source3/libsmb/clireadwrite.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    client file read/write routines
   5    Copyright (C) Andrew Tridgell 1994-1998
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #define NO_SYSLOG
  23
  24 #include "includes.h"
  25
  26 /****************************************************************************
  27 Issue a single SMBread and don't wait for a reply.
  28 ****************************************************************************/
  29
  30 static BOOL cli_issue_read(struct cli_state *cli, int fnum, off_t offset,
  31                            size_t size, int i)
  32 {
  33         memset(cli->outbuf,'\0',smb_size);
  34         memset(cli->inbuf,'\0',smb_size);
  35
  36         set_message(cli->outbuf,10,0,True);
  37
  38         CVAL(cli->outbuf,smb_com) = SMBreadX;
  39         SSVAL(cli->outbuf,smb_tid,cli->cnum);
  40         cli_setup_packet(cli);
  41
  42         CVAL(cli->outbuf,smb_vwv0) = 0xFF;
  43         SSVAL(cli->outbuf,smb_vwv2,fnum);
  44         SIVAL(cli->outbuf,smb_vwv3,offset);
  45         SSVAL(cli->outbuf,smb_vwv5,size);
  46         SSVAL(cli->outbuf,smb_vwv6,size);
  47         SSVAL(cli->outbuf,smb_mid,cli->mid + i);
  48
  49         return cli_send_smb(cli);
  50 }
  51
  52 /****************************************************************************
  53 Issue a single SMBreadraw and don't wait for a reply.
  54 ****************************************************************************/
  55
  56 static BOOL cli_issue_readraw(struct cli_state *cli, int fnum, off_t offset,
  57                            size_t size, int i)
  58 {
  59         memset(cli->outbuf,'\0',smb_size);
  60         memset(cli->inbuf,'\0',smb_size);
  61
  62         set_message(cli->outbuf,10,0,True);
  63
  64         CVAL(cli->outbuf,smb_com) = SMBreadbraw;
  65         SSVAL(cli->outbuf,smb_tid,cli->cnum);
  66         cli_setup_packet(cli);
  67
  68         SSVAL(cli->outbuf,smb_vwv0,fnum);
  69         SIVAL(cli->outbuf,smb_vwv1,offset);
  70         SSVAL(cli->outbuf,smb_vwv2,size);
  71         SSVAL(cli->outbuf,smb_vwv3,size);
  72         SSVAL(cli->outbuf,smb_mid,cli->mid + i);
  73
  74         return cli_send_smb(cli);
  75 }
  76
  77 /****************************************************************************
  78   Read size bytes at offset offset using SMBreadX.
  79 ****************************************************************************/
  80
  81 ssize_t cli_read(struct cli_state *cli, int fnum, char *buf, off_t offset, size_t size)
  82 {
  83         char *p;
  84         int size2;
  85         int readsize;
  86         ssize_t total = 0;
  87
  88         if (size == 0)
  89                 return 0;
  90
  91         /*
  92          * Set readsize to the maximum size we can handle in one readX,
  93          * rounded down to a multiple of 1024.
  94          */
  95
  96         readsize = (cli->max_xmit - (smb_size+32)) & ~1023;
  97
  98         while (total < size) {
  99                 readsize = MIN(readsize, size-total);
 100
 101                 /* Issue a read and receive a reply */
 102
 103                 if (!cli_issue_read(cli, fnum, offset, readsize, 0))
 104                         return -1;
 105
 106                 if (!cli_receive_smb(cli))
 107                         return -1;
 108
 109                 /* Check for error.  Make sure to check for DOS and NT
 110                    errors. */
 111
 112                 if (cli_is_error(cli)) {
 113                         uint32 status = 0;
 114                         uint8 eclass = 0;
 115
 116                         if (cli_is_nt_error(cli))
 117                                 status = cli_nt_error(cli);
 118                         else
 119                                 cli_dos_error(cli, &eclass, &status);
 120
 121                         if ((eclass == ERRDOS && status == ERRmoredata) ||
 122                             status == STATUS_MORE_ENTRIES)
 123                                 return -1;
 124                 }
 125
 126                 size2 = SVAL(cli->inbuf, smb_vwv5);
 127
 128                 if (size2 > readsize) {
 129                         DEBUG(5,("server returned more than we wanted!\n"));
 130                         return -1;
 131                 } else if (size2 < 0) {
 132                         DEBUG(5,("read return < 0!\n"));
 133                         return -1;
 134                 }
 135
 136                 /* Copy data into buffer */
 137
 138                 p = smb_base(cli->inbuf) + SVAL(cli->inbuf,smb_vwv6);
 139                 memcpy(buf + total, p, size2);
 140
 141                 total += size2;
 142                 offset += size2;
 143
 144                 /*
 145                  * If the server returned less than we asked for we're at EOF.
 146                  */
 147
 148                 if (size2 < readsize)
 149                         break;
 150         }
 151
 152         return total;
 153 }
 154
 155 /****************************************************************************
 156  Tester for the readraw call.
 157 ****************************************************************************/
 158
 159 ssize_t cli_readraw(struct cli_state *cli, int fnum, char *buf, off_t offset, size_t size)
 160 {
 161         char *p;
 162         int size2;
 163         size_t readsize;
 164         ssize_t total = 0;
 165
 166         if (size == 0)
 167                 return 0;
 168
 169         /*
 170          * Set readsize to the maximum size we can handle in one readraw.
 171          */
 172
 173         readsize = 0xFFFF;
 174
 175         while (total < size) {
 176                 readsize = MIN(readsize, size-total);
 177
 178                 /* Issue a read and receive a reply */
 179
 180                 if (!cli_issue_readraw(cli, fnum, offset, readsize, 0))
 181                         return -1;
 182
 183                 if (!client_receive_smb(cli->fd, cli->inbuf, cli->timeout))
 184                         return -1;
 185
 186                 size2 = smb_len(cli->inbuf);
 187
 188                 if (size2 > readsize) {
 189                         DEBUG(5,("server returned more than we wanted!\n"));
 190                         return -1;
 191                 } else if (size2 < 0) {
 192                         DEBUG(5,("read return < 0!\n"));
 193                         return -1;
 194                 }
 195
 196                 /* Copy data into buffer */
 197
 198                 if (size2) {
 199                         p = cli->inbuf + 4;
 200                         memcpy(buf + total, p, size2);
 201                 }
 202
 203                 total += size2;
 204                 offset += size2;
 205
 206                 /*
 207                  * If the server returned less than we asked for we're at EOF.
 208                  */
 209
 210                 if (size2 < readsize)
 211                         break;
 212         }
 213
 214         return total;
 215 }
 216
 217 /****************************************************************************
 218 issue a single SMBwrite and don't wait for a reply
 219 ****************************************************************************/
 220
 221 static BOOL cli_issue_write(struct cli_state *cli, int fnum, off_t offset, uint16 mode, char *buf,
 222                             size_t size, int i)
 223 {
 224         char *p;
 225
 226         memset(cli->outbuf,'\0',smb_size);
 227         memset(cli->inbuf,'\0',smb_size);
 228
 229         if (size > 0xFFFF)
 230                 set_message(cli->outbuf,14,0,True);
 231         else
 232                 set_message(cli->outbuf,12,0,True);
 233
 234         CVAL(cli->outbuf,smb_com) = SMBwriteX;
 235         SSVAL(cli->outbuf,smb_tid,cli->cnum);
 236         cli_setup_packet(cli);
 237
 238         CVAL(cli->outbuf,smb_vwv0) = 0xFF;
 239         SSVAL(cli->outbuf,smb_vwv2,fnum);
 240
 241         SIVAL(cli->outbuf,smb_vwv3,offset);
 242         SIVAL(cli->outbuf,smb_vwv5,(mode & 0x0008) ? 0xFFFFFFFF : 0);
 243         SSVAL(cli->outbuf,smb_vwv7,mode);
 244
 245         SSVAL(cli->outbuf,smb_vwv8,(mode & 0x0008) ? size : 0);
 246         SSVAL(cli->outbuf,smb_vwv9,((size>>16)&1));
 247         SSVAL(cli->outbuf,smb_vwv10,size);
 248         SSVAL(cli->outbuf,smb_vwv11,
 249               smb_buf(cli->outbuf) - smb_base(cli->outbuf));
 250
 251         p = smb_base(cli->outbuf) + SVAL(cli->outbuf,smb_vwv11);
 252         memcpy(p, buf, size);
 253         cli_setup_bcc(cli, p+size);
 254
 255         SSVAL(cli->outbuf,smb_mid,cli->mid + i);
 256
 257         show_msg(cli->outbuf);
 258         return cli_send_smb(cli);
 259 }
 260
 261 /****************************************************************************
 262   write to a file
 263   write_mode: 0x0001 disallow write cacheing
 264               0x0002 return bytes remaining
 265               0x0004 use raw named pipe protocol
 266               0x0008 start of message mode named pipe protocol
 267 ****************************************************************************/
 268
 269 ssize_t cli_write(struct cli_state *cli,
 270                   int fnum, uint16 write_mode,
 271                   char *buf, off_t offset, size_t size)
 272 {
 273         int bwritten = 0;
 274         int issued = 0;
 275         int received = 0;
 276         int mpx = MAX(cli->max_mux-1, 1);
 277         int block = (cli->max_xmit - (smb_size+32)) & ~1023;
 278         int blocks = (size + (block-1)) / block;
 279
 280         while (received < blocks) {
 281
 282                 while ((issued - received < mpx) && (issued < blocks)) {
 283                         int bsent = issued * block;
 284                         int size1 = MIN(block, size - bsent);
 285
 286                         if (!cli_issue_write(cli, fnum, offset + bsent,
 287                                         write_mode,
 288                                         buf + bsent,
 289                                         size1, issued))
 290                                 return -1;
 291                         issued++;
 292                 }
 293
 294                 if (!cli_receive_smb(cli))
 295                         return bwritten;
 296
 297                 received++;
 298
 299                 if (CVAL(cli->inbuf,smb_rcls) != 0)
 300                         break;
 301
 302                 bwritten += SVAL(cli->inbuf, smb_vwv2);
 303         }
 304
 305         while (received < issued && cli_receive_smb(cli))
 306                 received++;
 307
 308         return bwritten;
 309 }
 310
 311 /****************************************************************************
 312   write to a file using a SMBwrite and not bypassing 0 byte writes
 313 ****************************************************************************/
 314
 315 ssize_t cli_smbwrite(struct cli_state *cli,
 316                      int fnum, char *buf, off_t offset, size_t size1)
 317 {
 318         char *p;
 319         ssize_t total = 0;
 320
 321         do {
 322                 size_t size = MIN(size1, cli->max_xmit - 48);
 323
 324                 memset(cli->outbuf,'\0',smb_size);
 325                 memset(cli->inbuf,'\0',smb_size);
 326
 327                 set_message(cli->outbuf,5, 0,True);
 328
 329                 CVAL(cli->outbuf,smb_com) = SMBwrite;
 330                 SSVAL(cli->outbuf,smb_tid,cli->cnum);
 331                 cli_setup_packet(cli);
 332
 333                 SSVAL(cli->outbuf,smb_vwv0,fnum);
 334                 SSVAL(cli->outbuf,smb_vwv1,size);
 335                 SIVAL(cli->outbuf,smb_vwv2,offset);
 336                 SSVAL(cli->outbuf,smb_vwv4,0);
 337
 338                 p = smb_buf(cli->outbuf);
 339                 *p++ = 1;
 340                 SSVAL(p, 0, size); p += 2;
 341                 memcpy(p, buf, size); p += size;
 342
 343                 cli_setup_bcc(cli, p);
 344
 345                 if (!cli_send_smb(cli))
 346                         return -1;
 347
 348                 if (!cli_receive_smb(cli))
 349                         return -1;
 350
 351                 if (CVAL(cli->inbuf,smb_rcls) != 0)
 352                         return -1;
 353
 354                 size = SVAL(cli->inbuf,smb_vwv0);
 355                 if (size == 0)
 356                         break;
 357
 358                 size1 -= size;
 359                 total += size;
 360         } while (size1);
 361
 362         return total;
 363 }