| 1 | /* |
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| 2 | * This program is free software; you can redistribute it and/or modify |
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| 3 | * it under the terms of the GNU General Public License as published by |
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| 4 | * the Free Software Foundation; either version 2 of the License, or |
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| 5 | * (at your option) any later version. |
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| 6 | * |
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| 7 | * This program is distributed in the hope that it will be useful, |
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| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 10 | * GNU General Public License for more details. |
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| 11 | * |
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| 12 | * You should have received a copy of the GNU General Public License |
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| 13 | * along with this program; if not, write to the Free Software |
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| 14 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. |
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| 15 | * |
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| 16 | * Copyright (C) 2009 Jo-Philipp Wich <xm@subsignal.org> |
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| 17 | */ |
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| 18 | |
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| 19 | #include <stdio.h> |
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| 20 | #include <string.h> |
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| 21 | #include <unistd.h> |
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| 22 | #include <stdint.h> |
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| 23 | #include <stdlib.h> |
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| 24 | #include <syslog.h> |
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| 25 | #include <ctype.h> |
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| 26 | #include <errno.h> |
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| 27 | #include <dirent.h> |
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| 28 | #include <fcntl.h> |
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| 29 | #include <math.h> |
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| 30 | #include <time.h> |
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| 31 | #include <signal.h> |
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| 32 | #include <sys/stat.h> |
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| 33 | #include <sys/ioctl.h> |
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| 34 | #include <sys/socket.h> |
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| 35 | #include <linux/types.h> |
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| 36 | #include <linux/watchdog.h> |
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| 37 | |
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| 38 | #include "ucix.h" |
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| 39 | #include "wireless.22.h" |
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| 40 | |
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| 41 | |
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| 42 | /* Check interval */ |
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| 43 | #define INTERVAL 30 |
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| 44 | |
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| 45 | /* Hysteresis */ |
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| 46 | #define HYSTERESIS 3 |
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| 47 | |
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| 48 | /* How to call myself in the logs */ |
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| 49 | #define SYSLOG_IDENT "Freifunk Watchdog" |
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| 50 | |
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| 51 | /* Wifi error action */ |
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| 52 | #define WIFI_ACTION "/sbin/wifi", "/sbin/wifi" |
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| 53 | |
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| 54 | /* Crond error action */ |
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| 55 | #define CRON_ACTION "/etc/init.d/cron", "/etc/init.d/cron", "restart" |
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| 56 | |
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| 57 | /* SSHd error action */ |
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| 58 | #define SSHD_ACTION "/etc/init.d/dropbear", "/etc/init.d/dropbear", "restart" |
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| 59 | |
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| 60 | /* Watchdog device */ |
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| 61 | #define WATCH_DEVICE "/dev/watchdog" |
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| 62 | #define WATCH_SHUTDOWN 'V' |
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| 63 | #define WATCH_KEEPALIVE '\0' |
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| 64 | |
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| 65 | /* System load error action and treshold */ |
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| 66 | #define LOAD_TRESHOLD 5.00 |
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| 67 | #define LOAD_ACTION "/sbin/reboot" |
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| 68 | |
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| 69 | /* Fallback binary name (passed by makefile) */ |
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| 70 | #ifndef BINARY |
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| 71 | #define BINARY "ffwatchd" |
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| 72 | #endif |
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| 73 | |
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| 74 | |
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| 75 | /* ifname/bssid/channel tuples */ |
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| 76 | struct wifi_tuple { |
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| 77 | char ifname[16]; |
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| 78 | char bssid[18]; |
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| 79 | int channel; |
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| 80 | struct wifi_tuple *next; |
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| 81 | }; |
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| 82 | |
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| 83 | /* structure to hold tuple-list and uci context during iteration */ |
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| 84 | struct uci_itr_ctx { |
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| 85 | struct wifi_tuple *list; |
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| 86 | struct uci_context *ctx; |
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| 87 | }; |
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| 88 | |
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| 89 | typedef struct wifi_tuple wifi_tuple_t; |
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| 90 | |
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| 91 | |
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| 92 | /* ioctl() helper (stolen from iwlib) */ |
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| 93 | static inline int |
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| 94 | iw_ioctl(int skfd, /* Socket to the kernel */ |
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| 95 | const char * ifname, /* Device name */ |
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| 96 | int request, /* WE ID */ |
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| 97 | struct iwreq * pwrq) /* Fixed part of the request */ |
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| 98 | { |
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| 99 | /* Set device name */ |
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| 100 | strncpy(pwrq->ifr_ifrn.ifrn_name, ifname, 16); |
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| 101 | |
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| 102 | /* Do the request */ |
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| 103 | return(ioctl(skfd, request, pwrq)); |
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| 104 | } |
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| 105 | |
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| 106 | /* fork() & execl() helper */ |
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| 107 | #define EXEC(x) \ |
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| 108 | do { \ |
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| 109 | switch(fork()) \ |
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| 110 | { \ |
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| 111 | case -1: \ |
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| 112 | syslog(LOG_CRIT, "Unable to fork child: %s", \ |
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| 113 | strerror(errno)); \ |
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| 114 | \ |
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| 115 | break; \ |
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| 116 | \ |
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| 117 | case 0: \ |
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| 118 | execl(x, NULL); \ |
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| 119 | syslog(LOG_CRIT, "Unable to execute action: %s", \ |
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| 120 | strerror(errno)); \ |
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| 121 | \ |
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| 122 | return 1; \ |
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| 123 | } \ |
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| 124 | } while(0) |
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| 125 | |
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