/*
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/>.
*/
#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/param.h>
#include <time.h>
#include <string.h>
#include "config.h"
#ifdef HAVE_SYS_INOTIFY_H
#include <sys/inotify.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
/* Needed for res_init() */
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include "util/util.h"
#include "popt.h"
#include "tevent.h"
#include "confdb/confdb.h"
#include "confdb/confdb_setup.h"
#include "collection.h"
#include "ini_config.h"
#include "db/sysdb.h"
#include "monitor/monitor.h"
#include "dbus/dbus.h"
#include "sbus/sssd_dbus.h"
#include "monitor/monitor_interfaces.h"
/* ping time cannot be less then once every few seconds or the
* monitor will get crazy hammering children with messages */
#define MONITOR_DEF_PING_TIME 10
struct svc_spy;
struct mt_svc {
struct mt_svc *prev;
struct mt_svc *next;
struct sbus_connection *conn;
struct svc_spy *conn_spy;
struct mt_ctx *mt_ctx;
char *provider;
char *command;
char *name;
char *identity;
pid_t pid;
int ping_time;
bool svc_started;
int restarts;
time_t last_restart;
time_t last_ping;
int failed_pongs;
int debug_level;
struct tevent_timer *ping_ev;
};
struct config_file_callback {
int wd;
int retries;
monitor_reconf_fn fn;
char *filename;
time_t modified;
struct config_file_callback *next;
struct config_file_callback *prev;
};
struct config_file_ctx {
TALLOC_CTX *parent_ctx;
struct tevent_timer *timer;
bool needs_update;
struct mt_ctx *mt_ctx;
struct config_file_callback *callbacks;
};
struct mt_ctx {
struct tevent_context *ev;
struct confdb_ctx *cdb;
TALLOC_CTX *domain_ctx; /* Memory context for domain list */
struct sss_domain_info *domains;
TALLOC_CTX *service_ctx; /* Memory context for services */
char **services;
struct mt_svc *svc_list;
struct sbus_connection *sbus_srv;
struct config_file_ctx *file_ctx;
int inotify_fd;
int service_id_timeout;
bool check_children;
bool services_started;
struct netlink_ctx *nlctx;
};
static int start_service(struct mt_svc *mt_svc);
static int monitor_service_init(struct sbus_connection *conn, void *data);
static int service_send_ping(struct mt_svc *svc);
static int service_signal_reset_offline(struct mt_svc *svc);
static void ping_check(DBusPendingCall *pending, void *data);
static int service_check_alive(struct mt_svc *svc);
static void set_tasks_checker(struct mt_svc *srv);
static void set_global_checker(struct mt_ctx *ctx);
static int monitor_kill_service (struct mt_svc *svc);
static int get_service_config(struct mt_ctx *ctx, const char *name,
struct mt_svc **svc_cfg);
static int get_provider_config(struct mt_ctx *ctx, const char *name,
struct mt_svc **svc_cfg);
static int add_new_service(struct mt_ctx *ctx, const char *name);
static int add_new_provider(struct mt_ctx *ctx, const char *name);
static int mark_service_as_started(struct mt_svc *svc);
static int monitor_cleanup(void);
static void network_status_change_cb(enum network_change state,
void *cb_data)
{
struct mt_svc *iter;
struct mt_ctx *ctx = (struct mt_ctx *) cb_data;
if (state != NL_ROUTE_UP) return;
DEBUG(9, ("A new route has appeared, signaling providers to reset offline status\n"));
for (iter = ctx->svc_list; iter; iter = iter->next) {
/* Don't signal services, only providers */
if (iter->provider) {
service_signal_reset_offline(iter);
}
}
}
/* dbus_get_monitor_version
* Return the monitor version over D-BUS */
static int get_monitor_version(DBusMessage *message,
struct sbus_connection *conn)
{
dbus_uint16_t version = MONITOR_VERSION;
DBusMessage *reply;
dbus_bool_t ret;
reply = dbus_message_new_method_return(message);
if (!reply) return ENOMEM;
ret = dbus_message_append_args(reply,
DBUS_TYPE_UINT16, &version,
DBUS_TYPE_INVALID);
if (!ret) {
dbus_message_unref(reply);
return EIO;
}
/* send reply back */
sbus_conn_send_reply(conn, reply);
dbus_message_unref(reply);
return EOK;
}
struct mon_init_conn {
struct mt_ctx *ctx;
struct sbus_connection *conn;
struct tevent_timer *timeout;
};
static int add_svc_conn_spy(struct mt_svc *svc);
/* registers a new client.
* if operation is successful also sends back the Monitor version */
static int client_registration(DBusMessage *message,
struct sbus_connection *conn)
{
dbus_uint16_t version = MONITOR_VERSION;
struct mon_init_conn *mini;
struct mt_svc *svc;
void *data;
DBusMessage *reply;
DBusError dbus_error;
dbus_uint16_t svc_ver;
char *svc_name;
dbus_bool_t dbret;
int ret;
data = sbus_conn_get_private_data(conn);
mini = talloc_get_type(data, struct mon_init_conn);
if (!mini) {
DEBUG(0, ("Connection holds no valid init data\n"));
return EINVAL;
}
/* First thing, cancel the timeout */
talloc_zfree(mini->timeout);
dbus_error_init(&dbus_error);
dbret = dbus_message_get_args(message, &dbus_error,
DBUS_TYPE_STRING, &svc_name,
DBUS_TYPE_UINT16, &svc_ver,
DBUS_TYPE_INVALID);
if (!dbret) {
DEBUG(1, ("Failed to parse message, killing connection\n"));
if (dbus_error_is_set(&dbus_error)) dbus_error_free(&dbus_error);
sbus_disconnect(conn);
/* FIXME: should we just talloc_zfree(conn) ? */
goto done;
}
DEBUG(4, ("Received ID registration: (%s,%d)\n", svc_name, svc_ver));
/* search this service in the list */
svc = mini->ctx->svc_list;
while (svc) {
ret = strcasecmp(svc->identity, svc_name);
if (ret == 0) {
break;
}
svc = svc->next;
}
if (!svc) {
DEBUG(0, ("Unable to find peer [%s] in list of services,"
" killing connection!\n", svc_name));
sbus_disconnect(conn);
/* FIXME: should we just talloc_zfree(conn) ? */
goto done;
}
/* Fill in svc structure with connection data */
svc->conn = mini->conn;
ret = mark_service_as_started(svc);
if (ret) {
DEBUG(1, ("Failed to mark service [%s]!\n", svc_name));
goto done;
}
/* reply that all is ok */
reply = dbus_message_new_method_return(message);
if (!reply) return ENOMEM;
dbret = dbus_message_append_args(reply,
DBUS_TYPE_UINT16, &version,
DBUS_TYPE_INVALID);
if (!dbret) {
dbus_message_unref(reply);
return EIO;
}
/* send reply back */
sbus_conn_send_reply(conn, reply);
dbus_message_unref(reply);
done:
/* init complete, get rid of temp init context */
talloc_zfree(mini);
return EOK;
}
struct svc_spy {
struct mt_svc *svc;
};
static int svc_destructor(void *mem)
{
struct mt_svc *svc = talloc_get_type(mem, struct mt_svc);
if (!svc) {
/* ?!?!? */
return 0;
}
/* try to delist service */
if (svc->mt_ctx) {
DLIST_REMOVE(svc->mt_ctx->svc_list, svc);
}
/* svc is beeing freed, neutralize the spy */
if (svc->conn_spy) {
talloc_set_destructor((TALLOC_CTX *)svc->conn_spy, NULL);
talloc_zfree(svc->conn_spy);
}
return 0;
}
static int svc_spy_destructor(void *mem)
{
struct svc_spy *spy = talloc_get_type(mem, struct svc_spy);
if (!spy) {
/* ?!?!? */
return 0;
}
/* svc->conn has been freed, NULL the pointer in svc */
spy->svc->conn_spy = NULL;
spy->svc->conn = NULL;
return 0;
}
static int add_svc_conn_spy(struct mt_svc *svc)
{
struct svc_spy *spy;
spy = talloc(svc->conn, struct svc_spy);
if (!spy) return ENOMEM;
spy->svc = svc;
talloc_set_destructor((TALLOC_CTX *)spy, svc_spy_destructor);
svc->conn_spy = spy;
return EOK;
}
static int mark_service_as_started(struct mt_svc *svc)
{
struct mt_ctx *ctx = svc->mt_ctx;
struct mt_svc *iter;
int ret;
int i;
DEBUG(5, ("Marking %s as started.\n", svc->name));
svc->svc_started = true;
/* we need to attach a spy to the connection structure so that if some code
* frees it we can zero it out in the service structure. Otherwise we may
* try to access or even free, freed memory. */
ret = add_svc_conn_spy(svc);
if (ret) {
DEBUG(0, ("Failed to attch spy\n"));
goto done;
}
if (!ctx->services_started) {
/* check if all providers are up */
for (iter = ctx->svc_list; iter; iter = iter->next) {
if (iter->provider && !iter->svc_started) {
DEBUG(5, ("Still waiting on %s provider.\n", iter->name));
break;
}
}
if (iter) {
/* there are still unstarted providers */
goto done;
}
ctx->services_started = true;
DEBUG(4, ("Now starting services!\n"));
/* then start all services */
for (i = 0; ctx->services[i]; i++) {
add_new_service(ctx, ctx->services[i]);
}
}
done:
return ret;
}
static void services_startup_timeout(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval t, void *ptr)
{
struct mt_ctx *ctx = talloc_get_type(ptr, struct mt_ctx);
int i;
DEBUG(6, ("Handling timeout\n"));
if (!ctx->services_started) {
DEBUG(1, ("Providers did not start in time, "
"forcing services startup!\n"));
ctx->services_started = true;
DEBUG(4, ("Now starting services!\n"));
/* then start all services */
for (i = 0; ctx->services[i]; i++) {
add_new_service(ctx, ctx->services[i]);
}
}
}
static int add_services_startup_timeout(struct mt_ctx *ctx)
{
struct tevent_timer *to;
struct timeval tv;
/* 5 seconds should be plenty */
tv = tevent_timeval_current_ofs(5, 0);
to = tevent_add_timer(ctx->ev, ctx, tv, services_startup_timeout, ctx);
if (!to) {
DEBUG(0,("Out of memory?!\n"));
return ENOMEM;
}
return EOK;
}
struct sbus_method monitor_methods[] = {
{ MON_SRV_METHOD_VERSION, get_monitor_version },
{ MON_SRV_METHOD_REGISTER, client_registration },
{ NULL, NULL }
};
struct sbus_interface monitor_server_interface = {
MON_SRV_INTERFACE,
MON_SRV_PATH,
SBUS_DEFAULT_VTABLE,
monitor_methods,
NULL
};
/* monitor_dbus_init
* Set up the monitor service as a D-BUS Server */
static int monitor_dbus_init(struct mt_ctx *ctx)
{
char *monitor_address;
int ret;
ret = monitor_get_sbus_address(ctx, &monitor_address);
if (ret != EOK) {
return ret;
}
ret = sbus_new_server(ctx, ctx->ev,
monitor_address, &monitor_server_interface,
&ctx->sbus_srv, monitor_service_init, ctx);
talloc_free(monitor_address);
return ret;
}
static void svc_try_restart(struct mt_svc *svc, time_t now)
{
int ret;
DLIST_REMOVE(svc->mt_ctx->svc_list, svc);
if (svc->last_restart != 0) {
if ((now - svc->last_restart) > 30) { /* TODO: get val from config */
/* it was long ago reset restart threshold */
svc->restarts = 0;
}
}
/* restart the process */
if (svc->restarts > 3) { /* TODO: get val from config */
DEBUG(0, ("Process [%s], definitely stopped!\n", svc->name));
talloc_free(svc);
return;
}
/* Shut down the current ping timer so it will restart
* cleanly in start_service()
*/
talloc_free(svc->ping_ev);
ret = start_service(svc);
if (ret != EOK) {
DEBUG(0,("Failed to restart service '%s'\n", svc->name));
talloc_free(svc);
return;
}
svc->restarts++;
svc->last_restart = now;
return;
}
static void tasks_check_handler(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval t, void *ptr)
{
struct mt_svc *svc = talloc_get_type(ptr, struct mt_svc);
time_t now = time(NULL);
bool process_alive = true;
int ret;
ret = service_check_alive(svc);
switch (ret) {
case EOK:
/* all fine */
break;
case ECHILD:
DEBUG(1,("Process (%s) is stopped!\n", svc->name));
process_alive = false;
break;
default:
/* TODO: should we tear down it ? */
DEBUG(1,("Checking for service %s(%d) failed!!\n",
svc->name, svc->pid));
break;
}
if (process_alive) {
ret = service_send_ping(svc);
switch (ret) {
case EOK:
/* all fine */
break;
case ENXIO:
DEBUG(1,("Child (%s) not responding! (yet)\n", svc->name));
break;
default:
/* TODO: should we tear it down ? */
DEBUG(1,("Sending a message to service (%s) failed!!\n", svc->name));
break;
}
if (svc->last_ping != 0) {
if ((now - svc->last_ping) > (svc->ping_time)) {
svc->failed_pongs++;
} else {
svc->failed_pongs = 0;
}
if (svc->failed_pongs > 3) {
/* too long since we last heard of this process */
DEBUG(1, ("Killing service [%s], not responding to pings!\n",
svc->name));
monitor_kill_service(svc);
process_alive = false;
}
}
svc->last_ping = now;
}
if (!process_alive) {
svc_try_restart(svc, now);
return;
}
/* all fine, set up the task checker again */
set_tasks_checker(svc);
}
static void set_tasks_checker(struct mt_svc *svc)
{
struct tevent_timer *te = NULL;
struct timeval tv;
gettimeofday(&tv, NULL);
tv.tv_sec += svc->ping_time;
tv.tv_usec = 0;
te = tevent_add_timer(svc->mt_ctx->ev, svc, tv, tasks_check_handler, svc);
if (te == NULL) {
DEBUG(0, ("failed to add event, monitor offline for [%s]!\n",
svc->name));
/* FIXME: shutdown ? */
}
svc->ping_ev = te;
}
static void global_checks_handler(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval t, void *ptr)
{
struct mt_ctx *ctx = talloc_get_type(ptr, struct mt_ctx);
struct mt_svc *svc;
int status;
pid_t pid;
if (!ctx->check_children) {
goto done;
}
errno = 0;
pid = waitpid(0, &status, WNOHANG);
if (pid == 0) {
goto done;
}
if (pid == -1) {
DEBUG(0, ("waitpid returned -1 (errno:%d[%s])\n",
errno, strerror(errno)));
goto done;
}
/* let's see if it is a known service, and try to restart it */
for (svc = ctx->svc_list; svc; svc = svc->next) {
if (svc->pid == pid) {
time_t now = time(NULL);
DEBUG(1, ("Service [%s] did exit\n", svc->name));
svc_try_restart(svc, now);
goto done;
}
}
if (svc == NULL) {
DEBUG(0, ("Unknown child (%d) did exit\n", pid));
}
done:
set_global_checker(ctx);
}
static void set_global_checker(struct mt_ctx *ctx)
{
struct tevent_timer *te = NULL;
struct timeval tv;
gettimeofday(&tv, NULL);
tv.tv_sec += 1; /* once a second */
tv.tv_usec = 0;
te = tevent_add_timer(ctx->ev, ctx, tv, global_checks_handler, ctx);
if (te == NULL) {
DEBUG(0, ("failed to add global checker event! PANIC TIME!\n"));
/* FIXME: is this right ? shoulkd we try to clean up first ?*/
exit(-1);
}
}
static int monitor_kill_service (struct mt_svc *svc)
{
int ret;
ret = kill(svc->pid, SIGTERM);
if (ret != EOK) {
DEBUG(0,("Sending signal to child (%s:%d) failed! "
"Ignore and pretend child is dead.\n",
svc->name, svc->pid));
}
return ret;
}
static void reload_reply(DBusPendingCall *pending, void *data)
{
DBusMessage *reply;
struct mt_svc *svc = talloc_get_type(data, struct mt_svc);
reply = dbus_pending_call_steal_reply(pending);
if (!reply) {
/* reply should never be null. This function shouldn't be called
* until reply is valid or timeout has occurred. If reply is NULL
* here, something is seriously wrong and we should bail out.
*/
DEBUG(0, ("A reply callback was called but no reply was received"
" and no timeout occurred\n"));
/* Destroy this connection */
sbus_disconnect(svc->conn);
dbus_pending_call_unref(pending);
return;
}
/* TODO: Handle cases where the call has timed out or returned
* with an error.
*/
dbus_pending_call_unref(pending);
dbus_message_unref(reply);
}
static int service_signal_dns_reload(struct mt_svc *svc);
static int monitor_update_resolv(struct config_file_ctx *file_ctx,
const char *filename)
{
int ret;
struct mt_svc *cur_svc;
DEBUG(2, ("Resolv.conf has been updated. Reloading.\n"));
ret = res_init();
if(ret != 0) {
return EIO;
}
/* Signal all services to reload their DNS configuration */
for(cur_svc = file_ctx->mt_ctx->svc_list; cur_svc; cur_svc = cur_svc->next) {
service_signal_dns_reload(cur_svc);
}
return EOK;
}
static int service_signal(struct mt_svc *svc, const char *svc_signal)
{
DBusMessage *msg;
int ret;
if (svc->provider && strcasecmp(svc->provider, "local") == 0) {
/* The local provider requires no signaling */
return EOK;
}
if (!svc->conn) {
/* Avoid a race condition where we are trying to
* order a service to reload that hasn't started
* yet.
*/
DEBUG(1,("Could not signal service [%s].\n", svc->name));
return EIO;
}
msg = dbus_message_new_method_call(NULL,
MONITOR_PATH,
MONITOR_INTERFACE,
svc_signal);
if (!msg) {
DEBUG(0,("Out of memory?!\n"));
monitor_kill_service(svc);
talloc_free(svc);
return ENOMEM;
}
ret = sbus_conn_send(svc->conn, msg,
svc->mt_ctx->service_id_timeout,
reload_reply, svc, NULL);
dbus_message_unref(msg);
return ret;
}
static int service_signal_dns_reload(struct mt_svc *svc)
{
return service_signal(svc, MON_CLI_METHOD_RES_INIT);
}
static int service_signal_offline(struct mt_svc *svc)
{
return service_signal(svc, MON_CLI_METHOD_OFFLINE);
}
static int service_signal_reset_offline(struct mt_svc *svc)
{
return service_signal(svc, MON_CLI_METHOD_RESET_OFFLINE);
}
static int service_signal_rotate(struct mt_svc *svc)
{
return service_signal(svc, MON_CLI_METHOD_ROTATE);
}
static int check_domain_ranges(struct sss_domain_info *domains)
{
struct sss_domain_info *dom = domains, *other = NULL;
uint32_t id_min, id_max;
while (dom) {
other = dom->next;
if (dom->id_max && dom->id_min > dom->id_max) {
DEBUG(1, ("Domain '%s' does not have a valid ID range\n",
dom->name));
return EINVAL;
}
while (other) {
id_min = MAX(dom->id_min, other->id_min);
id_max = MIN((dom->id_max ? dom->id_max : UINT32_MAX),
(other->id_max ? other->id_max : UINT32_MAX));
if (id_min <= id_max) {
DEBUG(1, ("Domains '%s' and '%s' overlap in range %u - %u\n",
dom->name, other->name, id_min, id_max));
}
other = other->next;
}
dom = dom->next;
}
return EOK;
}
static int check_local_domain_unique(struct sss_domain_info *domains)
{
uint8_t count = 0;
struct sss_domain_info *dom = domains;
while (dom) {
if (strcasecmp(dom->provider, "local") == 0) {
count++;
}
if (count > 1) {
break;
}
dom = dom->next;
}
if (count > 1) {
return EINVAL;
}
return EOK;
}
static char *check_services(char **services)
{
const char *known_services[] = { "nss", "pam", NULL };
int i;
int ii;
/* Check if services we are about to start are in the list if known */
for (i = 0; services[i]; i++) {
for (ii=0; known_services[ii]; ii++) {
if (strcasecmp(services[i], known_services[ii]) == 0) {
break;
}
}
if (known_services[ii] == NULL) {
return services[i];
}
}
return NULL;
}
int get_monitor_config(struct mt_ctx *ctx)
{
int ret;
int timeout_seconds;
char *badsrv = NULL;
ret = confdb_get_int(ctx->cdb, ctx,
CONFDB_MONITOR_CONF_ENTRY,
CONFDB_MONITOR_SBUS_TIMEOUT,
10, &timeout_seconds);
if (ret != EOK) {
return ret;
}
ctx->service_id_timeout = timeout_seconds * 1000; /* service_id_timeout is in ms */
ctx->service_ctx = talloc_new(ctx);
if(!ctx->service_ctx) {
return ENOMEM;
}
ret = confdb_get_string_as_list(ctx->cdb, ctx->service_ctx,
CONFDB_MONITOR_CONF_ENTRY,
CONFDB_MONITOR_ACTIVE_SERVICES,
&ctx->services);
if (ret != EOK) {
DEBUG(0, ("No services configured!\n"));
return EINVAL;
}
badsrv = check_services(ctx->services);
if (badsrv != NULL) {
DEBUG(0, ("Invalid service %s\n", badsrv));
return EINVAL;
}
ctx->domain_ctx = talloc_new(ctx);
if(!ctx->domain_ctx) {
return ENOMEM;
}
ret = confdb_get_domains(ctx->cdb, &ctx->domains);
if (ret != EOK) {
DEBUG(0, ("No domains configured.\n"));
return ret;
}
ret = check_local_domain_unique(ctx->domains);
if (ret != EOK) {
DEBUG(0, ("More than one local domain configured.\n"));
return ret;
}
/* Check UID/GID overlaps */
ret = check_domain_ranges(ctx->domains);
if (ret != EOK) {
return ret;
}
return EOK;
}
static int get_service_config(struct mt_ctx *ctx, const char *name,
struct mt_svc **svc_cfg)
{
int ret;
char *path;
struct mt_svc *svc;
*svc_cfg = NULL;
svc = talloc_zero(ctx, struct mt_svc);
if (!svc) {
return ENOMEM;
}
svc->mt_ctx = ctx;
talloc_set_destructor((TALLOC_CTX *)svc, svc_destructor);
svc->name = talloc_strdup(svc, name);
if (!svc->name) {
talloc_free(svc);
return ENOMEM;
}
svc->identity = talloc_strdup(svc, name);
if (!svc->identity) {
talloc_free(svc);
return ENOMEM;
}
path = talloc_asprintf(svc, CONFDB_SERVICE_PATH_TMPL, svc->name);
if (!path) {
talloc_free(svc);
return ENOMEM;
}
ret = confdb_get_string(ctx->cdb, svc, path,
CONFDB_SERVICE_COMMAND,
NULL, &svc->command);
if (ret != EOK) {
DEBUG(0,("Failed to start service '%s'\n", svc->name));
talloc_free(svc);
return ret;
}
if (!svc->command) {
svc->command = talloc_asprintf(svc, "%s/sssd_%s -d %d%s%s",
SSSD_LIBEXEC_PATH,
svc->name, debug_level,
(debug_timestamps?
"": " --debug-timestamps=0"),
(debug_to_file ?
" --debug-to-files":""));
if (!svc->command) {
talloc_free(svc);
return ENOMEM;
}
}
ret = confdb_get_int(ctx->cdb, svc, path,
CONFDB_SERVICE_TIMEOUT,
MONITOR_DEF_PING_TIME, &svc->ping_time);
if (ret != EOK) {
DEBUG(0,("Failed to start service '%s'\n", svc->name));
talloc_free(svc);
return ret;
}
/* 'timeout = 0' should be translated to the default */
if (svc->ping_time == 0) {
svc->ping_time = MONITOR_DEF_PING_TIME;
}
*svc_cfg = svc;
talloc_free(path);
return EOK;
}
static int add_new_service(struct mt_ctx *ctx, const char *name)
{
int ret;
struct mt_svc *svc;
ret = get_service_config(ctx, name, &svc);
if (ret != EOK) {
return ret;
}
ret = start_service(svc);
if (ret != EOK) {
DEBUG(0,("Failed to start service '%s'\n", svc->name));
talloc_free(svc);
}
return ret;
}
static int get_provider_config(struct mt_ctx *ctx, const char *name,
struct mt_svc **svc_cfg)
{
int ret;
char *path;
struct mt_svc *svc;
*svc_cfg = NULL;
svc = talloc_zero(ctx, struct mt_svc);
if (!svc) {
return ENOMEM;
}
svc->mt_ctx = ctx;
talloc_set_destructor((TALLOC_CTX *)svc, svc_destructor);
svc->name = talloc_strdup(svc, name);
if (!svc->name) {
talloc_free(svc);
return ENOMEM;
}
svc->identity = talloc_asprintf(svc, "%%BE_%s", svc->name);
if (!svc->identity) {
talloc_free(svc);
return ENOMEM;
}
path = talloc_asprintf(svc, CONFDB_DOMAIN_PATH_TMPL, name);
if (!path) {
talloc_free(svc);
return ENOMEM;
}
ret = confdb_get_string(ctx->cdb, svc, path,
CONFDB_DOMAIN_ID_PROVIDER,
NULL, &svc->provider);
if (ret != EOK) {
DEBUG(0, ("Failed to find ID provider from [%s] configuration\n", name));
talloc_free(svc);
return ret;
}
ret = confdb_get_string(ctx->cdb, svc, path,
CONFDB_DOMAIN_COMMAND,
NULL, &svc->command);
if (ret != EOK) {
DEBUG(0, ("Failed to find command from [%s] configuration\n", name));
talloc_free(svc);
return ret;
}
ret = confdb_get_int(ctx->cdb, svc, path,
CONFDB_DOMAIN_TIMEOUT,
MONITOR_DEF_PING_TIME, &svc->ping_time);
if (ret != EOK) {
DEBUG(0,("Failed to start service '%s'\n", svc->name));
talloc_free(svc);
return ret;
}
/* 'timeout = 0' should be translated to the default */
if (svc->ping_time == 0) {
svc->ping_time = MONITOR_DEF_PING_TIME;
}
talloc_free(path);
/* if no provider is present do not run the domain */
if (!svc->provider) {
talloc_free(svc);
return EIO;
}
/* if there are no custom commands, build a default one */
if (!svc->command) {
svc->command = talloc_asprintf(svc,
"%s/sssd_be -d %d%s%s --domain %s",
SSSD_LIBEXEC_PATH, debug_level,
(debug_timestamps?"": " --debug-timestamps=0"),
(debug_to_file?" --debug-to-files":""),
svc->name);
if (!svc->command) {
talloc_free(svc);
return ENOMEM;
}
}
*svc_cfg = svc;
return EOK;
}
static int add_new_provider(struct mt_ctx *ctx, const char *name)
{
int ret;
struct mt_svc *svc;
ret = get_provider_config(ctx, name, &svc);
if (ret != EOK) {
DEBUG(0, ("Could not get provider configuration for [%s]\n",
name));
return ret;
}
if (strcasecmp(svc->provider, "local") == 0) {
/* The LOCAL provider requires no back-end currently
* We'll add it to the service list, but we don't need
* to poll it.
*/
svc->svc_started = true;
DLIST_ADD(ctx->svc_list, svc);
return ENOENT;
}
ret = start_service(svc);
if (ret != EOK) {
DEBUG(0,("Failed to start service '%s'\n", svc->name));
talloc_free(svc);
}
return ret;
}
static void monitor_hup(struct tevent_context *ev,
struct tevent_signal *se,
int signum,
int count,
void *siginfo,
void *private_data)
{
struct mt_ctx *ctx = talloc_get_type(private_data, struct mt_ctx);
struct mt_svc *cur_svc;
DEBUG(1, ("Received SIGHUP.\n"));
/* Signal all services to rotate debug files */
for(cur_svc = ctx->svc_list; cur_svc; cur_svc = cur_svc->next) {
service_signal_rotate(cur_svc);
}
}
static int monitor_cleanup(void)
{
char *file;
int ret;
TALLOC_CTX *tmp_ctx;
tmp_ctx = talloc_new(NULL);
if (!tmp_ctx) return ENOMEM;
file = talloc_asprintf(tmp_ctx, "%s/%s.pid", PID_PATH, "sssd");
if (file == NULL) {
return ENOMEM;
}
errno = 0;
ret = unlink(file);
if (ret == -1) {
ret = errno;
DEBUG(0, ("Error removing pidfile! (%d [%s])\n",
ret, strerror(ret)));
talloc_free(file);
return errno;
}
talloc_free(file);
return EOK;
}
static void monitor_quit(struct tevent_context *ev,
struct tevent_signal *se,
int signum,
int count,
void *siginfo,
void *private_data)
{
struct mt_ctx *mt_ctx = talloc_get_type(private_data, struct mt_ctx);
struct mt_svc *svc;
pid_t pid;
int status;
errno_t error;
int kret;
bool killed;
DEBUG(8, ("Received shutdown command\n"));
DEBUG(0, ("Monitor received %s: terminating children\n",
strsignal(signum)));
/* Kill all of our known children manually */
DLIST_FOR_EACH(svc, mt_ctx->svc_list) {
if (svc->pid == 0) {
/* The local provider has no PID */
continue;
}
killed = false;
DEBUG(1, ("Terminating [%s][%d]\n", svc->name, svc->pid));
do {
errno = 0;
kret = kill(svc->pid, SIGTERM);
if (kret < 0) {
error = errno;
DEBUG(1, ("Couldn't kill [%s][%d]: [%s]\n",
svc->name, svc->pid, strerror(error)));
}
error = 0;
do {
errno = 0;
pid = waitpid(svc->pid, &status, WNOHANG);
if (pid == -1) {
/* An error occurred while waiting */
error = errno;
if (error != EINTR) {
DEBUG(0, ("[%d][%s] while waiting for [%s]\n",
error, strerror(error), svc->name));
/* Forcibly kill this child */
kill(svc->pid, SIGKILL);
break;
}
} else if (pid != 0) {
error = 0;
if WIFEXITED(status) {
DEBUG(1, ("Child [%s] exited gracefully\n", svc->name));
} else if WIFSIGNALED(status) {
DEBUG(1, ("Child [%s] terminated with a signal\n", svc->name));
} else {
DEBUG(0, ("Child [%s] did not exit cleanly\n", svc->name));
/* Forcibly kill this child */
kill(svc->pid, SIGKILL);
}
killed = true;
}
} while (error == EINTR);
if (!killed) {
/* Sleep 10ms and try again */
usleep(10000);
}
} while (!killed);
}
#if HAVE_GETPGRP
/* Kill any remaining children in our process group, just in case
* we have any leftover children we don't expect. For example, if
* a krb5_child or ldap_child is running at the same moment.
*/
error = 0;
if (getpgrp() == getpid()) {
kill(-getpgrp(), SIGTERM);
do {
errno = 0;
pid = waitpid(0, &status, 0);
if (pid == -1) {
error = errno;
}
} while (error == EINTR || pid > 0);
}
#endif
monitor_cleanup();
exit(0);
}
static void signal_offline(struct tevent_context *ev,
struct tevent_signal *se,
int signum,
int count,
void *siginfo,
void *private_data)
{
struct mt_ctx *monitor;
struct mt_svc *cur_svc;
monitor = talloc_get_type(private_data, struct mt_ctx);
DEBUG(8, ("Signaling providers to go offline immediately.\n"));
/* Signal all providers to immediately go offline */
for(cur_svc = monitor->svc_list; cur_svc; cur_svc = cur_svc->next) {
/* Don't signal services, only providers */
if (cur_svc->provider) {
service_signal_offline(cur_svc);
}
}
}
static void signal_offline_reset(struct tevent_context *ev,
struct tevent_signal *se,
int signum,
int count,
void *siginfo,
void *private_data)
{
struct mt_ctx *monitor;
struct mt_svc *cur_svc;
monitor = talloc_get_type(private_data, struct mt_ctx);
DEBUG(8, ("Signaling providers to reset offline immediately.\n"));
for(cur_svc = monitor->svc_list; cur_svc; cur_svc = cur_svc->next) {
if (cur_svc->provider) {
service_signal_reset_offline(cur_svc);
}
}
}
int read_config_file(const char *config_file)
{
int ret;
struct collection_item *sssd_config = NULL;
struct collection_item *error_list = NULL;
/* Read the configuration into a collection */
ret = config_from_file("sssd", config_file, &sssd_config,
INI_STOP_ON_ANY, &error_list);
if (ret != EOK) {
DEBUG(0, ("Parse error reading configuration file [%s]\n",
config_file));
print_file_parsing_errors(stderr, error_list);
}
free_ini_config_errors(error_list);
free_ini_config(sssd_config);
return ret;
}
static int monitor_ctx_destructor(void *mem)
{
struct mt_ctx *mon = talloc_get_type(mem, struct mt_ctx);
struct mt_svc *svc;
/* zero out references in svcs so that they don't try
* to access the monitor context on process shutdown */
for (svc = mon->svc_list; svc; svc = svc->next) {
svc->mt_ctx = NULL;
}
return 0;
}
static errno_t load_configuration(TALLOC_CTX *mem_ctx,
const char *config_file,
struct mt_ctx **monitor)
{
errno_t ret;
struct mt_ctx *ctx;
char *cdb_file = NULL;
ctx = talloc_zero(mem_ctx, struct mt_ctx);
if(!ctx) {
return ENOMEM;
}
talloc_set_destructor((TALLOC_CTX *)ctx, monitor_ctx_destructor);
cdb_file = talloc_asprintf(ctx, "%s/%s", DB_PATH, CONFDB_FILE);
if (cdb_file == NULL) {
DEBUG(0,("Out of memory, aborting!\n"));
ret = ENOMEM;
goto done;
}
ret = confdb_init(ctx, &ctx->cdb, cdb_file);
if (ret != EOK) {
DEBUG(0,("The confdb initialization failed\n"));
goto done;
}
/* Initialize the CDB from the configuration file */
ret = confdb_test(ctx->cdb);
if (ret == ENOENT) {
/* First-time setup */
/* Purge any existing confdb in case an old
* misconfiguration gets in the way
*/
talloc_zfree(ctx->cdb);
unlink(cdb_file);
ret = confdb_init(ctx, &ctx->cdb, cdb_file);
if (ret != EOK) {
DEBUG(0,("The confdb initialization failed\n"));
goto done;
}
/* Load special entries */
ret = confdb_create_base(ctx->cdb);
if (ret != EOK) {
DEBUG(0, ("Unable to load special entries into confdb\n"));
goto done;
}
} else if (ret != EOK) {
DEBUG(0, ("Fatal error initializing confdb\n"));
goto done;
}
talloc_zfree(cdb_file);
ret = confdb_init_db(config_file, ctx->cdb);
if (ret != EOK) {
DEBUG(0, ("ConfDB initialization has failed [%s]\n",
strerror(ret)));
goto done;
}
/* Validate the configuration in the database */
/* Read in the monitor's configuration */
ret = get_monitor_config(ctx);
if (ret != EOK) {
goto done;
}
*monitor = ctx;
ret = EOK;
done:
if (ret != EOK) {
talloc_free(ctx);
}
return ret;
}
#ifdef HAVE_SYS_INOTIFY_H
static void process_config_file(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval t, void *ptr);
static void config_file_changed(struct tevent_context *ev,
struct tevent_fd *fde,
uint16_t flags, void *data)
{
struct tevent_timer *te = NULL;
struct timeval tv;
struct config_file_ctx *file_ctx;
file_ctx = talloc_get_type(data, struct config_file_ctx);
if (file_ctx->needs_update) {
/* Skip updating. It's already queued for update.
*/
return;
}
/* We will queue the file for update in one second.
* This way, if there is a script writing to the file
* repeatedly, we won't be attempting to update multiple
* times.
*/
gettimeofday(&tv, NULL);
tv.tv_sec += 1;
te = tevent_add_timer(ev, ev, tv, process_config_file, file_ctx);
if (!te) {
DEBUG(0, ("Unable to queue config file update! Exiting.\n"));
kill(getpid(), SIGTERM);
return;
}
file_ctx->needs_update = 1;
}
struct rewatch_ctx {
struct config_file_callback *cb;
struct config_file_ctx *file_ctx;
};
static void rewatch_config_file(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval t, void *ptr);
static void process_config_file(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval t, void *ptr)
{
TALLOC_CTX *tmp_ctx;
struct inotify_event *in_event;
char *buf;
char *name;
ssize_t len, total_len;
ssize_t event_size;
struct config_file_ctx *file_ctx;
struct config_file_callback *cb;
struct rewatch_ctx *rw_ctx;
event_size = sizeof(struct inotify_event);
file_ctx = talloc_get_type(ptr, struct config_file_ctx);
DEBUG(1, ("Processing config file changes\n"));
tmp_ctx = talloc_new(NULL);
if (!tmp_ctx) return;
buf = talloc_size(tmp_ctx, event_size);
if (!buf) {
goto done;
}
total_len = 0;
while (total_len < event_size) {
len = read(file_ctx->mt_ctx->inotify_fd, buf+total_len,
event_size-total_len);
if (len == -1) {
if (errno == EINTR || errno == EAGAIN) continue;
DEBUG(0, ("Critical error reading inotify file descriptor.\n"));
goto done;
}
total_len += len;
}
in_event = (struct inotify_event *)buf;
if (in_event->len > 0) {
/* Read in the name, even though we don't use it,
* so that read ptr is in the right place
*/
name = talloc_size(tmp_ctx, len);
if (!name) {
goto done;
}
total_len = 0;
while (total_len < in_event->len) {
len = read(file_ctx->mt_ctx->inotify_fd, &name, in_event->len);
if (len == -1) {
if (errno == EINTR || errno == EAGAIN) continue;
DEBUG(0, ("Critical error reading inotify file descriptor.\n"));
goto done;
}
total_len += len;
}
}
for (cb = file_ctx->callbacks; cb; cb = cb->next) {
if (cb->wd == in_event->wd) {
break;
}
}
if (!cb) {
DEBUG(0, ("Unknown watch descriptor\n"));
goto done;
}
if (in_event->mask & IN_IGNORED) {
/* Some text editors will move a new file on top of the
* existing one instead of modifying it. In this case,
* the kernel will send us an IN_IGNORE signal.
* We will try to open a new watch descriptor on the
* new file.
*/
struct timeval tv;
struct tevent_timer *tev;
tv.tv_sec = t.tv_sec+5;
tv.tv_usec = t.tv_usec;
cb->retries = 0;
rw_ctx = talloc(file_ctx, struct rewatch_ctx);
if(!rw_ctx) {
DEBUG(0, ("Could not restore inotify watch. Quitting!\n"));
close(file_ctx->mt_ctx->inotify_fd);
kill(getpid(), SIGTERM);
goto done;
}
rw_ctx->cb = cb;
rw_ctx->file_ctx = file_ctx;
tev = tevent_add_timer(ev, rw_ctx, tv, rewatch_config_file, rw_ctx);
if (tev == NULL) {
DEBUG(0, ("Could not restore inotify watch. Quitting!\n"));
close(file_ctx->mt_ctx->inotify_fd);
kill(getpid(), SIGTERM);
}
goto done;
}
/* Tell the monitor to signal the children */
cb->fn(file_ctx, cb->filename);
file_ctx->needs_update = 0;
done:
talloc_free(tmp_ctx);
}
static void rewatch_config_file(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval t, void *ptr)
{
int err;
struct tevent_timer *tev = NULL;
struct timeval tv;
struct config_file_callback *cb;
struct rewatch_ctx *rw_ctx;
struct config_file_ctx *file_ctx;
rw_ctx = talloc_get_type(ptr, struct rewatch_ctx);
cb = rw_ctx->cb;
file_ctx = rw_ctx->file_ctx;
/* Retry six times at five-second intervals before giving up */
cb->retries++;
if (cb->retries > 6) {
DEBUG(0, ("Could not restore inotify watch. Quitting!\n"));
close(file_ctx->mt_ctx->inotify_fd);
kill(getpid(), SIGTERM);
}
cb->wd = inotify_add_watch(file_ctx->mt_ctx->inotify_fd,
cb->filename, IN_MODIFY);
if (cb->wd < 0) {
err = errno;
tv.tv_sec = t.tv_sec+5;
tv.tv_usec = t.tv_usec;
DEBUG(1, ("Could not add inotify watch for file [%s]. Error [%d:%s]\n",
cb->filename, err, strerror(err)));
tev = tevent_add_timer(ev, ev, tv, rewatch_config_file, rw_ctx);
if (tev == NULL) {
DEBUG(0, ("Could not restore inotify watch. Quitting!\n"));
close(file_ctx->mt_ctx->inotify_fd);
kill(getpid(), SIGTERM);
}
return;
}
cb->retries = 0;
/* Tell the monitor to signal the children */
cb->fn(file_ctx, cb->filename);
talloc_free(rw_ctx);
file_ctx->needs_update = 0;
}
#endif
static void poll_config_file(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval t, void *ptr)
{
int ret, err;
struct stat file_stat;
struct timeval tv;
struct config_file_ctx *file_ctx;
struct config_file_callback *cb;
file_ctx = talloc_get_type(ptr,struct config_file_ctx);
for (cb = file_ctx->callbacks; cb; cb = cb->next) {
ret = stat(cb->filename, &file_stat);
if (ret < 0) {
err = errno;
DEBUG(0, ("Could not stat file [%s]. Error [%d:%s]\n",
cb->filename, err, strerror(err)));
/* TODO: If the config file is missing, should we shut down? */
return;
}
if (file_stat.st_mtime != cb->modified) {
/* Parse the configuration file and signal the children */
/* Note: this will fire if the modification time changes into the past
* as well as the future.
*/
DEBUG(1, ("Config file changed\n"));
cb->modified = file_stat.st_mtime;
/* Tell the monitor to signal the children */
cb->fn(file_ctx, cb->filename);
}
}
gettimeofday(&tv, NULL);
tv.tv_sec += CONFIG_FILE_POLL_INTERVAL;
tv.tv_usec = 0;
file_ctx->timer = tevent_add_timer(ev, file_ctx->parent_ctx, tv,
poll_config_file, file_ctx);
if (!file_ctx->timer) {
DEBUG(0, ("Error: Config file no longer monitored for changes!\n"));
}
}
static int try_inotify(struct config_file_ctx *file_ctx, const char *filename,
monitor_reconf_fn fn)
{
#ifdef HAVE_SYS_INOTIFY_H
int err, fd_args, ret;
struct tevent_fd *tfd;
struct config_file_callback *cb;
/* Monitoring the file descriptor should be global */
if (!file_ctx->mt_ctx->inotify_fd) {
/* Set up inotify to monitor the config file for changes */
file_ctx->mt_ctx->inotify_fd = inotify_init();
if (file_ctx->mt_ctx->inotify_fd < 0) {
err = errno;
DEBUG(0, ("Could not initialize inotify, error [%d:%s]\n",
err, strerror(err)));
return err;
}
fd_args = fcntl(file_ctx->mt_ctx->inotify_fd, F_GETFL, NULL);
if (fd_args < 0) {
/* Could not set nonblocking */
close(file_ctx->mt_ctx->inotify_fd);
return EINVAL;
}
fd_args |= O_NONBLOCK;
ret = fcntl(file_ctx->mt_ctx->inotify_fd, F_SETFL, fd_args);
if (ret < 0) {
/* Could not set nonblocking */
close(file_ctx->mt_ctx->inotify_fd);
return EINVAL;
}
/* Add the inotify file descriptor to the TEvent context */
tfd = tevent_add_fd(file_ctx->mt_ctx->ev, file_ctx,
file_ctx->mt_ctx->inotify_fd,
TEVENT_FD_READ, config_file_changed,
file_ctx);
if (!tfd) {
close(file_ctx->mt_ctx->inotify_fd);
return EIO;
}
}
cb = talloc_zero(file_ctx, struct config_file_callback);
if(!cb) {
close(file_ctx->mt_ctx->inotify_fd);
return EIO;
}
cb->filename = talloc_strdup(cb, filename);
if (!cb->filename) {
close(file_ctx->mt_ctx->inotify_fd);
return ENOMEM;
}
cb->wd = inotify_add_watch(file_ctx->mt_ctx->inotify_fd,
cb->filename, IN_MODIFY);
if (cb->wd < 0) {
err = errno;
DEBUG(0, ("Could not add inotify watch for file [%s]. Error [%d:%s]\n",
cb->filename, err, strerror(err)));
close(file_ctx->mt_ctx->inotify_fd);
return err;
}
cb->fn = fn;
DLIST_ADD(file_ctx->callbacks, cb);
return EOK;
#else
return EINVAL;
#endif
}
static int monitor_config_file(TALLOC_CTX *mem_ctx,
struct mt_ctx *ctx,
const char *file,
monitor_reconf_fn fn)
{
int ret, err;
bool use_inotify;
struct timeval tv;
struct stat file_stat;
struct config_file_callback *cb = NULL;
ret = stat(file, &file_stat);
if (ret < 0) {
err = errno;
DEBUG(0, ("Could not stat file [%s]. Error [%d:%s]\n",
file, err, strerror(err)));
return err;
}
if (!ctx->file_ctx) {
ctx->file_ctx = talloc_zero(mem_ctx, struct config_file_ctx);
if (!ctx->file_ctx) return ENOMEM;
ctx->file_ctx->parent_ctx = mem_ctx;
ctx->file_ctx->mt_ctx = ctx;
}
ret = confdb_get_bool(ctx->cdb, ctx,
CONFDB_MONITOR_CONF_ENTRY,
CONFDB_MONITOR_TRY_INOTIFY,
true, &use_inotify);
if (ret != EOK) {
talloc_free(ctx->file_ctx);
return ret;
}
if (use_inotify) {
ret = try_inotify(ctx->file_ctx, file, fn);
if (ret != EOK) {
use_inotify = false;
}
}
if (!use_inotify) {
/* Could not monitor file with inotify, fall back to polling */
cb = talloc_zero(ctx->file_ctx, struct config_file_callback);
if (!cb) {
talloc_free(ctx->file_ctx);
return ENOMEM;
}
cb->filename = talloc_strdup(cb, file);
if (!cb->filename) {
talloc_free(ctx->file_ctx);
return ENOMEM;
}
cb->fn = fn;
cb->modified = file_stat.st_mtime;
DLIST_ADD(ctx->file_ctx->callbacks, cb);
if(!ctx->file_ctx->timer) {
gettimeofday(&tv, NULL);
tv.tv_sec += CONFIG_FILE_POLL_INTERVAL;
tv.tv_usec = 0;
ctx->file_ctx->timer = tevent_add_timer(ctx->ev, mem_ctx, tv,
poll_config_file, ctx->file_ctx);
if (!ctx->file_ctx->timer) {
talloc_free(ctx->file_ctx);
return EIO;
}
}
}
return EOK;
}
int monitor_process_init(struct mt_ctx *ctx,
const char *config_file)
{
TALLOC_CTX *tmp_ctx;
struct sysdb_ctx_list *db_list;
struct tevent_signal *tes;
struct sss_domain_info *dom;
int num_providers;
int ret;
/* Set up an event handler for a SIGHUP */
tes = tevent_add_signal(ctx->ev, ctx, SIGHUP, 0,
monitor_hup, ctx);
if (tes == NULL) {
return EIO;
}
/* Set up an event handler for a SIGINT */
BlockSignals(false, SIGINT);
tes = tevent_add_signal(ctx->ev, ctx, SIGINT, 0,
monitor_quit, ctx);
if (tes == NULL) {
return EIO;
}
/* Set up an event handler for a SIGTERM */
tes = tevent_add_signal(ctx->ev, ctx, SIGTERM, 0,
monitor_quit, ctx);
if (tes == NULL) {
return EIO;
}
/* Handle SIGUSR1 (tell all providers to go offline) */
BlockSignals(false, SIGUSR1);
tes = tevent_add_signal(ctx->ev, ctx, SIGUSR1, 0,
signal_offline, ctx);
if (tes == NULL) {
return EIO;
}
/* Handle SIGUSR2 (tell all providers to go reset offline) */
BlockSignals(false, SIGUSR2);
tes = tevent_add_signal(ctx->ev, ctx, SIGUSR2, 0,
signal_offline_reset, ctx);
if (tes == NULL) {
return EIO;
}
#if 0
This feature is incomplete and can leave the SSSD in a bad state if the
config file is changed while the SSSD is running.
Uncomment this once the backends are honoring reloadConfig()
/* Watch for changes to the confdb config file */
ret = monitor_config_file(ctx, ctx, config_file, monitor_signal_reconf);
if (ret != EOK) {
return ret;
}
#endif
/* Watch for changes to the DNS resolv.conf */
ret = monitor_config_file(ctx, ctx, RESOLV_CONF_PATH,
monitor_update_resolv);
if (ret != EOK) {
return ret;
}
/* Avoid a startup race condition between process.
* We need to handle DB upgrades or DB creation only
* in one process before all other start.
*/
tmp_ctx = talloc_new(NULL);
if (!tmp_ctx) {
return ENOMEM;
}
ret = sysdb_init(tmp_ctx, ctx->cdb, NULL, true, &db_list);
if (ret != EOK) {
return ret;
}
talloc_zfree(tmp_ctx);
/* 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;
}
ret = setup_netlink(ctx, ctx->ev, network_status_change_cb,
ctx, &ctx->nlctx);
if (ret != EOK) {
DEBUG(2, ("Cannot set up listening for network notifications\n"));
return ret;
}
/* start providers */
num_providers = 0;
for (dom = ctx->domains; dom; dom = dom->next) {
ret = add_new_provider(ctx, dom->name);
if (ret != EOK && ret != ENOENT) {
return ret;
}
if (ret != ENOENT) {
num_providers++;
}
}
if (num_providers > 0) {
/* now set the services stratup timeout *
* (responders will be started automatically when all
* providers are up and running or when the tomeout
* expires) */
ret = add_services_startup_timeout(ctx);
if (ret != EOK) {
return ret;
}
} else {
int i;
ctx->services_started = true;
/* No providers start services immediately
* Normally this means only LOCAL is configured */
for (i = 0; ctx->services[i]; i++) {
add_new_service(ctx, ctx->services[i]);
}
}
/* now start checking for global events */
set_global_checker(ctx);
return EOK;
}
static void init_timeout(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval t, void *ptr)
{
struct mon_init_conn *mini;
DEBUG(2, ("Client timed out before Identification!\n"));
mini = talloc_get_type(ptr, struct mon_init_conn);
sbus_disconnect(mini->conn);
talloc_zfree(mini);
}
/*
* monitor_service_init
* Set up a timeout function and temporary connection structure.
* If the client does not identify before the timeout kicks in,
* the client is forcibly disconnected.
*/
static int monitor_service_init(struct sbus_connection *conn, void *data)
{
struct mt_ctx *ctx;
struct mon_init_conn *mini;
struct timeval tv;
DEBUG(3, ("Initializing D-BUS Service\n"));
ctx = talloc_get_type(data, struct mt_ctx);
mini = talloc(conn, struct mon_init_conn);
if (!mini) {
DEBUG(0,("Out of memory?!\n"));
talloc_zfree(conn);
return ENOMEM;
}
mini->ctx = ctx;
mini->conn = conn;
/* 5 seconds should be plenty */
tv = tevent_timeval_current_ofs(10, 0);
mini->timeout = tevent_add_timer(ctx->ev, mini, tv, init_timeout, mini);
if (!mini->timeout) {
DEBUG(0,("Out of memory?!\n"));
talloc_zfree(conn);
return ENOMEM;
}
sbus_conn_set_private_data(conn, mini);
return EOK;
}
/* service_send_ping
* this function send a dbus ping to a service.
* It returns EOK if all is fine or ENXIO if the connection is
* not available (either not yet set up or teared down).
* Returns e generic error in other cases.
*/
static int service_send_ping(struct mt_svc *svc)
{
DBusMessage *msg;
int ret;
if (!svc->conn) {
DEBUG(8, ("Service not yet initialized\n"));
return ENXIO;
}
DEBUG(4,("Pinging %s\n", svc->name));
/*
* Set up identity request
* This should be a well-known path and method
* for all services
*/
msg = dbus_message_new_method_call(NULL,
MONITOR_PATH,
MONITOR_INTERFACE,
MON_CLI_METHOD_PING);
if (!msg) {
DEBUG(0,("Out of memory?!\n"));
talloc_zfree(svc->conn);
return ENOMEM;
}
ret = sbus_conn_send(svc->conn, msg,
svc->mt_ctx->service_id_timeout,
ping_check, svc, NULL);
dbus_message_unref(msg);
return ret;
}
static void ping_check(DBusPendingCall *pending, void *data)
{
struct mt_svc *svc;
DBusMessage *reply;
const char *dbus_error_name;
int type;
svc = talloc_get_type(data, struct mt_svc);
reply = dbus_pending_call_steal_reply(pending);
if (!reply) {
/* reply should never be null. This function shouldn't be called
* until reply is valid or timeout has occurred. If reply is NULL
* here, something is seriously wrong and we should bail out.
*/
DEBUG(0, ("A reply callback was called but no reply was received"
" and no timeout occurred\n"));
/* Destroy this connection */
sbus_disconnect(svc->conn);
goto done;
}
type = dbus_message_get_type(reply);
switch (type) {
case DBUS_MESSAGE_TYPE_METHOD_RETURN:
/* ok peer replied,
* make sure we reset the failure counter in the service structure */
DEBUG(4,("Service %s replied to ping\n", svc->name));
svc->failed_pongs = 0;
break;
case DBUS_MESSAGE_TYPE_ERROR:
dbus_error_name = dbus_message_get_error_name(reply);
/* timeouts are handled in the main service check function */
if (strcmp(dbus_error_name, DBUS_ERROR_TIMEOUT) == 0)
break;
DEBUG(0,("A service PING returned an error [%s], closing connection.\n",
dbus_error_name));
/* Falling through to default intentionally*/
default:
/*
* Timeout or other error occurred or something
* unexpected happened.
* It doesn't matter which, because either way we
* know that this connection isn't trustworthy.
* We'll destroy it now.
*/
sbus_disconnect(svc->conn);
}
done:
dbus_pending_call_unref(pending);
dbus_message_unref(reply);
}
/* service_check_alive
* This function checks if the service child is still alive
*/
static int service_check_alive(struct mt_svc *svc)
{
int status;
pid_t pid;
DEBUG(4,("Checking service %s(%d) is still alive\n", svc->name, svc->pid));
pid = waitpid(svc->pid, &status, WNOHANG);
if (pid == 0) {
return EOK;
}
if (pid != svc->pid) {
DEBUG(1, ("bad return (%d) from waitpid() waiting for %d\n",
pid, svc->pid));
/* TODO: what do we do now ? */
return EINVAL;
}
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\n", svc->name));
}
return ECHILD;
}
static void service_startup_handler(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval t, void *ptr);
static int start_service(struct mt_svc *svc)
{
struct tevent_timer *te;
struct timeval tv;
DEBUG(4,("Queueing service %s for startup\n", svc->name));
/* at startup we need to start the data providers before the responders
* to avoid races where a service starts before sbus pipes are ready
* to accept connections. So if startup is true delay by 2 seconds any
* process that is not a data provider */
tv = tevent_timeval_current();
/* Add a timed event to start up the service.
* We have to do this in order to avoid a race
* condition where the service being started forks
* and attempts to connect to the SBUS before
* the monitor is serving it.
*/
te = tevent_add_timer(svc->mt_ctx->ev, svc, tv,
service_startup_handler, svc);
if (te == NULL) {
DEBUG(0, ("Unable to queue service %s for startup\n", svc->name));
return ENOMEM;
}
return EOK;
}
static void service_startup_handler(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval t, void *ptr)
{
struct mt_svc *mt_svc;
char **args;
mt_svc = talloc_get_type(ptr, struct mt_svc);
if (mt_svc == NULL) {
return;
}
mt_svc->pid = fork();
if (mt_svc->pid != 0) {
if (mt_svc->pid == -1) {
DEBUG(0, ("Could not fork child to start service [%s]. Continuing.\n", mt_svc->name))
return;
}
/* Parent */
mt_svc->mt_ctx->check_children = true;
mt_svc->failed_pongs = 0;
DLIST_ADD(mt_svc->mt_ctx->svc_list, mt_svc);
set_tasks_checker(mt_svc);
return;
}
/* child */
args = parse_args(mt_svc->command);
execvp(args[0], args);
/* If we are here, exec() has failed
* Print errno and abort quickly */
DEBUG(0,("Could not exec %s, reason: %s\n", mt_svc->command, strerror(errno)));
/* We have to call _exit() instead of exit() here
* because a bug in D-BUS will cause the server to
* close its socket at exit() */
_exit(1);
}
int main(int argc, const char *argv[])
{
int opt;
poptContext pc;
int opt_daemon = 0;
int opt_interactive = 0;
char *opt_config_file = NULL;
char *config_file = NULL;
int flags = 0;
struct main_context *main_ctx;
TALLOC_CTX *tmp_ctx;
struct mt_ctx *monitor;
int ret;
uid_t uid;
struct poptOption long_options[] = {
POPT_AUTOHELP
SSSD_MAIN_OPTS
{"daemon", 'D', POPT_ARG_NONE, &opt_daemon, 0, \
_("Become a daemon (default)"), NULL }, \
{"interactive", 'i', POPT_ARG_NONE, &opt_interactive, 0, \
_("Run interactive (not a daemon)"), NULL}, \
{"config", 'c', POPT_ARG_STRING, &opt_config_file, 0, \
_("Specify a non-default config file"), NULL}, \
POPT_TABLEEND
};
pc = poptGetContext(argv[0], argc, argv, long_options, 0);
while((opt = poptGetNextOpt(pc)) != -1) {
switch(opt) {
default:
fprintf(stderr, "\nInvalid option %s: %s\n\n",
poptBadOption(pc, 0), poptStrerror(opt));
poptPrintUsage(pc, stderr, 0);
return 1;
}
}
if (opt_daemon && opt_interactive) {
fprintf(stderr, "Option -i|--interactive is not allowed together with -D|--daemon\n");
poptPrintUsage(pc, stderr, 0);
return 1;
}
if (!opt_daemon && !opt_interactive) {
opt_daemon = 1;
}
poptFreeContext(pc);
uid = getuid();
if (uid != 0) {
DEBUG(1, ("Running under %d, must be root\n", uid));
sss_log(SSS_LOG_ALERT, "sssd must be run as root");
return 8;
}
tmp_ctx = talloc_new(NULL);
if (!tmp_ctx) {
return 7;
}
if (opt_daemon) flags |= FLAGS_DAEMON;
if (opt_interactive) flags |= FLAGS_INTERACTIVE;
if (opt_config_file)
config_file = talloc_strdup(tmp_ctx, opt_config_file);
else
config_file = talloc_strdup(tmp_ctx, CONFDB_DEFAULT_CONFIG_FILE);
if(!config_file)
return 6;
/* we want a pid file check */
flags |= FLAGS_PID_FILE;
/* Open before server_setup() does to have logging
* during configuration checking */
if (debug_to_file) {
ret = open_debug_file();
if (ret) {
return 7;
}
}
/* Warn if nscd seems to be running */
ret = check_file(NSCD_SOCKET_PATH, -1, -1, -1, CHECK_SOCK, NULL);
if (ret == EOK) {
sss_log(SSS_LOG_NOTICE,
"nscd socket was detected. Nscd caching capabilities "
"may conflict with SSSD for users and groups. It is "
"recommended not to run nscd in parallel with SSSD, unless "
"nscd is configured not to cache the passwd, group and "
"netgroup nsswitch maps.");
}
/* Parse config file, fail if cannot be done */
ret = load_configuration(tmp_ctx, config_file, &monitor);
if (ret != EOK) {
if (ret == EPERM) {
DEBUG(1, ("Cannot read configuration file %s\n", config_file));
sss_log(SSS_LOG_ALERT,
"Cannot read config file %s, please check if permissions "
"are 0600 and the file is owned by root.root", config_file);
} else {
DEBUG(1, ("Error loading configuration database: [%d]: %s",
ret, strerror(ret)));
sss_log(SSS_LOG_ALERT, "Cannot load configuration database");
}
return 4;
}
/* set up things like debug , signals, daemonization, etc... */
ret = server_setup("sssd", flags, CONFDB_MONITOR_CONF_ENTRY, &main_ctx);
if (ret != EOK) return 2;
monitor->ev = main_ctx->event_ctx;
talloc_steal(main_ctx, monitor);
ret = monitor_process_init(monitor,
config_file);
if (ret != EOK) return 3;
talloc_free(tmp_ctx);
/* loop on main */
server_loop(main_ctx);
ret = monitor_cleanup();
if (ret != EOK) return 5;
return 0;
}