source4/libcli/smb_composite/savefile.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Copyright (C) Andrew Tridgell 2005
   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 3 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, see <http://www.gnu.org/licenses/>.
  18 */
  19 /*
  20   a composite API for saving a whole file from memory
  21 */
  22
  23 #include "includes.h"
  24 #include "libcli/raw/libcliraw.h"
  25 #include "libcli/raw/raw_proto.h"
  26 #include "libcli/composite/composite.h"
  27 #include "libcli/smb_composite/smb_composite.h"
  28
  29 /* the stages of this call */
  30 enum savefile_stage {SAVEFILE_OPEN, SAVEFILE_WRITE, SAVEFILE_CLOSE};
  31
  32 static void savefile_handler(struct smbcli_request *req);
  33
  34 struct savefile_state {
  35         enum savefile_stage stage;
  36         off_t total_written;
  37         struct smb_composite_savefile *io;
  38         union smb_open *io_open;
  39         union smb_write *io_write;
  40         struct smbcli_request *req;
  41 };
  42
  43
  44 /*
  45   setup for the close
  46 */
  47 static NTSTATUS setup_close(struct composite_context *c,
  48                             struct smbcli_tree *tree, uint16_t fnum)
  49 {
  50         struct savefile_state *state = talloc_get_type(c->private_data, struct savefile_state);
  51         union smb_close *io_close;
  52
  53         /* nothing to write, setup the close */
  54         io_close = talloc(c, union smb_close);
  55         NT_STATUS_HAVE_NO_MEMORY(io_close);
  56
  57         io_close->close.level = RAW_CLOSE_CLOSE;
  58         io_close->close.in.file.fnum = fnum;
  59         io_close->close.in.write_time = 0;
  60
  61         state->req = smb_raw_close_send(tree, io_close);
  62         NT_STATUS_HAVE_NO_MEMORY(state->req);
  63
  64         /* call the handler again when the close is done */
  65         state->stage = SAVEFILE_CLOSE;
  66         state->req->async.fn = savefile_handler;
  67         state->req->async.private_data = c;
  68
  69         return NT_STATUS_OK;
  70 }
  71
  72 /*
  73   called when the open is done - pull the results and setup for the
  74   first writex, or close if the file is zero size
  75 */
  76 static NTSTATUS savefile_open(struct composite_context *c,
  77                               struct smb_composite_savefile *io)
  78 {
  79         struct savefile_state *state = talloc_get_type(c->private_data, struct savefile_state);
  80         union smb_write *io_write;
  81         struct smbcli_tree *tree = state->req->tree;
  82         NTSTATUS status;
  83         uint32_t max_xmit = tree->session->transport->negotiate.max_xmit;
  84
  85         status = smb_raw_open_recv(state->req, c, state->io_open);
  86         NT_STATUS_NOT_OK_RETURN(status);
  87
  88         if (io->in.size == 0) {
  89                 return setup_close(c, tree, state->io_open->ntcreatex.out.file.fnum);
  90         }
  91
  92         /* setup for the first write */
  93         io_write = talloc(c, union smb_write);
  94         NT_STATUS_HAVE_NO_MEMORY(io_write);
  95
  96         io_write->writex.level        = RAW_WRITE_WRITEX;
  97         io_write->writex.in.file.fnum = state->io_open->ntcreatex.out.file.fnum;
  98         io_write->writex.in.offset    = 0;
  99         io_write->writex.in.wmode     = 0;
 100         io_write->writex.in.remaining = 0;
 101         io_write->writex.in.count     = MIN(max_xmit - 100, io->in.size);
 102         io_write->writex.in.data      = io->in.data;
 103         state->io_write = io_write;
 104
 105         state->req = smb_raw_write_send(tree, io_write);
 106         NT_STATUS_HAVE_NO_MEMORY(state->req);
 107
 108         /* call the handler again when the first write is done */
 109         state->stage = SAVEFILE_WRITE;
 110         state->req->async.fn = savefile_handler;
 111         state->req->async.private_data = c;
 112         talloc_free(state->io_open);
 113
 114         return NT_STATUS_OK;
 115 }
 116
 117
 118 /*
 119   called when a write is done - pull the results and setup for the
 120   next write, or close if the file is all done
 121 */
 122 static NTSTATUS savefile_write(struct composite_context *c,
 123                               struct smb_composite_savefile *io)
 124 {
 125         struct savefile_state *state = talloc_get_type(c->private_data, struct savefile_state);
 126         struct smbcli_tree *tree = state->req->tree;
 127         NTSTATUS status;
 128         uint32_t max_xmit = tree->session->transport->negotiate.max_xmit;
 129
 130         status = smb_raw_write_recv(state->req, state->io_write);
 131         NT_STATUS_NOT_OK_RETURN(status);
 132
 133         state->total_written += state->io_write->writex.out.nwritten;
 134
 135         /* we might be done */
 136         if (state->io_write->writex.out.nwritten != state->io_write->writex.in.count ||
 137             state->total_written == io->in.size) {
 138                 return setup_close(c, tree, state->io_write->writex.in.file.fnum);
 139         }
 140
 141         /* setup for the next write */
 142         state->io_write->writex.in.offset = state->total_written;
 143         state->io_write->writex.in.count = MIN(max_xmit - 100,
 144                                                io->in.size - state->total_written);
 145         state->io_write->writex.in.data = io->in.data + state->total_written;
 146
 147         state->req = smb_raw_write_send(tree, state->io_write);
 148         NT_STATUS_HAVE_NO_MEMORY(state->req);
 149
 150         /* call the handler again when the write is done */
 151         state->req->async.fn = savefile_handler;
 152         state->req->async.private_data = c;
 153
 154         return NT_STATUS_OK;
 155 }
 156
 157 /*
 158   called when the close is done, check the status and cleanup
 159 */
 160 static NTSTATUS savefile_close(struct composite_context *c,
 161                                struct smb_composite_savefile *io)
 162 {
 163         struct savefile_state *state = talloc_get_type(c->private_data, struct savefile_state);
 164         NTSTATUS status;
 165
 166         status = smbcli_request_simple_recv(state->req);
 167         NT_STATUS_NOT_OK_RETURN(status);
 168
 169         if (state->total_written != io->in.size) {
 170                 return NT_STATUS_DISK_FULL;
 171         }
 172
 173         c->state = COMPOSITE_STATE_DONE;
 174
 175         return NT_STATUS_OK;
 176 }
 177
 178
 179 /*
 180   handler for completion of a sub-request in savefile
 181 */
 182 static void savefile_handler(struct smbcli_request *req)
 183 {
 184         struct composite_context *c = (struct composite_context *)req->async.private_data;
 185         struct savefile_state *state = talloc_get_type(c->private_data, struct savefile_state);
 186
 187         /* when this handler is called, the stage indicates what
 188            call has just finished */
 189         switch (state->stage) {
 190         case SAVEFILE_OPEN:
 191                 c->status = savefile_open(c, state->io);
 192                 break;
 193
 194         case SAVEFILE_WRITE:
 195                 c->status = savefile_write(c, state->io);
 196                 break;
 197
 198         case SAVEFILE_CLOSE:
 199                 c->status = savefile_close(c, state->io);
 200                 break;
 201         }
 202
 203         if (!NT_STATUS_IS_OK(c->status)) {
 204                 c->state = COMPOSITE_STATE_ERROR;
 205         }
 206
 207         if (c->state >= COMPOSITE_STATE_DONE &&
 208             c->async.fn) {
 209                 c->async.fn(c);
 210         }
 211 }
 212
 213 /*
 214   composite savefile call - does an openx followed by a number of writex calls,
 215   followed by a close
 216 */
 217 struct composite_context *smb_composite_savefile_send(struct smbcli_tree *tree,
 218                                                       struct smb_composite_savefile *io)
 219 {
 220         struct composite_context *c;
 221         struct savefile_state *state;
 222         union smb_open *io_open;
 223
 224         c = talloc_zero(tree, struct composite_context);
 225         if (c == NULL) goto failed;
 226
 227         c->state = COMPOSITE_STATE_IN_PROGRESS;
 228         c->event_ctx = tree->session->transport->ev;
 229
 230         state = talloc(c, struct savefile_state);
 231         if (state == NULL) goto failed;
 232
 233         state->stage = SAVEFILE_OPEN;
 234         state->total_written = 0;
 235         state->io = io;
 236
 237         /* setup for the open */
 238         io_open = talloc_zero(c, union smb_open);
 239         if (io_open == NULL) goto failed;
 240
 241         io_open->ntcreatex.level               = RAW_OPEN_NTCREATEX;
 242         io_open->ntcreatex.in.flags            = NTCREATEX_FLAGS_EXTENDED;
 243         io_open->ntcreatex.in.access_mask      = SEC_FILE_WRITE_DATA;
 244         io_open->ntcreatex.in.file_attr        = FILE_ATTRIBUTE_NORMAL;
 245         io_open->ntcreatex.in.share_access     = NTCREATEX_SHARE_ACCESS_READ | NTCREATEX_SHARE_ACCESS_WRITE;
 246         io_open->ntcreatex.in.open_disposition = NTCREATEX_DISP_OPEN_IF;
 247         io_open->ntcreatex.in.impersonation    = NTCREATEX_IMPERSONATION_ANONYMOUS;
 248         io_open->ntcreatex.in.fname            = io->in.fname;
 249         state->io_open = io_open;
 250
 251         /* send the open on its way */
 252         state->req = smb_raw_open_send(tree, io_open);
 253         if (state->req == NULL) goto failed;
 254
 255         /* setup the callback handler */
 256         state->req->async.fn = savefile_handler;
 257         state->req->async.private_data = c;
 258         c->private_data = state;
 259
 260         return c;
 261
 262 failed:
 263         talloc_free(c);
 264         return NULL;
 265 }
 266
 267
 268 /*
 269   composite savefile call - recv side
 270 */
 271 NTSTATUS smb_composite_savefile_recv(struct composite_context *c)
 272 {
 273         NTSTATUS status;
 274         status = composite_wait(c);
 275         talloc_free(c);
 276         return status;
 277 }
 278
 279
 280 /*
 281   composite savefile call - sync interface
 282 */
 283 NTSTATUS smb_composite_savefile(struct smbcli_tree *tree,
 284                                 struct smb_composite_savefile *io)
 285 {
 286         struct composite_context *c = smb_composite_savefile_send(tree, io);
 287         return smb_composite_savefile_recv(c);
 288 }