* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
- * Copyright (C) 2009 Jo-Philipp Wich <xm@subsignal.org>
+ * Copyright (C) 2009 Jo-Philipp Wich <jow@openwrt.org>
*/
#include "watchdog.h"
+/* Global watchdog fd, required by signal handler */
+int wdfd = -1;
+
+/* Handle finished children */
+static void sigchld_handler(int sig)
+{
+ pid_t pid;
+
+ while( (pid = waitpid(-1, NULL, WNOHANG)) > 0 )
+ syslog(LOG_INFO, "Child returned (pid %d)", pid);
+}
+
+/* Watchdog shutdown helper */
+static void shutdown_watchdog(int sig)
+{
+ static const char wshutdown = WATCH_SHUTDOWN;
+
+ if( wdfd > -1 )
+ {
+ syslog(LOG_INFO, "Stopping watchdog timer");
+ write(wdfd, &wshutdown, 1);
+ close(wdfd);
+ wdfd = -1;
+ }
+
+ exit(0);
+}
+
/* Get BSSID of given interface */
static int iw_get_bssid(int iwfd, const char *ifname, char *bssid)
{
return -1;
}
+/* Get the 5 minute load average */
+static double find_loadavg(void)
+{
+ int fd;
+ char buffer[10];
+ double load = 0.00;
+
+ if( (fd = open("/proc/loadavg", O_RDONLY)) > -1 )
+ {
+ if( read(fd, buffer, sizeof(buffer)) == sizeof(buffer) )
+ load = atof(&buffer[5]);
+
+ close(fd);
+ }
+
+ return load;
+}
+
/* Check if given uci file was updated */
static int check_uci_update(const char *config, time_t *mtime)
{
struct stat s;
char path[128];
- snprintf(path, sizeof(path), "/etc/config/%s", config);
+ snprintf(path, sizeof(path), "/var/state/%s", config);
if( stat(path, &s) > -1 )
{
if( (*mtime == 0) || (s.st_mtime > *mtime) )
*mtime = s.st_mtime;
return 1;
}
- else
- {
- snprintf(path, sizeof(path), "/var/state/%s", config);
- if( stat(path, &s) > -1 )
- {
- if( (*mtime == 0) || (s.st_mtime > *mtime) )
- {
- *mtime = s.st_mtime;
- return 1;
- }
- }
-
- return 0;
- }
}
- return -1;
+ return 0;
}
/* Add tuple */
-static void load_wifi_uci_add_iface(const char *section, struct uci_itr_ctx *itr)
+static void load_wifi_uci_add_iface(const char *section, struct uci_wifi_iface_itr_ctx *itr)
{
wifi_tuple_t *t;
const char *ucitmp;
int val = 0;
- if( (t = (wifi_tuple_t *)malloc(sizeof(wifi_tuple_t))) != NULL )
+ ucitmp = ucix_get_option(itr->ctx, "wireless", section, "mode");
+ if( ucitmp && !strncmp(ucitmp, "adhoc", 5) )
{
- ucitmp = ucix_get_option(itr->ctx, "wireless", section, "ifname");
- if(ucitmp)
+ if( (t = (wifi_tuple_t *)malloc(sizeof(wifi_tuple_t))) != NULL )
{
- strncpy(t->ifname, ucitmp, sizeof(t->ifname));
- val++;
- }
-
- ucitmp = ucix_get_option(itr->ctx, "wireless", section, "bssid");
- if(ucitmp)
- {
- strncpy(t->bssid, ucitmp, sizeof(t->bssid));
- val++;
- }
+ ucitmp = ucix_get_option(itr->ctx, "wireless", section, "ifname");
+ if(ucitmp)
+ {
+ strncpy(t->ifname, ucitmp, sizeof(t->ifname));
+ val++;
+ }
- ucitmp = ucix_get_option(itr->ctx, "wireless", section, "device");
- if(ucitmp)
- {
- ucitmp = ucix_get_option(itr->ctx, "wireless", ucitmp, "channel");
+ ucitmp = ucix_get_option(itr->ctx, "wireless", section, "bssid");
if(ucitmp)
{
- t->channel = atoi(ucitmp);
+ strncpy(t->bssid, ucitmp, sizeof(t->bssid));
val++;
}
- }
-
- if( val == 3 )
- {
- syslog(LOG_INFO, "Monitoring %s: bssid=%s channel=%d",
- t->ifname, t->bssid, t->channel);
- t->next = itr->list;
- itr->list = t;
- }
- else
- {
- free(t);
+ ucitmp = ucix_get_option(itr->ctx, "wireless", section, "device");
+ if(ucitmp)
+ {
+ ucitmp = ucix_get_option(itr->ctx, "wireless", ucitmp, "channel");
+ if(ucitmp)
+ {
+ t->channel = atoi(ucitmp);
+ val++;
+ }
+ }
+
+ if( val == 3 )
+ {
+ syslog(LOG_INFO, "Monitoring %s: bssid=%s channel=%d",
+ t->ifname, t->bssid, t->channel);
+
+ t->next = itr->list;
+ itr->list = t;
+ }
+ else
+ {
+ free(t);
+ }
}
}
}
static wifi_tuple_t * load_wifi_uci(wifi_tuple_t *ifs, time_t *modtime)
{
struct uci_context *ctx;
- struct uci_itr_ctx itr;
+ struct uci_wifi_iface_itr_ctx itr;
wifi_tuple_t *cur, *next;
if( check_uci_update("wireless", modtime) )
{
- syslog(LOG_INFO, "Config changed, reloading");
+ syslog(LOG_INFO, "Wireless config changed, reloading");
if( (ctx = ucix_init("wireless")) != NULL )
{
return ifs;
}
+/* Add tuple */
+static void load_watchdog_uci_add_process(const char *section, struct uci_process_itr_ctx *itr)
+{
+ process_tuple_t *t;
+ const char *ucitmp;
+ int val = 0;
+
+ if( (t = (process_tuple_t *)malloc(sizeof(process_tuple_t))) != NULL )
+ {
+ t->restart = 0;
+
+ ucitmp = ucix_get_option(itr->ctx, "freifunk-watchdog", section, "process");
+ if(ucitmp)
+ {
+ strncpy(t->process, ucitmp, sizeof(t->process));
+ val++;
+ }
+
+ ucitmp = ucix_get_option(itr->ctx, "freifunk-watchdog", section, "initscript");
+ if(ucitmp)
+ {
+ strncpy(t->initscript, ucitmp, sizeof(t->initscript));
+ val++;
+ }
+
+ if( val == 2 )
+ {
+ syslog(LOG_INFO, "Monitoring %s: initscript=%s",
+ t->process, t->initscript);
+
+ t->next = itr->list;
+ itr->list = t;
+ }
+ else
+ {
+ free(t);
+ }
+ }
+}
+
+/* Load config */
+static process_tuple_t * load_watchdog_uci(process_tuple_t *procs)
+{
+ struct uci_context *ctx;
+ struct uci_process_itr_ctx itr;
+ process_tuple_t *cur, *next;
+
+ syslog(LOG_INFO, "Loading watchdog config");
+
+ if( (ctx = ucix_init("freifunk-watchdog")) != NULL )
+ {
+ if( procs != NULL )
+ {
+ for(cur = procs; cur; cur = next)
+ {
+ next = cur->next;
+ free(cur);
+ }
+ }
+
+ itr.list = NULL;
+ itr.ctx = ctx;
+
+ ucix_for_each_section_type(ctx, "freifunk-watchdog", "process",
+ (void *)load_watchdog_uci_add_process, &itr);
+
+ return itr.list;
+ }
+
+ return procs;
+}
+
/* Daemon implementation */
static int do_daemon(void)
{
+ static int wdtrigger = 1;
+ static int wdtimeout = BASE_INTERVAL * 2;
+ static const char wdkeepalive = WATCH_KEEPALIVE;
+
int iwfd;
int channel;
char bssid[18];
+ struct sigaction sa;
- wifi_tuple_t *ifs = NULL, *curif;
- time_t modtime = 0;
+ wifi_tuple_t *ifs = NULL, *curr_if;
+ process_tuple_t *procs = NULL, *curr_proc;
+ time_t wireless_modtime = 0;
+ int action_intv = 0;
int restart_wifi = 0;
- int restart_cron = 0;
+ int loadavg_panic = 0;
openlog(SYSLOG_IDENT, 0, LOG_DAEMON);
- //daemon(1, 1);
+ memset(&sa, 0, sizeof(sa));
if( (iwfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1 )
{
- perror("Can not open wireless control socket");
+ syslog(LOG_ERR, "Can not open wireless control socket: %s",
+ strerror(errno));
+
return 1;
}
+ if( (wdfd = open(WATCH_DEVICE, O_WRONLY)) > -1 )
+ {
+ syslog(LOG_INFO, "Opened %s - polling every %i seconds",
+ WATCH_DEVICE, BASE_INTERVAL);
+
+ /* Install signal handler to halt watchdog on shutdown */
+ sa.sa_handler = shutdown_watchdog;
+ sa.sa_flags = SA_NOCLDWAIT | SA_RESTART;
+ sigaction(SIGHUP, &sa, NULL);
+ sigaction(SIGINT, &sa, NULL);
+ sigaction(SIGPIPE, &sa, NULL);
+ sigaction(SIGTERM, &sa, NULL);
+ sigaction(SIGUSR1, &sa, NULL);
+ sigaction(SIGUSR2, &sa, NULL);
+
+ /* Set watchdog timeout to twice the interval */
+ ioctl(wdfd, WDIOC_SETTIMEOUT, &wdtimeout);
+ }
+
+ /* Install signal handler to reap children */
+ sa.sa_handler = sigchld_handler;
+ sa.sa_flags = 0;
+ sigaction(SIGCHLD, &sa, NULL);
+
+ /* Load watchdog configuration only once */
+ procs = load_watchdog_uci(procs);
+
while( 1 )
{
- if( (ifs = load_wifi_uci(ifs, &modtime)) == NULL )
+ /* Check/increment action interval */
+ if( ++action_intv >= ACTION_INTERVAL )
{
- printf("Can not load wireless uci. File corrupt?\n");
- return 1;
- }
+ /* Reset action interval */
+ action_intv = 0;
- /* Check crond */
- if( find_process("crond") < 0 )
- {
- syslog(LOG_WARNING, "The crond process died, restarting");
- restart_cron++;
- }
+ /* Check average load */
+ if( find_loadavg() >= LOAD_TRESHOLD )
+ loadavg_panic++;
+ else
+ loadavg_panic = 0;
- /* Check wireless interfaces */
- for( curif = ifs; curif; curif = curif->next )
- {
- /* Get current channel and bssid */
- if( (iw_get_bssid(iwfd, curif->ifname, bssid) == 0) &&
- (iw_get_channel(iwfd, curif->ifname, &channel) == 0) )
+ /* Check wireless interfaces */
+ ifs = load_wifi_uci(ifs, &wireless_modtime);
+ for( curr_if = ifs; curr_if; curr_if = curr_if->next )
{
- /* Check BSSID */
- if( strcasecmp(bssid, curif->bssid) != 0 )
+ /* Get current channel and bssid */
+ if( (iw_get_bssid(iwfd, curr_if->ifname, bssid) == 0) &&
+ (iw_get_channel(iwfd, curr_if->ifname, &channel) == 0) )
{
- syslog(LOG_WARNING, "BSSID mismatch on %s: current=%s wanted=%s",
- curif->ifname, bssid, curif->bssid);
-
- restart_wifi++;
+ /* Check BSSID */
+ if( strcasecmp(bssid, curr_if->bssid) != 0 )
+ {
+ syslog(LOG_WARNING, "BSSID mismatch on %s: current=%s wanted=%s",
+ curr_if->ifname, bssid, curr_if->bssid);
+
+ restart_wifi++;
+ }
+
+ /* Check channel */
+ else if( channel != curr_if->channel )
+ {
+ syslog(LOG_WARNING, "Channel mismatch on %s: current=%d wanted=%d",
+ curr_if->ifname, channel, curr_if->channel);
+
+ restart_wifi++;
+ }
}
-
- /* Check channel */
- else if( channel != curif->channel )
+ else
{
- syslog(LOG_WARNING, "Channel mismatch on %s: current=%d wanted=%d",
- curif->ifname, channel, curif->channel);
+ syslog(LOG_WARNING, "Requested interface %s not present", curr_if->ifname);
+ }
+ }
+
+ /* Check processes */
+ for( curr_proc = procs; curr_proc; curr_proc = curr_proc->next )
+ {
+ if( find_process(curr_proc->process) < 0 )
+ curr_proc->restart++;
+ else
+ curr_proc->restart = 0;
- restart_wifi++;
+ /* Process restart required? */
+ if( curr_proc->restart >= HYSTERESIS )
+ {
+ curr_proc->restart = 0;
+ syslog(LOG_WARNING, "The %s process died, restarting", curr_proc->process);
+ EXEC(PROC_ACTION);
}
}
- else
+
+
+ /* Wifi restart required? */
+ if( restart_wifi >= HYSTERESIS )
{
- syslog(LOG_WARNING, "Requested interface %s not present", curif->ifname);
+ restart_wifi = 0;
+ syslog(LOG_WARNING, "Channel or BSSID mismatch on wireless interface, restarting");
+ EXEC(WIFI_ACTION);
}
- }
+ /* Is there a load problem? */
+ if( loadavg_panic >= HYSTERESIS )
+ {
+ syslog(LOG_EMERG, "Critical system load level, triggering reset!");
- /* Wifi restart required? */
- if( restart_wifi >= HYSTERESIS )
- {
- restart_wifi = 0;
- syslog(LOG_WARNING, "Restarting wireless");
- EXEC(WIFI_ACTION);
+ /* Try watchdog, fall back to reboot */
+ if( wdfd > -1 )
+ ioctl(wdfd, WDIOC_SETTIMEOUT, &wdtrigger);
+ else
+ EXEC(LOAD_ACTION);
+ }
}
- /* Cron restart required? */
- if( restart_cron >= HYSTERESIS )
- {
- restart_cron = 0;
- syslog(LOG_WARNING, "Restarting crond process");
- EXEC(CRON_ACTION);
- }
- sleep(INTERVAL);
+ /* Reset watchdog timer */
+ if( wdfd > -1 )
+ write(wdfd, &wdkeepalive, 1);
+
+ sleep(BASE_INTERVAL);
}
+ shutdown_watchdog(0);
closelog();
+
return 0;
}
projects / oweals / luci.git / blobdiff