source4/smb_server/nttrans.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    NT transaction handling
   4    Copyright (C) Andrew Tridgell 2003
   5    Copyright (C) James J Myers 2003 <myersjj@samba.org>
   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    This file handles the parsing of transact2 requests
  23 */
  24
  25 #include "includes.h"
  26
  27
  28 #define CHECK_MIN_BLOB_SIZE(blob, size) do { \
  29         if ((blob)->length < (size)) { \
  30                 return NT_STATUS_INFO_LENGTH_MISMATCH; \
  31         }} while (0)
  32
  33
  34 /* setup a nttrans reply, given the data and params sizes */
  35 static void nttrans_setup_reply(struct request_context *req,
  36                                struct smb_nttrans *trans,
  37                                uint16 param_size, uint16 data_size,
  38                                uint16 setup_count)
  39 {
  40         trans->out.setup_count = setup_count;
  41         if (setup_count != 0) {
  42                 trans->out.setup = talloc_zero(req->mem_ctx, sizeof(uint16) * setup_count);
  43         }
  44         trans->out.params = data_blob_talloc(req->mem_ctx, NULL, param_size);
  45         trans->out.data = data_blob_talloc(req->mem_ctx, NULL, data_size);
  46 }
  47
  48
  49 /* parse NTTRANS_CREATE request
  50  */
  51 static NTSTATUS nttrans_create(struct request_context *req,
  52                 struct smb_nttrans *trans)
  53 {
  54         return NT_STATUS_FOOBAR;
  55 }
  56
  57 /* parse NTTRANS_RENAME request
  58  */
  59 static NTSTATUS nttrans_rename(struct request_context *req,
  60                 struct smb_nttrans *trans)
  61 {
  62         return NT_STATUS_FOOBAR;
  63 }
  64 /* parse NTTRANS_IOCTL request
  65  */
  66 static NTSTATUS nttrans_ioctl(struct request_context *req,
  67                 struct smb_nttrans *trans)
  68 {
  69         union smb_ioctl nt;
  70         uint32_t function;
  71         uint16 fnum;
  72         uint8 filter;
  73         BOOL fsctl;
  74         DATA_BLOB *blob;
  75
  76         /* should have at least 4 setup words */
  77         if (trans->in.setup_count != 4) {
  78                 return NT_STATUS_INVALID_PARAMETER;
  79         }
  80
  81         function  = IVAL(trans->in.setup, 0);
  82         fnum  = SVAL(trans->in.setup, 4);
  83         fsctl = CVAL(trans->in.setup, 6);
  84         filter = CVAL(trans->in.setup, 7);
  85
  86         blob = &trans->in.data;
  87
  88         nt.ntioctl.level = RAW_IOCTL_NTIOCTL;
  89         nt.ntioctl.in.fnum = fnum;
  90         nt.ntioctl.in.function = function;
  91         nt.ntioctl.in.fsctl = fsctl;
  92         nt.ntioctl.in.filter = filter;
  93
  94         nttrans_setup_reply(req, trans, 0, 0, 1);
  95         trans->out.setup[0] = 0;
  96
  97         return req->conn->ntvfs_ops->ioctl(req, &nt);
  98 }
  99
 100 /*
 101   backend for nttrans requests
 102 */
 103 static NTSTATUS nttrans_backend(struct request_context *req,
 104                 struct smb_nttrans *trans)
 105 {
 106         DEBUG(9,("nttrans_backend: setup_count=%d function=%d\n",
 107                 trans->in.setup_count, trans->in.function));
 108         /* must have at least one setup word */
 109         if (trans->in.setup_count < 1) {
 110                 return NT_STATUS_FOOBAR;
 111         }
 112
 113         /* the nttrans command is in function */
 114         switch (trans->in.function) {
 115         case NT_TRANSACT_CREATE:
 116                 return nttrans_create(req, trans);
 117         case NT_TRANSACT_IOCTL:
 118                 return nttrans_ioctl(req, trans);
 119         case NT_TRANSACT_RENAME:
 120                 return nttrans_rename(req, trans);
 121         }
 122
 123         /* an unknown nttrans command */
 124         return NT_STATUS_FOOBAR;
 125 }
 126
 127
 128 /****************************************************************************
 129  Reply to an SMBnttrans request
 130 ****************************************************************************/
 131 void reply_nttrans(struct request_context *req)
 132 {
 133         struct smb_nttrans trans;
 134         int i;
 135         uint16 param_ofs, data_ofs;
 136         uint16 param_count, data_count;
 137         uint16 params_left, data_left;
 138         uint16 param_total, data_total;
 139         char *params, *data;
 140         NTSTATUS status;
 141
 142         /* parse request */
 143         if (req->in.wct < 19) {
 144                 req_reply_error(req, NT_STATUS_FOOBAR);
 145                 return;
 146         }
 147
 148         trans.in.max_setup   = CVAL(req->in.vwv, 0);
 149         param_total          = IVAL(req->in.vwv, 3);
 150         data_total           = IVAL(req->in.vwv, 7);
 151         trans.in.max_param   = IVAL(req->in.vwv, 11);
 152         trans.in.max_data    = IVAL(req->in.vwv, 15);
 153         param_count          = IVAL(req->in.vwv, 19);
 154         param_ofs            = IVAL(req->in.vwv, 23);
 155         data_count           = IVAL(req->in.vwv, 27);
 156         data_ofs             = IVAL(req->in.vwv, 31);
 157         trans.in.setup_count = CVAL(req->in.vwv, 35);
 158         trans.in.function        = SVAL(req->in.vwv, 36);
 159
 160         if (req->in.wct != 19 + trans.in.setup_count) {
 161                 req_reply_dos_error(req, ERRSRV, ERRerror);
 162                 return;
 163         }
 164
 165         /* parse out the setup words */
 166         trans.in.setup = talloc(req->mem_ctx, trans.in.setup_count * sizeof(uint16));
 167         if (!trans.in.setup) {
 168                 req_reply_error(req, NT_STATUS_NO_MEMORY);
 169                 return;
 170         }
 171         for (i=0;i<trans.in.setup_count;i++) {
 172                 trans.in.setup[i] = SVAL(req->in.vwv, VWV(19+i));
 173         }
 174
 175         if (!req_pull_blob(req, req->in.hdr + param_ofs, param_count, &trans.in.params) ||
 176             !req_pull_blob(req, req->in.hdr + data_ofs, data_count, &trans.in.data)) {
 177                 req_reply_error(req, NT_STATUS_FOOBAR);
 178                 return;
 179         }
 180
 181         /* is it a partial request? if so, then send a 'send more' message */
 182         if (param_total > param_count ||
 183             data_total > data_count) {
 184                 DEBUG(0,("REWRITE: not handling partial nttrans requests!\n"));
 185                 return;
 186         }
 187
 188         /* its a full request, give it to the backend */
 189         status = nttrans_backend(req, &trans);
 190
 191         if (!NT_STATUS_IS_OK(status)) {
 192                 req_reply_error(req, status);
 193                 return;
 194         }
 195
 196         params_left = trans.out.params.length;
 197         data_left   = trans.out.data.length;
 198         params      = trans.out.params.data;
 199         data        = trans.out.data.data;
 200
 201         req->control_flags |= REQ_CONTROL_PROTECTED;
 202
 203         /* we need to divide up the reply into chunks that fit into
 204            the negotiated buffer size */
 205         do {
 206                 uint16 this_data, this_param, max_bytes;
 207                 uint_t align1 = 1, align2 = (params_left ? 2 : 0);
 208
 209                 req_setup_reply(req, 18 + trans.out.setup_count, 0);
 210
 211                 max_bytes = req_max_data(req) - (align1 + align2);
 212
 213                 this_param = params_left;
 214                 if (this_param > max_bytes) {
 215                         this_param = max_bytes;
 216                 }
 217                 max_bytes -= this_param;
 218
 219                 this_data = data_left;
 220                 if (this_data > max_bytes) {
 221                         this_data = max_bytes;
 222                 }
 223
 224                 req_grow_data(req, this_param + this_data + (align1 + align2));
 225
 226                 SIVAL(req->out.vwv, 3, trans.out.params.length);
 227                 SIVAL(req->out.vwv, 7, trans.out.data.length);
 228
 229                 SIVAL(req->out.vwv, 11, this_param);
 230                 SIVAL(req->out.vwv, 15, align1 + PTR_DIFF(req->out.data, req->out.hdr));
 231                 SIVAL(req->out.vwv, 19, PTR_DIFF(params, trans.out.params.data));
 232
 233                 SIVAL(req->out.vwv, 23, this_data);
 234                 SIVAL(req->out.vwv, 27, align1 + align2 +
 235                       PTR_DIFF(req->out.data + this_param, req->out.hdr));
 236                 SIVAL(req->out.vwv, 31, PTR_DIFF(data, trans.out.data.data));
 237
 238                 SCVAL(req->out.vwv, 35, trans.out.setup_count);
 239                 for (i=0;i<trans.out.setup_count;i++) {
 240                         SSVAL(req->out.vwv, VWV(18+i)+1, trans.out.setup[i]);
 241                 }
 242
 243                 memset(req->out.data, 0, align1);
 244                 if (this_param != 0) {
 245                         memcpy(req->out.data + align1, params, this_param);
 246                 }
 247                 memset(req->out.data+this_param+align1, 0, align2);
 248                 if (this_data != 0) {
 249                         memcpy(req->out.data+this_param+align1+align2, data, this_data);
 250                 }
 251
 252                 params_left -= this_param;
 253                 data_left -= this_data;
 254                 params += this_param;
 255                 data += this_data;
 256
 257                 /* if this is the last chunk then the request can be destroyed */
 258                 if (params_left == 0 && data_left == 0) {
 259                         req->control_flags &= ~REQ_CONTROL_PROTECTED;
 260                 }
 261
 262                 req_send_reply(req);
 263         } while (params_left != 0 || data_left != 0);
 264 }
 265
 266
 267 /****************************************************************************
 268  Reply to an SMBnttranss request
 269 ****************************************************************************/
 270 void reply_nttranss(struct request_context *req)
 271 {
 272         req_reply_error(req, NT_STATUS_FOOBAR);
 273 }