--- /dev/null
+/*
+ * 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 "watchdog.h"
+
+/* Get BSSID of given interface */
+static int iw_get_bssid(int iwfd, const char *ifname, char *bssid)
+{
+ struct iwreq iwrq;
+
+ if( iw_ioctl(iwfd, ifname, SIOCGIWAP, &iwrq) >= 0 )
+ {
+ unsigned char *addr = (unsigned char *)iwrq.u.ap_addr.sa_data;
+
+ sprintf(bssid, "%02X:%02X:%02X:%02X:%02X:%02X",
+ addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
+
+ return 0;
+ }
+
+ return -1;
+}
+
+/* Get channel of given interface */
+static int iw_get_channel(int iwfd, const char *ifname, int *channel)
+{
+ int i;
+ char buffer[sizeof(struct iw_range)];
+ double cur_freq, cmp_freq;
+ struct iwreq iwrq;
+ struct iw_range *range;
+
+ memset(buffer, 0, sizeof(buffer));
+
+ iwrq.u.data.pointer = (char *)buffer;
+ iwrq.u.data.length = sizeof(buffer);
+ iwrq.u.data.flags = 0;
+
+ if( iw_ioctl(iwfd, ifname, SIOCGIWRANGE, &iwrq) < 0)
+ {
+ *channel = -1;
+ return -1;
+ }
+
+ range = (struct iw_range *)buffer;
+
+ if( iw_ioctl(iwfd, ifname, SIOCGIWFREQ, &iwrq) >= 0 )
+ {
+ cur_freq = ((double)iwrq.u.freq.m) * pow(10, iwrq.u.freq.e);
+ if( cur_freq < 1000.00 )
+ {
+ *channel = (int)cur_freq;
+ return 0;
+ }
+
+ for(i = 0; i < range->num_frequency; i++)
+ {
+ cmp_freq = ((double)range->freq[i].m) * pow(10, range->freq[i].e);
+ if( cmp_freq == cur_freq )
+ {
+ *channel = (int)range->freq[i].i;
+ return 0;
+ }
+ }
+ }
+
+ *channel = -1;
+ return -1;
+}
+
+/* Get the (first) pid of given process name */
+static int find_process(const char *name)
+{
+ int pid = -1;
+ int file;
+ char buffer[128];
+ char cmpname[128];
+ DIR *dir;
+ struct dirent *entry;
+
+ if( (dir = opendir("/proc")) != NULL )
+ {
+ snprintf(cmpname, sizeof(cmpname), "Name:\t%s\n", name);
+
+ while( (entry = readdir(dir)) != NULL )
+ {
+ if( !strcmp(entry->d_name, "..") || !isdigit(*entry->d_name) )
+ continue;
+
+ sprintf(buffer, "/proc/%s/status", entry->d_name);
+ if( (file = open(buffer, O_RDONLY)) > -1 )
+ {
+ read(file, buffer, sizeof(buffer));
+ close(file);
+
+ if( strstr(buffer, cmpname) == buffer )
+ {
+ pid = atoi(entry->d_name);
+ break;
+ }
+ }
+ }
+
+ closedir(dir);
+ return pid;
+ }
+
+ syslog(LOG_CRIT, "Unable to open /proc: %s",
+ strerror(errno));
+
+ return -1;
+}
+
+/* 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);
+ 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;
+}
+
+/* Add tuple */
+static void load_wifi_uci_add_iface(const char *section, struct uci_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, "ifname");
+ if(ucitmp)
+ {
+ 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, "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);
+ }
+ }
+}
+
+/* Load config */
+static wifi_tuple_t * load_wifi_uci(wifi_tuple_t *ifs, time_t *modtime)
+{
+ struct uci_context *ctx;
+ struct uci_itr_ctx itr;
+ wifi_tuple_t *cur, *next;
+
+ if( check_uci_update("wireless", modtime) )
+ {
+ syslog(LOG_INFO, "Config changed, reloading");
+
+ if( (ctx = ucix_init("wireless")) != NULL )
+ {
+ if( ifs != NULL )
+ {
+ for(cur = ifs; cur; cur = next)
+ {
+ next = cur->next;
+ free(cur);
+ }
+ }
+
+ itr.list = NULL;
+ itr.ctx = ctx;
+
+ ucix_for_each_section_type(ctx, "wireless", "wifi-iface",
+ (void *)load_wifi_uci_add_iface, &itr);
+
+ return itr.list;
+ }
+ }
+
+ return ifs;
+}
+
+/* Daemon implementation */
+static int do_daemon(void)
+{
+ int iwfd;
+ int channel;
+ char bssid[18];
+
+ wifi_tuple_t *ifs = NULL, *curif;
+ time_t modtime = 0;
+
+ int restart_wifi = 0;
+ int restart_cron = 0;
+
+ openlog(SYSLOG_IDENT, 0, LOG_DAEMON);
+ //daemon(1, 1);
+
+ if( (iwfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1 )
+ {
+ perror("Can not open wireless control socket");
+ return 1;
+ }
+
+ while( 1 )
+ {
+ if( (ifs = load_wifi_uci(ifs, &modtime)) == NULL )
+ {
+ printf("Can not load wireless uci. File corrupt?\n");
+ return 1;
+ }
+
+ /* Check crond */
+ if( find_process("crond") < 0 )
+ {
+ syslog(LOG_WARNING, "The crond process died, restarting");
+ restart_cron++;
+ }
+
+ /* 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 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 */
+ if( channel != curif->channel )
+ {
+ syslog(LOG_WARNING, "Channel mismatch on %s: current=%d wanted=%d",
+ curif->ifname, channel, curif->channel);
+
+ restart_wifi++;
+ }
+ }
+ else
+ {
+ syslog(LOG_WARNING, "Requested interface %s not present", curif->ifname);
+ }
+ }
+
+
+ /* Wifi restart required? */
+ if( restart_wifi > 0 )
+ {
+ restart_wifi = 0;
+ EXEC(WIFI_ACTION);
+ }
+
+ /* Cron restart required? */
+ if( restart_cron > 0 )
+ {
+ restart_cron = 0;
+ EXEC(CRON_ACTION);
+ }
+
+ sleep(INTERVAL);
+ }
+
+ closelog();
+ return 0;
+}
+
+
+int main(int argc, char *argv[])
+{
+ /* Check if watchdog is running ... */
+ if( (argc > 1) && (strcmp(argv[1], "running") == 0) )
+ {
+ return (find_process(BINARY) >= 0);
+ }
+
+ /* Start daemon */
+ return do_daemon();
+}
projects / project / luci.git / blobdiff