summaryrefslogtreecommitdiff
path: root/source4/libcli/smb_composite/loadfile.c
blob: db074bfd2b526fdff0a4356d2c15ec7ce983a901 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
/* 
   Unix SMB/CIFS implementation.

   Copyright (C) Andrew Tridgell 2005
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
  a composite API for loading a whole file into memory
*/

#include "includes.h"
#include "libcli/raw/libcliraw.h"
#include "libcli/composite/composite.h"
#include "libcli/smb_composite/smb_composite.h"

/* the stages of this call */
enum loadfile_stage {LOADFILE_OPEN, LOADFILE_READ, LOADFILE_CLOSE};


static void loadfile_handler(struct smbcli_request *req);

struct loadfile_state {
	enum loadfile_stage stage;
	struct smb_composite_loadfile *io;
	struct smbcli_request *req;
	union smb_open *io_open;
	union smb_read *io_read;
};

/*
  setup for the close
*/
static NTSTATUS setup_close(struct composite_context *c, 
			    struct smbcli_tree *tree, uint16_t fnum)
{
	struct loadfile_state *state = talloc_get_type(c->private_data, struct loadfile_state);
	union smb_close *io_close;

	/* nothing to read, setup the close */
	io_close = talloc(c, union smb_close);
	NT_STATUS_HAVE_NO_MEMORY(io_close);
	
	io_close->close.level = RAW_CLOSE_CLOSE;
	io_close->close.file.fnum = fnum;
	io_close->close.in.write_time = 0;

	state->req = smb_raw_close_send(tree, io_close);
	NT_STATUS_HAVE_NO_MEMORY(state->req);

	/* call the handler again when the close is done */
	state->req->async.fn = loadfile_handler;
	state->req->async.private = c;
	state->stage = LOADFILE_CLOSE;

	return NT_STATUS_OK;
}

/*
  called when the open is done - pull the results and setup for the
  first readx, or close if the file is zero size
*/
static NTSTATUS loadfile_open(struct composite_context *c, 
			      struct smb_composite_loadfile *io)
{
	struct loadfile_state *state = talloc_get_type(c->private_data, struct loadfile_state);
	struct smbcli_tree *tree = state->req->tree;
	NTSTATUS status;

	status = smb_raw_open_recv(state->req, c, state->io_open);
	NT_STATUS_NOT_OK_RETURN(status);
	
	/* don't allow stupidly large loads */
	if (state->io_open->ntcreatex.out.size > 100*1000*1000) {
		return NT_STATUS_INSUFFICIENT_RESOURCES;
	}

	/* allocate space for the file data */
	io->out.size = state->io_open->ntcreatex.out.size;
	io->out.data = talloc_array(c, uint8_t, io->out.size);
	NT_STATUS_HAVE_NO_MEMORY(io->out.data);

	if (io->out.size == 0) {
		return setup_close(c, tree, state->io_open->ntcreatex.file.fnum);
	}

	/* setup for the read */
	state->io_read = talloc(c, union smb_read);
	NT_STATUS_HAVE_NO_MEMORY(state->io_read);
	
	state->io_read->readx.level        = RAW_READ_READX;
	state->io_read->readx.file.fnum    = state->io_open->ntcreatex.file.fnum;
	state->io_read->readx.in.offset    = 0;
	state->io_read->readx.in.mincnt    = MIN(32768, io->out.size);
	state->io_read->readx.in.maxcnt    = state->io_read->readx.in.mincnt;
	state->io_read->readx.in.remaining = 0;
	state->io_read->readx.in.read_for_execute = False;
	state->io_read->readx.out.data     = io->out.data;

	state->req = smb_raw_read_send(tree, state->io_read);
	NT_STATUS_HAVE_NO_MEMORY(state->req);

	/* call the handler again when the first read is done */
	state->req->async.fn = loadfile_handler;
	state->req->async.private = c;
	state->stage = LOADFILE_READ;

	talloc_free(state->io_open);

	return NT_STATUS_OK;
}


/*
  called when a read is done - pull the results and setup for the
  next read, or close if the file is all done
*/
static NTSTATUS loadfile_read(struct composite_context *c, 
			      struct smb_composite_loadfile *io)
{
	struct loadfile_state *state = talloc_get_type(c->private_data, struct loadfile_state);
	struct smbcli_tree *tree = state->req->tree;
	NTSTATUS status;

	status = smb_raw_read_recv(state->req, state->io_read);
	NT_STATUS_NOT_OK_RETURN(status);
	
	/* we might be done */
	if (state->io_read->readx.in.offset +
	    state->io_read->readx.out.nread == io->out.size) {
		return setup_close(c, tree, state->io_read->readx.file.fnum);
	}

	/* setup for the next read */
	state->io_read->readx.in.offset += state->io_read->readx.out.nread;
	state->io_read->readx.in.mincnt = MIN(32768, io->out.size - state->io_read->readx.in.offset);
	state->io_read->readx.out.data = io->out.data + state->io_read->readx.in.offset;

	state->req = smb_raw_read_send(tree, state->io_read);
	NT_STATUS_HAVE_NO_MEMORY(state->req);

	/* call the handler again when the read is done */
	state->req->async.fn = loadfile_handler;
	state->req->async.private = c;

	return NT_STATUS_OK;
}

/*
  called when the close is done, check the status and cleanup
*/
static NTSTATUS loadfile_close(struct composite_context *c, 
			       struct smb_composite_loadfile *io)
{
	struct loadfile_state *state = talloc_get_type(c->private_data, struct loadfile_state);
	NTSTATUS status;

	status = smbcli_request_simple_recv(state->req);
	NT_STATUS_NOT_OK_RETURN(status);
	
	c->state = COMPOSITE_STATE_DONE;

	return NT_STATUS_OK;
}
						     

/*
  handler for completion of a sub-request in loadfile
*/
static void loadfile_handler(struct smbcli_request *req)
{
	struct composite_context *c = req->async.private;
	struct loadfile_state *state = talloc_get_type(c->private_data, struct loadfile_state);

	/* when this handler is called, the stage indicates what
	   call has just finished */
	switch (state->stage) {
	case LOADFILE_OPEN:
		c->status = loadfile_open(c, state->io);
		break;

	case LOADFILE_READ:
		c->status = loadfile_read(c, state->io);
		break;

	case LOADFILE_CLOSE:
		c->status = loadfile_close(c, state->io);
		break;
	}

	if (!NT_STATUS_IS_OK(c->status)) {
		c->state = COMPOSITE_STATE_ERROR;
	}

	if (c->state >= COMPOSITE_STATE_DONE &&
	    c->async.fn) {
		c->async.fn(c);
	}
}

/*
  composite loadfile call - does an openx followed by a number of readx calls,
  followed by a close
*/
struct composite_context *smb_composite_loadfile_send(struct smbcli_tree *tree, 
						     struct smb_composite_loadfile *io)
{
	struct composite_context *c;
	struct loadfile_state *state;

	c = talloc_zero(tree, struct composite_context);
	if (c == NULL) goto failed;

	state = talloc(c, struct loadfile_state);
	if (state == NULL) goto failed;

	state->io = io;

	c->private_data = state;
	c->state = COMPOSITE_STATE_IN_PROGRESS;
	c->event_ctx = tree->session->transport->socket->event.ctx;

	/* setup for the open */
	state->io_open = talloc_zero(c, union smb_open);
	if (state->io_open == NULL) goto failed;
	
	state->io_open->ntcreatex.level               = RAW_OPEN_NTCREATEX;
	state->io_open->ntcreatex.in.flags            = NTCREATEX_FLAGS_EXTENDED;
	state->io_open->ntcreatex.in.access_mask      = SEC_FILE_READ_DATA;
	state->io_open->ntcreatex.in.file_attr        = FILE_ATTRIBUTE_NORMAL;
	state->io_open->ntcreatex.in.share_access     = NTCREATEX_SHARE_ACCESS_READ | NTCREATEX_SHARE_ACCESS_WRITE;
	state->io_open->ntcreatex.in.open_disposition = NTCREATEX_DISP_OPEN;
	state->io_open->ntcreatex.in.impersonation    = NTCREATEX_IMPERSONATION_ANONYMOUS;
	state->io_open->ntcreatex.in.fname            = io->in.fname;

	/* send the open on its way */
	state->req = smb_raw_open_send(tree, state->io_open);
	if (state->req == NULL) goto failed;

	/* setup the callback handler */
	state->req->async.fn = loadfile_handler;
	state->req->async.private = c;
	state->stage = LOADFILE_OPEN;

	return c;

failed:
	talloc_free(c);
	return NULL;
}


/*
  composite loadfile call - recv side
*/
NTSTATUS smb_composite_loadfile_recv(struct composite_context *c, TALLOC_CTX *mem_ctx)
{
	NTSTATUS status;

	status = composite_wait(c);

	if (NT_STATUS_IS_OK(status)) {
		struct loadfile_state *state = talloc_get_type(c->private_data, struct loadfile_state);
		talloc_steal(mem_ctx, state->io->out.data);
	}

	talloc_free(c);
	return status;
}


/*
  composite loadfile call - sync interface
*/
NTSTATUS smb_composite_loadfile(struct smbcli_tree *tree, 
				TALLOC_CTX *mem_ctx,
				struct smb_composite_loadfile *io)
{
	struct composite_context *c = smb_composite_loadfile_send(tree, io);
	return smb_composite_loadfile_recv(c, mem_ctx);
}