Controle l'etat de la connectivité réseau en temps réel.

files/usr/share/watch_net/watch_net.sh

+#!/bin/sh
+
+# Watch the different broadcast networks and hide them if they
+# are considered unusable.
+# A new entry in wifi-iface sections of wireless config has been added
+# test_connect can contain a shell command giving the state of the
+# network:
+# for a bridged wifi network (without IP on APs side), this could be:
+# option 'test_connect' 'arping -I br-$(net) $(routeur_ip) -c 4'
+# for wpa2 networks, test_connect can be ommited and connectivity
+# to the radius serveur will be checked.
+# In case of lack of connectivity, the corresponding SSID won't be
+# broadcast anymore, preveting new clients from connecting.
+# Currently, the scripts uses SIGHUP signal to hostapd process which
+# ends up in loosing anyway all associated clients on the >>radio<<
+# (hope this will be fixed)
+
+CONF=/var/run/hostapd-phy0.conf
+PID=/var/run/wifi-phy0.pid
+CTRL=/var/run/hostapd-phy0
+
+. /lib/functions.sh
+
+# Numbered of changed statuses
+changed=0
+
+# $1 = interface
+# $2 = variable name
+hostapd_get_config() {
+   hostapd_cli -p$CTRL -i $1 get_config | sed "s/^$2=//; t; d"
+}
+
+# $1 = interface
+# $2 = variable name
+# $3 = value
+hostapd_set_config() {
+   hostapd_cli -p$CTRL -i $1 set $2 $3
+}
+
+# $1 = ssid
+# $2 = value ( 0 = Ok, 1 or 2 = hide)
+set_ignore_broadcast_ssid() {
+  echo "changed $1's state to $2"
+  for iface in `ls $CTRL/`; do
+    [ "`hostapd_get_config $iface ssid`" = "$1" ] || continue
+    [ "`hostapd_get_config $iface ignore_broadcast_ssid`" != "$2" ] || continue
+    hostapd_set_config $iface ignore_broadcast_ssid $2
+    changed=$(($changed+1))
+    echo "changed"
+  done
+}
+
+check_ssid() {
+  local iface="$1"
+  config_get ssid $iface ssid default
+  config_get test_connect $iface test_connect
+  config_get disabled $iface disabled 0
+  [ $disabled -ne 0 ] && {
+    echo "$ssid: skipped (disabled)"
+    return
+  }
+  [ -z "$test_connect" ] && {
+    config_get server $iface server
+    [ -z "$server" ] && {
+       test_connect="true"
+    } || {
+       test_connect="ping -c 4 $server"
+    }
+  }
+  echo "$ssid: $test_connect ..."
+  $test_connect &> /dev/null
+  [ 0 -eq $? ] && set_ignore_broadcast_ssid "$ssid" 0 \
+               || set_ignore_broadcast_ssid "$ssid" 1
+
+}
+
+# TODO: find out why this causes all clients to be disconnected on the radio
+# maybe we should try reload the configuration using "hostapd_cli reconfigure"
+# however we should figure out first what happened to that command
+# (http://lists.shmoo.com/pipermail/hostap/2011-July/023520.html ?)
+reload_hostapd() {
+  echo "reload config"
+  kill -1 `cat $PID`
+}
+
+config_load wireless
+cp $CONF $CONF.bak
+config_foreach check_ssid wifi-iface
+
+exit $changed

[Gabriel Detraz]

Coupe la diffusion des ssid si la connectivité est perdue, pour éviter d'induire en erreur les machines. Surveille l'etat de la connectivité.