1 /*
2 Unix SMB/CIFS implementation.
3
4 SMB2 client read call
5
6 Copyright (C) Andrew Tridgell 2005
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23 #include "libcli/smb2/smb2.h"
24 #include "libcli/smb2/smb2_calls.h"
25
26 /*
27 send a read request
28 */
smb2_read_send(struct smb2_tree * tree,struct smb2_read * io)29 struct smb2_request *smb2_read_send(struct smb2_tree *tree, struct smb2_read *io)
30 {
31 struct smb2_request *req;
32
33 req = smb2_request_init_tree(tree, SMB2_OP_READ, 0x30, true, 0);
34 if (req == NULL) return NULL;
35
36 SCVAL(req->out.body, 0x02, 0); /* pad */
37 SCVAL(req->out.body, 0x03, 0); /* reserved */
38 SIVAL(req->out.body, 0x04, io->in.length);
39 SBVAL(req->out.body, 0x08, io->in.offset);
40 smb2_push_handle(req->out.body+0x10, &io->in.file.handle);
41 SIVAL(req->out.body, 0x20, io->in.min_count);
42 SIVAL(req->out.body, 0x24, io->in.channel);
43 SIVAL(req->out.body, 0x28, io->in.remaining);
44 SSVAL(req->out.body, 0x2C, io->in.channel_offset);
45 SSVAL(req->out.body, 0x2E, io->in.channel_length);
46
47 req->credit_charge = (MAX(io->in.length, 1) - 1)/ 65536 + 1;
48
49 smb2_transport_send(req);
50
51 return req;
52 }
53
54
55 /*
56 recv a read reply
57 */
smb2_read_recv(struct smb2_request * req,TALLOC_CTX * mem_ctx,struct smb2_read * io)58 NTSTATUS smb2_read_recv(struct smb2_request *req,
59 TALLOC_CTX *mem_ctx, struct smb2_read *io)
60 {
61 NTSTATUS status;
62
63 if (!smb2_request_receive(req) ||
64 !smb2_request_is_ok(req)) {
65 return smb2_request_destroy(req);
66 }
67
68 SMB2_CHECK_PACKET_RECV(req, 0x10, true);
69
70 status = smb2_pull_o16s32_blob(&req->in, mem_ctx, req->in.body+0x02, &io->out.data);
71 if (!NT_STATUS_IS_OK(status)) {
72 smb2_request_destroy(req);
73 return status;
74 }
75
76 io->out.remaining = IVAL(req->in.body, 0x08);
77 io->out.reserved = IVAL(req->in.body, 0x0C);
78
79 return smb2_request_destroy(req);
80 }
81
82 /*
83 sync read request
84 */
smb2_read(struct smb2_tree * tree,TALLOC_CTX * mem_ctx,struct smb2_read * io)85 NTSTATUS smb2_read(struct smb2_tree *tree, TALLOC_CTX *mem_ctx, struct smb2_read *io)
86 {
87 struct smb2_request *req = smb2_read_send(tree, io);
88 return smb2_read_recv(req, mem_ctx, io);
89 }
90