source/libsmb/clireadwrite.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    client file read/write routines
   4    Copyright (C) Andrew Tridgell 1994-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23 /****************************************************************************
  24 Issue a single SMBread and don't wait for a reply.
  25 ****************************************************************************/
  26
  27 static BOOL cli_issue_read(struct cli_state *cli, int fnum, off_t offset,
  28                            size_t size, int i)
  29 {
  30         BOOL bigoffset = False;
  31
  32         memset(cli->outbuf,'\0',smb_size);
  33         memset(cli->inbuf,'\0',smb_size);
  34
  35         if ((SMB_BIG_UINT)offset >> 32)
  36                 bigoffset = True;
  37
  38         set_message(cli->outbuf,bigoffset ? 12 : 10,0,True);
  39
  40         SCVAL(cli->outbuf,smb_com,SMBreadX);
  41         SSVAL(cli->outbuf,smb_tid,cli->cnum);
  42         cli_setup_packet(cli);
  43
  44         SCVAL(cli->outbuf,smb_vwv0,0xFF);
  45         SSVAL(cli->outbuf,smb_vwv2,fnum);
  46         SIVAL(cli->outbuf,smb_vwv3,offset);
  47         SSVAL(cli->outbuf,smb_vwv5,size);
  48         SSVAL(cli->outbuf,smb_vwv6,size);
  49         SSVAL(cli->outbuf,smb_vwv7,((size >> 16) & 1));
  50         SSVAL(cli->outbuf,smb_mid,cli->mid + i);
  51
  52         if (bigoffset) {
  53                 SIVAL(cli->outbuf,smb_vwv10,(((SMB_BIG_UINT)offset)>>32) & 0xffffffff);
  54         }
  55
  56         return cli_send_smb(cli);
  57 }
  58
  59 /****************************************************************************
  60   Read size bytes at offset offset using SMBreadX.
  61 ****************************************************************************/
  62
  63 ssize_t cli_read(struct cli_state *cli, int fnum, char *buf, off_t offset, size_t size)
  64 {
  65         char *p;
  66         int size2;
  67         int readsize;
  68         ssize_t total = 0;
  69
  70         if (size == 0)
  71                 return 0;
  72
  73         /*
  74          * Set readsize to the maximum size we can handle in one readX,
  75          * rounded down to a multiple of 1024.
  76          */
  77
  78         if (cli->capabilities & CAP_LARGE_READX) {
  79                 readsize = CLI_MAX_LARGE_READX_SIZE;
  80         } else {
  81                 readsize = (cli->max_xmit - (smb_size+32)) & ~1023;
  82         }
  83
  84         while (total < size) {
  85                 readsize = MIN(readsize, size-total);
  86
  87                 /* Issue a read and receive a reply */
  88
  89                 if (!cli_issue_read(cli, fnum, offset, readsize, 0))
  90                         return -1;
  91
  92                 if (!cli_receive_smb(cli))
  93                         return -1;
  94
  95                 /* Check for error.  Make sure to check for DOS and NT
  96                    errors. */
  97
  98                 if (cli_is_error(cli)) {
  99                         BOOL recoverable_error = False;
 100                         NTSTATUS status = NT_STATUS_OK;
 101                         uint8 eclass = 0;
 102                         uint32 ecode = 0;
 103
 104                         if (cli_is_nt_error(cli))
 105                                 status = cli_nt_error(cli);
 106                         else
 107                                 cli_dos_error(cli, &eclass, &ecode);
 108
 109                         /*
 110                          * ERRDOS ERRmoredata or STATUS_MORE_ENRTIES is a
 111                          * recoverable error, plus we have valid data in the
 112                          * packet so don't error out here.
 113                          */
 114
 115                         if ((eclass == ERRDOS && ecode == ERRmoredata) ||
 116                             NT_STATUS_V(status) == NT_STATUS_V(STATUS_MORE_ENTRIES))
 117                                 recoverable_error = True;
 118
 119                         if (!recoverable_error)
 120                                 return -1;
 121                 }
 122
 123                 size2 = SVAL(cli->inbuf, smb_vwv5);
 124                 size2 |= (((unsigned int)(SVAL(cli->inbuf, smb_vwv7) & 1)) << 16);
 125
 126                 if (size2 > readsize) {
 127                         DEBUG(5,("server returned more than we wanted!\n"));
 128                         return -1;
 129                 } else if (size2 < 0) {
 130                         DEBUG(5,("read return < 0!\n"));
 131                         return -1;
 132                 }
 133
 134                 /* Copy data into buffer */
 135
 136                 p = smb_base(cli->inbuf) + SVAL(cli->inbuf,smb_vwv6);
 137                 memcpy(buf + total, p, size2);
 138
 139                 total += size2;
 140                 offset += size2;
 141
 142                 /*
 143                  * If the server returned less than we asked for we're at EOF.
 144                  */
 145
 146                 if (size2 < readsize)
 147                         break;
 148         }
 149
 150         return total;
 151 }
 152
 153 #if 0  /* relies on client_receive_smb(), now a static in libsmb/clientgen.c */
 154
 155 /* This call is INCOMPATIBLE with SMB signing.  If you remove the #if 0
 156    you must fix ensure you don't attempt to sign the packets - data
 157    *will* be currupted */
 158
 159 /****************************************************************************
 160 Issue a single SMBreadraw and don't wait for a reply.
 161 ****************************************************************************/
 162
 163 static BOOL cli_issue_readraw(struct cli_state *cli, int fnum, off_t offset,
 164                            size_t size, int i)
 165 {
 166
 167         if (!cli->sign_info.use_smb_signing) {
 168                 DEBUG(0, ("Cannot use readraw and SMB Signing\n"));
 169                 return False;
 170         }
 171
 172         memset(cli->outbuf,'\0',smb_size);
 173         memset(cli->inbuf,'\0',smb_size);
 174
 175         set_message(cli->outbuf,10,0,True);
 176
 177         SCVAL(cli->outbuf,smb_com,SMBreadbraw);
 178         SSVAL(cli->outbuf,smb_tid,cli->cnum);
 179         cli_setup_packet(cli);
 180
 181         SSVAL(cli->outbuf,smb_vwv0,fnum);
 182         SIVAL(cli->outbuf,smb_vwv1,offset);
 183         SSVAL(cli->outbuf,smb_vwv2,size);
 184         SSVAL(cli->outbuf,smb_vwv3,size);
 185         SSVAL(cli->outbuf,smb_mid,cli->mid + i);
 186
 187         return cli_send_smb(cli);
 188 }
 189
 190 /****************************************************************************
 191  Tester for the readraw call.
 192 ****************************************************************************/
 193
 194 ssize_t cli_readraw(struct cli_state *cli, int fnum, char *buf, off_t offset, size_t size)
 195 {
 196         char *p;
 197         int size2;
 198         size_t readsize;
 199         ssize_t total = 0;
 200
 201         if (size == 0)
 202                 return 0;
 203
 204         /*
 205          * Set readsize to the maximum size we can handle in one readraw.
 206          */
 207
 208         readsize = 0xFFFF;
 209
 210         while (total < size) {
 211                 readsize = MIN(readsize, size-total);
 212
 213                 /* Issue a read and receive a reply */
 214
 215                 if (!cli_issue_readraw(cli, fnum, offset, readsize, 0))
 216                         return -1;
 217
 218                 if (!client_receive_smb(cli->fd, cli->inbuf, cli->timeout))
 219                         return -1;
 220
 221                 size2 = smb_len(cli->inbuf);
 222
 223                 if (size2 > readsize) {
 224                         DEBUG(5,("server returned more than we wanted!\n"));
 225                         return -1;
 226                 } else if (size2 < 0) {
 227                         DEBUG(5,("read return < 0!\n"));
 228                         return -1;
 229                 }
 230
 231                 /* Copy data into buffer */
 232
 233                 if (size2) {
 234                         p = cli->inbuf + 4;
 235                         memcpy(buf + total, p, size2);
 236                 }
 237
 238                 total += size2;
 239                 offset += size2;
 240
 241                 /*
 242                  * If the server returned less than we asked for we're at EOF.
 243                  */
 244
 245                 if (size2 < readsize)
 246                         break;
 247         }
 248
 249         return total;
 250 }
 251 #endif
 252 /****************************************************************************
 253 issue a single SMBwrite and don't wait for a reply
 254 ****************************************************************************/
 255
 256 static BOOL cli_issue_write(struct cli_state *cli, int fnum, off_t offset,
 257                             uint16 mode, const char *buf,
 258                             size_t size, int i)
 259 {
 260         char *p;
 261         BOOL large_writex = False;
 262
 263         if (size > cli->bufsize) {
 264                 cli->outbuf = SMB_REALLOC(cli->outbuf, size + 1024);
 265                 cli->inbuf = SMB_REALLOC(cli->inbuf, size + 1024);
 266                 if (cli->outbuf == NULL || cli->inbuf == NULL)
 267                         return False;
 268                 cli->bufsize = size + 1024;
 269         }
 270
 271         memset(cli->outbuf,'\0',smb_size);
 272         memset(cli->inbuf,'\0',smb_size);
 273
 274         if (((SMB_BIG_UINT)offset >> 32) || (size > 0xFFFF)) {
 275                 large_writex = True;
 276         }
 277
 278         if (large_writex)
 279                 set_message(cli->outbuf,14,0,True);
 280         else
 281                 set_message(cli->outbuf,12,0,True);
 282
 283         SCVAL(cli->outbuf,smb_com,SMBwriteX);
 284         SSVAL(cli->outbuf,smb_tid,cli->cnum);
 285         cli_setup_packet(cli);
 286
 287         SCVAL(cli->outbuf,smb_vwv0,0xFF);
 288         SSVAL(cli->outbuf,smb_vwv2,fnum);
 289
 290         SIVAL(cli->outbuf,smb_vwv3,offset);
 291         SIVAL(cli->outbuf,smb_vwv5,0);
 292         SSVAL(cli->outbuf,smb_vwv7,mode);
 293
 294         SSVAL(cli->outbuf,smb_vwv8,(mode & 0x0008) ? size : 0);
 295         /*
 296          * According to CIFS-TR-1p00, this following field should only
 297          * be set if CAP_LARGE_WRITEX is set. We should check this
 298          * locally. However, this check might already have been
 299          * done by our callers.
 300          */
 301         SSVAL(cli->outbuf,smb_vwv9,((size>>16)&1));
 302         SSVAL(cli->outbuf,smb_vwv10,size);
 303         SSVAL(cli->outbuf,smb_vwv11,
 304               smb_buf(cli->outbuf) - smb_base(cli->outbuf));
 305
 306         if (large_writex) {
 307                 SIVAL(cli->outbuf,smb_vwv12,(((SMB_BIG_UINT)offset)>>32) & 0xffffffff);
 308         }
 309
 310         p = smb_base(cli->outbuf) + SVAL(cli->outbuf,smb_vwv11);
 311         memcpy(p, buf, size);
 312         cli_setup_bcc(cli, p+size);
 313
 314         SSVAL(cli->outbuf,smb_mid,cli->mid + i);
 315
 316         show_msg(cli->outbuf);
 317         return cli_send_smb(cli);
 318 }
 319
 320 /****************************************************************************
 321   write to a file
 322   write_mode: 0x0001 disallow write cacheing
 323               0x0002 return bytes remaining
 324               0x0004 use raw named pipe protocol
 325               0x0008 start of message mode named pipe protocol
 326 ****************************************************************************/
 327
 328 ssize_t cli_write(struct cli_state *cli,
 329                  int fnum, uint16 write_mode,
 330                  const char *buf, off_t offset, size_t size)
 331 {
 332         ssize_t bwritten = 0;
 333         unsigned int issued = 0;
 334         unsigned int received = 0;
 335         int mpx = 1;
 336         int block = cli->max_xmit - (smb_size+32);
 337         int blocks = (size + (block-1)) / block;
 338
 339         if(cli->max_mux > 1) {
 340                 mpx = cli->max_mux-1;
 341         } else {
 342                 mpx = 1;
 343         }
 344
 345         while (received < blocks) {
 346
 347                 while ((issued - received < mpx) && (issued < blocks)) {
 348                         ssize_t bsent = issued * block;
 349                         ssize_t size1 = MIN(block, size - bsent);
 350
 351                         if (!cli_issue_write(cli, fnum, offset + bsent,
 352                                         write_mode,
 353                                         buf + bsent,
 354                                         size1, issued))
 355                                 return -1;
 356                         issued++;
 357                 }
 358
 359                 if (!cli_receive_smb(cli))
 360                         return bwritten;
 361
 362                 received++;
 363
 364                 if (cli_is_error(cli))
 365                         break;
 366
 367                 bwritten += SVAL(cli->inbuf, smb_vwv2);
 368                 bwritten += (((int)(SVAL(cli->inbuf, smb_vwv4)))<<16);
 369         }
 370
 371         while (received < issued && cli_receive_smb(cli))
 372                 received++;
 373
 374         return bwritten;
 375 }
 376
 377 /****************************************************************************
 378   write to a file using a SMBwrite and not bypassing 0 byte writes
 379 ****************************************************************************/
 380
 381 ssize_t cli_smbwrite(struct cli_state *cli,
 382                      int fnum, char *buf, off_t offset, size_t size1)
 383 {
 384         char *p;
 385         ssize_t total = 0;
 386
 387         do {
 388                 size_t size = MIN(size1, cli->max_xmit - 48);
 389
 390                 memset(cli->outbuf,'\0',smb_size);
 391                 memset(cli->inbuf,'\0',smb_size);
 392
 393                 set_message(cli->outbuf,5, 0,True);
 394
 395                 SCVAL(cli->outbuf,smb_com,SMBwrite);
 396                 SSVAL(cli->outbuf,smb_tid,cli->cnum);
 397                 cli_setup_packet(cli);
 398
 399                 SSVAL(cli->outbuf,smb_vwv0,fnum);
 400                 SSVAL(cli->outbuf,smb_vwv1,size);
 401                 SIVAL(cli->outbuf,smb_vwv2,offset);
 402                 SSVAL(cli->outbuf,smb_vwv4,0);
 403
 404                 p = smb_buf(cli->outbuf);
 405                 *p++ = 1;
 406                 SSVAL(p, 0, size); p += 2;
 407                 memcpy(p, buf, size); p += size;
 408
 409                 cli_setup_bcc(cli, p);
 410
 411                 if (!cli_send_smb(cli))
 412                         return -1;
 413
 414                 if (!cli_receive_smb(cli))
 415                         return -1;
 416
 417                 if (cli_is_error(cli))
 418                         return -1;
 419
 420                 size = SVAL(cli->inbuf,smb_vwv0);
 421                 if (size == 0)
 422                         break;
 423
 424                 size1 -= size;
 425                 total += size;
 426                 offset += size;
 427
 428         } while (size1);
 429
 430         return total;
 431 }