source4/libcli/smb_composite/loadfile.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 loading a whole file into memory
  21 */
  22
  23 #include "includes.h"
  24 #include "libcli/raw/libcliraw.h"
  25 #include "libcli/composite/composite.h"
  26 #include "libcli/smb_composite/smb_composite.h"
  27
  28 /* the stages of this call */
  29 enum loadfile_stage {LOADFILE_OPEN, LOADFILE_READ, LOADFILE_CLOSE};
  30
  31
  32 static void loadfile_handler(struct smbcli_request *req);
  33
  34 struct loadfile_state {
  35         enum loadfile_stage stage;
  36         struct smb_composite_loadfile *io;
  37         struct smbcli_request *req;
  38         union smb_open *io_open;
  39         union smb_read *io_read;
  40 };
  41
  42 /*
  43   setup for the close
  44 */
  45 static NTSTATUS setup_close(struct composite_context *c,
  46                             struct smbcli_tree *tree, uint16_t fnum)
  47 {
  48         struct loadfile_state *state = talloc_get_type(c->private_data, struct loadfile_state);
  49         union smb_close *io_close;
  50
  51         /* nothing to read, setup the close */
  52         io_close = talloc(c, union smb_close);
  53         NT_STATUS_HAVE_NO_MEMORY(io_close);
  54
  55         io_close->close.level = RAW_CLOSE_CLOSE;
  56         io_close->close.in.file.fnum = fnum;
  57         io_close->close.in.write_time = 0;
  58
  59         state->req = smb_raw_close_send(tree, io_close);
  60         NT_STATUS_HAVE_NO_MEMORY(state->req);
  61
  62         /* call the handler again when the close is done */
  63         state->req->async.fn = loadfile_handler;
  64         state->req->async.private_data = c;
  65         state->stage = LOADFILE_CLOSE;
  66
  67         return NT_STATUS_OK;
  68 }
  69
  70 /*
  71   called when the open is done - pull the results and setup for the
  72   first readx, or close if the file is zero size
  73 */
  74 static NTSTATUS loadfile_open(struct composite_context *c,
  75                               struct smb_composite_loadfile *io)
  76 {
  77         struct loadfile_state *state = talloc_get_type(c->private_data, struct loadfile_state);
  78         struct smbcli_tree *tree = state->req->tree;
  79         NTSTATUS status;
  80
  81         status = smb_raw_open_recv(state->req, c, state->io_open);
  82         NT_STATUS_NOT_OK_RETURN(status);
  83
  84         /* don't allow stupidly large loads */
  85         if (state->io_open->ntcreatex.out.size > 100*1000*1000) {
  86                 return NT_STATUS_INSUFFICIENT_RESOURCES;
  87         }
  88
  89         /* allocate space for the file data */
  90         io->out.size = state->io_open->ntcreatex.out.size;
  91         io->out.data = talloc_array(c, uint8_t, io->out.size);
  92         NT_STATUS_HAVE_NO_MEMORY(io->out.data);
  93
  94         if (io->out.size == 0) {
  95                 return setup_close(c, tree, state->io_open->ntcreatex.out.file.fnum);
  96         }
  97
  98         /* setup for the read */
  99         state->io_read = talloc(c, union smb_read);
 100         NT_STATUS_HAVE_NO_MEMORY(state->io_read);
 101
 102         state->io_read->readx.level        = RAW_READ_READX;
 103         state->io_read->readx.in.file.fnum = state->io_open->ntcreatex.out.file.fnum;
 104         state->io_read->readx.in.offset    = 0;
 105         state->io_read->readx.in.mincnt    = MIN(32768, io->out.size);
 106         state->io_read->readx.in.maxcnt    = state->io_read->readx.in.mincnt;
 107         state->io_read->readx.in.remaining = 0;
 108         state->io_read->readx.in.read_for_execute = false;
 109         state->io_read->readx.out.data     = io->out.data;
 110
 111         state->req = smb_raw_read_send(tree, state->io_read);
 112         NT_STATUS_HAVE_NO_MEMORY(state->req);
 113
 114         /* call the handler again when the first read is done */
 115         state->req->async.fn = loadfile_handler;
 116         state->req->async.private_data = c;
 117         state->stage = LOADFILE_READ;
 118
 119         talloc_free(state->io_open);
 120
 121         return NT_STATUS_OK;
 122 }
 123
 124
 125 /*
 126   called when a read is done - pull the results and setup for the
 127   next read, or close if the file is all done
 128 */
 129 static NTSTATUS loadfile_read(struct composite_context *c,
 130                               struct smb_composite_loadfile *io)
 131 {
 132         struct loadfile_state *state = talloc_get_type(c->private_data, struct loadfile_state);
 133         struct smbcli_tree *tree = state->req->tree;
 134         NTSTATUS status;
 135
 136         status = smb_raw_read_recv(state->req, state->io_read);
 137         NT_STATUS_NOT_OK_RETURN(status);
 138
 139         /* we might be done */
 140         if (state->io_read->readx.in.offset +
 141             state->io_read->readx.out.nread == io->out.size) {
 142                 return setup_close(c, tree, state->io_read->readx.in.file.fnum);
 143         }
 144
 145         /* setup for the next read */
 146         state->io_read->readx.in.offset += state->io_read->readx.out.nread;
 147         state->io_read->readx.in.mincnt = MIN(32768, io->out.size - state->io_read->readx.in.offset);
 148         state->io_read->readx.out.data = io->out.data + state->io_read->readx.in.offset;
 149
 150         state->req = smb_raw_read_send(tree, state->io_read);
 151         NT_STATUS_HAVE_NO_MEMORY(state->req);
 152
 153         /* call the handler again when the read is done */
 154         state->req->async.fn = loadfile_handler;
 155         state->req->async.private_data = c;
 156
 157         return NT_STATUS_OK;
 158 }
 159
 160 /*
 161   called when the close is done, check the status and cleanup
 162 */
 163 static NTSTATUS loadfile_close(struct composite_context *c,
 164                                struct smb_composite_loadfile *io)
 165 {
 166         struct loadfile_state *state = talloc_get_type(c->private_data, struct loadfile_state);
 167         NTSTATUS status;
 168
 169         status = smbcli_request_simple_recv(state->req);
 170         NT_STATUS_NOT_OK_RETURN(status);
 171
 172         c->state = COMPOSITE_STATE_DONE;
 173
 174         return NT_STATUS_OK;
 175 }
 176
 177
 178 /*
 179   handler for completion of a sub-request in loadfile
 180 */
 181 static void loadfile_handler(struct smbcli_request *req)
 182 {
 183         struct composite_context *c = (struct composite_context *)req->async.private_data;
 184         struct loadfile_state *state = talloc_get_type(c->private_data, struct loadfile_state);
 185
 186         /* when this handler is called, the stage indicates what
 187            call has just finished */
 188         switch (state->stage) {
 189         case LOADFILE_OPEN:
 190                 c->status = loadfile_open(c, state->io);
 191                 break;
 192
 193         case LOADFILE_READ:
 194                 c->status = loadfile_read(c, state->io);
 195                 break;
 196
 197         case LOADFILE_CLOSE:
 198                 c->status = loadfile_close(c, state->io);
 199                 break;
 200         }
 201
 202         if (!NT_STATUS_IS_OK(c->status)) {
 203                 c->state = COMPOSITE_STATE_ERROR;
 204         }
 205
 206         if (c->state >= COMPOSITE_STATE_DONE &&
 207             c->async.fn) {
 208                 c->async.fn(c);
 209         }
 210 }
 211
 212 /*
 213   composite loadfile call - does an openx followed by a number of readx calls,
 214   followed by a close
 215 */
 216 struct composite_context *smb_composite_loadfile_send(struct smbcli_tree *tree,
 217                                                      struct smb_composite_loadfile *io)
 218 {
 219         struct composite_context *c;
 220         struct loadfile_state *state;
 221
 222         c = talloc_zero(tree, struct composite_context);
 223         if (c == NULL) goto failed;
 224
 225         state = talloc(c, struct loadfile_state);
 226         if (state == NULL) goto failed;
 227
 228         state->io = io;
 229
 230         c->private_data = state;
 231         c->state = COMPOSITE_STATE_IN_PROGRESS;
 232         c->event_ctx = tree->session->transport->ev;
 233
 234         /* setup for the open */
 235         state->io_open = talloc_zero(c, union smb_open);
 236         if (state->io_open == NULL) goto failed;
 237
 238         state->io_open->ntcreatex.level               = RAW_OPEN_NTCREATEX;
 239         state->io_open->ntcreatex.in.flags            = NTCREATEX_FLAGS_EXTENDED;
 240         state->io_open->ntcreatex.in.access_mask      = SEC_FILE_READ_DATA;
 241         state->io_open->ntcreatex.in.file_attr        = FILE_ATTRIBUTE_NORMAL;
 242         state->io_open->ntcreatex.in.share_access     = NTCREATEX_SHARE_ACCESS_READ | NTCREATEX_SHARE_ACCESS_WRITE;
 243         state->io_open->ntcreatex.in.open_disposition = NTCREATEX_DISP_OPEN;
 244         state->io_open->ntcreatex.in.impersonation    = NTCREATEX_IMPERSONATION_ANONYMOUS;
 245         state->io_open->ntcreatex.in.fname            = io->in.fname;
 246
 247         /* send the open on its way */
 248         state->req = smb_raw_open_send(tree, state->io_open);
 249         if (state->req == NULL) goto failed;
 250
 251         /* setup the callback handler */
 252         state->req->async.fn = loadfile_handler;
 253         state->req->async.private_data = c;
 254         state->stage = LOADFILE_OPEN;
 255
 256         return c;
 257
 258 failed:
 259         talloc_free(c);
 260         return NULL;
 261 }
 262
 263
 264 /*
 265   composite loadfile call - recv side
 266 */
 267 NTSTATUS smb_composite_loadfile_recv(struct composite_context *c, TALLOC_CTX *mem_ctx)
 268 {
 269         NTSTATUS status;
 270
 271         status = composite_wait(c);
 272
 273         if (NT_STATUS_IS_OK(status)) {
 274                 struct loadfile_state *state = talloc_get_type(c->private_data, struct loadfile_state);
 275                 talloc_steal(mem_ctx, state->io->out.data);
 276         }
 277
 278         talloc_free(c);
 279         return status;
 280 }
 281
 282
 283 /*
 284   composite loadfile call - sync interface
 285 */
 286 NTSTATUS smb_composite_loadfile(struct smbcli_tree *tree,
 287                                 TALLOC_CTX *mem_ctx,
 288                                 struct smb_composite_loadfile *io)
 289 {
 290         struct composite_context *c = smb_composite_loadfile_send(tree, io);
 291         return smb_composite_loadfile_recv(c, mem_ctx);
 292 }
 293