source/libcli/raw/rawreadwrite.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    client file read/write routines
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) James Myers 2003
   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 3 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, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "libcli/raw/libcliraw.h"
  23
  24 #define SETUP_REQUEST(cmd, wct, buflen) do { \
  25         req = smbcli_request_setup(tree, cmd, wct, buflen); \
  26         if (!req) return NULL; \
  27 } while (0)
  28
  29 /****************************************************************************
  30  low level read operation (async send)
  31 ****************************************************************************/
  32 struct smbcli_request *smb_raw_read_send(struct smbcli_tree *tree, union smb_read *parms)
  33 {
  34         BOOL bigoffset = False;
  35         struct smbcli_request *req = NULL;
  36
  37         switch (parms->generic.level) {
  38         case RAW_READ_READBRAW:
  39                 if (tree->session->transport->negotiate.capabilities & CAP_LARGE_FILES) {
  40                         bigoffset = True;
  41                 }
  42                 SETUP_REQUEST(SMBreadbraw, bigoffset? 10:8, 0);
  43                 SSVAL(req->out.vwv, VWV(0), parms->readbraw.in.file.fnum);
  44                 SIVAL(req->out.vwv, VWV(1), parms->readbraw.in.offset);
  45                 SSVAL(req->out.vwv, VWV(3), parms->readbraw.in.maxcnt);
  46                 SSVAL(req->out.vwv, VWV(4), parms->readbraw.in.mincnt);
  47                 SIVAL(req->out.vwv, VWV(5), parms->readbraw.in.timeout);
  48                 SSVAL(req->out.vwv, VWV(7), 0); /* reserved */
  49                 if (bigoffset) {
  50                         SIVAL(req->out.vwv, VWV(8),parms->readbraw.in.offset>>32);
  51                 }
  52                 break;
  53
  54         case RAW_READ_LOCKREAD:
  55                 SETUP_REQUEST(SMBlockread, 5, 0);
  56                 SSVAL(req->out.vwv, VWV(0), parms->lockread.in.file.fnum);
  57                 SSVAL(req->out.vwv, VWV(1), parms->lockread.in.count);
  58                 SIVAL(req->out.vwv, VWV(2), parms->lockread.in.offset);
  59                 SSVAL(req->out.vwv, VWV(4), parms->lockread.in.remaining);
  60                 break;
  61
  62         case RAW_READ_READ:
  63                 SETUP_REQUEST(SMBread, 5, 0);
  64                 SSVAL(req->out.vwv, VWV(0), parms->read.in.file.fnum);
  65                 SSVAL(req->out.vwv, VWV(1), parms->read.in.count);
  66                 SIVAL(req->out.vwv, VWV(2), parms->read.in.offset);
  67                 SSVAL(req->out.vwv, VWV(4), parms->read.in.remaining);
  68                 break;
  69
  70         case RAW_READ_READX:
  71                 if (tree->session->transport->negotiate.capabilities & CAP_LARGE_FILES) {
  72                         bigoffset = True;
  73                 }
  74                 SETUP_REQUEST(SMBreadX, bigoffset ? 12 : 10, 0);
  75                 SSVAL(req->out.vwv, VWV(0), SMB_CHAIN_NONE);
  76                 SSVAL(req->out.vwv, VWV(1), 0);
  77                 SSVAL(req->out.vwv, VWV(2), parms->readx.in.file.fnum);
  78                 SIVAL(req->out.vwv, VWV(3), parms->readx.in.offset);
  79                 SSVAL(req->out.vwv, VWV(5), parms->readx.in.maxcnt & 0xFFFF);
  80                 SSVAL(req->out.vwv, VWV(6), parms->readx.in.mincnt);
  81                 SIVAL(req->out.vwv, VWV(7), parms->readx.in.maxcnt >> 16);
  82                 SSVAL(req->out.vwv, VWV(9), parms->readx.in.remaining);
  83                 /*
  84                  * TODO: give an error when the offset is 64 bit
  85                  *       and the server doesn't support it
  86                  */
  87                 if (bigoffset) {
  88                         SIVAL(req->out.vwv, VWV(10),parms->readx.in.offset>>32);
  89                 }
  90                 if (parms->readx.in.read_for_execute) {
  91                         uint16_t flags2 = SVAL(req->out.hdr, HDR_FLG2);
  92                         flags2 |= FLAGS2_READ_PERMIT_EXECUTE;
  93                         SSVAL(req->out.hdr, HDR_FLG2, flags2);
  94                 }
  95                 break;
  96
  97         case RAW_READ_SMB2:
  98                 return NULL;
  99         }
 100
 101         if (!smbcli_request_send(req)) {
 102                 smbcli_request_destroy(req);
 103                 return NULL;
 104         }
 105
 106         /* the transport layer needs to know that a readbraw is pending
 107            and handle receives a little differently */
 108         if (parms->generic.level == RAW_READ_READBRAW) {
 109                 tree->session->transport->readbraw_pending = 1;
 110         }
 111
 112         return req;
 113 }
 114
 115 /****************************************************************************
 116  low level read operation (async recv)
 117 ****************************************************************************/
 118 NTSTATUS smb_raw_read_recv(struct smbcli_request *req, union smb_read *parms)
 119 {
 120         if (!smbcli_request_receive(req) ||
 121             smbcli_request_is_error(req)) {
 122                 goto failed;
 123         }
 124
 125         switch (parms->generic.level) {
 126         case RAW_READ_READBRAW:
 127                 parms->readbraw.out.nread = req->in.size - NBT_HDR_SIZE;
 128                 if (parms->readbraw.out.nread >
 129                     MAX(parms->readx.in.mincnt, parms->readx.in.maxcnt)) {
 130                         req->status = NT_STATUS_BUFFER_TOO_SMALL;
 131                         goto failed;
 132                 }
 133                 memcpy(parms->readbraw.out.data, req->in.buffer + NBT_HDR_SIZE, parms->readbraw.out.nread);
 134                 break;
 135
 136         case RAW_READ_LOCKREAD:
 137                 SMBCLI_CHECK_WCT(req, 5);
 138                 parms->lockread.out.nread = SVAL(req->in.vwv, VWV(0));
 139                 if (parms->lockread.out.nread > parms->lockread.in.count ||
 140                     !smbcli_raw_pull_data(req, req->in.data+3,
 141                                        parms->lockread.out.nread, parms->lockread.out.data)) {
 142                         req->status = NT_STATUS_BUFFER_TOO_SMALL;
 143                 }
 144                 break;
 145
 146         case RAW_READ_READ:
 147                 /* there are 4 reserved words in the reply */
 148                 SMBCLI_CHECK_WCT(req, 5);
 149                 parms->read.out.nread = SVAL(req->in.vwv, VWV(0));
 150                 if (parms->read.out.nread > parms->read.in.count ||
 151                     !smbcli_raw_pull_data(req, req->in.data+3,
 152                                        parms->read.out.nread, parms->read.out.data)) {
 153                         req->status = NT_STATUS_BUFFER_TOO_SMALL;
 154                 }
 155                 break;
 156
 157         case RAW_READ_READX:
 158                 /* there are 5 reserved words in the reply */
 159                 SMBCLI_CHECK_WCT(req, 12);
 160                 parms->readx.out.remaining       = SVAL(req->in.vwv, VWV(2));
 161                 parms->readx.out.compaction_mode = SVAL(req->in.vwv, VWV(3));
 162                 parms->readx.out.nread = SVAL(req->in.vwv, VWV(5));
 163
 164                 /* handle oversize replies for non-chained readx replies with
 165                    CAP_LARGE_READX. The snia spec has must to answer for. */
 166                 if ((req->tree->session->transport->negotiate.capabilities & CAP_LARGE_READX)
 167                     && CVAL(req->in.vwv, VWV(0)) == SMB_CHAIN_NONE &&
 168                     req->in.size >= 0x10000) {
 169                         parms->readx.out.nread += (SVAL(req->in.vwv, VWV(7)) << 16);
 170                         if (req->in.hdr + SVAL(req->in.vwv, VWV(6)) +
 171                             parms->readx.out.nread <=
 172                             req->in.buffer + req->in.size) {
 173                                 req->in.data_size += (SVAL(req->in.vwv, VWV(7)) << 16);
 174                         }
 175                 }
 176
 177                 if (parms->readx.out.nread > MAX(parms->readx.in.mincnt, parms->readx.in.maxcnt) ||
 178                     !smbcli_raw_pull_data(req, req->in.hdr + SVAL(req->in.vwv, VWV(6)),
 179                                        parms->readx.out.nread,
 180                                        parms->readx.out.data)) {
 181                         req->status = NT_STATUS_BUFFER_TOO_SMALL;
 182                 }
 183                 break;
 184
 185         case RAW_READ_SMB2:
 186                 req->status = NT_STATUS_INTERNAL_ERROR;
 187                 break;
 188         }
 189
 190 failed:
 191         return smbcli_request_destroy(req);
 192 }
 193
 194 /****************************************************************************
 195  low level read operation (sync interface)
 196 ****************************************************************************/
 197 NTSTATUS smb_raw_read(struct smbcli_tree *tree, union smb_read *parms)
 198 {
 199         struct smbcli_request *req = smb_raw_read_send(tree, parms);
 200         return smb_raw_read_recv(req, parms);
 201 }
 202
 203
 204 /****************************************************************************
 205  raw write interface (async send)
 206 ****************************************************************************/
 207 struct smbcli_request *smb_raw_write_send(struct smbcli_tree *tree, union smb_write *parms)
 208 {
 209         BOOL bigoffset = False;
 210         struct smbcli_request *req = NULL;
 211
 212         switch (parms->generic.level) {
 213         case RAW_WRITE_WRITEUNLOCK:
 214                 SETUP_REQUEST(SMBwriteunlock, 5, 3 + parms->writeunlock.in.count);
 215                 SSVAL(req->out.vwv, VWV(0), parms->writeunlock.in.file.fnum);
 216                 SSVAL(req->out.vwv, VWV(1), parms->writeunlock.in.count);
 217                 SIVAL(req->out.vwv, VWV(2), parms->writeunlock.in.offset);
 218                 SSVAL(req->out.vwv, VWV(4), parms->writeunlock.in.remaining);
 219                 SCVAL(req->out.data, 0, SMB_DATA_BLOCK);
 220                 SSVAL(req->out.data, 1, parms->writeunlock.in.count);
 221                 if (parms->writeunlock.in.count > 0) {
 222                         memcpy(req->out.data+3, parms->writeunlock.in.data,
 223                                parms->writeunlock.in.count);
 224                 }
 225                 break;
 226
 227         case RAW_WRITE_WRITE:
 228                 SETUP_REQUEST(SMBwrite, 5,  3 + parms->write.in.count);
 229                 SSVAL(req->out.vwv, VWV(0), parms->write.in.file.fnum);
 230                 SSVAL(req->out.vwv, VWV(1), parms->write.in.count);
 231                 SIVAL(req->out.vwv, VWV(2), parms->write.in.offset);
 232                 SSVAL(req->out.vwv, VWV(4), parms->write.in.remaining);
 233                 SCVAL(req->out.data, 0, SMB_DATA_BLOCK);
 234                 SSVAL(req->out.data, 1, parms->write.in.count);
 235                 if (parms->write.in.count > 0) {
 236                         memcpy(req->out.data+3, parms->write.in.data, parms->write.in.count);
 237                 }
 238                 break;
 239
 240         case RAW_WRITE_WRITECLOSE:
 241                 SETUP_REQUEST(SMBwriteclose, 6, 1 + parms->writeclose.in.count);
 242                 SSVAL(req->out.vwv, VWV(0), parms->writeclose.in.file.fnum);
 243                 SSVAL(req->out.vwv, VWV(1), parms->writeclose.in.count);
 244                 SIVAL(req->out.vwv, VWV(2), parms->writeclose.in.offset);
 245                 raw_push_dos_date3(tree->session->transport,
 246                                   req->out.vwv, VWV(4), parms->writeclose.in.mtime);
 247                 SCVAL(req->out.data, 0, 0);
 248                 if (parms->writeclose.in.count > 0) {
 249                         memcpy(req->out.data+1, parms->writeclose.in.data,
 250                                parms->writeclose.in.count);
 251                 }
 252                 break;
 253
 254         case RAW_WRITE_WRITEX:
 255                 if (tree->session->transport->negotiate.capabilities & CAP_LARGE_FILES) {
 256                         bigoffset = True;
 257                 }
 258                 SETUP_REQUEST(SMBwriteX, bigoffset ? 14 : 12, parms->writex.in.count);
 259                 SSVAL(req->out.vwv, VWV(0), SMB_CHAIN_NONE);
 260                 SSVAL(req->out.vwv, VWV(1), 0);
 261                 SSVAL(req->out.vwv, VWV(2), parms->writex.in.file.fnum);
 262                 SIVAL(req->out.vwv, VWV(3), parms->writex.in.offset);
 263                 SIVAL(req->out.vwv, VWV(5), 0); /* reserved */
 264                 SSVAL(req->out.vwv, VWV(7), parms->writex.in.wmode);
 265                 SSVAL(req->out.vwv, VWV(8), parms->writex.in.remaining);
 266                 SSVAL(req->out.vwv, VWV(9), parms->writex.in.count>>16);
 267                 SSVAL(req->out.vwv, VWV(10), parms->writex.in.count);
 268                 SSVAL(req->out.vwv, VWV(11), PTR_DIFF(req->out.data, req->out.hdr));
 269                 if (bigoffset) {
 270                         SIVAL(req->out.vwv,VWV(12),parms->writex.in.offset>>32);
 271                 }
 272                 if (parms->writex.in.count > 0) {
 273                         memcpy(req->out.data, parms->writex.in.data, parms->writex.in.count);
 274                 }
 275                 break;
 276
 277         case RAW_WRITE_SPLWRITE:
 278                 SETUP_REQUEST(SMBsplwr, 1, parms->splwrite.in.count);
 279                 SSVAL(req->out.vwv, VWV(0), parms->splwrite.in.file.fnum);
 280                 if (parms->splwrite.in.count > 0) {
 281                         memcpy(req->out.data, parms->splwrite.in.data, parms->splwrite.in.count);
 282                 }
 283                 break;
 284
 285         case RAW_WRITE_SMB2:
 286                 return NULL;
 287         }
 288
 289         if (!smbcli_request_send(req)) {
 290                 smbcli_request_destroy(req);
 291                 return NULL;
 292         }
 293
 294         return req;
 295 }
 296
 297
 298 /****************************************************************************
 299  raw write interface (async recv)
 300 ****************************************************************************/
 301 NTSTATUS smb_raw_write_recv(struct smbcli_request *req, union smb_write *parms)
 302 {
 303         if (!smbcli_request_receive(req) ||
 304             smbcli_request_is_error(req)) {
 305                 goto failed;
 306         }
 307
 308         switch (parms->generic.level) {
 309         case RAW_WRITE_WRITEUNLOCK:
 310                 SMBCLI_CHECK_WCT(req, 1);
 311                 parms->writeunlock.out.nwritten = SVAL(req->in.vwv, VWV(0));
 312                 break;
 313         case RAW_WRITE_WRITE:
 314                 SMBCLI_CHECK_WCT(req, 1);
 315                 parms->write.out.nwritten = SVAL(req->in.vwv, VWV(0));
 316                 break;
 317         case RAW_WRITE_WRITECLOSE:
 318                 SMBCLI_CHECK_WCT(req, 1);
 319                 parms->writeclose.out.nwritten = SVAL(req->in.vwv, VWV(0));
 320                 break;
 321         case RAW_WRITE_WRITEX:
 322                 SMBCLI_CHECK_WCT(req, 6);
 323                 parms->writex.out.nwritten  = SVAL(req->in.vwv, VWV(2));
 324                 parms->writex.out.nwritten += (CVAL(req->in.vwv, VWV(4)) << 16);
 325                 parms->writex.out.remaining = SVAL(req->in.vwv, VWV(3));
 326                 break;
 327         case RAW_WRITE_SPLWRITE:
 328                 break;
 329         case RAW_WRITE_SMB2:
 330                 req->status = NT_STATUS_INTERNAL_ERROR;
 331                 break;
 332         }
 333
 334 failed:
 335         return smbcli_request_destroy(req);
 336 }
 337
 338 /****************************************************************************
 339  raw write interface (sync interface)
 340 ****************************************************************************/
 341 NTSTATUS smb_raw_write(struct smbcli_tree *tree, union smb_write *parms)
 342 {
 343         struct smbcli_request *req = smb_raw_write_send(tree, parms);
 344         return smb_raw_write_recv(req, parms);
 345 }