMsg [I/O] RPC message information.
 888  *
 889  * RETURNS
 890  *  Success: RPC_S_OK.
 891  *  Failure: RPC_S_INVALID_BINDING if pMsg->Handle is invalid.
 892  *           RPC_S_SERVER_UNAVAILABLE if unable to connect to server.
 893  *           ERROR_OUTOFMEMORY if buffer allocation failed.
 894  *
 895  * NOTES
 896  *  The pMsg->BufferLength field determines the size of the buffer to allocate,
 897  *  in bytes.
 898  *
 899  *  Use I_RpcFreeBuffer() to unbind from the server and free the message buffer.
 900  *
 901  * SEE ALSO
 902  *  I_RpcFreeBuffer(), I_RpcSend(), I_RpcReceive(), I_RpcSendReceive().
 903  */
 904 RPC_STATUS WINAPI I_RpcGetBuffer(PRPC_MESSAGE pMsg)
 905 {
 906   TRACE("(%p): BufferLength=%d\n", pMsg, pMsg->BufferLength);
 907   /* FIXME: pfnAllocate? */
 908   pMsg->Buffer = HeapAlloc(GetProcessHeap(), 0, pMsg->BufferLength);
 909
 910   TRACE("Buffer=%p\n", pMsg->Buffer);
 911   /* FIXME: which errors to return? */
 912   return pMsg->Buffer ? S_OK : E_OUTOFMEMORY;
 913 }
 914
 915 /***********************************************************************
 916  *           I_RpcReAllocateBuffer (internal)
 917  */
 918 static RPC_STATUS I_RpcReAllocateBuffer(PRPC_MESSAGE pMsg)
 919 {
 920   TRACE("(%p): BufferLength=%d\n", pMsg, pMsg->BufferLength);
 921   pMsg->Buffer = HeapReAlloc(GetProcessHeap(), 0, pMsg->Buffer, pMsg->BufferLength);
 922
 923   TRACE("Buffer=%p\n", pMsg->Buffer);
 924   return pMsg->Buffer ? RPC_S_OK : RPC_S_OUT_OF_RESOURCES;
 925 }
 926
 927 /***********************************************************************
 928  *           I_RpcFreeBuffer [RPCRT4.@]
 929  *
 930  * Frees a buffer allocated by I_RpcGetBuffer or I_RpcReceive and unbinds from
 931  * the server interface.
 932  *
 933  * PARAMS
 934  *  pMsg [I/O] RPC message information.
 935  *
 936  * RETURNS
 937  *  RPC_S_OK.
 938  *
 939  * SEE ALSO
 940  *  I_RpcGetBuffer(), I_RpcReceive().
 941  */
 942 RPC_STATUS WINAPI I_RpcFreeBuffer(PRPC_MESSAGE pMsg)
 943 {
 944   TRACE("(%p) Buffer=%p\n", pMsg, pMsg->Buffer);
 945   /* FIXME: pfnFree? */
 946   HeapFree(GetProcessHeap(), 0, pMsg->Buffer);
 947   pMsg->Buffer = NULL;
 948   return S_OK;
 949 }
 950
 951 /***********************************************************************
 952  *           I_RpcSend [RPCRT4.@]
 953  *
 954  * Sends a message to the server.
 955  *
 956  * PARAMS
 957  *  pMsg [I/O] RPC message information.
 958  *
 959  * RETURNS
 960  *  Unknown.
 961  *
 962  * NOTES
 963  *  The buffer must have been allocated with I_RpcGetBuffer().
 964  *
 965  * SEE ALSO
 966  *  I_RpcGetBuffer(), I_RpcReceive(), I_RpcSendReceive().
 967  */
 968 RPC_STATUS WINAPI I_RpcSend(PRPC_MESSAGE pMsg)
 969 {
 970   RpcBinding* bind = (RpcBinding*)pMsg->Handle;
 971   RpcConnection* conn;
 972   RPC_CLIENT_INTERFACE* cif = NULL;
 973   RPC_STATUS status;
 974   RpcPktHdr *hdr;
 975
 976   TRACE("(%p)\n", pMsg);
 977   if (!bind || bind->server) return RPC_S_INVALID_BINDING;
 978
 979   cif = pMsg->RpcInterfaceInformation;
 980   if (!cif) return RPC_S_INTERFACE_NOT_FOUND; /* ? */
 981
 982   if (!bind->Endpoint || !bind->Endpoint[0])
 983   {
 984     TRACE("automatically resolving partially bound binding\n");
 985     status = RpcEpResolveBinding(bind, cif);
 986     if (status != RPC_S_OK) return status;
 987   }
 988
 989   status = RPCRT4_OpenBinding(bind, &conn, &cif->TransferSyntax,
 990                               &cif->InterfaceId);
 991   if (status != RPC_S_OK) return status;
 992
 993   hdr = RPCRT4_BuildRequestHeader(pMsg->DataRepresentation,
 994                                   pMsg->BufferLength, pMsg->ProcNum,
 995                                   &bind->ObjectUuid);
 996   if (!hdr)
 997   {
 998     RPCRT4_CloseBinding(bind, conn);
 999     return ERROR_OUTOFMEMORY;
1000   }
1001   hdr->common.call_id = conn->NextCallId++;
1002
1003   status = RPCRT4_Send(conn, hdr, pMsg->Buffer, pMsg->BufferLength);
1004
1005   RPCRT4_FreeHeader(hdr);
1006
1007   /* save the connection, so the response can be read from it */
1008   pMsg->ReservedForRuntime = conn;
1009   return status;
1010 }
1011
1012 /* is this status something that the server can't recover from? */
1013 static inline BOOL is_hard_error(RPC_STATUS status)
1014 {
1015     switch (status)
1016     {
1017     case 0: /* user-defined fault */
1018     case ERROR_ACCESS_DENIED:
1019     case ERROR_INVALID_PARAMETER:
1020     case RPC_S_PROTOCOL_ERROR:
1021     case RPC_S_CALL_FAILED:
1022     case RPC_S_CALL_FAILED_DNE:
1023     case RPC_S_SEC_PKG_ERROR:
1024         return TRUE;
1025     default:
1026         return FALSE;
1027     }
1028 }
1029
1030 /***********************************************************************
1031  *           I_RpcReceive [RPCRT4.@]
1032  */
1033 RPC_STATUS WINAPI I_RpcReceive(PRPC_MESSAGE pMsg)
1034 {
1035   RpcBinding* bind = (RpcBinding*)pMsg->Handle;
1036   RpcConnection* conn;
1037   RPC_CLIENT_INTERFACE* cif = NULL;
1038   RPC_SERVER_INTERFACE* sif = NULL;
1039   RPC_STATUS status;
1040   RpcPktHdr *hdr = NULL;
1041
1042   TRACE("(%p)\n", pMsg);
1043   if (!bind) return RPC_S_INVALID_BINDING;
1044
1045   if (pMsg->ReservedForRuntime) {
1046     conn = pMsg->ReservedForRuntime;
1047     pMsg->ReservedForRuntime = NULL;
1048   } else {
1049     if (bind->server) {
1050       sif = pMsg->RpcInterfaceInformation;
1051       if (!sif) return RPC_S_INTERFACE_NOT_FOUND; /* ? */
1052       status = RPCRT4_OpenBinding(bind, &conn, &sif->TransferSyntax,
1053                                   &sif->InterfaceId);
1054     } else {
1055       cif = pMsg->RpcInterfaceInformation;
1056       if (!cif) return RPC_S_INTERFACE_NOT_FOUND; /* ? */
1057
1058       if (!bind->Endpoint || !bind->Endpoint[0])
1059       {
1060         TRACE("automatically resolving partially bound binding\n");
1061         status = RpcEpResolveBinding(bind, cif);
1062         if (status != RPC_S_OK) return status;
1063       }
1064
1065       status = RPCRT4_OpenBinding(bind, &conn, &cif->TransferSyntax,
1066                                   &cif->InterfaceId);
1067     }
1068     if (status != RPC_S_OK) return status;
1069   }
1070
1071   status = RPCRT4_Receive(conn, &hdr, pMsg);
1072   if (status != RPC_S_OK) {
1073     WARN("receive failed with error %lx\n", status);
1074     goto fail;
1075   }
1076
1077   switch (hdr->common.ptype) {
1078   case PKT_RESPONSE:
1079     if (bind->server) {
1080         status = RPC_S_PROTOCOL_ERROR;
1081         goto fail;
1082     }
1083     break;
1084   case PKT_REQUEST:
1085     if (!bind->server) {
1086         status = RPC_S_PROTOCOL_ERROR;
1087         goto fail;
1088     }
1089     break;
1090   case PKT_FAULT:
1091     ERR ("we got fault packet with status 0x%lx\n", hdr->fault.status);
1092     status = NCA2RPC_STATUS(hdr->fault.status);
1093     if (is_hard_error(status))
1094         goto fail;
1095     break;
1096   default:
1097     WARN("bad packet type %d\n", hdr->common.ptype);
1098     status = RPC_S_PROTOCOL_ERROR;
1099     goto fail;
1100   }
1101
1102   /* success */
1103   RPCRT4_CloseBinding(bind, conn);
1104   RPCRT4_FreeHeader(hdr);
1105   return status;
1106
1107 fail:
1108   RPCRT4_FreeHeader(hdr);
1109   RPCRT4_DestroyConnection(conn);
1110   return status;
1111 }
1112
1113 /***********************************************************************
1114  *           I_RpcSendReceive [RPCRT4.@]
1115  *
1116  * Sends a message to the server and receives the response.
1117  *
1118  * PARAMS
1119  *  pMsg [I/O] RPC message information.
1120  *
1121  * RETURNS
1122  *  Success: RPC_S_OK.
1123  *  Failure: Any error code.
1124  *
1125  * NOTES
1126  *  The buffer must have been allocated with I_RpcGetBuffer().
1127  *
1128  * SEE ALSO
1129  *  I_RpcGetBuffer(), I_RpcSend(), I_RpcReceive().
1130  */
1131 RPC_STATUS WINAPI I_RpcSendReceive(PRPC_MESSAGE pMsg)
1132 {
1133   RPC_STATUS status;
1134   RPC_MESSAGE original_message;
1135
1136   TRACE("(%p)\n", pMsg);
1137
1138   original_message = *pMsg;
1139   status = I_RpcSend(pMsg);
1140   if (status == RPC_S_OK)
1141     status = I_RpcReceive(pMsg);
1142   /* free the buffer replaced by a new buffer in I_RpcReceive */
1143   if (status == RPC_S_OK)
1144     I_RpcFreeBuffer(&original_message);
1145   return status;
1146 }