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
|
/*
Unix SMB/CIFS implementation.
Copyright (C) Gregor Beck 2013
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "system/network.h"
#include "lib/util/tevent_ntstatus.h"
#include "smb_common.h"
#include "smbXcli_base.h"
struct smb1cli_readx_state {
uint32_t size;
uint16_t vwv[12];
uint32_t received;
uint8_t *buf;
bool out_valid;
};
static void smb1cli_readx_done(struct tevent_req *subreq);
/**
* Send an asynchrounus SMB_COM_READ_ANDX request.
* <a href="http://msdn.microsoft.com/en-us/library/ee441839.aspx">MS-CIFS 2.2.4.42.1</a>,
* <a href="http://msdn.microsoft.com/en-us/library/ff470250.aspx">MS-SMB 2.2.4.2.1</a>
* @see smb1cli_readx_recv()
* @todo fix API (min/max size, timeout)
*
* @param[in] mem_ctx The memory context for the result.
* @param[in] ev The event context to work on.
* @param[in] conn The smb connection.
* @param[in] timeout_msec If positiv a timeout for the request.
* @param[in] pid The process identifier
* @param[in] tcon The smb tree connect.
* @param[in] session The smb session.
* @param[in] fnum The file id of the file the data should be read from.
* @param[in] offset The offset in bytes from the begin of file where to start reading.
* @param[in] size The number of bytes to read.
*
* @return a tevent_req or NULL
*/
struct tevent_req *smb1cli_readx_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct smbXcli_conn *conn,
uint32_t timeout_msec,
uint32_t pid,
struct smbXcli_tcon *tcon,
struct smbXcli_session *session,
uint16_t fnum,
uint64_t offset,
uint32_t size)
{
NTSTATUS status;
struct tevent_req *req, *subreq;
struct smb1cli_readx_state *state;
uint8_t wct = 10;
req = tevent_req_create(mem_ctx, &state, struct smb1cli_readx_state);
if (req == NULL) {
return NULL;
}
state->size = size;
SCVAL(state->vwv + 0, 0, 0xFF);
SCVAL(state->vwv + 0, 1, 0);
SSVAL(state->vwv + 1, 0, 0);
SSVAL(state->vwv + 2, 0, fnum);
SIVAL(state->vwv + 3, 0, offset);
SSVAL(state->vwv + 5, 0, size);
SSVAL(state->vwv + 6, 0, size);
SSVAL(state->vwv + 7, 0, (size >> 16));
SSVAL(state->vwv + 8, 0, 0);
SSVAL(state->vwv + 9, 0, 0);
if (smb1cli_conn_capabilities(conn) & CAP_LARGE_FILES) {
SIVAL(state->vwv + 10, 0,
(((uint64_t)offset)>>32) & 0xffffffff);
wct = 12;
} else {
if ((((uint64_t)offset) & 0xffffffff00000000LL) != 0) {
DEBUG(10, ("smb1cli_readx_send got large offset where "
"the server does not support it\n"));
tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
return tevent_req_post(req, ev);
}
}
subreq = smb1cli_req_create(state, ev, conn, SMBreadX,
0, 0, /* *_flags */
0, 0, /* *_flags2 */
timeout_msec, pid, tcon, session,
wct, state->vwv,
0, NULL);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, smb1cli_readx_done, req);
status = smb1cli_req_chain_submit(&subreq, 1);
if (tevent_req_nterror(req, status)) {
return tevent_req_post(req, ev);
}
return req;
}
static void smb1cli_readx_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct smb1cli_readx_state *state = tevent_req_data(
req, struct smb1cli_readx_state);
struct iovec *recv_iov = NULL;
uint8_t wct;
uint16_t *vwv;
uint32_t num_bytes;
uint8_t *bytes;
uint16_t data_offset;
uint32_t bytes_offset;
NTSTATUS status;
static const struct smb1cli_req_expected_response expected[] = {
{
.status = NT_STATUS_OK,
.wct = 0x0C
},
{
.status = STATUS_BUFFER_OVERFLOW,
.wct = 0x0C
},
};
status = smb1cli_req_recv(subreq, state,
&recv_iov,
NULL, /* phdr */
&wct,
&vwv,
NULL, /* pvwv_offset */
&num_bytes,
&bytes,
&bytes_offset,
NULL, /* inbuf */
expected, ARRAY_SIZE(expected));
TALLOC_FREE(subreq);
if (NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
/* no error */
} else {
if (tevent_req_nterror(req, status)) {
return;
}
}
/* size is the number of bytes the server returned.
* Might be zero. */
state->received = SVAL(vwv + 5, 0);
state->received |= (((unsigned int)SVAL(vwv + 7, 0)) << 16);
if (state->received > state->size) {
DEBUG(5,("server returned more than we wanted!\n"));
tevent_req_nterror(req, NT_STATUS_UNEXPECTED_IO_ERROR);
return;
}
/*
* bcc field must be valid for small reads, for large reads the 16-bit
* bcc field can't be correct.
*/
if ((state->received < 0xffff) && (state->received > num_bytes)) {
DEBUG(5, ("server announced more bytes than sent\n"));
tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
return;
}
data_offset = SVAL(vwv+6, 0);
if (data_offset < bytes_offset) {
DEBUG(5, ("server returned invalid read&x data offset\n"));
tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
return;
}
if (smb_buffer_oob(num_bytes, data_offset - bytes_offset, state->received)) {
DEBUG(5, ("server returned invalid read&x data offset\n"));
tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
return;
}
state->buf = bytes + (data_offset - bytes_offset);
state->out_valid = true;
if (tevent_req_nterror(req, status)) {
return;
}
tevent_req_done(req);
}
/**
* Receive the response to an asynchronous SMB_COM_READ_ANDX request.
* <a href="http://msdn.microsoft.com/en-us/library/ee441872.aspx">MS-CIFS 2.2.4.42.2</a>,
* <a href="http://msdn.microsoft.com/en-us/library/ff470017.aspx">MS-SMB 2.2.4.2.2</a>
*
* @warning rcvbuf is talloced from the request, so better make sure that you
* copy it away before you talloc_free(req). rcvbuf is NOT a talloc_ctx of its
* own, so do not talloc_move it!
*
* @param[in] req A tevent request created with smb1cli_readx_send()
* @param[out] received The number of bytes received.
* @param[out] rcvbuf Pointer to the bytes received.
*
* @return NT_STATUS_OK or STATUS_BUFFER_OVERFLOW on succsess.
*/
NTSTATUS smb1cli_readx_recv(struct tevent_req *req,
uint32_t *received,
uint8_t **rcvbuf)
{
struct smb1cli_readx_state *state = tevent_req_data(
req, struct smb1cli_readx_state);
NTSTATUS status = NT_STATUS_OK;
if (tevent_req_is_nterror(req, &status) && !state->out_valid) {
*received = 0;
*rcvbuf = NULL;
return status;
}
*received = state->received;
*rcvbuf = state->buf;
return status;
}
|
