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#!/bin/sh
# travelmate, a wlan connection manager for travel router
# written by Dirk Brenken (dev@brenken.org)
# This is free software, licensed under the GNU General Public License v3.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# prepare environment
#
LC_ALL=C
PATH="/usr/sbin:/usr/bin:/sbin:/bin"
trm_ver="0.3.1"
trm_enabled=1
trm_debug=0
trm_maxwait=20
trm_maxretry=3
trm_iw=1
f_envload()
{
# source required system libraries
#
if [ -r "/lib/functions.sh" ]
then
. "/lib/functions.sh"
else
f_log "error" "required system library not found"
fi
# load uci config and check 'enabled' option
#
option_cb()
{
local option="${1}"
local value="${2}"
eval "${option}=\"${value}\""
}
config_load travelmate
if [ ${trm_enabled} -ne 1 ]
then
f_log "info " "status ::: travelmate is currently disabled, please set 'trm_enabled' to '1' to use this service"
exit 0
fi
# check for preferred wireless tool
#
if [ ${trm_iw} -eq 1 ]
then
trm_scanner="$(which iw)"
else
trm_scanner="$(which iwinfo)"
fi
if [ -z "${trm_scanner}" ]
then
f_log "error" "status ::: no wireless tool for wlan scanning found, please install 'iw' or 'iwinfo'"
fi
}
# function to bring down all STA interfaces
#
f_prepare()
{
local config="${1}"
local mode="$(uci -q get wireless."${config}".mode)"
local network="$(uci -q get wireless."${config}".network)"
local disabled="$(uci -q get wireless."${config}".disabled)"
if [ "${mode}" = "sta" ] && [ -n "${network}" ]
then
trm_stalist="${trm_stalist} ${config}_${network}"
if [ -z "${disabled}" ] || [ "${disabled}" = "0" ]
then
uci -q set wireless."${config}".disabled=1
f_log "debug" "prepare ::: config: ${config}, interface: ${network}"
fi
fi
}
f_check()
{
local ifname cnt=1 mode="${1}"
trm_ifstatus="false"
while [ ${cnt} -le ${trm_maxwait} ]
do
ifname="$(ubus -S call network.wireless status | jsonfilter -l 1 -e "@.*.interfaces[@.config.mode=\"${mode}\"].ifname")"
if [ "${mode}" = "sta" ]
then
trm_ifstatus="$(ubus -S call network.interface dump | jsonfilter -e "@.interface[@.device=\"${ifname}\"].up")"
else
trm_ifstatus="$(ubus -S call network.wireless status | jsonfilter -l1 -e '@.*.up')"
fi
if [ "${trm_ifstatus}" = "true" ]
then
break
fi
cnt=$((cnt+1))
sleep 1
done
f_log "debug" "check ::: name: ${ifname}, status: ${trm_ifstatus}, count: ${cnt}"
}
# function to write to syslog
#
f_log()
{
local class="${1}"
local log_msg="${2}"
if [ -n "${log_msg}" ] && ([ "${class}" != "debug" ] || [ ${trm_debug} -eq 1 ])
then
logger -t "travelmate-[${trm_ver}] ${class}" "${log_msg}"
if [ "${class}" = "error" ]
then
exit 255
fi
fi
}
f_main()
{
local ap_list ssid_list config network ssid cnt=1
f_check "sta"
if [ "${trm_ifstatus}" != "true" ]
then
config_load wireless
config_foreach f_prepare wifi-iface
if [ -n "$(uci -q changes wireless)" ]
then
uci -q commit wireless
ubus call network reload
fi
f_check "ap"
ap_list="$(ubus -S call network.wireless status | jsonfilter -e '@.*.interfaces[@.config.mode="ap"].ifname')"
f_log "debug" "main ::: ap-list: ${ap_list}, sta-list: ${trm_stalist}"
if [ -z "${ap_list}" ] || [ -z "${trm_stalist}" ]
then
f_log "error" "main ::: no usable AP/STA configuration found"
fi
for ap in ${ap_list}
do
while [ ${cnt} -le ${trm_maxretry} ]
do
if [ ${trm_iw} -eq 1 ]
then
ssid_list="$(${trm_scanner} dev "${ap}" scan 2>/dev/null | \
awk '/SSID: /{if(!seen[$0]++){printf "\"";for(i=2; i<=NF; i++)if(i==2)printf $i;else printf " "$i;printf "\" "}}')"
else
ssid_list="$(${trm_scanner} "${ap}" scan | \
awk '/ESSID: ".*"/{ORS=" ";if (!seen[$0]++) for(i=2; i<=NF; i++) print $i}')"
fi
f_log "debug" "main ::: scan-tool: ${trm_scanner}, ssidlist: ${ssid_list}"
if [ -n "${ssid_list}" ]
then
for sta in ${trm_stalist}
do
config="${sta%%_*}"
network="${sta##*_}"
ssid="\"$(uci -q get wireless."${config}".ssid)\""
if [ -n "$(printf "${ssid_list}" | grep -Fo "${ssid}")" ]
then
uci -q set wireless."${config}".disabled=0
uci -q commit wireless
ubus call network reload
f_check "sta"
if [ "${trm_ifstatus}" = "true" ]
then
f_log "info " "main ::: wwan interface connected to uplink ${ssid} (${cnt}/${trm_maxretry})"
return 0
else
uci -q set wireless."${config}".disabled=1
uci -q commit wireless
ubus call network reload
f_log "info " "main ::: wwan interface can't connect to uplink ${ssid} (${cnt}/${trm_maxretry})"
fi
fi
done
fi
cnt=$((cnt+1))
sleep 5
done
done
f_log "info " "main ::: no wwan uplink found"
fi
}
if [ "${trm_procd}" = "true" ]
then
f_envload
f_main
fi
exit 0