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/*
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;
}
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);
}
/* 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;
}
return EOK;
}
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