source3/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_recieve_smb(), now a static in libsmb/clientgen.c */
 131 /****************************************************************************
 132 Issue a single SMBreadraw and don't wait for a reply.
 133 ****************************************************************************/
 134
 135 static BOOL cli_issue_readraw(struct cli_state *cli, int fnum, off_t offset,
 136                            size_t size, int i)
 137 {
 138         memset(cli->outbuf,'\0',smb_size);
 139         memset(cli->inbuf,'\0',smb_size);
 140
 141         set_message(cli->outbuf,10,0,True);
 142
 143         SCVAL(cli->outbuf,smb_com,SMBreadbraw);
 144         SSVAL(cli->outbuf,smb_tid,cli->cnum);
 145         cli_setup_packet(cli);
 146
 147         SSVAL(cli->outbuf,smb_vwv0,fnum);
 148         SIVAL(cli->outbuf,smb_vwv1,offset);
 149         SSVAL(cli->outbuf,smb_vwv2,size);
 150         SSVAL(cli->outbuf,smb_vwv3,size);
 151         SSVAL(cli->outbuf,smb_mid,cli->mid + i);
 152
 153         return cli_send_smb(cli);
 154 }
 155
 156 /****************************************************************************
 157  Tester for the readraw call.
 158 ****************************************************************************/
 159
 160 ssize_t cli_readraw(struct cli_state *cli, int fnum, char *buf, off_t offset, size_t size)
 161 {
 162         char *p;
 163         int size2;
 164         size_t readsize;
 165         ssize_t total = 0;
 166
 167         if (size == 0)
 168                 return 0;
 169
 170         /*
 171          * Set readsize to the maximum size we can handle in one readraw.
 172          */
 173
 174         readsize = 0xFFFF;
 175
 176         while (total < size) {
 177                 readsize = MIN(readsize, size-total);
 178
 179                 /* Issue a read and receive a reply */
 180
 181                 if (!cli_issue_readraw(cli, fnum, offset, readsize, 0))
 182                         return -1;
 183
 184                 if (!client_receive_smb(cli->fd, cli->inbuf, cli->timeout))
 185                         return -1;
 186
 187                 size2 = smb_len(cli->inbuf);
 188
 189                 if (size2 > readsize) {
 190                         DEBUG(5,("server returned more than we wanted!\n"));
 191                         return -1;
 192                 } else if (size2 < 0) {
 193                         DEBUG(5,("read return < 0!\n"));
 194                         return -1;
 195                 }
 196
 197                 /* Copy data into buffer */
 198
 199                 if (size2) {
 200                         p = cli->inbuf + 4;
 201                         memcpy(buf + total, p, size2);
 202                 }
 203
 204                 total += size2;
 205                 offset += size2;
 206
 207                 /*
 208                  * If the server returned less than we asked for we're at EOF.
 209                  */
 210
 211                 if (size2 < readsize)
 212                         break;
 213         }
 214
 215         return total;
 216 }
 217 #endif
 218 /****************************************************************************
 219 issue a single SMBwrite and don't wait for a reply
 220 ****************************************************************************/
 221
 222 static BOOL cli_issue_write(struct cli_state *cli, int fnum, off_t offset, uint16 mode, char *buf,
 223                             size_t size, int i)
 224 {
 225         char *p;
 226
 227         if (size > cli->bufsize) {
 228                 cli->outbuf = realloc(cli->outbuf, size + 1024);
 229                 cli->inbuf = realloc(cli->inbuf, size + 1024);
 230                 if (cli->outbuf == NULL || cli->inbuf == NULL)
 231                         return False;
 232                 cli->bufsize = size + 1024;
 233         }
 234
 235         memset(cli->outbuf,'\0',smb_size);
 236         memset(cli->inbuf,'\0',smb_size);
 237
 238         if (size > 0xFFFF)
 239                 set_message(cli->outbuf,14,0,True);
 240         else
 241                 set_message(cli->outbuf,12,0,True);
 242
 243         SCVAL(cli->outbuf,smb_com,SMBwriteX);
 244         SSVAL(cli->outbuf,smb_tid,cli->cnum);
 245         cli_setup_packet(cli);
 246
 247         SCVAL(cli->outbuf,smb_vwv0,0xFF);
 248         SSVAL(cli->outbuf,smb_vwv2,fnum);
 249
 250         SIVAL(cli->outbuf,smb_vwv3,offset);
 251         SIVAL(cli->outbuf,smb_vwv5,(mode & 0x0008) ? 0xFFFFFFFF : 0);
 252         SSVAL(cli->outbuf,smb_vwv7,mode);
 253
 254         SSVAL(cli->outbuf,smb_vwv8,(mode & 0x0008) ? size : 0);
 255         SSVAL(cli->outbuf,smb_vwv9,((size>>16)&1));
 256         SSVAL(cli->outbuf,smb_vwv10,size);
 257         SSVAL(cli->outbuf,smb_vwv11,
 258               smb_buf(cli->outbuf) - smb_base(cli->outbuf));
 259
 260         p = smb_base(cli->outbuf) + SVAL(cli->outbuf,smb_vwv11);
 261         memcpy(p, buf, size);
 262         cli_setup_bcc(cli, p+size);
 263
 264         SSVAL(cli->outbuf,smb_mid,cli->mid + i);
 265
 266         show_msg(cli->outbuf);
 267         return cli_send_smb(cli);
 268 }
 269
 270 /****************************************************************************
 271   write to a file
 272   write_mode: 0x0001 disallow write cacheing
 273               0x0002 return bytes remaining
 274               0x0004 use raw named pipe protocol
 275               0x0008 start of message mode named pipe protocol
 276 ****************************************************************************/
 277
 278 ssize_t cli_write(struct cli_state *cli,
 279                   int fnum, uint16 write_mode,
 280                   char *buf, off_t offset, size_t size)
 281 {
 282         int bwritten = 0;
 283         int issued = 0;
 284         int received = 0;
 285         int mpx = MAX(cli->max_mux-1, 1);
 286         int block = (cli->max_xmit - (smb_size+32)) & ~1023;
 287         int blocks = (size + (block-1)) / block;
 288
 289         while (received < blocks) {
 290
 291                 while ((issued - received < mpx) && (issued < blocks)) {
 292                         int bsent = issued * block;
 293                         int size1 = MIN(block, size - bsent);
 294
 295                         if (!cli_issue_write(cli, fnum, offset + bsent,
 296                                         write_mode,
 297                                         buf + bsent,
 298                                         size1, issued))
 299                                 return -1;
 300                         issued++;
 301                 }
 302
 303                 if (!cli_receive_smb(cli))
 304                         return bwritten;
 305
 306                 received++;
 307
 308                 if (cli_is_error(cli))
 309                         break;
 310
 311                 bwritten += SVAL(cli->inbuf, smb_vwv2);
 312                 bwritten += (((int)(SVAL(cli->inbuf, smb_vwv4)))>>16);
 313         }
 314
 315         while (received < issued && cli_receive_smb(cli))
 316                 received++;
 317
 318         return bwritten;
 319 }
 320
 321 /****************************************************************************
 322   write to a file using a SMBwrite and not bypassing 0 byte writes
 323 ****************************************************************************/
 324
 325 ssize_t cli_smbwrite(struct cli_state *cli,
 326                      int fnum, char *buf, off_t offset, size_t size1)
 327 {
 328         char *p;
 329         ssize_t total = 0;
 330
 331         do {
 332                 size_t size = MIN(size1, cli->max_xmit - 48);
 333
 334                 memset(cli->outbuf,'\0',smb_size);
 335                 memset(cli->inbuf,'\0',smb_size);
 336
 337                 set_message(cli->outbuf,5, 0,True);
 338
 339                 SCVAL(cli->outbuf,smb_com,SMBwrite);
 340                 SSVAL(cli->outbuf,smb_tid,cli->cnum);
 341                 cli_setup_packet(cli);
 342
 343                 SSVAL(cli->outbuf,smb_vwv0,fnum);
 344                 SSVAL(cli->outbuf,smb_vwv1,size);
 345                 SIVAL(cli->outbuf,smb_vwv2,offset);
 346                 SSVAL(cli->outbuf,smb_vwv4,0);
 347
 348                 p = smb_buf(cli->outbuf);
 349                 *p++ = 1;
 350                 SSVAL(p, 0, size); p += 2;
 351                 memcpy(p, buf, size); p += size;
 352
 353                 cli_setup_bcc(cli, p);
 354
 355                 if (!cli_send_smb(cli))
 356                         return -1;
 357
 358                 if (!cli_receive_smb(cli))
 359                         return -1;
 360
 361                 if (cli_is_error(cli))
 362                         return -1;
 363
 364                 size = SVAL(cli->inbuf,smb_vwv0);
 365                 if (size == 0)
 366                         break;
 367
 368                 size1 -= size;
 369                 total += size;
 370                 offset += size;
 371
 372         } while (size1);
 373
 374         return total;
 375 }