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   Read size bytes at offset offset using SMBreadX.
  54 ****************************************************************************/
  55
  56 ssize_t cli_read(struct cli_state *cli, int fnum, char *buf, off_t offset, size_t size)
  57 {
  58         uint32 ecode;
  59         uint8 eclass;
  60         char *p;
  61         int size2;
  62         int readsize;
  63         ssize_t total = 0;
  64
  65         if (size == 0)
  66                 return 0;
  67
  68         /*
  69          * Set readsize to the maximum size we can handle in one readX,
  70          * rounded down to a multiple of 1024.
  71          */
  72
  73         readsize = (cli->max_xmit - (smb_size+32)) & ~1023;
  74
  75         while (total < size) {
  76                 readsize = MIN(readsize, size-total);
  77
  78                 /* Issue a read and receive a reply */
  79
  80                 if (!cli_issue_read(cli, fnum, offset, readsize, 0))
  81                         return -1;
  82
  83                 if (!cli_receive_smb(cli))
  84                         return -1;
  85
  86                 /*
  87                  * Check for error.  Because the client library doesn't support
  88                  * STATUS32, we need to check for and ignore the more data error
  89                  * for pipe support.
  90                  */
  91
  92                 if (cli_error(cli, &eclass, &ecode, NULL) &&
  93                         (eclass != ERRDOS && ecode != ERRmoredata)) {
  94                         return -1;
  95                 }
  96
  97                 size2 = SVAL(cli->inbuf, smb_vwv5);
  98
  99                 if (size2 > readsize) {
 100                         DEBUG(5,("server returned more than we wanted!\n"));
 101                         return -1;
 102                 } else if (size2 < 0) {
 103                         DEBUG(5,("read return < 0!\n"));
 104                         return -1;
 105                 }
 106
 107                 /* Copy data into buffer */
 108
 109                 p = smb_base(cli->inbuf) + SVAL(cli->inbuf,smb_vwv6);
 110                 memcpy(buf + total, p, size2);
 111
 112                 total += size2;
 113                 offset += size2;
 114
 115                 /*
 116                  * If the server returned less than we asked for we're at EOF.
 117                  */
 118
 119                 if (size2 < readsize)
 120                         break;
 121         }
 122
 123         return total;
 124 }
 125
 126 /****************************************************************************
 127 issue a single SMBwrite and don't wait for a reply
 128 ****************************************************************************/
 129
 130 static BOOL cli_issue_write(struct cli_state *cli, int fnum, off_t offset, uint16 mode, char *buf,
 131                             size_t size, int i)
 132 {
 133         char *p;
 134
 135         memset(cli->outbuf,'\0',smb_size);
 136         memset(cli->inbuf,'\0',smb_size);
 137
 138         if (size > 0xFFFF)
 139                 set_message(cli->outbuf,14,0,True);
 140         else
 141                 set_message(cli->outbuf,12,0,True);
 142
 143         CVAL(cli->outbuf,smb_com) = SMBwriteX;
 144         SSVAL(cli->outbuf,smb_tid,cli->cnum);
 145         cli_setup_packet(cli);
 146
 147         CVAL(cli->outbuf,smb_vwv0) = 0xFF;
 148         SSVAL(cli->outbuf,smb_vwv2,fnum);
 149
 150         SIVAL(cli->outbuf,smb_vwv3,offset);
 151         SIVAL(cli->outbuf,smb_vwv5,(mode & 0x0008) ? 0xFFFFFFFF : 0);
 152         SSVAL(cli->outbuf,smb_vwv7,mode);
 153
 154         SSVAL(cli->outbuf,smb_vwv8,(mode & 0x0008) ? size : 0);
 155         SSVAL(cli->outbuf,smb_vwv9,((size>>16)&1));
 156         SSVAL(cli->outbuf,smb_vwv10,size);
 157         SSVAL(cli->outbuf,smb_vwv11,
 158               smb_buf(cli->outbuf) - smb_base(cli->outbuf));
 159
 160         p = smb_base(cli->outbuf) + SVAL(cli->outbuf,smb_vwv11);
 161         memcpy(p, buf, size);
 162         cli_setup_bcc(cli, p+size);
 163
 164         SSVAL(cli->outbuf,smb_mid,cli->mid + i);
 165
 166         show_msg(cli->outbuf);
 167         return cli_send_smb(cli);
 168 }
 169
 170 /****************************************************************************
 171   write to a file
 172   write_mode: 0x0001 disallow write cacheing
 173               0x0002 return bytes remaining
 174               0x0004 use raw named pipe protocol
 175               0x0008 start of message mode named pipe protocol
 176 ****************************************************************************/
 177
 178 ssize_t cli_write(struct cli_state *cli,
 179                   int fnum, uint16 write_mode,
 180                   char *buf, off_t offset, size_t size)
 181 {
 182         int bwritten = 0;
 183         int issued = 0;
 184         int received = 0;
 185         int mpx = MAX(cli->max_mux-1, 1);
 186         int block = (cli->max_xmit - (smb_size+32)) & ~1023;
 187         int blocks = (size + (block-1)) / block;
 188
 189         while (received < blocks) {
 190
 191                 while ((issued - received < mpx) && (issued < blocks)) {
 192                         int bsent = issued * block;
 193                         int size1 = MIN(block, size - bsent);
 194
 195                         if (!cli_issue_write(cli, fnum, offset + bsent,
 196                                         write_mode,
 197                                         buf + bsent,
 198                                         size1, issued))
 199                                 return -1;
 200                         issued++;
 201                 }
 202
 203                 if (!cli_receive_smb(cli))
 204                         return bwritten;
 205
 206                 received++;
 207
 208                 if (CVAL(cli->inbuf,smb_rcls) != 0)
 209                         break;
 210
 211                 bwritten += SVAL(cli->inbuf, smb_vwv2);
 212         }
 213
 214         while (received < issued && cli_receive_smb(cli))
 215                 received++;
 216
 217         return bwritten;
 218 }
 219
 220 /****************************************************************************
 221   write to a file using a SMBwrite and not bypassing 0 byte writes
 222 ****************************************************************************/
 223
 224 ssize_t cli_smbwrite(struct cli_state *cli,
 225                      int fnum, char *buf, off_t offset, size_t size1)
 226 {
 227         char *p;
 228         ssize_t total = 0;
 229
 230         do {
 231                 size_t size = MIN(size1, cli->max_xmit - 48);
 232
 233                 memset(cli->outbuf,'\0',smb_size);
 234                 memset(cli->inbuf,'\0',smb_size);
 235
 236                 set_message(cli->outbuf,5, 0,True);
 237
 238                 CVAL(cli->outbuf,smb_com) = SMBwrite;
 239                 SSVAL(cli->outbuf,smb_tid,cli->cnum);
 240                 cli_setup_packet(cli);
 241
 242                 SSVAL(cli->outbuf,smb_vwv0,fnum);
 243                 SSVAL(cli->outbuf,smb_vwv1,size);
 244                 SIVAL(cli->outbuf,smb_vwv2,offset);
 245                 SSVAL(cli->outbuf,smb_vwv4,0);
 246
 247                 p = smb_buf(cli->outbuf);
 248                 *p++ = 1;
 249                 SSVAL(p, 0, size); p += 2;
 250                 memcpy(p, buf, size); p += size;
 251
 252                 cli_setup_bcc(cli, p);
 253
 254                 if (!cli_send_smb(cli))
 255                         return -1;
 256
 257                 if (!cli_receive_smb(cli))
 258                         return -1;
 259
 260                 if (CVAL(cli->inbuf,smb_rcls) != 0)
 261                         return -1;
 262
 263                 size = SVAL(cli->inbuf,smb_vwv0);
 264                 if (size == 0)
 265                         break;
 266
 267                 size1 -= size;
 268                 total += size;
 269         } while (size1);
 270
 271         return total;
 272 }