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/*
* 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 2 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, 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>
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdint.h>
#include <stdlib.h>
#include <syslog.h>
#include <ctype.h>
#include <errno.h>
#include <dirent.h>
#include <fcntl.h>
#include <math.h>
#include <time.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <linux/types.h>
#include <linux/watchdog.h>
#include "ucix.h"
#include "wireless.22.h"
/* Check interval */
#define INTERVAL 30
/* Hysteresis */
#define HYSTERESIS 3
/* How to call myself in the logs */
#define SYSLOG_IDENT "Freifunk Watchdog"
/* Wifi error action */
#define WIFI_ACTION "/sbin/wifi", "/sbin/wifi"
/* Crond error action */
#define CRON_ACTION "/etc/init.d/cron", "/etc/init.d/cron", "restart"
/* SSHd error action */
#define SSHD_ACTION "/etc/init.d/dropbear", "/etc/init.d/dropbear", "restart"
/* Watchdog device */
#define WATCH_DEVICE "/dev/watchdog"
#define WATCH_SHUTDOWN 'V'
#define WATCH_KEEPALIVE '\0'
/* System load error action and treshold */
#define LOAD_TRESHOLD 5.00
#define LOAD_ACTION "/sbin/reboot"
/* Fallback binary name (passed by makefile) */
#ifndef BINARY
#define BINARY "ffwatchd"
#endif
/* ifname/bssid/channel tuples */
struct wifi_tuple {
char ifname[16];
char bssid[18];
int channel;
struct wifi_tuple *next;
};
/* structure to hold tuple-list and uci context during iteration */
struct uci_itr_ctx {
struct wifi_tuple *list;
struct uci_context *ctx;
};
typedef struct wifi_tuple wifi_tuple_t;
/* ioctl() helper (stolen from iwlib) */
static inline int
iw_ioctl(int skfd, /* Socket to the kernel */
const char * ifname, /* Device name */
int request, /* WE ID */
struct iwreq * pwrq) /* Fixed part of the request */
{
/* Set device name */
strncpy(pwrq->ifr_ifrn.ifrn_name, ifname, 16);
/* Do the request */
return(ioctl(skfd, request, pwrq));
}
/* fork() & execl() helper */
#define EXEC(x) \
do { \
switch(fork()) \
{ \
case -1: \
syslog(LOG_CRIT, "Unable to fork child: %s", \
strerror(errno)); \
\
break; \
\
case 0: \
execl(x, NULL); \
syslog(LOG_CRIT, "Unable to execute action: %s", \
strerror(errno)); \
\
return 1; \
} \
} while(0)
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