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