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
|
/*
Authors:
Pavel Březina <pbrezina@redhat.com>
Stephen Gallagher <sgallagh@redhat.com>
Simo Sorce <ssorce@redhat.com>
Copyright (C) 2017 Red Hat
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 <errno.h>
#include <tevent.h>
#include <talloc.h>
#include <dbus/dbus.h>
#include "util/util.h"
#include "sbus/sbus_private.h"
static errno_t
sbus_pending_call_create(DBusConnection *conn,
DBusMessage *msg,
DBusPendingCallNotifyFunction notify_fn,
void *notify_data,
int timeout_ms,
DBusPendingCall **_pending_call)
{
DBusPendingCall *pending;
dbus_bool_t dbret;
dbret = dbus_connection_send_with_reply(conn, msg, &pending, timeout_ms);
if (!dbret) {
DEBUG(SSSDBG_FATAL_FAILURE, "Unable to create pending call!\n");
return ENOMEM;
}
if (pending == NULL) {
/* Connection may have been disconnected. */
return ERR_OFFLINE;
}
dbret = dbus_pending_call_set_notify(pending, notify_fn, notify_data, NULL);
if (!dbret) {
DEBUG(SSSDBG_FATAL_FAILURE,
"Unable to setup callback for pending reply!\n");
dbus_pending_call_cancel(pending);
dbus_pending_call_unref(pending);
return ENOMEM;
}
*_pending_call = pending;
return EOK;
}
static errno_t
sbus_pending_call_process(DBusPendingCall *pending,
DBusMessage **_reply)
{
DBusMessage *reply;
DBusError error;
errno_t ret;
dbus_error_init(&error);
reply = dbus_pending_call_steal_reply(pending);
if (reply == NULL) {
DEBUG(SSSDBG_FATAL_FAILURE, "Severe error. A reply callback was "
"called but no reply was received and no timeout occurred\n");
ret = EFAULT;
goto done;
}
ret = sbus_reply_check(reply);
if (ret != EOK) {
dbus_message_unref(reply);
goto done;
}
*_reply = reply;
done:
dbus_pending_call_unref(pending);
dbus_error_free(&error);
return ret;
}
struct sbus_message_state {
DBusPendingCall *pending;
DBusMessage *reply;
};
static int sbus_message_destructor(struct sbus_message_state *state)
{
if (state->pending == NULL) {
return 0;
}
/* This request was interrupted before the pending call has finished. */
dbus_pending_call_cancel(state->pending);
dbus_pending_call_unref(state->pending);
state->pending = NULL;
return 0;
}
static void sbus_message_done(DBusPendingCall *pending,
void *pvt);
struct tevent_req *
sbus_message_send(TALLOC_CTX *mem_ctx,
struct sbus_connection *conn,
DBusMessage *msg,
int timeout_ms)
{
struct sbus_message_state *state;
struct tevent_req *req;
errno_t ret;
req = tevent_req_create(mem_ctx, &state, struct sbus_message_state);
if (req == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, "Unable to create tevent request!\n");
return NULL;
}
if (conn->disconnecting) {
ret = ERR_TERMINATED;
goto done;
}
ret = sbus_pending_call_create(conn->connection, msg, sbus_message_done,
req, timeout_ms, &state->pending);
if (ret != EOK) {
goto done;
}
talloc_set_destructor(state, sbus_message_destructor);
ret = EAGAIN;
done:
if (ret != EAGAIN) {
tevent_req_error(req, ret);
tevent_req_post(req, conn->ev);
}
return req;
}
static void
sbus_message_done(DBusPendingCall *pending,
void *pvt)
{
struct sbus_message_state *state;
struct tevent_req *req;
errno_t ret;
req = talloc_get_type(pvt, struct tevent_req);
state = tevent_req_data(req, struct sbus_message_state);
/* The pending call has finished. Remove the destructor. */
state->pending = NULL;
talloc_set_destructor(state, NULL);
ret = sbus_pending_call_process(pending, &state->reply);
if (ret != EOK) {
tevent_req_error(req, ret);
return;
}
tevent_req_done(req);
}
errno_t
sbus_message_recv(TALLOC_CTX *mem_ctx,
struct tevent_req *req,
DBusMessage **_reply)
{
struct sbus_message_state *state;
errno_t ret;
state = tevent_req_data(req, struct sbus_message_state);
TEVENT_REQ_RETURN_ON_ERROR(req);
ret = sbus_message_bound(mem_ctx, state->reply);
if (ret != EOK) {
return ret;
}
*_reply = state->reply;
return EOK;
}
void sbus_reply(struct sbus_connection *conn,
DBusMessage *reply)
{
if (conn->disconnecting) {
dbus_message_unref(reply);
return;
}
dbus_connection_send(conn->connection, reply, NULL);
dbus_message_unref(reply);
}
void sbus_reply_error(struct sbus_connection *conn,
DBusMessage *reply_to,
const char *error_name,
const char *error_message)
{
DBusMessage *reply;
/* We can|t really send reply to a signal. */
if (dbus_message_get_type(reply_to) == DBUS_MESSAGE_TYPE_SIGNAL) {
return;
}
reply = dbus_message_new_error(reply_to, error_name, error_message);
if (reply == NULL) {
/* There is really nothing we can do. */
return;
}
sbus_reply(conn, reply);
}
void sbus_emit_signal(struct sbus_connection *conn,
DBusMessage *msg)
{
sbus_reply(conn, msg);
}
|
