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
|
/*
SSSD
Service monitor
Copyright (C) Simo Sorce 2008
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 <sys/types.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <time.h>
#include "../events/events.h"
#include "util/util.h"
#include "service.h"
#include "confdb/confdb.h"
#include "monitor.h"
#include "dbus/dbus.h"
#include "dbus/sssd_dbus.h"
/* TODO: get this value from LDB */
#define DBUS_ADDRESS "unix:path=/var/lib/sss/pipes/private/dbus"
struct mt_ctx {
struct event_context *ev;
struct confdb_ctx *cdb;
char **services;
};
struct mt_srv {
const char *name;
struct mt_ctx *mt_ctx;
pid_t pid;
time_t last_restart;
int restarts;
};
/* dbus_get_monitor_version
* Return the monitor version over D-BUS */
static int dbus_get_monitor_version(DBusMessage *message,
void *data,
DBusMessage **r)
{
const char *version = MONITOR_VERSION;
DBusMessage *reply;
dbus_bool_t ret;
reply = dbus_message_new_method_return(message);
ret = dbus_message_append_args(reply, DBUS_TYPE_STRING,
&version, DBUS_TYPE_INVALID);
if (!ret) {
return EIO;
}
*r = reply;
return EOK;
}
struct sssd_dbus_method monitor_methods[] = {
{ MONITOR_METHOD_VERSION, dbus_get_monitor_version},
{NULL, NULL}
};
/* monitor_dbus_init
* Set up the monitor service as a D-BUS Server */
static int monitor_dbus_init(struct mt_ctx *ctx)
{
struct sssd_dbus_ctx *sd_ctx;
int ret;
sd_ctx = talloc(ctx, struct sssd_dbus_ctx);
if (!sd_ctx) {
return ENOMEM;
}
sd_ctx->ev = ctx->ev;
sd_ctx->name = talloc_strdup(sd_ctx, MONITOR_DBUS_INTERFACE);
if (!sd_ctx->name) {
talloc_free(sd_ctx);
return ENOMEM;
}
sd_ctx->path = talloc_strdup(sd_ctx, MONITOR_DBUS_PATH);
if (!sd_ctx->path) {
talloc_free(sd_ctx);
return ENOMEM;
}
sd_ctx->methods = monitor_methods;
ret = sssd_new_dbus_server(sd_ctx, DBUS_ADDRESS);
return ret;
}
static void set_tasks_checker(struct mt_srv *srv);
static void tasks_check_handler(struct event_context *ev,
struct timed_event *te,
struct timeval t, void *ptr)
{
struct mt_srv *srv = talloc_get_type(ptr, struct mt_srv);
time_t now = time(NULL);
int status;
pid_t pid;
int ret;
pid = waitpid(srv->pid, &status, WNOHANG);
if (pid == 0) {
set_tasks_checker(srv);
return;
}
if (pid != srv->pid) {
DEBUG(1, ("bad return (%d) from waitpid() waiting for %d\n",
pid, srv->pid));
/* TODO: what do we do now ? */
}
if (WIFEXITED(status)) { /* children exited on it's own ?? */
/* TODO: check configuration to see if it was removed
* from the list of process to run */
DEBUG(0,("Process [%s] exited on it's own ?!\n", srv->name));
}
if (srv->last_restart != 0) {
if ((now - srv->last_restart) > 30) { /* TODO: get val from config */
/* it was long ago reset restart threshold */
srv->restarts = 0;
}
}
/* restart the process */
if (srv->restarts < 3) { /* TODO: get val from config */
ret = server_service_init(srv->name, srv->mt_ctx->ev, &srv->pid);
if (ret != EOK) {
DEBUG(0,("Failed to restart service '%s'\n", srv->name));
talloc_free(srv);
return;
}
srv->restarts++;
srv->last_restart = now;
set_tasks_checker(srv);
return;
}
DEBUG(0, ("Process [%s], definitely stopped!\n", srv->name));
talloc_free(srv);
}
static void set_tasks_checker(struct mt_srv *srv)
{
struct timed_event *te = NULL;
struct timeval tv;
gettimeofday(&tv, NULL);
tv.tv_sec += 2;
tv.tv_usec = 0;
te = event_add_timed(srv->mt_ctx->ev, srv, tv, tasks_check_handler, srv);
if (te == NULL) {
DEBUG(0, ("failed to add event, monitor offline for [%s]!\n",
srv->name));
/* FIXME: shutdown ? */
}
}
int start_monitor(TALLOC_CTX *mem_ctx,
struct event_context *event_ctx,
struct confdb_ctx *cdb)
{
struct mt_ctx *ctx;
struct mt_srv *srv;
int ret, i;
ctx = talloc_zero(mem_ctx, struct mt_ctx);
if (!ctx) {
DEBUG(0, ("fatal error initializing monitor!\n"));
return ENOMEM;
}
ctx->ev = event_ctx;
ret = confdb_get_param(cdb, mem_ctx, "config.services",
"activeServices", &ctx->services);
if (ctx->services[0] == NULL) {
DEBUG(0, ("No services configured!\n"));
return EINVAL;
}
/* Initialize D-BUS Server
* The monitor will act as a D-BUS server for all
* SSSD processes */
ret = monitor_dbus_init(ctx);
if (ret != EOK) {
return ret;
}
for (i = 0; ctx->services[i]; i++) {
srv = talloc_zero(ctx, struct mt_srv);
if (!srv) {
talloc_free(ctx);
return ENOMEM;
}
srv->name = ctx->services[i];
srv->mt_ctx = ctx;
ret = server_service_init(srv->name, event_ctx, &srv->pid);
if (ret != EOK) {
DEBUG(0,("Failed to restart service '%s'\n", srv->name));
talloc_free(srv);
}
set_tasks_checker(srv);
}
return EOK;
}
|
