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         memset(cli->outbuf,'\0',smb_size);
  33         memset(cli->inbuf,'\0',smb_size);
  34
  35         set_message(cli->outbuf,10,0,True);
  36
  37         SCVAL(cli->outbuf,smb_com,SMBreadX);
  38         SSVAL(cli->outbuf,smb_tid,cli->cnum);
  39         cli_setup_packet(cli);
  40
  41         SCVAL(cli->outbuf,smb_vwv0,0xFF);
  42         SSVAL(cli->outbuf,smb_vwv2,fnum);
  43         SIVAL(cli->outbuf,smb_vwv3,offset);
  44         SSVAL(cli->outbuf,smb_vwv5,size);
  45         SSVAL(cli->outbuf,smb_vwv6,size);
  46         SSVAL(cli->outbuf,smb_mid,cli->mid + i);
  47
  48         return cli_send_smb(cli);
  49 }
  50
  51 /****************************************************************************
  52   Read size bytes at offset offset using SMBreadX.
  53 ****************************************************************************/
  54
  55 ssize_t cli_read(struct cli_state *cli, int fnum, char *buf, off_t offset, size_t size)
  56 {
  57         char *p;
  58         int size2;
  59         int readsize;
  60         ssize_t total = 0;
  61
  62         if (size == 0)
  63                 return 0;
  64
  65         /*
  66          * Set readsize to the maximum size we can handle in one readX,
  67          * rounded down to a multiple of 1024.
  68          */
  69
  70         readsize = (cli->max_xmit - (smb_size+32)) & ~1023;
  71
  72         while (total < size) {
  73                 readsize = MIN(readsize, size-total);
  74
  75                 /* Issue a read and receive a reply */
  76
  77                 if (!cli_issue_read(cli, fnum, offset, readsize, 0))
  78                         return -1;
  79
  80                 if (!cli_receive_smb(cli))
  81                         return -1;
  82
  83                 /* Check for error.  Make sure to check for DOS and NT
  84                    errors. */
  85
  86                 if (cli_is_error(cli)) {
  87                         NTSTATUS status = NT_STATUS_OK;
  88                         uint8 eclass = 0;
  89                         uint32 ecode = 0;
  90
  91                         if (cli_is_nt_error(cli))
  92                                 status = cli_nt_error(cli);
  93                         else
  94                                 cli_dos_error(cli, &eclass, &ecode);
  95
  96                         if ((eclass == ERRDOS && ecode == ERRmoredata) ||
  97                             NT_STATUS_V(status) == NT_STATUS_V(STATUS_MORE_ENTRIES))
  98                                 return -1;
  99                 }
 100
 101                 size2 = SVAL(cli->inbuf, smb_vwv5);
 102
 103                 if (size2 > readsize) {
 104                         DEBUG(5,("server returned more than we wanted!\n"));
 105                         return -1;
 106                 } else if (size2 < 0) {
 107                         DEBUG(5,("read return < 0!\n"));
 108                         return -1;
 109                 }
 110
 111                 /* Copy data into buffer */
 112
 113                 p = smb_base(cli->inbuf) + SVAL(cli->inbuf,smb_vwv6);
 114                 memcpy(buf + total, p, size2);
 115
 116                 total += size2;
 117                 offset += size2;
 118
 119                 /*
 120                  * If the server returned less than we asked for we're at EOF.
 121                  */
 122
 123                 if (size2 < readsize)
 124                         break;
 125         }
 126
 127         return total;
 128 }
 129
 130 #if 0  /* relies on client_receive_smb(), now a static in libsmb/clientgen.c */
 131
 132 /* This call is INCOMPATIBLE with SMB signing.  If you remove the #if 0
 133    you must fix ensure you don't attempt to sign the packets - data
 134    *will* be currupted */
 135
 136 /****************************************************************************
 137 Issue a single SMBreadraw and don't wait for a reply.
 138 ****************************************************************************/
 139
 140 static BOOL cli_issue_readraw(struct cli_state *cli, int fnum, off_t offset,
 141                            size_t size, int i)
 142 {
 143
 144         if (!cli->sign_info.use_smb_signing) {
 145                 DEBUG(0, ("Cannot use readraw and SMB Signing\n"));
 146                 return False;
 147         }
 148
 149         memset(cli->outbuf,'\0',smb_size);
 150         memset(cli->inbuf,'\0',smb_size);
 151
 152         set_message(cli->outbuf,10,0,True);
 153
 154         SCVAL(cli->outbuf,smb_com,SMBreadbraw);
 155         SSVAL(cli->outbuf,smb_tid,cli->cnum);
 156         cli_setup_packet(cli);
 157
 158         SSVAL(cli->outbuf,smb_vwv0,fnum);
 159         SIVAL(cli->outbuf,smb_vwv1,offset);
 160         SSVAL(cli->outbuf,smb_vwv2,size);
 161         SSVAL(cli->outbuf,smb_vwv3,size);
 162         SSVAL(cli->outbuf,smb_mid,cli->mid + i);
 163
 164         return cli_send_smb(cli);
 165 }
 166
 167 /****************************************************************************
 168  Tester for the readraw call.
 169 ****************************************************************************/
 170
 171 ssize_t cli_readraw(struct cli_state *cli, int fnum, char *buf, off_t offset, size_t size)
 172 {
 173         char *p;
 174         int size2;
 175         size_t readsize;
 176         ssize_t total = 0;
 177
 178         if (size == 0)
 179                 return 0;
 180
 181         /*
 182          * Set readsize to the maximum size we can handle in one readraw.
 183          */
 184
 185         readsize = 0xFFFF;
 186
 187         while (total < size) {
 188                 readsize = MIN(readsize, size-total);
 189
 190                 /* Issue a read and receive a reply */
 191
 192                 if (!cli_issue_readraw(cli, fnum, offset, readsize, 0))
 193                         return -1;
 194
 195                 if (!client_receive_smb(cli->fd, cli->inbuf, cli->timeout))
 196                         return -1;
 197
 198                 size2 = smb_len(cli->inbuf);
 199
 200                 if (size2 > readsize) {
 201                         DEBUG(5,("server returned more than we wanted!\n"));
 202                         return -1;
 203                 } else if (size2 < 0) {
 204                         DEBUG(5,("read return < 0!\n"));
 205                         return -1;
 206                 }
 207
 208                 /* Copy data into buffer */
 209
 210                 if (size2) {
 211                         p = cli->inbuf + 4;
 212                         memcpy(buf + total, p, size2);
 213                 }
 214
 215                 total += size2;
 216                 offset += size2;
 217
 218                 /*
 219                  * If the server returned less than we asked for we're at EOF.
 220                  */
 221
 222                 if (size2 < readsize)
 223                         break;
 224         }
 225
 226         return total;
 227 }
 228 #endif
 229 /****************************************************************************
 230 issue a single SMBwrite and don't wait for a reply
 231 ****************************************************************************/
 232
 233 static BOOL cli_issue_write(struct cli_state *cli, int fnum, off_t offset, uint16 mode, char *buf,
 234                             size_t size, int i)
 235 {
 236         char *p;
 237
 238         if (size > cli->bufsize) {
 239                 cli->outbuf = realloc(cli->outbuf, size + 1024);
 240                 cli->inbuf = realloc(cli->inbuf, size + 1024);
 241                 if (cli->outbuf == NULL || cli->inbuf == NULL)
 242                         return False;
 243                 cli->bufsize = size + 1024;
 244         }
 245
 246         memset(cli->outbuf,'\0',smb_size);
 247         memset(cli->inbuf,'\0',smb_size);
 248
 249         if (size > 0xFFFF)
 250                 set_message(cli->outbuf,14,0,True);
 251         else
 252                 set_message(cli->outbuf,12,0,True);
 253
 254         SCVAL(cli->outbuf,smb_com,SMBwriteX);
 255         SSVAL(cli->outbuf,smb_tid,cli->cnum);
 256         cli_setup_packet(cli);
 257
 258         SCVAL(cli->outbuf,smb_vwv0,0xFF);
 259         SSVAL(cli->outbuf,smb_vwv2,fnum);
 260
 261         SIVAL(cli->outbuf,smb_vwv3,offset);
 262         SIVAL(cli->outbuf,smb_vwv5,(mode & 0x0008) ? 0xFFFFFFFF : 0);
 263         SSVAL(cli->outbuf,smb_vwv7,mode);
 264
 265         SSVAL(cli->outbuf,smb_vwv8,(mode & 0x0008) ? size : 0);
 266         SSVAL(cli->outbuf,smb_vwv9,((size>>16)&1));
 267         SSVAL(cli->outbuf,smb_vwv10,size);
 268         SSVAL(cli->outbuf,smb_vwv11,
 269               smb_buf(cli->outbuf) - smb_base(cli->outbuf));
 270
 271         p = smb_base(cli->outbuf) + SVAL(cli->outbuf,smb_vwv11);
 272         memcpy(p, buf, size);
 273         cli_setup_bcc(cli, p+size);
 274
 275         SSVAL(cli->outbuf,smb_mid,cli->mid + i);
 276
 277         show_msg(cli->outbuf);
 278         return cli_send_smb(cli);
 279 }
 280
 281 /****************************************************************************
 282   write to a file
 283   write_mode: 0x0001 disallow write cacheing
 284               0x0002 return bytes remaining
 285               0x0004 use raw named pipe protocol
 286               0x0008 start of message mode named pipe protocol
 287 ****************************************************************************/
 288
 289 ssize_t cli_write(struct cli_state *cli,
 290                   int fnum, uint16 write_mode,
 291                   char *buf, off_t offset, size_t size)
 292 {
 293         int bwritten = 0;
 294         int issued = 0;
 295         int received = 0;
 296         int mpx = MAX(cli->max_mux-1, 1);
 297         int block = (cli->max_xmit - (smb_size+32)) & ~1023;
 298         int blocks = (size + (block-1)) / block;
 299
 300         while (received < blocks) {
 301
 302                 while ((issued - received < mpx) && (issued < blocks)) {
 303                         int bsent = issued * block;
 304                         int size1 = MIN(block, size - bsent);
 305
 306                         if (!cli_issue_write(cli, fnum, offset + bsent,
 307                                         write_mode,
 308                                         buf + bsent,
 309                                         size1, issued))
 310                                 return -1;
 311                         issued++;
 312                 }
 313
 314                 if (!cli_receive_smb(cli))
 315                         return bwritten;
 316
 317                 received++;
 318
 319                 if (cli_is_error(cli))
 320                         break;
 321
 322                 bwritten += SVAL(cli->inbuf, smb_vwv2);
 323                 bwritten += (((int)(SVAL(cli->inbuf, smb_vwv4)))>>16);
 324         }
 325
 326         while (received < issued && cli_receive_smb(cli))
 327                 received++;
 328
 329         return bwritten;
 330 }
 331
 332 /****************************************************************************
 333   write to a file using a SMBwrite and not bypassing 0 byte writes
 334 ****************************************************************************/
 335
 336 ssize_t cli_smbwrite(struct cli_state *cli,
 337                      int fnum, char *buf, off_t offset, size_t size1)
 338 {
 339         char *p;
 340         ssize_t total = 0;
 341
 342         do {
 343                 size_t size = MIN(size1, cli->max_xmit - 48);
 344
 345                 memset(cli->outbuf,'\0',smb_size);
 346                 memset(cli->inbuf,'\0',smb_size);
 347
 348                 set_message(cli->outbuf,5, 0,True);
 349
 350                 SCVAL(cli->outbuf,smb_com,SMBwrite);
 351                 SSVAL(cli->outbuf,smb_tid,cli->cnum);
 352                 cli_setup_packet(cli);
 353
 354                 SSVAL(cli->outbuf,smb_vwv0,fnum);
 355                 SSVAL(cli->outbuf,smb_vwv1,size);
 356                 SIVAL(cli->outbuf,smb_vwv2,offset);
 357                 SSVAL(cli->outbuf,smb_vwv4,0);
 358
 359                 p = smb_buf(cli->outbuf);
 360                 *p++ = 1;
 361                 SSVAL(p, 0, size); p += 2;
 362                 memcpy(p, buf, size); p += size;
 363
 364                 cli_setup_bcc(cli, p);
 365
 366                 if (!cli_send_smb(cli))
 367                         return -1;
 368
 369                 if (!cli_receive_smb(cli))
 370                         return -1;
 371
 372                 if (cli_is_error(cli))
 373                         return -1;
 374
 375                 size = SVAL(cli->inbuf,smb_vwv0);
 376                 if (size == 0)
 377                         break;
 378
 379                 size1 -= size;
 380                 total += size;
 381                 offset += size;
 382
 383         } while (size1);
 384
 385         return total;
 386 }