#include "watchdog.h"
+/* Global watchdog fd, required by signal handler */
+int wdfd = -1;
+
+/* Watchdog shutdown helper */
+static void shutdown_watchdog(int sig)
+{
+ static int wdelay = 3600;
+ 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)
{
*mtime = s.st_mtime;
return 1;
}
-
- return 0;
}
- return -1;
+ return 0;
}
/* Add tuple */
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);
+ 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++;
+ }
+ }
- t->next = itr->list;
- itr->list = t;
- }
- else
- {
- free(t);
+ 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);
+ }
}
}
}
/* 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 wdfd;
- int wdtrigger = 1;
int channel;
char bssid[18];
+ struct sigaction sa;
wifi_tuple_t *ifs = NULL, *curif;
time_t modtime = 0;
+ int action_intv = 0;
int restart_wifi = 0;
int restart_cron = 0;
int restart_sshd = 0;
if( (wdfd = open(WATCH_DEVICE, O_WRONLY)) > -1 )
{
- syslog(LOG_INFO, "Opened %s - polling each %i seconds",
- WATCH_DEVICE, INTERVAL);
+ 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);
}
while( 1 )
{
- /* Check average load */
- if( find_loadavg() >= LOAD_TRESHOLD )
- loadavg_panic++;
- else
- loadavg_panic = 0;
-
- /* Check crond */
- if( find_process("crond") < 0 )
- restart_cron++;
-
- /* Check SSHd */
- if( find_process("dropbear") < 0 )
- restart_sshd++;
-
- /* Check wireless interfaces */
- ifs = load_wifi_uci(ifs, &modtime);
- for( curif = ifs; curif; curif = curif->next )
+ /* Check/increment action interval */
+ if( ++action_intv >= ACTION_INTERVAL )
{
- /* Get current channel and bssid */
- if( (iw_get_bssid(iwfd, curif->ifname, bssid) == 0) &&
- (iw_get_channel(iwfd, curif->ifname, &channel) == 0) )
+ /* Reset action interval */
+ action_intv = 0;
+
+ /* Check average load */
+ if( find_loadavg() >= LOAD_TRESHOLD )
+ loadavg_panic++;
+ else
+ loadavg_panic = 0;
+
+ /* Check crond */
+ if( find_process("crond") < 0 )
+ restart_cron++;
+ else
+ restart_cron = 0;
+
+ /* Check SSHd */
+ if( find_process("dropbear") < 0 )
+ restart_sshd++;
+ else
+ restart_sshd = 0;
+
+ /* Check wireless interfaces */
+ ifs = load_wifi_uci(ifs, &modtime);
+ for( curif = ifs; curif; curif = curif->next )
{
- /* Check BSSID */
- if( strcasecmp(bssid, curif->bssid) != 0 )
+ /* Get current channel and bssid */
+ if( (iw_get_bssid(iwfd, curif->ifname, bssid) == 0) &&
+ (iw_get_channel(iwfd, curif->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, curif->bssid) != 0 )
+ {
+ syslog(LOG_WARNING, "BSSID mismatch on %s: current=%s wanted=%s",
+ curif->ifname, bssid, curif->bssid);
+
+ restart_wifi++;
+ }
+
+ /* Check channel */
+ else if( channel != curif->channel )
+ {
+ syslog(LOG_WARNING, "Channel mismatch on %s: current=%d wanted=%d",
+ curif->ifname, channel, curif->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);
-
- restart_wifi++;
+ syslog(LOG_WARNING, "Requested interface %s not present", curif->ifname);
}
}
- 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);
}
- }
+ /* Cron restart required? */
+ if( restart_cron >= HYSTERESIS )
+ {
+ restart_cron = 0;
+ syslog(LOG_WARNING, "The cron process died, restarting");
+ EXEC(CRON_ACTION);
+ }
- /* Wifi restart required? */
- if( restart_wifi >= HYSTERESIS )
- {
- restart_wifi = 0;
- syslog(LOG_WARNING, "Channel or BSSID mismatch on wireless interface, restarting");
- EXEC(WIFI_ACTION);
- }
+ /* SSHd restart required? */
+ if( restart_sshd >= HYSTERESIS )
+ {
+ restart_sshd = 0;
+ syslog(LOG_WARNING, "The ssh process died, restarting");
+ EXEC(SSHD_ACTION);
+ }
- /* Cron restart required? */
- if( restart_cron >= HYSTERESIS )
- {
- restart_cron = 0;
- syslog(LOG_WARNING, "The cron process died, restarting");
- EXEC(CRON_ACTION);
- }
+ /* Is there a load problem? */
+ if( loadavg_panic >= HYSTERESIS )
+ {
+ syslog(LOG_EMERG, "Critical system load level, triggering reset!");
- /* SSHd restart required? */
- if( restart_sshd >= HYSTERESIS )
- {
- restart_sshd = 0;
- syslog(LOG_WARNING, "The ssh process died, restarting");
- EXEC(SSHD_ACTION);
+ /* Try watchdog, fall back to reboot */
+ if( wdfd > -1 )
+ ioctl(wdfd, WDIOC_SETTIMEOUT, &wdtrigger);
+ else
+ EXEC(LOAD_ACTION);
+ }
}
- /* Is there a load problem? */
- if( loadavg_panic >= HYSTERESIS )
- {
- syslog(LOG_EMERG, "Critical system load level, triggering reset!");
-
- /* Try watchdog, fall back to reboot */
- if( wdfd > -1 )
- ioctl(wdfd, WDIOC_SETTIMEOUT, &wdtrigger);
- else
- EXEC(LOAD_ACTION);
- }
/* Reset watchdog timer */
if( wdfd > -1 )
- write(wdfd, '\0', 1);
+ write(wdfd, &wdkeepalive, 1);
- sleep(INTERVAL);
- }
-
- if( wdfd > -1 )
- {
- syslog(LOG_INFO, "Stopping watchdog timer");
- write(wdfd, WATCH_SHUTDOWN, 1);
- close(wdfd);
+ sleep(BASE_INTERVAL);
}
+ shutdown_watchdog(0);
closelog();
+
return 0;
}
projects / project / luci.git / blobdiff