source3/smbd/ipc.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Inter-process communication and named pipe handling
   4    Copyright (C) Andrew Tridgell 1992-1998
   5
   6    SMB Version handling
   7    Copyright (C) John H Terpstra 1995-1998
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22    */
  23 /*
  24    This file handles the named pipe and mailslot calls
  25    in the SMBtrans protocol
  26    */
  27
  28 #include "includes.h"
  29
  30 extern int max_send;
  31
  32 #define NERR_notsupported 50
  33
  34 extern int smb_read_error;
  35
  36 /*******************************************************************
  37  copies parameters and data, as needed, into the smb buffer
  38
  39  *both* the data and params sections should be aligned.  this
  40  is fudged in the rpc pipes by
  41  at present, only the data section is.  this may be a possible
  42  cause of some of the ipc problems being experienced.  lkcl26dec97
  43
  44  ******************************************************************/
  45
  46 static void copy_trans_params_and_data(char *outbuf, int align,
  47                                 char *rparam, int param_offset, int param_len,
  48                                 char *rdata, int data_offset, int data_len)
  49 {
  50         char *copy_into = smb_buf(outbuf)+1;
  51
  52         if(param_len < 0)
  53                 param_len = 0;
  54
  55         if(data_len < 0)
  56                 data_len = 0;
  57
  58         DEBUG(5,("copy_trans_params_and_data: params[%d..%d] data[%d..%d]\n",
  59                         param_offset, param_offset + param_len,
  60                         data_offset , data_offset  + data_len));
  61
  62         if (param_len)
  63                 memcpy(copy_into, &rparam[param_offset], param_len);
  64
  65         copy_into += param_len + align;
  66
  67         if (data_len )
  68                 memcpy(copy_into, &rdata[data_offset], data_len);
  69 }
  70
  71 /****************************************************************************
  72  Send a trans reply.
  73  ****************************************************************************/
  74
  75 void send_trans_reply(char *outbuf,
  76                                 char *rparam, int rparam_len,
  77                                 char *rdata, int rdata_len,
  78                                 BOOL buffer_too_large)
  79 {
  80         int this_ldata,this_lparam;
  81         int tot_data_sent = 0;
  82         int tot_param_sent = 0;
  83         int align;
  84
  85         int ldata  = rdata  ? rdata_len : 0;
  86         int lparam = rparam ? rparam_len : 0;
  87
  88         if (buffer_too_large)
  89                 DEBUG(5,("send_trans_reply: buffer %d too large\n", ldata ));
  90
  91         this_lparam = MIN(lparam,max_send - 500); /* hack */
  92         this_ldata  = MIN(ldata,max_send - (500+this_lparam));
  93
  94         align = ((this_lparam)%4);
  95
  96         if (buffer_too_large) {
  97                 ERROR_BOTH(STATUS_BUFFER_OVERFLOW,ERRDOS,ERRmoredata);
  98         }
  99
 100         set_message(outbuf,10,1+align+this_ldata+this_lparam,True);
 101
 102         copy_trans_params_and_data(outbuf, align,
 103                                                                 rparam, tot_param_sent, this_lparam,
 104                                                                 rdata, tot_data_sent, this_ldata);
 105
 106         SSVAL(outbuf,smb_vwv0,lparam);
 107         SSVAL(outbuf,smb_vwv1,ldata);
 108         SSVAL(outbuf,smb_vwv3,this_lparam);
 109         SSVAL(outbuf,smb_vwv4,smb_offset(smb_buf(outbuf)+1,outbuf));
 110         SSVAL(outbuf,smb_vwv5,0);
 111         SSVAL(outbuf,smb_vwv6,this_ldata);
 112         SSVAL(outbuf,smb_vwv7,smb_offset(smb_buf(outbuf)+1+this_lparam+align,outbuf));
 113         SSVAL(outbuf,smb_vwv8,0);
 114         SSVAL(outbuf,smb_vwv9,0);
 115
 116         show_msg(outbuf);
 117         if (!send_smb(smbd_server_fd(),outbuf))
 118                 exit_server("send_trans_reply: send_smb failed.");
 119
 120         tot_data_sent = this_ldata;
 121         tot_param_sent = this_lparam;
 122
 123         while (tot_data_sent < ldata || tot_param_sent < lparam)
 124         {
 125                 this_lparam = MIN(lparam-tot_param_sent, max_send - 500); /* hack */
 126                 this_ldata  = MIN(ldata -tot_data_sent, max_send - (500+this_lparam));
 127
 128                 if(this_lparam < 0)
 129                         this_lparam = 0;
 130
 131                 if(this_ldata < 0)
 132                         this_ldata = 0;
 133
 134                 align = (this_lparam%4);
 135
 136                 set_message(outbuf,10,1+this_ldata+this_lparam+align,False);
 137
 138                 copy_trans_params_and_data(outbuf, align,
 139                                            rparam, tot_param_sent, this_lparam,
 140                                            rdata, tot_data_sent, this_ldata);
 141
 142                 SSVAL(outbuf,smb_vwv3,this_lparam);
 143                 SSVAL(outbuf,smb_vwv4,smb_offset(smb_buf(outbuf)+1,outbuf));
 144                 SSVAL(outbuf,smb_vwv5,tot_param_sent);
 145                 SSVAL(outbuf,smb_vwv6,this_ldata);
 146                 SSVAL(outbuf,smb_vwv7,smb_offset(smb_buf(outbuf)+1+this_lparam+align,outbuf));
 147                 SSVAL(outbuf,smb_vwv8,tot_data_sent);
 148                 SSVAL(outbuf,smb_vwv9,0);
 149
 150                 show_msg(outbuf);
 151                 if (!send_smb(smbd_server_fd(),outbuf))
 152                         exit_server("send_trans_reply: send_smb failed.");
 153
 154                 tot_data_sent  += this_ldata;
 155                 tot_param_sent += this_lparam;
 156         }
 157 }
 158
 159 /****************************************************************************
 160  Start the first part of an RPC reply which began with an SMBtrans request.
 161 ****************************************************************************/
 162
 163 static BOOL api_rpc_trans_reply(char *outbuf, smb_np_struct *p)
 164 {
 165         BOOL is_data_outstanding;
 166         char *rdata = (char *)SMB_MALLOC(p->max_trans_reply);
 167         int data_len;
 168
 169         if(rdata == NULL) {
 170                 DEBUG(0,("api_rpc_trans_reply: malloc fail.\n"));
 171                 return False;
 172         }
 173
 174         if((data_len = read_from_pipe( p, rdata, p->max_trans_reply,
 175                                         &is_data_outstanding)) < 0) {
 176                 SAFE_FREE(rdata);
 177                 return False;
 178         }
 179
 180         send_trans_reply(outbuf, NULL, 0, rdata, data_len, is_data_outstanding);
 181
 182         SAFE_FREE(rdata);
 183         return True;
 184 }
 185
 186 /****************************************************************************
 187  WaitNamedPipeHandleState
 188 ****************************************************************************/
 189
 190 static BOOL api_WNPHS(char *outbuf, smb_np_struct *p, char *param, int param_len)
 191 {
 192         uint16 priority;
 193
 194         if (!param || param_len < 2)
 195                 return False;
 196
 197         priority = SVAL(param,0);
 198         DEBUG(4,("WaitNamedPipeHandleState priority %x\n", priority));
 199
 200         if (wait_rpc_pipe_hnd_state(p, priority)) {
 201                 /* now send the reply */
 202                 send_trans_reply(outbuf, NULL, 0, NULL, 0, False);
 203                 return True;
 204         }
 205         return False;
 206 }
 207
 208
 209 /****************************************************************************
 210  SetNamedPipeHandleState
 211 ****************************************************************************/
 212
 213 static BOOL api_SNPHS(char *outbuf, smb_np_struct *p, char *param, int param_len)
 214 {
 215         uint16 id;
 216
 217         if (!param || param_len < 2)
 218                 return False;
 219
 220         id = SVAL(param,0);
 221         DEBUG(4,("SetNamedPipeHandleState to code %x\n", id));
 222
 223         if (set_rpc_pipe_hnd_state(p, id)) {
 224                 /* now send the reply */
 225                 send_trans_reply(outbuf, NULL, 0, NULL, 0, False);
 226                 return True;
 227         }
 228         return False;
 229 }
 230
 231
 232 /****************************************************************************
 233  When no reply is generated, indicate unsupported.
 234  ****************************************************************************/
 235
 236 static BOOL api_no_reply(char *outbuf, int max_rdata_len)
 237 {
 238         char rparam[4];
 239
 240         /* unsupported */
 241         SSVAL(rparam,0,NERR_notsupported);
 242         SSVAL(rparam,2,0); /* converter word */
 243
 244         DEBUG(3,("Unsupported API fd command\n"));
 245
 246         /* now send the reply */
 247         send_trans_reply(outbuf, rparam, 4, NULL, 0, False);
 248
 249         return -1;
 250 }
 251
 252 /****************************************************************************
 253  Handle remote api calls delivered to a named pipe already opened.
 254  ****************************************************************************/
 255
 256 static int api_fd_reply(connection_struct *conn,uint16 vuid,char *outbuf,
 257                         uint16 *setup,char *data,char *params,
 258                         int suwcnt,int tdscnt,int tpscnt,int mdrcnt,int mprcnt)
 259 {
 260         BOOL reply = False;
 261         smb_np_struct *p = NULL;
 262         int pnum;
 263         int subcommand;
 264
 265         DEBUG(5,("api_fd_reply\n"));
 266
 267         /* First find out the name of this file. */
 268         if (suwcnt != 2) {
 269                 DEBUG(0,("Unexpected named pipe transaction.\n"));
 270                 return ERROR_NT(NT_STATUS_INVALID_PARAMETER);
 271         }
 272
 273         /* Get the file handle and hence the file name. */
 274         /*
 275          * NB. The setup array has already been transformed
 276          * via SVAL and so is in gost byte order.
 277          */
 278         pnum = ((int)setup[1]) & 0xFFFF;
 279         subcommand = ((int)setup[0]) & 0xFFFF;
 280
 281         if(!(p = get_rpc_pipe(pnum))) {
 282                 if (subcommand == TRANSACT_WAITNAMEDPIPEHANDLESTATE) {
 283                         /* Win9x does this call with a unicode pipe name, not a pnum. */
 284                         /* Just return success for now... */
 285                         DEBUG(3,("Got TRANSACT_WAITNAMEDPIPEHANDLESTATE on text pipe name\n"));
 286                         send_trans_reply(outbuf, NULL, 0, NULL, 0, False);
 287                         return -1;
 288                 }
 289
 290                 DEBUG(1,("api_fd_reply: INVALID PIPE HANDLE: %x\n", pnum));
 291                 return ERROR_NT(NT_STATUS_INVALID_HANDLE);
 292         }
 293
 294         DEBUG(3,("Got API command 0x%x on pipe \"%s\" (pnum %x)\n", subcommand, p->name, pnum));
 295
 296         /* record maximum data length that can be transmitted in an SMBtrans */
 297         p->max_trans_reply = mdrcnt;
 298
 299         DEBUG(10,("api_fd_reply: p:%p max_trans_reply: %d\n", p, p->max_trans_reply));
 300
 301         switch (subcommand) {
 302         case TRANSACT_DCERPCCMD:
 303                 /* dce/rpc command */
 304                 reply = write_to_pipe(p, data, tdscnt);
 305                 if (reply)
 306                         reply = api_rpc_trans_reply(outbuf, p);
 307                 break;
 308         case TRANSACT_WAITNAMEDPIPEHANDLESTATE:
 309                 /* Wait Named Pipe Handle state */
 310                 reply = api_WNPHS(outbuf, p, params, tpscnt);
 311                 break;
 312         case TRANSACT_SETNAMEDPIPEHANDLESTATE:
 313                 /* Set Named Pipe Handle state */
 314                 reply = api_SNPHS(outbuf, p, params, tpscnt);
 315                 break;
 316         default:
 317                 return ERROR_NT(NT_STATUS_INVALID_PARAMETER);
 318         }
 319
 320         if (!reply)
 321                 return api_no_reply(outbuf, mdrcnt);
 322
 323         return -1;
 324 }
 325
 326 /****************************************************************************
 327   handle named pipe commands
 328   ****************************************************************************/
 329 static int named_pipe(connection_struct *conn,uint16 vuid, char *outbuf,char *name,
 330                       uint16 *setup,char *data,char *params,
 331                       int suwcnt,int tdscnt,int tpscnt,
 332                       int msrcnt,int mdrcnt,int mprcnt)
 333 {
 334         DEBUG(3,("named pipe command on <%s> name\n", name));
 335
 336         if (strequal(name,"LANMAN"))
 337                 return api_reply(conn,vuid,outbuf,data,params,tdscnt,tpscnt,mdrcnt,mprcnt);
 338
 339         if (strequal(name,"WKSSVC") ||
 340             strequal(name,"SRVSVC") ||
 341             strequal(name,"WINREG") ||
 342             strequal(name,"SAMR") ||
 343             strequal(name,"LSARPC"))
 344         {
 345                 DEBUG(4,("named pipe command from Win95 (wow!)\n"));
 346                 return api_fd_reply(conn,vuid,outbuf,setup,data,params,suwcnt,tdscnt,tpscnt,mdrcnt,mprcnt);
 347         }
 348
 349         if (strlen(name) < 1)
 350                 return api_fd_reply(conn,vuid,outbuf,setup,data,params,suwcnt,tdscnt,tpscnt,mdrcnt,mprcnt);
 351
 352         if (setup)
 353                 DEBUG(3,("unknown named pipe: setup 0x%X setup1=%d\n", (int)setup[0],(int)setup[1]));
 354
 355         return 0;
 356 }
 357
 358 static NTSTATUS handle_trans(connection_struct *conn,
 359                              struct trans_state *state,
 360                              char *outbuf, int *outsize)
 361 {
 362         char *local_machine_name;
 363         int name_offset = 0;
 364
 365         DEBUG(3,("trans <%s> data=%u params=%u setup=%u\n",
 366                  state->name,state->total_data,state->total_param,
 367                  state->setup_count));
 368
 369         /*
 370          * WinCE wierdness....
 371          */
 372
 373         local_machine_name = talloc_asprintf(state, "\\%s\\",
 374                                              get_local_machine_name());
 375
 376         if (local_machine_name == NULL) {
 377                 return NT_STATUS_NO_MEMORY;
 378         }
 379
 380         if (strnequal(state->name, local_machine_name,
 381                       strlen(local_machine_name))) {
 382                 name_offset = strlen(local_machine_name)-1;
 383         }
 384
 385         if (!strnequal(&state->name[name_offset], "\\PIPE",
 386                        strlen("\\PIPE"))) {
 387                 return NT_STATUS_NOT_SUPPORTED;
 388         }
 389
 390         name_offset += strlen("\\PIPE");
 391
 392         /* Win9x weirdness.  When talking to a unicode server Win9x
 393            only sends \PIPE instead of \PIPE\ */
 394
 395         if (state->name[name_offset] == '\\')
 396                 name_offset++;
 397
 398         DEBUG(5,("calling named_pipe\n"));
 399         *outsize = named_pipe(conn, state->vuid, outbuf,
 400                               state->name+name_offset,
 401                               state->setup,state->data,
 402                               state->param,
 403                               state->setup_count,state->total_data,
 404                               state->total_param,
 405                               state->max_setup_return,
 406                               state->max_data_return,
 407                               state->max_param_return);
 408
 409         if (*outsize == 0) {
 410                 return NT_STATUS_NOT_SUPPORTED;
 411         }
 412
 413         if (state->close_on_completion)
 414                 close_cnum(conn,state->vuid);
 415
 416         return NT_STATUS_OK;
 417 }
 418
 419 /****************************************************************************
 420  Reply to a SMBtrans.
 421  ****************************************************************************/
 422
 423 int reply_trans(connection_struct *conn, char *inbuf,char *outbuf,
 424                 int size, int bufsize)
 425 {
 426         int outsize = 0;
 427         unsigned int dsoff = SVAL(inbuf, smb_dsoff);
 428         unsigned int dscnt = SVAL(inbuf, smb_dscnt);
 429         unsigned int psoff = SVAL(inbuf, smb_psoff);
 430         unsigned int pscnt = SVAL(inbuf, smb_pscnt);
 431         struct trans_state *state;
 432         NTSTATUS result;
 433
 434         START_PROFILE(SMBtrans);
 435
 436         result = allow_new_trans(conn->pending_trans, SVAL(inbuf, smb_mid));
 437         if (!NT_STATUS_IS_OK(result)) {
 438                 DEBUG(2, ("Got invalid trans request: %s\n",
 439                           nt_errstr(result)));
 440                 END_PROFILE(SMBtrans);
 441                 return ERROR_NT(result);
 442         }
 443
 444         if ((state = TALLOC_P(NULL, struct trans_state)) == NULL) {
 445                 DEBUG(0, ("talloc failed\n"));
 446                 END_PROFILE(SMBtrans);
 447                 return ERROR_NT(NT_STATUS_NO_MEMORY);
 448         }
 449
 450         state->cmd = SMBtrans;
 451
 452         state->mid = SVAL(inbuf, smb_mid);
 453         state->vuid = SVAL(inbuf, smb_uid);
 454         state->setup_count = CVAL(inbuf, smb_suwcnt);
 455         state->total_param = SVAL(inbuf, smb_tpscnt);
 456         state->param = NULL;
 457         state->total_data = SVAL(inbuf, smb_tdscnt);
 458         state->data = NULL;
 459         state->max_param_return = SVAL(inbuf, smb_mprcnt);
 460         state->max_data_return = SVAL(inbuf, smb_mdrcnt);
 461         state->max_setup_return = CVAL(inbuf, smb_msrcnt);
 462         state->close_on_completion = BITSETW(inbuf+smb_vwv5,0);
 463         state->one_way = BITSETW(inbuf+smb_vwv5,1);
 464
 465         memset(state->name, '\0',sizeof(state->name));
 466         srvstr_pull_buf(inbuf, state->name, smb_buf(inbuf),
 467                         sizeof(state->name), STR_TERMINATE);
 468
 469         if ((dscnt > state->total_data) || (pscnt > state->total_param))
 470                 goto bad_param;
 471
 472         if (state->total_data)  {
 473                 /* Can't use talloc here, the core routines do realloc on the
 474                  * params and data. */
 475                 state->data = SMB_MALLOC(state->total_data);
 476                 if (state->data == NULL) {
 477                         DEBUG(0,("reply_trans: data malloc fail for %u "
 478                                  "bytes !\n", state->total_data));
 479                         TALLOC_FREE(state);
 480                         END_PROFILE(SMBtrans);
 481                         return(ERROR_DOS(ERRDOS,ERRnomem));
 482                 }
 483                 if ((dsoff+dscnt < dsoff) || (dsoff+dscnt < dscnt))
 484                         goto bad_param;
 485                 if ((smb_base(inbuf)+dsoff+dscnt > inbuf + size) ||
 486                     (smb_base(inbuf)+dsoff+dscnt < smb_base(inbuf)))
 487                         goto bad_param;
 488
 489                 memcpy(state->data,smb_base(inbuf)+dsoff,dscnt);
 490         }
 491
 492         if (state->total_param) {
 493                 /* Can't use talloc here, the core routines do realloc on the
 494                  * params and data. */
 495                 state->param = SMB_MALLOC(state->total_param);
 496                 if (state->param == NULL) {
 497                         DEBUG(0,("reply_trans: param malloc fail for %u "
 498                                  "bytes !\n", state->total_param));
 499                         SAFE_FREE(state->data);
 500                         TALLOC_FREE(state);
 501                         END_PROFILE(SMBtrans);
 502                         return(ERROR_DOS(ERRDOS,ERRnomem));
 503                 }
 504                 if ((psoff+pscnt < psoff) || (psoff+pscnt < pscnt))
 505                         goto bad_param;
 506                 if ((smb_base(inbuf)+psoff+pscnt > inbuf + size) ||
 507                     (smb_base(inbuf)+psoff+pscnt < smb_base(inbuf)))
 508                         goto bad_param;
 509
 510                 memcpy(state->param,smb_base(inbuf)+psoff,pscnt);
 511         }
 512
 513         state->received_data  = dscnt;
 514         state->received_param = pscnt;
 515
 516         if (state->setup_count) {
 517                 unsigned int i;
 518                 if((state->setup = TALLOC_ARRAY(
 519                             state, uint16, state->setup_count)) == NULL) {
 520                         DEBUG(0,("reply_trans: setup malloc fail for %u "
 521                                  "bytes !\n", (unsigned int)
 522                                  (state->setup_count * sizeof(uint16))));
 523                         TALLOC_FREE(state);
 524                         END_PROFILE(SMBtrans);
 525                         return(ERROR_DOS(ERRDOS,ERRnomem));
 526                 }
 527                 if (inbuf+smb_vwv14+(state->setup_count*SIZEOFWORD) >
 528                     inbuf + size)
 529                         goto bad_param;
 530                 if ((smb_vwv14+(state->setup_count*SIZEOFWORD) < smb_vwv14) ||
 531                     (smb_vwv14+(state->setup_count*SIZEOFWORD) <
 532                      (state->setup_count*SIZEOFWORD)))
 533                         goto bad_param;
 534
 535                 for (i=0;i<state->setup_count;i++)
 536                         state->setup[i] = SVAL(inbuf,smb_vwv14+i*SIZEOFWORD);
 537         }
 538
 539         state->received_param = pscnt;
 540
 541         if ((state->received_param == state->total_param) &&
 542             (state->received_data == state->total_data)) {
 543
 544                 result = handle_trans(conn, state, outbuf, &outsize);
 545
 546                 SAFE_FREE(state->data);
 547                 SAFE_FREE(state->param);
 548                 TALLOC_FREE(state);
 549
 550                 if (!NT_STATUS_IS_OK(result)) {
 551                         END_PROFILE(SMBtrans);
 552                         return ERROR_NT(result);
 553                 }
 554
 555                 if (outsize == 0) {
 556                         END_PROFILE(SMBtrans);
 557                         return ERROR_NT(NT_STATUS_INTERNAL_ERROR);
 558                 }
 559
 560                 END_PROFILE(SMBtrans);
 561                 return outsize;
 562         }
 563
 564         DLIST_ADD(conn->pending_trans, state);
 565
 566         /* We need to send an interim response then receive the rest
 567            of the parameter/data bytes */
 568         outsize = set_message(outbuf,0,0,True);
 569         show_msg(outbuf);
 570         END_PROFILE(SMBtrans);
 571         return outsize;
 572
 573   bad_param:
 574
 575         DEBUG(0,("reply_trans: invalid trans parameters\n"));
 576         SAFE_FREE(state->data);
 577         SAFE_FREE(state->param);
 578         TALLOC_FREE(state);
 579         END_PROFILE(SMBtrans);
 580         return ERROR_NT(NT_STATUS_INVALID_PARAMETER);
 581 }
 582
 583 /****************************************************************************
 584  Reply to a secondary SMBtrans.
 585  ****************************************************************************/
 586
 587 int reply_transs(connection_struct *conn, char *inbuf,char *outbuf,
 588                  int size, int bufsize)
 589 {
 590         int outsize = 0;
 591         unsigned int pcnt,poff,dcnt,doff,pdisp,ddisp;
 592         struct trans_state *state;
 593         NTSTATUS result;
 594
 595         START_PROFILE(SMBtranss);
 596
 597         show_msg(inbuf);
 598
 599         for (state = conn->pending_trans; state != NULL;
 600              state = state->next) {
 601                 if (state->mid == SVAL(inbuf,smb_mid)) {
 602                         break;
 603                 }
 604         }
 605
 606         if ((state == NULL) || (state->cmd != SMBtrans)) {
 607                 END_PROFILE(SMBtranss);
 608                 return ERROR_NT(NT_STATUS_INVALID_PARAMETER);
 609         }
 610
 611         /* Revise total_params and total_data in case they have changed
 612          * downwards */
 613
 614         if (SVAL(inbuf, smb_vwv0) < state->total_param)
 615                 state->total_param = SVAL(inbuf,smb_vwv0);
 616         if (SVAL(inbuf, smb_vwv1) < state->total_data)
 617                 state->total_data = SVAL(inbuf,smb_vwv1);
 618
 619         pcnt = SVAL(inbuf, smb_spscnt);
 620         poff = SVAL(inbuf, smb_spsoff);
 621         pdisp = SVAL(inbuf, smb_spsdisp);
 622
 623         dcnt = SVAL(inbuf, smb_sdscnt);
 624         doff = SVAL(inbuf, smb_sdsoff);
 625         ddisp = SVAL(inbuf, smb_sdsdisp);
 626
 627         state->received_param += pcnt;
 628         state->received_data += dcnt;
 629
 630         if ((state->received_data > state->total_data) ||
 631             (state->received_param > state->total_param))
 632                 goto bad_param;
 633
 634         if (pcnt) {
 635                 if (pdisp+pcnt > state->total_param)
 636                         goto bad_param;
 637                 if ((pdisp+pcnt < pdisp) || (pdisp+pcnt < pcnt))
 638                         goto bad_param;
 639                 if (pdisp > state->total_param)
 640                         goto bad_param;
 641                 if ((smb_base(inbuf) + poff + pcnt > inbuf + size) ||
 642                     (smb_base(inbuf) + poff + pcnt < smb_base(inbuf)))
 643                         goto bad_param;
 644                 if (state->param + pdisp < state->param)
 645                         goto bad_param;
 646
 647                 memcpy(state->param+pdisp,smb_base(inbuf)+poff,
 648                        pcnt);
 649         }
 650
 651         if (dcnt) {
 652                 if (ddisp+dcnt > state->total_data)
 653                         goto bad_param;
 654                 if ((ddisp+dcnt < ddisp) || (ddisp+dcnt < dcnt))
 655                         goto bad_param;
 656                 if (ddisp > state->total_data)
 657                         goto bad_param;
 658                 if ((smb_base(inbuf) + doff + dcnt > inbuf + size) ||
 659                     (smb_base(inbuf) + doff + dcnt < smb_base(inbuf)))
 660                         goto bad_param;
 661                 if (state->data + ddisp < state->data)
 662                         goto bad_param;
 663
 664                 memcpy(state->data+ddisp, smb_base(inbuf)+doff,
 665                        dcnt);
 666         }
 667
 668         if ((state->received_param < state->total_param) ||
 669             (state->received_data < state->total_data)) {
 670                 END_PROFILE(SMBtranss);
 671                 return -1;
 672         }
 673
 674         /* construct_reply_common has done us the favor to pre-fill the
 675          * command field with SMBtranss which is wrong :-)
 676          */
 677         SCVAL(outbuf,smb_com,SMBtrans);
 678
 679         result = handle_trans(conn, state, outbuf, &outsize);
 680
 681         DLIST_REMOVE(conn->pending_trans, state);
 682         SAFE_FREE(state->data);
 683         SAFE_FREE(state->param);
 684         TALLOC_FREE(state);
 685
 686         if ((outsize == 0) || !NT_STATUS_IS_OK(result)) {
 687                 END_PROFILE(SMBtranss);
 688                 return(ERROR_DOS(ERRSRV,ERRnosupport));
 689         }
 690
 691         END_PROFILE(SMBtranss);
 692         return(outsize);
 693
 694   bad_param:
 695
 696         DEBUG(0,("reply_transs: invalid trans parameters\n"));
 697         DLIST_REMOVE(conn->pending_trans, state);
 698         SAFE_FREE(state->data);
 699         SAFE_FREE(state->param);
 700         TALLOC_FREE(state);
 701         END_PROFILE(SMBtranss);
 702         return ERROR_NT(NT_STATUS_INVALID_PARAMETER);
 703 }