summaryrefslogtreecommitdiff
path: root/source3/libsmb/clioplock.c
blob: 78e93a4f3168a1574cca650f71c5024dda5e31a1 (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
/* 
   Unix SMB/CIFS implementation.
   SMB client oplock functions
   Copyright (C) Andrew Tridgell 2001
   
   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 "async_smb.h"

/****************************************************************************
send an ack for an oplock break request
****************************************************************************/

struct cli_oplock_ack_state {
	uint16_t vwv[8];
};

static void cli_oplock_ack_done(struct tevent_req *subreq);

struct tevent_req *cli_oplock_ack_send(TALLOC_CTX *mem_ctx,
				       struct tevent_context *ev,
				       struct cli_state *cli,
				       uint16_t fnum, uint8_t level)
{
	struct tevent_req *req, *subreq;
	struct cli_oplock_ack_state *state;

	req = tevent_req_create(mem_ctx, &state, struct cli_oplock_ack_state);
	if (req == NULL) {
		return NULL;
	}
	SCVAL(state->vwv+0, 0, 0xff);
	SCVAL(state->vwv+0, 1, 0);
	SSVAL(state->vwv+1, 0, 0);
	SSVAL(state->vwv+2, 0, fnum);
	SCVAL(state->vwv+3, 0, LOCKING_ANDX_OPLOCK_RELEASE);
	SCVAL(state->vwv+3, 1, level);
	SIVAL(state->vwv+4, 0, 0); /* timeout */
	SSVAL(state->vwv+6, 0, 0); /* unlockcount */
	SSVAL(state->vwv+7, 0, 0); /* lockcount */

	subreq = cli_smb_send(state, ev, cli, SMBlockingX, 0, 8, state->vwv,
			      0, NULL);
	if (tevent_req_nomem(subreq, req)) {
		return tevent_req_post(req, ev);
	}
	tevent_req_set_callback(subreq, cli_oplock_ack_done, req);
	return req;
}

static void cli_oplock_ack_done(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(
		subreq, struct tevent_req);
	NTSTATUS status;

	status = cli_smb_recv(subreq, NULL, NULL, 0, NULL, NULL, NULL, NULL);
	TALLOC_FREE(subreq);
	if (!NT_STATUS_IS_OK(status)) {
		tevent_req_nterror(req, status);
		return;
	}
	tevent_req_done(req);
}

NTSTATUS cli_oplock_ack_recv(struct tevent_req *req)
{
	return tevent_req_simple_recv_ntstatus(req);
}

NTSTATUS cli_oplock_ack(struct cli_state *cli, uint16_t fnum, unsigned char level)
{
	TALLOC_CTX *frame = talloc_stackframe();
	struct event_context *ev;
	struct tevent_req *req;
	NTSTATUS status = NT_STATUS_OK;

	if (cli_has_async_calls(cli)) {
		/*
		 * Can't use sync call while an async call is in flight
		 */
		status = NT_STATUS_INVALID_PARAMETER;
		goto fail;
	}

	ev = event_context_init(frame);
	if (ev == NULL) {
		status = NT_STATUS_NO_MEMORY;
		goto fail;
	}

	req = cli_oplock_ack_send(frame, ev, cli, fnum, level);
	if (req == NULL) {
		status = NT_STATUS_NO_MEMORY;
		goto fail;
	}

	if (!tevent_req_poll(req, ev)) {
		status = map_nt_error_from_unix(errno);
		goto fail;
	}

	status = cli_oplock_ack_recv(req);
 fail:
	TALLOC_FREE(frame);
	if (!NT_STATUS_IS_OK(status)) {
		cli_set_error(cli, status);
	}
	return status;
}

/****************************************************************************
set the oplock handler for a connection
****************************************************************************/

void cli_oplock_handler(struct cli_state *cli, 
			NTSTATUS (*handler)(struct cli_state *, uint16_t, unsigned char))
{
	cli->oplock_handler = handler;
}