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
|
/*
Unix SMB/CIFS implementation.
smb2 lib
Copyright (C) Volker Lendecke 2011
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 smb2cli_read_state {
uint8_t fixed[48];
uint8_t dyn_pad[1];
struct iovec *recv_iov;
uint8_t *data;
uint32_t data_length;
};
static void smb2cli_read_done(struct tevent_req *subreq);
struct tevent_req *smb2cli_read_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct smbXcli_conn *conn,
uint32_t timeout_msec,
struct smbXcli_session *session,
struct smbXcli_tcon *tcon,
uint32_t length,
uint64_t offset,
uint64_t fid_persistent,
uint64_t fid_volatile,
uint64_t minimum_count,
uint64_t remaining_bytes)
{
struct tevent_req *req, *subreq;
struct smb2cli_read_state *state;
uint8_t *fixed;
req = tevent_req_create(mem_ctx, &state,
struct smb2cli_read_state);
if (req == NULL) {
return NULL;
}
fixed = state->fixed;
SSVAL(fixed, 0, 49);
SIVAL(fixed, 4, length);
SBVAL(fixed, 8, offset);
SBVAL(fixed, 16, fid_persistent);
SBVAL(fixed, 24, fid_volatile);
SBVAL(fixed, 32, minimum_count);
SBVAL(fixed, 40, remaining_bytes);
subreq = smb2cli_req_send(state, ev, conn, SMB2_OP_READ,
0, 0, /* flags */
timeout_msec,
tcon,
session,
state->fixed, sizeof(state->fixed),
state->dyn_pad, sizeof(state->dyn_pad),
length); /* max_dyn_len */
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, smb2cli_read_done, req);
return req;
}
static void smb2cli_read_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct smb2cli_read_state *state =
tevent_req_data(req,
struct smb2cli_read_state);
NTSTATUS status;
struct iovec *iov;
uint8_t data_offset;
static const struct smb2cli_req_expected_response expected[] = {
{
.status = STATUS_BUFFER_OVERFLOW,
.body_size = 0x11
},
{
.status = NT_STATUS_OK,
.body_size = 0x11
}
};
status = smb2cli_req_recv(subreq, state, &iov,
expected, ARRAY_SIZE(expected));
TALLOC_FREE(subreq);
if (tevent_req_nterror(req, status)) {
return;
}
data_offset = CVAL(iov[1].iov_base, 2);
state->data_length = IVAL(iov[1].iov_base, 4);
if ((data_offset != SMB2_HDR_BODY + 16) ||
(state->data_length > iov[2].iov_len)) {
tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
return;
}
state->recv_iov = iov;
state->data = (uint8_t *)iov[2].iov_base;
tevent_req_done(req);
}
NTSTATUS smb2cli_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
uint8_t **data, uint32_t *data_length)
{
struct smb2cli_read_state *state =
tevent_req_data(req,
struct smb2cli_read_state);
NTSTATUS status;
if (tevent_req_is_nterror(req, &status)) {
return status;
}
talloc_steal(mem_ctx, state->recv_iov);
*data_length = state->data_length;
*data = state->data;
return NT_STATUS_OK;
}
NTSTATUS smb2cli_read(struct smbXcli_conn *conn,
uint32_t timeout_msec,
struct smbXcli_session *session,
struct smbXcli_tcon *tcon,
uint32_t length,
uint64_t offset,
uint64_t fid_persistent,
uint64_t fid_volatile,
uint64_t minimum_count,
uint64_t remaining_bytes,
TALLOC_CTX *mem_ctx,
uint8_t **data,
uint32_t *data_length)
{
TALLOC_CTX *frame = talloc_stackframe();
struct tevent_context *ev;
struct tevent_req *req;
NTSTATUS status = NT_STATUS_NO_MEMORY;
if (smbXcli_conn_has_async_calls(conn)) {
/*
* Can't use sync call while an async call is in flight
*/
status = NT_STATUS_INVALID_PARAMETER;
goto fail;
}
ev = samba_tevent_context_init(frame);
if (ev == NULL) {
goto fail;
}
req = smb2cli_read_send(frame, ev,
conn, timeout_msec, session, tcon,
length, offset,
fid_persistent, fid_volatile,
minimum_count, remaining_bytes);
if (req == NULL) {
goto fail;
}
if (!tevent_req_poll_ntstatus(req, ev, &status)) {
goto fail;
}
status = smb2cli_read_recv(req, mem_ctx, data, data_length);
fail:
TALLOC_FREE(frame);
return status;
}
|
