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 #include "winuser.h"
  31
  32 #include "rpc.h"
  33 #include "rpcndr.h"
  34 #include "rpcdcep.h"
  35
  36 #include "wine/debug.h"
  37
  38 #include "rpc_binding.h"
  39 #include "rpc_defs.h"
  40 #include "rpc_message.h"
  41 #include "ncastatus.h"
  42
  43 WINE_DEFAULT_DEBUG_CHANNEL(rpc);
  44
  45 /* note: the DCE/RPC spec says the alignment amount should be 4, but
  46  * MS/RPC servers seem to always use 16 */
  47 #define AUTH_ALIGNMENT 16
  48
  49 /* gets the amount needed to round a value up to the specified alignment */
  50 #define ROUND_UP_AMOUNT(value, alignment) \
  51     (((alignment) - (((value) % (alignment)))) % (alignment))
  52 #define ROUND_UP(value, alignment) (((value) + ((alignment) - 1)) & ~((alignment)-1))
  53
  54 enum secure_packet_direction
  55 {
  56   SECURE_PACKET_SEND,
  57   SECURE_PACKET_RECEIVE
  58 };
  59
  60 static RPC_STATUS I_RpcReAllocateBuffer(PRPC_MESSAGE pMsg);
  61
  62 static DWORD RPCRT4_GetHeaderSize(const RpcPktHdr *Header)
  63 {
  64   static const DWORD header_sizes[] = {
  65     sizeof(Header->request), 0, sizeof(Header->response),
  66     sizeof(Header->fault), 0, 0, 0, 0, 0, 0, 0, sizeof(Header->bind),
  67     sizeof(Header->bind_ack), sizeof(Header->bind_nack),
  68     0, 0, 0, 0, 0
  69   };
  70   ULONG ret = 0;
  71
  72   if (Header->common.ptype < sizeof(header_sizes) / sizeof(header_sizes[0])) {
  73     ret = header_sizes[Header->common.ptype];
  74     if (ret == 0)
  75       FIXME("unhandled packet type\n");
  76     if (Header->common.flags & RPC_FLG_OBJECT_UUID)
  77       ret += sizeof(UUID);
  78   } else {
  79     TRACE("invalid packet type\n");
  80   }
  81
  82   return ret;
  83 }
  84
  85 static int packet_has_body(const RpcPktHdr *Header)
  86 {
  87     return (Header->common.ptype == PKT_FAULT) ||
  88            (Header->common.ptype == PKT_REQUEST) ||
  89            (Header->common.ptype == PKT_RESPONSE);
  90 }
  91
  92 static int packet_has_auth_verifier(const RpcPktHdr *Header)
  93 {
  94     return !(Header->common.ptype == PKT_BIND_NACK) &&
  95            !(Header->common.ptype == PKT_SHUTDOWN);
  96 }
  97
  98 static VOID RPCRT4_BuildCommonHeader(RpcPktHdr *Header, unsigned char PacketType,
  99                               unsigned long DataRepresentation)
 100 {
 101   Header->common.rpc_ver = RPC_VER_MAJOR;
 102   Header->common.rpc_ver_minor = RPC_VER_MINOR;
 103   Header->common.ptype = PacketType;
 104   Header->common.drep[0] = LOBYTE(LOWORD(DataRepresentation));
 105   Header->common.drep[1] = HIBYTE(LOWORD(DataRepresentation));
 106   Header->common.drep[2] = LOBYTE(HIWORD(DataRepresentation));
 107   Header->common.drep[3] = HIBYTE(HIWORD(DataRepresentation));
 108   Header->common.auth_len = 0;
 109   Header->common.call_id = 1;
 110   Header->common.flags = 0;
 111   /* Flags and fragment length are computed in RPCRT4_Send. */
 112 }
 113
 114 static RpcPktHdr *RPCRT4_BuildRequestHeader(unsigned long DataRepresentation,
 115                                      unsigned long BufferLength,
 116                                      unsigned short ProcNum,
 117                                      UUID *ObjectUuid)
 118 {
 119   RpcPktHdr *header;
 120   BOOL has_object;
 121   RPC_STATUS status;
 122
 123   has_object = (ObjectUuid != NULL && !UuidIsNil(ObjectUuid, &status));
 124   header = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
 125                      sizeof(header->request) + (has_object ? sizeof(UUID) : 0));
 126   if (header == NULL) {
 127     return NULL;
 128   }
 129
 130   RPCRT4_BuildCommonHeader(header, PKT_REQUEST, DataRepresentation);
 131   header->common.frag_len = sizeof(header->request);
 132   header->request.alloc_hint = BufferLength;
 133   header->request.context_id = 0;
 134   header->request.opnum = ProcNum;
 135   if (has_object) {
 136     header->common.flags |= RPC_FLG_OBJECT_UUID;
 137     header->common.frag_len += sizeof(UUID);
 138     memcpy(&header->request + 1, ObjectUuid, sizeof(UUID));
 139   }
 140
 141   return header;
 142 }
 143
 144 RpcPktHdr *RPCRT4_BuildResponseHeader(unsigned long DataRepresentation,
 145                                       unsigned long BufferLength)
 146 {
 147   RpcPktHdr *header;
 148
 149   header = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(header->response));
 150   if (header == NULL) {
 151     return NULL;
 152   }
 153
 154   RPCRT4_BuildCommonHeader(header, PKT_RESPONSE, DataRepresentation);
 155   header->common.frag_len = sizeof(header->response);
 156   header->response.alloc_hint = BufferLength;
 157
 158   return header;
 159 }
 160
 161 RpcPktHdr *RPCRT4_BuildFaultHeader(unsigned long DataRepresentation,
 162                                    RPC_STATUS Status)
 163 {
 164   RpcPktHdr *header;
 165
 166   header = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(header->fault));
 167   if (header == NULL) {
 168     return NULL;
 169   }
 170
 171   RPCRT4_BuildCommonHeader(header, PKT_FAULT, DataRepresentation);
 172   header->common.frag_len = sizeof(header->fault);
 173   header->fault.status = Status;
 174
 175   return header;
 176 }
 177
 178 RpcPktHdr *RPCRT4_BuildBindHeader(unsigned long DataRepresentation,
 179                                   unsigned short MaxTransmissionSize,
 180                                   unsigned short MaxReceiveSize,
 181                                   unsigned long  AssocGroupId,
 182                                   const RPC_SYNTAX_IDENTIFIER *AbstractId,
 183                                   const RPC_SYNTAX_IDENTIFIER *TransferId)
 184 {
 185   RpcPktHdr *header;
 186
 187   header = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(header->bind));
 188   if (header == NULL) {
 189     return NULL;
 190   }
 191
 192   RPCRT4_BuildCommonHeader(header, PKT_BIND, DataRepresentation);
 193   header->common.frag_len = sizeof(header->bind);
 194   header->bind.max_tsize = MaxTransmissionSize;
 195   header->bind.max_rsize = MaxReceiveSize;
 196   header->bind.assoc_gid = AssocGroupId;
 197   header->bind.num_elements = 1;
 198   header->bind.num_syntaxes = 1;
 199   memcpy(&header->bind.abstract, AbstractId, sizeof(RPC_SYNTAX_IDENTIFIER));
 200   memcpy(&header->bind.transfer, TransferId, sizeof(RPC_SYNTAX_IDENTIFIER));
 201
 202   return header;
 203 }
 204
 205 static RpcPktHdr *RPCRT4_BuildAuthHeader(unsigned long DataRepresentation)
 206 {
 207   RpcPktHdr *header;
 208
 209   header = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
 210                      sizeof(header->common) + 12);
 211   if (header == NULL)
 212     return NULL;
 213
 214   RPCRT4_BuildCommonHeader(header, PKT_AUTH3, DataRepresentation);
 215   header->common.frag_len = 0x14;
 216   header->common.auth_len = 0;
 217
 218   return header;
 219 }
 220
 221 RpcPktHdr *RPCRT4_BuildBindNackHeader(unsigned long DataRepresentation,
 222                                       unsigned char RpcVersion,
 223                                       unsigned char RpcVersionMinor)
 224 {
 225   RpcPktHdr *header;
 226
 227   header = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(header->bind_nack));
 228   if (header == NULL) {
 229     return NULL;
 230   }
 231
 232   RPCRT4_BuildCommonHeader(header, PKT_BIND_NACK, DataRepresentation);
 233   header->common.frag_len = sizeof(header->bind_nack);
 234   header->bind_nack.reject_reason = REJECT_REASON_NOT_SPECIFIED;
 235   header->bind_nack.protocols_count = 1;
 236   header->bind_nack.protocols[0].rpc_ver = RpcVersion;
 237   header->bind_nack.protocols[0].rpc_ver_minor = RpcVersionMinor;
 238
 239   return header;
 240 }
 241
 242 RpcPktHdr *RPCRT4_BuildBindAckHeader(unsigned long DataRepresentation,
 243                                      unsigned short MaxTransmissionSize,
 244                                      unsigned short MaxReceiveSize,
 245                                      unsigned long AssocGroupId,
 246                                      LPCSTR ServerAddress,
 247                                      unsigned long Result,
 248                                      unsigned long Reason,
 249                                      const RPC_SYNTAX_IDENTIFIER *TransferId)
 250 {
 251   RpcPktHdr *header;
 252   unsigned long header_size;
 253   RpcAddressString *server_address;
 254   RpcResults *results;
 255   RPC_SYNTAX_IDENTIFIER *transfer_id;
 256
 257   header_size = sizeof(header->bind_ack) +
 258                 ROUND_UP(FIELD_OFFSET(RpcAddressString, string[strlen(ServerAddress) + 1]), 4) +
 259                 sizeof(RpcResults) +
 260                 sizeof(RPC_SYNTAX_IDENTIFIER);
 261
 262   header = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, header_size);
 263   if (header == NULL) {
 264     return NULL;
 265   }
 266
 267   RPCRT4_BuildCommonHeader(header, PKT_BIND_ACK, DataRepresentation);
 268   header->common.frag_len = header_size;
 269   header->bind_ack.max_tsize = MaxTransmissionSize;
 270   header->bind_ack.max_rsize = MaxReceiveSize;
 271   header->bind_ack.assoc_gid = AssocGroupId;
 272   server_address = (RpcAddressString*)(&header->bind_ack + 1);
 273   server_address->length = strlen(ServerAddress) + 1;
 274   strcpy(server_address->string, ServerAddress);
 275   /* results is 4-byte aligned */
 276   results = (RpcResults*)((ULONG_PTR)server_address + ROUND_UP(FIELD_OFFSET(RpcAddressString, string[server_address->length]), 4));
 277   results->num_results = 1;
 278   results->results[0].result = Result;
 279   results->results[0].reason = Reason;
 280   transfer_id = (RPC_SYNTAX_IDENTIFIER*)(results + 1);
 281   memcpy(transfer_id, TransferId, sizeof(RPC_SYNTAX_IDENTIFIER));
 282
 283   return header;
 284 }
 285
 286 VOID RPCRT4_FreeHeader(RpcPktHdr *Header)
 287 {
 288   HeapFree(GetProcessHeap(), 0, Header);
 289 }
 290
 291 NCA_STATUS RPC2NCA_STATUS(RPC_STATUS status)
 292 {
 293     switch (status)
 294     {
 295     case ERROR_INVALID_HANDLE:              return NCA_S_FAULT_CONTEXT_MISMATCH;
 296     case ERROR_OUTOFMEMORY:                 return NCA_S_FAULT_REMOTE_NO_MEMORY;
 297     case RPC_S_NOT_LISTENING:               return NCA_S_SERVER_TOO_BUSY;
 298     case RPC_S_UNKNOWN_IF:                  return NCA_S_UNK_IF;
 299     case RPC_S_SERVER_TOO_BUSY:             return NCA_S_SERVER_TOO_BUSY;
 300     case RPC_S_CALL_FAILED:                 return NCA_S_FAULT_UNSPEC;
 301     case RPC_S_CALL_FAILED_DNE:             return NCA_S_MANAGER_NOT_ENTERED;
 302     case RPC_S_PROTOCOL_ERROR:              return NCA_S_PROTO_ERROR;
 303     case RPC_S_UNSUPPORTED_TYPE:            return NCA_S_UNSUPPORTED_TYPE;
 304     case RPC_S_INVALID_TAG:                 return NCA_S_FAULT_INVALID_TAG;
 305     case RPC_S_INVALID_BOUND:               return NCA_S_FAULT_INVALID_BOUND;
 306     case RPC_S_PROCNUM_OUT_OF_RANGE:        return NCA_S_OP_RNG_ERROR;
 307     case RPC_X_SS_HANDLES_MISMATCH:         return NCA_S_FAULT_CONTEXT_MISMATCH;
 308     case RPC_S_CALL_CANCELLED:              return NCA_S_FAULT_CANCEL;
 309     case RPC_S_COMM_FAILURE:                return NCA_S_COMM_FAILURE;
 310     case RPC_X_WRONG_PIPE_ORDER:            return NCA_S_FAULT_PIPE_ORDER;
 311     case RPC_X_PIPE_CLOSED:                 return NCA_S_FAULT_PIPE_CLOSED;
 312     case RPC_X_PIPE_DISCIPLINE_ERROR:       return NCA_S_FAULT_PIPE_DISCIPLINE;
 313     case RPC_X_PIPE_EMPTY:                  return NCA_S_FAULT_PIPE_EMPTY;
 314     case STATUS_FLOAT_DIVIDE_BY_ZERO:       return NCA_S_FAULT_FP_DIV_ZERO;
 315     case STATUS_FLOAT_INVALID_OPERATION:    return NCA_S_FAULT_FP_ERROR;
 316     case STATUS_FLOAT_OVERFLOW:             return NCA_S_FAULT_FP_OVERFLOW;
 317     case STATUS_FLOAT_UNDERFLOW:            return NCA_S_FAULT_FP_UNDERFLOW;
 318     case STATUS_INTEGER_DIVIDE_BY_ZERO:     return NCA_S_FAULT_INT_DIV_BY_ZERO;
 319     case STATUS_INTEGER_OVERFLOW:           return NCA_S_FAULT_INT_OVERFLOW;
 320     default:                                return status;
 321     }
 322 }
 323
 324 RPC_STATUS NCA2RPC_STATUS(NCA_STATUS status)
 325 {
 326     switch (status)
 327     {
 328     case NCA_S_COMM_FAILURE:            return RPC_S_COMM_FAILURE;
 329     case NCA_S_OP_RNG_ERROR:            return RPC_S_PROCNUM_OUT_OF_RANGE;
 330     case NCA_S_UNK_IF:                  return RPC_S_UNKNOWN_IF;
 331     case NCA_S_YOU_CRASHED:             return RPC_S_CALL_FAILED;
 332     case NCA_S_PROTO_ERROR:             return RPC_S_PROTOCOL_ERROR;
 333     case NCA_S_OUT_ARGS_TOO_BIG:        return ERROR_NOT_ENOUGH_SERVER_MEMORY;
 334     case NCA_S_SERVER_TOO_BUSY:         return RPC_S_SERVER_TOO_BUSY;
 335     case NCA_S_UNSUPPORTED_TYPE:        return RPC_S_UNSUPPORTED_TYPE;
 336     case NCA_S_FAULT_INT_DIV_BY_ZERO:   return RPC_S_ZERO_DIVIDE;
 337     case NCA_S_FAULT_ADDR_ERROR:        return RPC_S_ADDRESS_ERROR;
 338     case NCA_S_FAULT_FP_DIV_ZERO:       return RPC_S_FP_DIV_ZERO;
 339     case NCA_S_FAULT_FP_UNDERFLOW:      return RPC_S_FP_UNDERFLOW;
 340     case NCA_S_FAULT_FP_OVERFLOW:       return RPC_S_FP_OVERFLOW;
 341     case NCA_S_FAULT_INVALID_TAG:       return RPC_S_INVALID_TAG;
 342     case NCA_S_FAULT_INVALID_BOUND:     return RPC_S_INVALID_BOUND;
 343     case NCA_S_RPC_VERSION_MISMATCH:    return RPC_S_PROTOCOL_ERROR;
 344     case NCA_S_UNSPEC_REJECT:           return RPC_S_CALL_FAILED_DNE;
 345     case NCA_S_BAD_ACTID:               return RPC_S_CALL_FAILED_DNE;
 346     case NCA_S_WHO_ARE_YOU_FAILED:      return RPC_S_CALL_FAILED;
 347     case NCA_S_MANAGER_NOT_ENTERED:     return RPC_S_CALL_FAILED_DNE;
 348     case NCA_S_FAULT_CANCEL:            return RPC_S_CALL_CANCELLED;
 349     case NCA_S_FAULT_ILL_INST:          return RPC_S_ADDRESS_ERROR;
 350     case NCA_S_FAULT_FP_ERROR:          return RPC_S_FP_OVERFLOW;
 351     case NCA_S_FAULT_INT_OVERFLOW:      return RPC_S_ADDRESS_ERROR;
 352     case NCA_S_FAULT_UNSPEC:            return RPC_S_CALL_FAILED;
 353     case NCA_S_FAULT_PIPE_EMPTY:        return RPC_X_PIPE_EMPTY;
 354     case NCA_S_FAULT_PIPE_CLOSED:       return RPC_X_PIPE_CLOSED;
 355     case NCA_S_FAULT_PIPE_ORDER:        return RPC_X_WRONG_PIPE_ORDER;
 356     case NCA_S_FAULT_PIPE_DISCIPLINE:   return RPC_X_PIPE_DISCIPLINE_ERROR;
 357     case NCA_S_FAULT_PIPE_COMM_ERROR:   return RPC_S_COMM_FAILURE;
 358     case NCA_S_FAULT_PIPE_MEMORY:       return ERROR_OUTOFMEMORY;
 359     case NCA_S_FAULT_CONTEXT_MISMATCH:  return ERROR_INVALID_HANDLE;
 360     case NCA_S_FAULT_REMOTE_NO_MEMORY:  return ERROR_NOT_ENOUGH_SERVER_MEMORY;
 361     default:                            return status;
 362     }
 363 }
 364
 365 static RPC_STATUS RPCRT4_SecurePacket(RpcConnection *Connection,
 366     enum secure_packet_direction dir,
 367     RpcPktHdr *hdr, unsigned int hdr_size,
 368     unsigned char *stub_data, unsigned int stub_data_size,
 369     RpcAuthVerifier *auth_hdr,
 370     unsigned char *auth_value, unsigned int auth_value_size)
 371 {
 372     SecBufferDesc message;
 373     SecBuffer buffers[4];
 374     SECURITY_STATUS sec_status;
 375
 376     message.ulVersion = SECBUFFER_VERSION;
 377     message.cBuffers = sizeof(buffers)/sizeof(buffers[0]);
 378     message.pBuffers = buffers;
 379
 380     buffers[0].cbBuffer = hdr_size;
 381     buffers[0].BufferType = SECBUFFER_DATA|SECBUFFER_READONLY_WITH_CHECKSUM;
 382     buffers[0].pvBuffer = hdr;
 383     buffers[1].cbBuffer = stub_data_size;
 384     buffers[1].BufferType = SECBUFFER_DATA;
 385     buffers[1].pvBuffer = stub_data;
 386     buffers[2].cbBuffer = sizeof(*auth_hdr);
 387     buffers[2].BufferType = SECBUFFER_DATA|SECBUFFER_READONLY_WITH_CHECKSUM;
 388     buffers[2].pvBuffer = auth_hdr;
 389     buffers[3].cbBuffer = auth_value_size;
 390     buffers[3].BufferType = SECBUFFER_TOKEN;
 391     buffers[3].pvBuffer = auth_value;
 392
 393     if (dir == SECURE_PACKET_SEND)
 394     {
 395         if ((auth_hdr->auth_level == RPC_C_AUTHN_LEVEL_PKT_PRIVACY) && packet_has_body(hdr))
 396         {
 397             sec_status = EncryptMessage(&Connection->ctx, 0, &message, 0 /* FIXME */);
 398             if (sec_status != SEC_E_OK)
 399             {
 400                 ERR("EncryptMessage failed with 0x%08x\n", sec_status);
 401                 return RPC_S_SEC_PKG_ERROR;
 402             }
 403         }
 404         else if (auth_hdr->auth_level != RPC_C_AUTHN_LEVEL_NONE)
 405         {
 406             sec_status = MakeSignature(&Connection->ctx, 0, &message, 0 /* FIXME */);
 407             if (sec_status != SEC_E_OK)
 408             {
 409                 ERR("MakeSignature failed with 0x%08x\n", sec_status);
 410                 return RPC_S_SEC_PKG_ERROR;
 411             }
 412         }
 413     }
 414     else if (dir == SECURE_PACKET_RECEIVE)
 415     {
 416         if ((auth_hdr->auth_level == RPC_C_AUTHN_LEVEL_PKT_PRIVACY) && packet_has_body(hdr))
 417         {
 418             sec_status = DecryptMessage(&Connection->ctx, &message, 0 /* FIXME */, 0);
 419             if (sec_status != SEC_E_OK)
 420             {
 421                 ERR("DecryptMessage failed with 0x%08x\n", sec_status);
 422                 return RPC_S_SEC_PKG_ERROR;
 423             }
 424         }
 425         else if (auth_hdr->auth_level != RPC_C_AUTHN_LEVEL_NONE)
 426         {
 427             sec_status = VerifySignature(&Connection->ctx, &message, 0 /* FIXME */, NULL);
 428             if (sec_status != SEC_E_OK)
 429             {
 430                 ERR("VerifySignature failed with 0x%08x\n", sec_status);
 431                 return RPC_S_SEC_PKG_ERROR;
 432             }
 433         }
 434     }
 435
 436     return RPC_S_OK;
 437 }
 438
 439 /***********************************************************************
 440  *           RPCRT4_SendAuth (internal)
 441  *
 442  * Transmit a packet with authorization data over connection in acceptable fragments.
 443  */
 444 static RPC_STATUS RPCRT4_SendAuth(RpcConnection *Connection, RpcPktHdr *Header,
 445                                   void *Buffer, unsigned int BufferLength,
 446                                   const void *Auth, unsigned int AuthLength)
 447 {
 448   PUCHAR buffer_pos;
 449   DWORD hdr_size;
 450   LONG count;
 451   unsigned char *pkt;
 452   LONG alen;
 453   RPC_STATUS status;
 454
 455   RPCRT4_SetThreadCurrentConnection(Connection);
 456
 457   buffer_pos = Buffer;
 458   /* The packet building functions save the packet header size, so we can use it. */
 459   hdr_size = Header->common.frag_len;
 460   if (AuthLength)
 461     Header->common.auth_len = AuthLength;
 462   else if (Connection->AuthInfo && packet_has_auth_verifier(Header))
 463   {
 464     if ((Connection->AuthInfo->AuthnLevel == RPC_C_AUTHN_LEVEL_PKT_PRIVACY) && packet_has_body(Header))
 465       Header->common.auth_len = Connection->encryption_auth_len;
 466     else
 467       Header->common.auth_len = Connection->signature_auth_len;
 468   }
 469   else
 470     Header->common.auth_len = 0;
 471   Header->common.flags |= RPC_FLG_FIRST;
 472   Header->common.flags &= ~RPC_FLG_LAST;
 473
 474   alen = RPC_AUTH_VERIFIER_LEN(&Header->common);
 475
 476   while (!(Header->common.flags & RPC_FLG_LAST)) {
 477     unsigned char auth_pad_len = Header->common.auth_len ? ROUND_UP_AMOUNT(BufferLength, AUTH_ALIGNMENT) : 0;
 478     unsigned int pkt_size = BufferLength + hdr_size + alen + auth_pad_len;
 479
 480     /* decide if we need to split the packet into fragments */
 481    if (pkt_size <= Connection->MaxTransmissionSize) {
 482      Header->common.flags |= RPC_FLG_LAST;
 483      Header->common.frag_len = pkt_size;
 484     } else {
 485       auth_pad_len = 0;
 486       /* make sure packet payload will be a multiple of 16 */
 487       Header->common.frag_len =
 488         ((Connection->MaxTransmissionSize - hdr_size - alen) & ~(AUTH_ALIGNMENT-1)) +
 489         hdr_size + alen;
 490     }
 491
 492     pkt = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, Header->common.frag_len);
 493
 494     memcpy(pkt, Header, hdr_size);
 495
 496     /* fragment consisted of header only and is the last one */
 497     if (hdr_size == Header->common.frag_len)
 498       goto write;
 499
 500     memcpy(pkt + hdr_size, buffer_pos, Header->common.frag_len - hdr_size - auth_pad_len - alen);
 501
 502     /* add the authorization info */
 503     if (Connection->AuthInfo && packet_has_auth_verifier(Header))
 504     {
 505       RpcAuthVerifier *auth_hdr = (RpcAuthVerifier *)&pkt[Header->common.frag_len - alen];
 506
 507       auth_hdr->auth_type = Connection->AuthInfo->AuthnSvc;
 508       auth_hdr->auth_level = Connection->AuthInfo->AuthnLevel;
 509       auth_hdr->auth_pad_length = auth_pad_len;
 510       auth_hdr->auth_reserved = 0;
 511       /* a unique number... */
 512       auth_hdr->auth_context_id = (unsigned long)Connection;
 513
 514       if (AuthLength)
 515         memcpy(auth_hdr + 1, Auth, AuthLength);
 516       else
 517       {
 518         status = RPCRT4_SecurePacket(Connection, SECURE_PACKET_SEND,
 519             (RpcPktHdr *)pkt, hdr_size,
 520             pkt + hdr_size, Header->common.frag_len - hdr_size - alen,
 521             auth_hdr,
 522             (unsigned char *)(auth_hdr + 1), Header->common.auth_len);
 523         if (status != RPC_S_OK)
 524         {
 525           HeapFree(GetProcessHeap(), 0, pkt);
 526           RPCRT4_SetThreadCurrentConnection(NULL);
 527           return status;
 528         }
 529       }
 530     }
 531
 532 write:
 533     count = rpcrt4_conn_write(Connection, pkt, Header->common.frag_len);
 534     HeapFree(GetProcessHeap(), 0, pkt);
 535     if (count<0) {
 536       WARN("rpcrt4_conn_write failed (auth)\n");
 537       RPCRT4_SetThreadCurrentConnection(NULL);
 538       return RPC_S_CALL_FAILED;
 539     }
 540
 541     buffer_pos += Header->common.frag_len - hdr_size - alen - auth_pad_len;
 542     BufferLength -= Header->common.frag_len - hdr_size - alen - auth_pad_len;
 543     Header->common.flags &= ~RPC_FLG_FIRST;
 544   }
 545
 546   RPCRT4_SetThreadCurrentConnection(NULL);
 547   return RPC_S_OK;
 548 }
 549
 550 /***********************************************************************
 551  *           RPCRT4_ClientAuthorize (internal)
 552  *
 553  * Authorize a client connection. A NULL in param signifies a new connection.
 554  */
 555 static RPC_STATUS RPCRT4_ClientAuthorize(RpcConnection *conn, SecBuffer *in,
 556                                          SecBuffer *out)
 557 {
 558   SECURITY_STATUS r;
 559   SecBufferDesc out_desc;
 560   SecBufferDesc inp_desc;
 561   SecPkgContext_Sizes secctx_sizes;
 562   BOOL continue_needed;
 563   ULONG context_req = ISC_REQ_CONNECTION | ISC_REQ_USE_DCE_STYLE |
 564                       ISC_REQ_MUTUAL_AUTH | ISC_REQ_DELEGATE;
 565
 566   if (conn->AuthInfo->AuthnLevel == RPC_C_AUTHN_LEVEL_PKT_INTEGRITY)
 567     context_req |= ISC_REQ_INTEGRITY;
 568   else if (conn->AuthInfo->AuthnLevel == RPC_C_AUTHN_LEVEL_PKT_PRIVACY)
 569     context_req |= ISC_REQ_CONFIDENTIALITY | ISC_REQ_INTEGRITY;
 570
 571   out->BufferType = SECBUFFER_TOKEN;
 572   out->cbBuffer = conn->AuthInfo->cbMaxToken;
 573   out->pvBuffer = HeapAlloc(GetProcessHeap(), 0, out->cbBuffer);
 574   if (!out->pvBuffer) return ERROR_OUTOFMEMORY;
 575
 576   out_desc.ulVersion = 0;
 577   out_desc.cBuffers = 1;
 578   out_desc.pBuffers = out;
 579
 580   inp_desc.cBuffers = 1;
 581   inp_desc.pBuffers = in;
 582   inp_desc.ulVersion = 0;
 583
 584   r = InitializeSecurityContextA(&conn->AuthInfo->cred, in ? &conn->ctx : NULL,
 585         NULL, context_req, 0, SECURITY_NETWORK_DREP,
 586         in ? &inp_desc : NULL, 0, &conn->ctx, &out_desc, &conn->attr,
 587         &conn->exp);
 588   if (FAILED(r))
 589   {
 590       WARN("InitializeSecurityContext failed with error 0x%08x\n", r);
 591       goto failed;
 592   }
 593
 594   TRACE("r = 0x%08x, attr = 0x%08x\n", r, conn->attr);
 595   continue_needed = ((r == SEC_I_CONTINUE_NEEDED) ||
 596                      (r == SEC_I_COMPLETE_AND_CONTINUE));
 597
 598   if ((r == SEC_I_COMPLETE_NEEDED) || (r == SEC_I_COMPLETE_AND_CONTINUE))
 599   {
 600       TRACE("complete needed\n");
 601       r = CompleteAuthToken(&conn->ctx, &out_desc);
 602       if (FAILED(r))
 603       {
 604           WARN("CompleteAuthToken failed with error 0x%08x\n", r);
 605           goto failed;
 606       }
 607   }
 608
 609   TRACE("cbBuffer = %ld\n", out->cbBuffer);
 610
 611   if (!continue_needed)
 612   {
 613       r = QueryContextAttributesA(&conn->ctx, SECPKG_ATTR_SIZES, &secctx_sizes);
 614       if (FAILED(r))
 615       {
 616           WARN("QueryContextAttributes failed with error 0x%08x\n", r);
 617           goto failed;
 618       }
 619       conn->signature_auth_len = secctx_sizes.cbMaxSignature;
 620       conn->encryption_auth_len = secctx_sizes.cbSecurityTrailer;
 621   }
 622
 623   return RPC_S_OK;
 624
 625 failed:
 626   HeapFree(GetProcessHeap(), 0, out->pvBuffer);
 627   out->pvBuffer = NULL;
 628   return ERROR_ACCESS_DENIED; /* FIXME: is this correct? */
 629 }
 630
 631 /***********************************************************************
 632  *           RPCRT4_AuthorizeBinding (internal)
 633  */
 634 static RPC_STATUS RPCRT_AuthorizeConnection(RpcConnection* conn,
 635                                             BYTE *challenge, ULONG count)
 636 {
 637   SecBuffer inp, out;
 638   RpcPktHdr *resp_hdr;
 639   RPC_STATUS status;
 640
 641   TRACE("challenge %s, %d bytes\n", challenge, count);
 642
 643   inp.BufferType = SECBUFFER_TOKEN;
 644   inp.pvBuffer = challenge;
 645   inp.cbBuffer = count;
 646
 647   status = RPCRT4_ClientAuthorize(conn, &inp, &out);
 648   if (status) return status;
 649
 650   resp_hdr = RPCRT4_BuildAuthHeader(NDR_LOCAL_DATA_REPRESENTATION);
 651   if (!resp_hdr)
 652     return E_OUTOFMEMORY;
 653
 654   status = RPCRT4_SendAuth(conn, resp_hdr, NULL, 0, out.pvBuffer, out.cbBuffer);
 655
 656   HeapFree(GetProcessHeap(), 0, out.pvBuffer);
 657   RPCRT4_FreeHeader(resp_hdr);
 658
 659   return status;
 660 }
 661
 662 /***********************************************************************
 663  *           RPCRT4_Send (internal)
 664  *
 665  * Transmit a packet over connection in acceptable fragments.
 666  */
 667 RPC_STATUS RPCRT4_Send(RpcConnection *Connection, RpcPktHdr *Header,
 668                        void *Buffer, unsigned int BufferLength)
 669 {
 670   RPC_STATUS r;
 671   SecBuffer out;
 672
 673   if (!Connection->AuthInfo || SecIsValidHandle(&Connection->ctx))
 674   {
 675     return RPCRT4_SendAuth(Connection, Header, Buffer, BufferLength, NULL, 0);
 676   }
 677
 678   /* tack on a negotiate packet */
 679   RPCRT4_ClientAuthorize(Connection, NULL, &out);
 680   r = RPCRT4_SendAuth(Connection, Header, Buffer, BufferLength, out.pvBuffer, out.cbBuffer);
 681   HeapFree(GetProcessHeap(), 0, out.pvBuffer);
 682
 683   return r;
 684 }
 685
 686 /* validates version and frag_len fields */
 687 RPC_STATUS RPCRT4_ValidateCommonHeader(const RpcPktCommonHdr *hdr)
 688 {
 689   DWORD hdr_length;
 690
 691   /* verify if the header really makes sense */
 692   if (hdr->rpc_ver != RPC_VER_MAJOR ||
 693       hdr->rpc_ver_minor != RPC_VER_MINOR)
 694   {
 695     WARN("unhandled packet version\n");
 696     return RPC_S_PROTOCOL_ERROR;
 697   }
 698
 699   hdr_length = RPCRT4_GetHeaderSize((const RpcPktHdr*)hdr);
 700   if (hdr_length == 0)
 701   {
 702     WARN("header length == 0\n");
 703     return RPC_S_PROTOCOL_ERROR;
 704   }
 705
 706   if (hdr->frag_len < hdr_length)
 707   {
 708     WARN("bad frag length %d\n", hdr->frag_len);
 709     return RPC_S_PROTOCOL_ERROR;
 710   }
 711
 712   return RPC_S_OK;
 713 }
 714
 715 /***********************************************************************
 716  *           RPCRT4_receive_fragment (internal)
 717  *
 718  * Receive a fragment from a connection.
 719  */
 720 RPC_STATUS RPCRT4_receive_fragment(RpcConnection *Connection, RpcPktHdr **Header, void **Payload)
 721 {
 722   RPC_STATUS status;
 723   DWORD hdr_length;
 724   LONG dwRead;
 725   RpcPktCommonHdr common_hdr;
 726
 727   *Header = NULL;
 728   *Payload = NULL;
 729
 730   TRACE("(%p, %p, %p)\n", Connection, Header, Payload);
 731
 732   /* read packet common header */
 733   dwRead = rpcrt4_conn_read(Connection, &common_hdr, sizeof(common_hdr));
 734   if (dwRead != sizeof(common_hdr)) {
 735     WARN("Short read of header, %d bytes\n", dwRead);
 736     status = RPC_S_CALL_FAILED;
 737     goto fail;
 738   }
 739
 740   status = RPCRT4_ValidateCommonHeader(&common_hdr);
 741   if (status != RPC_S_OK) goto fail;
 742
 743   hdr_length = RPCRT4_GetHeaderSize((RpcPktHdr*)&common_hdr);
 744   if (hdr_length == 0) {
 745     WARN("header length == 0\n");
 746     status = RPC_S_PROTOCOL_ERROR;
 747     goto fail;
 748   }
 749
 750   *Header = HeapAlloc(GetProcessHeap(), 0, hdr_length);
 751   memcpy(*Header, &common_hdr, sizeof(common_hdr));
 752
 753   /* read the rest of packet header */
 754   dwRead = rpcrt4_conn_read(Connection, &(*Header)->common + 1, hdr_length - sizeof(common_hdr));
 755   if (dwRead != hdr_length - sizeof(common_hdr)) {
 756     WARN("bad header length, %d bytes, hdr_length %d\n", dwRead, hdr_length);
 757     status = RPC_S_CALL_FAILED;
 758     goto fail;
 759   }
 760
 761   if (common_hdr.frag_len - hdr_length)
 762   {
 763     *Payload = HeapAlloc(GetProcessHeap(), 0, common_hdr.frag_len - hdr_length);
 764     if (!*Payload)
 765     {
 766       status = RPC_S_OUT_OF_RESOURCES;
 767       goto fail;
 768     }
 769
 770     dwRead = rpcrt4_conn_read(Connection, *Payload, common_hdr.frag_len - hdr_length);
 771     if (dwRead != common_hdr.frag_len - hdr_length)
 772     {
 773       WARN("bad data length, %d/%d\n", dwRead, common_hdr.frag_len - hdr_length);
 774       status = RPC_S_CALL_FAILED;
 775       goto fail;
 776     }
 777   }
 778   else
 779     *Payload = NULL;
 780
 781   /* success */
 782   status = RPC_S_OK;
 783
 784 fail:
 785   if (status != RPC_S_OK) {
 786     RPCRT4_FreeHeader(*Header);
 787     *Header = NULL;
 788     HeapFree(GetProcessHeap(), 0, *Payload);
 789     *Payload = NULL;
 790   }
 791   return status;
 792 }
 793
 794 /***********************************************************************
 795  *           RPCRT4_Receive (internal)
 796  *
 797  * Receive a packet from connection and merge the fragments.
 798  */
 799 RPC_STATUS RPCRT4_Receive(RpcConnection *Connection, RpcPktHdr **Header,
 800                           PRPC_MESSAGE pMsg)
 801 {
 802   RPC_STATUS status;
 803   DWORD hdr_length;
 804   unsigned short first_flag;
 805   unsigned long data_length;
 806   unsigned long buffer_length;
 807   unsigned long auth_length;
 808   unsigned char *auth_data = NULL;
 809   RpcPktHdr *CurrentHeader;
 810   void *payload = NULL;
 811
 812   *Header = NULL;
 813
 814   TRACE("(%p, %p, %p)\n", Connection, Header, pMsg);
 815
 816   RPCRT4_SetThreadCurrentConnection(Connection);
 817
 818   status = RPCRT4_receive_fragment(Connection, Header, &payload);
 819   if (status != RPC_S_OK) goto fail;
 820
 821   hdr_length = RPCRT4_GetHeaderSize(*Header);
 822
 823   /* read packet body */
 824   switch ((*Header)->common.ptype) {
 825   case PKT_RESPONSE:
 826     pMsg->BufferLength = (*Header)->response.alloc_hint;
 827     break;
 828   case PKT_REQUEST:
 829     pMsg->BufferLength = (*Header)->request.alloc_hint;
 830     break;
 831   default:
 832     pMsg->BufferLength = (*Header)->common.frag_len - hdr_length - RPC_AUTH_VERIFIER_LEN(&(*Header)->common);
 833   }
 834
 835   TRACE("buffer length = %u\n", pMsg->BufferLength);
 836
 837   pMsg->Buffer = I_RpcAllocate(pMsg->BufferLength);
 838   if (!pMsg->Buffer)
 839   {
 840     status = ERROR_OUTOFMEMORY;
 841     goto fail;
 842   }
 843
 844   first_flag = RPC_FLG_FIRST;
 845   auth_length = (*Header)->common.auth_len;
 846   if (auth_length) {
 847     auth_data = HeapAlloc(GetProcessHeap(), 0, RPC_AUTH_VERIFIER_LEN(&(*Header)->common));
 848     if (!auth_data) {
 849       status = RPC_S_OUT_OF_RESOURCES;
 850       goto fail;
 851     }
 852   }
 853   CurrentHeader = *Header;
 854   buffer_length = 0;
 855   while (TRUE)
 856   {
 857     unsigned int header_auth_len = RPC_AUTH_VERIFIER_LEN(&CurrentHeader->common);
 858
 859     /* verify header fields */
 860
 861     if ((CurrentHeader->common.frag_len < hdr_length) ||
 862         (CurrentHeader->common.frag_len - hdr_length < header_auth_len)) {
 863       WARN("frag_len %d too small for hdr_length %d and auth_len %d\n",
 864         CurrentHeader->common.frag_len, hdr_length, CurrentHeader->common.auth_len);
 865       status = RPC_S_PROTOCOL_ERROR;
 866       goto fail;
 867     }
 868
 869     if ((CurrentHeader->common.flags & RPC_FLG_FIRST) != first_flag) {
 870       WARN("auth_len header field changed from %ld to %d\n",
 871         auth_length, (*Header)->common.auth_len);
 872       status = RPC_S_PROTOCOL_ERROR;
 873       goto fail;
 874     }
 875
 876     if (((*Header)->common.flags & RPC_FLG_FIRST) != first_flag) {
 877       TRACE("invalid packet flags\n");
 878       status = RPC_S_PROTOCOL_ERROR;
 879       goto fail;
 880     }
 881
 882     data_length = CurrentHeader->common.frag_len - hdr_length - header_auth_len;
 883     if (data_length + buffer_length > pMsg->BufferLength) {
 884       TRACE("allocation hint exceeded, new buffer length = %ld\n",
 885         data_length + buffer_length);
 886       pMsg->BufferLength = data_length + buffer_length;
 887       status = I_RpcReAllocateBuffer(pMsg);
 888       if (status != RPC_S_OK) goto fail;
 889     }
 890
 891     memcpy((unsigned char *)pMsg->Buffer + buffer_length, payload, data_length);
 892
 893     if (header_auth_len) {
 894       if (header_auth_len < sizeof(RpcAuthVerifier) ||
 895           header_auth_len > RPC_AUTH_VERIFIER_LEN(&(*Header)->common)) {
 896         WARN("bad auth verifier length %d\n", header_auth_len);
 897         status = RPC_S_PROTOCOL_ERROR;
 898         goto fail;
 899       }
 900
 901       /* FIXME: we should accumulate authentication data for the bind,
 902        * bind_ack, alter_context and alter_context_response if necessary.
 903        * however, the details of how this is done is very sketchy in the
 904        * DCE/RPC spec. for all other packet types that have authentication
 905        * verifier data then it is just duplicated in all the fragments */
 906       memcpy(auth_data, (unsigned char *)payload + data_length, header_auth_len);
 907
 908       /* these packets are handled specially, not by the generic SecurePacket
 909        * function */
 910       if (((*Header)->common.ptype != PKT_BIND) &&
 911           ((*Header)->common.ptype != PKT_BIND_ACK) &&
 912           ((*Header)->common.ptype != PKT_AUTH3))
 913       {
 914         status = RPCRT4_SecurePacket(Connection, SECURE_PACKET_RECEIVE,
 915             CurrentHeader, hdr_length,
 916             (unsigned char *)pMsg->Buffer + buffer_length, data_length,
 917             (RpcAuthVerifier *)auth_data,
 918             auth_data + sizeof(RpcAuthVerifier),
 919             header_auth_len - sizeof(RpcAuthVerifier));
 920         if (status != RPC_S_OK) goto fail;
 921       }
 922     }
 923
 924     buffer_length += data_length;
 925     if (!(CurrentHeader->common.flags & RPC_FLG_LAST)) {
 926       TRACE("next header\n");
 927
 928       if (*Header != CurrentHeader)
 929       {
 930           RPCRT4_FreeHeader(CurrentHeader);
 931           CurrentHeader = NULL;
 932       }
 933       HeapFree(GetProcessHeap(), 0, payload);
 934       payload = NULL;
 935
 936       status = RPCRT4_receive_fragment(Connection, &CurrentHeader, &payload);
 937       if (status != RPC_S_OK) goto fail;
 938
 939       first_flag = 0;
 940     } else {
 941       break;
 942     }
 943   }
 944   pMsg->BufferLength = buffer_length;
 945
 946   /* respond to authorization request */
 947   if ((*Header)->common.ptype == PKT_BIND_ACK && auth_length > sizeof(RpcAuthVerifier))
 948   {
 949     status = RPCRT_AuthorizeConnection(Connection,
 950                                        auth_data + sizeof(RpcAuthVerifier),
 951                                        auth_length);
 952     if (status)
 953         goto fail;
 954   }
 955
 956   /* success */
 957   status = RPC_S_OK;
 958
 959 fail:
 960   RPCRT4_SetThreadCurrentConnection(NULL);
 961   if (CurrentHeader != *Header)
 962     RPCRT4_FreeHeader(CurrentHeader);
 963   if (status != RPC_S_OK) {
 964     RPCRT4_FreeHeader(*Header);
 965     *Header = NULL;
 966   }
 967   HeapFree(GetProcessHeap(), 0, auth_data);
 968   HeapFree(GetProcessHeap(), 0, payload);
 969   return status;
 970 }
 971
 972 /***********************************************************************
 973  *           I_RpcNegotiateTransferSyntax [RPCRT4.@]
 974  *
 975  * Negotiates the transfer syntax used by a client connection by connecting
 976  * to the server.
 977  *
 978  * PARAMS
 979  *  pMsg   [I] RPC Message structure.
 980  *  pAsync [I] Asynchronous state to set.
 981  *
 982  * RETURNS
 983  *  Success: RPC_S_OK.
 984  *  Failure: Any error code.
 985  */
 986 RPC_STATUS WINAPI I_RpcNegotiateTransferSyntax(PRPC_MESSAGE pMsg)
 987 {
 988   RpcBinding* bind = (RpcBinding*)pMsg->Handle;
 989   RpcConnection* conn;
 990   RPC_STATUS status = RPC_S_OK;
 991
 992   TRACE("(%p)\n", pMsg);
 993
 994   if (!bind || bind->server)
 995     return RPC_S_INVALID_BINDING;
 996
 997   /* if we already have a connection, we don't need to negotiate again */
 998   if (!pMsg->ReservedForRuntime)
 999   {
1000     RPC_CLIENT_INTERFACE *cif = pMsg->RpcInterfaceInformation;
1001     if (!cif) return RPC_S_INTERFACE_NOT_FOUND;
1002
1003     if (!bind->Endpoint || !bind->Endpoint[0])
1004     {
1005       TRACE("automatically resolving partially bound binding\n");
1006       status = RpcEpResolveBinding(bind, cif);
1007       if (status != RPC_S_OK) return status;
1008     }
1009
1010     status = RPCRT4_OpenBinding(bind, &conn, &cif->TransferSyntax,
1011                                 &cif->InterfaceId);
1012
1013     if (status == RPC_S_OK)
1014       pMsg->ReservedForRuntime = conn;
1015   }
1016
1017   return status;
1018 }
1019
1020 /***********************************************************************
1021  *           I_RpcGetBuffer [RPCRT4.@]
1022  *
1023  * Allocates a buffer for use by I_RpcSend or I_RpcSendReceive and binds to the
1024  * server interface.
1025  *
1026  * PARAMS
1027  *  pMsg [I/O] RPC message information.
1028  *
1029  * RETURNS
1030  *  Success: RPC_S_OK.
1031  *  Failure: RPC_S_INVALID_BINDING if pMsg->Handle is invalid.
1032  *           RPC_S_SERVER_UNAVAILABLE if unable to connect to server.
1033  *           ERROR_OUTOFMEMORY if buffer allocation failed.
1034  *
1035  * NOTES
1036  *  The pMsg->BufferLength field determines the size of the buffer to allocate,
1037  *  in bytes.
1038  *
1039  *  Use I_RpcFreeBuffer() to unbind from the server and free the message buffer.
1040  *
1041  * SEE ALSO
1042  *  I_RpcFreeBuffer(), I_RpcSend(), I_RpcReceive(), I_RpcSendReceive().
1043  */
1044 RPC_STATUS WINAPI I_RpcGetBuffer(PRPC_MESSAGE pMsg)
1045 {
1046   RPC_STATUS status;
1047   RpcBinding* bind = (RpcBinding*)pMsg->Handle;
1048
1049   TRACE("(%p): BufferLength=%d\n", pMsg, pMsg->BufferLength);
1050
1051   if (!bind)
1052     return RPC_S_INVALID_BINDING;
1053
1054   pMsg->Buffer = I_RpcAllocate(pMsg->BufferLength);
1055   TRACE("Buffer=%p\n", pMsg->Buffer);
1056
1057   if (!pMsg->Buffer)
1058     return ERROR_OUTOFMEMORY;
1059
1060   if (!bind->server)
1061   {
1062     status = I_RpcNegotiateTransferSyntax(pMsg);
1063     if (status != RPC_S_OK)
1064       I_RpcFree(pMsg->Buffer);
1065   }
1066   else
1067     status = RPC_S_OK;
1068
1069   return status;
1070 }
1071
1072 /***********************************************************************
1073  *           I_RpcReAllocateBuffer (internal)
1074  */
1075 static RPC_STATUS I_RpcReAllocateBuffer(PRPC_MESSAGE pMsg)
1076 {
1077   TRACE("(%p): BufferLength=%d\n", pMsg, pMsg->BufferLength);
1078   pMsg->Buffer = HeapReAlloc(GetProcessHeap(), 0, pMsg->Buffer, pMsg->BufferLength);
1079
1080   TRACE("Buffer=%p\n", pMsg->Buffer);
1081   return pMsg->Buffer ? RPC_S_OK : ERROR_OUTOFMEMORY;
1082 }
1083
1084 /***********************************************************************
1085  *           I_RpcFreeBuffer [RPCRT4.@]
1086  *
1087  * Frees a buffer allocated by I_RpcGetBuffer or I_RpcReceive and unbinds from
1088  * the server interface.
1089  *
1090  * PARAMS
1091  *  pMsg [I/O] RPC message information.
1092  *
1093  * RETURNS
1094  *  RPC_S_OK.
1095  *
1096  * SEE ALSO
1097  *  I_RpcGetBuffer(), I_RpcReceive().
1098  */
1099 RPC_STATUS WINAPI I_RpcFreeBuffer(PRPC_MESSAGE pMsg)
1100 {
1101   RpcBinding* bind = (RpcBinding*)pMsg->Handle;
1102
1103   TRACE("(%p) Buffer=%p\n", pMsg, pMsg->Buffer);
1104
1105   if (!bind) return RPC_S_INVALID_BINDING;
1106
1107   if (pMsg->ReservedForRuntime)
1108   {
1109     RpcConnection *conn = pMsg->ReservedForRuntime;
1110     RPCRT4_CloseBinding(bind, conn);
1111     pMsg->ReservedForRuntime = NULL;
1112   }
1113   I_RpcFree(pMsg->Buffer);
1114   return RPC_S_OK;
1115 }
1116
1117 static void CALLBACK async_apc_notifier_proc(ULONG_PTR ulParam)
1118 {
1119     RPC_ASYNC_STATE *state = (RPC_ASYNC_STATE *)ulParam;
1120     state->u.APC.NotificationRoutine(state, NULL, state->Event);
1121 }
1122
1123 static DWORD WINAPI async_notifier_proc(LPVOID p)
1124 {
1125     RpcConnection *conn = p;
1126     RPC_ASYNC_STATE *state = conn->async_state;
1127
1128     if (state && !conn->ops->wait_for_incoming_data(conn))
1129     {
1130         state->Event = RpcCallComplete;
1131         switch (state->NotificationType)
1132         {
1133         case RpcNotificationTypeEvent:
1134             SetEvent(state->u.hEvent);
1135             break;
1136         case RpcNotificationTypeApc:
1137             QueueUserAPC(async_apc_notifier_proc, state->u.APC.hThread, (ULONG_PTR)state);
1138             break;
1139         case RpcNotificationTypeIoc:
1140             PostQueuedCompletionStatus(state->u.IOC.hIOPort,
1141                 state->u.IOC.dwNumberOfBytesTransferred,
1142                 state->u.IOC.dwCompletionKey,
1143                 state->u.IOC.lpOverlapped);
1144             break;
1145         case RpcNotificationTypeHwnd:
1146             PostMessageW(state->u.HWND.hWnd, state->u.HWND.Msg, 0, 0);
1147             break;
1148         case RpcNotificationTypeCallback:
1149             state->u.NotificationRoutine(state, NULL, state->Event);
1150             break;
1151         case RpcNotificationTypeNone:
1152         default:
1153             break;
1154         }
1155     }
1156
1157     return 0;
1158 }
1159
1160 /***********************************************************************
1161  *           I_RpcSend [RPCRT4.@]
1162  *
1163  * Sends a message to the server.
1164  *
1165  * PARAMS
1166  *  pMsg [I/O] RPC message information.
1167  *
1168  * RETURNS
1169  *  Unknown.
1170  *
1171  * NOTES
1172  *  The buffer must have been allocated with I_RpcGetBuffer().
1173  *
1174  * SEE ALSO
1175  *  I_RpcGetBuffer(), I_RpcReceive(), I_RpcSendReceive().
1176  */
1177 RPC_STATUS WINAPI I_RpcSend(PRPC_MESSAGE pMsg)
1178 {
1179   RpcBinding* bind = (RpcBinding*)pMsg->Handle;
1180   RpcConnection* conn;
1181   RPC_STATUS status;
1182   RpcPktHdr *hdr;
1183
1184   TRACE("(%p)\n", pMsg);
1185   if (!bind || bind->server || !pMsg->ReservedForRuntime) return RPC_S_INVALID_BINDING;
1186
1187   conn = pMsg->ReservedForRuntime;
1188
1189   hdr = RPCRT4_BuildRequestHeader(pMsg->DataRepresentation,
1190                                   pMsg->BufferLength,
1191                                   pMsg->ProcNum & ~RPC_FLAGS_VALID_BIT,
1192                                   &bind->ObjectUuid);
1193   if (!hdr)
1194     return ERROR_OUTOFMEMORY;
1195   hdr->common.call_id = conn->NextCallId++;
1196
1197   status = RPCRT4_Send(conn, hdr, pMsg->Buffer, pMsg->BufferLength);
1198
1199   RPCRT4_FreeHeader(hdr);
1200
1201   if (status == RPC_S_OK && pMsg->RpcFlags & RPC_BUFFER_ASYNC)
1202   {
1203     if (!QueueUserWorkItem(async_notifier_proc, conn, WT_EXECUTEDEFAULT | WT_EXECUTELONGFUNCTION))
1204         status = RPC_S_OUT_OF_RESOURCES;
1205   }
1206
1207   return status;
1208 }
1209
1210 /* is this status something that the server can't recover from? */
1211 static inline BOOL is_hard_error(RPC_STATUS status)
1212 {
1213     switch (status)
1214     {
1215     case 0: /* user-defined fault */
1216     case ERROR_ACCESS_DENIED:
1217     case ERROR_INVALID_PARAMETER:
1218     case RPC_S_PROTOCOL_ERROR:
1219     case RPC_S_CALL_FAILED:
1220     case RPC_S_CALL_FAILED_DNE:
1221     case RPC_S_SEC_PKG_ERROR:
1222         return TRUE;
1223     default:
1224         return FALSE;
1225     }
1226 }
1227
1228 /***********************************************************************
1229  *           I_RpcReceive [RPCRT4.@]
1230  */
1231 RPC_STATUS WINAPI I_RpcReceive(PRPC_MESSAGE pMsg)
1232 {
1233   RpcBinding* bind = (RpcBinding*)pMsg->Handle;
1234   RPC_STATUS status;
1235   RpcPktHdr *hdr = NULL;
1236   RpcConnection *conn;
1237
1238   TRACE("(%p)\n", pMsg);
1239   if (!bind || bind->server || !pMsg->ReservedForRuntime) return RPC_S_INVALID_BINDING;
1240
1241   conn = pMsg->ReservedForRuntime;
1242   status = RPCRT4_Receive(conn, &hdr, pMsg);
1243   if (status != RPC_S_OK) {
1244     WARN("receive failed with error %lx\n", status);
1245     goto fail;
1246   }
1247
1248   switch (hdr->common.ptype) {
1249   case PKT_RESPONSE:
1250     break;
1251   case PKT_FAULT:
1252     ERR ("we got fault packet with status 0x%lx\n", hdr->fault.status);
1253     status = NCA2RPC_STATUS(hdr->fault.status);
1254     if (is_hard_error(status))
1255         goto fail;
1256     break;
1257   default:
1258     WARN("bad packet type %d\n", hdr->common.ptype);
1259     status = RPC_S_PROTOCOL_ERROR;
1260     goto fail;
1261   }
1262
1263   /* success */
1264   RPCRT4_FreeHeader(hdr);
1265   return status;
1266
1267 fail:
1268   RPCRT4_FreeHeader(hdr);
1269   RPCRT4_DestroyConnection(conn);
1270   pMsg->ReservedForRuntime = NULL;
1271   return status;
1272 }
1273
1274 /***********************************************************************
1275  *           I_RpcSendReceive [RPCRT4.@]
1276  *
1277  * Sends a message to the server and receives the response.
1278  *
1279  * PARAMS
1280  *  pMsg [I/O] RPC message information.
1281  *
1282  * RETURNS
1283  *  Success: RPC_S_OK.
1284  *  Failure: Any error code.
1285  *
1286  * NOTES
1287  *  The buffer must have been allocated with I_RpcGetBuffer().
1288  *
1289  * SEE ALSO
1290  *  I_RpcGetBuffer(), I_RpcSend(), I_RpcReceive().
1291  */
1292 RPC_STATUS WINAPI I_RpcSendReceive(PRPC_MESSAGE pMsg)
1293 {
1294   RPC_STATUS status;
1295   void *original_buffer;
1296
1297   TRACE("(%p)\n", pMsg);
1298
1299   original_buffer = pMsg->Buffer;
1300   status = I_RpcSend(pMsg);
1301   if (status == RPC_S_OK)
1302     status = I_RpcReceive(pMsg);
1303   /* free the buffer replaced by a new buffer in I_RpcReceive */
1304   if (status == RPC_S_OK)
1305     I_RpcFree(original_buffer);
1306   return status;
1307 }
1308
1309 /***********************************************************************
1310  *           I_RpcAsyncSetHandle [RPCRT4.@]
1311  *
1312  * Sets the asynchronous state of the handle contained in the RPC message
1313  * structure.
1314  *
1315  * PARAMS
1316  *  pMsg   [I] RPC Message structure.
1317  *  pAsync [I] Asynchronous state to set.
1318  *
1319  * RETURNS
1320  *  Success: RPC_S_OK.
1321  *  Failure: Any error code.
1322  */
1323 RPC_STATUS WINAPI I_RpcAsyncSetHandle(PRPC_MESSAGE pMsg, PRPC_ASYNC_STATE pAsync)
1324 {
1325     RpcBinding* bind = (RpcBinding*)pMsg->Handle;
1326     RpcConnection *conn;
1327
1328     TRACE("(%p, %p)\n", pMsg, pAsync);
1329
1330     if (!bind || bind->server || !pMsg->ReservedForRuntime) return RPC_S_INVALID_BINDING;
1331
1332     conn = pMsg->ReservedForRuntime;
1333     conn->async_state = pAsync;
1334
1335     return RPC_S_OK;
1336 }
1337
1338 /***********************************************************************
1339  *           I_RpcAsyncAbortCall [RPCRT4.@]
1340  *
1341  * Aborts an asynchronous call.
1342  *
1343  * PARAMS
1344  *  pAsync        [I] Asynchronous state.
1345  *  ExceptionCode [I] Exception code.
1346  *
1347  * RETURNS
1348  *  Success: RPC_S_OK.
1349  *  Failure: Any error code.
1350  */
1351 RPC_STATUS WINAPI I_RpcAsyncAbortCall(PRPC_ASYNC_STATE pAsync, ULONG ExceptionCode)
1352 {
1353     FIXME("(%p, %d): stub\n", pAsync, ExceptionCode);
1354     return RPC_S_INVALID_ASYNC_HANDLE;
1355 }